• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for pressing a green compact (1) for producing a sintered compact from a sintered powder, after which the sintering powder is introduced into a mold cavity (43a) of a die (43), and then the sintered powder having at least one stamp at least partially in the molding cavity (43a) is inserted, to the green compact (1) is pressed, wherein for forming an undercut region on the green body (1) a proportion of the sintering powder with a punch from a first plane of the die (43) to form a Breakthrough (11) in the first plane in the pressing direction in a second, different from the first plane level of the die (11) is moved. Furthermore, the invention relates to a device (12) for carrying out this method and a correspondingly produced sintered molded part.
    公开号:AT515961A1
    申请号:T50425/2014
    申请日:2014-06-18
    公开日:2016-01-15
    发明作者:
    申请人:Miba Sinter Austria Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a method for pressing a green compact for producing a sintered compact from a sintered powder, after which the sintering powder is introduced into a mold cavity of a die, and then the sintered powder with at least one punch, which is at least partially injected into the mold cavity , is pressed to the green compact.
    The invention further relates to an apparatus for pressing a green compact from a sintered powder sintered compact, comprising a die having a die cavity for receiving the sintering powder to be compacted, and a die having a pressing face which is contactable with the sintering powder to be compacted is, wherein the punch has at least a first stamp part and at least one second stamp part.
    Moreover, the invention relates to a sintered molded part with at least one undercut region.
    Metallic components with complex geometry are today often produced for cost reasons by powder metallurgical processes. For this purpose, a green compact is known to be pressed from a sinter powder, which is subsequently sintered and optionally calibrated. The pressing takes place in a die with a punch and a lower punch, wherein depending on the flexibility of the punch, the compression is carried out uniaxially or biaxially. After the die is performed um¬fänglich closed, the production of radial Hinter¬schneidungen is a problem, since the green compact can not be pushed out of the press after pressing, unless additional design measures are provided on the die. For the production of radial undercuts, the green compacts or the finished sintered moldings are therefore often machined by machining.
    However, presses are also known from the prior art with which such radial undercuts are already produced in the press. Thus, for example, DE 94 08 317 U1 discloses an apparatus for producing pressed metal powder with at least one rear intersection lying transversely to the pressing direction, comprising a pressing device with at least one movable punch and a die, the die being two or more transverse to the pressing direction having movable jaws, at least one of which has a recess on the pressing surface. The undercut is thereby formed by forming a one-piece pressed blank to the finished part by a zu¬sätzlichen pressing operation on this. So it is an additional pressing step required, which is associated with a corresponding cost increase of Sinterform¬teils. Similarly, DE 195 08 952 A1 describes a die in which segment slides are brought into the inner end position by tangential displacement of segment pistons, in which they protrude far into the column of powder in the cavity, as is the case with the undercut is desired. The upper punch is then moved down, so that on the one hand the column of powder in the cavity from the top, on the other hand, is compacted by the opposing lower punch from below. The segment slides are then moved back into their initial position by moving the segment piston backward in a tangential manner. Thereby, the green compact under load of the upper punch, formed with the downward movement of the die and then ejected through the lower punch. The undercut is thus formed in a process step, but the die is relatively constructed.
    In principle, there is also the possibility that the die itself is opened for the ejection of the green body, for which purpose an at least two-part die is required, which has the division in the pressing direction. The disadvantage here is that due to the green matter adhering to the pressing surfaces, breakouts often occur on the green product.
    The present invention has for its object to produce a sintered molding with at least one radial undercut.
    In the case of the method mentioned at the outset, this object is achieved in that, to form an undercut region on the green body, a portion of the sinter powder with a punch from a first plane of the die forms a breakthrough in the first plane in the pressing direction into a second one first level different level of the die is moved.
    Furthermore, the object of the invention in the aforementioned device is achieved in that the second stamping part projects beyond the pressing surface of the stamp in the direction of the mold cavity.
