JP2016036875A - Broach machine and manufacturing method of rack shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a broach machine whose relative phase between a first tooth and a second tooth which are formed at a workpiece can be easily set within a tolerance, and a manufacturing method of a rack shaft using the broach machine.SOLUTION: A broach machine has a clamp device; a tool holding device; a phase adjusting device 40; a cramp drive unit; and a machine main body which supports the tool holding device and the phase adjusting device 40. The cramp drive unit moves the cramp device to a broach which is attached to the tool holding device so that a second tooth is formed at a workpiece 100 which is cramped by the cramp device. The phase adjusting device 40 has: a jig 50 in which a fixed tooth 53 engaged with a first tooth 110 which is formed at the workpiece 100 is formed; an adjusting drive unit which presses the fixed tooth 53 to the first tooth 110 by moving the jig 50 to the workpiece 100; and a support part 44 which supports the workpiece 100 to which the fixed tooth 53 is pressed.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a broaching machine used for forming teeth on a shaft, and a method of manufacturing a rack shaft using the broaching machine.

  A conventional broaching machine is used, for example, to form teeth on a rack shaft that is one of components of an electric power steering apparatus. On the other hand, as one of the driving methods of the electric power steering apparatus, a dual pinion in which the first pinion shaft connected to the steering shaft and the second pinion shaft connected to the output shaft of the assist motor are respectively meshed with the rack shaft. The pinion formula is known. Patent Document 1 discloses an example of such an electric power steering apparatus.

  According to the rack shaft of the electric power steering apparatus, the plurality of first teeth meshed with the first pinion shaft and the plurality of second teeth meshed with the second pinion shaft are respectively provided in the rack. It is formed in different parts on the shaft.

  According to the conventional manufacturing method for manufacturing such a rack shaft, for example, a broaching machine having a function for a surface broach is used. This broaching machine has a tool holding device to which a tool is attached, a clamping device for clamping a workpiece, and a clamp driving device for moving the clamping device relative to the tool holding unit.

  According to the manufacturing method using this broaching machine, as an example, a rack shaft is manufactured from a workpiece through the following steps. First, the clamping device clamps the workpiece, and then the clamp driving device moves the workpiece together with the clamping device, thereby bringing the workpiece into contact with a tool for forming a plurality of first teeth, thereby allowing a plurality of workpieces to contact the workpiece. Forming a first tooth;

  Next, the clamping device unclamps the workpiece, and then the workpiece conveying device arranged separately from the broaching machine moves the unclamped workpiece with respect to the clamping device, and the part of the workpiece to be clamped by the clamping device Is set in the clamping device so that is set to a site for forming a plurality of second teeth. Next, the clamping device re-clamps the workpiece, and then the clamp driving device moves the workpiece together with the clamping device, thereby bringing the workpiece into contact with a tool for forming a plurality of second teeth, thereby allowing the workpiece to be Forming the second tooth.

JP 2013-35475 A

  By the way, when designing the rack shaft, a tolerance is set for a relative phase that is a phase difference between the phase of the first tooth around the central axis in the longitudinal direction of the rack shaft and the phase of the second tooth around the central axis. The

  On the other hand, according to the manufacturing method described above, since the workpiece transfer device moves the unclamped workpiece, for example, due to contact between the transfer device and the workpiece at that time, the phase around the central axis in the longitudinal direction of the workpiece May deviate from a predetermined phase. When the phase of the workpiece deviates as described above, in the next step, the plurality of second teeth may be formed on the workpiece with a phase deviated from the phase to be originally formed. When the phase at which the second tooth is formed in this way is shifted, the relative phase between the first tooth and the second tooth deviates from a preset tolerance. For example, the second pinion shaft is racked. There is a risk that it will not mesh properly with the shaft.

  Here, the problem has been studied by taking the rack shaft of the electric power steering device as an example, but the same problem as described above is possible as long as the shaft manufacturing method forms the first teeth and the second teeth in different processes. Is considered to occur.

  An object of the present invention is to provide a broaching machine in which the relative phase between the first tooth and the second tooth formed on the workpiece is easily within tolerance, and a method for manufacturing a rack shaft using the broaching machine. That is.

