JP2013244488A - Rolling die and rolling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling die and a rolling method that can prevent the occurrence of slipping between a workpiece and the rolling die.SOLUTION: A rolling die 1 includes a rolling section 20 circumferentially moving relative to a shaft-like workpiece to plastically deform the outer peripheral surface of the workpiece, and driving sections 30, 40 having projections 31, 41 biting into portions, not in contact with the rolling section 20, out of the outer peripheral surface of the workpiece to rotationally drive the workpiece when the rolling section 20 plastically deforms the workpiece.

Description

  The present invention relates to a rolling die used for a rolling process, and a rolling method using the same.

  Rolling is a processing method in which a pair of rolling dies arranged with an axial workpiece sandwiched therebetween is moved relative to the circumferential direction to plastically deform the workpiece to form an annular groove or the like. In such a rolling process, the shaft-like workpiece is rotatably supported at both ends, and is rotationally driven in the circumferential direction by contact resistance with the rolling die. Here, depending on the target shape of the workpiece, the deformation resistance of the workpiece becomes larger than the contact resistance with the rolling die, and slippage may occur between the workpiece and the rolling die.

  Thus, for example, Patent Document 1 discloses a rolling method in which a pinion gear formed on the outer peripheral surface of a center that supports a workpiece and a rack tooth formed on the upper surface of a rolling die are engaged. Further, for example, Patent Document 2 discloses a rolling processing machine including a driving unit that directly rotates a workpiece. According to such a configuration, during the rolling process, the rotation of the workpiece is synchronized with the movement of the rolling die, and the occurrence of slippage between the two members can be suppressed.

JP 09-262636 A JP 2001-286966 A

  Further, in rolling processing, there is a demand to reduce the cost required for equipment including a rolling die while preventing the workpiece and the rolling die from slipping. On the other hand, in Patent Document 1, it is necessary to form a rolling die as wide as the rack teeth, and in Patent Document 2, a driving unit and a control unit for synchronizing the driving unit are required, which increases the equipment cost. Concerned.

  The present invention has been made in view of such circumstances, and provides a rolling die and a rolling method capable of preventing the occurrence of slippage between a workpiece and the rolling die. With the goal.

  (Claim 1) A rolling die according to the present invention includes a rolling part that plastically deforms an outer peripheral surface of the workpiece by moving relative to an axial workpiece in a circumferential direction, and the rolling part. Includes a driving portion having a protrusion that bites into a portion of the outer peripheral surface of the workpiece that is not in contact with the rolling portion and rotationally drives the workpiece when the workpiece is plastically deformed.

(Claim 2) In addition, the rolling section includes an introduction tooth that is a starting end for plastically deforming the workpiece, and a widening tooth that widens an axial width of a deformed portion of the workpiece, and the drive The part may be provided side by side with the widened part in the width direction.
(Claim 3) Further, the driving unit may be provided inside a range in the width direction in which the rolling unit is provided in the rolling die.

(Claim 4) Moreover, you may make it the said drive part detachably fix with respect to the base in which the said rolling part was provided.
(Claim 5) Further, the rolling portion is a recess formed with a tooth height lower than both ends in the width direction so as to be in non-contact with the workpiece at the center in the width direction when the workpiece is plastically deformed. The drive unit may be provided inside the concave portion of the rolling unit.

  (Claim 6) In the rolling method according to the present invention, a pair of rolling dies disposed with a shaft-shaped workpiece sandwiched therebetween are moved relative to each other in the circumferential direction, and the rolling part of the rolling dies is moved to the workpiece. The outer peripheral surface of the workpiece is plastically deformed, and the protrusion of the driving portion provided on the rolling die bites into a portion of the outer peripheral surface of the workpiece that is not in contact with the rolling portion, thereby rotating the workpiece. Let

  (Claim 1) According to the present invention, since the protrusion of the drive portion bites into the outer peripheral surface of the workpiece not in contact with the rolling portion, the workpiece is rotationally driven in synchronization with the movement of the rolling die. It will be. For this reason, it is possible to prevent slippage between the workpiece and the rolling die. Further, when the deformation resistance of the workpiece increases, the pressure applied by the rolling die also increases, and accordingly, the protrusion of the drive unit bites into the outer peripheral surface of the workpiece. Therefore, since the contact resistance between the workpiece and the rolling die can be increased even in a state where slippage is likely to occur, the occurrence of slippage can be reliably suppressed.