    In addition, the object of the invention is achieved in the sintered molding mentioned above in that the sintered molded part is produced by the method and the undercut area is made without machining, wherein the undercut area has a web extending in a first direction, and wherein at one end of the An angled portion is formed, which extends in a second direction, which runs orthogonal to the first direction, and further wherein the sintered shaped part has at least one opening, which is formed in the first direction spaced for bending, wherein the opening in the first direction has a cross-sectional area that is at least approximately equal in size and at least approximately the same shape as the cross-sectional area of the angling in this first direction.
    The advantage here is that the movement of the stamp parts to form the Hinter¬ cutting exclusively in one direction, namely the pressing direction erfolgt.Es are therefore no tangential deliveries of sliders, etc., required, whereby the die can be structurally simpler design. In particular, no additional pressure-generating devices are required, since the displacement of the sintering powder takes place via the stamp itself. It is thus possible, with only one movement, i. with only one direction of movement to produce the undercut and durchzu¬ perform the compaction of the sintering powder. In addition, the advantage is thereby achieved that the sintered molded part has a lower weight in comparison to conventionally produced sintered molded parts of the same geometry, since the production of the undercut is associated with the formation of a breakthrough and thus a corresponding proportion of sintering powder is saved can.
    According to an embodiment variant of the method, it can be provided that the proportion of the sintering powder shifted to the second level is compressed higher than the remaining portion of the sintering powder. The green compact thus has a higher green density and thus a higher strength in the area of the undercut. It can thus be improved demoulding of the green compact by material eruptions during demolding can be better avoided. In addition, in the finished sintered molded part in the region of the undercut can be a higher strength.
    In order to improve the displaceability of the sintering powder, it may further be provided that the sintering powder is supported exclusively from below, at least at the beginning of the displacement of the portion of the sintering powder.
    According to an embodiment variant of the device, it can be provided that the second stamp part is fixed in the first stamp part. It can be done to me only one movement of the stamp both the displacement of the powder and the subsequent compaction of the sintering powder to the green compact.
    On the other hand, it is also possible for the second stamp part to be adjustable relative to the first stamp part. On the one hand so that the width of the undercut in the pressing direction is adjustable, so that with the device several different sintered moldings can be produced. On the other hand, this allows the supernatant of the second stamped part over the pressing surface to be reduced when immersed in the sintering powder, whereby the dimensional accuracy of the sintered compact can be improved by increasing the risk of the second stamping part becoming entangled in the sintering powder during sintering unpredictable resistance ver¬biegt, and thus the undercut would be formed deviating shape, can be reduced.
    For a better understanding of the invention, this will be explained in more detail with reference to the following figures.
    In each case, in a highly simplified, schematic representation:
    1 shows a green compact for producing a sintered molded part in an oblique view; 2 an upper punch in an oblique view;
    3 shows a lower punch in an oblique view;
    Fig. 4 shows a detail of a device for pressing a green compact in the position before the displacement of a portion of the sintering powder;
    Figure 5 shows a detail of a device for pressing a green compact in the position during the displacement of a portion of the sintering powder.
    Fig. 6 shows a detail of a device for pressing a green compact in the position after the displacement of a portion of the sintering powder.
    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 designations, wherein the disclosures contained in the entire description apply mutatis mutandis to the same parts with the same reference numerals. same component names can be transferred. Also, the location information chosen in the description, such as up, down, laterally, etc. related to the directly described and illustrated figure and these conditions are to be transferred in a change in position mutatis mutandis to the new situation.
    In Fig. 1 shows a green body 1 in an oblique view.
    In the context of the invention, a green compact 1 is understood to mean a molded part pressed from a sintered powder in the stage immediately after the pressing of the sintered powder in a corresponding press and before sintering, as corresponds to the general technical usage. The green body 1 is thus a blank from which the (finished) product is produced by sintering.
    Sintering processes (powder metallurgical processes) for the production of sintered components are described sufficiently in the prior art, so that reference is made to avoid repetition. It should only be mentioned here that these methods usually comprise at least the steps of powder pressing and sintering. Further process steps may be upstream (powder mixing) or re-stored (calibration, reworking, etc.).
