JPH07112230A - Device and method for form rolling working - Google Patents

Abstract

PURPOSE:To attain a method of a form rolling working by which engaging accuracy can be enhanced by pushing the abutting surface of the pressure member of a base stock on a base stock, which is formed on a line in which the lead angles of a shaft-shaped base stock and a form rolling die are equal by a form rolling die side part just before the completion of form rolling. CONSTITUTION:A work 10 is inserted to a guide cylinder 5, and is restrained by a screw 11c for adjusting a pressurizing force to hold it. After that, a base part is pressurized by a pair of form rolling dies 12 while they are rotating to form a worm part 20a and just before the completion of form rolling, the abutting surfaces 14a and 15a of the pressure members 14 and 15 of respective base stocks arranged on the side part of the form rolling die 12 are pushed respectively on supporting parts 10c and 10d. Since the form rolling die 12 and the work 10 continue to rotate, inside diameter dimensions D7 and D8 formed by respective abutting surfaces 14a and 15a are made equal to inside diameter dimensions formed by virtual lines on which the lead angles of the form rolling die 12 and the work 10 are equal. Consequently, the form rolling of the shaft-shaped base stock is performed without a flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling apparatus and a rolling method used for forming a worm or a male screw while rotating a shaft-shaped material between rolling dies.

[0002]

2. Description of the Related Art Conventionally, as a rolling processing apparatus for forming a worm or a male screw while rotating a shaft-shaped material between rolling dies, one described in Japanese Patent Publication No. 3-38011 is known. As those in which plain dies are provided on both sides of the rolling die, those shown in FIGS. 4, 5 and 6 are known.

The rolling processing apparatus shown in FIG. 4 has a rolling die 40.
First for the workpiece 50 that is a shaft-shaped material on one side of
One of the plane dies 41 having a contact diameter D1 of 1 is provided, and the work 50 is provided on the other side of the rolling die 40.
The other plane die 42 having the outer diameter D2 is provided.

The work 50 rolls in a state in which it is in contact with one of the plane dies 41 on the tip side of the worm forming part 50a and on the other side of the plane die 42 on the base end side of the worm forming part 50a just before the completion of rolling. Since the structure is finished, both plane dies 4 provided on the sides of the rolling die 40 respectively.
A worm shaft 50c having a worm portion 50a whose bending in the lengthwise direction is suppressed by 1, 42 is formed.

[0005]

In the above-mentioned conventional rolling apparatus, one plane die having the first contact inner diameter D1 on the tip side of the worm forming portion 50a of the work 50 in order to suppress the bending in the length direction. 41, and the other plane die 42 having the outer diameter D2 of the work 50 is brought into contact with the base end side of the worm molding portion 50a. As is clear from FIG. 5, the work 50 and the rolling die 40 are , The lead angle of the workpiece 50 on which the tooth top 50b and the tooth bottom 50c are formed and the lead angle of the rolling die 40 having the tooth top 40a and the tooth bottom 40b are equal to each other and rotate on the line D0. , A first contact diameter D1 of one plane die 41 or a second contact diameter of the other plane die 42 with respect to a diameter dimension D01 formed by the line D0 having the same advance angle. Deviation of diameter D2 is set to a large value. Here, a large frictional force acts on the contact surface Z between the die 40 and the work 50 during rolling, and the portion M where the frictional force is balanced is generally the lead angle of the rolling die 40 and the work 50. Is closer to the work 50 side than the line D0 having the same lead angle. As is clear from FIG. 6, if the relative rotational motion of the rolling die 40 and the workpiece 50 is a, the movement of the workpiece 50 with respect to the rolling die 40 is in the direction of Xa, and thus the downward movement in the figure. When the lead angle of the rolling die 40 that rotates toward the direction causes the workpiece 50 to flow in the direction of Ya, and the relative rotational motion is at an impact b, the movement of the workpiece 50 with respect to the rolling die 40 is in the direction of Xb. Therefore, the workpiece 50 causes a flow in the direction of Yb due to the lead angle of the rolling die 40 that rotates downward in the figure, and the deviation is different from the worm tooth profile which is being completed just before the completion of rolling. The flow causes the friction force to become unbalanced, and the flow may increase the lead staggering that hinders the meshing accuracy. Been worm shaft 60 has a problem that it is difficult to obtain a smooth engagement, it has been a problem to solve the above problems.

[0006]

An object of the present invention is to provide a rolling apparatus and a rolling method capable of improving the meshing accuracy by making the outer peripheral runout amount and the random walk amount extremely small. Is intended to provide.

