UPSETTING PRESS AND METHOD FOR UPSETTING OF AN END OF LONGITUDINALLY EXTENDING WORKPIECES

Abstract

In order for upsetting presses to be able to work more effectively and in more energy-optimized manner for upsetting of an end of longitudinally extending workpieces, an upsetting press for upsetting of an end of longitudinally extending workpieces has at least two longitudinally divided dies, having at least two die parts. A first one of the two die parts is disposed on a first die revolver and a second one of the two die parts is disposed on a second die revolver.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

Applicant claims priority under 35 U.S.C. §119 of German Application Nos. 10 2014 004 540.4 and 10 2014 016 522.1 filed Mar. 31, 2014 and Nov. 10, 2014, respectively, the disclosures of which are incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to an upsetting press for upsetting of an end of longitudinally extending workpieces. The upsetting press has at least two longitudinally divided dies, having at least two die parts. The invention also relates to a method for upsetting of an end of longitudinally extending workpieces, which press has at least two longitudinally divided dies, having at least two die parts.

2. Description of the Related Art

Corresponding upsetting presses and methods for upsetting of an end of workpieces that extend longitudinally are known, for example, from DE 32 40 689 A1, from JP 60-3938 A, and from WO 2012/150564 A1.

In DE 32 40 689 A1, in particular, a charging apparatus for manipulation of tubes in an upsetting press having vertically divided dies is described, wherein the dies comprise two engraved parts that lie one on top of the other. To introduce a tube, the end of which is to be pre-upset, into the upper one of the engraved parts, the respective die is opened, so that the tube can be moved into a gap between the two die halves. Subsequently, the die halves close, and an upsetting operation can be carried out. Afterward, the two die halves open again, and the pre-upset tube is moved into the lower one of the engraved parts for finish-upsetting. A new tube can be moved into the upper one of the engraved parts again, for pre-upsetting.

The upsetting machine known from JP 60-3938 A comprises at least two divisible dies, wherein two die halves of the divisible die can be moved, in each instance, along two slanted slide surfaces of a die frame, which surfaces are disposed conically relative to one another, to open and close the divisible die. Closing and opening of the die takes place using clamping cylinders disposed on the die frame. These cylinders are connected to interact with the two die halves of the respective divided die, by way of a suitably configured mechanism, so that the two die halves can be moved translationally along the slide surfaces.

In the upsetting press known from WO 2012/150564 A1, for upsetting of an end of a metal tube, dies provided for this purpose consist of two die halves that can be moved relative to one another. These die halves are mounted in a rotation arm, in each instance, wherein these two rotation arms have a common articulation point. The die halves can be rotated about this common articulation point, so that the two die halves of the dies, in each instance, can be opened or closed.

In general, the known upsetting presses of the stated type often have an overly large construction or they possess an opening and closing mechanism that is susceptible to breakdown or they are too time-intensive with regard to opening and closing, in terms of their function.

SUMMARY OF THE INVENTION

It is an object of the present invention to make available an upsetting press and a method for upsetting of an end of longitudinally extending workpieces, which press and method work more effectively and in more energy-optimized manner.

These and other objects are accomplished by an upsetting press and by a method for upsetting of an end of longitudinally extending workpieces, having the characteristics according to the invention. Further embodiments, which can be advantageous even independent of these characteristics, are found below.

For example, an upsetting press for upsetting of an end of longitudinally extending workpieces, which has at least two longitudinally divided dies having at least two die parts, works more effectively and in more energy-optimized manner if a first one of the two die parts is disposed on a first die revolver and a second one of the two die parts is disposed on a second die revolver.

Because a first one of the two die parts is disposed on a first die revolver and a second one of the two die parts is disposed on a second die revolver, an opening and closing mechanism for the die can be structured with a very simple design and in extraordinarily failure-proof mariner, if suitably configured.

