Spark erosion tool and electrode for a spark erosion tool

专利摘要:
A spark erosion tool (101, 102) is specified, which has an electrode (301, 302) arranged on a tool longitudinal axis (2) and an electrode holder aligned along the tool longitudinal axis (2) and connected to the electrode (301, 302) (401..417). The electrode holder (401..417) comprises means for moving the electrode (301, 302) relative to the electrode holder (401..417) and means (6, 11, 12, 13, 15) for applying a transverse to the tool longitudinal axis (2) acting pressure in the region of an imaginary, in the tool longitudinal axis (2) extending hose (7) having a substantially the electrode (301, 302) corresponding cross-section. Furthermore, a method is given how the spark erosion tool (101, 102) can be used. In addition, an electrode (302) for a spark erosion tool is specified with a cylindrical surface or a spherical surface, in which at least one with a bore (36) connected groove (35) is arranged. Finally, there is provided a method of making an alternate bore (48) in a drill string member (47) that connects two straight purge holes (39, 41) and which is arcuately made by spark erosion.
公开号:AT512987A1
申请号:T640/2012
申请日:2012-06-04
公开日:2013-12-15
发明作者:
申请人:Schoeller Bleckmann Oilfield Technology Gmbh；
IPC主号:

专利说明:

9 9 9 99 9 9 9 9 9 99 • 9 9 9 9 9 9 9 9 9 9 9 9 9 99 99 999
The invention relates to a spark erosion tool comprising an electrode arranged on a tool longitudinal axis and an electrode holder aligned along the tool longitudinal axis and arranged thereon and connected to the electrode. The electrode holder has means for moving the electrode relative to the electrode holder. Furthermore, the invention relates to an electrode for a spark erosion tool and a method for producing a spark erosion hole using a spark erosion tool of the type mentioned. Moreover, the invention also relates to a use of such a spark erosion tool and a method for producing a replacement hole in a Bohrstrangteil which connects two straight flushing holes with parallel axes and in particular extending in one axis Spülbohrungen
Spark erosion tools of the type mentioned are known in principle. For example, JP 2001-205523 A shows a spark erosion tool with an electrode which is attached to a helical spring-like carrier, or on a carrier which consists of several mutually articulated individual segments. With the help of this carrier, the electrode can be pushed into a wellbore and also deflected therein to produce arcuate holes can.
Furthermore, JP 2003-136343 A shows another spark erosion tool with an electrode, which is attached to a carrier, which consists of several mutually articulated connected individual segments. With the help of this tool arcuate and in particular spiral holes can be made. N2011 / 15900 • · · · * * φ • φ φ • φ φ -2- * * Μ • * Φ ΦΦΦ Φ * • * Φ * • • ΦΦ
In addition, WO 00/54918 A1 shows an EDM tool having an electrode affixed to a support made of a flexible material having a plurality of sipes.
Finally, DE 129 3 001 B shows a spark erosion tool with an electrode which is attached to a blind-like or roller shutter-like carrier. With this tool, for example, slots can be made with a Weil-shaped course.
Although the known spark erosion tool allow the production of arcuate recesses, but they are each adapted to a specific application. Furthermore, the known spark erosion tools are only replaceable for comparatively shallow bores.
The object of the invention is therefore to provide an improved EDM tool, in particular one that can be used universally and in particular for deep holes. The object of the invention is furthermore to specify an improved method for producing a spark-eroded hole. In particular, the method should be universally applicable and allow the production of deep holes.
The object of the invention is achieved with an EDM tool of the type mentioned above in which the electrode holder comprises means for applying a pressure acting transversely to the longitudinal axis of the tool in the region of an imaginary hose extending in the longitudinal axis of the tool with a cross section substantially corresponding to the electrode.
The object of the invention is further achieved with a method for producing a spark eroded hole with the aid of a longitudinal axis arranged on an electrode and a longitudinal axis along the tool aligned and arranged thereon and connected to the electrode Elektrodenhai-ter, comprising the steps: a) fixing of the electrode holder by applying a transversely to the tool longitudinal axis acting pressure in an extending in the tool longitudinal opening extending, which corresponds to a substantially corresponding to the electrode cross-section d) switching off the erosion voltage e) moving the electrode opposite to the electrode holder away from the processing front, f) releasing the electrode holder by lowering said, transversely to the electrode holder, b) switching on the erosion voltage c) moving the electrode opposite the electrode holder to a processing front; Tool longitudinal axis acting g) moving the electrode holder in the direction of the machining front and repeating steps a) to g).
In contrast to known methods for producing a spark-eroded hole, in the invention an electrode-like (in the borehole) is fixed and then the electrode is moved further from this reference point. In this way, the design of the bore can be very flexibly influenced and the bore can be produced with only small tolerances. In particular, the course of the bore can be easily corrected if the tool should "run" in an unexpected manner. Overall, the vorgestelite spark erosion tool so that much more universally replaceable than known spark erosion tools, especially because with the presented spark erosion tool in principle very low-lying holes can be made with any spatial course. Finally, for the sake of completeness, it will be noted that steps e) and g) in the above-mentioned method can also be carried out simultaneously and do not necessarily have to be carried out consecutively.
An advantageous variant of the method for producing a spark-eroded hole is provided if before step a) an auxiliary body with an opening extending in the tool longitudinal opening, which has a substantially corresponding cross-section of the electrode, fixed in the region of the hole to be produced and the electrode holder in the N2011 / 15900 -4- • «* *» »· ♦» * • · · · ♦ * * · Μ ♦ · ··· • * * · «« «· # · · * • · · · T • · · sender electrode is positioned. In this way, the spark erosion tool can be aligned before the actual drilling begins.
It is particularly advantageous if the machining contour produced is subsequently further processed or finished by spark-erosion by means of any machining or non-cutting machining process. As a result, for example, microcracks, which may arise in the spark erosion, eliminated and a particularly high surface quality can be achieved.
The imaginary hose (also thought pipe or jacket of a pipe) mentioned in the spark erosion tool is coincident with the hole made in the workpiece by the electrode when the spark erosion tool is used. Alternatively or additionally, the object of the invention is therefore also achieved with a spark erosion tool of the type mentioned, in which the electrode holder comprises means for applying a pressure acting transversely to the tool longitudinal axis pressure on the wall of a hole made by the electrode.
In general, spark erosion refers to making a "bore", although as a rule, no rotating tool is used and even though the material is not machined during removal. In the context of the invention, the terms "hole" and "hole" are therefore used synonymously. It is further noted that the bore does not necessarily have a circular cross-section during spark erosion. For example, the bore may also have polygonal or elliptical cross-section. The above-mentioned imaginary hose / the imaginary pipe is then accordingly a profile hose / a profile pipe.
