JP3523673B2 - Rolling method and rolling device for shaft end - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling method and a rolling apparatus, and more particularly to centering one end of a shaft-shaped member by a concave center and performing rolling in a predetermined range including the one end. The present invention relates to a rolling processing method and a rolling processing device to be performed.

[0002]

2. Description of the Related Art A male screw, worm,
Rolling is widely used as a means for forming splines and serrations. FIG. 8 is a view for explaining an example of such a rolling process, in which a pair of convex centers 102 and 104 are engaged with center holes formed on both end surfaces of the shaft-shaped member 100 to perform centering and to rotate around the axis. A pair of rolling flat dies 106, which are rotatably supported and arranged with the shaft-shaped member 100 sandwiched therebetween, are pressed against the outer peripheral surface of the shaft-shaped member 100, and are synchronized in a direction perpendicular to the shaft center. By performing relative movement of the shaft member 100, a predetermined rolling process is performed while rotating the shaft member 100 around the axis.
The apparatus described in Japanese Utility Model Publication No. 2-4745 is an example of such a rolling apparatus.

By the way, in the case of supporting the shaft-shaped member by using the convex center as described above, it is necessary to pre-machine a center hole in the end face of the shaft-shaped member. It is not only tedious and time-consuming to process carefully, but it is also difficult to secure sufficient accuracy. For this reason,
For example, as shown in FIG. 9, it is considered that the end of the shaft-shaped member 110 is chamfered 112, and this is engaged with the concave center 114 for centering.

[0004]

However, when the shaft-shaped member is centered using the recessed center as described above, the end of the shaft-shaped member held by the recessed center is rolled. I can't do it. Therefore, when performing the rolling process on the end portion of the shaft-shaped member, the convex center is used for centering as shown in FIG. 8 or the cylindrical holding member 116 is used for shaft-forming as shown in FIG. Although there is no choice but to hold the non-rolled portion of the member 110 and perform the rolling processing in a cantilever state, when a convex center is used, the processing of the center hole is troublesome as described above, while using the holding member. When supporting in a cantilever state, the shaft-shaped member must be detachably held, so that sufficient centering accuracy cannot be obtained.

The present invention has been made in view of the above circumstances, and it is an object of the present invention that there is no need to perform a troublesome center hole drilling even when rolling the end portion of the shaft-shaped member. The purpose is to enable centering using a concave center.

[0006]

In order to achieve such an object, a first invention is to perform a rolling process by pressing a rolling flat die in a predetermined range including one end of a shaft-shaped member. A manufacturing method, comprising: (a) a centering step of centering the shaft-shaped member by engaging a concave center with a chamfer provided on an outer peripheral edge of one end of the shaft-shaped member; With the shaft-shaped member centered by the concave center, the biting side is provided at the tip side portion of the biting portion and the rear end side portion of the escape portion, which are located at one end side of the shaft-shaped member, respectively. A pair of rolled flat dies each having a notch and a relief-side notch are linearly moved in opposite directions with the shaft-shaped member sandwiched therebetween, and the tip side portion of the bite-side portion provided with the bite-side notch is pivoted. Biting step of biting in the vicinity of one end of the strip-shaped member, and (c) the pair After the rolled flat die bites the shaft-shaped member, a center retracting step of separating the recessed center from the shaft-shaped member; and (d) the recessed center separated from the shaft-shaped member, A rolling step of further linearly moving the pair of rolling flat dies to perform rolling processing within a predetermined range including the one end portion of the shaft-like member; and (e) the notch on the relief side of the pair of rolling flat dies. After the rear end side portion of the relief portion provided with substantially reaches the shaft-shaped member, there is a center advancing step of bringing the concave center close to the shaft-shaped member to support one end of the shaft-shaped member. It is characterized by

[0007]