  (Claim 2) According to the present invention, the drive part is provided side by side with the widening teeth of the rolling part in the width direction. Here, in the rolling process, since the deformation resistance of the workpiece increases in the process of expanding the axial width of the deformed portion of the workpiece, slipping is particularly likely to occur. Therefore, by adopting the above-described configuration, the workpiece can be rotationally driven during rolling with the widening teeth, so that the occurrence of slip can be efficiently suppressed.

  (Claim 3) According to the present invention, the drive section is provided inside the range in the width direction of the rolling section. Here, since the driving portion causes the protrusion to bite into the outer peripheral surface of the workpiece when the workpiece is rotationally driven, a biting mark may remain on the outer peripheral surface of the workpiece depending on the pressure of the rolling die. Therefore, by adopting the configuration as described above, a portion of the rolling portion that is located on the rear end side of the rolling die with respect to the drive portion comes into contact with the outer peripheral surface of the workpiece that has been bitten by the protrusion. The bite mark can be removed. Thereby, the finished surface of the product by a rolling process can be made higher quality.

  (Claim 4) According to the present invention, since the drive unit is detachably fixed to the base of the rolling die, only the drive unit can be replaced. As a result, it is possible to install the drive unit according to the application, for example, by appropriately changing the shape of the protrusion. Further, in the rolling process, since the product is mass-produced by the same rolling die, the protrusion of the driving unit may be worn and the contact resistance may be reduced. Therefore, by exchanging only the drive unit, it is possible to maintain a state in which the workpiece is favorably rotated.

  (Claim 5) According to the present invention, since the driving portion is provided inside the concave portion of the rolling portion, the workpiece is reliably driven to rotate in a process in which the deformation resistance of the workpiece increases in the rolling process. be able to. In addition, even when the drive unit leaves a bite mark on the outer peripheral surface of the workpiece, the bite mark is removed by a rolling part located on the rear end side of the rolling die from the drive part, for example, a finishing part. be able to. Thereby, the finished surface of the product by a rolling process can be made higher quality.

(Claim 6) According to the present invention, since the protrusion of the driving portion bites into the outer peripheral surface of the workpiece, the workpiece is rotationally driven in synchronization with the movement of the rolling die. For this reason, it is possible to prevent slippage between the workpiece and the rolling die. Further, when the deformation resistance of the workpiece increases, the pressure applied by the rolling die also increases, and accordingly, the protrusion of the drive unit bites into the outer peripheral surface of the workpiece. Therefore, since the contact resistance between the workpiece and the rolling die can be increased even in a state where slippage is likely to occur, the occurrence of slippage can be reliably suppressed.
Moreover, it can apply similarly to the rolling method of this invention also about the other characteristic part in a rolling die. In this case, the same effect is obtained.

It is a side view which shows the rolling process using the rolling die in embodiment. It is a figure which shows the workpiece in which the annular groove was formed by the rolling process. It is a top view which shows a rolling die. It is AA sectional drawing of the rolling die in FIG. It is BB sectional drawing of the rolling die in FIG. It is sectional drawing of the width direction which shows the introduction process in a rolling process. It is sectional drawing of the width direction which shows the widening process in a rolling process.

<Embodiment>
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying a rolling die and a rolling method of the present invention will be described below with reference to the drawings. Here, the rolling dies of the present embodiment are a pair of flat dies arranged with a shaft-shaped workpiece W interposed therebetween as shown in FIG. The pair of rolling dies are relatively moved in the circumferential direction of the workpiece W during the rolling process, thereby plastically deforming the workpiece W to form an annular groove or the like. In the present embodiment, an annular groove is formed in the workpiece W by rolling, and the annular groove of the workpiece W is processed to a target groove width L and groove depth D as shown in FIG. Shall.