Another aspect of the object of the invention is to provide an electrode for a spark erosion tool, in which the pivoting thereof about a transversely arranged to the tool longitudinal axis axis of rotation and thus a change in the erosion can be done particularly easily and also a high material removal is possible. N2011 / 15900 ················································································································································································· g ·· 99 999 9 ·· 9 »
This aspect of the object is achieved by an electrode for a spark erosion tool, in particular for a spark erosion tool of the aforementioned kind or as a component thereof, comprising: an machining front facing portion having a cylinder surface or a ball surface, at least one disposed in this portion Groove, which extends from a central region of the section to the edge thereof and at least one bore, which connects a side facing away from the processing front of the electrode with the at least one groove.
In general, an electrode having a spherical portion can be universally used, since it can be pivoted about any axis. An electrode having a cylindrical portion is preferably used when it can be pivoted only about a rotation axis, said rotation axis and the axis of the cylinder are aligned or identical. Due to the said measures, the pivoting of the electrode is facilitated by a transverse axis to the tool axis of rotation. In addition, the removed material can be removed with the aid of a fluid supplied via said holes and flowing through the groove, whereby a high material removal is made possible.
It is also advantageous in the case of an electrode if the radius of the cylindrical or spherical section is less than or equal to the distance between the axis of rotation of the electrode and the surface of the cylindrical or spherical section. Upon pivoting, the electrode slides along an opening already made in the workpiece, ie along its machining front. If the electrode is displaceable relative to the pivot point along the tool longitudinal axis, the radius of the cylindrical or spherical section is preferably less than or equal to the smallest distance between the axis of rotation of the electrode and the surface of the cylindrical or spherical section.
It is also advantageous if the cylindrical or spherical section of the electrode comprises, in its edge region, a rounding reaching at least as far as the boundary of the machining front, which radius has a radius which is small enough to be n2011 / 15900 -6- " • φ -6- " • φ Φ Φ tt «· ner is the radius of the cylindrical or spherical section. In this way, the production of arcuate holes without Querriefen or Querriefen only small depth is possible.
Finally, another aspect of the object of the invention is to provide an advantageous use of a spark erosion tool. In particular, an advantageous method for producing an alternative bore in a drill string part is to be specified, which connects two straight flushing holes with parallel axes and in particular running in one axis Spülbohrungen. Among other disadvantages to be avoided in terms of mechanical and hydraulic properties of the drill string part, as they result from the prior art methods produced.
This aspect of the object is achieved by a method of making an alternate bore in a drill string part connecting two straight parallel axis drilling bores and, more particularly, one-axis scavenging bores in which the alternate bore is arcuately machined by spark erosion.
The mechanical and hydraulic properties of the drill string part are thus improved overall.
Such a replacement bore can be produced particularly well by using a spark erosion tool of the abovementioned type, since a drill string part is usually a few meters long and the flushing holes protrude correspondingly far into the drill string part. By an electrode holder, it is namely possible to securely fix the EDM tool deep inside a Bohrstrangteils and to move the electrode within a narrow tolerance range.
Further advantageous embodiments and modifications of the invention will become apparent from the dependent claims and from the description in conjunction with the figures.
It is advantageous if the spark erosion tool comprises means for varying a cross section of the electrode holder transversely to the tool longitudinal axis. In this way, different forms and / or sizes of the hole made by the electrode when fixing the electrode holder are compensated.
It is advantageous in this context if the means for varying a cross section of the electrode holder and for applying a pressure acting transversely to the tool longitudinal axis are formed by extendable and / or swingable clamping elements / claws. In this way, an accurate positioning within the bore is possible. In particular, it is conceivable that the clamping elements / claws are individually controlled for this purpose.
It is also advantageous in this context if a housing of the electrode holder is elastic and the clamping elements / claws act through this housing. In this way, the clamping elements / claws can be well protected against contamination.
It is furthermore advantageous if the means for varying a cross section of the electrode holder and for applying a pressure acting transversely to the tool longitudinal axis are formed by a pneumatically or hydraulically actuated bellows / sulfur body. As a result, the clamping can take place over a comparatively large area, as a result of which surface imperfections of the bore, such as grooves and the like, do not have a great influence on the clamping effect.
It is particularly advantageous if the electrode holder comprises means for its movement. This makes it possible to move the electrode holder within a bore without the need for an outwardly guided linkage would be necessary.
It is advantageous in this context if the means of locomotion are formed by driven wheels. This allows the electrode holder to be moved well in the bore. With appropriate design of the wheels, these can also be used as a means for applying a transversely acting to the tool longitudinal axis N2011 / 15900
• • • • • • • • • • • • • • • • • • • • • '*' • «* • * • * • • M 9 ·« · · · · # M
Pressure on the wall of a hole made by the electrode, so that they then provide a double benefit.
It is furthermore advantageous if the electrode holder comprises at least two segments which are movable relative to one another in the tool longitudinal axis and each have means for applying a pressure acting transversely to the tool longitudinal axis or for varying a cross section of the electrode holder. In this variant, the electrode holder thus has a front and a rear segment, which are alternately fixed in the bore made by the electrode. Between alternate fixation, the distance between the two segments is increased or decreased so that the electrode holder can move in the bore. It is advantageous if the EDM tool comprises a flexible, rod-shaped or tubular feed body aligned along the tool longitudinal axis, which is connected to the electrode holder. In this way, the electrode holder can be moved within the bore, without this would have to have its own drive. The structure of the EDM tool is thus particularly simple.
It is advantageous in this context if the feed body comprises a plurality of rigid and along the tool longitudinal axis arranged segments which are mutually movably connected. As a result, the feed body can be built robust, that is, with segments of a durable and hard material, but still remains mobile.
It is advantageous if the segments are rotatably connected to one another via axes of rotation aligned transversely to the tool longitudinal axis, in particular if all axes of rotation are normal to the tool longitudinal axis and parallel to each other or all axes of rotation are aligned normal to the tool longitudinal axis, wherein two adjacent axes of rotation by an angle α are twisted. In the first variant of the feed body can therefore be moved in a plane. This is thus suitable for holes that run in a plane. The second variant is also suitable for spatial N2011 / 15900 ····· · · · · · »» »» »* ·· ·
running holes. In particular, the axes of rotation can be rotated by 90 °, so that the feed body is composed of a series of interconnected gimbal segments. If the angle α is less than 90 °, then such a feed body can be used in particular for the production of helical-shaped bores.
