JP2002153935A - Method and apparatus for manufacturing cylindrical member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a shoulder part of a cylindrical member from being thinned and folded. SOLUTION: Since forming rollers 30 and 40 are moved from an opening end side of a cylindrical part 52 of a cup-shaped member 50 to a bottom part 51 side in the direction of the arrow (a) to approach the material on the outer circumferential surface side of the cylindrical part 52 to the shoulder part 53, the wall thickness of the shoulder part 53 is thickened to prevent the part 53 from being thined. Further, since a regulating part 22 located on the outer side of a ridge part 13 of a mandrel 10 is provided on a holding surface 21 of a fixing means to regulate the flow of the material approached to the shoulder part 53 and reduce the differential speed between the internal and external materials of the ridge part 13 in the vicinity of a root part 54, the occurrence of folding caused by the large differential speed can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical member manufacturing apparatus for forming a cylindrical member having a bottom portion and a cylindrical portion.
And a manufacturing method.

[0002]

2. Description of the Related Art FIGS. 7 (a) and 7 (b) show a method for manufacturing a cylindrical member used for manufacturing a cylindrical member having a bottom portion and a cylindrical portion from a disk-shaped blank material, and a method for manufacturing the cylindrical member. 1 shows an apparatus 1. In addition, the figure shows a part of a longitudinal sectional view passing through a common axis C of the cup-shaped member 2, the mandrel 3, and the fixing means 4. Here, the cup-shaped member 2 refers to an intermediate product in which the outer peripheral side of a disc-shaped blank is bent to provide a bottom portion 2a and a cylindrical portion 2b, and the cup-shaped member 2 as the intermediate product is further formed. Thus, a cylindrical member as a product is manufactured.

As shown in FIG. 7A, a manufacturing apparatus 1 comprises:
It includes a mandrel 3, fixing means 4, and roller members 5, 6. The cylindrical mandrel 3 is arranged inside the cup-shaped member 2, and the bottom 2 a of the cup-shaped member 2 is fixed between the end surface 3 a of the mandrel 3 and the holding surface 4 a of the fixing means 4. At this time, the mandrel 3
Are arranged so as to surround the outer peripheral surface 3b. In this state, the mandrel 3 and the fixing means 4 are rotated about the axis C to rotate the cup-shaped member 2. While moving the two forming rollers 5 and 6 along the axis C from the bottom 2a side toward the opening end of the cylindrical portion (the right side in the figure: not shown), the cylindrical portion 2b is moved. Is pressed toward the outer peripheral surface 3b of the mandrel 3. Thereby, the cylindrical portion 2b can be formed into a desired shape. For example, when the teeth 3c are formed on the outer surface 3b of the mandrel 3, the inner teeth of the cylindrical portion 2b can be cut into the teeth 3c to form the internal teeth.

However, using the above-described manufacturing apparatus 1,
When the cylindrical member is formed by the above-described manufacturing method, as shown in FIG. 8, the outer peripheral side wall (hereinafter referred to as “shoulder”) 2c of the connecting portion (hereinafter referred to as “shoulder”) 2c of the formed cylindrical member 2c. Material) is pulled short by the opening end side of the cylindrical portion 2b along with the movement of the forming rollers 5 and 6 in the direction of the arrow b, and the thickness t of the shoulder portion 2c is thinner than the thickness T of the bottom portion 2b. Become
A problem that the strength of the shoulder 2c is reduced occurs.

In order to solve such a problem, there is a method of reducing a drive-in amount y, which is a difference between an outer diameter of the cylindrical portion 2b of the cup-shaped member 2 before and after the molding. However, according to this method, since the inner peripheral side of the cylindrical portion 2b cannot be sufficiently digged into the teeth 3c of the outer peripheral surface 3b of the mandrel 3, there is a possibility that the processing accuracy of the internal teeth after molding may be reduced. In this way, it is possible to reduce the thickness t of the shoulder portion 2c to some extent by reducing the driving amount y, but the forming rollers 5, 6 are moved to the bottom portion 2a.
It is difficult to completely prevent the thickness of the shoulder 2c from being reduced because the shoulder 2c is moved from the side toward the opening end in the direction of the arrow b.