(Configuration of rolling dies)
As shown in FIG. 3, the rolling die 1 of the present embodiment includes a pedestal 10, a rolling unit 20, a first drive unit 30, and a second drive unit 40. The pedestal 10 is a main body member of the rolling die 1 and is formed in a rectangular parallelepiped shape as a whole, and is supported by a slider of a rolling disk (not shown) during the rolling process. Further, the pedestal 10 is provided with a first mounting groove 11 and a second mounting groove 12 provided to mount a first driving unit 30 and a second driving unit 40, which will be described later, on the upper surface facing the outer peripheral surface of the workpiece W, respectively. have.

  The first mounting groove 11 is disposed away from the rolled portion 20, and the second mounting groove 12 is disposed at the center in the width direction of the rolled portion 20. Each of the mounting grooves 11 and 12 is formed in a rectangular shape extending in the rolling direction (the longitudinal direction of the rolling die 1 and the left-right direction in FIG. 3). The first mounting groove 11 has a plurality of knock pin through-holes 11 a penetrating the groove bottom surface and the lower surface (back surface) of the base 10. Similar to the first mounting groove 11, the second mounting groove 12 has a plurality of through holes 12 a.

  The rolling part 20 is integrally provided on the upper surface of the base 10 and is a part that plastically deforms the outer peripheral surface of the workpiece W by moving relative to the workpiece W in the circumferential direction during the rolling process. is there. The rolled portion 20 is formed of a steel material such as SKD that has been heat-treated to improve wear resistance. The rolling portion 20 includes an introduction tooth 21, a widening tooth 22, a finishing tooth 23, and a concave portion 24 in order from the rolling processing start end side (the right side in FIG. 3).

  The introduction tooth 21 is a starting end that plastically deforms the workpiece W, and is a rolling tooth that causes the rolling die 1 to bite against the outer peripheral surface of the workpiece W. The introduction tooth 21 has a pointed tip and a cross-sectional shape in the width direction is formed in an inverted V shape. Further, the tooth height of the introduction tooth 21 becomes a height corresponding to the groove depth D of the annular groove of the workpiece W from the start end side to the rear end side (left side in FIG. 3) of the rolling die 1. It is gradually increased.

  The widening tooth 22 is a rolling tooth that is connected to the rear end side of the introduction tooth 21 and widens the axial width of the deformed portion of the workpiece W. In this embodiment, in order to form an annular groove in the workpiece W, the widening teeth 22 come into contact with both groove side surfaces of the narrow annular groove formed by the introduction teeth 21 up to the groove depth D. A pair of tooth surfaces is provided so as to expand to the groove width L. Further, the tooth height H1 of the widening tooth 22 is set to be a height corresponding to the groove depth D of the annular groove of the workpiece W at both ends in the width direction, and contacts the bottom surface of the annular groove during rolling. It is supposed to be.

  Moreover, the widening tooth | gear 22 has the recessed part 22a formed so that tooth height might become low gradually toward the center part from the width direction both ends. More specifically, as shown in FIG. 4, the recess 22 a is set such that the tooth height H <b> 2 is lower than the tooth height H <b> 1 at both ends in the width direction. With such a configuration, when the workpiece W is plastically deformed, the widening teeth 22 are in contact with only the upper surfaces of both end portions in the width direction, and are not in contact with the workpiece W at the central portion where the recess 22a is formed. The above-described second mounting groove 12 of the pedestal 10 is formed in the flat portion inside the recess 22a.

  The finishing tooth 23 is a rolled tooth that is connected to the rear end side of the widening tooth 22 and is formed into an outer peripheral shape corresponding to the target shape of the annular groove of the workpiece W. That is, the finish teeth 23 are formed so that the tooth width corresponds to the groove width L of the annular groove and the tooth height corresponds to the groove depth D of the annular groove. In this way, the finish teeth 23 come into contact with the groove bottom surface and both groove side surfaces of the ring groove before finishing formed by the widening teeth 22 during rolling, and each surface of the ring groove is leveled. It has an outer peripheral shape that adjusts to the target shape.

