NC thread rolling machine

Abstract

To provide an NC thread rolling machine that performs rough processing and finishing processing on a workpiece and that can be made compact.SOLUTION: An NC thread rolling machine 100 comprises: a pair of first flat dies 104a, 104b for rough processing; a pair of second flat dies 105a, 105b for finishing processing arranged adjacently to the first flat dies in parallel; rack driving mechanisms 106a, 106b which move one pair of first and second flat dies and the other pair of first and second dies mutually in parallel directions and also in opposite directions; respective mechanisms 110, 112, and 114 which rotate a workpiece, support both ends of the work rotatably, and also shift the workpiece between the first flat dies and second flat dies; and a numerical control part 148, wherein the numerical control part controls the respective mechanisms including the rack driving mechanism to support the workpiece between the first flat dies so as to perform rough processing on the workpiece with the first flat dies, shift the workpiece after the rough processing to between the second flat dies, and then perform finishing processing on the workpiece with the second flat dies.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an NC forging machine that forges a gear shape onto a workpiece.

Background Art

[0002] As a forging machine, it is well-known that a pair of forging flat dies (also called forming racks) are pressed against the outer peripheral surface of a workpiece (workpiece) such as a shaft-shaped part such as a shaft, and are rotated while being pressed, and the tooth profile on the die surface is transferred to the workpiece.

[0003] For example, Patent Document 1 describes a forging flat die. This forging flat die has a first die component for rough machining having snagging teeth, a second die component for finish machining having finishing teeth, and a plate. Further, the first die component and the second die component are detachably fixed above the plate in a state of being arranged in a row using fastening means.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the forging flat die of Patent Document 1, when the diameter of the workpiece increases, the required number of teeth increases, so the total length of the flat die composed of the first die component and the second die component becomes long. For this reason, the forging machine to which this forging flat die is applied becomes large-sized and the cost becomes high. Also, in a vertical forging machine, when it becomes large-sized, the mounting positions of the workpiece and the flat die become high, and the workability also deteriorates.

[0006] In view of such problems, an object of the present invention is to provide an NC rotary forging machine capable of reducing the size in an NC rotary forging machine that performs rough machining and finish machining on a workpiece.

Means for Solving the Problems

[0007] In order to solve the above problems, a typical configuration of the NC rotary forging machine according to the present invention is an NC rotary forging machine that forges a gear shape on a workpiece, and includes a pair of first flat dies for rough machining facing each other, and a pair of first flat dies. A pair of second flat dies for finish machining, which are arranged adjacent to each other in parallel and face each other, two rack drive mechanisms for moving one of the first and second flat dies and the other first and second flat dies in parallel and opposite directions, and a pair of first flat dies Between the pair of second flat dies, a workpiece rotation mechanism for rotating the workpiece, a headstock drive mechanism and a tailstock drive mechanism for rotatably supporting both ends of the workpiece and shifting the workpiece, a rack drive mechanism, a workpiece rotation mechanism, a headstock drive mechanism And a numerical control unit for controlling the operations of the tailstock drive mechanism, and the numerical control unit controls the headstock drive mechanism and the tailstock drive mechanism to support the workpiece between the pair of first flat dies, and controls the workpiece rotation mechanism and the rack drive mechanism. Rough machining is performed on the workpiece by a pair of first flat dies, the headstock drive mechanism and the tailstock drive mechanism are controlled to shift the rough machined workpiece between the pair of second flat dies, and the workpiece rotation mechanism and the rack drive mechanism are controlled to perform the pair of second flat dies. It is characterized in that finish machining is performed on the workpiece by.

[0008] It is preferable that the pair of first flat dies and the pair of second flat dies have relief teeth formed at positions where the workpiece is shifted.

[0009] It is preferable to provide two OPD adjustment mechanisms for moving the pair of first flat dies and the pair of second flat dies relative to each other in a separating / contacting direction orthogonal to the parallel direction, and when rough machining of the workpiece by the pair of first flat dies is completed, the numerical control unit controls the operation of the OPD adjustment mechanism to widen the gap between the pair of first flat dies and the pair of second flat dies, controls the headstock drive mechanism and the tailstock drive mechanism to shift the workpiece between the pair of second flat dies, and then controls the operation of the OPD adjustment mechanism to narrow the gap between the pair of first flat dies and the pair of second flat dies, thereby clamping the workpiece with the pair of second flat dies.