  [1] According to an independent form of the broaching machine, a clamping device for clamping and unclamping a work on which the first teeth are formed, and a tool for forming the second teeth on the work are attached. A tool holding device; a phase adjusting device that adjusts a phase of the first tooth in the workpiece in which the first teeth are formed and the second teeth are not formed; and the clamped by the clamp device A clamp driving device that moves the clamping device relative to the tool holding device so that the second teeth are formed on a workpiece, and a panel body that supports at least the tool holding device and the phase adjusting device, The phase adjusting device moves a jig with respect to the workpiece, and a jig on which fixed teeth that mesh with the first teeth formed on the workpiece are formed. And a more said fixed teeth and the adjustment drive for pressing the first tooth, the support portion for supporting the workpiece in which the stationary teeth are pressed.

  According to the broaching machine, for example, a workpiece on which the first teeth and the second teeth are formed can be manufactured through the following steps. Initially, the work in which the first tooth is formed and the second tooth is not formed is clamped by the clamping device. Next, the adjustment driving device of the phase adjusting device moves the jig with respect to the workpiece and presses the fixed teeth against the first teeth. At this time, since the clamping device unclamps the workpiece, the phase shift of the first tooth with respect to the fixed tooth is eliminated in a state where the workpiece on which the fixed tooth is pressed is supported by the support portion. The phase of the workpiece relative to the jig changes. For this reason, the phase around the central axis in the longitudinal direction of the workpiece is adjusted to a predetermined phase defined by the jig. The predetermined phase is defined in advance so that the second teeth are formed on the workpiece in an original phase to be formed on the workpiece.

  Next, the clamp device again clamps the workpiece whose phase has been adjusted in this manner, and the clamp driving device moves the clamp device relative to the tool holding device, whereby the second tool attached to the tool holding device. The workpiece comes into contact with the workpiece, and second teeth are formed on the workpiece.

  Thus, according to this broaching machine, since the second tooth is formed on the work after the phase of the work is adjusted by the phase adjusting device, the first tooth and the second tooth formed on the work are formed. It becomes easy for the relative phase with the tooth to fall within the tolerance.

  [2] According to one aspect dependent on the broaching machine, the phase adjusting device rotates the jig with respect to the board body around the work, thereby positioning the jig with respect to the work. It further has a rotary drive device for adjustment.

  According to this broaching machine, the relative phase between the first tooth and the second tooth of the workpiece is determined by the jig. For this reason, when the position of the jig around the workpiece changes, the relative relationship between the first tooth and the second tooth set when the fixed tooth of the jig is pressed against the first tooth of the workpiece. The phase changes. For this reason, according to this broaching machine which has a rotation drive device, the relative phase of the 1st tooth and the 2nd tooth can be set up for every work.

[3] According to one aspect dependent on the broaching machine, the phase adjusting device moves the jig relative to the workpiece by hydraulic pressure.
As an example of the form of the adjustment driving device, a form in which the jig is driven by electric power can be considered. In this case, since it is necessary to wire to a jig that rotates with respect to the board body, it takes time to handle the wiring in the manufacturing process of the broaching machine. On the other hand, since the adjustment drive device of [3] uses hydraulic pressure as its power source, the above-described problems do not occur.

  [4] According to one aspect dependent on the broaching machine, the support portion supports the workpiece from the back side of the portion where the first teeth are formed, and the jig has fixed teeth. When pressed against the first teeth, the workpiece is sandwiched between the support portion, and the broaching machine moves the phase adjusting device against the board body so that the phase adjusting device is separated from the work. It further has a position adjusting device to be moved.

  According to this broaching machine, when the fixed tooth of the jig is pressed against the first tooth of the workpiece, the workpiece is sandwiched between the jig and the support portion, so the posture of the workpiece is not correct even when the fixed tooth is pressed. It is difficult to become stable. On the other hand, according to such a configuration of the broaching machine, after the phase of the workpiece is adjusted by the jig and the workpiece is clamped by the clamping device, the movement of the workpiece for forming the second teeth is supported by the support portion. Disturbed by On the other hand, according to the broaching machine, after the clamping device clamps the workpiece, the phase adjusting device can be separated from the workpiece by the position adjusting device. For this reason, the effect of stabilizing the posture of the workpiece when the fixed tooth of the jig is pressed can be further obtained without impairing the function of the broaching machine that forms the second tooth.