In view of this, as shown in FIG. 9, it is conceivable to move the forming rollers 5 and 6 in the direction of arrow a from the opening end side toward the bottom portion 2b, contrary to the above.

[0007]

As described above, when the forming rollers 5 and 6 are moved from the opening end to the bottom 2b,
Since the meat (material) on the outer peripheral surface side of the cylindrical portion 2b can be brought closer to the shoulder portion 2c, it is possible to effectively prevent the shoulder portion 2c from being thinned.

However, when the forming rollers 5 and 6 are moved in the direction of arrow a as described above, a fold K is generated in an inner portion (hereinafter referred to as a "root portion") 2d of the shoulder portion 2c, and the shoulder portion 2c is formed. The problem that the intensity | strength of 2c falls arises.
This is because, as shown in FIG. 9, the material flows in the same direction (the direction of arrow a) with the movement of the forming rollers 5 and 6, and the flow of the material near the shoulder 2c at this time is the left end of the material. Is unconstrained, the speed increases as it approaches the outer peripheral surface of the cylindrical portion 2b, and it decreases as it approaches the root 2d. And since it approaches 0 almost inside the root part 2d, the root part 2d
A large speed difference occurs between the outside and the inside of d. This large speed difference causes the fold K to occur.

Accordingly, the present invention provides a method of manufacturing a cylindrical member and a method of manufacturing a cylindrical member in which the thickness of the shoulder is reduced and the base of the shoulder is prevented from being bent, thereby preventing a reduction in the strength of the shoulder. It is an object to provide a manufacturing apparatus.

[0010]

Means for Solving the Problems Of the present invention according to claims 1 to 12 for achieving the above object, the present invention according to claims 1 to 6 relates to a method for manufacturing a cylindrical member. The present invention according to claims 7 to 12 in the latter half relates to an apparatus for manufacturing a cylindrical member.

First, the present invention according to claim 1 [for example,
FIG. 2], a method of manufacturing a cylindrical member from a cup-shaped member (50) having a bottom portion (51) and a cylindrical portion (52).
The cup-shaped member is formed by an end face (11) of a cylindrical mandrel (10) arranged inside the cup-shaped member and a clamping surface (21) of fixing means (20) arranged outside the cup-shaped member (50). The bottom (51) of the (50) is sandwiched and rotated, and the cylindrical portion (5) of the rotating cup-shaped member (50) is rotated.
2) Pressing the outer peripheral surface of the mandrel (110) toward the outer peripheral surface (12) of the mandrel (110) with the molding roller (30, 40) while pressing the molding roller (30, 40) to the cylindrical portion of the cup-shaped member (50). The mandrel (10) of the holding surface (21) of the fixing means (20) is moved from the opening end side of the (52) toward the bottom (51).
The bottom portion (51) of the forming roller (30, 40) is provided by a regulating portion (22) provided at a portion located outside a ridge portion (13) where the end surface (11) and the outer peripheral surface (12) intersect with each other. Regulates the flow of material as it moves to the side,
It is characterized by the following.

According to a second aspect of the present invention (see FIG. 2), in the method of manufacturing a cylindrical member according to the first aspect, the outer diameter (x) of the regulating portion (22) of the fixing means (20) is The cylindrical portion (5) before forming by the forming rollers (30, 40).
The outer diameter (D) of the cylindrical portion (52) after being formed by the forming rollers (30, 40) is set to be equal to or larger than the outer diameter (D) of the cylindrical roller (30, 40). And

According to a third aspect of the present invention (see, for example, FIG. 4), in the method of manufacturing a cylindrical member according to the first aspect,
Outer diameter (x) of the regulating portion (22) of the fixing means (20)
Is set smaller than the outer diameter (d) of the cylindrical portion (52) after being formed by the forming rollers (30, 40) to provide a material escape portion (23).

According to a fourth aspect of the present invention, there is provided a method for manufacturing a cylindrical member according to any one of the first to third aspects, wherein the holding surface (2) of the fixing means (20) is provided.
The mandrel (10) is provided on the outer peripheral portion of 1).
And a tapered surface (21a) having a larger protrusion amount toward the outer peripheral side with respect to a surface (S) orthogonal to the axis (C).