Advantages of the Invention

[0010] According to the present invention, it is possible to provide an NC roll turning machine capable of reducing the size of an NC roll turning machine for performing rough machining and finish machining on a workpiece.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0012] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. Dimensions, materials, and other specific numerical values shown in such embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In this specification and the drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to omit redundant description, and elements not directly related to the present invention are not shown.

[0013] FIG. 1 is a perspective view showing an overview of the configuration of an NC rotary forging machine 100 according to an embodiment of the present invention. FIG. 2 is a view showing a main part of the NC rotary forging machine 100 of FIG. 1. The NC rotary forging machine 100 is a machine tool for rotary forging a workpiece (workpiece 102) shown in FIG. 2. The workpiece 102 is, for example, a shaft-like part such as a shaft.

[0014] The NC rotary forging machine 100 includes a pair of first flat dies 104a and 104b shown in FIG. 2, and a pair of second flat dies 105a and 105b. The first flat dies 104a and 104b are rough machining flat dies facing each other. The second flat dies 105a and 105b are arranged adjacent to the first flat dies 104a and 104b in parallel (see FIGS. 6 and 7), and are finish machining flat dies facing each other.

[0015] The NC rotary forging machine 100 is an example of a vertical rotary forging machine as shown in FIG. 1. The NC rotary forging machine 100 includes two rack drive mechanisms 106a and 106b, two OPD (Over pin Diameter) adjustment mechanisms 108a and 108b, a workpiece rotation mechanism 110, a headstock drive mechanism 112, and a tailstock drive mechanism 114, and each of these drive mechanisms is controlled numerically. Therefore, the NC rotary forging machine 100 shown in FIG. 1 is a 7-axis rotary forging machine. Note that one of the headstock drive mechanism 112 or the tailstock drive mechanism 114 may be a hydraulic or pneumatic cylinder instead of NC control, and in that case, it is a 6-axis NC control.

[0016] As shown in FIG. 2, the rack drive mechanisms 106a and 106b face each other. Also, a workpiece 102 is positioned between the rack drive mechanisms 106a and 106b. Further, between the rack drive mechanisms 106a and 106b and the workpiece 102, OPD adjustment mechanisms 108a and 108b facing each other with the workpiece 102 in between are arranged.

[0017] As shown in FIG. 2, inside a pair of columnar main bodies 116a and 116b of the rack drive mechanisms 106a and 106b, a pair of ball screws 118a and 118b are arranged. A pair of moving blocks 122a and 122b are movably attached to the ball screws 118a and 118b.

[0018] Servo motors 120a and 120b are driven by power supply and rotate the ball screws 118a and 118b as independent shafts respectively. Thereby, the rack drive mechanisms 106a and 106b can move the moving blocks 122a and 122b in parallel and opposite directions to each other by rotating the ball screws 118a and 118b by driving the servo motors 120a and 120b. The X-axis which is the moving axis of the servo motor 120a has the downward direction as positive, and the Y-axis which is the moving axis of the servo motor 120b has the upward direction as positive.

[0019] The OPD adjustment mechanisms 108a and 108b have a pair of tables 124a and 124b shown in FIG. 2. The tables 124a and 124b are fixed to the moving blocks 122a and 122b of the rack drive mechanisms 106a and 106b. Further, the OPD adjustment mechanisms 108a and 108b have a pair of ball screws 126a and 126b, a pair of servo motors 128a and 128b (U-axis, V-axis), and a pair of wedge mechanisms 130a and 130b.

[0020] The wedge mechanisms 130a and 130b each include wedges 132a and 132b and pieces 134a and 134b, and these members are combined with each other so as to cause a wedge action (orthogonal conversion of the moving direction). For example, as shown in FIG. 1, the first flat die 104a and the second flat die 105a are fixed to the piece 134a and are further arranged adjacent to each other in parallel. Also, the first flat die 104b and the second flat die 105b are fixed to the piece 134b and are further arranged adjacent to each other in parallel.

[0021] In this way, the first flat die 104a and the second flat die 105a are fixed to the table 124a via the wedge mechanism 130a. The first flat die 104b and the second flat die 105b are fixed to the table 124b via the wedge mechanism 130b.

[0022] Ball screws 126a and 126b are connected to the wedges 132a and 132b. Therefore, when the servo motors 128a and 128b rotate the ball screws 126a and 126b as independent shafts, respectively, the wedges 132a and 132b can move in the vertical direction as shown by the arrows A and B. As a result, the pieces 134a and 134b can move in the horizontal direction as shown by the arrows C and D.