[0007]

[Constitution of the invention]

[0008]

According to a first aspect of the present invention, there is provided a rolling apparatus according to a first aspect of the present invention, in which a pair of rolling dies form a metallic cylindrical shaft portion, and a cylindrical shape connected to the shaft portion. A rolling processing device for forming a worm portion on a shaft-shaped material having a rolling base part of, wherein the shaft-shaped material has an outer diameter different from that of the shaft part at least between the shaft part and the rolling base part. A pair of rolling dies having a columnar supporting portion, and a material pressing member having an abutting surface facing the supporting portions is provided on a side portion of the pair of rolling dies. Immediately before, the contact surface is arranged on an imaginary line connecting the positions where the lead angle of the worm formed on the shaft-shaped material and the lead angle of the rolling die are equal to each other. , Claim 2 of the present invention
In the rolling processing apparatus according to 1, the material pressing member forms an abutting surface that presses against a single supporting portion formed between the shaft portion of the shaft-shaped material and the rolling base portion. In the rolling processing apparatus according to claim 3 of the present invention, the material pressing member is formed with contact surfaces that are pressed against the supporting portions formed on both sides of the rolling base portion of the shaft-shaped material. The rolling apparatus according to claim 4 of the present invention has a metal-made cylindrical shaft portion and a cylindrical rolling base portion connected to the shaft portion by a pair of rolling dies. A method for forming a worm part on a shaft-shaped material, which comprises a shaft-shaped material having at least a shaft-shaped material and a columnar support part having an outer diameter different from that of the shaft part between the shaft part and the rolling base part. Use the side of the pair of rolling dies to the supporting part A material pressing member having a facing contact surface is arranged, and on the imaginary line connecting the positions where the lead angle of the worm part formed on the shaft-shaped material and the lead angle of the rolling die are equal to each other immediately before the end of rolling. The contact surface of the material pressing member is pressed against the supporting portion. The rolling apparatus according to claim 5 of the present invention is a shaft in which a single supporting portion is formed between the shaft portion and the base portion. It is assumed that a strip-shaped material is used, and the rolling apparatus according to claim 6 of the present invention uses a shaft-shaped material having support portions formed on both sides of the base portion.

[0009]

In the rolling apparatus and rolling method according to the present invention, the shaft-shaped material is pressed against the contact surface of the material pressing member immediately before the completion of rolling. Since this contact surface is disposed on the side of the rolling die on a virtual line connecting the positions where the lead angle of the shaft-shaped material and the lead angle of the rolling die are equal to each other, the rolling die and the shaft-shaped material are The area where the frictional force generated when and are contacted is arranged on the imaginary line connecting the positions where the lead angle of the rolling die and the lead angle of the work are equal to each other, so the axial material is rolled without flow. Will be done.

[0010]

1 to 3 show an embodiment of a rolling apparatus and a rolling method according to the present invention.
FIG. 1 is a horizontal sectional view of a main part, FIG. 2 is a side view of a shaft-shaped material, and FIG.
FIG. 4 is a horizontal sectional view around a rolling die and a shaft-shaped material.

In the illustrated rolling apparatus 1, outer rings 3a and 4a of bearings 3 and 4 are attached to both ends of a shaft holding member 2 having a guide tube fitting hole 2a formed in a round hole shape. The inner rings 3 b, 4 b of the bearings 3, 4 are attached to the guide cylinder 5. The guide tube 5 is mounted on the shaft holding member 2 by bearings 3 and 4.
It is rotatably held inside the.

A flywheel 6 is arranged on one side of the guide cylinder 5, and a spring plunger 11 for constantly pressing the outer peripheral surface 10a of the work 10 inserted in the inner periphery of the guide cylinder 5 is built in the flywheel 6. Has been done.

In the spring plunger 11, the ball 11a and the return spring 11b are sequentially inserted into the screw holes 6a and 5a formed in the flywheel 6 and the guide tube 5, and then the screw 11c for adjusting the pressing force is screwed into the screw holes 6a and 5a. The work 10 inserted into the inner peripheral side of the guide cylinder 5 by going out
It has a function of pressing the outer peripheral part of the work piece 10 with the ball 11a to lock the work 10 to the guide cylinder 5.

Then, the rolling dies 12, 12 are arranged at a predetermined distance from the other side of the guide cylinder 5, and the workpiece 10 which is the shaft-shaped material locked in the guide cylinder 5 is held. The rolling dies 12, 12 are arranged on the protruding portion from the other side.

The rolling dies 12, 12 are a pair of round dies, and the first material pressing members 14, 14 are provided on the left side in FIG. 2, which is one side of the rolling dies 12, 12. 2 is provided on the other side of the rolling dies 12, 12.
Second material pressing members 15, 15 are arranged on the right side in the inside. Rolling dies 12, 12, 14, 14, 15,
15 may be a flat die.