In other words, the shaft-shaped member is centered during the rolling process when the biting portion of the rolling flat die bites the outer peripheral surface of the shaft-shaped member to plastically deform in the initial stage of rolling. This is to prevent the axial member from being displaced due to deformation resistance.
Once the rolling flat die has cut into the outer peripheral surface of the shaft-shaped member, the movement of the shaft-shaped member is restricted by the rolling flat die, so there is no risk that the shaft-shaped member will be displaced during the subsequent rolling process. There are few, and it is not always necessary to center them. The present invention has been made based on such knowledge, and until the biting portions of the pair of rolled flat dies bite the shaft-shaped member, the chamfered concave end formed on one end of the shaft-shaped member has a concave center. Are engaged and centered to prevent the shaft-like member from being displaced due to deformation resistance when biting. In this case, a cutout side cutout is provided at the tip end side portion of the biting part of the pair of rolling flat dies, which is located on the one end side of the shaft-shaped member, and the concave center and the rolling flat die are separated from each other. Make sure that they do not interfere with each other, and let the rolled flat die bite a little inside from the one end supported by the concave center.

After that, the concave center is separated from the shaft-like member to release the centering of one end, and in that state, the pair of rolled flat dies are further linearly moved to a predetermined position including one end of the shaft-like member. Roll to the range. The one end held by the concave center, that is, the part where the cutout side notch has been formed and the rolling flat die has not bite yet, the rolling flat die will bite for the first time at this stage. Since the rolling flat die has already cut into the inner part and regulates the movement of the shaft-shaped member, the shaft-shaped member is misaligned and rolled due to the deformation resistance of the newly started rolling part. It does not cause manufacturing defects. In addition, since the centering by the concave center is released after the rolling flat die bites the shaft-shaped member, even if the concave center is non-rotatably arranged so that higher centering accuracy can be obtained. Wear of the concave center due to relative rotation with the cylindrical member is small, and an excellent center life can be obtained.

On the other hand, when the rolling process by the pair of rolling flat dies reaches near the end, in order to prevent the shaft-like member from falling off from the rolling flat dies, the concave center is formed in the axial shape. The member is approached and one end thereof is supported again. In that case, a relief side notch is provided in the rear end side portion of the pair of rolling flat dies, which is located on the one end side of the shaft-shaped member, so that the concave center and the rolling flat die interfere with each other. Try not to.

[0010]

As described above, according to the first aspect of the invention, since the shaft-shaped member can be centered by the concave center and the end portion of the shaft-shaped member can be rolled, the convex center can be formed. It is not necessary to perform the center hole machining that is more troublesome than the case of using the centering, and the machining accuracy is higher than when performing the rolling process in a cantilever state while holding the intermediate part of the shaft-shaped member. can get. Further, after the rolled flat die bites the shaft-shaped member, the centering by the recessed center is released, so even if the recessed center is arranged so as not to rotate, wear due to relative rotation with the shaft-shaped member is small, Excellent center life is obtained.

[0011]

A second aspect of the present invention relates to a rolling processing apparatus capable of suitably carrying out the rolling processing method of the above-mentioned first invention, in a predetermined range including one end of a shaft-shaped member. A rolling processing device for pressing a rolling flat die to perform rolling processing, comprising: (a) a front end side portion of a chamfered portion and a rear end side portion of a relief portion, which is one end side of the shaft-shaped member. A pair of rolled flat dies each having a cutout side cutout and a relief side cutout at a portion located at, and (b) the pair of rolled flat dies are linearly moved in mutually opposite directions with the shaft member interposed therebetween. And (c) a concave center for centering the shaft-shaped member by engaging with a chamfer provided on the outer peripheral edge of one end of the shaft-shaped member, and (c) the dice moving device When the pair of rolled flat dies are linearly moved, the cutout side notch is The concave center is held at the centering position for engaging the shaft-shaped member until the biting position where the tip end side portion of the scraped bite bites near the one end of the shaft-shaped member. When the position exceeds the attached position, the concave center is separated from the shaft-like member, and after the rear end side portion of the escape portion provided with the escape-side notch substantially reaches the shaft-like member, the concave center is moved to the core. Center moving means for moving one end of the shaft-shaped member by moving the shaft-shaped member to the extended position.