  When the rolling unit 20 plastically deforms the workpiece W, the first driving unit 30 and the second driving unit 40 bite into a part of the outer peripheral surface of the workpiece W that is not in contact with the rolling unit 20. This is the part that drives W to rotate. More specifically, the first drive unit 30 and the second drive unit 40 are formed in a rectangular parallelepiped shape as a whole, and knurled portions 31 and 41 (corresponding to “projections” of the present invention) are provided on the upper surfaces of the first drive unit 30 and the second drive unit 40, respectively. Is formed. The knurled portions 31 and 41 have a jagged shape extending in a direction orthogonal to the rolling direction.

  Further, as shown in FIG. 5, a plurality of pin holes 32 and 42 are formed on the back surfaces of the first drive unit 30 and the second drive unit 40. And the 1st drive part 30 is inserted in the 1st attachment groove | channel 11 of the base 10, and a knock pin is inserted and fixed to the some pin hole 32 each connected with the some through-hole 11a. Similarly, the 2nd drive part 40 is engage | inserted by the 2nd attachment groove 12 of the base 10, and a knock pin is inserted in the some pin hole 42 each connected with the some through-hole 12a, and is fixed so that attachment or detachment is possible.

  Thus, the 1st drive part 30 and the 2nd drive part 40 are positioned and fixed with respect to the base 10, and are provided along with the widening tooth | gear 22 and the width direction, as shown in FIG. Furthermore, the first drive unit 30 and the second drive unit 40 are located closer to the center than the rear end portion of the widening tooth 22 and the end portion in the width direction of the finish tooth 23, that is, the rolling portion 20 in the rolling die 1. Is provided inside the range R in the width direction.

  In addition, the first driving unit 30 is arranged so that the upper end portion of the knurled portion 31 protrudes from the upper surface of the pedestal 10 as shown in FIGS. 4 and 5 when being fixed to the pedestal 10. Thereby, the knurled portion 31 is configured to bite into an unprocessed portion of the outer peripheral surface of the workpiece W during the rolling process. On the other hand, the second drive unit 40 is arranged so that the upper end portion of the knurled portion 41 protrudes from the upper surface of both end portions in the width direction of the widening teeth 22 in a state of being fixed to the base 10. Thereby, the knurled part 41 is configured to bite into the groove bottom surface of the annular groove formed by a part of the introduction teeth 21 and the widening teeth 22 in the outer peripheral surface of the workpiece W during the rolling process.

(Grooving with a rolling die)
Next, a rolling method for performing grooving on the workpiece W using the above-described rolling die 1 will be described. First, a pair of rolling dies 1 are set apart by the diameter of the workpiece W so that the rolling parts 20 face the slider of the rolling machine. The pair of rolling dies 1 are relatively moved to one side and the other side in the rolling direction during the rolling process. Next, a cylindrical workpiece W is disposed between the pair of rolling dies 1 and both ends thereof are rotatably supported.

  When the rolling process is started, the pair of rolling dies 1 slides in opposite directions at the same speed while maintaining the parallel state of the opposing surfaces (the upper surface of the base 10). Along with this, the workpiece W in contact with the upper surface of the base 10 is rotationally driven. Thereafter, in the rolling process introducing step, the tip of the introduction tooth 21 of the rolled portion 20 bites into the workpiece W, and the groove depth of the annular groove formed on the outer peripheral surface of the workpiece W gradually increases. It becomes deeper (see Fig. 1).

  In this introduction process, when the rolling die 1 is moved by a predetermined amount, the knurled portion 31 of the first drive unit 30 starts to bite into the outer peripheral surface of the workpiece W as shown in FIG. Thereby, in addition to the frictional force received from each of the base 10 and the introduction tooth 21, the workpiece W is applied with a driving force in the circumferential direction by the biting of the knurled portion 31, and is rotated in synchronization with the movement of the rolling die 1. Is maintained. Then, the annular groove in the workpiece W is plastically deformed to the target groove depth D by the rear end portion of the introduction tooth 21.