  [5] According to an embodiment dependent on the broaching machine, the position adjusting device moves the workpiece relative to the clamping device when the jig and the support portion sandwich the workpiece. Thereby, it has the function to adjust the site | part of the said workpiece | work clamped by the said clamp apparatus.

  According to the broaching machine, for example, the second tooth can be formed on the workpiece through the following steps. After the phase of the workpiece with respect to the tool holding device is adjusted by the phase adjusting device, the position adjusting device adjusts the position of the workpiece to be clamped by the clamping device, and then the clamping device clamps the workpiece again. Then, the clamp driving device moves the clamp device relative to the tool holding device, so that the workpiece comes into contact with the second tool attached to the tool holding device, and the position adjusted by the position adjusting device is adjusted to the workpiece. In response, the second tooth is formed. Thus, according to this broaching machine, the position of the 2nd tooth formed in a work can be set up for every work.

  [6] According to an independent form of the manufacturing method of the rack shaft, the plurality of first teeth and the plurality of second teeth are formed at positions different from the plurality of first teeth in the axial direction. The plurality of second teeth are formed using the broaching machine according to any one of [1] to [5].

  According to the rack shaft manufactured by the present manufacturing method, the second teeth are formed on the rack shaft after the phase of the rack shaft is adjusted by the phase adjusting device. The relative phase between the tooth and the second tooth is easily accommodated within the tolerance.

  According to the broaching machine and the manufacturing method of the rack shaft, the relative phase between the first tooth and the second tooth formed on the workpiece is easily within the tolerance.

The lineblock diagram of the electric power steering device of an embodiment. The front view of the rack shaft of embodiment. The front view of the broaching machine of embodiment. The top view of the broaching machine of embodiment. Sectional drawing of the X5-X5 line | wire of FIG. Sectional drawing of the X6-X6 line | wire of FIG. Process drawing which shows the clamp process in the manufacturing method of embodiment. Process drawing which shows the phase adjustment process in the manufacturing method of embodiment. Process drawing which shows the phase adjustment process in the manufacturing method of embodiment. Process drawing which shows the phase adjustment process in the manufacturing method of embodiment. Process drawing which shows the position adjustment process in the manufacturing method of embodiment. Process drawing which shows the evacuation process in the manufacturing method of embodiment. Process drawing which shows the cutting process in the manufacturing method of embodiment. Process drawing which shows the cutting process in the manufacturing method of embodiment.

A configuration of a dual pinion type electric power steering apparatus 200 having a rack shaft 226 will be described with reference to FIG.
The steering device 200 includes a steering mechanism 220 that steers the steered wheel 250 based on an operation of the steering wheel 210, an assist mechanism 230 that assists the operation of the steering wheel 210, and a control device 260 that controls the assist mechanism 230. ing.

  The steering mechanism 220 has a steering shaft 221 that serves as a rotating shaft of the steering wheel 210. The steering shaft 221 has a column shaft 222 to which the steering wheel 210 is connected, an intermediate shaft 223 connected to the lower end portion of the column shaft 222, and a pinion shaft 224 connected to the lower end portion of the intermediate shaft 223. ing. The lower part of the pinion shaft 224 is connected to the rack shaft 226 via a rack and pinion mechanism 225. The steered wheels 250 are connected to both ends of the rack shaft 226 via tie rods 227 and knuckle (not shown). The rack and pinion mechanism 225 includes a plurality of teeth 224A formed on the pinion shaft 224 and a plurality of first teeth 226A formed on the rack shaft 226.

  According to this steering mechanism 220, when the steering wheel 210 is operated, the column shaft 222, the intermediate shaft 223, and the pinion shaft 224 rotate integrally. The rotational movement of the pinion shaft 224 is converted into movement in the longitudinal direction of the rack shaft 226 via the rack and pinion mechanism 225. As the rack shaft 226 moves, the steered wheels 250 are steered through the tie rods 227.

  The assist mechanism 230 has an assist motor 231. The output shaft of the assist motor 231 is connected to the pinion shaft 233 via the speed reducer 232. The lower part of the pinion shaft 233 is connected to the rack shaft 226 via a rack and pinion mechanism 234. The rack and pinion mechanism 234 includes a plurality of teeth 233A formed on the pinion shaft 233 and a plurality of second teeth 226B formed on the rack shaft 226.