[0012]

In the rolling device for such a shaft end,
By holding the concave center at the centering position by the center moving means and engaging it with a chamfer provided at one end of the shaft-shaped member, the shaft-shaped member is centered, and in that state, the pair of rolling members is rotated by the die moving means. The flat forming dies are linearly moved in mutually opposite directions to start the rolling process. Then, when the tip side portion of the biting portion provided with the biting side cutout exceeds the biting position where it bites in the vicinity of one end of the shaft-shaped member, the concave center is separated from the shaft-shaped member by the center moving means. Then, the centering of one end is released, and in that state, the pair of rolling flat dies is linearly moved by the die moving means to perform the rolling process in a predetermined range including one end of the shaft-shaped member. Further, after the rear end side portion of the escape portion provided with the escape side cutout has almost reached the shaft-shaped member, the concave center is again moved to the centering position by the center moving means to move one end of the shaft-shaped member. Support.

[0013]

In the present invention as well, since the shaft-shaped member can be centered by the recessed center and the end portion of the shaft-shaped member can be rolled, the shaft-shaped member can be rolled as in the first invention. It is possible to easily roll the end portion with high accuracy. Further, since the centering by the recessed center is released after the rolled flat die bites the shaft-shaped member, it is excellent even when the recessed center is non-rotatably arranged in order to obtain higher centering accuracy. The fact that the center life is obtained is the same as in the first aspect of the invention.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a rolling processing apparatus 10 capable of suitably implementing the rolling processing method of the first invention,
The rolling device 10 constitutes an embodiment of the second invention. The rolling processing apparatus 10 includes a pair of rolling flat dies 12 and 14 arranged to face each other, and a synchronization mechanism 16 for synchronously moving the rolling flat dies 12 and 14 relative to each other in the vertical direction. , A die moving device 18 for reciprocating one of the rolling flat dies 12 in the vertical direction, and the shaft-shaped member 20 to be rolled is the rolling flat dies 12 and 1
4 and 4 are at a right angle to their moving direction and the rolled surface 1
It is arranged to be rotatable about an axis parallel to 2a and 14a, that is, perpendicular to the paper surface of FIG. As shown in FIG. 2, the shaft-shaped member 20 has a small diameter portion 22 at one end, and in this embodiment, a case where a male screw is rolled on the small diameter portion 22 will be described. The outer peripheral edge of the tip end of the small diameter portion 22 is chamfered 24 so as to be centered by a concave center 28 in which a center hole 26 is formed, and the other end of the shaft-shaped member 20 is Although not shown, the outer peripheral edge is also chamfered and centered by the concave center. In addition, this shaft-shaped member 2
Regarding the other end portion of 0, it is possible to form a center hole in the end surface and center it by a convex center, and when the shaft-shaped member 20 is long, the intermediate portion is held as necessary. It may be rotatably held by a member 116 or the like.

The pair of rolling flat dies 12 and 14 have exactly the same structure, and as shown in FIG.
A large number of ridges having a shape corresponding to the thread groove of the male screw to be formed are provided on a and 14a. In addition, these rolled flat dies 12, 14 are provided with the bite portion 30, the parallel thread portion 3
2, the relief portion 34 is provided, and the bite portion 30 and the relief portion 34 are respectively provided with notches 36 at the end portions thereof located on the tip side of the small diameter portion 22 of the shaft-shaped member 20.
38 are provided. The cutout 36 provided in the bite part 30 corresponds to the bite side cutout, and the cutout 38 provided in the escape part 34 corresponds to the escape side cutout. The synchronization mechanism 16
Is provided with, for example, a pair of racks integrally provided on the rolling flat dies 12 and 14 and a pinion that meshes with the pair of racks. Both rolling flat dies 12 and 14 are moved in opposite directions at the same speed. It is configured to move relative to each other.
The pair of rolling flat dies 12 and 14 are arranged so as to be movable in the vertical direction via guide means such as guide rails (not shown). The die moving device 18 constitutes a die moving means together with the synchronizing mechanism 16, and includes a screw shaft which is rotationally driven by an electric motor such as a servomotor, and a screw shaft which is screwed onto the screw shaft and rolled. The die 12 is provided with a nut member disposed integrally with the die 12, and is configured to reciprocate the rolled flat die 12 in the vertical direction by rotationally driving the screw shaft.