It is advantageous if the feed body along the tool longitudinal axis has a constant length. In this way, the electrode holder attached to the advancing body or also the electrode can be moved well in the borehole, since a displacement of the advancing body essentially corresponds to a displacement of the electrode holder or also of the electrode. In addition, it is favorable if the electrode is movable relative to the electrode holder in the tool longitudinal axis and / or transversely thereto. As a result, on the one hand a feed movement of the electrode is possible, but on the other hand, a movement to deflect the course of the bore.
It is also advantageous if the electrode is rotatable relative to the electrode holder, wherein the axis of rotation is aligned transversely to the tool longitudinal axis. In this way, the electrode can be swung out of the axis of the {already existing) bore in order to achieve an arcuate course of the further bore. It is also advantageous if the electrode is rotatable relative to the electrode holder, wherein the axis of rotation is aligned parallel to the tool longitudinal axis or coincides with this. In this way, for example, holes can be made with non-circular cross-section, the cross-sectional shape of which rotates helically along the longitudinal axis of the bore. In addition, it is also possible to rotate a pivoting mechanism for the electrode in a predeterminable direction in order to deflect the bore in the desired manner. Finally, it is also advantageous to rotate the electrode about an axis of rotation aligned or coincident with the longitudinal axis of the tool when the electrode has grooves for rinsing on the side facing the machining front. N2011 / 15900 -10- -10- ♦ · • ···
. Due to said rotation, the material can be removed evenly despite the grooves in the electrode. It is also advantageous if the means for moving the electrode relative to the electrode holder by at least one actuator connected to the electrode from the group: pneumatic actuator, hydraulic actuator, piezo actuator, electromechanical actuator - each designed as a linear or rotary motor - are formed , As a result, proven and proven means for moving the electrode are available. The spark erosion tool can thus be implemented with relatively little effort into reality.
It is advantageous if the means for moving the electrode relative to the electrode holder are formed by cables, which are connected to the electrode. This makes it possible to control the electrode with little technical effort outside the borehole. It is advantageous if the spark erosion tool comprises arranged in the region of the tool longitudinal axis and connected to the electrode holder trailing cables, which serves the electrical supply of the electrode and / or the energetic supply of the electrode holder and / or the transmission of control signals to the electrode holder. In particular, the trailing cables can be formed by an electric cable and by hoses of a pneumatic or hydraulic system. In this way, the energy required to operate the spark erosion tool can be easily conveyed to the electrode holder. In addition, an influence on the drilling process from the outside is possible if the lines also serve to transmit control signals to the electrode holder.
Finally, it is particularly advantageous if a housing of the electrode holder is flexible and an internal structure thereof comprises a plurality of rigid segments which are movable relative to one another and in which the means for applying a pressure acting transversely to the tool longitudinal axis and / or the means for moving the Electrode opposite to the electrode holder and / or a control of said means, in particular an electronic control arranged N2011 / 15900 -11 - φφφφ φφφ φ φ φ φφφφ φ φφ · φφφ «φ φφ φ φφφ φφ φφφφ φφ φφφ φ φφ φφ. In this way, the electrode holder can be particularly well adapted to a course of the bore. Nevertheless, the use of (usually) rigid standard components for the internal structure is possible. For example, these include drive motors and printed circuit boards with control and / or communication units arranged thereon. Instead of the hose-like housing, this can also be formed by a plurality of mutually articulated, rigid segments. Since the boundaries to the feed body are fluent here, a strict subdivision into the feed body and electrode holder is not always justified. It is therefore also conceivable that these form more or less a structural unit.
For a better understanding of the invention, this will be explained in more detail with reference to the following figures. Show it
Figure 1 is a schematic representation of a spark erosion tool with extendable plates in the electrode holder.
FIG. 2 is a schematic representation of an electrode holder with swiveling claws; FIG.
3 shows a schematic representation of an electrode holder with a bellows / swelling body for fixing the electrode holder;
Fig. 4 as shown in Figure 3 only with bellows / Schwellkörper arranged rearward.
Fig. 5 is a schematic representation of an electrode holder with driven wheels;
Fig. 6 as shown in Figure 5 only with front and rear wheels.
7 is a schematic representation of an electrode holder with two mutually movable and independently fixable segments.
Fig. 8 as shown in Figure 7 only with a Spindeiantrieb instead of the hydraulic / pneumatic cylinder. N2011 / 15900 -12- ···· * ··· · • ··· * ·· ♦ »I ···· * ·· * * · ···· ·· · t ······· ··· ·· ··
9 shows a schematic illustration of an electrode holder with a flexible housing and a segmented internal structure;
Fig. 10 is a schematic representation of an electrode holder with clamping elements / claws, which are arranged under an elastic housing;
Fig. 11 shows an example of a feed body formed by a flexible tube;
12 shows a further example of a feed body which is formed by a plurality of segments movably connected to one another;
13 shows examples of the arrangement of the axes of rotation of the feed body shown in FIG. 12;
14 shows a schematic illustration of an electrode holder with a serial kinematics for moving the electrode;
FIG. 15 shows a schematic illustration of an electrode holder with a parallel kinematics for moving the electrode; FIG.
FIG. 16, like FIG. 15, only with the electrode swung out; FIG.
Fig. 17 as Fig. 15 only with cables instead of hydraulic / Pneumatikzyiindern;
18 is a schematic representation of an electrode holder with a swiveling mechanism for a pivoting movement of the electrode in a plane;
Fig. 19 as Fig. 18 only extended with a rotary drive for the electrode;
Fig. 20 as Fig. 18 only extended with a linear feed for the electrode;
Fig. 21 as Fig. 20 only with cables instead of hydraulic / Pneumatikzylindem; N2011 / 15900 -13- • · • * # t
FIG. 22 shows a workpiece before machining with a spark erosion tool; FIG.
FIG. 23, like FIG. 22, only with the electrode of the EDM tool extended; FIG.
Fig. 24 as Fig. 23 only with further moved electrode holder;
FIG. 25, like FIG. 24, only with the electrode extended; FIG.
FIG. 26 shows the workpiece with the spark erosion tool deeply penetrated; FIG.
Fig. 27 shows an exemplary electrode in detail view and
FIG. 28 is an exemplary drill string member having an alternate bore made with a spark erosion tool. FIG.
By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and are to be transferred to the new situation mutatis mutandis when a change in position. Furthermore, individual features or combinations of features from the illustrated and described different embodiments may represent for themselves, inventive or inventive solutions.
1 schematically shows a first variant of a spark erosion tool 101 comprising an electrode 301 arranged on a tool longitudinal axis 2 and an electrode holder 401 aligned along the tool longitudinal axis 2 and connected to the electrode 301. The electrode holder 401 comprises in FIG 1, means (not shown) for moving the electrode 301 relative to the electrode holder 401. N2011 / 15900 -14- Φ φ * * * * # * · • · «· · · · · · · · · · · · · · · · «• ♦ ♦ φ · φ ····» · φφ · 1 · φ φφ ΦΦ
In principle, movements of the electrode 301 with respect to the electrode holder 401 in all six degrees of freedom are conceivable, that is movements in the x-y and z-axis as well as rotations about said axes. In Fig. 1, some of these possibilities are visualized with arrows.