  According to the assist mechanism 230, when the control device 260 drives the assist motor 231 based on the torque applied to the steering shaft 221, the rotational force of the assist motor 231 rotates the pinion shaft 233 via the speed reducer 232. The rotational motion of the pinion shaft 233 is applied to the rack shaft 226 as an assisting force via the speed reducer 232 and the rack and pinion mechanism 234. The assist force assists the operation of the steering wheel 210.

The structure of the rack shaft 226 will be described with reference to FIG.
The rack shaft 226 has a plurality of first teeth 226A and a plurality of second teeth 226B formed at different positions in the axial direction. The plurality of first teeth 226 </ b> A and the plurality of second teeth 226 </ b> B are formed on the outer periphery of the rack shaft 226 so as to have a predetermined relative phase in the circumferential direction of the rack shaft 226. Note that the relative phases of the plurality of first teeth 226A and the plurality of second teeth 226B of the rack shaft 226 shown in FIG. 2 are “0” degrees.

  With reference to FIGS. 3-6, the structure of the broaching machine 1 for forming the 1st tooth | gear 226A and the 2nd tooth | gear 226B in the rack shaft 226 is demonstrated. In FIG. 3, the tool holding device 20 is omitted.

  As shown in FIG. 3, the broaching machine 1 includes a board body 10, a tool holding device 20, a clamping device 30, a clamp driving device 35, and a phase adjusting device 40. The board body 10 is installed on a floor surface (not shown) and supports each device of the broaching machine 1.

  The tool holding device 20 is provided with a broach B (see FIG. 4) which is a tool for forming one or more teeth on the surface of a workpiece (not shown). The broach B has a number of blades corresponding to the number of teeth to be formed. The broach B is replaced with one corresponding to the number of teeth to be formed and the interval between the teeth.

  The clamp device 30 includes a first clamp 31, a second clamp 32, and a contact portion 33. The clamping device 30 clamps and unclamps the workpiece by sandwiching the workpiece between the first clamp 31 and the second clamp 32.

  The clamp drive device 35 has a motor (not shown) and a mechanism for converting the rotation of the motor into a linear motion, and the clamp device 30 with respect to the tool holding device 20 so that teeth are formed on the workpiece clamped by the clamp device 30. Move.

  The phase adjustment device 40 includes a housing 41, a rotating body 42, a support portion 44, a jig 50, a hydraulic adjustment drive device 60, a rotation drive device 70 that changes the phase of the jig 50, and the jig 50. Has a position adjusting device 80 for moving the workpiece with respect to the axial direction of the workpiece.

  As shown in FIG. 5, the rotary drive device 70 includes a servo motor 71, a worm 72, and a gear 73. The worm 72 and the gear 73 constitute a reduction gear. The rotation of the servo motor 71 rotates the rotating body 42 of the phase adjusting device 40 that is fixed to the gear 73 via the worm 72 and the gear 73.

  As shown in FIG. 3, the position adjusting device 80 includes a servo motor 81 and a ball screw 82. The ball screw 82 is attached on the board body 10. The ball screw 82 extends toward the clamp device 30. When the servo motor 81 rotates, the ball screw 82 moves the housing 41 attached to the ball screw 82 in a direction approaching the clamp device 30 and a direction away from the clamp device 30.

  As shown in FIG. 6, the housing 41 has a cylindrical shape. The rotating body 42 is attached inside the housing 41. The rotating body 42 has a cylindrical shape. The rotating body 42 can be rotated inside the housing 41 by the rotation driving device 70.

  A circumferential groove 42 </ b> A is formed on the outer periphery of the rotating body 42. The rotating body 42 is formed with an oil hole 42 </ b> B that communicates the circumferential groove 42 </ b> A and a hole 43 formed on the inner peripheral surface of the rotating body 42.

The support portion 44 is attached to the inner peripheral surface of the rotating body 42. The support portion 44 protrudes from the inner peripheral surface of the rotating body 42 toward the central axis of the rotating body 42.
The jig 50 is fitted in a hole 43 formed in the rotating body 42. The jig 50 includes a jig main body 51 positioned on the bottom surface side of the hole 43 and a tooth block 52 positioned on the opening side of the hole 43 relative to the jig main body 51. The jig body 51 and the tooth block 52 are fixed to each other. A hydraulic chamber 61 is formed between the bottom surface of the hole 43 and the jig body 51.

