Method and machine device for producing contour on plastically deformable workpiece by axial shaping

Abstract

The invention relates to a method and a machine device for producing a contour on a plastically deformable workpiece by axial shaping. In a frame of a method for producing a contour on a plastically deformable, preferably cylindrical workpiece (2) by axial shaping, a relative movement of a shaping tool contour provided on a shaping tool and the workpiece (2) to be shaped is carried out in a shaping process in order to produce a workpiece-side contour having a workpiece-side contour length (L). In the relative movement of the shaping tool contour and the workpiece (2) to be shaped, the shaping tool contour and the workpiece (2) to be shaped produce an oscillatory relative movement in which a shaping stroke and a return stroke opposite the shaping stroke are alternately carried out. The current shaping process varies with respect to oscillatory relative movement. The machine arrangement (100) is configured for carrying out the above method.

Description

Technical Field

[0001] This invention relates to a method for producing a workpiece side profile on a plastically deformable, preferably cylindrical, workpiece by axial forming.

[0002] • In this process, a forming process is performed, during which the relative movement between the forming tool contour set on the forming tool and the workpiece to be formed is implemented to generate a workpiece side contour with the length of the workpiece side contour.

[0003] • Among them, in the current forming process

[0004] - An oscillating relative motion is implemented between the shaping tool contour and the workpiece to be formed during the relative motion of the shaping tool contour and the workpiece to be formed. During this oscillating relative motion, the forming stroke and the return stroke in the opposite direction of the forming stroke are alternately implemented.

[0005] - During the forming stroke of the oscillating relative motion, the shaping tool profile produces a workpiece side profile on the workpiece with a partial length of the workpiece side profile length, and

[0006] - In the return stroke of the oscillating relative motion, at least a portion of the length of the shaping tool profile generated in the previous forming stroke along the length of the workpiece side profile is moved.

[0007] The present invention also relates to a machine apparatus for producing a workpiece side profile on a plastically deformable, preferably cylindrical, workpiece by axial forming, comprising a forming machine having a forming drive configured to implement relative movement between a shaping tool profile disposed on a shaping tool of the forming machine and the preferably cylindrical workpiece to be formed during the forming process, thereby producing a workpiece side profile having a workpiece side profile length.

[0008] • A programmable digital drive control device is provided for the forming drive device. This drive control device is configured to control the forming drive device by storing control parameters. Based on these control parameters, in the current forming process, an oscillating relative motion is implemented between the forming tool contour and the workpiece to be formed, alternating between the forming stroke and a return stroke in the opposite direction of the forming stroke.

[0009] • In the forming stroke of oscillating relative motion, the shaping tool profile generates a workpiece side profile on the workpiece with a partial length of the workpiece side profile length, and

[0010] • In the return stroke of the oscillating relative motion, at least a portion of the length of the shaping tool profile generated in the previous forming stroke along the length of the workpiece side profile is moved.

[0011] Axial forming is a type of extrusion molding method. In extrusion molding, a forming tool applies a compressive force to the workpiece to be formed, the magnitude of which is determined to exceed the yield point of the workpiece material. For this purpose, the forming tool and the workpiece to be formed apply feed forces to each other. Background Technology

[0012] DE19735486A1 discloses this type of prior art.

[0013] In the prior art, the workpiece to be formed and the forming die seated on the workpiece move relative to each other along the feed axis. Due to the impact of the forming die on the workpiece, the workpiece material begins to flow and, during the axial relative movement—that is, during the relative movement of the forming die and the workpiece along the feed axis—the workpiece is formed by the forming die. The relative movement of the forming die and the workpiece is implemented as a non-uniform motion. A frequency control device causes the forming die and the workpiece to undergo an oscillating relative motion, in which they alternately approach and move away from each other until the workpiece is formed at a predetermined forming length. The parameters of the oscillating forming motion are determined before the forming process begins and remain unchanged during the forming process. Summary of the Invention

[0014] The objective of this invention is to provide a method and a machine apparatus by which better processing results can be achieved than those of the prior art.

[0015] According to the present invention, the task can be accomplished by the method according to a preferred embodiment and the machine apparatus according to a preferred embodiment.