The electrode holder 401 furthermore comprises means 6 for applying a pressure acting transversely to the tool longitudinal axis 2 in the region of an imaginary hose 7 extending in the longitudinal axis 2 of the tool with a cross-section substantially corresponding to the electrode 301. This imaginary hose 7 is shown in broken lines in FIG. Equivalent, the imaginary hose can also be understood as a thought pipe or jacket of a pipe. If the spark-erosion tool 101 is in operation, the said tube 7 coincides with the bore made by the electrode 301 (see also, for example, FIG. 26).
The means for applying a pressure acting transversely to the tool longitudinal axis 2 are in this example concretely formed by plates 6, which are mounted in a base body 5, whereby a pneumatically or hydraulically actuated actuator is realized. If the pressure in the hollow chamber in the main body 5 is increased, the plates 6 are accordingly pressed outward. In addition, the plates 6 can also serve to vary the cross section of the electrode holder transversely to the tool longitudinal axis 2 by extending or retracting. In this way, tolerances of the hole produced by the electrode 301, or even bends thereof can be well compensated. For example, three plates 6 may be distributed by 120 ° offset over the circumference of the main body 5.
2 shows a further schematically illustrated variant of an electrode holder 402, in which the means for varying a cross section of the electrode holder 402 and for applying a pressure acting transversely to the tool longitudinal axis 2 are formed by swivellable claws 11. For the movement thereof, a motor 9 mounted in the main body 5 is activated, whereby the spindle nut 10 is axially displaced by the rotating spindle. With the help of levers N2011 / 15900 -15- • φ · · φ φ · · φ φ • · * · · «* · ·· φ * φ φ φ φ # · φ φ φφ φ φ φ φ φ φ φ * φ φ φ φ φ φ φ will transmit this movement to the claws 11, which can accordingly be pivoted in or out. For example, three claws 11 offset by 120 ° may be distributed over the circumference of the main body 5.
3 shows another variant of an electrode holder 403, in which the means for varying a cross section of the electrode holder 403 and applying a pressure acting transversely to the tool longitudinal axis 2 are formed by a pneumatically or hydraulically actuated bellows / cavernous body 12. This is made of an elastic material so that it bulges outwards when the pressure inside it is increased. In this way, the electrode holder 403 can be clamped in a bore.
FIG. 4 shows a variant of an electrode holder 404, which is very similar to the electrode holder 403. In contrast, the bellows / cavernous body 13 is now arranged in the rear region of the electrode holder 404. Of course, the bellows / swelling body 13 could also be arranged in the front region of the electrode holder 404. This also applies to other means for varying a cross section of the electrode holder and for applying a pressure acting transversely to the tool longitudinal axis 2, in particular also for the claws 11 shown in FIG. 1, which could also be arranged in the middle or front region of the electrode holder 402.
5 shows a schematically illustrated variant of an electrode holder 405, which comprises means for its movement (left in cross section, right in longitudinal section). Specifically, these means are formed by driven wheels 15 in the present example. These have a rubberized surface, in which a driven by a motor 9 spindle 14 engages or is pressed. As a result, upon rotation of the spindle 14, the wheels 15 are also set in rotation, whereby the electrode holder 405 can be moved back and forth in the bore. Due to the rubberized surface, the wheels 15 simultaneously serve as a means for applying a pressure acting transversely to the longitudinal axis of the tool 2. If the motor 9 is deactivated, the electrode holder 405 in N2011 / 15900 -16 · + ·· * Μ · · · I · The holes are locked because the wheels 15 are locked due to self-locking of the spindle 14 can not turn anymore. The wheels 15 thus provide multiple benefits.
FIG. 6 shows a variant of an electrode holder 406, which is very similar to the electrode holder 405. In contrast, the electrode holder 406 now includes wheels 15 at its front and rear ends.
7 now shows a schematically illustrated variant of an electrode holder 407, which comprises two segments which are movable relative to one another in the tool longitudinal axis 2 and each have means 12 for applying a pressure acting transversely to the tool longitudinal axis 2 or for varying a cross section of the electrode holder 407. Specifically, separately controllable bellows / cavernous bodies 12 are arranged on the two segments, which can be moved against each other by means of a hydraulic / pneumatic cylinder 16. For clamping the electrode holder 407, both bellows / cavernous bodies 12 are activated. For the same movement, one of the two bellows / cavernous body 12 is released and then moved the dissolved segment by means of the hydraulic / pneumatic cylinder 16 with respect to the still fixed segment. Then the previously dissolved segment is fixed and the other released and the two segments in turn shifted against each other. In order to move the electrode holder 407 in FIG. 7, for example, from right to left, the left segment is thus fixed and the right one is released. Then the distance between the two is reduced so that the right segment moves to the left. In a further step, the left segment is released and fixed the right, after which the distance between the segments is increased and also moves the left segment to the left. By repeating the steps indicated, the electrode holder 407 can be moved in the bore.
FIG. 8 shows a variant of an electrode holder 408, which is very similar to the electrode holder 407. Instead of the hydraulic / pneumatic cylinder 16 but now an electric motor 9 is provided with a spindle in a segment, which engages in the other segment. By activating the electric motor 9, N2011 / 18900 -17- -17- • ♦ • «ft * * • * * * * * • * '* *« Mt · ····· * * «« t «•« * • «t ·« • < 4 · ♦ the two segments are shifted against each other again. For the correct function, an anti-rotation device, not shown in FIG. 8, between the two segments is advantageous.
9 shows a schematically illustrated variant of an electrode holder 409 whose housing 18 is flexible and whose inner structure comprises a plurality of rigid segments 19, which are mutually movable. In these segments 19, for example, the means 6,11, 12, 13,15 for applying a pressure acting transversely to the tool longitudinal axis 2 and / or the means for moving the electrode 301 relative to the electrode holder 409 and / or a control of said means, in particular an electronic control, arranged.
As shown in FIG. 9, the individual segments 19 can be connected as required by flexible lines. In this way, the Eiekt-Rodenhalter 409 can adapt particularly well to a course of the bore. Nevertheless, the use of (usually) rigid standard components for the internal structure is possible. For example, these include drive motors and printed circuit boards with control and / or communication units arranged thereon.
