• 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 tool (1) for forging a tube (2) from a perforated semi-finished product (3) with a mandrel (4), wherein the mandrel (4) by means of a mandrel bar (35) in the perforated semi-finished product (3) in axial Direction (5) is insertable, wherein the mandrel (4) by means of a radially displaceable mandrel circumference segments (15, 16, 17, 18) variable mandrel outer diameter (25, 26, 27).
    公开号:AT517627A2
    申请号:T405/2016
    申请日:2016-09-01
    公开日:2017-03-15
    发明作者:Paul-Josef Nieschwietz Dr；Frederik Knauf Dr；Steingießer Klaus
    申请人:Sms Group Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a tool for forging a tube from a perforated semi-finished product with a mandrel, wherein the mandrel is insertable by means of a mandrel bar in the perforated semi-finished product in the axial direction.
    The invention also relates to a forming machine, in particular a radial forging machine, with forming tools for forming a perforated semi-finished product to a tube, in which the forming tools in the radial direction of radially outward on the perforated semi-finished deliverable, and with a tool comprising a mandrel, in which the mandrel in the axial direction in the perforated semifinished product is insertable.
    The invention further relates to a method for forging a tube from a perforated semi-finished product, wherein a mandrel of a tool for forging the punched semifinished product is inserted in the axial direction in the perforated semifinished product, and in which the perforated semifinished product at least partially at the axial height of in the perforated semi-finished imported mandrel is processed by a forging tool from the outside, whereby the perforated semi-finished product heats up.
    Tools with a mandrel for insertion into a perforated semi-finished product, such as a hollow block, a billet or the like, are well known in the art. The respective mandrel of these tools is either cylindrical or conical and has a constant, that is, an unchangeable Dornaußendurchmesser. These tools are used in particular in connection with radial forging machines, wherein the mandrel is a counter-stop in the interior of the perforated semifinished product or the tube for the externally applied to the perforated semi-finished product or the pipe forging tools.
    Due to its pronounced and intensive surface contact with the forged tube, the mandrel in particular is subject to an extremely high thermal load, which is caused in particular by the heat introduced into the perforated semifinished product or tube by the forging process. This thermal stress often causes the tube to forge on the mandrel. As a rule, this in turn means that both the tube and the mandrel are destroyed irreversibly.
    The invention has for its object to increase the life of a generic tool.
    The object of the invention is achieved by a tool for forging a tube from a perforated semifinished product with a mandrel, wherein the mandrel by means of a mandrel rod in the perforated semi-finished product can be inserted in the axial direction, and wherein the mandrel has a variable by means of radially displaceable mandrel peripheral segments Dornaußendurchmesser.
    In the present case, the mandrel outside diameter is variably adjustable and adjustable, so that the operative contact between the pipe or the pipe inside of the pipe can be interrupted especially during a forging process, without having to displace the mandrel axially relative to the pipe. As a result, a heat transfer of heat or heat, which arises due to the introduced in the perforated semi-finished forming work in this perforated semi-finished product or in the tube, greatly reduced to the mandrel.
    This makes it possible to significantly reduce the contact time of the active contact between the mandrel and the tube, so that the thermal load is also significantly reduced. This also avoids very well that the pipe and the mandrel are inextricably linked by the forging process, in particular that the tube shrinks on the mandrel. The radially displaceable mandrel circumference segments are preferably configured as quadrant-forming arch elements which extend with their longitudinal extension in the axial direction of the central longitudinal axis of the mandrel and around this central longitudinal axis around a cylindrical outer surface of the mandrel Dorn embroider.
    In this respect, the mandrel on its outer surface or outer pipe contact surface in the present case is preferably cylindrical in shape. Due to the cylindrical shape of the mandrel, tolerances with respect to the inner diameter of the pipe are also less adversely affected than with a conical mandrel. Alternatively, however, a mandrel could basically also comprise a conical outer surface.
    Especially in a radial forging machine four such arc elements or mandrel circumference segments are used, in which case the center of the respective mandrel circumference element is located below the center of the respective radially further outermost associated forging tool.
    It is understood that with appropriately ausgestalteter invention, more than four such arc elements may be present, such as eight arch elements.