[0016] Therefore, in the case of this invention, the current forming process (or molding process) varies in terms of the oscillating relative motion of the shaping tool profile and the workpiece to be formed. The machine apparatus of this invention is equipped with a drive control device that correspondingly controls the relative motion of the shaping tool and the workpiece in the current forming process, wherein the shaping tool, or rather the shaping tool profile, is moved relative to each other during the current forming process by means of the forming drive device. In some cases, the manner in which the current forming process varies in terms of the oscillating relative motion of the shaping tool profile and the workpiece to be formed can be determined before the forming process, particularly based on experience.

[0017] The workpiece to be processed is preferably cylindrical, and can be hollow or solid. This invention is particularly applicable to the automotive industry, for example, for manufacturing shafts for automotive drive systems.

[0018] Other alternative technical solutions to the method and the machine apparatus according to the invention are derived from extended solutions.

[0019] In the machine method according to the invention, the current forming process is controlled by a programmable numerical control device. Control parameters are stored in this numerical control device, and based on these parameters, the current forming process is modified in terms of the oscillating relative motion between the shaping tool profile and the workpiece to be formed, according to their respective applications.

[0020] In a preferred embodiment of the method according to the invention, the above-described forming process follows the prior forming process as a further forming process. An oscillating relative motion between the shaping tool profile and the workpiece to be formed is performed within the framework of the prior forming process. Within the framework of the invention, the same or similar shaping tool can generally be used for both the prior forming process and the further forming process.

[0021] If the actual geometry of the workpiece side profile produced in the initial forming process deviates from the expected geometry of the workpiece side profile, the current further forming process alters the oscillating relative motion between the forming tool profile and the workpiece to be formed, thereby ensuring that the actual geometry of the workpiece side profile produced as a result of the further forming process at least approximates the target geometry of the workpiece to be formed. Ideally, the changes made in the current further forming process regarding the oscillating relative motion between the forming tool profile and the workpiece to be formed will cause the actual geometry of the workpiece side profile produced in the further forming process to conform to the target geometry of the workpiece side profile.

[0022] Accordingly, the drive control device of the machine apparatus for performing the above method provided by the present invention is designed to store control parameters of the forming process, based on which the oscillating relative motion of the shaping tool profile and the workpiece to be formed is varied in the current further forming process, based on which the actual geometry of the workpiece side profile generated in the forming process is consistent with or at least close to the target geometry of the workpiece side profile.

[0023] According to an alternative embodiment, in a further development of the method according to the invention, both the pre-forming process and the post-forming process are digitally controlled in terms of the oscillating relative motion between the shaping tool profile and the workpiece to be formed. The control parameters of the post-forming process are defined such that changes in the oscillating relative motion between the shaping tool profile and the workpiece to be formed in the post-forming process at least largely eliminate the deviation between the actual geometry and the target geometry of the workpiece side profile after the pre-forming process.

[0024] Determine the deviation between the actual geometry and the target geometry of the workpiece side profile after the initial forming process, and then, based on this, determine the variation parameters of the oscillating relative motion between the shaping tool profile and the workpiece to be formed in the current subsequent forming process, for example, based on experience.

[0025] In a preferred embodiment of the invention, in conjunction with the prior forming process, the workpiece side profile generated in the prior forming process is measured in order to empirically determine adaptive adjustments to the oscillating relative motion of the shaping tool and the workpiece to be formed in the current subsequent forming process, and then the actual geometry of the workpiece side profile generated in the prior forming process determined in this way is compared with the desired target geometry.

[0026] According to an extension, in this invention, the prior art forming process is unified in terms of the oscillating relative motion between the forming tool profile and the workpiece to be formed.

[0027] Alternatively, in another extension of the invention, the current in-line forming process also varies in terms of the oscillating relative motion between the forming tool profile and the workpiece to be formed. In this case, the variation in the oscillating relative motion between the forming tool profile and the workpiece to be formed in the current post-forming process differs from the variation in the current pre-forming process.

[0028] According to the invention, a workpiece that has already been processed in a prior forming process can be further processed in a subsequent or further forming process. Alternatively, in a preferred variant of the method according to the invention, the prior forming process is performed as a trial forming process on a test workpiece, while the subsequent forming process is performed as a production process, wherein the workpiece side profile is produced on a workpiece of the same type as the test workpiece of the forming process, preferably from the same batch as the test workpiece.

[0029] In another preferred variant of the invention, the method and machine apparatus according to the invention are designed to produce workpiece side teeth, wherein the workpiece side teeth may be, for example, spur teeth or helical teeth, such as teeth having a helical orientation.