According to a fifth aspect of the present invention (see, for example, FIG. 6), in the method for manufacturing a cylindrical member according to any one of the first to fourth aspects, the fixing means (20) is provided with a fixing member disposed inside. A fixed portion (24), and a movable portion (25) disposed annularly outside the fixed portion (24). The fixed portion (24) is connected to an end surface (11) of the mandrel (10). A first holding surface (24a) for fixedly holding an inner portion of a bottom portion (51) of the cup-shaped member (50) therebetween;
And the movable part (25) is provided with the mandrel (1).
0) between the end face (11) and the cup-shaped member (50).
And a second holding surface (25a) for pressing an outer portion of the bottom portion (51) with a predetermined pressure.

Preferably, the mandrel is formed as shown in FIG.
The method according to any one of claims 1 to 5, wherein the outer peripheral surface (12) has external teeth (14).
Characterized by having

Next, the present invention according to claim 7 [for example,
FIG. 2], a cylindrical member manufacturing apparatus for forming a cylindrical member from a cup member (50) having a bottom portion (51) and a cylindrical portion (52).
And a fixing means (20) arranged outside the cup-shaped member (10), the end face (1) of the mandrel (10) being arranged inside the mandrel (10).
1) and the bottom (51) of the cup-shaped member (50).
Means (20) having a clamping surface (21) for clamping
And the cylindrical portion (52) of the cup-shaped member (50) rotated by the mandrel (10) and the fixing means (20) from the outer peripheral surface side to the outer peripheral surface (12) of the mandrel (10). Forming roller (3) moving in the direction of the axis (C) of the mandrel (10) while pressing
0, 40), and the forming roller (30, 40)
Is set in a direction from the opening end side of the cylindrical portion (52) to the bottom portion (51) side, and the moving direction of the fixing means (20) is set on the outer circumferential side of the holding surface (21) of the fixing means (20). A regulating portion (22) located outside a ridge portion (13) at which an end surface (11) and an outer peripheral surface (12) of the mandrel (10) intersect, and the molding roller is formed by the regulating portion (22). The flow of the material accompanying the movement of the (30, 40) to the bottom (51) side is regulated.

According to an eighth aspect of the present invention, there is provided an apparatus for manufacturing a cylindrical member according to the seventh aspect, wherein:
Outer diameter (x) of the regulating portion (22) of the fixing means (20)
Is smaller than the outer diameter (D) of the cylindrical portion (52) before forming by the forming rollers (30, 40), and the cylindrical portion (5) after forming by the forming rollers (30, 40).
2) Set equal to or larger than the outer diameter (d) of
It is characterized by the following.

According to a ninth aspect of the present invention, there is provided an apparatus for manufacturing a cylindrical member according to the seventh aspect, wherein:
Outer diameter (x) of the regulating portion (22) of the fixing means (20)
Is set smaller than the outer diameter (d) of the cylindrical portion (52) after being formed by the forming rollers (30, 40) to provide a material escape portion (23).

The present invention according to claim 10 [for example, FIG.
Reference!], In the apparatus for manufacturing a cylindrical member according to any one of claims 7 to 9, the holding surface (2) of the fixing means (20).
The mandrel (10) is provided on the outer peripheral portion of 1).
And a tapered surface (21a) having a larger protrusion amount toward the outer peripheral side with respect to a surface (S) orthogonal to the axis (C).

The present invention according to claim 11 [for example, FIG.
Reference], in the apparatus for manufacturing a cylindrical member according to any one of claims 7 to 10, wherein the fixing means (20) includes a fixing portion (24) disposed inside and an annular shape outside the fixing portion (24). And a movable part (25) disposed on the end surface (1) of the mandrel (10).
1) and the bottom (51) of the cup-shaped member (50).
The first holding surface (2) for fixedly holding the inner portion of
4a), wherein the movable portion (25) is provided between the cup-shaped member (5) and an end surface (11) of the mandrel (10).
And a second holding surface (25a) for pressing an outer portion of the bottom portion (51) with a predetermined pressure.

The present invention according to claim 12 is described in, for example, FIG.
Reference], in the apparatus for manufacturing a cylindrical member according to any one of claims 7 to 11, wherein the mandrel (10) has external teeth (14) on the outer peripheral surface (12).