    The green body 1 has at least approximately the component shape of the finished Sinterform¬teils. By at least approximately, it is meant that dimensional changes during sintering in green body 1 are usually taken into account. Preferably, the green compact 1 has near net-shape or net-shape quality.
    The green body 1 is formed in the form of a so-called pressure plate for a disk pack of a multi-plate clutch. It should be noted that this particular form is only one (preferred) embodiment of the green compact 1. Other shapes for the green compact 1 are also possible within the scope of the invention, as long as they have at least one undercut 2 made according to the method of the invention or with the device according to the invention, which will be explained in more detail below.
    The green body 1 has a base body 3, which is formed in particular annular. On the basic body 3, on a radially outer face 4, several, in particular evenly distributed over the circumference of the base body 3, cams 5 and teeth are arranged, which project from the end face 4 starting in ei¬ner radial direction 6 outwardly beyond the base body 3 erstre¬cken.
    In an axial direction 7 extending on the base body 3 a ringför¬miger web, in particular a ring land 7a is arranged. The annular web, in particular the annular web 7a, has at an axial end face 8 a plurality of projections 9, which are likewise preferably distributed uniformly over the circumference of the web. The projections extend in the axial direction 7. At the end of the projections, bends 10 (legs) are formed, which extend in the radial direction 6 to the outside, so that on the one hand the pros
    Jumps have an L-shaped cross section, and on the other hand, the Hinter¬schneidungen 2 are formed.
    The inner periphery of the green compact 1 is preferably free of protrusions, etc.
    Viewed in the axial direction 7, the escape of the angled portions 10 in the base body 3 are formed through openings 11, with one opening 11 present per bend 10. Each of the apertures 11 has a cross-sectional area which, viewed in the axial direction 7, has at least approximately, in particular precisely, the same shape and size as the cross-sectional area of the angled portions 10 in the axial direction 7. The reason for this will be explained in more detail below.
    The undercuts 2 were formed during the pressing of the sintering powder to produce the green compact 1 and were not post-machined, i. produced by machining processes.
    In general, the green compact 1, and thus also the sintered molded part produced therefrom, has at least one undercut region, i. at least one undercut 2, wherein the undercut region is produced without machining, the undercut region having a web which extends in a first direction, and at one end of the web a bend 10 is formed which extends extends in a second direction which is ortho¬gonal to the first direction. Furthermore, the green compact 1 generally has at least one opening 11, which is formed in the first direction at a distance from the bend 10, the opening 11, viewed in the first direction, having a cross-sectional area which is at least approximately equal and at least approximately has the same shape. how the cross-sectional area of the Abwin¬kelung 10 viewed in this first direction.
    The first direction in the embodiment of the green compact 1 according to FIG. 1 is the axial direction 6. The second direction is the radial direction 7 in the exemplary embodiment of the green compact 1 according to FIG. 1.
    With the formulation that the cross-sectional area of the aperture is at least approximately equal in size and at least approximately the same shape as the cross-sectional area of the angled portion 10 in this first direction, it is meant in the final sintered component 1 that, depending on the composition, sintering of the sintering powder, from which the sintered component is produced, can lead to a growth of the green body 1, so that the cross-sectional surfaces no longer equal to each other 100%. For example, this may be the case when the sintering powder contains chromium.
    The green body 1 is formed in one piece.
    For producing the green compact 1, a device 12 for pressing the green compact 1 from a sintering powder can be used, as shown in detail in FIG. 4 to 6 is shown. This device 12 comprises an upper punch 13 and a lower punch 14, which are better seen in FIGS. 2 and 3, respectively.
    2 shows the upper punch 13 in an oblique view. This upper punch 13 comprises a first stamp part 15 and a second stamp part 16 or consists of the first stamp part 15 and the second stamp part 16.