  Next, in the widening step of the rolling process, as shown in FIG. 7, the pair of tooth surfaces of the widening teeth 22 come into contact with both groove side surfaces of the annular groove and gradually widen to the target groove width L. The workpiece W is plastically deformed. Thereafter, when the rolling die 1 moves relative to the workpiece W by a predetermined amount, the workpiece W passes through the end of the knurling portion 31 and is separated from the first driving portion 30, and the knurling of the second driving portion 40 is performed. The part 41 bites into the groove bottom surface of the annular groove formed by a part of the introduction tooth 21 and the widening tooth 22 in the outer peripheral surface of the workpiece.

  Accordingly, the workpiece W is applied with a driving force in the circumferential direction by the biting of the knurled portion 41, and the rotation synchronized with the movement of the rolling die 1 is maintained. Then, the annular groove in the workpiece W is plastically deformed to the target groove width L by the rear end portion of the widening tooth 22. Further, the portion of the outer peripheral surface of the workpiece W that the knurled portion 31 of the first drive unit 30 bites in is in contact with the widening teeth 22 located on the rear end side of the knurled portion 31 and is plastically deformed. In this way, the bite mark by the knurled portion 31 is removed after the remaining widening step.

  Finally, in the finishing process of the rolling process, the workpiece W is separated from the second drive unit 40 past the widening teeth 22 and the end of the knurled portion 41. Then, the finishing teeth 23 formed in the outer peripheral shape corresponding to the target shape of the annular groove of the workpiece W come into contact so as to level the groove bottom surface and the groove side surface of the annular groove. Thereby, the annular groove is plastically deformed so as to be finished in a target shape. In addition, the outer peripheral surface portion (groove bottom surface) of the workpiece W that the knurled portion 41 of the second drive unit 40 has bitten contacts the finish teeth 23 located on the rear end side of the knurled portion 41 and is plastically deformed. Is done. In this way, the bite mark by the knurled portion 41 is removed by the finishing process.

(Effects of the configuration of the embodiment)
According to the rolling die 1 and the rolling method described above, the knurled portions 31 and 41 of the first drive unit 30 and the second drive unit 40 are configured to bite into the outer peripheral surface of the workpiece W that is not in contact with the rolling unit 20. did. Therefore, the workpiece W is rotationally driven in synchronization with the movement of the rolling die 1. Therefore, it is possible to prevent slippage between the workpiece W and the rolling die 1. Further, when the deformation resistance of the workpiece W increases, the pressure applied by the rolling die 1 also increases, and the knurled portions 31 and 41 bite into the outer peripheral surface of the workpiece W accordingly. Therefore, since the contact resistance between the workpiece W and the rolling die 1 can be increased even in a state where slippage is likely to occur, the occurrence of slipping can be reliably suppressed.

  Moreover, the 1st drive part 30 and the 2nd drive part 40 shall be provided along with the widening tooth | gear 22 of the rolling part 20, and the width direction. In the widening process of the rolling process, the deformation resistance of the workpiece W increases, so that slipping is particularly likely to occur. Therefore, by adopting such a configuration, the workpiece W can be rotationally driven in the widening step, so that the occurrence of slipping can be efficiently suppressed.

  The 1st drive part 30 and the 2nd drive part 40 shall be provided inside the width direction range R of the rolling part 20. As shown in FIG. Further, the second drive unit 40 is provided inside the recess 22 a of the widening tooth 22 in the rolling unit 20. Thereby, the workpiece W can be reliably rotated in the process of increasing the deformation resistance of the workpiece W in the rolling process. Further, the biting marks can be removed by the widening teeth 22 or the finishing teeth 23 located on the rear end side of the knurled portions 31 and 41. Therefore, the finished surface of the product by rolling can be improved.