Furthermore, with a suitable configuration, the die parts, even of multiple dies, can be integrated within the upsetting press in an extremely tight construction space. As a result, it is possible to operate the upsetting press equipped in this manner significantly more effectively.

Using the upsetting press or its dies, a plurality of different longitudinally extending workpieces can be machined at their ends. For example, these workpieces are tubes, rods or the like. Drill rod assemblies should be particularly emphasized in this connection, which can be machined or upset only on extremely large upsetting presses having correspondingly structured dies.

In this regard, the present invention specifically relates also to suitably configured drill rod assembly upsetting presses, in other words to correspondingly designed large presses.

In this connection, the die preferably consists of two die halves that can be moved relative to one another. If configured accordingly, however, the die can also consist of multiple die parts of which a die is then composed. In the latter case, in other words in the case of multiple die parts per die, multiple die revolvers can also be provided, but then, however, greater demands are made on a movement and application mechanism, with regard to the individual dies.

Furthermore, on the basis of the present advantageous design of the respective die, if suitably designed, can be opened and closed very easily in terms of process technology.

In this regard, a method for upsetting of an end of longitudinally extending workpieces in an upsetting press, which has at least two longitudinally divided dies, having at least two die parts, works more effectively and in more energy-optimized manner if the respective die parts of the two dies are alternately displaced into an upsetting position and into a readiness position.

It is advantageous if the respective alternately displaced die parts of the two dies are moved synchronously to one another, thereby making it possible to open and close the individual dyes significantly more quickly.

This advantage relates not only to the die parts belonging to a die, which are rotated using at least two die revolvers, if applicable at the same time, and to the die parts that are carried by the respective die revolver and alternately displaced.

Particularly simple control can be achieved, in this connection, if two first die parts of the two dies and/or two second die parts of the two dies are simultaneously displaced, in each instance, between the upsetting position and the readiness position. Preferably, simultaneous displacement takes place with the identical path progression, in each instance, which can be implemented in particularly space-saving and structurally simple manner.

An identical path progression, in this regard, can be implemented in simple manner in the present case if the two die parts are disposed on a rigid body, for example on a die revolver, but separate control is also conceivable.

It is furthermore advantageous if the displacement between upsetting position and readiness position takes place during a single heat and that an upsetting procedure is carried out with each of the dies in the upsetting position. In this way, a multi-stage upsetting procedure that is very effective in terms of energy is possible, which procedure draws optimal benefit from the rapid die change.

The description “during one or during a single heat” means, in the sense of the invention, that the workpiece does not need to be or is not reheated or repositioned between two upsetting procedures.

In this regard, repositioning of the workpiece out of a workpiece working position, in particular, becomes superfluous. As a result, it is possible to shorten the present upsetting method, on the one hand, and to carry it out in more energy-saving manner, on the other hand.

A method variant that leads further provides that the displacement takes place by means of rotation of the die revolvers in the same direction and/or in opposite directions. In this connection, rotation as such already has the advantage that it can generally be carried out quickly and operationally reliably, even in the case of heavy components, and therefore also in the case of the heavy dies of a large press.

For example, in the case of a suitable design, rotation in the same direction allows a very rapid change of two dies, the die parts of which lie opposite one another, in each instance, because these die parts then move toward one another immediately or move away from one another immediately.

Rotation in opposite directions, in contrast, in the case of a suitable design, allows engagement of respective projections into one another, which projections are formed by the die parts, for example, so that these projections can be moved past one another, whereby the latter, if applicable, particularly in the case of very complex die revolvers and in special cases, for example if three or more die parts are disposed on a die revolver, can also be made possible by means of displacement of at least one of the die revolvers from a working position into an adjustment position, in which the die revolvers do not hinder one another.

Furthermore, it is advantageous if the two first die parts are disposed on the first die revolver and the two second die parts are disposed on the second die revolver so as to open toward one another, in each instance. In this way, the two respective die parts that form a die can be opened and closed in a simple design and quickly.