FIG. 10 shows a further schematically illustrated variant of an electrode holder 410 whose housing 18 is likewise flexible. Inside two clamping rings 20 are arranged with hook-like projections and two actuating rings 21. By actuating the hydraulic / pneumatic cylinder 16, the two actuating rings 21 are pressed against the clamping rings 20, whereby the hook-like projections are pressed outwardly because of the bevel of the two rings 20, 21. This force is transmitted through the flexible housing 18, whereby the electrode holder 410 can be fixed in the hole made by the electrode. Of course, the mechanism shown with the two rings 20 and 21 is also applicable without flexible housing 18, when the hook-like extensions protrude, for example, through openings in a (rigid) housing. Conversely, the clamping mechanisms presented in FIGS. 1 and 2 are also applicable in connection with a flexible housing. N2011 / 15900 -18- -18- • φ • · φ · φ φ * »φ»
11 now shows a schematically illustrated variant of a feed body 802, at the left end of which a main body 5 of an electrode holder (not shown) is fastened, and which is essentially formed by an elastic hose 22. This can be made for example of flexible plastic. Equivalent, instead of the tube 22 but also a flexible rod can be used. Since the boundaries to the electrode holder are flowing here, in particular in connection with the variant shown in Fig. 9, a strict subdivision into the feed body and electrode holder is not always justified. It is therefore also conceivable that these form more or less a structural unit.
FIG. 12 shows a further schematically illustrated variant of a feed body 803, which comprises a plurality of rigid segments 23 arranged along the tool longitudinal axis 2 and which are movably connected to one another. Specifically, the segments 23 are rotatably connected to each other in this example via aligned transversely to the tool longitudinal axis 2 axes of rotation 24, which are normal to the tool longitudinal axis 2 and aligned parallel to each other. Thereby, the feed body 803 can be moved in a plane. Advantageously, the feed body 803 along the tool longitudinal axis 2 has a constant length (bearing clearance not taken into account), so that a shift of the same directly on the electrode holder 400..410 acts Of course, but the feed body 802 of FIG. 11 may be designed so that he along the tool longitudinal axis 2 has a constant length.
FIG. 13 now shows various possibilities of how the axes of rotation 24 of the feed body 803 can be aligned. In the left figure again normal to the tool axis 2 and mutually parallel axes of rotation 24 are shown. In the middle, two adjacent axes of rotation 24 are rotated by an angle <x. As a result, a feed element designed in this way is particularly suitable for bores extending along a helix. In the right figure, a = 90 ° is selected for the angle, so that two adjacent axes of rotation 24 each stand normal to one another. The segments are then connected gimbal-like to each other, so that the feed body in.. generally spatially extending holes can be performed.
In both advancing bodies 802, 803 trailing cables connected to the electrode holder 401 ..410 can also be arranged, which supply the electrode 301 and / or the energetic supply of the electrode holder 401..410 and / or the transmission of control signals to the electrode holder 401 ..410 serve. In particular, the trailing cables can be formed by an electrical cable. Of course, such trailing cables can be provided without a feed body 801..803, if the electrode holder 401..410 as shown for example in Figures 5 to 8 has its own drive.
Finally, it is noted at this point that the electrode holder 409 shown in FIG. 9 can be constructed analogously to the feed body 803, that is to say that its housing is formed by a plurality of segments movably connected to one another. It is advantageous if the housing is equally segmented as the internal structure of the electrode holder. In this case, the outer housing of the electrode holder can thus be formed by the housing of the segments 19. Even in this case, a strict subdivision into the feed body and the electrode holder may be unjustified.
FIG. 14 shows a schematically illustrated variant of an electrode holder 411, which has a series kinematic movement mechanism for the electrode 301. Specifically, this movement mechanism comprises a rotatably mounted plate 25, which can be deflected by a hydraulic / pneumatic cylinder 26, and a hydraulic / pneumatic cylinder 16 for displacement of the electrode 301 in the tool longitudinal axis 2, to the hydraulic / Pneumatikzylindem 16 and 26 is to notice that the hydraulic / pneumatic cylinder 26 is articulated and thus can not take over a leadership function. By contrast, the hydraulic / pneumatic cylinders 16 can assume such a guiding function since they are rigidly connected to the electrode 301 and the rotatably mounted plate 25. Thus, the electrode 301 in the N2011 / 15900 4 -20- 4 4 4 4 • 4 • 4 4 * 4 * 4 4 4 4 4 4 4 4 4 4
Move tool longitudinal axis 2 and swung out of this and thus moved transversely to the longitudinal axis of the tool 2 and are rotated about a transverse to the tool axis 2 aligned axis of rotation. In this way, running in a plane bores can be made. For the production of spatially extending bores, the feed body 5 must accordingly be rotated or the mechanism shown, for example, combined with the mechanism shown in FIG. 19.
FIG. 15 shows a further schematically illustrated variant of an electrode holder 412, which has a parallel kinematic movement mechanism for the electrode 301. In this case, the electrode 301 is connected to the main body 5 via three articulated hydraulic / pneumatic cylinders 26. In addition, the electrode 301 is also guided over a guide rod 27. This is not rigid, but has a certain flexibility, so that the electrode can be deflected as shown in Fig. 16. It is particularly advantageous in this variant that automatically results in a circular path by the flexible guide rod 27, a deflection of the tool longitudinal axis 2. By appropriate control of the hydraulic / pneumatic cylinder 26, the electrode 301 can thus be moved along any circular paths and of course also straight. Moreover, because of the parallel kinematic drive, the electrode 301 may be deflected in any direction, without the need to rotate the main body 5, or require a rotating mechanism as shown in FIG.
FIG. 17 shows a variant of an electrode holder 413, which is very similar to the electrode holder 412. Instead of the hydraulic / pneumatic cylinder 26, the electrode 301 is now controlled via Seiizüge 29 but. In order to allow a longitudinal displacement and deflection of the electrode 301, the flexible guide rod 27 is surrounded by a compression spring 28, which causes a bias voltage between the electrode 301 and the base body 5.
FIG. 18 shows a further schematically illustrated variant of an electrode holder 414 which has a hydraulic / pneumatic cylinder 26 for the movement of the N2011 / 15900 -21 -21. fr fr 44 ·· ·· · 4 · · ·· 44 * ·· · 4 4 44
Electrode 301 has. In this example, the electrode can only be pivoted out of the tool longitudinal axis 2 in one plane, since the guide rod 27 does not permit any longitudinal displacement. Such can be effected in this variant, for example via a feed body 801.803. Also advantageous here is the deflection of the electrode 301 along a circular path.
FIG. 19 shows a variant of an electrode holder 415, which is very similar to the electrode holder 414. In this example, however, the hydraulic / pneumatic cylinder 26 is not fixedly connected to the main body 5, but with a sleeve 30 which can be rotated about the tool longitudinal axis 2 via a pinion 31 driven by a motor 9. In this way, in turn, a series kinematic movement mechanism is realized, which allows a deflection of the electrode 301 in any direction.