The concave center 28 has a center moving device 40.
The reciprocal movement is made in the axial direction, that is, in the direction perpendicular to the paper surface of FIG. The center moving device 40 is configured, for example, as shown in FIG. 4, and is provided with a slide member 42 arranged by a guide rail or the like (not shown) so as to be movable in the left-right direction of FIG. And a holder 44 that detachably holds the concave center 28. Slide member 4
When the screw shaft 48 is rotationally driven by an electric motor 46 such as a servo motor, the screw 2 is reciprocally moved in the left-right direction in FIG. 28 is positioned at a leftward forward position where it engages with the shaft-like member 20 and a rightward retracted position where engagement between the concave center 28 and the shaft-like member 20 is released. Further, the holder 44 is disposed on the slide member 42 by the guide means 52 such as a guide rail so as to be movable in the left-right direction in FIG. 4, and is urged to the left by a spring member 54 such as a compression coil spring. It is always held at the front end position where it abuts against the stopper 56, and when the slide member 42 is moved to the forward position and the concave center 28 is engaged with the shaft member 20, the spring force of the spring member 54 is resisted. And is retracted from the front end position, and the spring force of the spring member 54 causes the concave center 2 to move.
8 is adapted to be engaged with the shaft-shaped member 20.
The position of the concave center 28 at this time is the centering position. Instead of using the electric motor 46, the screw shaft 48, or the like, other center moving means using an air cylinder or the like can be adopted, and the holder 44 can be arranged on the slide member 42 so as not to be movable relative to each other. Is.

Returning to FIG. 1, the die moving device 18 and the center moving device 40 are controlled by a controller 60. The controller 60 is C
A microcomputer having a PU, a RAM, a ROM, etc., which uses the temporary storage function of the RAM and performs signal processing according to a predetermined program in the ROM, is configured to perform the signal processing according to a flowchart shown in FIG. 5, for example. To do. The controller 60 is supplied with at least a signal representing the amount of movement Xd of the rolled flat die 12 from the original position from the die moving device 18.

In FIG. 5, in step S1, the slide member 42 of the center moving device 40 is advanced to the forward position, and the concave center 28 is pressed against the small diameter portion 22 of the shaft-shaped member 20 previously supplied by the automatic supply device or the like. , The shaft-shaped member 20 is centered. This step S1 is a centering step, and FIG. 6A shows a state of being centered in the centering step. In step S2, the rolling flat die 12 is moved upward from the original position by the die moving device 18, and the other flat rolling die 14 is moved downward accordingly. As a result, the rolled flat die 1 is attached to the small diameter portion 22 of the shaft-shaped member 20.
The rolling-processed surfaces 12a and 14a of 2, 14 are pressed, and the outer peripheral surface of the small-diameter portion 22 is rolled while rotating the shaft member 20 around the axis. FIG. 6 is a diagram showing a change in the relative position between the one rolling flat die 12 and the shaft-shaped member 20, and FIGS. 6 (a) to (b), (c), and (d) and the shaft-shaped member 20.
Is moving downward, but actually, the rolled flat die 12 is moved upward with respect to the shaft-shaped member 20. And
In step S3, it is determined whether or not the movement amount Xd of the rolled flat die 12 from the original position exceeds a preset first determination value α, and when it exceeds the first determination value α, the center movement is performed in step S4. The slide member 42 of the device 40 is retracted to the retracted position, and the concave center 28 and the small diameter portion 2 of the shaft-shaped member 20 are moved.
The engagement with 2 is released.