    The present mandrel may be stationary with respect to its longitudinal central axis or rotatable about this longitudinal central axis. In the latter case, the rotation control of the mandrel is preferably designed so that the center orientation of each mandrel peripheral segment and the center orientation of the associated forging tool automatically coincide.
    Due to the variability of the Dornaußendurchmessers, which can be achieved for example by means of a wedge adjustment, the outer diameter of the mandrel can be varied within wide ranges.
    This advantageously also allows independent of the other features of the invention that different inner tube diameter can be achieved with a single mandrel. Currently, it is necessary that different sized mandrels are required for the realization of different inner tube diameters.
    Advantageously, in the present case it is possible to dispense with the provision of a plurality of thorns with different diameters, since different pipe diameters can be produced here with a single mandrel.
    In this respect, the use of the present mandrel with variable outer diameter for producing tubes with different inner tube diameter even without the other features of the invention is advantageous.
    In this connection, the object of the invention is furthermore achieved by a method for forging a tube from a perforated semi-finished product, in which a mandrel of a tool for forging the tube is inserted into the perforated semi-finished product in the axial direction, and in which the perforated semi-finished product at least partly at the axial height of the introduced into the perforated semi-finished mandrel by a
    Forging tool is processed from the outside, whereby the tube is heated, wherein the mandrel is temporarily removed during the processing of the tube of a contact heat transfer through the heated tube by the mandrel outer diameter is reduced in the radial direction.
    By reducing the Dornaußendurchmessers immediately after the forming a gap between the mandrel and the perforated semi-finished product or the tube is formed, so that at least no contact-induced heat transfer takes place.
    As a result, the temperature of the mandrel is significantly reduced and the life of the mandrel increases accordingly.
    The contact time between the mandrel and the tube can be procedurally particularly easily reduced if the Dornaußendurchmesser the mandrel is changed after processing of the tube by the forging tool. More specifically, the mandrel outer diameter of the mandrel is reduced thereby.
    In the present case, therefore, the danger is extremely set down, that the tube forges on the mandrel, or vice versa. Thus, the life of the tool or its relevant mandrel is substantially increased.
    Preferably, the mandrel outer diameter of the mandrel is changed after an operative contact of the forging tool with the perforated semi-finished product or tube, for example after each forging stroke.
    In this respect, it is particularly advantageous according to the invention if the mandrel is released from the perforated semifinished product or tube after a forging process, in particular after each forging contact.
    It is advantageous if external forging tools and the radially inward radially displaceable mandrel circumference segments are moved radially offset from one another with time, so that the radially displaceable mandrel circumference segments already abut against the inside of the perforated semi-finished product or the pipe, if the forging tools from the outside on the perforated semifinished product or pipe impinge.
    In the present case, the mandrel is expanded to a working diameter, for example at the time texP = x. An effective contact of the forging tools with the perforated semi-finished product is then preferably at a later time tSChm = x + Δχ, where Δχ is almost arbitrary selectable.
    It is understood that with appropriate design of the invention and the selected procedure but also deviating synchronizations can be selected with respect to the forging tools and the radially displaceable mandrel circumference segments.
    In any case, it is advantageous if a radial movement of radially displaceable mandrel circumference segments is carried out in synchronism with a radial forging movement, since this always provides a perfect counterface during forging in the interior of the perforated semifinished product or of the pipe.
    A special, independent of the other features of the invention process provides that by means of a single mandrel with variable mandrel outer diameter different tubes with different
    Inner tube diameters are produced. As a result, the number of different mandrels can be significantly reduced or mandrels with different, fixed mandrel outer diameters are almost superfluous, since the present mandrel can produce different mandrel outer diameter.
    At this point it should be explained that the axial direction coincides with the longitudinal extent of the mandrel or of the perforated semifinished product or of the tube.
    In this respect, a radial direction in this respect transversely to this longitudinal extent or to the axial direction.
    The perforated semi-finished product is configured, for example, as a hollow block, a billet or the like.
    Because the present tool is introduced, in particular with its mandrel, into the perforated semifinished product, the present tool is essentially an inner tool, the mandrel representing a counterbody against which the wall of the perforated semifinished product or tube is forged, namely by means of radially outwardly arranged forging tools.
    Preferably, these forging tools are used in a forming machine, such as in a radial forging machine.