In the above-mentioned [Means for Solving the Problems], the reference numerals in parentheses are for comparison with the drawings, but do not affect the description of the claims. .

[0024]

According to the first aspect of the present invention, by moving the forming roller from the opening end side of the cylindrical portion to the bottom side, the forming roller is moved to the shoulder portion which is the joint portion between the bottom portion and the cylindrical portion. Since the thickness (material) on the outer peripheral surface side of the cylindrical portion can be brought closer, the thickness of the shoulder portion can be increased to prevent the thickness from being reduced. In addition, by providing a regulating portion located outside the ridge of the mandrel on the holding surface of the fixing means, the flow of the material brought to the shoulder is regulated, and a portion corresponding to the ridge at the shoulder (root portion) Part), the difference in the speed of the material between the outside and the inside of the ridge line in the vicinity can be reduced, so that it is possible to prevent the occurrence of folding due to the large difference in the speed.

That is, it is possible to achieve both the prevention of the reduction in the thickness of the shoulder portion and the prevention of the occurrence of the breakage of the root portion.

According to the second aspect of the present invention, the outer diameter of the restricting portion is set to be smaller than the outer diameter of the cylindrical portion before molding and equal to or larger than the outer diameter of the circular portion after molding. By doing so, the flow of the material brought to the shoulder by the movement of the forming roller can be appropriately regulated, so that the root can be prevented from being broken.

According to the third aspect of the present invention, by providing the material escape portion, a part of the material brought to the shoulder by the movement of the forming roller in the thrust direction (the direction along the axis of the mandrel). The flow of the material is regulated by the regulation part and the other part of the material can be released to the relief part, preventing the root from being bent and reducing the processing load in the thrust direction of the forming roller can do.

According to the fourth aspect of the present invention, by providing the above-mentioned tapered surface on the outer portion of the holding surface of the fixing means, the flow of the material near the shoulder portion is increased on the side close to the forming roller. Since the flow on the side remote from the forming roller can be suppressed and suppressed, the difference in the flow speed of the material between the outside and the inside of the root portion can be further reduced.

According to the fifth aspect of the present invention, since the bottom portion can be pressed with a predetermined control pressure by the second holding surface of the movable portion, the flow of the material brought to the shoulder portion by the forming roller can be reduced. Control can be performed so that the root is not easily broken.

According to the sixth aspect of the present invention, it is possible to form a cylindrical member having an internal tooth on the inner peripheral surface of the cylindrical portion, the shoulder portion is not thin and the root is not bent.

According to the seventh aspect of the present invention, it is possible to obtain a manufacturing apparatus capable of reliably performing the manufacturing having the effects described in the first aspect.

Similarly, claims 8, 9, 10, 11, 12
The present invention according to the present invention (a manufacturing apparatus for a cylindrical member) obtains a manufacturing apparatus capable of reliably performing the manufacturing with the effects described in the above-described claims 2, 3, 4, 5, and 6 in this order. Can be. In brief, the present invention of claim 8 provides:
The flow of the material brought to the shoulder can be appropriately regulated to prevent the root from being bent. According to the ninth aspect of the present invention, it is possible to prevent the root portion from being bent and reduce the processing load in the thrust direction of the forming roller. According to the tenth aspect of the present invention, it is possible to further reduce the speed difference of the flow of the material between the outside and the inside of the root portion.
According to the eleventh aspect of the present invention, it is possible to control the flow of the material brought to the shoulder by the forming roller so that the root is hardly broken. The present invention according to claim 12, a cylindrical member having internal teeth on the inner peripheral surface of the cylindrical portion,
It can be formed so that the shoulder is not thin and the root is not bent.

[0033]

Embodiments of the present invention will be described below with reference to the drawings.

<Embodiment 1> FIG.
1 shows an example of an apparatus for manufacturing a cylindrical member. The figure shows a part of a vertical sectional view of the cylindrical member manufacturing apparatus M cut along a plane passing through an axis C thereof.

The cup-shaped member 50 to be molded by the cylindrical member manufacturing apparatus (hereinafter simply referred to as “manufacturing apparatus M”) shown in FIG. It is a member (semi-finished product) provided with 51 and a cylindrical portion 52. A shoulder portion 53 is formed at a connection portion between the bottom portion 51 serving as a bent portion and the cylindrical portion 52, and an open end (not shown) is provided on the opposite side of the cylindrical portion 52 to the shoulder portion 53 (the right side in the drawing). Is formed.