The first judgment value α is the rolling flat die 12,
14 is a biting position where the tip end side portion of the biting portion 30 bites substantially the entire circumference of the small diameter portion 22, and in this embodiment, the pair of rolling flat dies 12 and 14 sandwich the small diameter portion 22 from both sides to perform rolling processing. Since the rolling flat dies 12 and 14 are engaged with the shaft-shaped member 20 to reach a position where they are rotated by more than half a rotation, the rolling flat dies 12 reach a position where they are rotated by more than half a rotation. Since the movement of the shaft-shaped member 20 is restricted by the flat dies 12 and 14 biting into the outer peripheral surface, even if the centering by the concave center 28 is released, the shaft-shaped member 20 may be displaced in the subsequent rolling process. There is almost no. That is, when the biting part 30 of the rolling flat dies 12 and 14 bites on the outer peripheral surface of the small diameter part 22 and plastically deforms at the initial stage of rolling, the shaft-shaped member 20 may be displaced due to the deformation resistance. At the initial stage of biting, it is necessary to perform the rolling process by centering the small diameter portion 22 by the concave center 28, but once the rolling flat dies 12 and 14 bite into the outer peripheral surface of the small diameter portion 22, There is almost no possibility that the shaft-shaped member 22 will be displaced during the subsequent rolling process, and it is not always necessary to center it. The notch 36 is provided so that the concave center 28 and the rolled flat dies 12 and 14 do not interfere with each other until the concave center 28 is retracted in step S4. The rolling process is not performed on the tip portion of the small diameter portion 22 held by, and the biting portion 30 bites only on the inner side portion. Steps S2 and S3, that is, (a) of FIG.
The process in which the shaft-shaped member 20 relatively moves from (b) to (b) is a biting process, and the process in step S4, that is, (b) in FIG. 6 is a center retracting process.

After the recessed center 28 is retracted in step S4, when the rolling flat dies 12, 14 are further moved, the notch 36 disappears so that the rolling work is performed up to the tip of the small diameter portion 22. become. At this stage, the rolling flat dies 12, 14 bite into the tip portion of the small-diameter portion 22 for the first time, but the rolling flat dies 12 and 14 have already bitten into the inner portion of the shaft-shaped member 20. Since the movement of the shaft-shaped member 20 is restricted, the shaft-shaped member 20 is not displaced due to the deformation resistance of the portion where the rolling process is newly started, and the rolling defect does not occur. Further, since the centering by the concave center 28 is released, the wear of the center hole 26 due to the relative rotation with the shaft-shaped member 20 is reduced, and the life is improved.

Then, in the next step S5, it is determined whether or not the movement amount Xd of the flat rolling die 12 from the original position exceeds a preset second determination value β, and the second determination value β is exceeded. Then, in step S6, the slide member 42 of the center moving device 40 is advanced to the advance position, and the concave center 28
Is pressed against the small-diameter portion 22 of the shaft-shaped member 20 to perform centering again. As shown in (c) of FIG. 6, the second determination value β is set such that the relief portion 34 of the rolled flat die 12 has substantially the same height as the shaft-shaped member 20, specifically, the concave center 28 is advanced. Notch 3
8 is a value that reaches a height where it does not interfere with the rolling flat dies 12 and 14, and the tip of the small diameter portion 22 is held again by the concave center 28 in this way, so that the small diameter portion 22 is rolled. The shaft-shaped member 20 is prevented from falling after being separated from the shafts 12, 14. The step of moving the rolling flat dies 12 and 14 to perform the rolling process until the determination in step S5 becomes YES, that is, the shaft-like member 20 relatively moves from (b) to (c) of FIG. The process is a rolling process, and step S6, that is, the process of FIG. 6C is a center advance process.