[0030] According to the present invention, external or internal teeth can be produced through a corresponding design of the machine device. According to the present invention, the shaping tool for producing external teeth is, for example, a forming die that fits onto the workpiece to be formed. The workpiece can be solid or hollow. According to the present invention, internal teeth can be produced by a forming punch that engages with the side cavity wall of the workpiece.

[0031] When generating the workpiece side teeth, the actual geometry of the workpiece side profile actually generated in the previous forming process, or the simulated actual geometry of the simulated workpiece side profile, is compared with the target geometry of the workpiece side profile. Preferably, this is done by comparing the actual and target angular positions of the tooth surface lines and / or the actual and target shapes of the tooth surface lines. The total tooth surface line deviation can then be determined based on the tooth surface line angular deviation and / or tooth surface line shape deviation. The total tooth surface line deviation can be used to determine how subsequent forming processes or simulated forming processes vary in terms of the oscillating relative motion between the shaped tooth profile and the workpiece to be formed, thereby obtaining a machining result with the desired tooth geometry on the workpiece.

[0032] In an advantageous embodiment of the method according to the invention, the variation in the oscillating relative motion of the shaping tool profile and the workpiece to be formed in the current forming process and, if necessary, in the current prior forming process, is based on the process-related characteristics of the workpiece to be formed and therefore on the workpiece.

[0033] Experience shows that one factor significantly influencing the processing outcome of the forming process of the present invention is the stiffness of the workpiece to be formed, thus representing a characteristic of the workpiece particularly relevant to the process. Therefore, in a preferred embodiment of the invention, the current forming process, and if necessary, the prior forming process, varies the oscillating relative motion of the forming tool profile and the workpiece to be formed according to the stiffness of the workpiece. The stiffness of the workpiece to be formed is determined, for example, by the material and / or geometry of the workpiece. For example, for a workpiece designed as a hollow body, the workpiece stiffness depends primarily on the workpiece wall thickness and / or whether the workpiece has blind holes or continuous cavities.

[0034] The material of the workpiece to be formed may be process-dependent but not workpiece stiffness. In this invention, it can cause application-related changes to the current forming process, and if applicable, it can also cause application-related changes to the prior forming process in terms of oscillating relative motion. For example, the material of the workpiece to be formed affects the friction ratio between the shaping tool profile and the workpiece during relative motion, the purpose of which is to generate the workpiece side profile.

[0035] The properties of the workpiece to be formed may vary in different regions. For example, this may be related to differences in residual stress or microstructure, which can be attributed to the production method of the workpiece blank. In this invention, by changing the oscillating relative motion between the shaping tool profile and the workpiece to be formed, particularly in the current forming process, and possibly in the current prior forming process, and by empirically determining the oscillating relative motion between the shaping tool profile and the workpiece to be formed, deviations between the actual geometry and the target geometry of the workpiece side profile caused by these conditions can also be avoided.

[0036] According to the invention, in addition to changes related to the workpiece, variations can also be made in the oscillating relative motion between the shaping tool profile and the workpiece to be formed in the current forming process and, if necessary, in the prior forming process, depending on the forming technique parameters. For example, such forming technique parameters are the lubricant applied to the workpiece to be formed in the current forming process and, if necessary, in the prior forming process.

[0037] According to the present invention, some alternative technical solutions provide an oscillating relative motion for changing the current forming process and possibly the current pre-forming process of the shaping tool profile and the workpiece to be formed.

[0038] In a further development of the invention, the forming stroke and / or return stroke and / or the frequency of the oscillating relative motion between the forming tool profile and the workpiece to be formed are varied in the current forming process, and, if appropriate, also in the current prior forming process.

[0039] According to a variation of the method of the present invention, current forming processes and (if applicable) prior forming processes modify the oscillating relative motion of the forming tool profile and the workpiece to be formed by combining oscillating relative motion with unidirectional relative motion to suit their respective applications.

[0040] In the latter case, according to the invention and / or the temporal sequence of oscillating relative motion and unidirectional relative motion, the ratio of oscillating relative motion to unidirectional relative motion is variable in the overall relative motion between the shaping tool profile and the workpiece to be formed.