    The first stamp part 15 is at least approximately cylindrical in shape and has an end face pointing downwards in an axial direction 17, which forms a pressing surface 18. In an outer circumferential surface 19 of the first Stem¬pelteils 15 of the upper punch 13 a plurality of ribs 20 are formed. These ribs 20 are in particular distributed uniformly over the outer circumference of the lateral surface 19 of the first stamp member 15. The radially outwardly directed cams 5 of the green body 1 are produced via these ribs 20. In addition, it is thus possible to achieve guidance of the upper punch 13 in the compression mold during the compression stroke.
    In general, the shape of the first stamping part 15 of the upper punch 13 depends on the geometry or the shape of the sintered shaped part to be produced and thus on the geometry or shape of the green compact 1 to be produced. The star-shaped part 15 according to FIG. 2 can therefore be seen as an example and can have a deviating geometry or shape.
    The second stamp part 16 of the upper punch 13 also has an at least approximately cylindrical base body 21. At this base 21 are at a downward, i. in the direction of the first stamp part 14 facing end face 22 a plurality of finger-shaped extensions 23 are arranged. The number of these finger-shaped projections 23 and their location on the end face 22 thereby according to the number and the location of the undercuts 2 amGrünling 1 (Fig. 1).
    As better seen in Fig. 4 it can be seen, the first stamp member 15 in the axial direction 17 through openings 24. The number depends on the number of finger-shaped extensions 23 of the second stamp part 16 of the top punch 13. In each of the openings 24, one of the finger-shaped extensions 23 is received and optionally guided.
    Returning to FIG. 2, it can be seen that the finger-shaped projections 23 have a length such that their free ends 25 project beyond the pressing surface 18 of the first stamping part 15 of the upper punch 13 in the axial direction 17.
    Furthermore, the main body 21 of the second stamp part 16 is preferably arranged spaced apart from the first stamp part 15, so that the finger-shaped extensions 23 also extend between the main body 21 of the second stamp part 16 and the first stamp part 15, as shown in FIG. It is thus possible that a height 26 of the supernatant of the free ends 25 of the finger-shaped extensions can be adjusted by a relative displacement of the second die part 16 with respect to the first die part 15 in the direction of the axial direction 17.
    However, there is also the possibility that-unlike in FIG. 2 -the basic body 21 of the second stamp part 16 is arranged immediately following the first stamp part 15, so that the finger-shaped extensions 23 can not be seen in this area.
    There is also the possibility that the base body 21 of the second stamp member 16 is at least partially immersed in the first stamp member 15, for which purpose a corresponding recess can be provided in the first stamp member 15.
    In Fig. 3, the associated lower punch 14 is shown in an oblique view and in the manner of an exploded view. The lower punch 14 has a first Unterstem¬pelteil 27, arranged in this or push-in second Unterstem¬pelteil 28, arranged in the latter or insertable third Unterstem¬pelteil 29 and a core rod 30 on. All of the lower punch parts 27 to 29 and the core bar 30 are at least approximately cylindrical in shape. However, as with the upper punch 13, it should be pointed out that the geometry or the shape of the lower punch 14 may differ from that shown in FIG. 3, since these depend on the geometry or shape of the sintered part to be produced and so that the greenling 1 judges.
    The core rod 30 extends in an axial direction 31 through the Unterstem¬pelteile 27 to 29 and ends above a pressing surface 32 of the lower punch 14, as better seen in FIG. 4 can be seen. The pressing surface 32 is formed by the upwardly and in the axial direction 31 facing end face of the first Unterstem¬pelteils 27.
    Optionally, a termination plate 33 may be disposed on the core rod 30 in the region of the pressing surface 32. Thus, since the powder filling height can be fixed by the position of the core bar 30, it is possible to easily change the filling height by replacing this end plate 33.
    Like the first stamp part 15 of the upper punch 13, the first lower punch part 27 also has a plurality of ribs 35 distributed uniformly over the outer circumference of the first lower punch part 27 on an outer lateral surface 34. The ribs 35 also preferably extend only over a partial region of the height of the first lower punch part 27, starting from the pressing surface 32 in the axial direction 31. These ribs 32 are also primarily used to produce the cams 5 of the green compact. Secondary can thus be achieved with a guide of the lower punch 14in the mold.
