NC gear rolling machine

Abstract

The invention provides an NC gear rolling machine which can correct phase deviation caused by extension of a ball screw by using a simple structure and perform rolling processing with high processing precision. An NC gear rolling machine for forming a gear shape on a workpiece by rolling, the NC gear rolling machine being provided with: a ball screw; a moving block that is moved by the ball screw; a moving block that is moved by the ball screw; the gear rolling plate is mounted on the moving block; the gear rolling plate is mounted on the moving block; a pair of servomotors that move the pair of gear plates parallel to each other and in opposite directions; a control device that synchronously controls the pair of servomotors; and sensors that detect the position of the moving block before movement, in which the control device corrects the phase of the synchronization control in accordance with the position of the moving block detected by the sensors.

Description

Technical Field

[0001] The present invention relates to an NC gear rolling machine for forming a gear shape on a workpiece by rolling. Background Art

[0002] As a gear rolling machine, the following structure is known: a pair of rolling gear rolling plates (also called forming racks) are pressed against the outer peripheral surface of a workpiece (workpiece) such as an axial component such as a shaft while the pair of rolling gear rolling plates are rolled to transfer the complementary shapes of the plate tooth surfaces to the workpiece to plastically deform the workpiece.

[0003] As an example, in a gear rolling machine, a pair of gear rolling plates are arranged at positions that are point-symmetrical with respect to the axis of the workpiece, the workpiece is rotatably supported and clamped between the gear rolling plates, and the gear rolling plates are moved relatively synchronously to plastically form an involute spline or a gear on the outer periphery of the workpiece.

[0004] A pair of rolling plates are driven by a hydraulic cylinder, a ball screw, a rack and a pinion. Therefore, when the relative phase of the pair of rolling plates shifts at the beginning of rolling or during rolling, pitch error occurs, resulting in a decrease in processing accuracy. Therefore, the gear rolling machine is equipped with a synchronization device that makes the pair of rolling plates move synchronously relative to each other to prevent the phase shift of the pair of rolling plates.

[0005] When a pair of toothed plates are driven by a hydraulic cylinder, a rack and a pinion, a synchronization device needs to be provided with a timing gear at the rolling center and mechanically connect the pair of toothed plates to the timing gear.

[0006] In addition, when a pair of gear rolling plates are driven by a ball screw, there are two methods as synchronization devices: mechanically connecting a pair of gear rolling plates to the ball screw and synchronizing a pair of gear rolling plates by numerical control (NC). However, in these methods, the ball screw sometimes stretches due to heat generated during operation, causing phase shift. Therefore, in the gear rolling machine, it is necessary to take measures to counteract thermal displacement, such as arranging the cooling device and the ball screw facing each other.

[0007] In particular, in a vertical gear rolling machine, the left and right rack shafts are equipped with drive motors at the upper part of the machine, and a pair of left and right ball screws are fixed to the upper part of the machine. However, one of the origins in the control of the left and right rack shafts is on the rising end side, and the other origin is on the falling end side. Therefore, the lengths of the left and right rack shafts from the fixed part to the origin are different, and the elongation caused by thermal expansion is also different, resulting in a relative offset of the origin position. Therefore, in the past, there have been countermeasures such as adding a cooling device to cool the ball screw, or arranging the drive motors opposite to each other (the rack shaft with the origin at the bottom is equipped with a drive motor at the bottom of the machine), but their structures become complicated.

[0008] In addition, as another countermeasure, the gear rolling machine of patent document 1 is a vertical gear rolling machine, which includes a pair of ball screws, a pair of sliding tables moved by the pair of ball screws, a pair of gear rolling plates mounted on the pair of sliding tables, a sensor, and a control unit. The sensor is provided on the pair of sliding tables to detect the positions of the pair of gear rolling plates respectively.

[0009] The control unit calculates the amount of deviation of the tooth rolling plates from the point-symmetrical positional relationship with respect to the axis of the rolled object based on the current position of each slide table detected by the sensor installed on each slide table, and determines the correction amount. The deviation is caused by the extension of the ball screw due to the heat generated by the ball screw. Moreover, based on the determined correction amount, the control unit changes the relative meshing phase of the gears of the gear box, for example, changes the phase angle of the helical gear (helical gear) so that the pair of tooth rolling plates are in a point-symmetrical position with respect to the axis of the rolled object.