[0023] Thereby, the OPD adjustment mechanisms 108a and 108b can move the first flat die 104a and the second flat die 105a fixed to the piece 134a and the first flat die 104b and the second flat die 105b fixed to the piece 134b away from and towards each other. The away-from-and-towards direction is the direction in which the first flat dies 104a and 104b and the second flat dies 105a and 105b move away from and towards each other while maintaining the facing state, and is the direction orthogonal to the above-mentioned parallel direction by the rack drive mechanisms 106a and 106b. For this reason, the OPD adjustment mechanisms 108a and 108b can change the distance between the first flat dies 104a and 104b and the distance between the second flat dies 105a and 105b.

[0024] Further, the first flat dies 104a and 104b have a plurality of teeth 136a and 136b on the surface facing the workpiece 102. Further, the second flat dies 105a and 105b have a plurality of teeth 137a and 137b on the surface facing the workpiece 102.

[0025] The rack drive mechanisms 106a and 106b move the first flat dies 104a and 104b and the second flat dies 105a and 105b in parallel and opposite directions to each other, and further reciprocate them. As a result, the rack drive mechanisms 106a and 106b can perform rough machining on the workpiece 102 by rolling while pressing the teeth 136a and 136b of the first flat dies 104a and 104b against the outer peripheral surface of the workpiece 102. Although details will be described later, FIG. 2 shows a state in which the workpiece 102 is supported between the first flat dies 104a and 104b and before the teeth 136a and 136b of the first flat dies 104a and 104b are pressed against the outer peripheral surface of the workpiece 102.

[0026] Furthermore, the rack drive mechanisms 106a and 106b can perform finish machining on the workpiece 102 by rolling while pressing the teeth 137a and 137b of the second flat dies 105a and 105b against the outer peripheral surface of the workpiece 102 after rough machining (to be described later).

[0027] The workpiece rotation mechanism 110 shown in FIG. 1 has a servo motor (not shown), and the servo motor rotates the workpiece 102 along the C axis in the rotational direction around the Z axis in the figure in synchronization with the vertical movement of the first flat dies 104a and 104b and the second flat dies 105a and 105b by the rack drive mechanisms 106a and 106b.

[0028] The headstock drive mechanism 112 has a headstock (not shown) supported so as to be movable along the Z axis direction and a servo motor 138. The headstock drive mechanism 112 moves the headstock along the Z axis direction, that is, along the axial direction of the workpiece 102 by driving the servo motor 138, and further supports the workpiece 102 rotatably.

[0029] The tailstock drive mechanism 114 includes a tailstock 140 that is movably supported along the W-axis direction in the figure, and a servo motor 141. The tailstock 140 is disposed opposite to the headstock, moves along the axial direction of the workpiece 102 by the servo motor 141, and further abuts against the workpiece 102. Thereby, the headstock drive mechanism 112 and the tailstock drive mechanism 114 rotatably support both ends of the workpiece 102 and axially shift the workpiece 102.

[0030] Figure 3 is a functional block diagram of the NC swaging machine 100 of FIG. 1. The NC swaging machine 100 includes a control device 142 and an input device 144. The control device 142 controls the operation of the NC swaging machine 100.

[0031] The input device 144 inputs values obtained by measuring the shape of the workpiece 102 and various values set from the machining specifications of the workpiece 102. As an example, the input device 144 sets the target OPD value (OPD target value W) of the workpiece 102 and the position (OPD measurement position A) for measuring the OPD of the workpiece 102 from the machining specifications, and inputs the OPD measurement value P measured at the OPD measurement position A. Then, the input device 144 inputs the OPD measurement value P, the OPD target value W, and the OPD measurement position A to the control device 142.

[0032] The control device 142 includes a numerical control unit 148, a servo control unit 150, a storage unit 152, a machining program 154, a workpiece measurement unit 156, a PMC (Programmable Machine Controller) ladder 158, and a machine control unit 160.

[0033] The numerical control unit 148 is capable of multi-axis synchronous control. While constantly monitoring the load torque of each axis servo motor 146, it controls the operations of the rack drive mechanisms 106a, 106b, the OPD adjustment mechanisms 108a, 108b, and the workpiece rotation mechanism 110, calculates the control amount of each axis servo motor 146 so that the workpiece 102 is forged by the first flat dies 104a, 104b and the second flat dies 105a, 105b, and outputs this control amount to the servo control unit 150. The servo control unit 150 outputs the control amount output from the numerical control unit 148 to each axis servo motor 146 as a drive signal.