  The tooth block 52 has fixed teeth 53 formed on the center axis side of the rotating body 42. The tooth block 52 is detachably attached to the jig body 51. The tooth block 52 is disposed at a position facing the support portion 44 across the central axis of the rotating body 42.

  The adjustment drive device 60 has an oil pump (not shown). When the adjustment drive device 60 is driven and oil is supplied to the phase adjustment device 40, the oil is supplied to the hydraulic chamber 61 via the circumferential groove 42A and the oil hole 42B. For this reason, the jig 50 moves to the center axis side of the rotating body 42. On the other hand, when the adjustment driving device 60 is driven and the oil is discharged from the phase adjusting device 40, the oil is discharged from the hydraulic chamber 61 through the circumferential groove 42A and the oil hole 42B. For this reason, the jig 50 moves to the outer peripheral side of the rotating body 42.

A manufacturing method of the rack shaft 226 will be described with reference to FIGS. 7, 8, and 11 to 13 omit the tool holding device 20.
The manufacturing method of the rack shaft 226 includes a first tooth cutting process and a second tooth cutting process.

  In the first tooth cutting step, a plurality of first teeth 110 (corresponding to the first teeth 226A in FIG. 2) on the first end 101 side from the center in the axial direction of the cylindrical workpiece using the broaching machine 1. ) Is formed.

  In the second tooth cutting process, a plurality of first teeth 110 are formed by the first tooth cutting process, and a plurality of second teeth (corresponding to the second teeth 226B in FIG. 2) are not formed. A plurality of second teeth are formed on the workpiece 100 that is 226. The second tooth cutting process includes a preparation process, a clamping process, a phase adjusting process, a position adjusting process, a retracting process, and a cutting process.

  In the preparation step, a broach B for forming a plurality of second teeth on the workpiece 100 is attached to the tool holding device 20. A tooth block 52 having a fixed tooth 53 that meshes with the first tooth 110 is attached to the jig 50. Further, the phase of the jig 50 with respect to the workpiece 100 is adjusted by rotating the jig 50 with respect to the panel body 10 by the rotation driving device 70. The rotation amount of the jig 50 can be set to a desired rotation amount by changing the drive amount of the servo motor 71 of the rotation driving device 70.

  As shown in FIG. 7, in the clamping process, the workpiece 100 on which the plurality of first teeth 110 are formed is clamped by the clamping device 30. Specifically, in a state where the second end portion 102 of the workpiece 100 is abutted against the abutting portion 33, the first clamp 31 and the second clamp 32 are brought close to each other. As a result, a portion of the workpiece 100 near the second end 102 opposite to the first end 101 is clamped by the clamping device 30. Moreover, it clamps so that the surface by which the 2nd tooth | gear is formed is exposed. At this time, the phase adjusting device 40 is located on the first end 101 side, which is the end opposite to the second end 102 of the work 100, at a position away from the work 100.

  Next, as shown in FIG. 8, in the phase adjustment step, the position adjustment device 80 moves the phase adjustment device 40 toward the workpiece 100, and a portion where the plurality of first teeth 110 of the workpiece 100 are formed. It is inserted into the rotating body 42. At this time, as shown in FIG. 9, the support surface 44 </ b> A of the support portion 44 is in contact with the outer peripheral surface of the workpiece 100. That is, the support portion 44 supports the workpiece 100 from the back side of the portion where the first teeth 110 are formed.

  Next, the clamping device 30 unclamps the workpiece 100, and the tooth block 52 moves toward the center of the rotating body 42 by the adjustment driving device 60. For this reason, as shown in FIG. 10, the fixed teeth 53 of the tooth block 52 are pressed against some of the plurality of first teeth 110. For this reason, the workpiece 100 is sandwiched between the jig 50 and the support portion 44. At this time, since the clamping device 30 unclamps the workpiece 100, the phase between the fixed teeth 53 and the first teeth 110 in a state where the workpiece 100 to which the fixed teeth 53 are pressed is supported by the support portion 44. The phase of the workpiece 100 with respect to the jig 50 changes so that the deviation is eliminated. For this reason, the phase of the first tooth 110 with respect to the tool holding device 20 is adjusted to the phase defined by the jig 50.