    In this respect, the object of the invention of a forming machine, in particular a radial forging machine with forging tools for forming a perforated semi-finished product to a tube in which the forging tools in the radial
    Direction of radially outward on the perforated semifinished deliverable, and with a tool comprising a mandrel dissolved, in which the mandrel in the axial direction in the perforated semi-finished product is insertable, wherein the forming machine is characterized by a tool according to one of the features described herein.
    In this way, the costs can be reduced with respect to the forming machine or radial forging machine, since the life of the tool or of the associated mandrel is significantly increased.
    It is particularly expedient if the radially displaceable mandrel circumference segments are arranged to be radially displaceable as a function of a forging movement of the forging tools. As a result, the movements of the forging tools and the radially displaceable mandrel circumference segments can be synchronized well with each other.
    With regard to the tool, it is further advantageous if the mandrel is in a first operating condition with a first mandrel outside diameter in which the radially displaceable mandrel peripheral segments are in operative contact with the inside of the pipe, and another operating condition with a reduced mandrel outside diameter in which the radially displaceable mandrel peripheral segments are arranged radially spaced from this inside. Thus, it is possible constructively in a simple manner to remove the mandrel from the inside of the tube, without the mandrel would necessarily have to be displaced axially.
    In this first operating state, the mandrel with the first mandrel outer diameter thus has a working diameter, so that the mandrel bears against the inside of the wall of the perforated semi-finished product or tube. In this working diameter, the mandrel is ideally clamped against the perforated semi-finished product or tube.
    In at least one further operating condition with a reduced outer mandrel diameter, the mandrel has a park diameter, so that the mandrel is no longer jammed with respect to the pipe, but is ideally non-contact thereto, whereby the mandrel is also easily axially displaceable with respect to the pipe.
    In this respect, a preferred variant of the method also provides that the mandrel outer diameter of the mandrel is reduced after an operative contact of the forging tool with the perforated semi-finished product such that the mandrel with its lateral surface loses all or part of the effective contact with the inside of the perforated semi-finished product. As a result, a critical increase in temperature of the perforated semifinished product or tube can be avoided and thus the risk of forging can be effectively reduced.
    Another very advantageous variant of the method provides that the mandrel outer diameter of the mandrel is reduced after an operative contact of the forging tool with the perforated semi-finished, the mandrel is then displaced in the axial direction relative to the forging tool, and then the mandrel outer diameter of the mandrel is expanded again in the radial direction, such that the mandrel comes into operative contact with the tube with an axially adjacent mandrel peripheral region.
    Due to the fact that the mandrel can alternatively also be displaced axially after a reduction in its mandrel outer diameter, it is advantageously achieved that a first mandrel peripheral region previously stressed by a forging process or several forging processes continues despite the continuation of the forging process, in particular with a perforated hollow block twisted about the longitudinal axis ,
    Pipe, for the time being no longer charged, but seen in the axial direction next lying other mandrel peripheral region of the mandrel. In this way, the service life of the present tool or, in particular, of the associated mandrel can be significantly increased again.
    Conveniently, the smallest adjustable mandrel outer diameter of the mandrel is at least temporarily smaller than the finished dimension of a tube inner diameter of the tube to be forged adjustable. In this way it can be ensured that during a forging process the operative contact between the mandrel and the perforated semifinished product or tube can be interrupted without any problems, whereby the effects and advantages already mentioned above can be achieved.
    In the present case, it is already sufficient if the mandrel outside diameter can be reduced only a few millimeters or tenths of a millimeter, since this can be used, for example, to avoid thermal shrinkage of the perforated semifinished product or of the pipe onto the mandrel during the forging process.
    For example, the difference between the maximum possible mandrel outside diameter of the mandrel and the smallest mandrel outside diameter is only a few millimeters or tenths of a millimeter to achieve the effects described above.
    It is understood that the radial displaceability of the individual radially displaceable mandrel circumference segments can be ensured structurally varied, for example by means of a correspondingly designed pneumatic or hydraulic device.
    A structurally very simple in this respect, but nevertheless extremely reliable method provides that the mandrel has an axially displaceable expander center part, which is mounted axially displaceably on the radially displaceable mandrel peripheral segments in the axial direction.
    In this case, the radially displaceable mandrel circumference segments are arranged radially further outside and concentrically around the expander center part.