[0034] The storage unit 152 stores the specifications of the workpiece 102 such as its shape (number of teeth: even or odd) and forging processing conditions (forging speed, etc.). Further, the measured OPD value P, the OPD target value W, and the OPD measurement position A from the input device 144 are written into the storage unit 152 by the workpiece measurement unit 156. The machining program 154 is a program for the machining process during the forging operation, and for example, an NC program can be exemplified.

[0035] The PMC ladder 158 is a PC (Programmable Controller) built into the control device 142 as a CNC (Computer Numerical Control), and executes the sequence control of the machine tool. Also, the PMC ladder 158 exchanges signals with various machines 162 such as external devices that the numerical control unit 148 cannot directly communicate with, or exchanges signals with pre-determined content with the numerical control unit 148 using internal I / O, according to a sequence program created in ladder language. The machine control unit 160 controls various machines 162 based on the signals output from the PMC ladder 158.

[0036] FIG. 4 is a view showing the first flat die 104a and the second flat die 105a of FIG. 2. On the tooth 136a of the first flat die 104a for rough machining, a gradient is provided such that the tooth height gradually increases from the lower end portion 164a towards the front of the upper end portion 166a as shown in the figure, and a relief tooth 168a with a low tooth height is formed near the upper end portion 166a.

[0037] The teeth 137a of the second flat die 105a for finishing have almost no gradient. For this reason, the teeth 137a of the second flat die 105a are formed with almost uniform tooth height from the lower end portion 165a to near the upper end portion 167a as shown in the figure, and a relief tooth 169a with a low tooth height is formed near the upper end portion 167a.

[0038] Also, as shown in FIGS. 6 and 7, the teeth 136b of the opposite first flat die 104b are provided with a gradient such that the tooth height gradually increases from the upper end portion 166b toward near the lower end portion 164b, and a relief tooth 168b with a low tooth height is formed near the lower end portion 164b. Further, the teeth 137b of the opposite second flat die 105b have almost no gradient. For this reason, the teeth 137b of the second flat die 105b are formed with almost uniform tooth height from the upper end portion 167b to near the lower end portion 165b, and a relief tooth 169b with a low tooth height is formed near the lower end portion 165b.

[0039] FIG. 5 is a flowchart showing the operation of the NC forging machine 100 of FIG. 1. FIG. 6 is a view showing a rough machining state of the workpiece 102. FIG. 7 is a view showing a state where the workpiece 102 after rough machining is shifted and finish machining is performed on the workpiece 102.

[0040] Here, as shown in FIGS. 6 and 7, the NC forging machine 100 divides the flat dies into those for rough machining (the first flat dies 104a, 104b) and those for finishing (the second flat dies 105a, 105b). For this reason, in the NC forging machine 100, since the total length of the flat die (in the configuration of FIG. 1, the longitudinal direction) can be shortened (to about half), miniaturization can be achieved.

[0041] The operation when rough machining and finish machining are performed on the workpiece 102 using such an NC roll forging machine 100 will be described. First, in the NC roll forging machine 100, the numerical control unit 148 controls the headstock drive mechanism 112 and the tailstock drive mechanism 114 (see FIG. 1) to support the workpiece 102 between the first flat dies 104a and 104b as shown in FIGS. 2 and 6(a) (step S100). Note that FIG. 6(a) shows the workpiece 102 which is a round bar before roll forging.

[0042] Also in step S100, the numerical control unit 148 controls the OPD adjustment mechanisms 108a and 108b to reduce the distances between the first flat dies 104a and 104b and between the second flat dies 105a and 105b so that the teeth 136a and 136b of the first flat dies 104a and 104b are pressed against the outer peripheral surface of the workpiece 102.

[0043] Next, the numerical control unit 148 controls the workpiece rotation mechanism 110 and the rack drive mechanisms 106a and 106b to perform rough machining by forward roll forging on the workpiece 102 using the first flat dies 104a and 104b as shown in FIG. 6(b) (step S102). That is, the rack drive mechanisms 106a and 106b move the first flat die 104a and the second flat die 105a downward and the first flat die 104b and the second flat die 105b upward as shown by the arrows in FIG. 6(b). In this way, the rack drive mechanisms 106a and 106b can perform rough machining on the workpiece 102 by rolling while pressing the teeth 136a and 136b of the first flat dies 104a and 104b against the outer peripheral surface of the workpiece 102 and transferring the tooth profile on the die surface to the workpiece 102. Note that FIG. 6(b) shows the workpiece 102 after rough machining.