The work 10 is as shown in FIG.
A base portion 10b for forming the worm portion 20a is provided on one side of the shaft portion 10a. In this case, the outer diameter dimension D3 of the base portion 10b is smaller than the outer diameter dimension D4 of the shaft portion 10a. The outer diameter dimension D3 of the base portion 10b may be the same as the outer diameter dimension D4 of the shaft portion 10a.

A first support portion 10c, which is one of the support portions, is provided between the base portion 10b and the shaft portion 10a, and the outer diameter dimension D5 of the first support portion 10c is the same as that of the shaft portion 10a. The outer diameter D4 is formed differently. Although the outer diameter is shown differently for convenience of description, it may be the same as the outer diameter D3 of the base portion 10b in practice.

A second supporting portion 10d, which is the other supporting portion, is provided on the opposite side of the first supporting portion 10c via the base portion 10b, and the second supporting portion 10d is provided outside the second supporting portion 10d. The diameter D6 is formed to be different from the outer diameter D4 of the shaft portion 10a. Although the outer diameter is shown differently here for convenience of explanation, the base portion 10 is practically used.
The outer diameter dimension D3 of b may be the same. The second support portion 10d is provided as needed.

On the other hand, on the work 10 side of the first material pressing members 14 and 14 disposed on one side of the rolling dies 12 and 12, a first flat member is formed.
Abutting surfaces 14a, 14a are respectively provided, and the inner diameter dimension D7 formed by the first abutting surfaces 14a, 14a.
Is equal to the inner diameter dimension D01 (see FIG. 5) formed by the line D0 (see FIG. 5) where the lead angle of the work 10 and the lead angles of the rolling dies 12, 12 are equal. The first contact surfaces 14a, 14a of the first material pressing members 14, 14 are pressed against the first support portion 10c immediately before the end of rolling.

Further, in the same manner as the first material pressing members 14 and 14, the second material pressing members 15 and 15 disposed on the other side portions of the rolling dies 12 and 12 are provided on the work 10 side. Second abutment surfaces 15a, 15a having a flat shape, respectively. The outer diameter dimension D8 formed by the second abutment surfaces 15a, 15a is determined by the advance angle of the work 10 and the rolling dies 12, 12. Diameter dimension D01 (see FIG. 5) formed by a line D0 (see FIG. 5) whose lead angle is equal to.
Is equal to. The second contact surfaces 15a and 15a of the second material pressing members 15 and 15 are provided on the second support portion 1 immediately before the completion of rolling.
It is pressed against 0d. Second material pressing member 15, 15
Need not be provided in the case where the work 10 not provided with the second supporting portion 10d is rolled. , Where the first
Abutting surfaces 14a, 14a of the raw material pressing members 14, 14 and abutting surfaces 15a, 15 of the second raw material pressing members 15, 15
Since the outer diameter dimensions D7 and D8 formed by a are equal to the diameter dimension D01 formed by the line D0 at which the lead angle of the work 10 and the lead angle of the rolling dies 12, 12 are equal. The position M (see FIG. 6) where the frictional forces are balanced when the rolling dies 12, 12 and the work 10 are in contact with each other is not close to the work 10 side. Second contact surfaces 14a, 15
The frictional force of “a” is the lead angle of the work 10 and the rolling dies 12, 1
It is encouraged to be formed by the line D0 where the lead angle of 2 is equal.

When the worm shaft 20 is produced by using the rolling processing apparatus 1 having such a structure, the work 10 is inserted into the guide cylinder 5 from the left side in FIG. 1 and the screw for adjusting the pressing force is inserted. By screwing 11c into the screw holes 6a and 5a, the work 10 is locked and held by the guide cylinder 5, and then one side of the work 10 is projected from the guide cylinder 5. After that, the pair of rolling dies 12, 12 that had been separated from the work 10 approached the work 10 while rotating,
From both sides of the work 10, the rolling dies 12, 12 come into contact with and are pressed by the base portion 10a while rotating for a predetermined time.

The rolling dies 12, 12 come into contact with and press the base portion 10b, so that the worm portion 2 is attached to the base portion 10a.
Mold 0a.

At this time, when the rolling dies 12, 12 and the work 10 have finished their predetermined rotations, that is, immediately before the completion of rolling, the first dies placed on the side portions of the rolling dies 12, 12 are rotated. 1 material pressing member 14, abutting surface 14 of 14
a, 14a are pressed against the first support portion 10c,
The contact surfaces 15a, 15a of the material pressing members 15, 15 are pressed against the second support portion 10d.