A manufacturing apparatus M for forming such a cup-shaped member 50 includes a mandrel 10, fixing means 20, and forming rollers 30, 40.

The entire mandrel 10 is formed in a substantially columnar shape and has an end face 11 and an outer peripheral face 12. The end face 11 is formed in a planar shape,
0 together with the bottom surface 51 of the cup-shaped member 50.
Sandwich. Assuming that a portion where the end face 11 and the outer peripheral surface 12 intersect is a ridge line portion 13, the outer peripheral surface 12 has the ridge line portion 13.
From the part slightly shifted to the right in FIG.
Are formed. The mandrel 10 is a cup-shaped member 5
The end surface 11 is in contact with the inner surface of the bottom portion 51, and the outer peripheral surface 12 is disposed immediately inside the cylindrical portion 52. The mandrel 10 is configured to be rotatable about an axis C.

The fixing means (fixing tool) 20 is arranged outside the cup-shaped member 50. The fixing means 20 has a clamping surface 21 facing the end surface 11 of the mandrel 10 described above. The holding surface 21 in the present embodiment is formed in a flat shape, and holds the bottom 51 of the cup-shaped member 50 between the holding surface 21 and the end surface 11 of the mandrel 10 described above. A regulating portion 22 is provided on the outer peripheral side of the holding surface 21. As shown in FIG. 2, which is an enlarged view of the vicinity of the shoulder 53 of the cup-shaped member 50, the restricting portion 22 is formed by a portion of the sandwiching surface 21 which is located outside the ridge 13 of the mandrel 10. Is configured. In the present embodiment,
The outer diameter x of the regulating portion 22 (same as the outer diameter of the sandwiching surface 21) is the outer diameter of the cylindrical portion 52 of the cup-shaped member 50 before forming by the forming rollers 30 and 40 described later (in FIG. Shown)
It is set to be smaller than D and equal to or larger than the outer diameter d (shown by a solid line in FIG. 2) of the cylindrical portion 52 after being formed by the forming rollers 30 and 40. That is, in the present embodiment, the outer diameter x of the regulating portion 22 is set to d ≦ x <D. However, the forming rollers 30, 4 described below
Considering that 0 is moved in the direction of arrow a along the axis C, it is preferable that the outer diameter x of the restricting portion 22 be set to be substantially equal to the outer diameter d of the cylindrical portion 52 after molding. Fixing means 2
Reference numeral 0 is also rotatable about the axis C, similarly to the above-described mandrel 10.

The forming rollers 30 and 40 are each provided with an axis C
Are supported so as to be rotatable about axes 31 and 41 (see FIG. 1) parallel to. The forming rollers 30 and 40 are rollers for roughing and finishing, respectively.
The outer circumference of 0 is disposed so as to slightly project toward the cup-shaped member from the outer circumference of the forming roller 30. The forming rollers 30 and 40 move in the direction of arrow a (the cylindrical portion 52) along the axis C.
(In the direction from the opening end side toward the bottom 51 side) and in the opposite direction.

Next, the operation of the manufacturing apparatus having the above-described structure, that is, a method of manufacturing a cylindrical member according to the present invention (hereinafter, simply referred to as “manufacturing method”) will be described.

The mandrel 1 is provided inside the cup-shaped member 50.
0, the end face 11 of the mandrel 10 and the fixing means 20
, The bottom surface 51 of the cup-shaped member 50
Between the inside and outside.

With the cup-shaped member 50 held therebetween,
By rotating the mandrel 10 and the fixing means 20, the cup-shaped member 50 is rotated.

On the opening end side of the cylindrical portion 52 of the cup-shaped member 50, the forming rollers 30, 40 are cut into the outer peripheral surface of the cylindrical portion 52 by a predetermined driving amount (corresponding to the above-mentioned D-d) to form the cylindrical portion. 52 is pressed against the outer peripheral surface 12 of the mandrel 10. While maintaining this state, the forming roller 30,
By moving the cylinder 40 in the direction of arrow a, the meat (material) on the outer peripheral surface side of the cylindrical portion 52 is sequentially moved to the downstream side of the forming rollers 30 and 40, and the inner peripheral portion of the cylindrical portion 52 is The material of the surface is sequentially bitten.