[0044] Subsequently, the numerical control unit 148 controls the headstock drive mechanism 112 and the tailstock drive mechanism 114 to shift the workpiece 102 after rough machining located between the first flat dies 104a and 104b shown in FIG. 6(b) between the second flat dies 105a and 105b as shown by the arrow in FIG. 7(a) (step S104).

[0045] Here, the rough-machined workpiece 102 shown in FIG. 6(b) is positioned between a relief tooth 168a (see FIG. 4) formed near the upper end portion 166a of the first flat die 104a and a relief tooth 168b formed near the lower end portion 164b of the first flat die 104b. The relief tooth 168a of the first flat die 104a and the relief tooth 168b of the first flat die 104b have a reduced tooth height as described above. Therefore, a gap is generated between the rough-machined workpiece 102 shown in FIG. 6(b) and the first flat dies 104a and 104b.

[0046] Furthermore, as shown in FIG. 7(a), the rough-machined workpiece 102 shifted between the second flat dies 105a and 105b in step S104 is positioned between a relief tooth 169a formed near the upper end portion 167a of the second flat die 105a and a relief tooth 169b formed near the lower end portion 165b of the second flat die 105b. The relief tooth 169a of the second flat die 105a and the relief tooth 169b of the second flat die 105b have a reduced tooth height as described above. Therefore, a gap is generated between the shifted rough-machined workpiece 102 shown in FIG. 7(a) and the second flat dies 105a and 105b.

[0047] Thus, the relief teeth 168a and 168b of the first flat dies 104a and 104b and the relief teeth 169a and 169b of the second flat dies 105a and 105b are formed at the positions where the workpiece 102 is shifted. Thereby, when the workpiece 102 is shifted in step S104, the workpiece 102 does not collide with and get cut by the first flat dies 104a and 104b and the second flat dies 105a and 105b. Therefore, lateral cutting during the shift of the workpiece 102 can be prevented.

[0048] Here, the first flat dies 104a and 104b for rough machining and the second flat dies 105a and 105b for finish machining are attached so that their phases match. Also, in step S104, while creating a gap between the workpiece 102 after rough machining and the first flat dies 104a and 104b, the workpiece 102 is shifted while leaving the engagement between the relief teeth 168a and 168b of the first flat dies 104a and 104b and the teeth of the workpiece 102 (for example, in a state where they are slightly separated so that the relief teeth 168a and 168b and the teeth of the workpiece 102 do not disengage). As a result, when the workpiece 102 after rough machining is shifted between the second flat dies 105a and 105b, no phase shift occurs, so phase alignment is not required.

[0049] Next, the numerical control unit 148 controls the workpiece rotation mechanism 110 and the rack drive mechanisms 106a and 106b to perform finish machining on the workpiece 102 by reverse rolling using the second flat dies 105a and 105b as shown in FIG. 7(b) (step S106). That is, the rack drive mechanisms 106a and 106b each move the first flat die 104a and the second flat die 105a upward and the first flat die 104b and the second flat die 105b downward as shown by the arrows in FIG. 7(b). In this way, the rack drive mechanisms 106a and 106b can perform finish machining on the workpiece 102 by rolling the teeth 137a and 137b of the second flat dies 105a and 105b while pressing them against the outer peripheral surface of the workpiece 102 and transferring the tooth profile on the die surface to the workpiece 102. Note that FIG. 7(b) shows the workpiece 102 after finish machining.

[0050] In this way, according to the NC roll forging machine 100, miniaturization can be achieved, and furthermore, rough machining and finish machining can be performed on the workpiece 102.

[0051] In the NC roll forging machine 100, the relief teeth 168a and 168b of the first flat dies 104a and 104b and the relief teeth 169a and 169b of the second flat dies 105a and 105b are formed at positions where the workpiece 102 is shifted to prevent side cutting during the shift of the workpiece 102, but it is not limited to this.

[0052] As an example, when rough machining of the workpiece 102 by the first flat dies 104a and 104b is completed, in step S104, first, the numerical control unit 148 controls the operations of the OPD adjustment mechanisms 108a and 108b to widen the intervals between the first flat dies 104a and 104b and the second flat dies 105a and 105b. Next, the numerical control unit 148 controls the headstock drive mechanism 112 and the tailstock drive mechanism 114 to shift the workpiece 102 between the second flat dies 105a and 105b.

[0053] Subsequently, the numerical control unit 148 controls the operations of the OPD adjustment mechanisms 108a and 108b again to narrow the intervals between the first flat dies 104a and 104b and the second flat dies 105a and 105b, thereby clamping the workpiece 102 with the second flat dies 105a and 105b. As a result, in step S106, finish machining of the workpiece 102 by the second flat dies 105a and 105b can be performed by rotary forging.