FIG. 20 shows a further variant of an electrode holder 416, which is very similar to the electrode holder 414. In this example, however, the hydraulic / pneumatic cylinder 26 is also not fixedly connected to the main body 5, but with a sleeve 30 which can be moved over a hydraulic / pneumatic cylinder 16 along the tool longitudinal axis 2. In this way, a longitudinal feed of the electrode 301 can be effected without the base body 5 or a feed body 801.803 having to be moved for that purpose. A particularly advantageous variant of an electrode holder results if the teaching disclosed in FIG. 19 is combined with the teaching disclosed in FIG. 20. This makes it possible to move the electrode 301 along any circular paths and of course also straight.
FIG. 21 shows a variant of an electrode holder 417, which is very similar to the electrode holder 416. Instead of the hydraulic / pneumatic cylinders 16 and 26 but in this example cables 29 are provided to move the electrode 301.
In general, the teachings disclosed in the different figures can be combined as desired. For example, it is readily conceivable to combine the claws 11 disclosed in FIG. 2 with an arrangement according to FIG. 15. It would also be conceivable, for example, to expand FIG. 1 with the drive from FIG. 5 and so forth. The embodiment variants which have been pointed out are therefore to be construed as non-exhaustive and merely illustrative listing of possibilities understand, which are both individually applicable and can be combined with each modular or modular.
In particular, it is also noted at this point that the actuators shown serve merely to illustrate the functional principle of the spark erosion tool and are interchangeable with one another. For example, the means 9, 16, 26, 29 for moving the electrode 301 relative to the electrode holder 401 ..417 by at least one actuator connected to the electrode 301 from the group: pneumatic actuator, hydraulic actuator, piezoelectric actuator, electromechanical actuator - respectively designed as a linear or rotary motor - be formed. Instead of a spindle drive can therefore be used for example in the above representations, for example, a pneumatic or hydraulic actuator and vice versa. In general, actuators of any type can be used to allow movement of the EDM tool.
Of course, all means for varying a cross section of the electrode holder and for applying a transversely to the tool longitudinal axis 2 acting pressure can be controlled in any way, in particular electrically, hydraulically, pneumatically or mechanically (eg with the help of cables), For example, the in Fig 1 and electrically driven claws 11 are also moved by a pneumatic or hydraulic linear motor. In particular, it is also conceivable that the claws 11 are actuated by means of cables, which are guided behind the EDM tool through the already hergestelite hole to the outside. Similarly, for example, the clamping shown in Fig. 10 could be done via cables or an electric drive. The examples mentioned are of course only illustrative. Of course, other variants of the spark erosion tool can be equipped with deviating from the respective representation drives. N2011 / 15900 -23- «• · -23-« • · • · ι · β · ι ························································································································································································································
FIGS. 22 to 26 now illustrate an advantageous method for producing a spark-eroded hole with the aid of a spark erosion tool according to the invention.
In FIG. 22, an auxiliary body 33 with an opening extending in the tool longitudinal axis 2 and having a cross-section corresponding essentially to the electrode 301 is fixed on the workpiece 32 in the region of the hole to be produced. Thereafter, the electrode holder 401 ..417 is positioned in said opening with the electrode 301 facing the workpiece 32 and fixed in the auxiliary body 33 in a step a) by applying a pressure acting transversely to the tool longitudinal axis 2. In a further step b), the erosion voltage is switched on and the electrode 301 is moved to the processing front in a further step c). FIG. 23 shows the electrode 301 which has been extended relative to the electrode holder 401..417. In a further step d), the erosion voltage is switched off, and in a subsequent step e), the electrode 301 is moved away from the processing front relative to the electrode holder 401... In a further step f), the electrode holder 401..417 is released by lowering the pressure acting transversely to the tool longitudinal axis 2 and moved in a step g) in the direction of the machining front. This condition is shown in FIG. Then, the steps a) to g) are repeated until the hole is completed. 25 shows a state after the electrode 301 has penetrated further into the workpiece 32 with respect to the state shown in FIG. 24 with the electrode holder 401.417 fixed. Finally, FIG. 26 shows a state in which the spark erosion tool has already penetrated relatively far into the workpiece 32. After the spark erosion, the machining contour produced can be further processed or finished in a further processing step by any machining or non-cutting machining process in order to improve the surface of the bore and, in particular, to eliminate the microcracks produced during the spark erosion. Finally, it is noted that the use of an auxiliary body 33 is only an optional advantageous measure, but is not mandatory for the specified method. Of course, the spark erosion tool can be performed in other ways. N2011 / 15900 -24- • · · · · · · · · · · · · · · · · · · · · · · · · * * * * * * ·
28 now shows an advantageous embodiment of an electrode 302 for a spark erosion tool, in particular for an inventive spark erosion tool 101, 102 or as a component thereof in front view (left) and in section (right). The electrode 302 includes a base body 34 having a machining front facing portion having a cylinder surface or a ball surface. The machining front can be seen in its entirety in FIG. 27 in front view, in section that ring in the main body 34, which has the largest diameter, forms the boundary to the machining front. This is located on the right in the section. Furthermore, the electrode 302 comprises at least one groove 35 arranged in the cylindrical or spherical section, which extends from a middle region of the section to the edge thereof, and at least one bore 36 which connects a side of the electrode 302 facing away from the machining front with the at least one groove 35 , On the left side, the electrode 302 has a seat in order to be able to connect it to the electrode holder 401.417 as shown in the preceding figures.
In the concrete example, the cylindrical or spherical section of the electrode 302 comprises in its edge region a rounding reaching at least to the boundary of the machining front, which has a radius r smaller than the radius R of the cylindrical or spherical section. In this way, unsightly edges in the bore, which can arise when pivoting an edged electrode 301, can be avoided.
Moreover, in the example shown, the radius R of the cylindrical or spherical portion is less than or equal to the distance between the axis of rotation of the electrode 302 and the surface of the cylindrical or spherical portion. In this way, the electrode 302 can be used particularly well with a spark-erosion tool, in which the electrode 302 can be rotated about an axis of rotation oriented transversely to a tool longitudinal axis of the EDM tool, thus for all EDMs shown in FIGS. 14 to 21. tools. In this case, the electrode 302 slides during pivoting along an opening already made in the workpiece, that is along N2011 / 15900 -25 · · · · · · their processing front, the electrode 302 is displaceable relative to the pivot point along the tool longitudinal axis 2, so that Radius R of the cylindrical or spherical portion is preferably less than or equal to the smallest distance between the axis of rotation of the electrode 302 and the surface of the cylindrical or spherical portion.