If each of the die parts of a die faces the other in an upsetting position of the two die revolvers, which position belongs to this die, then each of the dies can be closed or opened in simple manner, in each instance.

A very advantageous embodiment variant provides that the longitudinal division of the dies takes place in a plane that does not intersect the rotation axles of the respective die revolvers.

If the longitudinal division of the dies takes place in a plane that does not intersect the rotation axles of the respective die revolvers, the working forces that occur at the respective die can be compensated significantly better. In this regard, it is advantageous if the rotation axle of the respective die revolver is disposed outside of a division plane formulated by the longitudinal division of this die revolver.

Furthermore, if the respective die part is disposed on the same side of the plane as the related rotation axle of the related die revolver, the risk that the die parts project outward so far that reciprocal hindering of the die revolvers that lie directly next to one another takes place during a die change can be minimized. In this way, very operationally reliable closing and opening of the dies, with a simple design, is possible.

Both the design structure and the method management can be simplified, in the present case, if the two die revolvers are disposed on rotation axles that are parallel to one another.

It is practical if at least one die part, in each instance, of a third longitudinally divided die is disposed on the two die revolvers. In this way, the advantage of a significantly faster and more precise die change to a third die results, even if it possibly takes a little longer than the direct change between the first and the second die, or even if a die change to this third die possibly can no longer take place during one heat. It is understood that if necessary, further die parts of further longitudinally divided dies can be provided on the die revolvers, if there is sufficient room for this purpose.

A corresponding die change can be implemented in structurally simple manner if pairs of die parts that open toward one another are disposed on the two die revolvers, in each instance.

Furthermore, it is advantageous if at least one of the two, preferably both die revolvers can be displaced axially and/or radially between a working position and an adjustment position. It is advantageous if, on the one hand, the different dies can be disposed freely relative to one another in the adjustment position, if the die revolvers reciprocally hinder one another in the working position and completely free rotation is not possible.

On the other hand, in a suitable design, free rotation, for example in that—as in the case of gear wheels, for example—the projections caused by the respective die parts and the setbacks left between the die parts engage into one another, while the two die revolvers rotate in opposite directions. This arrangement, however, seems to work only so long as no workpiece is in its working position and rotation is thereby prevented. If necessary, an adjustment position is also practical for such a die change.

In particularly in connection with large presses, it is advantageous if the upsetting press is in a reclining position and/or that a traverse, preferably a loose traverse of the upsetting press, passes through the workpiece during pressing or in a pressing position.

The present upsetting press can advantageously be developed further if the upsetting press has a centered tube clamp preferably having at least three clamping jaws that can be braced relative to one another, which are or can be particularly braced by way of a wedge bracing unit. Using this centered tube clamp, the longitudinally extending workpieces can be positioned well, so that the two die parts that form a die can advantageously be rotated along path curves, on both sides of a longitudinally extending workpiece, via the die revolvers.

These path curves preferably intersect in the region of the pressing position or upsetting position.

It is understood that the characteristics of the solutions described above and in the claims can also be combined, if applicable, in order to be able to implement the advantages cumulatively, accordingly.

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages, goals, and properties of the present invention will be explained using the following description of exemplary embodiments, which are particularly shown also in the attached drawing. The drawing shows:

FIG. 1 is a schematic side view of an upsetting press having a first die part belonging to a die, attached to a first die revolver, and having a second die part belonging to this die, attached to a second die revolver;

FIG. 2 is a schematic view of the arrangement according to FIG. 1, in section A-A of FIG. 1;

FIG. 3 shows a similar arrangement according to FIG. 1, of a further upsetting press, in a representation similar to that of FIG. 2; and

FIG. 4 shows a further upsetting press in a representation similar to that of FIGS. 2 and 3.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The upsetting press 1 shown as an example in FIGS. 1 and 2 is suitable for upsetting of longitudinally extending workpieces 2, such as, for example tubes 4 that embody a drill rod assembly 3.