[0010] Prior art literature

[0011] Patent Literature

[0012] Patent Document 1: Japanese Patent Application Publication No. 2010-52020 Summary of the invention

[0013] Problem that the invention aims to solve

[0014] However, in the gear rolling machine of Patent Document 1, a complicated mechanism for changing the phase angle of the helical gear of the gear box is required, and the gear box itself is expensive, which leads to an increase in cost.

[0015] In view of such a problem, an object of the present invention is to provide an NC gear rolling machine capable of correcting a phase shift caused by the extension of a ball screw with a simple structure and performing rolling with high processing accuracy.

[0016] Solutions for solving problems

[0017] In order to solve the above-mentioned problems, the representative structure of the NC gear rolling machine involved in the present invention is an NC gear rolling machine that forms a gear shape on a workpiece by rolling, and the NC gear rolling machine is characterized in that it comprises: a first ball screw and a second ball screw; a first moving block, which is moved by the first ball screw; a second moving block, which is moved by the second ball screw; a first gear rolling plate, which is mounted on the first moving block; a second gear rolling plate, which is mounted on the second moving block; a pair of servo motors, which make the first gear rolling plate and the second gear rolling plate move parallel to each other and in opposite directions; a control device, which synchronously controls the pair of servo motors; and two sensors, which detect the positions of the first moving block and the second moving block before movement, wherein the control device corrects the phase of the synchronous control according to the positions of the first moving block and the second moving block detected by the sensors.

[0018] In the above structure, when the first and second tooth rolling plates are moved by a pair of servo motors, before the rolling process starts, the positions of the first moving block and the second moving block, to which the first and second tooth rolling plates are respectively mounted, are detected by two sensors before the movement. Then, the control device corrects the phase of the synchronous control of the pair of servo motors, that is, corrects the phase deviation caused by the thermal expansion of the ball screw, based on the positions of the first and second moving blocks detected by the sensors.

[0019] As an example, by using one sensor to detect the position of the first movable block before movement and by using another sensor to detect the position of the second movable block before movement, the control device can correct the phase shift caused by the elongation of the ball screw at the beginning of rolling, thereby starting rolling without a phase shift.

[0020] Therefore, according to the above configuration, the phase shift due to the extension of the ball screw can be corrected using a simple configuration in which two sensors are arranged and the phase is corrected by the control device, so that rolling can be performed with high processing accuracy.

[0021] Furthermore, in the case of reciprocating rolling, the phase of the synchronous control of a pair of servo motors is corrected according to the positions of the first moving block and the second moving block detected by the above-mentioned one sensor and the other sensor at the start of the forward rolling, and then the forward rolling is performed. Moreover, at the start of the backward rolling, the control device only needs to regard the position of the first moving block after the forward rolling and the position of the second moving block as opposite to correct the phase shift caused by the elongation of the ball screw. If so, the forward rolling and the backward rolling can be performed after the phase of the synchronous control of the pair of servo motors is corrected according to the positions of the first moving block and the second moving block detected by the two sensors.

[0022] Preferably, the NC gear rolling machine is capable of reciprocating rolling, wherein the control device causes the first gear rolling plate and the second gear rolling plate to reciprocate to perform rolling, and the NC gear rolling machine is equipped with four sensors, which respectively detect the positions of the first moving block and the second moving block before the reciprocating movement.

[0023] As an example, the position of the first moving block before the forward rolling is detected by a specified first sensor, and the position of the second moving block before the forward rolling is detected by a specified second sensor. The control device can thereby correct the phase shift caused by the elongation of the ball screw at the start of the forward rolling, thereby starting the forward rolling without a phase shift.

[0024] In addition, the position of the first moving block before the reverse rolling is detected by a specified third sensor, and the position of the second moving block before the reverse rolling is detected by a specified fourth sensor. Thus, the control device can correct the phase shift caused by the elongation of the ball screw at the beginning of the reverse rolling, thereby starting the reverse rolling without a phase shift.

[0025] By performing forward rolling and backward rolling after correcting the phase of synchronous control of a pair of servo motors based on the positions of the first moving block and the second moving block detected by the predetermined first to fourth sensors, rolling processing can be performed with high accuracy.

[0026] Effects of the Invention

[0027] According to the present invention, it is possible to provide an NC gear rolling machine that can correct a phase shift caused by the extension of a ball screw with a simple structure and perform rolling with high processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a perspective view schematically showing the structure of the NC gear rolling machine in the embodiment of the present invention.

[0029] Figure 2 It is shown Figure 1 Diagram of the main parts of the NC gear rolling machine.