    It is understood that a different number of axially displaceable Expandermittenteilen can be provided. The construction of the present tool can be kept very simple if only a single axially displaceable expander center part is present.
    The radial displaceability of the radially displaceable mandrel circumference segments can be realized in a structurally simple manner by means of the expander element, if the axially displaceable expander center part has a conical base body which comprises radially outside axial sliding grooves, in which the radially displaceable mandrel circumference segments are mounted. As an alternative to the axial sliding grooves, other elements can also be provided by means of which the radially displaceable mandrel peripheral segments are guided guided on the axially displaceable expander center part, such as axial sliding webs or the like.
    By means of the conical base body of the expander part, structurally simple, in particular, a wedge adjustment can also be realized.
    The radially displaceable mandrel circumference segments can be kept structurally simple in the axial direction, but can be displaced in the radial direction if the radially displaceable mandrel circumference segments are fixed axially to the mandrel rod in the axial direction but radially movably mounted in the radial direction.
    A radial displaceability of the mandrel circumference segments can also be realized, for example, by sliding grooves or the like.
    In order for the forging tools to be able to interact with the radially displaceable mandrel circumference segments, it is advantageous if the radially displaceable mandrel circumference segments are arranged on the mandrel such that in each case a radially displaceable mandrel circumference segment is arranged opposite a forging tool arranged radially further outward.
    As a rule, after each stroke of the forging tools, ie during forging, the perforated semifinished product or tube is displaced forwards in the direction of the forging tools. In this case, the mandrel can either run along or stand still.
    It should again be mentioned that with the present invention, the engagement between the mandrel and the perforated semi-finished product or tube can be significantly reduced, whereby on the one hand the thermal load of the mandrel is reduced. On the other hand, a forging of the perforated semi-finished or tube is avoided on the mandrel. Overall, thus, the life of the mandrel is significantly increased, which in particular a radial forging machine can be operated much more effectively.
    Further features, effects and advantages of the present invention will be explained with reference to the appended drawing and the following description, in which a tool with a mandrel having a variable mandrel outside diameter is shown and described by way of example, which is used, for example, in a forging tool equipped radial forging machine.
    In the drawing show:
    FIG. 1 schematically shows a side view of a tool with a mandrel, which has a mandrel outer diameter variable by means of four radially displaceable mandrel peripheral segments;
    Figure 2 shows schematically a partially sectioned transverse view of the tool shown in Figure 1 in a radial forging machine with four forging tools arranged radially further out than the mandrel peripheral segments;
    FIG. 3 schematically shows a side view of the tool with the mandrel inserted in a perforated semi-finished product during a forging contact in which the forging tools are lowered onto the perforated semi-finished product, along the section line BD shown in FIG. 2, wherein the mandrel bears against the inside of the perforated semi-finished product has expanded mandrel outer diameter; and
    FIG. 4 schematically shows a further side view of the tool cut along the section line B-D shown in FIG. 2, in which the forging tools are lifted off the perforated semi-finished product, wherein the mandrel has a mandrel outer diameter reduced radially further inward.
    The tool 1, at least partially shown in FIG. 1, for forging a pipe 2 (see FIGS. 3 and 4) from a perforated semifinished product 3 (see also FIGS. 3 and 4) has a mandrel 4 which projects into the perforated semifinished product 3 or pipe 2 can be introduced in the axial direction 5 to support the perforated semi-finished product 3 or tube 2 on its inside 3A from the inside when it is machined from the outside by means of forging tools 6, 7, 8 and 9.
    The forging tools 6 to 9 are in this embodiment components of a radial forging machine 10, not shown here, in which the present tool 1 is used to forge the perforated semi-finished product 3 by means of the forging tools 6, 7, 8 and 9 against the mandrel 4 and As a result, the tube 2 with a finished size, in particular with a required inner tube diameter 2A to manufacture. Instead of a radial forging machine 10 and another forming machine could be used.
    The mandrel 4 extends with its longitudinal extension 11 or with its longitudinal central axis 12 in the axial direction 5, wherein at least during the forging process about this longitudinal central axis 12 around the forging tools 6 to 9 are arranged concentrically.
    The mandrel 4 has a total of four mandrel peripheral segments 15, 16, 17 and 18 (see Figure 2), which configure a cylindrical outer surface 19 of the mandrel 4.