In general, an electrode 302 having a spherical portion can be universally used because it can be pivoted about any axis. Preferably, an electrode 302 having a cylindrical portion is used when it can be pivoted only about a rotation axis (see, for example, Figs. 14, 18, 20, and 21), wherein said rotation axis and the axis of the cylinder are aligned or identical.
FIG. 28 now shows an advantageous method for producing an alternative bore in a drill string part, which connects two flushing holes, preferably using a spark erosion tool 101, 102 of the kind explained above.
Concretely, Fig. 28 shows a drill string member 37 having two straight, one-axis scavenging bores 38 and 39 which are formed into blind holes. Furthermore, the drill string part 37 comprises a recess 40. The two flushing holes 38 and 39 are connected to an arcuate, produced by spark erosion escape hole 41. Due to the arcuate extension hole 41, the drill string part 37 has good mechanical and hydraulic properties (for a fluid flowing inside the drill string part 37).
Such a replacement bore 41 can be produced particularly well with a spark-erosion tool 101, 102 of the type according to the invention. A drill string part 37 is usually a few meters long, and the flushing holes 38 and 39 protrude accordingly far into the drill string part 37. However, it is now possible by means of an electrode holder 401..417 to securely fix the spark erosion tool 101, 102 deep inside a drill string part 37 and to move the electrode 301, 302 within a narrow tolerance range. N2011 / 15900 -26- • «it ··» Φ »
In the figure 28 Spülbohrungen 38 and 39 of the same diameter and extending in the same axis are shown. However, this is by no means mandatory for the production of an alternative bore 41. Of course, the flushing holes 38 and 39 may also have different diameters and extend in different axes. In particular, it is also conceivable that a flushing bore 38, 39 is discontinued and thus passes from a larger to a smaller diameter or vice versa. Furthermore, it is also conceivable in particular for a flushing bore 38, 39 to pass into a smaller, off-axis part. These off-axis parts can be located in particular on the same pitch circle and be angularly offset. Finally, it is also conceivable that, unlike the case shown in FIG. 28, the alternative bore 41 has the same diameter as the flushing bores 38 and 39.
Finally, it should be noted that the embodiments show possible embodiments and possible applications of a fun kenerosions tool according to the invention, it being noted at this point that the invention is not limited to the specifically illustrated embodiments and applications thereof, but rather also various combinations of the individual Variants are possible with each other and this variation possibility due to the doctrine of technical action by objective invention in the skill of those working in this technical field. Thus, all conceivable variants, which are possible by combinations of individual details of the illustrated and described variant, are also included in the scope of protection.
In particular, it is noted that an EDM tool may in reality also comprise more components than illustrated.
For the sake of order, it should finally be pointed out that, for a better understanding of the design of the EDM tool, this or its components have been shown partly out of scale and / or enlarged and / or reduced in size. N2011 / 15900 -27- * 9 -27- * 9 φ «·» • · # Μ 9 9 9 9 9 9 9 ♦ # * 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9
The task underlying the independent inventive solutions can be taken from the description. N2011 / 15900

权利要求:
Claims (30)
[1]
• • • * • 4 •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1. spark erosion tool (101, 102) comprising an electrode (301, 302) arranged on a tool longitudinal axis (2) and an electrode holder (401, ... 177) aligned along the tool longitudinal axis (2) and connected to the electrode (301, 302) , which comprises means for moving the electrode (301, 302) relative to the electrode holder (401..417), characterized in that the electrode holder (401..417) has means (6, 11, 12, 13, 15) for applying a transversely to the tool longitudinal axis (2) acting pressure in the region of an imaginary, in the tool longitudinal axis (2) extending hose (7) having a substantially the electrode (301, 302) corresponding cross-section.
[2]
2. Spark erosion tool (101,102) according to claim 1, characterized by means for varying (6,11,12,13) of a cross section of the electrode holder (401..417) transversely to the tool longitudinal axis (2).
[3]
3. Spark erosion tool (101,102) according to claim 2, characterized in that the means for varying a cross section of the electrode holder (401.417) and for applying a transversely to the tool longitudinal axis (2) acting pressure by extendable and / or swingable Klemmelemen te / claws (6, 11) are formed.
[4]
4. spark erosion tool (101, 102) according to claim 3, characterized in that a housing of the electrode holder (401.417) is elastic and the clamping elements / claws (6,11) act through this housing. N2011 / 16900 -2- • φ φ · φ • · · Φ ΦΦΦ • # Φ Φ * Φ ♦ Φ Φ Φ ·· 'i ΦΦΦ • Φ Φ Φ • Φ • • • Φ Φ * Φ Φ% Φ • Φ Φ · ♦♦
[5]
5. Spark erosion tool (101, 102) according to one of claims 2 to 4, characterized in that the means for varying a cross section of the electrode ha Iters (401 ..417) and for applying a transversely to the tool longitudinal axis (2) acting pressure are formed by a pneumatically or hydraulically actuated bellows / swell body (12,13).
[6]
6. spark erosion tool (101, 102) according to one of claims 1 to 5, characterized in that the electrode holder (401.417) comprises means for its movement.
[7]
7. spark erosion tool (101,102) according to claim 6, characterized in that the means of locomotion by driven wheels (15) are formed.
[8]
8. spark erosion tool (101,102) according to claim 6 or 7, characterized in that the electrode holder (401.417) comprises at least two, in the tool longitudinal axis (2) mutually movable segments, each means (12) for applying a transverse to the tool longitudinal axis ( 2) acting pressure or for varying a cross section of the electrode holder (401.417) have.
[9]
9. spark erosion tool (101,102) according to one of claims 1 to 8, characterized by a along the tool longitudinal axis (2) aligned flexible, rod-shaped or tubular feed body (801.803) which is connected to the electrode holder (401.417).
[10]
10. spark erosion tool (101,102) according to claim 9, characterized in that the feed body (803) comprises a plurality of rigid and along the tool longitudinal axis (2) arranged segments (23) which are movably connected to each other. N2011 / 15900

• 4 • 4 # 44 4 44 4 • • • * • * 44 • • * • * • • 4 * 4 4 4 • • 4 444 • 44 # 4
[11]
11. Spark erosion tool (101, 102) according to claim 10, characterized in that the segments (23) are aligned with each other transversely to the tool longitudinal axis (2) rotational axes (24), wherein all axes of rotation (24) normal to the tool longitudinal axis ( 2) and are aligned parallel to each other or all axes of rotation (24) are aligned normal to the tool longitudinal axis (2) and two adjacent axes of rotation (24) are rotated by an angle α.
[12]
12. Spark erosion tool (101,102) according to one of claims 9 to 11, characterized in that the feed body (801.802) along the tool longitudinal axis (2) has a constant length.