In step S7, it is determined whether or not the movement amount Xd of the flat rolling die 12 from the original position exceeds a preset third determination value γ, and if it exceeds the third determination value γ, step S8 At, the movement of the rolled flat die 12 by the die moving device 18 is stopped. The third determination value γ is a value at which the rolled flat die 12 reaches above the shaft-shaped member 20 as shown in FIG.
The rolling process for 2 is completed. In the next step S9, the slide member 42 of the center moving device 40 is retracted to the retracted position to release the engagement between the concave center 28 and the small-diameter portion 22 of the shaft-shaped member 20, and a shaft-shaped device such as a discharging device (not shown) is used. The member 20 is discharged, or dropped by its own weight and discharged by a shooter or the like. Further, in step S10, the die moving device 18 lowers the rolled flat die 12 to the original position, and the other rolled flat die 14 is also raised to the original position accordingly. As a result, a series of rolling processes for one shaft-shaped member 20 is completed.

Here, the rolling processing apparatus 10 of the present embodiment is
Since the small-diameter portion 22 of the shaft-shaped member 20 can be centered by the concave center 28 and the small-diameter portion 22 can be rolled, a center hole that is more cumbersome than the centering using the convex center. The shaft-shaped member 22 is not required to be processed.
Higher processing accuracy can be obtained as compared with the case of performing the rolling processing in a cantilever state while holding the intermediate portion of the. Further, in this embodiment, since the concave center 28 is arranged so as not to rotate, higher centering accuracy can be obtained, while the rolled flat dies 12, 14 are provided.
After biting into the small-diameter portion 22, the centering by the concave center 28 is released, so that wear of the center hole 26 due to relative rotation with the shaft-shaped member 20 is reduced, and an excellent center life is obtained. Further, in the present embodiment, the relief portion 34 has the shaft-shaped member 22.
When it reaches, the small-diameter portion 22 is centered and held again by the concave center 28.
Of the shaft-shaped member 2 after it has been separated from the rolling flat dies 12 and 14
Zero drops are prevented.

In this embodiment, steps S3, S4, S5 and S of the series of signal processing by the controller 60 are performed.
The part that executes 6 constitutes the center moving means of the second invention together with the center moving device 40.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, in the above-described embodiment, the notches 36 and 38 are provided substantially at right angles to the die moving direction, but like the rolled flat die 64 shown in FIG. 7, the notch 66 is inclined with respect to the die moving direction. , 68 can be provided as a cutout side cutout and a relief side cutout, respectively, in which case a rapid change in rolling resistance is reduced. It is also possible to provide an inclined portion continuously with the notches 36 and 38.

Further, in the above embodiment, the rolled flat die 12,
The recessed center 28 may be moved backward (step S4) or moved forward (step S6) without stopping the movement of 14
However, it is also possible to temporarily stop the movement of the rolling flat dies 12 and 14 and move the concave center 28 backward and forward.

Further, in the above-mentioned embodiment, the concave center 28 is moved backward and forward based on the movement amount Xd from the original position, but the concave center is numerically controlled according to the movement amount of the rolling flat die 12. 28 may be moved, or the position of the rolling flat die 12 or 14 may be detected by a position sensor such as a limit switch to move the concave center 28. When the notches 66 and 68 are inclined like the rolling flat die 64 of FIG. 7, the notches 66 and 6 are
The slide member 42 may be mechanically retracted and moved forward through an engaging roller that engages with 8. A cam member may be provided on the slide member 42 or the rolling flat die, and the slide member 42 may be moved backward and forward at a predetermined position via the cam member as the rolling flat die moves.

Further, in the above-mentioned embodiment, the die moving means is constituted by the synchronizing mechanism 16 and the die moving device 18, but both the rolled flat dies 12, 14 are relatively moved at the same speed in the opposite directions by the screw shafts or the like. You can choose to let them do it.

Further, the center moving device 40 of the above-mentioned embodiment is designed to hold the concave center 28 so as not to be rotatable about its axis, but the holder for holding the concave center 28 is arranged to be rotatable about its axis. The recessed center 28 is provided in the shaft-shaped member 2
It can also be made to rotate with 0.

Further, in the above-described embodiment, the case where the left-handed male screw is rolled is described as apparent from FIG. 6, but when the right-handed male screw is rolled, the worm, spline, serration, etc. The present invention can be similarly applied to the case where another rolling process is performed on the shaft end portion.