The upsetting press 1 possesses a floor support unit 5 having transverse support elements 7 (numbered only as an example) set into a ground 6, so that the upsetting press 1 as a whole is firmly connected with this ground 6.

This floor support unit 5 in turn carries a fixed traverse 8, on the one hand, and a loose traverse 9, on the other hand, between which four tie rods 10 (numbered only as an example), in total, are disposed. The fixed traverse 8 and the loose traverse 9 are connected with one another by means of these tie rods 10, in this regard.

On the side 11 of the loose traverse 9, there is a centered tube clamping unit 16 for clamping the longitudinally extending workpiece 2, which unit comprises three clamping jaws 17 that can be braced relative to one another, which jaws in turn can be braced against the longitudinally extending workpiece 2 by means of a wedge bracing device 18. Large tubes 4 of drill rod assemblies 3 or the like, especially, can be clamped and held in operationally reliable manner during the upsetting process, by means of the tube clamping unit 16.

Furthermore, a die arrangement 20, which comprises four longitudinally divided dies 21 (see FIG. 2 as an example), in total, is situated on the side 11.

For opening or closing these dies 21, two die revolvers 22 and 23 are provided on the die arrangement 20, wherein the first die revolver 22 rotates about a first rotation axle 24 and the second die revolver 23 rotates about a second rotation axle 25.

The two rotation axles 24 and 25 align with one another in this exemplary embodiment, but the two rotation axles 24 and 25 can also be disposed differently.

These two die revolvers 22 and 23 are driven by a drive motor 26, which is connected to interact with the two die revolvers 22 and 23 or their rotation axles 24 and 25 by means of a synchronization gear mechanism 27, in such a manner that the two die revolvers 22 and 23 can rotate asynchronously or synchronously relative to one another, in order to open or close the respective die 21 in the region (pressing position 45) of the longitudinally extending workpiece 2.

Each of the longitudinally divided dies 21 is composed, in each instance, of two upsetting shells (not specifically numbered) or die parts 22.1 and 23.1 or 22.2 and 23.2 or 22.3 and 23.3 or 22.4 and 23.4, respectively (see FIG. 2), where the first die parts 22.1, 22.2, 22.3, and 22.4, in each instance, are configured by a rotation body (not specifically numbered) of the first die revolver 22, and the second die parts 23.1, 23.2, 23.3, and 23.4, in each instance, are configured by the likewise rotation body of the second die revolver 23. In other words: The first of the four dies 21 of the die arrangement 20 is composed of a first die pair consisting of the die parts 22.1 and 23.1. Accordingly, the second of the four dies 21 of the die arrangement 20 is composed of a second die pair consisting of the die parts 22.2 and 23.2. The third of the four dies 21 of the die arrangement 20 is composed of a third die pair consisting of the die parts 22.3 and 23.3. And the fourth of the four dies 21 of the die arrangement 20 is composed of a fourth die pair consisting of the die parts 22.4 and 23.4. Therefore, the first die part 22.1, 22.2, 22.3, and 22.4, in each instance, is disposed on the first die revolver 22, and the second die part 23.1, 23.2, 23.3, and 23.4, in each instance, is disposed on the second die revolver 23.

While essentially the die arrangement 20 with its components, the drive motor 26, the longitudinally extending workpiece 2, and the tube clamping unit 16 for it are now disposed on the first side 11, a die frame arrangement 36 comprising at least one die frame 37 as well as die frame cylinders 38 for it, and furthermore, a press mandrel 39 and a press cylinder unit 40 for it are disposed on the side 35 of the fixed traverse 8.

The die frame 37 can be moved in the application direction 41, toward the die arrangement 20, or back, by means of the die frame cylinders 38.