[0041] In another embodiment of the method of the present invention, the oscillating relative motion of the shaping tool and the workpiece to be formed includes a plurality of oscillating sub-relative motions, which are separated from each other by the unidirectional relative motion of the shaping tool profile and the workpiece to be formed. For changes related to the application of the current forming process, and if necessary, for changes related to the application of the prior forming process in terms of the oscillating relative motion, each oscillating sub-relative motion can be processed in the manner described above. Attached Figure Description

[0042] The invention will now be explained in more detail with the aid of exemplary schematic diagrams. The diagrams are as follows:

[0043] Figure 1 This illustrates a machine device for producing the side profile of a plastically deformable cylindrical workpiece by axial forming.

[0044] Figure 2 Shown in Figure 1 The first possibility for designing a forming process on the machine device shown.

[0045] Figure 3Shown in Figure 1 The second possibility for designing a forming process on the machine device shown. Detailed Implementation

[0046] Figure 1 The machine device 100 shown is designed to produce an external tooth profile on a plastically deformable cylindrical workpiece (here, a steel blank 2 for a motor vehicle drive shaft). As a forming tool, the forming machine 1 of the machine device 100 includes a conventional forming die 3, which has a [missing information - likely a measurement feature] in the area of ​​the calibration section 4. Figure 1 The profile of the forming teeth, not shown in detail, serves as the profile of the shaping tool.

[0047] With the aid of the forming drive device 5, the forming die 3 can move relative to the blank 2 along the motion axis 6, which is clamped by the clamping unit 7 and therefore cannot move along the motion axis 6.

[0048] The forming drive device 5 includes a hydraulic piston-cylinder unit 8 with a fixed cylinder 9 and a piston 10 movably guided along a motion axis 6 within the cylinder 9. The piston-cylinder unit 8 is connected to the forming die 3 at a piston rod 11. To control the forming drive device 5, a [missing information - likely a typo, should be "in..."] Figure 1 The programmable numerical control system is shown very schematically in the form of a digital drive control device 12.

[0049] In the example shown, the diameter-reduced shaft end 13 of the shaft blank 2 is provided with a workpiece side tooth profile by axial forming, which has a workpiece side profile length L.

[0050] Therefore, from Figure 1 The conditions are as shown. First, the forming die 3 is unidirectionally advanced along the motion axis 6 by means of the piston-cylinder unit 8 until the end of the alignment part 4, which is in the direction of motion, and thus the end of the forming tooth profile set on the forming die 3, which is in the direction of motion, reaches the shaft end 13 of the shaft blank 2. The forming process now begins, during which the forming die 3 is positioned relative to the shaft blank 2. Figure 1 The process moves further to the right, but now, through the corresponding control of the piston-cylinder unit 8 by the drive control device 12, the forming die 3 performs relative to the shaft blank 2. Figure 1The oscillating motion propagates to the right. During the oscillating relative motion between the forming die 3 and the forming tooth profile (on one hand) and the shaft blank 2 (on the other hand), the forming tooth profile alternately performs a forming stroke in the direction of arrow 14 and a return stroke in the direction of arrow 15, the direction of the return stroke being opposite to the direction of the forming stroke. In the forming stroke, the forming tooth profile of the forming die 3 meshes with the shaft end 13 to be formed and generates a workpiece side tooth profile at the shaft end through the forming or deformation of the shaft end 13, which has a portion of the length L of the workpiece side tooth profile. In the return stroke of the oscillating relative motion between the forming die 3 and the shaft blank 2, the forming tooth profile moves in the opposite direction of the forming stroke along a portion of the length L of the workpiece side tooth profile generated in the previous or completed forming stroke. During the oscillating relative motion between the forming tooth profile of the forming die 3 and the shaft blank 2, by means of Figure 1 The lubricant supply device 17 shown applies lubricant to the shaft blank 2.

[0051] With the aid of the digital drive control device 12, the current or ongoing forming process varies in terms of the oscillating relative motion between the forming tooth profile and the shaft blank 2, depending on the stiffness of the shaft blank 2 in the region of the shaft end 13 to be formed.

[0052] The manner in which the current forming process alters the oscillating relative motion between the forming tooth profile and the workpiece is determined by programming the drive control device 12 accordingly prior to the forming process. Here, the programmed process parameters are empirically determined using a previous forming process that has been tested.

[0053] Therefore, after a trial run of the forming process, the side profile of the workpiece generated in the trial is measured using the measuring and evaluation device 16 of the machine device 100, and then the geometry of the side profile of the workpiece generated in the trial is compared with the desired target geometry. The measurement results, which depend on the stiffness of the shaft blank in the region of the shaft end 13, are then used as the programming basis for the drive control device 12 for subsequent forming processes.