    Furthermore, the first lower punch part 27 has, on an inner circumferential surface 36, a plurality of grooves 37 distributed uniformly uniformly over the inner circumference of the first lower punch part 27. The grooves 37 have a longitudinal extent in the axial direction 31. The grooves 37 serve on the one hand to produce the projections 9 of the green compact 1 according to FIG. 1, and on the other hand to produce the undercuts 2 of the green compact 1. The grooves 37 preferably extend over the entire height of the first lower punch member 27 in the axial direction 31. Further, the grooves 37 are uniformly distributed over the inner periphery of the first lower punch part 27 of the lower punch 14.
    It should be noted that the protrusions 9 on the green body 1 need not necessarily be provided, but the bends 10 can be formed directly on the web, so in the embodiment of the green compact 1 of FIG. 1 on the ring land 7a. The annular web 7a is formed by a corresponding annular recess 38 in the region of the pressing surface 32 of the first Unterstem¬pelteils 27. The recess 38 can be provided by a corresponding spacing of the core rod 30 from the inner circumferential surface 36 of the first lower punch part 27.
    The number of grooves 37 and / or their uniform distribution over the inner circumferential surface 36 of the first lower punch part 27 can deviate from the embodiment variant of the first lower punch part 27 shown in FIG. 3, which directs them according to the green compact 1 to be produced in each case. As already mentioned, the green compact 1 according to FIG. 1 is only one possible embodiment variant of a green compact.
    The second and the third lower punch part 28, 29, like the second punch part 16, each have an at least approximately cylindrical base body 39, 40. At each of these base body 39, 40 finger-shaped projections 41 and 42 are arranged, in particular integrally connected to the respective base body 39 and 40verbunden.
    The number and location of the finger-shaped extensions 41, 42 of the second lower punch part 28 and of the third lower punch part 29 corresponds to that of the finger-shaped extensions 23 of the second punch part 16 of the upper punch 13.
    With the help of the finger-shaped extensions 41 of the second, radially inwardly adjoining the first lower punch part 27 lower punch part 28, the Hinter¬schneidungen be prepared, as will be explained below.
    With the aid of the finger-shaped extensions 42 of the third, radially inwardly adjoining the second lower punch part 28 lower punch part 29, the projections 9 of the green compact 1 (FIG. 1) are produced.
    If the green body 1 has no projections 9, that is to say that the angled portions 10 are connected directly to the web (annular web 7a), the third subordinate part 29 can therefore be dispensed with. In this case, the lower punch 14 comprises only the first lower punch part 27, the second lower punch part 29 and the core bar 30 bzw. consists of these components.
    The second lower punch part 28 may be arranged fixed or displaceable in the first lower punch part 27. Furthermore, the third lower punch part 29 may be arranged fixedly or displaceably in the second lower punch part 28.
    The first stamp member 15 and / or the second stamp member 16 of the upper punch 13 is or are preferably formed in one piece. Likewise, the first lower punch part 27 and / or the second lower punch part 28 and / or the third lower punch part 29 and / or the core bar 30 are integrally formed.
    The production of the undercuts 2 in the green body 1 (FIG. 1) will be explained in more detail with reference to FIGS.
    It should be noted at this point that due to the process, a ring-shaped undercut can not be produced. The method and the device 12 according to the invention are only suitable for producing partially undercuts 2 which are viewed over the circumference of the green compact.
    4 to 6 each show cut-outs in cross-section from the device 12 for pressing (compacting) the green compact 1 (FIG. 1). In addition to the upper punch 13 and the lower punch 14, this device 12 has at least one die 43, which forms the above-mentioned mold. In addition, the apparatus 12 may include the usual means such as supports, locators for the punches and / or the die 43, drive means, etc., as is conventional for such presses for manufacturing powder metallurgy components. Reference is therefore made to avoid repetition of the relevant prior art.