Although not illustrated one by one, the present invention can be carried out in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration of a rolling processing apparatus which is an embodiment of a second invention capable of suitably implementing the rolling processing method of the first invention.

FIG. 2 is a view showing one end portion of a shaft-shaped member which is rolled by the rolling device of FIG. 1 together with a concave center.

FIG. 3 is a diagram showing a rolling flat die in the rolling processing apparatus of FIG.

FIG. 4 is a diagram showing a schematic configuration of a center moving device in the rolling processing device of FIG. 1.

FIG. 5 is a flowchart illustrating an operation of the rolling processing apparatus of FIG.

FIG. 6 is a diagram for explaining a mutual positional change of the shaft-shaped member, the rolling flat die, and the concave center when the rolling process is performed according to the flowchart of FIG.

FIG. 7 is a diagram showing another aspect of the rolled flat die used in the rolling apparatus of FIG.

FIG. 8 is a diagram illustrating an example of a conventional rolling processing apparatus.

FIG. 9 is a diagram showing a state in which a shaft-shaped member is centered using a concave center.

FIG. 10 is a diagram showing a state in which a middle portion of a shaft-shaped member is held by a holding member.

[Explanation of symbols]

10: Rolling machine 12, 14, 64: Rolled flat die 16: Synchronizing mechanism (die moving means) 18: Die moving device (die moving means) 20: Shaft member 24: Chamfer 28: concave center 30: Half-board 36, 66: Cutout (cutout on the side with bite) 38, 68: Notch (Escape side notch) 40: Center moving device (center moving means) Steps S3 to S6: Center moving means Step S1: Centering process Steps S2 and S3: Process with eating Step S4: Center evacuation process Step S5: Rolling process Step S6: Center advance process

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Claims (2)

(57) [Claims] 1. A rolling processing method for pressing a rolling flat die within a predetermined range including one end of the shaft-shaped member to perform the rolling process, which is performed on an outer peripheral edge of one end of the shaft-shaped member. Centering step of engaging the recessed center with the chamfer to center the shaft-shaped member; and in a state where the shaft-shaped member is centered by the recessed center, A pair of rolled flat dies, each having a recessed side cutout and a relief side cutout, are provided in the rear end side portion located on one end side of the shaft-shaped member, and are opposite to each other with the shaft-shaped member interposed therebetween. Linearly moving in the direction, and the biting step of biting the tip side part of the biting part provided with the biting side notch in the vicinity of one end of the shaft-like member, and the pair of rolling flat dies. After biting into the shaft member, the concave center is separated from the shaft member. Center retreating step, and in a state where the concave center is separated from the shaft-shaped member, the pair of rolling flat dies are further linearly moved to perform a rolling process in a predetermined range including the one end of the shaft-shaped member. The rolling step to be performed, and after the rear end side portion of the escape portion provided with the escape side notch of the pair of rolling flat dies substantially reaches the shaft-shaped member, the concave center is brought close to the shaft-shaped member. And a center advancing step for supporting one end of the shaft-shaped member. 2. A rolling processing apparatus for pressing a rolling flat die in a predetermined range including one end portion of a shaft-shaped member to perform rolling processing, wherein a leading end side portion of a chamfered portion and a rear end of a relief portion. A pair of rolling flat dies each having a bite side cutout and a relief side cutout in a side portion located on one end side of the shaft-like member, and the pair of rolling flat dies having the axial shape. A die moving means for linearly moving the members in opposite directions, a concave center for engaging the chamfer provided on the outer peripheral edge of one end of the shaft member to center the shaft member, When the pair of rolling flat dies is linearly moved by the moving means, the tip end side portion of the bite side portion provided with the bite side cutout bites near the one end of the shaft-like member. Up to the centering position where the concave center is engaged with the shaft member. Although it is held, the concave center is separated from the shaft-like member when the bite position is exceeded, and after the rear end side portion of the escape portion provided with the escape-side cutout substantially reaches the shaft-like member. And a center moving means for moving the concave center to the centering position to support one end of the shaft-shaped member.