[0054] Figure 2 Showing by the Figure 1 The method of programming the drive control device 12 of the machine device 100 shown.

[0055] Figure 2 The diagram shows the path s of the formed tooth profile over time t. The downward-pointing flank 18 of the serrated pattern represents the forming stroke of the formed tooth profile, while the upward-pointing flank 19 of the serrated pattern represents the return stroke of the formed tooth profile relative to the blank 2. The tool side tooth length L is achieved at point P1.

[0056] according to Figure 2In the example shown, due to the corresponding control of the forming drive device 5, the oscillating relative motion of the forming tooth profile and the blank 2 to be formed changes at time point T1 as follows: the forming stroke amount and the return stroke amount after the forming stroke decrease, and the frequency of the oscillating relative motion of the forming tooth profile and the blank 2 to be formed increases.

[0057] Figure 3 This illustrates the changes in the oscillating relative motion between the forming tooth profile of the forming die 3 and the workpiece to be formed in the current forming process. Figure 2 The situation shown has changed somewhat. Figure 3 In the application scenario shown, the oscillating relative motion between the forming tooth profile and the workpiece to be formed only produces a portion of the workpiece side profile length L. At time point T2, due to the corresponding control of the forming drive device 5 by the drive control device 12, the oscillating relative motion between the forming tooth profile and the workpiece to be formed, which was still in progress until this point, ends. Then, the unidirectional forming motion of the forming tooth profile relative to the workpiece to be formed continues until the workpiece side tooth length L is reached at time point P2.

Claims

1. A method for producing a workpiece side profile on a plastically deformable, preferably cylindrical, workpiece (2) by axial forming, ·in, A forming process is performed, in which the relative movement between the forming tool profile set on the forming tool (3) and the workpiece (2) to be formed is implemented to generate a workpiece side profile having a workpiece side profile length (L). • Among them, in the ongoing molding process - An oscillating relative motion is implemented between the forming tool profile and the workpiece to be formed (2) in the relative motion of the forming tool profile and the workpiece to be formed (2), and the forming stroke and the return stroke opposite to the forming stroke are alternately implemented in the oscillating relative motion. - During the forming stroke of the oscillating relative motion, the forming tool profile generates a workpiece side profile on the workpiece (2) with a partial length of workpiece side profile length (L), and - During the return stroke of the oscillating relative motion, at least a portion of the forming tool profile moves along the length (L) of the workpiece side profile generated in the previous forming stroke. The feature is that the oscillating relative motion of the forming tool profile and the workpiece (2) to be formed is changed during the ongoing forming process.

2. The method according to claim 1, characterized in that, The forming process is controlled by a programmable numerical control device (12) which stores control parameters to execute the forming process. Based on the control parameters, changes in the oscillating relative motion of the forming tool profile and the workpiece (2) to be formed are made in the ongoing forming process.

3. The method according to claim 1 or 2, characterized in that, • The forming process is performed after the preceding forming process in time, wherein the preceding forming process involves relative movement between the forming tool profile (3) and the preferably cylindrical workpiece (2) to be formed, to produce a workpiece side profile having a workpiece side profile length (L), wherein the forming tool (3) of the preceding forming process and the forming tool (3) of the forming process are of the same type or the same, and wherein the workpiece (2) of the preceding forming process and the workpiece (2) of the forming process are of the same type or the same. • In the ongoing pre-molding process - An oscillating relative motion is implemented between the forming tool profile and the workpiece to be formed (2) in the relative motion of the forming tool profile and the workpiece to be formed (2), and the forming stroke and the return stroke opposite to the forming stroke are alternately implemented in the oscillating relative motion. - During the forming stroke of oscillating relative motion, the forming tool profile generates a workpiece side profile with a partial length (L) on the workpiece (2), and - During the return stroke of the oscillating relative motion, the forming tool profile moves along at least a portion of the length generated in the previous forming stroke along the workpiece side profile length (L). - After the prior forming process is completed, determine the actual geometry of the workpiece side profile generated in the prior forming process and compare it with the target geometry of the workpiece side profile, and -If the actual geometry of the workpiece side profile produced in the pre-forming process deviates from the target geometry of the workpiece side profile, a forming process is performed, wherein in the ongoing forming process, the oscillating relative motion of the forming tool profile and the workpiece to be formed (2) is changed such that the actual geometry of the workpiece side profile produced in the forming process is consistent with or at least close to the target geometry of the workpiece side profile.