The die frame 37 holds the closed die 21, in each instance, which is situated in the pressing/upsetting position 45 (see FIG. 2), in each instance, in which die an end (2A) of the workpiece 2 situated in the working position 46 is disposed, and encloses it in such a manner that during an upsetting procedure, the two respective die pairs remain firmly connected with one another. In this regard, in this pressing or upsetting position 45, corresponding upsetting forces acting on the die parts 22.1-23.1, 22.2-23.2, 22.3-23.3, or 22.4-23.4 are well absorbed by the die frame 27, so that the die arrangement 20 is under less stress, accordingly.

The actual upsetting procedure takes place in known manner, by means of the press cylinder unit 40, which drives the press mandrel 39 through the die frame 37 all the way to the workpiece 2, which is situated in the pressing position 45, and drives the die frame 37, together with the die frame cylinders 38, in the application direction 41, in order to upset the end of the workpiece 2 that is clamped in the tube clamping unit 16. It is understood that here, in deviating embodiments, other pressing sequences, particularly also without the pressing mandrel 39, are conceivable.

The components of the die frame arrangement 36 are mounted on a longitudinal guide traverse 47, so as to be displaceable relative to the components of the die arrangement 20.

These die revolvers 22, 23 hold the four upsetting dies referred to as dies 21 in this exemplary embodiment, in each instance, as is particularly evident in FIG. 2.

By rotating the die revolvers 22, 23 about their respective axle of rotation 24 or 25, the upsetting shells or die parts 22.1, 22.2, 22.3, 22.4 and 23.1, 23.2, 23.3, 23.4, being conveyed, in each instance, can be brought together to form a closed die 21.

In this connection, the respective longitudinal division of the dies 21 situated in the pressing or upsetting position 45, in each instance, takes place in a plane 50, which does not intersect the rotation axles 24 and 25 of the respective die revolvers 22 and 23.

Furthermore, the respective die part 22.1, 22.2, 22.3, 22.4 of the first die revolver 22, situated in the pressing position or starting position 46, is disposed on a first side 51 of the plane 50, on which the rotation axle 24 of the first die revolver 22 is situated. Accordingly, the respective die part 23.1, 23.2, 23.3, 23.4 situated in the pressing position 45 is situated on a second side 52, namely the same side of the plane 50 on which the related rotation axle 25 of the related die revolver 23 is disposed.

Because of the opposite placement of the die parts 22.1-22.2, 22.3-22.4 or 23.1-23.2, 23.3-23.4, opening toward one another, in each instance, the tube center of the tube 4 to be upset is not intersected during the change from the first upsetting procedure to the second upsetting procedure. In this way, double upsetting during one heat is easily possible, in advantageous manner.

To change between the individual dies 21, the die revolvers 22 and 23 are rotated in the same direction about the respective rotation axle 24 or 25.

By means of rotation of the die revolvers 22, 23 in opposite directions, a change between the two dies 21 formed by the die parts 22.1, 23.1 and 22.2-23.2 and the two dies 21 formed by the die parts 22.3, 23.3 and 22.4, 23.4 can take place, but this change is then only possible without a workpiece 2 or in a corresponding adjustment position, because the projections of the die revolver 22, 23, which carry the die parts 22.1, 22.2, 22.3, 22.4, 23.1, 23.2, 23.3, 23.4, engaging into one another like gear wheels, must be guided past one another and past the position in which the workpiece is clamped.

In this connection, corresponding control of the die revolvers 22 and 23 must be observed, so that these die revolvers do not undesirably touch one another during a rotation.

If this control is not possible in an embodiment, or if a die change between the dies 21 is to take place, while a tube 4 is already situated in its working position 46, the die revolvers 22 and 23 can also be displaced, if necessary, in the case of a corresponding design of the die arrangement 20, into an adjustment position (not shown here), where then, for example, at least one of the die revolvers 22 or 23 is axially displaceable in the direction of the rotation axle 24 or 25. If necessary, this expedient can also be achieved using an overall displacement of one of the rotation axles 24 or 25.