    These four mandrel peripheral segments 15 to 18 are in this case radially displaceable in the radial direction 20, so that the mandrel outer diameter 25 is continuously variable. In other words, the mandrel 4 has a variable outer mandrel diameter 25 which can be varied at least between a park diameter 26 (see FIGS. 1, 2, 4) and a working diameter 27 (see FIG. 3).
    It can thus be said that the mandrel 4, in particular with respect to its variable mandrel outer diameter 25, has a first operating state 28 (see FIG. 3) and at least one further operating state 29 (see FIG. 4).
    According to the exemplary embodiment shown here, the first operating state 28 of the mandrel 4 shown in FIG. 3 describes an expanded mandrel outside diameter 25, namely the working diameter 27, in which the radially displaceable mandrel peripheral segments 15 to 18 with the inside 3A of the perforated semifinished product 3 or, in particular, the tube 2 are in operative contact.
    Accordingly, the illustrated in the Figure 4 further operating state 29 of the mandrel 4 a reduced or contracted Dornaußendurchmesser 25, namely the park diameter 26, in which case the radially displaceable mandrel peripheral segments 15 to 18 of this inner side 3A in particular of the finished forged pipe 2 radially further inside are lifted off.
    Accordingly, the mandrel outer diameter 25 can also be varied so that the smallest adjustable mandrel outer diameter 26 of the mandrel 4 is at least temporarily smaller than the finished dimension of a pipe inner diameter 2A of the pipe 2 to be forged.
    For radial actuation of the four mandrel circumference segments 15, 16, 17 and 18, the present tool 1 comprises a centrally arranged axially displaceable expander center part 30, which is thus axially displaceable along the longitudinal central axis 12.
    In this embodiment shown, the axially displaceable expander center part 30 comprises a conically shaped main body 31 which carries the four mandrel peripheral segments 15, 16, 17 and 18. For this purpose, the conical base body 31 for each of the four mandrel circumference segments 15, 16, 17 and 18 a Axialschiebenut 32 (only exemplified, see Figure 2), in which a compatible formed spring element 33 (also only exemplified, see Figure 2) respective mandrel peripheral segment 15, 16, 17 and 18 is movably mounted.
    Furthermore, the axially displaceable expander center part 30 comprises an actuating rod 34, which is operatively connected to the conically shaped main body 31, so that this conically shaped main body 31 can be operated from further axially outside and positioned almost anywhere within the perforated semifinished product 3 or tube 2 , So also during the actual forging process to load different axial areas of the lateral surface 19 of the mandrel 4 by forging contacts, so that overall the mandrel 4 seen over its longitudinal extent 11 is less partially loaded.
    The four mandrel peripheral segments 15, 16, 17 and 18, however, are in operative connection with one or more further mandrel elements 35 (here only by way of example) so that they can be fixed axially in the axial direction 5 by means of the further mandrel element 35, but nevertheless by means of the axially displaceable expander element 30 in the radial direction 20 can be moved radially.
    This mandrel member 35 may in this case be articulated by means of a hinge 36 to the respective mandrel peripheral segment 15, 16, 17 and 18 respectively.
    So that a smooth movement between the individual four mandrel peripheral segments 15, 16, 17 and 18 can be ensured, the mutually immediately adjacent mandrel peripheral segments 15, 16, 17 and 18 in the circumferential direction 40 of the axially displaceable Expandermittenteils 30 through a gap 41 (only exemplified) spaced apart.
    As shown in FIG. 3, the mandrel 4 is shown in its first operating state 28 during a forging process within a perforated semifinished product 3.
    In this case, the mandrel 4 at a time t = x by means of the four radially displaceable mandrel peripheral segments 15 to 18 radially outwardly expanded to its maximum mandrel outer diameter 27, wherein the four radially displaceable mandrel peripheral segments 15 to 18 relative to the longitudinal center axis 12 by means of the expander member 30th are disengaged maximally radially outward according to the disengaging arrow 42.
    For this purpose, the expander member 30 has been axially displaced according to the axial arrow 43.