    Thus, in FIG. 4, the relative position of the upper punch 13 to the lower punch 14 is open, but already filled, die 43. In FIG. 5, the position for producing the undercuts 2 (FIG. 1) and in FIG (Verdichtungsstellung) shown.
    In a first step, in a mold cavity 43a, the die 43 is filled with a (metallic) powder 44 for producing the green body 1, for example a sintered steel powder, as known from the prior art. The powder 44 is filled up to the upper edge of the core rod 30 or its end plate 33. The finger-shaped extensions 41 of the second lower punch part 28 are thereby arranged with their free end surface at the level of the pressing surface 32 of the first Unterstem¬pelteils 27, so that these free end surfaces form a plane with the pressing surface 32 of the first lower punch part 27.
    The finger-shaped extensions 42 of the third lower punch portion 29, however, are placed so that their free end surfaces terminate below the pressing surface 32 of the first lower punch portion 27. Thus, the grooves 37 (Figure 3) in the inner jacket surface 36 of the first lower punch member 27 are filled more deeply with the powder 44. By this position of the finger-shaped extensions 42 of the third lower punch member 29, the protrusions 9 of the green compact 1 (Figure 1) are formed. The finger-shaped extensions 41 of the second lower punch part 28 are arranged at a distance from the core bar 30.
    After filling the die 43 with the powder 44, the closing movement takes place. For this purpose, the upper punch 13 and / or the lower punch 14 is also moved downwards and / or the die 43 upwards. In this case, the finger-shaped extensions of the second stamp member 16 dip into the powder 44, as shown in Fig. 5. By this immersion, a part of the powder 44 for Fierstellung of the main body 3 of the green body 1 from the plane of the base body 3 out down to a second, different from the first level Ebe¬ne shifted and in the main body 3, the openings 11 (Fig. 1) generated. At the same time, the bends 10 of the green body 1 (FIG. 1) are produced from the shifted portions of the powder 44. Synchronously with the downward movement of the finger-shaped extensions 23 of the second stamping part 16 of the upper punch 13, the second lower punch part 28 moves downwards and supports the portion of the powder 44 to be displaced. The powder is displaced to the desired width of the flute cuts 2 in the axial direction 7 (FIG. Fig. 1) according to, wherein the extent of the compression of the powder 44 is taken into account.
    Finally, with a further movement of the upper punch 13 further downwards and / or with an upward movement of the lower punch 14, the compression of the powder 44 takes place, as shown in FIG. The finger-shaped extensions 23 of the second stamp part 16 of the upper punch 13 preferably no longer change their relative position to the first punch part 15 of the upper punch 13. Alternatively or additionally, the finger-shaped extensions 41 of the second lower punch part 28 of the lower punch 14 preferably change their relative position to the first lower punch part 27 of the lower punch 14 also no longer. However, the finger-like extensions 23 and the finger-shaped extensions 41 can be moved further towards each other, as required, to achieve additional compression of the bends 10, i. a higher compression of the powder 44 compared to the compression of the base body 3 of the green body 1.The finger-like projections 23 can be moved downwards and / or the finger-shaped extensions 41 so that the distance between these projections 23, 41 in FIG axial direction of the device 12 is reduced.
    Alternatively, by a corresponding movement of the finger-shaped extensions 23 and / or the finger-shaped extensions 41, the distance between these projections 23, 41 can be increased during the compression of the powder 44, so that the angled portions 10 have a relatively high compression compared to the base 3 of the green body Experienced.
    After the compacting of the powder 44, the green compact 1 may be ejected. For this purpose, the upper punch 13 is moved upwards and / or the die 43 down so that the mold cavity of the die 43 is released. Thereafter, the green compact 1 can be ejected by an upward movement of the lower punch 14 and / or a further downward movement of the die 43.
    Preferably, working with stationary die.