[0030] Figure 3 yes Figure 1 Functional block diagram of the NC gear rolling machine.

[0031] Figure 4 It is shown Figure 1 Flowchart of the operation of the NC gear rolling machine. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values ​​shown in the embodiments are merely examples for easy understanding of the invention, and do not limit the present invention unless otherwise specified. In addition, in this specification and the accompanying drawings, the same reference numerals are used for elements having substantially the same functions and structures, thereby omitting repeated descriptions, and the elements that are not directly related to the present invention are omitted from illustration.

[0033] Figure 1 It is a perspective view schematically showing the structure of the NC gear rolling machine 100 in the embodiment of the present invention. Figure 2 It is shown Figure 1 The NC gear rolling machine 100 is a diagram of the main parts of the NC gear rolling machine 100. Figure 2 The machine tool shown is for performing rolling processing on a workpiece (workpiece 102).

[0034] NC gear rolling machine 100 has Figure 2 The pair of first rolling teeth plates (rolling teeth plates 104a) and second rolling teeth plates (rolling teeth plates 104b) shown in the figure press the rolling teeth plates 104a and 104b against the outer peripheral surface of the workpiece 102 while rolling the workpiece 102, transferring the complementary shape of the surface of the teeth to the workpiece 102 and plastically deforming the workpiece 102. In this way, the NC gear rolling machine 100 transfers the gear shape to the outer periphery of the workpiece 102.

[0035] like Figure 1 As shown, the NC gear rolling machine 100 is an example of a vertical gear rolling machine. The NC gear rolling machine 100 has two rack drive mechanisms 106a and 106b, a workpiece rotating mechanism 108, a headstock drive mechanism 110, and a tailstock drive mechanism 112, and each of these drive mechanisms is controlled by numerical control. Therefore, Figure 1 The NC gear rolling machine 100 shown is a 5-axis gear rolling machine. In addition, one of the headstock drive mechanism 110 and the tailstock drive mechanism 112 may be a hydraulic or pneumatic cylinder instead of an NC control, in which case a 4-axis NC control is achieved.

[0036] The rack drive mechanisms 106a, 106b have the following features: Figure 1 As shown in FIG. 1 , a pair of columnar bodies 114a and 114b are disposed facing each other. Figure 2 ) is located between the rack drive mechanisms 106a and 106b. Figure 2 In the figure, the main bodies 114a and 114b are omitted, and the main parts of the rack drive mechanisms 106a and 106b are schematically shown.

[0037] Reference Figure 2The rack drive mechanism 106a, 106b has a pair of first ball screws (ball screw 116a) and a second ball screw (ball screw 116b) arranged inside the main body 114a, 114b, and a pair of first moving blocks (moving blocks 118a) and a second moving block (moving blocks 118b). The moving blocks 118a, 118b include a pair of ball screw nuts 120a, 120b. The moving blocks 118a, 118b are movably mounted on the ball screws 116a, 116b by means of the ball screw nuts 120a, 120b.

[0038] Moreover, the toothed plates 104a and 104b are attached to the moving blocks 118a and 118b. The toothed plates 104a and 104b have a plurality of teeth 122a and 122b on the surfaces facing the workpiece 102.

[0039] The NC gear rolling machine 100 includes a pair of servo motors 124a and 124b. The ball screws 116a and 116b are fixed to the servo motors 124a and 124b via a pair of support bearings 126a and 126b. The servo motors 124a and 124b are driven by power supply, and the ball screws 116a and 116b are rotated as independent axes.

[0040] Thus, the rack drive mechanisms 106a and 106b rotate the ball screws 116a and 116b through the drive of the servo motors 124a and 124b, thereby enabling the toothed plates 104a and 104b mounted on the moving blocks 118a and 118b to move in parallel and in opposite directions. The direction below the X axis, which is the moving axis of the servo motor 124a, is positive, and the direction above the Y axis, which is the moving axis of the servo motor 124b, is positive.

[0041] The rack drive mechanisms 106a, 106b move the toothed plates 104a, 104b parallel to each other and in opposite directions, and make them reciprocate multiple times, thereby pressing the teeth 122a, 122b of the toothed plates 104a, 104b against the outer peripheral surface of the workpiece 102 while rolling the teeth 122a, 122b, thereby enabling rolling processing to be performed step by step (multiple times).