    Shortly after the mandrel 4 occupies this working diameter 27, approximately at about the later time ti = x + Δχ, the perforated semi-finished product 3 is forged by the four forging tools 6, 7, 8 and 9 from the outside, and thus the perforated semi-finished product 3 is radially further inwardly forged on the mandrel 4. Here, the forging tools 6, 7, 8 and 9 are moved simultaneously to the perforated semi-finished product 3 according to the forging arrow 44 to the forging contact.
    In order to avoid forging of the tube 2 with the mandrel 4, this working diameter 27 is now reduced by the four radially displaceable mandrel peripheral segments 15 to 18 relative to the longitudinal center axis 12 according to the Einrückpfeils 45 again radially inwardly indented, as shown shown to 4, until the mandrel 4 reaches its park diameter 26. The engagement of the four radially displaceable mandrel circumference segments 15 to 18 takes place here by means of the expander element 30, which is displaced back according to the opposite axial arrow 46. At the same time, all forging tools 6, 7, 8 and 9 undergo a normal return stroke movement in accordance with the return arrow 47.
    By reducing the mandrel outer diameter 25 of the mandrel 4 to the outer dimension of the park diameter 26, the perforated semi-finished product 3 or the tube 2 between two forging strokes freely in the axial direction 5 shifted so are rotated about the Längsmittenlachse 12. Furthermore, the mandrel 4 is significantly less thermally stressed by the heated tube 2 during this period, as a result of which the effects or advantages already described several times are achieved.
    It goes without saying that the exemplary embodiment explained above is only a first embodiment of the tool according to the invention. In this respect, the embodiment of the invention is not limited to this embodiment. All disclosed in the application documents features are claimed as essential to the invention, provided they are new individually or in combination over the prior art.
    LIST OF REFERENCE NUMBERS: 1 tool 2 tube 2A inner tube diameter 3 perforated semi-finished product 3A inner side of the perforated semi-finished product or tube 4 mandrel 5 axial direction 6 first forging tool 7 second forging tool 8 third forging tool 9 fourth forging tool 10 radial forging machine 11 longitudinal extension 12 longitudinal central axis 15 first mandrel peripheral segment 16 second mandrel peripheral segment 17 third Mandrel circumference segment 18 fourth mandrel circumference segment 19 cylindrical outer lateral surface 20 radial direction 25 mandrel outside diameter 26 park diameter 27 working diameter 28 first operating state 29 further operating state 30 axially displaceable expander center part 31 conical main body 32 axial sliding grooves 33 spring elements 34 operating rod 35 mandrel element 36 joint 40 circumferential direction 41 gap 42 disengaging arrow 43 axial arrow 44 forging arrow 45 engagement arrow 46 opposite axial arrow 47 return arrow
    权利要求:
    Claims (14)
    [1]
    claims:
    1. tool (1) for forging a tube (2) from a perforated semi-finished product (3) with a mandrel (4), wherein the mandrel (4) by means of a mandrel rod (35) in the perforated semi-finished product (3) in the axial direction ( 5) is insertable, characterized in that the mandrel (4) by means of a radially displaceable mandrel circumference segments (15, 16, 17, 18) variable Dornaußendurchmesser (25, 26, 27).
    [2]
    2. Tool (1) according to claim 1, characterized in that the mandrel (4) has a first operating state (28) with a first Dornaußendurchmesser (25, 27), in which the radially displaceable mandrel peripheral segments (15, 16, 17, 18). with the inner side (3A) of the tube (2) in operative contact, and another operating state (29) with a reduced mandrel outer diameter (25, 26) in which the radially displaceable mandrel peripheral segments (15, 16, 17, 18) from this inner side (3A) are arranged radially spaced.
    [3]
    3. Tool (1) according to claim 1 or 2, characterized in that the smallest adjustable Dornaußendurchmesser (25, 26) of the mandrel (4) at least temporarily smaller than the finished dimension of a pipe inner diameter (2A) of the pipe to be forge (2) is adjustable ,
    [4]
    4. Tool (1) according to one of claims 1 to 3, characterized in that the mandrel (4) has an axially displaceable expander center part (30) which on the radially displaceable mandrel peripheral segments (15, 16, 17, 18) in the axial direction (5) is mounted axially displaceable.
    [5]
    5. Tool (1) according to claim 4, characterized in that the axially displaceable expander center part (30) has a conical base body (31) which radially outward Axialschiebenuten (32), in which the radially displaceable mandrel circumference segments (15, 16, 17 , 18) are stored.