  Furthermore, since the first drive unit 30 and the second drive unit 40 are detachably fixed to the base of the rolling die 1, only the first drive unit 30 and the second drive unit 40 can be exchanged. Become. Thereby, the installation of the 1st drive part 30 and the 2nd drive part 40 according to a use, such as changing the shape of the knurl parts 31 and 41 suitably, becomes possible. Further, in the rolling process, products are mass-produced by the same rolling die 1, so that the knurled parts 31, 41 of the first driving unit 30 and the second driving unit 40 are worn and the contact resistance is lowered. There is. Therefore, by exchanging only the first drive unit 30 and the second drive unit 40, it is possible to maintain a state in which the workpiece W is favorably rotated.

<Modification of Embodiment>
In this embodiment, the 1st drive part 30 and the 2nd drive part 40 shall have the knurled parts 31 and 41 as a processus | protrusion which bites into the outer peripheral surface of the workpiece W. FIG. This protrusion may be appropriately changed according to the hardness of the workpiece W to be contacted, or may be configured to arrange a twill knurling or a plurality of studs. Moreover, in this embodiment, the flat die was illustrated and demonstrated as a rolling die. On the other hand, you may apply to the roll-shaped die which makes the rolling die 1 develop | deployed shape. Even in such a configuration, the same effects as in the embodiment can be obtained.

  The rolling die 1 includes one first driving unit 30 outside the rolling unit 20, but may include a plurality of driving units on both sides of the rolling unit 20. Further, the drive unit may be provided side by side in the width direction of the introduction tooth 21 or the finish tooth 23. However, the aspect illustrated in the embodiment is suitable in consideration of the removal of biting marks and the like.

  Further, the widths of the first drive unit 30 and the second drive unit 40 are appropriately set. For example, the first drive unit 30 and the second drive unit 40 are set in consideration of the protrusion shape, the durability of the drive unit, the portion where slippage easily occurs, and the like. The Therefore, you may make it change gradually the width | variety and tooth height of a drive part in each process of a rolling process.

  In addition, the first drive unit 30 and the second drive unit 40 are fitted into the first mounting groove 11 and the second mounting groove 12 of the pedestal 10 and fixed with knock pins, respectively. On the other hand, it is good also as a structure supported so that a movement in a tooth height direction is possible with respect to the base 10 via an elastic member etc., for example. Thereby, the contact resistance with the workpiece W can be adjusted, and slippage in the rolling process can be prevented.

DESCRIPTION OF SYMBOLS 1: Rolling die | dye, 10: Base, 20: Rolling part, 21: Introducing tooth, 22: Widening tooth, 22a: Recessed part, 30: 1st drive part, 31: Knurled part (protrusion), 40: 2nd drive Part, 41: knurled part (protrusion), W: workpiece, L: groove width, D: groove depth, R: width direction range

Claims (6)

A rolling part that plastically deforms the outer peripheral surface of the workpiece by moving relative to the axial workpiece in the circumferential direction;
When the rolling unit plastically deforms the workpiece, a driving unit having a protrusion that bites into a portion of the outer peripheral surface of the workpiece that is not in contact with the rolling unit and rotates the workpiece.
Rolling dies equipped with. The rolling part has an introduction tooth that is a starting end for plastically deforming the workpiece, and a widening tooth that widens the axial width of the deformation part of the workpiece,
The rolling die according to claim 1, wherein the drive unit is provided side by side with the widened portion in the width direction.   The rolling die according to claim 1 or 2, wherein the driving unit is provided inside a range in the width direction in which the rolling unit is provided in the rolling die.   The rolling die according to any one of claims 1 to 3, wherein the driving unit is detachably fixed to a pedestal provided with the rolling unit. The rolling portion has a recess formed with a tooth height lower than both ends in the width direction so as to be non-contact with the workpiece at the center in the width direction when the workpiece is plastically deformed,
The rolling die according to any one of claims 1 to 4, wherein the driving unit is provided inside the concave portion of the rolling unit.   A pair of rolling dies arranged with an axial workpiece sandwiched therebetween are moved relative to each other in the circumferential direction, and the rolling portion of the rolling dies plastically deforms the outer peripheral surface of the workpiece, and the rolling dies A rolling method in which the protrusion of the driving portion provided on the workpiece bites into a portion of the outer peripheral surface of the workpiece that is not in contact with the rolling portion to rotate the workpiece.

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