[0042] In the case of forward rolling, the moving block 118a is moved from Figure 2 The position shown in FIG. 1 (the starting position of the forward rolling) is lowered along the X-axis and moved to the position shown by the two-dot chain line C in the figure. Figure 2 The position shown (starting position of forward rolling) rises along the Y axis and moves to the position shown by the two-dot chain line D in the figure.

[0043] In the case of reverse rolling, the moving block 118a is moved from Figure 2The position indicated by the two-dot chain line C (the starting position of the backward rolling) rises along the X-axis and moves again to the starting position of the forward rolling. Figure 2 The position indicated by the two-dot chain line D (the starting position of the backward rolling) drops along the Y axis and moves again to the starting position of the forward rolling.

[0044] In the NC gear rolling machine 100 , when reciprocating rolling is performed, the moving blocks 118 a and 118 b are moved as described above to simultaneously press the teeth 122 a and 122 b of the gear rolling plates 104 a and 104 b against the outer peripheral surface of the workpiece 102 from above and below, thereby forming a gear shape on the workpiece 102 .

[0045] Figure 1 The workpiece rotating mechanism 108 shown has a servo motor (not shown) and rotates the workpiece 102 along the C axis (rotation direction around the Z axis) in synchronization with the vertical movement of the toothed plates 104a and 104b by the rack drive mechanisms 106a and 106b.

[0046] The spindle box drive mechanism 110 includes a spindle box (not shown) supported so as to be movable in the Z-axis direction, and a servo motor 128. The spindle box drive mechanism 110 moves the spindle box in the Z-axis direction, i.e., the axial direction of the workpiece 102, by driving the servo motor 128, and supports the workpiece 102 in a rotatable manner.

[0047] The tailstock drive mechanism 112 includes a tailstock 130 supported movably in the W-axis direction in the figure, and a servo motor 132. The tailstock 130 is disposed opposite to the headstock, and is moved in the axial direction of the workpiece 102 by the servo motor 132, and contacts the workpiece 102.

[0048] Here, in the NC gear rolling machine 100, the ball screws 116a and 116b are heated during operation and extend, thereby changing the axial position of the moving blocks 118a and 118b, and sometimes the initial position of the rolling operation is offset. If the initial position of the rolling operation is offset, the teeth 122a and 122b of the gear rolling plates 104a and 104b cannot be pressed simultaneously from the top and bottom on the outer peripheral surface of the workpiece 102 during reciprocating rolling, resulting in a decrease in processing accuracy.

[0049] In particular, the NC gear rolling machine 100 is a vertical gear rolling machine, so Figure 2As shown, one origin A in the control of the rack shaft of the rack drive mechanism 106a, 106b is on the rising end side, and the other origin B is on the falling end side. Therefore, the lengths of the rack shaft from the fixed portion, which is the reference for the elongation of the ball screw 116a, 116b, that is, the support bearings 126a, 126b, to the origins A and B are different. As a result, the elongation of the ball screw 116a, 116b due to thermal expansion also differs, resulting in a relative offset of the origin position. In addition, the elongation of the ball screw 116b of the rack drive mechanism 106b, which has a longer length from the fixed portion to the origin, becomes greater than the elongation of the ball screw 116a of the rack drive mechanism 106a.

[0050] Therefore, the NC gear rolling machine 100 of the present embodiment adopts a structure capable of correcting the phase shift caused by the thermal expansion of the ball screws 116 a and 116 b and rolling the workpiece 102 with high processing accuracy.

[0051] NC gear rolling machine 100 has Figure 2 The X-axis retracting end sensor (hereinafter referred to as the first sensor 134a), the Y-axis retracting end sensor (hereinafter referred to as the second sensor 134b), the X-axis advancing end sensor (hereinafter referred to as the third sensor 134c), and the Y-axis advancing end sensor (hereinafter referred to as the fourth sensor 134d) are shown. Each sensor 134a to 134d is a magnetic sensor (such as a Hall element) for detecting the position of the moving blocks 118a and 118b before the movement for rolling.

[0052] The first sensor 134a detects the position of one moving block 118a before the forward rolling movement (the starting position of the forward rolling). The second sensor 134b detects the position of the other moving block 118b before the forward rolling movement (the starting position of the forward rolling). The third sensor 134c detects the position of the moving block 118a indicated by the two-dot chain line C in the figure before the backward rolling movement (the starting position of the backward rolling). The fourth sensor 134d detects the position of the moving block 118b indicated by the two-dot chain line D in the figure before the backward rolling movement (the starting position of the backward rolling).