  Next, as illustrated in FIG. 11, in the position adjustment step, the phase adjustment device 40 is positioned in the position adjustment device in a state where the fixed teeth 53 and some of the plurality of first teeth 110 are engaged with each other. By 80, it moves in the direction away from the clamping device 30. Thereby, the 2nd end part 102 of the workpiece | work 100 leaves | separates from the abutting part 33, and the position of the axial direction with respect to the clamp apparatus 30 of the workpiece | work 100 is adjusted. The movement amount of the workpiece 100 can be set to a desired movement amount by changing the drive amount of the servo motor 81 of the position adjusting device 80.

  Next, the oil in the hydraulic chamber 61 is discharged by the adjustment driving device 60, and the fixed teeth 53 of the tooth block 52 are separated from the workpiece 100. In addition, the workpiece 100 whose phase and position in the axial direction are adjusted is clamped again by the clamping device 30. Then, as shown in FIG. 12, in the retracting process, the phase adjusting device 40 is moved away from the clamping device 30 by the position adjusting device 80.

  Next, as shown in FIG. 13, in the cutting process, the clamp driving device 35 rotates the workpiece 100 around the clamped position to raise the workpiece 100. Then, as shown in FIG. 14, the workpiece 100 is translated so that the surface of the workpiece 100 contacts the broach B of the tool holding device 20, and a plurality of second teeth are formed on the workpiece 100.

The broaching machine 1 has the following effects.
(1) According to the broaching machine 1, when the fixed teeth 53 are pressed against the first teeth 110, the clamping device 30 unclamps the workpiece 100. For this reason, in a state where the workpiece 100 to which the fixed teeth 53 are pressed is supported by the support portion 44, the phase difference of the first teeth 110 with respect to the fixed teeth 53 is eliminated. The phase changes. For this reason, the phase around the central axis in the longitudinal direction of the workpiece 100 is adjusted to a predetermined phase defined by the jig 50.

  Next, the clamping device 30 re-clamps the workpiece 100 whose phase has been adjusted in this way, and the clamp driving device 35 moves the clamping device 30 with respect to the tool holding device 20 so that the workpiece 100 is attached to the tool holding device 20. The work 100 comes into contact with the broach B that is in contact, and second teeth are formed on the work 100.

  As described above, according to the broaching machine 1, the second teeth are formed on the workpiece 100 after the phase of the workpiece 100 is adjusted by the phase adjusting device 40. The relative phase between the tooth 110 and the second tooth is easily accommodated within the tolerance.

  (2) According to the broaching machine 1, the relative phase between the first tooth 110 and the second tooth of the workpiece 100 is determined by the jig 50. For this reason, when the position of the jig 50 around the workpiece 100 changes, the first teeth 110 set when the fixed teeth 53 of the jig 50 are pressed against the first teeth 110 of the workpiece 100. The relative phase with the second tooth changes. For this reason, according to the broaching machine 1 having the rotation drive device 70, the relative phase between the first tooth 110 and the second tooth can be set for each workpiece 100.

  (3) As an example of the form of the adjustment drive device, a form in which the jig 50 is driven by electric power can be considered. In this case, since it is necessary to wire the jig 50 that rotates with respect to the board body 10, it takes time to handle the wiring in the manufacturing process of the broaching machine 1. On the other hand, since the adjustment drive device 60 uses hydraulic pressure as its power source, the above-described problem does not occur.

  (4) According to the broaching machine 1, when the fixed tooth 53 of the jig 50 is pressed against the first tooth 110 of the workpiece 100, the workpiece 100 is sandwiched between the jig 50 and the support portion 44. Even if 53 is pressed, the posture of the workpiece 100 is unlikely to become unstable. On the other hand, according to such a configuration of the broaching machine 1, after the phase of the workpiece 100 is adjusted by the jig 50 and the workpiece 100 is clamped by the clamping device 30, the workpiece for forming the second teeth. 100 movement is prevented by the support 44. On the other hand, according to the broaching machine 1, the phase adjusting device 40 can be separated from the workpiece 100 by the position adjusting device 80 after the clamping device 30 clamps the workpiece 100. For this reason, the effect of stabilizing the posture of the workpiece 100 when the fixed teeth 53 of the jig 50 are pressed can be further obtained without impairing the function of the broaching machine 1 that forms the second teeth.