[0054] In this way, when the workpiece 102 is shifted, it is possible to prevent side cutting in which the workpiece 102 hits and is cut by the first flat dies 104a and 104b and the second flat dies 105a and 105b. As a result, it is not necessary to provide the relief teeth 168a and 168b of the first flat dies 104a and 104b and the relief teeth 169a and 169b of the second flat dies 105a and 105b, so the overall lengths of the first flat dies 104a and 104b and the second flat dies 105a and 105b can be further shortened.

[0055] As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings. Needless to say, the present invention is not limited to such examples. It is obvious that those skilled in the art can conceive of various modification examples or correction examples within the scope described in the claims, and it is naturally understood that they also belong to the technical scope of the present invention.

Industrial Applicability

[0056] The present invention can be used as an NC rolling machine for rolling a gear shape onto a workpiece.

Explanation of Signs

[0057] 100…NC rolling machine, 102…workpiece, 104a, 104b…first flat die, 105a, 105b…second flat die, 106a, 106b…rack drive mechanism, 108a, 108b…OPD adjustment mechanism, 110…workpiece rotation mechanism, 112…headstock drive mechanism, 114…tailstock drive mechanism, 116a, 116b…main body, 118a, 118b, 126a, 126b…ball screw, 120a, 120b, 128a, 128b, 138, 141…servo motor, 122a, 122b…moving block, 124a, 124b…table, 130a, 130b…wedge mechanism, 132a, 132b…wedge, 134a, 134b…block, 136a, 136b…teeth of the first flat die, 137a, 137b…teeth of the second flat die, 140…tailstock, 142…control device, 144…input device, 146…each axis servo motor, 148…numerical control unit, 150…servo control unit, 152…memory unit, 154…processing program, 156…workpiece measurement unit, 158…PMC ladder, 160…machine control unit, 162…various machines, 164a, 164b…lower end parts of the teeth of the first flat die, 165a, 165b…lower end parts of the teeth of the second flat die, 166a, 166b…upper end parts of the teeth of the first flat die, 167a, 167b…upper end parts of the teeth of the second flat die, 168a, 168b…relief teeth of the first flat die, 169a, 169b…relief teeth of the second flat die

Claims

1. In an NC rotary swaging machine for rotary swaging a gear shape onto a workpiece, a pair of first flat dies for rough machining, facing each other; a pair of second flat dies for finish machining, arranged adjacent to and in parallel with the pair of first flat dies and facing each other; two rack drive mechanisms for moving one of the first and second flat dies and the other of the first and second flat dies in parallel and opposite directions to each other; a workpiece rotation mechanism for rotating the workpiece between the pair of first flat dies and the pair of second flat dies; a headstock drive mechanism and a tailstock drive mechanism for rotatably supporting both ends of the workpiece and shifting the workpiece; a numerical control unit for controlling the operations of the rack drive mechanism, the workpiece rotation mechanism, the headstock drive mechanism, and the tailstock drive mechanism, wherein the numerical control unit controls the headstock drive mechanism and the tailstock drive mechanism to support the workpiece between the pair of first flat dies; controls the workpiece rotation mechanism and the rack drive mechanism to perform rough machining on the workpiece by the pair of first flat dies; controls the headstock drive mechanism and the tailstock drive mechanism to shift the rough machined workpiece between the pair of second flat dies; controls the workpiece rotation mechanism and the rack drive mechanism to perform finish machining on the workpiece by the pair of second flat dies. An NC rotary swaging machine characterized by the above.

2. The NC rotary swaging machine according to claim 1, wherein the pair of first flat dies and the pair of second flat dies have relief teeth formed at positions for shifting the workpiece.

3. The NC rotary swaging machine according to claim 1, further comprising two OPD adjustment mechanisms for moving the pair of first flat dies and the pair of second flat dies relative to each other in a separating and contacting direction perpendicular to the parallel direction, wherein the numerical control unit controls the operation of the OPD adjustment mechanism to widen the gap between the pair of first flat dies and the pair of second flat dies when the rough machining of the workpiece by the pair of first flat dies is completed; controls the headstock drive mechanism and the tailstock drive mechanism to shift the workpiece between the pair of second flat dies; controls the operation of the OPD adjustment mechanism to narrow the gap between the pair of first flat dies and the pair of second flat dies, thereby clamping the workpiece with the pair of second flat dies.

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