    In addition, it should be noted that the upper punch 13 or the lower punch 14 are fastened to an upper punch holder 45 and a lower punch holder 46, respectively. For this purpose, corresponding frets 47, 48 may be provided on the first stamp part 15 of the upper punch 13 and the first lower punch part 27 of the lower punch 16 on their outer lateral surfaces 19, 34, as shown in particular in FIG. 4 can be seen.
    The second stamped set 6 of the upper punch 13 can also be fastened via an appropriate collar 49 to the upper punch receptacle 45 or to a separate punch receptacle. Thereby, the relative position of the second punch part 16 to the first punch part 15 of the upper punch 13 is fixed in the axial direction.
    It is also possible that the second second stamp part 16 of the upper punch 13 is fixed in the first stamp part 15. In the event that the second stamped set 6 of the upper punch 13 is fastened to a sealed stamp receiver, it is also possible for this punch holder to be provided with its own drive, for example a hydraulic drive, so that the relative position of the second stamp member 16 to the first stamp member 15 of the upper punch 13 in the axial direction before and / or during the pressing of the powder 44 can be changed. The fin-shaped projections 23 of the second stamp member 16 can thereby act in the manner of a slider.
    It is further possible that all the undercuts 2 have the same width in the axial direction 7 of the green compact 1 (Figure 1). On the other hand, it is also possible to form at least some of the undercuts with a different width. For this purpose, the finger-shaped extensions 23 of the second punch part 16 of the upper punch 13 and / or the finger-shaped projections 41 of the second lower punch part 28 of the lower punch 14 can be designed to have different lengths. If the extensions 23 and / or the projections 42 are designed to be individually movable, it is also possible that this is effected by different delivery of the extensions 23 and / or the projections 42.
    It is also possible that at least some of the lower punch parts 28, 29 and / or the second punch part 16 of the upper punch 13 are formed with stops for limiting the mobility in the axial direction 31 and 17, including these parts of the punch on the outer lateral surfaces, for example can be provided with collars, as for example 2 and 3 can be seen from Figs.
    Alternatively or additionally, the finger-shaped extensions 23 of the second stamp part 16 of the upper punch 13 can have a cross-sectional taper, as can be seen from FIG. 4. A stop for limiting the relative adjustability of the second stamp part 16 with respect to the first stamp part 15 of the upper punch 13 is thus also achieved.
    The same applies to the finger-shaped extensions of the second lower punch part 28 of the lower punch 14, as can also be seen from FIG. 4.
    The design of the length of the ribs 20 and / or the ribs 35 can also be used to limit the adjustability of the upper punch 13 and / or the lower punch 14 with respect to the relative position to the die 43.
    From the above results as a basic principle of the invention that zumin¬dest an undercut 2 can be produced in a green body 1 by a
    Proportion of the compacting (compacting) powder 44 with a punch (the second punch member 16) from a first plane of the die 43 is displaced to form a breakthrough 11 in the first plane in the pressing direction in a second, different from the first plane level of the die 43. In this case, another stamp (the second lower punch part 28) acted as a support during the pushing of the portion of the powder 44. The portion of the powder 44 to be displaced is pressed down with the first punch (the second punch portion 16) and thereby from the further punch (the second lower punch portion 28), so that the powder 44 preferably does not fall freely downwardly. Vorzugswei¬se move the punch and the other stamp synchronously.
    In the context of the invention, the reverse movement execution is also possible, that is to say that the at least one undercut 2 is produced by displacing the portion of the powder 44 upwards. It is also possible that the movement is carried out with only one punch (part), i. without the support of a second punch (part).
    In FIGS. 2 and 3, transverse grooves are shown on the finger-shaped extensions 23. These may optionally be placed on the finger-shaped extensions 23. Through these transverse grooves, the fit of the tool can be improved. In addition, with these transverse grooves, automatic wiping cleaning can be achieved.
    For the sake of order, it should finally be pointed out that, for a better understanding of the structure of the device 12, these or their components have been shown in part to be out of scale and / or enlarged and / or reduced in size.