    [6]
    6. Tool (1) according to one of claims 1 to 5, characterized in that the radially displaceable mandrel circumference segments (15, 16, 17, 18) on the mandrel rod (35) in the axial direction (5) fixed axially, but in the radial direction (20) are mounted radially movable.
    [7]
    7. Tool (1) according to one of claims 1 to 6, characterized in that the radially displaceable mandrel peripheral segments (15, 16, 17, 18) are arranged on the mandrel (4) such that in each case a radially displaceable mandrel peripheral segment (15, 16, 17, 18) a radially further outwardly arranged forging tool (6, 7, 8, 9) is arranged opposite one another.
    [8]
    8. forming machine, in particular radial forging machine (10), with forging tools (6, 7, 8, 9) for forming a perforated semi-finished product (3) to a tube (2), wherein the forging tools (6, 7, 8, 9) in radial direction (20) of radially further out on the perforated semi-finished product (3) are deliverable, and with a tool (1) comprising a mandrel (4), wherein the mandrel (4) in the axial direction (5) in the perforated semifinished product (3) is insertable, characterized by a tool (1) according to one of the preceding claims.
    [9]
    9. forming machine according to claim 8, characterized in that the radially displaceable mandrel circumference segments (15, 16, 17, 18) in dependence of a forging movement of the forging tools (6, 7, 8, 9) are arranged radially displaceable.
    [10]
    10. A method for forging a tube (2) from a perforated semi-finished product (3), wherein a mandrel (4) of a tool (1) for forging the perforated semi-finished product (3) in the axial direction (5) in the perforated semifinished product (3 ) is introduced, and in which the perforated semi-finished product (3) at least partially at the axial height of the introduced into the perforated semi-finished product (3) mandrel (4) by a forging tool (6, 7, 8, 9) is processed from the outside, whereby heated the perforated semi-finished product (3), characterized in that the mandrel (4) during processing of the perforated semifinished product (3) of a contact heat transfer through the heated perforated semi-finished product (3) is temporarily removed by the mandrel outer diameter (25) in the radial direction is reduced.
    [11]
    11. The method according to claim 10, characterized in that the mandrel outer diameter (25) of the mandrel (4) after an operative contact of the forging tool (6, 7, 8, 9) with the perforated semi-finished product (3) is reduced such that the mandrel ( 4) loses with its lateral surface (19) the active contact with the inside (3A) of the tube (2) in whole or in part.
    [12]
    12. The method according to claim 10 and 11, characterized in that the mandrel outer diameter (25) of the mandrel (4) after an operative contact of the forging tool (6, 7, 8, 9) is reduced with the perforated semi-finished product (3), the mandrel ( 4) is then displaced in the axial direction (5) relative to the forging tool (6, 7, 8, 9), and then the mandrel outer diameter of the mandrel (4) is expanded again in the radial direction (20) so that the mandrel (4) with an axially adjacent mandrel peripheral region with the tube (2) comes into operative contact.
    [13]
    13. The method according to any one of claims 10 to 12, characterized in that a radial movement of radially displaceable mandrel peripheral segments (15, 16, 17, 18) in synchronism with a radial forging movement of forging tools (6, 7, 8, 9) is performed.
    [14]
    14. The method according to any one of claims 10 to 13, characterized in that by means of a single mandrel (4) with variable Dornaußendurchmesser (25, 26, 27) different tubes (2) are produced with different inner tube diameters (2A).
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    同族专利:
    公开号 | 公开日
    AT517627B1|2019-02-15|
    AT517627A3|2018-12-15|
    DE102015216965B4|2018-10-25|
    DE102015216965A1|2017-03-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP2521958B2|1987-06-10|1996-08-07|石川島播磨重工業株式会社|Pipe forging equipment|
    AT511748B1|2011-08-12|2014-04-15|Gfm Gmbh|DEVICE FOR FORGING A HOLLOW BODY|CZ309091B6|2019-12-20|2022-01-26|ŠKODA AUTO a.s.|Mandrel for drop forging|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102015216965.0A|DE102015216965B4|2015-09-04|2015-09-04|Tool and method for forging a pipe and forming machine|
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