When the forming rollers 30, 40 approach the shoulder 53 of the cup-shaped member 50, the material is sufficiently brought to the shoulder 53 of the cup-shaped member 50, and the thickness t of the shoulder 53 (see FIG. 8) is not thinned. Moreover, when the forming rollers 30 and 40 reach the vicinity of the shoulder 53, the flow of the material is regulated by the regulating part 22 of the fixing means 20, so that the root 54 (the ridge 13 of the mandrel 10) which is the inner part of the shoulder 53. Fold K
(See FIG. 9) does not occur. This is Regulatory Department 2
By providing 2, the difference in the flow velocity of the material between the outside and the inside of the base portion 54 can be reduced.

As described above, according to the present embodiment, it is possible to effectively prevent both the reduction in the thickness of the shoulder 53 and the occurrence of breakage at the base 54.

In the above description, the manufacturing apparatus M according to the present invention is used.
In the above, the case where the cylindrical member is formed from the cup-shaped member 50 has been described. However, the process of forming the cup-shaped member 50 from the disc-shaped blank material may be performed by the manufacturing apparatus M.

As for the forming roller, a forming roller may be additionally provided in addition to the two forming rollers 30 and 40 described above.

<Second Embodiment> FIG. 3 shows a second embodiment.

The present embodiment is characterized in that the outer peripheral side of the holding surface 21 including the regulating portion 22 is formed as a tapered surface 21a.

The tapered surface 21a is a tapered surface such that the amount of protrusion from the surface S orthogonal to the axis C (see FIG. 1) increases toward the outer periphery. The angle θ of the tapered surface 21a with respect to the surface S is set to, for example, 3 to 5 degrees.

By providing such a tapered surface 21a, the flow of the material near the shoulder 53 is greatly suppressed on the side near the forming rollers 30 and 40 (portion P in FIG. 3). , 40 (the Q in FIG. 3)
The flow rate of the material between the outside (Q section) and the inside (R section) of the root portion 54 can be further reduced.

Thus, it is possible to prevent the occurrence of breakage at the base portion 54 of the shoulder portion 53 more favorably.

Note that the angle θ of the tapered surface 21a is not limited to the above-mentioned 3 to 5 degrees, and the fluidity of the material and the forming rollers 30, 4
It may be set appropriately in consideration of a moving speed of 0 or the like. However, if the angle θ is too large, the strength of the shoulder 53 will decrease.

Third Embodiment FIG. 4 shows a third embodiment.

This embodiment is characterized in that a material escape portion 23 is provided outside the regulating portion 22.

The outer diameter x of the regulating portion 22 is
The relief portion 23 for the material is provided so as to be smaller than the outer diameter d of the cylindrical portion formed by 40. By providing the relief portion 23, a part of the material brought to the shoulder portion 53 by the forming rollers 30 and 40 can escape to the relief portion 23. Thereby, the processing load of the forming rollers 30 and 40 in the thrust direction (the direction of the arrow a) can be reduced.

Even when the relief portion 23 is provided, the width in the diameter direction of the restriction portion 22 (the length in the vertical direction in FIG. 4).
Is preferably made as large as possible to prevent the root portion 54 from being bent. These escape parts 2
3 and the width of the restricting portion 22, the material and size of the cup-shaped member 50, and the forming rollers 30 and 40.
The optimal size may be determined by, for example, an experiment according to the moving speed of the robot.

<Fourth Embodiment> FIG. 5 shows a fourth embodiment.

In the present embodiment, the relief portion 23 in the third embodiment is formed so as to extend further in the moving direction of the forming rollers 30 and 40, thereby forming a product having an H-shaped cross section. Features.

According to the present embodiment, even when a product having such an H-shaped cross section is formed, it is possible to effectively prevent the root portion 54 from being bent.

<Fifth Embodiment> FIG. 6 shows a fifth embodiment.

The present embodiment is characterized in that the fixing means 20 is divided into a fixed part 24 and a movable part 25.