4. The method according to claim 3, characterized in that, • The prior forming process is controlled by a numerical control device (12), which stores control parameters for controlling the ongoing prior forming process in terms of the oscillating relative motion between the forming tool contour and the workpiece (2) to be formed, and • The forming process is controlled by means of a programmable numerical control device (12), in which control parameters are stored to execute the forming process. Based on the control parameters, the oscillating relative motion between the forming tool profile and the workpiece (2) to be formed is varied in the ongoing forming process. Based on this variation, the actual geometry of the workpiece side profile generated in the forming process is consistent with or at least close to the target geometry of the workpiece side profile.

5. The method according to claim 3 or 4, characterized in that, The actual geometry of the workpiece side profile produced in the prior forming process and the workpiece side profile produced in the forming process are determined by measuring the workpiece side profile produced in the prior forming process and the workpiece side profile produced in the forming process.

6. The method according to any one of claims 3 to 5, characterized in that, The prior forming process in progress is unified in terms of the oscillating relative motion between the forming tool profile and the workpiece to be formed (2).

7. The method according to any one of claims 3 to 5, characterized in that, • In the ongoing prior forming process, the oscillating relative motion of the forming tool profile and the workpiece to be formed (2) changes, and - The changes made in the oscillating relative motion of the forming tool profile and the workpiece to be formed (2) in the ongoing forming process are different from the changes made in the prior forming process in the ongoing process.

8. The method according to any one of claims 3 to 7, characterized in that, - The pre-forming process is performed as a trial forming process, in which the side profile of the workpiece is generated on a test workpiece set as the workpiece to be formed (2), and • The molding process is executed as a production process, in which the workpiece side profile is generated on a workpiece (2) of the same type as the test workpiece of the molding process.

9. The method according to any one of the preceding claims, characterized in that, In the forming process, and if necessary in the prior forming process, the forming tooth profile set on the forming tool (3) as the forming tool profile and the workpiece to be formed (2) move relative to each other to generate a workpiece side profile with a workpiece side tooth profile structured as the workpiece side tooth profile and having a workpiece side tooth length as the workpiece side profile length (L). • In this process, the forming tooth profile meshes with the workpiece (2) to be formed during the forming stroke of the oscillating relative motion and generates a workpiece side tooth profile with a partial length of the workpiece side tooth length on the workpiece (2). • In the return stroke of the oscillating relative motion, the profile of the forming tooth moves along at least a portion of the length of the workpiece side tooth generated in the previous forming stroke.

10. The method according to any one of the preceding claims, characterized in that, The changes in the oscillating relative motion of the forming tool profile and the workpiece to be formed (2) during the ongoing forming process and, if necessary, during the preceding forming process, are based on the process-related characteristics of the workpiece to be formed.

11. The method according to claim 10, characterized in that, The changes in the oscillating relative motion of the forming tool profile and the workpiece (2) to be formed during the ongoing forming process and, if necessary, during the prior forming process, are based on the rigidity of the workpiece (2).

12. The method according to claim 10 or claim 11, characterized in that, The changes in the oscillating relative motion of the forming tool profile and the workpiece (2) to be formed during the ongoing forming process and, if necessary, during the prior forming process, are made according to the material of the workpiece (2).

13. The method according to any one of the preceding claims, characterized in that, The oscillating relative motion of the forming tool profile and the workpiece to be formed (2) during the ongoing forming process and, if necessary, during the prior forming process, is performed according to at least one forming technique parameter.

14. The method according to any one of the preceding claims, characterized in that, The changes in the oscillating relative motion of the forming tool profile and the workpiece to be formed (2) in the ongoing forming process and, if necessary, in the prior forming process are achieved by varying the forming stroke value and / or return stroke value and / or oscillating relative motion frequency.

15. The method according to any one of the preceding claims, characterized in that, The changes in the oscillating relative motion of the forming tool profile and the workpiece (2) to be formed in the ongoing forming process and, if necessary, the prior forming process are carried out in such a way that the oscillating relative motion is implemented as part of the relative motion of the forming tool profile and the workpiece (2), and that, in addition to the oscillating relative motion, a unidirectional relative motion of the forming tool profile and the workpiece (2) to be formed is implemented as another part of the relative motion of the forming tool profile and the workpiece (2), wherein, in the unidirectional relative motion, the forming tool profile produces a workpiece side profile on the workpiece (2) having a partial length of workpiece side profile length (L).