In this connection, it is also possible, in the case of a corresponding design, that both die revolvers 22 and 23 or both rotation axles 24 and 25 are mounted so as to be axially displaceable in the longitudinal expanse of the upsetting press, similar to the die frame with regard to the application direction 41, or vice versa.

While the two die parts 22.1 and 23.1 are already in the pressing position or upsetting position 45 (see die part 23.1) or just ahead of it (see die part 22.1) in FIG. 2, for forming or closing a die 21, the remaining die parts 22.2, 22.3, 22.4 and 23.2, 23.3, 23.4 are disposed in the readiness positions 53 (numbered only as an example). In this way, a very rapid die change takes place.

The further alternative upsetting press 101 shown in FIG. 3 and in a cross-sectional representation has essentially the same structure—with the exception of the other first and second die revolvers 122 and 123—as the upsetting press 1 shown in FIGS. 1 and 2, so that with regard to the design and the function, reference is made to the above description, in order to avoid repetition. In this regard, the same reference symbols are used for the same components.

The two die revolvers 122 and 123 also possess rotation bodies (not numbered specifically) here, but these rotation bodies form or carry only two die parts 122.1 and 122.2 or 123.1 and 123.2, in each instance. In this connection, the die parts 122.1, 123.1 and 122.2, 123.2 can form a die 121 once again, by means of suitable rotation of the die revolvers 122 and 123, in the pressing position or upsetting position 45, in each instance. In this exemplary embodiment, however, corresponding control of the die revolvers 122 and 123 must be observed, so that these die revolvers do not undesirably touch one another during a rotation. The die parts 122.1 and 122.2 as well as 123.1 and 123.2 are characterized, in each instance, by an opposite arrangement, in which they open toward one another. In this connection, the two rotation axles 24 and 25 of the two die revolvers 122 and 123 lie vertically one on top of the other and not horizontally next to one another.

Similar to the upsetting presses 1 and 101 shown in FIGS. 1, 2, and 3, the further upsetting press 201 shown in FIG. 4, in a cross-sectional representation, is characterized by essentially the same structure—except for first and second die revolvers 222 and 223 which are configured differently once again. In this regard, reference is made to the above description.

In this connection, the die revolvers 222 and 223 carry or configure two die parts 222.1 and 222.2 or 223.1 and 223.2, in each instance, but these die revolvers 222 and 223 are structured with rotation symmetry, thereby resulting in more complex control of the two die revolvers 222 and 223 with regard to opening and closing of the dies 221 (only numbered as an example), and a die change is not possible during one heat or only in an adjustment position in which the die revolvers 222, 223 are displaced and then rotated accordingly. Also, the die revolvers 222, 223, which actually have a very simple structure, cannot be simply rotated synchronously, but rather must be controlled in complex manner, in order to be able to perform a die change, unless they are separated from one another by way of at least one adjustment position, so that they can rotate independent of one another.

In this exemplary embodiment, as well, the die parts 222.1 223.1 and 222.2, 223.2 again form a die 221, in each instance, by means of suitable rotation of the die revolvers 222 and 223 in the pressing position or upsetting position 45.

The adjustment position can be defined, for example, by means of an axial displacement of both or only one of the die revolvers 22, 23, 122, 123, 222, 223. Likewise, the adjustment position can be defined, if applicable, in that the rotation axles 24, 25 are displaced radially, in other words perpendicular to their expanse, particularly in order to prevent engagement of the die revolvers 22, 23, 122, 123, 222, 223 into one another during the rotation. If more complex rotational movements are possible, it is possible to eliminate a separate adjustment position.

The upsetting presses 1, 101, and 201 shown in FIGS. 1 to 4 all serve particularly for upsetting of ends of drill rod assemblies. In this regard, these upsetting presses 1, 101, and 201 can preferably also be viewed specifically as drill rod assembly upsetting presses.