    REFERENCE SIGNS LIST 1 green body 30 core rod 2 undercut 31 direction 3 base body 32 pressing surface 4 end surface 33 end plate 5 cam 34 lateral surface 6 direction 35 rib 7 direction 36 lateral surface 7a annular rib 37 groove 8 end surface 38 recess 9 projection 39 base body 10 angulation 40 base 11 breakthrough 41 extension 12 Device 42 Extension 13 Upper punch 43 Die 14 Lower punch 43a Mold cavity 15 Stamping member 44 Powder 16 Stamping member 45 Upper punch holder 17 Direction 46 Lower punch holder 18 Pressing surface 47 Bund 19 Shell surface 48 Bundle 20 Rib 49 Bund 21 Base 22 End face 23 Projections 24 Breakthrough 25 End 26 Height 27 Lower punch part 28 lower punched part 29 lower punched part
    权利要求:
    Claims (7)
    [1]
    1. A method for pressing a green compact (1) for producing a sintered molded part from a sintered powder, after which the sintering powder is introduced into a mold cavity (43a) of a matrix (43), and then the sintering powder with at least one stamp, at least partially pressed into the mold cavity (43a), is pressed into the green compact (1), characterized in that, to form an undercut region on the green compact (1), a fraction of the sintering powder is stamped from a first plane of the matrix (43) to form a sintered powder Breakthrough (11) in the first plane in the pressing direction in a second, different from the first plane level of the die (11) is moved.
    [2]
    2. The method according to claim 1, characterized in that the shifted in the second plane portion of the sintering powder is compacted higher than the remaining portion of the sintering powder.
    [3]
    3. The method according to claim 1 or 2, characterized in that the sintering powder is supported at least at the beginning of moving the proportion of Sinterpul¬vers exclusively from below.
    [4]
    4. Device (12) for pressing a green compact (1) from a sintered powder for a sintered shaped part, with a die (43), which has a mold cavity (43a) for receiving the sintering powder to be pressed, and with a Stem¬pel, which has a pressing surface (18) which can be brought into contact with the sintering powder to be pressed, the stamp having at least one first stamp part (15) and at least one second stamp part (16), characterized in that the second stamp part ( 16) projects beyond the pressing surface (18) of the punch toward the mold cavity (43a).
    [5]
    5. Device (12) according to claim 4, characterized in that the second stamp part (16) in the first stamp part (15) is fixed.
    [6]
    6. Device (12) according to claim 4, characterized in that the second punch member (16) relative to the first punch member (15) is adjustable.
    [7]
    A sintered compact having at least one undercut portion, characterized in that the sintered compact is produced by a method according to any one of claims 1 to 3 and the undercut portion is made without machining, the undercut portion having a land and / or projection (9) extending in a first direction, and wherein at one end of the web or the projection (9) an angled portion (10) is formed which extends in a second direction, which is orthogonal to the first direction, and further wherein the sintered molded part at least one breakthrough ( 11) spaced apart from one another in the first direction to the angle (10), wherein the opening (11) in the first direction has a cross-sectional area which is at least approximately the same size and at least approximately the same shape, as the cross-sectional area of the bend (10) in this first direction rachtet.
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    同族专利:
    公开号 | 公开日
    US10646922B2|2020-05-12|
    CN105268967A|2016-01-27|
    US20150367414A1|2015-12-24|
    AT515961B1|2017-04-15|
    DE102015210588A1|2015-12-24|
    CN105268967B|2020-08-21|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50425/2014A|AT515961B1|2014-06-18|2014-06-18|Method and device for pressing a green compact|ATA50425/2014A| AT515961B1|2014-06-18|2014-06-18|Method and device for pressing a green compact|
    US14/726,914| US10646922B2|2014-06-18|2015-06-01|Method and device for pressing a green compact|
    DE102015210588.1A| DE102015210588A1|2014-06-18|2015-06-10|Method and device for pressing a green compact|
    CN201510335288.2A| CN105268967B|2014-06-18|2015-06-17|Method and apparatus for pressing green bodies|
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