[0053] In addition, magnetic bodies are arranged near the ball screw nuts 120a and 120b of the moving blocks 118a and 118b. Therefore, the first sensor 134a and the third sensor 134c are arranged near the ball screw nut 120a of the moving block 118a, and the magnetic bodies are detected by the magnetic sensors. In addition, the second sensor 134b and the fourth sensor 134d are arranged near the ball screw nut 120b of the moving block 118b, and the magnetic bodies are detected by the magnetic sensors.

[0054] Figure 3 yes Figure 1 Functional block diagram of the NC gear rolling machine 100. The NC gear rolling machine 100 includes a control device 138. The control device 138 controls the operation of the NC gear rolling machine 100. The control device 138 includes a numerical control unit 140, a servo control unit 142, and a phase shift calculation unit 144. In addition, the phase refers to the rotation phase of the ball screws 116a and 116b, that is, it is converted into the position of the moving blocks 118a and 118b.

[0055] The position shift calculation unit 144 calculates the phase shift caused by the extension of the ball screws 116a and 116b at the start of the forward rolling based on the forward rolling start position of the moving blocks 118a and 118b before the forward rolling movement detected by the first sensor 134a and the second sensor 134b. In addition, the position shift calculation unit 144 calculates the phase shift caused by the extension of the ball screws 116a and 116b at the start of the backward rolling based on the backward rolling start position of the moving blocks 118a and 118b before the backward rolling movement detected by the third sensor 134c and the fourth sensor 134d.

[0056] The numerical control unit 140 calculates the correction amount of the servo motors 124a and 124b, and outputs the correction amount to the servo control unit 142 to correct the phase shift caused by the extension of the ball screws 116a and 116b at the start of reciprocating rolling, which is calculated by the position shift calculation unit 144. The servo control unit 142 outputs the correction amount output from the numerical control unit 140 as a drive signal to the servo motors 124a and 124b to correct the phase of the synchronous control of the servo motors 124a and 124b.

[0057] In this way, the control device 138 corrects the phase of the synchronous control according to the position of the moving blocks 118a and 118b detected by each sensor 134a to 134d, thereby adjusting the initial position of the rolling operation (calibrating the starting position of the rolling process). That is, the control device 138 synchronously controls the servo motors 124a and 124b, and corrects the axial position of the moving blocks 118a and 118b by changing the phase of the ball screws 116a and 116b, so that the teeth 122a and 122b of the toothed plates 104a and 104b can be pressed against the outer peripheral surface of the workpiece 102 from the top and the bottom at the same time.

[0058] Figure 4 It is shown Figure 1First, in the NC gear rolling machine 100, the forward rolling start position of the moving block 118a before forward rolling is detected by the first sensor 134a (step S100), and the forward rolling start position of the moving block 118b before forward rolling is detected by the second sensor 134b (step S102).

[0059] Next, the control device 138 corrects the phase shift caused by the elongation of the ball screws 116a and 116b at the start of the forward rolling based on the forward rolling start position of the moving blocks 118a and 118b detected by the first sensor 134a and the second sensor 134b, and then performs forward rolling (step S104).

[0060] Next, when the backward rolling is performed (step S106, "Yes"), the backward rolling start position of the moving block 118a before the backward rolling is detected by the third sensor 134c (step S108), and the backward rolling start position of the moving block 118b before the backward rolling is detected by the fourth sensor 134d (step S110). On the other hand, when the backward rolling is not performed in step S106 ("No"), the rolling process is terminated.

[0061] Next, the control device 138 corrects the phase shift caused by the extension of the ball screws 116a and 116b at the start of the backward rolling based on the backward rolling start position of the moving blocks 118a and 118b detected by the third sensor 134c and the fourth sensor 134d, and then performs the backward rolling (step S112). And, if the forward rolling is not performed (step S114, "No"), the rolling process is ended, and then if the forward rolling is performed ("Yes"), the above-mentioned step S100 is performed again.

[0062] As described above, in the NC gear rolling machine 100, the phase shift due to the extension of the ball screws 116a and 116b is corrected based on the positions of the moving blocks 118a and 118b detected by the sensors 134a to 134d, and then forward rolling and backward rolling are performed, thereby enabling rolling processing to be performed with high accuracy.

[0063] In the NC gear rolling machine 100, the rolling process can be performed with high processing accuracy using a simple configuration in which the sensors 134a to 134d are arranged and the phase of the synchronous control of the servo motors 124a and 124b is corrected by the control device 138, thereby suppressing an increase in cost.