It is understood that the exemplary embodiments described above are merely first embodiments of the upsetting press 1, 101 or 201 according to the invention. In this regard, the embodiment of the invention is not restricted to these exemplary embodiments.

Thus, although only a few embodiments of the present invention have been shown and described, it is to be understood that many changes and modifications may be made thereunto without departing from the spirit and scope of the invention.

Claims

1. An upsetting press for upsetting of an end of a longitudinally extending workpiece, comprising:

(a) at least first and second longitudinally divided dies, each die having at least first and second die parts; and

(b) a first die revolver and a second die revolver;

wherein each of the first die parts are disposed on the first die revolver and each of the second die parts are disposed on the second die revolver.

2. The upsetting press according to claim 1, wherein the first die parts are disposed on the first die revolver and the second die parts are disposed on the second die revolver so as to open toward one another, in each instance.

3. The upsetting press according to claim 1, wherein the first die part of the first die faces the second die part of the first die in an upsetting position of the first die revolver and the first die part of the second die faces the second die part of the second die in an upsetting position of the second die revolver.

4. The upsetting press according to claim 1, wherein the dies are longitudinally divided in a plane that does not intersect first and second rotation axles of the respective first and second die revolvers.

5. The upsetting press according to claim 4, wherein each of the first die parts is disposed on a first side of the plane where the first rotation axle of the first die revolver is disposed and each of the second die parts is disposed on a second side of the plane where the second rotation axle of the second die revolver is disposed.

6. The upsetting press according to claim 1, wherein the first and second die revolvers are disposed on rotation axles that are parallel to one another.

7. The upsetting press according to claim 1, wherein at least a first die part of a third longitudinally divided die is disposed on the first die revolver and at least a second die part of the third longitudinally divided die is disposed on the second die revolver.

8. The upsetting press according to claim 7, wherein the first and second die parts are disposed in pairs that open toward one another, in each instance, on the first and second die revolvers.

9. The upsetting press according to claim 1, wherein at least the first die revolver is displaceable in at least one of an axial direction and a radial direction between a working position and an adjustment position.

10. The upsetting press according to claim 1, wherein both the first and second die revolvers are displaceable in at least one of an axial direction and a radial direction between a working position and an adjustment position.

11. An upsetting method for upsetting of an end of a longitudinally extending workpiece in an upsetting press comprising at least first and second longitudinally divided dies, each die having at least first and second die parts, said method comprising:

(a) disposing the workpiece in the upsetting press; and

(b) alternately displacing the first and second die parts of the first and second longitudinally divided dies into an upsetting position and into a readiness position.

12. The upsetting method according to claim 11, wherein the first die parts of the first and second longitudinally divided dies or the second die parts of the first and second longitudinally divided dies are displaced simultaneously, in each instance, between the upsetting position and the readiness position.

13. The upsetting method according to claim 12, wherein both the first and second die parts of the first and second longitudinally divided dies are displaced simultaneously between the upsetting position and the readiness position.

14. The upsetting method according to claim 12, wherein displacement takes place with an identical path progression, in each instance.

15. The upsetting method according to claim 11, wherein displacement between the upsetting position and the readiness position takes place during one heat, and an upsetting procedure is carried out with each of the first and second longitudinally divided dies in the upsetting position.

16. The upsetting method according to claim 11, wherein displacement takes place by at least one of rotation in a same direction and rotation in an opposite direction of the first and second die revolvers.

17. The upsetting method according to claim 11, wherein the upsetting press is in a reclining position or wherein a traverse passes through the workpiece during pressing or in a pressing position.

18. The method according to claim 17, wherein the traverse is a loose traverse of the upsetting press.

19. The upsetting press according to claim 1, further comprising a centered tube clamp having at least three clamping jaws that can be braced relative to one another, and a wedge bracing unit for bracing the at least three clamping jaws relative to one another.