[13]
13. spark erosion tool (101,102) according to any one of the preceding claims, characterized in that the electrode (301, 302) relative to the electrode holder (401.417) in the Werkzeugiängsachse (2) and / or transversely to it is movable.
[14]
14. Spark erosion tool (101, 102) according to any one of the preceding claims, characterized in that the electrode (301, 302) relative to the electrode holder (401.417) is rotatable, wherein the axis of rotation is aligned transversely to the tool longitudinal axis (2).
[15]
15. Spark erosion tool (101, 102) according to one of the preceding claims, characterized in that the electrode (301, 302) relative to the electrode holder (401.417) is rotatable, wherein the axis of rotation is aligned parallel to the tool longitudinal axis (2) or with this coincides
[16]
16. A spark erosion tool (101, 102) according to any one of claims 1 to 15, characterized in that the means (9, 16, 26, 29) for moving the electrode (301, 302) relative to the electrode holder (401.417) by little 1/15900 -4- -4- * · • · * ♦ • * * • • • • • 4 • • • ♦ · «* Μ · # · • ···« · i «• · ·« «• ♦ * * »at least one connected to the electrode (301,302) actuator from the group: pneumatic actuator, hydraulic actuator, piezoelectric actuator, electromechanical actuator - each designed as a linear or rotary motor - are formed.
[17]
17. Spark erosion tool (101,102) according to one of claims 1 to 16, characterized in that the means for moving the electrode (301, 302) relative to the electrode holder (401..417) by cables (29) are formed, which with the electrode (301, 302) are connected.
[18]
18. Spark erosion tool (101,102) according to one of the preceding claims, characterized by in the region of the tool longitudinal axis (2) and arranged with the electrode holder (401..417) connected trailing cables, which the electrical supply to the electrode (301, 302) and / or the energetic supply of the electrode holder (401..417) and / or the transmission of control signals to the electrode holder (401..417) serve.
[19]
19. Spark erosion tool (101, 102) according to one of the preceding claims, characterized in that a housing of the electrode holder (401..417) is flexible and an internal structure thereof comprises a plurality of rigid segments which are mutually movable and in soft the means (6,11,12,13,15) for applying a transversely to the tool longitudinal axis (2) acting pressure and / or the means (9,16, 26, 29) for moving the electrode (301, 302) relative to the electrode holder (401 ..417) and / or a control of said means (6, 9, 11, 12, 13, 15, 16, 26, 29) are arranged.
[20]
20 electrode (302) for a spark erosion tool, in particular for a spark erosion tool (101,102) according to one of claims 1 to 19 o-the part thereof, characterized by a machining front facing portion having a cylinder surface or a spherical surface, N2011 / 15900 ••••••••••••••••••••••• ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• at least one groove (35) arranged in this section, which runs from a middle region of the section to the edge thereof and at least one bore (36), which connects a side of the electrode (302) facing away from the machining front with the at least one groove (35) ,
[21]
21 electrode (302) according to claim 20, characterized in that the cylindrical or spherical portion comprises in its edge region reaching at least to the border of the processing front rounding having a radius (r) which is smaller than that of the radius (R ) of the cylindrical or spherical portion.
[22]
The spark erosion tool having a rotatable electrode (302) according to claim 20 or 21, wherein the rotation axis is oriented transversely to a tool longitudinal axis of the EDM tool, characterized in that the radius (R) of the cylindrical or spherical portion is less than or equal to the distance between the axis of rotation of the electrode (302) and the surface of the cylindrical or spherical portion.
[23]
23. spark erosion tool (101,102), characterized by the features of claims 14 and 22nd
[24]
24. A method for producing a spark-eroded hole by means of an electrode (301, 302) arranged on a tool longitudinal axis (2) and an electrode holder (401) aligned along the tool longitudinal axis (2) and connected to the electrode (301, 302). 417), characterized by the steps of: a) fixing the electrode holder (401 ..417) by applying a pressure acting transversely to the tool longitudinal axis (2) in an opening extending in the longitudinal axis of the tool (2), which essentially corresponds to the electrode (301 , 302) has the corresponding cross-section, N2011 / 16900 -6-... B) switching on the erosion voltage c) moving the electrode (301, 302) opposite to the electrode holder (401.417) towards an operating front, d) switching off the erosion voltage e) moving the electrode (301, 302) versus above the electrode holder (401.417) away from the processing front, f) releasing the electrode holder (401 ..417) by lowering the said pressure acting transversely to the tool longitudinal axis (2), g) moving the electrode holder (401.417) in the direction of the processing front and repeat steps a) to g)
[25]
25. The method according to claim 24, characterized in that before step a) a Hiifskörper (33) having a in the tool longitudinal axis (2) extending opening, which has a substantially the electrode (301, 302) corresponding cross-section, in the region of Fixed hole to be punched and the electrode holder (401.417) in said opening with the workpiece (32) facing electrode (301,302) is positioned.
[26]
26. The method according to claim 24 or 25, characterized in that said opening in which the electrode holder (401.417) is fixed, by the electrode (301, 302) has been prepared.
[27]
27. The method according to any one of claims 24 to 26, characterized in that the machining contour produced is further processed by the spark erosion by machining or non-cutting machining process.
[28]
A method of making an alternate bore (48) in a drill string member (47) connecting two straight purge wells (39, 41), characterized in that: N2011 / 15900 • • • · * • · · • »•» • ·· %> # «* •» • ♦ • · • • · · ············································································································································································································
[29]
29. The method according to claim 28, characterized in that the alternative bore (48) is produced by a method according to claims 24 to 27.
[30]
30. Use of a spark erosion tool (101,102) according to one of claims 1 to 23 for producing an arcuate hole (48) in a drill string part (47), which connects two straight flush bores (39, 41). Schoeller-Bleckmann Oilfield Technology GmbH

N2011 / 15900

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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ATA640/2012A|AT512987B1|2012-06-04|2012-06-04|Spark erosion tool and electrode for a spark erosion tool|ATA640/2012A| AT512987B1|2012-06-04|2012-06-04|Spark erosion tool and electrode for a spark erosion tool|

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US13/903,101| US9889514B2|2012-06-04|2013-05-28|Spark erosion tool and electrode for a spark erosion tool|

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EP13170072.6A| EP2671659A3|2012-06-04|2013-05-31|Spark erosion tool, electrode for a spark erosion tool and method for creating a hole by spark erosion|

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DE102013105680A| DE102013105680A1|2012-06-04|2013-06-03|Spark erosion tool and electrode for a spark erosion tool|

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JP2013116964A| JP2013248730A|2012-06-04|2013-06-03|Spark erosion tool and electrode for spark erosion tool|