[0064] In the above-described NC gear rolling machine 100, the first sensor 134a, the second sensor 134b, the third sensor 134c, and the fourth sensor 134d are arranged, but the present invention is not limited thereto, and only the first sensor 134a and the second sensor 134b may be arranged to provide a simpler structure.

[0065] In such a case, the control device 138 corrects the phase of the synchronous control of the servo motors 124a and 124b based on the positions of the moving blocks 118a and 118b detected by the first sensor 134a and the second sensor 134b at the start of the forward rolling, and then performs the forward rolling. Moreover, at the start of the backward rolling, the control device 138 only needs to regard the position of the moving block 118a after the forward rolling and the position of the moving block 118b as opposite to correct the phase shift caused by the elongation of the ball screws 116a and 116b. If this is the case, the forward rolling and backward rolling can be performed after the phase of the synchronous control of the servo motors 124a and 124b is corrected based on the positions of the moving blocks 118a and 118b detected by the first sensor 134a and the second sensor 134b.

[0066] Furthermore, in the above-mentioned NC gear rolling machine 100, only the second sensor 134b may be provided to make a simpler structure. In this case, the control device 138 calculates the extension of the ball screw 116b based on the position of the moving block 118b detected by the second sensor 134b at the start of the forward rolling. In addition, the control device 138 calculates the extension of the ball screw 116a based on the difference in length from the support bearings 126a, 126b on the rack shaft to the origins A, B on the control.

[0067] Furthermore, the control device 138 calculates the phase shift caused by the elongation of the ball screws 116a and 116b, corrects the phase of the synchronous control of the servo motors 124a and 124b in a manner to correct the phase shift, and then performs forward rolling. Furthermore, at the start of backward rolling, the control device 138 only needs to regard the position of the moving block 118a after the forward rolling and the position of the moving block 118b as being opposite to correct the phase shift caused by the elongation of the ball screws 116a and 116b.

[0068] With this configuration, forward rolling and backward rolling can be performed after the phase of the synchronous control of the servo motors 124a and 124b is corrected based on the position of the moving block 118b detected by the second sensor 134b, and the structure can be further simplified.

[0069] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the present invention is certainly not limited to the examples described. It is obvious that those skilled in the art can think of various variations or modifications within the scope of the claims, and it should be understood that these various variations or modifications also belong to the technical scope of the present invention.

[0070] Industrial Applicability

[0071] The present invention can be utilized as an NC gear rolling machine that forms a gear shape on a workpiece by rolling.

[0072] Description of Reference Numerals

[0073] 100: NC gear rolling machine; 102: workpiece; 104a, 104b: gear rolling plate; 106a, 106b: rack drive mechanism; 108: workpiece rotation mechanism; 110: spindle box drive mechanism; 112: tailstock drive mechanism; 114a, 114b: main body, 116a, 116b: ball screw; 118a, 118b: moving block; 120a, 120b: ball screw nut; 12 2a, 122b: teeth of the rolling plate; 124a, 124b, 128, 132: servo motors; 126a, 126b: supporting bearings; 130: tail stock; 134a: first sensor; 134b: second sensor; 134c: third sensor; 134d: fourth sensor; 138: control device; 140: numerical control unit; 142: servo control unit; 144: phase shift calculation unit.

Claims

1. An NC gear rolling machine that forms a gear shape on a workpiece by rolling, the NC gear rolling machine being characterized by comprising: a first ball screw and a second ball screw; A first moving block, which is moved by the first ball screw; A second moving block, which is moved by the second ball screw; A first tooth rolling plate, which is mounted on the first moving block; A second tooth rolling plate, which is mounted on the second moving block; A pair of servo motors, wherein the pair of servo motors enable the first tooth rolling plate and the second tooth rolling plate to move parallel to each other and in opposite directions; a control device for synchronously controlling the pair of servo motors; as well as two sensors, the two sensors detecting the positions of the first moving block and the second moving block before movement, The control device corrects the phase of the synchronous control according to the positions of the first moving block and the second moving block detected by the sensor.

2. The NC gear rolling machine according to claim 1, characterized in that: The NC gear rolling machine can perform reciprocating rolling, wherein the control device causes the first gear rolling plate and the second gear rolling plate to reciprocate to perform rolling. The NC gear rolling machine includes four sensors that respectively detect positions of the first moving block and the second moving block before reciprocating movement.

Images