That is, the fixing means 20 is divided into a fixed part 24 arranged inside and a movable part 25 arranged annularly outside the fixed part 24. The first fixed portion 24 is provided with a first holding surface 24a for fixedly holding the inner portion of the bottom portion 51 of the cup-shaped member 50 between the fixed portion 24 and the end surface 11 of the mandrel 10; 25,
A second portion for pressing an outer portion of the bottom portion 51 of the cup-shaped member 50 between the end surface 11 of the mandrel 10 and the end portion 11 with a predetermined pressure;
Is provided. The movable portion 25 is configured to be movable in the axial direction with respect to the fixed portion 24, and the pressing force for pressing the bottom portion 51 is controlled by, for example, hydraulic pressure.

By providing such a movable portion 25, the flow of the material brought to the shoulder portion 53 by the forming rollers 30, 40 is appropriately controlled so that the root portion 54 is unlikely to be bent. be able to. The control pressure of the movable part 25 at this time can be set based on a stress (σ) -strain (ε) diagram shown in FIG. As the control pressure, for example, it is preferable to set the pressure as high as possible within a range F below the descending yield point in FIG. By setting the control pressure in this manner, the movable portion 25 becomes flexible with respect to the force acting from the material. As a result, FIG.
The restriction on the flow of the material inside the shoulder portion 54 is eased, and the difference in the flow velocity between the material outside and inside the shoulder portion 54 can be reduced. Therefore, as compared with the case where the entire fixing member 20 is fixedly configured (the case of FIG. 3), the folding is less likely to occur. Further, since the control pressure is set to be equal to or lower than the falling yield point as described above,
There is no possibility that the bottom portion 51 of the cup-shaped member 50 is unnecessarily plastically deformed.

[Brief description of the drawings]

FIG. 1 is a part of a longitudinal sectional view showing a schematic configuration of a first embodiment of a cylindrical member manufacturing apparatus according to the present invention.

FIG. 2 is a longitudinal sectional view of the vicinity of a shoulder of a cup-shaped member according to the first embodiment.

FIG. 3 is a longitudinal sectional view of the vicinity of a shoulder of a cup-shaped member according to a second embodiment.

FIG. 4 is a longitudinal sectional view of the vicinity of a shoulder of a cup-shaped member according to a third embodiment.

FIG. 5 is a longitudinal sectional view of the vicinity of a shoulder of a cup-shaped member according to a fourth embodiment.

FIG. 6 is a longitudinal sectional view of the vicinity of a shoulder of a cup-shaped member according to a fifth embodiment.

FIGS. 7A and 7B are diagrams illustrating a conventional cylindrical member manufacturing apparatus and method.

FIG. 8 is a view for explaining how the thickness of the shoulder is reduced.

FIG. 9 is a view for explaining how a bend occurs at the base of the shoulder.

FIG. 10 is a stress-strain diagram showing the relationship between stress and strain acting on a material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manufacture apparatus of cylindrical member 10 Mandrel 11 End face of mandrel 12 Outer peripheral surface of mandrel 13 Ridge part 14 External teeth (tooth part) 20 Fixing means 21 Nipping surface of fixing means 21a Tapered surface 22 Restriction part 23 Escape part 24 Fixed part 24a 1 clamping surface 25 movable portion 25a second clamping surface 30, 40 forming roller 50 cup-shaped member 51 bottom 52 cylindrical portion 53 shoulder 54 base C axis of mandrel D outer diameter of cylindrical portion before molding d after molding M Outside diameter of cylindrical part M Manufacturing device for cylindrical member S Surface orthogonal to axis x Outside diameter of regulating part

Continued on the front page (72) Inventor Hideyuki Nagai 10 Takane, Fujii-machi, Anjo, Aichi Prefecture Inside Aisin AW Co., Ltd. In GW Corporation

Claims (12)