  (5) According to the broaching machine 1, after the phase of the workpiece 100 with respect to the tool holding device 20 is adjusted by the phase adjusting device 40, the position adjusting device 80 adjusts the part of the workpiece 100 clamped by the clamping device 30; Next, the clamping device 30 clamps the workpiece 100 again. Then, when the clamp driving device 35 moves the clamp device 30 relative to the tool holding device 20, the work 100 comes into contact with the broach B attached to the tool holding device 20, and the position adjusting device 80 is brought into contact with the work 100. The second tooth is formed according to the position adjusted by. As described above, according to the broaching machine 1, the position of the second tooth formed on the workpiece 100 can be set for each workpiece 100.

  The specific form that the broaching machine can take is not limited to the form exemplified in the above embodiment. The broaching machine can take various forms different from the above-described embodiment as long as the object of the present invention is achieved. The modification of the said embodiment shown below is an example of the various forms which this broaching machine can take.

  -In a 2nd tooth cutting process, rotation of the jig | tool 50 by the rotational drive apparatus 70 can also be performed in a phase adjustment process. That is, in a state where the fixed teeth 53 and the first teeth 110 are engaged with each other by the adjustment driving device 60, the rotation driving device 70 changes the phase of the workpiece 100 to a desired phase.

The adjustment driving device 60 can be changed to an electric adjustment driving device.
The rotary drive device 70 can be omitted. In this case, for example, the operator can make a change so as to adjust the phase of the jig 50.

The position adjusting device 80 can be omitted. In this case, for example, it can be changed so that the operator moves the phase adjustment device 40.
A slide rail may be used instead of the ball screw 82 of the position adjusting device 80. In short, any configuration can be adopted as long as the position adjustment device 80 can move the phase adjustment device 40 in the axial direction of the workpiece 100.

  The broaching machine 1 can also form one or a plurality of second teeth on the workpiece 100 other than the rack shaft 226. In this case, the first tooth 110 can be applied to one workpiece 100.

-A 1st tooth cutting process can also be performed with the broaching machine different from the broaching machine 1. FIG.
The first teeth 110 can be formed by a cutting machine that does not use the broach B.

  DESCRIPTION OF SYMBOLS 1 ... Broaching machine, 10 ... Board body, 20 ... Tool holding device, 30 ... Clamping device, 35 ... Clamp driving device, 40 ... Phase adjusting device, 50 ... Jig, 53 ... Fixed tooth, 60 ... Adjustment driving device, 70 ... Rotation drive device, 80 ... Position adjustment device, 100 ... Workpiece, 110 ... First tooth.

Claims (6)

A clamping device for clamping and unclamping the workpiece on which the first teeth are formed;
A tool holding device to which a tool for forming second teeth on the workpiece is attached;
A phase adjusting device that adjusts a phase of the first tooth in the workpiece in which the first tooth is formed and the second tooth is not formed;
A clamp driving device that moves the clamping device relative to the tool holding device such that the second teeth are formed on the workpiece clamped by the clamping device;
A board body that supports at least the tool holding device and the phase adjusting device;
The phase adjusting device includes: a jig on which a fixed tooth that meshes with the first tooth formed on the workpiece; and a jig that moves the jig relative to the workpiece to move the fixed tooth to the first workpiece. A broaching machine comprising: an adjustment driving device that presses against one tooth; and a support that supports the workpiece against which the fixed tooth is pressed. The broach according to claim 1, wherein the phase adjusting device further includes a rotation driving device that adjusts a position of the jig with respect to the work by rotating the jig with respect to the panel main body around the work. Board. The broaching machine according to claim 2, wherein the phase adjusting device moves the jig with respect to the workpiece by hydraulic pressure. The support portion supports the workpiece from the back side of the portion where the first teeth are formed,
The jig is sandwiched between the workpiece and the support portion by pressing the fixed teeth against the first teeth.
The broaching machine according to any one of claims 1 to 3, wherein the broaching machine further includes a position adjusting device that moves the phase adjusting device relative to the board body so that the phase adjusting device is separated from the workpiece. . The position adjusting device moves the workpiece relative to the clamping device when the jig and the support portion sandwich the workpiece, thereby moving the workpiece part to be clamped by the clamping device. The broaching machine according to claim 4, which has a function of adjusting. A plurality of first teeth, and a method for manufacturing a rack shaft in which a plurality of second teeth are formed at positions different from the plurality of first teeth in the axial direction,
The manufacturing method of the rack shaft which forms the said several 2nd tooth | gear using the broaching machine as described in any one of Claims 1-5.