16. The method according to claim 15, characterized in that, • The proportion of oscillating relative motion and unidirectional relative motion to the relative motion of the forming tool contour and the workpiece to be formed (2) can be variably determined, and / or • The sequence of oscillating relative motion and unidirectional relative motion can be determined variably.

17. The method according to at least claim 15, characterized in that, The oscillating relative motion between the forming tool contour and the workpiece to be formed (2) includes multiple oscillating sub-relative motions, wherein a unidirectional relative motion is implemented between two oscillating sub-relative motions, and • Changes in the oscillating relative motion in the ongoing molding process and, if necessary, the prior molding process are carried out in such a way that the ongoing molding process and, if necessary, the prior molding process are changed in at least one aspect of the oscillating relative motion.

18. A machine apparatus for performing the method according to claim 2, comprising a forming machine (1) having a forming drive (5) configured to carry out relative movement in the forming process between a forming tool profile disposed on a forming tool (3) of the forming machine (1) and a preferably cylindrical workpiece (2) to be formed, to produce a workpiece side profile having a workpiece side profile length (L). ·in, A programmable digital drive control device (12) is provided for the molding drive device (5). This drive control device is configured to control the molding drive device (5) in such a way that control parameters can be stored in the drive control device (12). Based on the control parameters, during the ongoing molding process, an oscillating relative motion of the molding tool contour and the workpiece to be molded (2) is implemented in the relative motion of the molding tool contour and the workpiece to be molded (2). In this oscillating relative motion, the molding stroke and the return stroke opposite to the direction of the molding stroke are alternately implemented. • In the oscillating relative motion forming stroke, the forming tool profile generates a workpiece side profile with a partial length (L) on the workpiece (2), and • In the return stroke of the oscillating relative motion, at least a portion of the forming tool profile moves along the length (L) of the workpiece side profile generated in the previous forming stroke. Its features are, The drive control device (12) is configured to store control parameters for the molding process, and based on the control parameters, to perform oscillating relative motion changes between the profile of the forming tool and the workpiece (2) to be formed during the molding process.

19. The machine apparatus according to claim 18, used to perform the method according to claim 4, characterized in that, The forming drive device (5) of the forming machine (1) is configured to perform the forming process after the preceding forming process in time, and to implement relative motion between the forming tool profile set on the forming tool (3) of the forming machine (1) and the preferably cylindrical workpiece (2) to be formed in the preceding forming process, so as to produce a workpiece side profile having a workpiece side profile length (L), wherein the forming tool (3) of the preceding forming process and the forming tool (3) of the forming process are of the same kind or the same, and wherein the workpiece (2) of the preceding forming process and the workpiece (2) of the forming process are of the same kind or the same. • The drive control device (12) is configured to control the forming drive device (5) in such a way that control parameters can be stored in the drive control device (12), and based on the control parameters, an oscillating relative motion of the forming tool contour and the workpiece to be formed (2) is implemented in the prior forming process during the ongoing process, and the forming stroke and the return stroke opposite to the forming stroke are alternately implemented in the oscillating relative motion. -In the forming stroke of oscillating relative motion, the profile of the forming tool is on the workpiece (2). The workpiece side profile with a partial length of workpiece side profile length (L) is generated, and -In the return stroke of the oscillating relative motion, the forming tool profile moves along at least a portion of the length (L) of the workpiece side profile generated in the previous forming stroke. • A measuring and evaluation device (16) is set up, by means of which the actual geometry of the workpiece side profile generated in the prior forming process can be determined after the prior forming process is completed and compared with the target geometry of the workpiece side profile. If there is a deviation between the actual geometry of the workpiece side profile generated in the prior forming process and the target geometry of the workpiece side profile, the forming process is performed by means of the forming machine (1). • The drive control device (12) is configured to store control parameters for the molding process, based on which changes are made in the oscillating relative motion of the molding tool profile and the workpiece (2) to be molded during the molding process, based on which the actual geometry of the workpiece side profile generated in the molding process is consistent with or at least close to the target geometry of the workpiece side profile.

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