Abutting surfaces 14a, 14a of the first material pressing members 14, 14 arranged on the sides of the rolling dies 12, 12.
Is pressed against the first supporting portion 10c, and the contact surfaces 15a, 15a of the second material pressing members 15, 15 are pressed against the second supporting portion 10d. And the abutting surfaces 14a of the first material pressing members 14 and 14 in the finish of rolling,
14a and the contact surface 1 of the second material pressing members 15 and 15
Inner diameter dimensions D7 and D formed by 5a, 15a
8 is the inner diameter dimension D formed by the line D0 at which the lead angle of the work 10 and the lead angle of the rolling dies 12, 12 are equal.
01, and the position M (see FIG. 6) where the frictional forces are balanced when the rolling dies 12, 12 and the work 10 are in contact does not move to the work 10 side, The worm portion 20a is rolled in a state in which the worm portion 20a is located on the inner diameter line formed by the line D0 at which the lead angle of the rolling dies 12 and the lead angle of the rolling dies 12 are equal.

Further, the length dimension L1 of the base portion 10b of the work 10 meshes with the worm shaft 20 in order to average the outer peripheral runout amount and the random walk amount caused by the bending of the worm shaft 20 formed by rolling in the longitudinal direction. It is generally larger than necessary for the meshing dimension with the worm wheel, but because the rolling is performed with the lead staggering suppressed as much as possible, the length of the base portion 10a cannot be increased. Even when it is used, the amount of runout and the amount of random walk can be suppressed with a small length.

[0026]

As described above, since the rolling apparatus and the rolling method according to the present invention have the above-described configurations, the shaft-shaped material is provided on the side of the rolling die immediately before the completion of rolling. Of the friction force generated when the rolling die comes into contact with the shaft-shaped material because the contact surface of the material pressing member formed on the line where the lead angle of the rolling die and the lead angle of the rolling die are equal Since the parts are arranged on the same line as the lead angle of the rolling die and the lead angle of the work, the axial material is rolled in the state where there is no flow. This is an excellent effect that the value becomes small and the meshing accuracy can be increased.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view of a main part of a rolling processing apparatus in a rolling processing apparatus and a rolling processing method according to the present invention.

FIG. 2 is a side view of a shaft-shaped material used in the rolling processing apparatus shown in FIG.

FIG. 3 is a horizontal sectional view around a rolling die and a shaft-shaped material in the rolling processing apparatus shown in FIG.

FIG. 4 is an explanatory view of a rolling die and a shaft-shaped material of a conventional rolling processing device.

FIG. 5 is a cross-sectional view illustrating a collision between a rolling die and a shaft-shaped material in a conventional rolling processing device.

FIG. 6 is an external view of a rolling die for explaining a flow generated in a shaft-shaped material in a conventional rolling processing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rolling processing apparatus 10 Shaft-shaped material (work) 10a Shaft part 10b Base part 10c, 10d Support part 12,12 Rolling die 14,15 Material pressing member 14a, 14a, 15a, 15a Contact surface 20a Worm part

Claims (6)

[Claims] 1. A rolling member for forming a worm portion into a shaft-shaped material having a cylindrical shaft portion made of metal and a columnar rolling base portion formed to be connected to the shaft portion by a pair of rolling dies. In the manufacturing apparatus, the shaft-shaped material has at least a shaft portion and a rolling base portion, and a columnar support portion having an outer diameter different from that of the shaft portion, and a pair of rolling dies. A material pressing member having an abutment surface facing the supporting portion is provided on the side portion, and the material pressing member is formed with a lead angle and a rolling angle of a worm portion formed into a shaft-shaped material immediately before the completion of rolling. A rolling device, wherein an abutting surface is arranged on an imaginary line connecting positions where the lead angles of the dies are equal to each other. 2. The material pressing member forms an abutting surface which is pressed against a single support section formed between the shaft section of the shaft-shaped material and the rolling base section. Roll processing equipment. 3. The rolling processing apparatus according to claim 1, wherein the material pressing member forms a contact surface that is pressed against the support portions formed on both sides of the rolling base portion of the shaft-shaped material. 4. A rolling member for forming a worm portion on a shaft-shaped material having a cylindrical shaft portion made of metal and a cylindrical rolling base portion formed to be connected to the shaft portion by a pair of rolling dies. A method for forming, wherein a shaft-shaped material having at least a shaft portion and a columnar support portion having an outer diameter different from the shaft portion between the shaft portion and the rolling base portion is used, and a pair of side portions of the rolling dies are used. A material pressing member having an abutting surface facing the support portion is arranged at a position where the lead angle of the worm portion formed on the shaft-shaped material and the lead angle of the rolling die are equal to each other immediately before the end of rolling. A rolling process method characterized in that the contact surface of the material pressing member is pressed against the support portion on a virtual line connecting the two. 5. The rolling method according to claim 4, wherein a shaft-shaped material in which a single support portion is formed between the shaft portion and the base portion is used. 6. The rolling method according to claim 4, wherein a shaft-shaped material having support portions formed on both sides of the base portion is used.