[Claims] 1. A method for manufacturing a cylindrical member for forming a cylindrical member from a cup-shaped member having a bottom and a cylindrical portion, comprising: an end surface of a cylindrical mandrel disposed inside the cup-shaped member; The bottom of the cup-shaped member is pinched and rotated by the pinching surface of the fixing means arranged outside the cup-shaped member, and the outer peripheral surface of the rotating cylindrical portion of the cup-shaped member is formed on the outer peripheral surface of the mandrel by a forming roller. Moving the forming roller from the opening end side of the cylindrical portion of the cup-shaped member toward the bottom side while pressing toward the end surface, and the end surface and the outer peripheral surface of the mandrel among the holding surfaces of the fixing means, A regulating portion provided at a portion located outside the intersecting ridge portion regulates a material flow accompanying the movement of the forming roller to the bottom side. Method of manufacturing a tubular member. 2. An outer diameter of the regulating portion of the fixing means is smaller than an outer diameter of the cylindrical portion before being formed by the forming roller, and is equal to an outer diameter of the cylindrical portion after being formed by the forming roller. The method for manufacturing a cylindrical member according to claim 1, wherein the value is set to be larger than this. 3. The material release portion is provided by setting an outer diameter of a restricting portion of the fixing means smaller than an outer diameter of the cylindrical portion after being formed by the forming roller. 3. The method for manufacturing a cylindrical member according to item 1. 4. An outer peripheral portion of the holding surface of the fixing means has a tapered surface having a larger amount of protrusion toward an outer peripheral side with respect to a surface orthogonal to the axis of the mandrel. Item 4. The method for producing a cylindrical member according to any one of Items 1 to 3. 5. The fixing means has a fixed portion disposed inside, and a movable portion disposed annularly outside the fixed portion, wherein the fixed portion is provided between an end surface of the mandrel. A first holding surface for fixedly holding an inner portion of a bottom portion of the cup-shaped member; an outer portion of the bottom portion of the cup-shaped member between the movable portion and an end surface of the mandrel; The method according to any one of claims 1 to 4, further comprising a second holding surface for pressing the second member with a predetermined control pressure. 6. The method for manufacturing a cylindrical member according to claim 1, wherein the mandrel has external teeth on the outer peripheral surface. 7. A cylindrical member manufacturing apparatus for forming a cylindrical member from a cup-shaped member having a bottom portion and a cylindrical portion, wherein: a cylindrical mandrel disposed inside the cup-shaped member; and the cup-shaped member. Fixing means having a holding surface for holding the bottom of the cup-shaped member between the end face of the mandrel and the cup-shaped member rotated by the mandrel and the fixing means. A forming roller that moves in the axial direction of the mandrel while pressing the cylindrical portion of the member from the outer circumferential surface side toward the outer circumferential surface of the mandrel, and the moving direction of the forming roller is changed to the opening end of the cylindrical portion. From the side to the bottom side, and a ridge where an end surface and an outer peripheral surface of the mandrel intersect on an outer peripheral side of the holding surface of the fixing means. The restricting portion located outside provided than parts to regulate the flow of accompanying materials to move to the bottom side of the forming roller by the regulating unit, the manufacturing apparatus the cylindrical member, characterized in that. 8. An outer diameter of the regulating portion of the fixing means is smaller than an outer diameter of the cylindrical portion before being formed by the forming roller, and is equal to an outer diameter of the cylindrical portion after being formed by the forming roller. The apparatus for manufacturing a cylindrical member according to claim 7, wherein the setting is made larger than this. 9. The material release portion is provided by setting an outer diameter of a regulating portion of the fixing means smaller than an outer diameter of the cylindrical portion after being formed by the forming roller. 3. A manufacturing device for a cylindrical member according to claim 1. 10. An outer peripheral portion of a holding surface of the fixing means, wherein a tapered surface having a larger amount of protrusion toward an outer peripheral side with respect to a surface orthogonal to an axis of the mandrel is provided. Item 10. An apparatus for manufacturing a cylindrical member according to any one of Items 7 to 9. 11. The fixing means has a fixed part arranged inside and a movable part annularly arranged outside the fixed part, wherein the fixed part is provided between an end face of the mandrel. A first holding surface for fixedly holding an inner portion of a bottom portion of the cup-shaped member; an outer portion of the bottom portion of the cup-shaped member between the movable portion and an end surface of the mandrel; 11. The apparatus for manufacturing a cylindrical member according to claim 7, further comprising: a second holding surface that presses the second holding member with a predetermined control pressure. 12. 12. The apparatus according to claim 7, wherein the mandrel has external teeth on the outer peripheral surface.