JP2002282965A - Cylindrical product with flange and its forming method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical product having a flange formed of a single plate, and a forming method and an apparatus for the product. SOLUTION: A cylindrical work 13 is filled with liquid 17 therein, a lid closes its open end, and the work 13 is axially compressed. Hydraulic pressure generated in the liquid 17 by the compression coupled with an axial compressing force expands radially outwardly the axially middle portion of the work 13. While the expanded portion is pressed against a transcription die 44 disposed radially outwardly, the portion is axially sandwiched to form the flange 47.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical product with a flange having a flange portion formed at an intermediate portion in the axial direction of the cylindrical portion, and a method and an apparatus for forming the same. The present invention relates to a cylindrical product with a flange, in which the cylindrical portion and the tooth portion are molded from the same plate material, and a molding method and apparatus therefor.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show an example of a cylindrical product with a flange.

As shown in FIG.
Is formed continuously at a cylindrical portion 61, a flange portion 62 formed in a circumferential direction at an axially intermediate portion of the cylindrical portion 61, and a lower end portion of the cylindrical portion 61, and formed to have a smaller diameter than the cylindrical portion 61. And a cylindrical boss 63 formed. In addition, the illustrated cylindrical product 60 with a flange shows an example in which a tooth shape is formed on the flange portion 62.

[0004] As described above, a cylindrical product 60 with a flange having a flange portion 62 at an intermediate portion in the axial direction of the cylindrical portion 61 cannot be formed by ordinary press working using a mold.

That is, even if a cylindrical plate material is pressed to form the cylindrical portion 61, the flange portion 62, and the boss portion 63 integrally, the flange portion 62 projects radially outward from the cylindrical portion 61. Therefore, a mold having such a shape cannot be placed in a cylindrical plate.

Therefore, conventionally, when manufacturing a cylindrical product with a flange, as shown in FIG.
2 and the boss 63 are separately formed, and they are joined by welding. In the drawing, 64 and 65 indicate welding locations.

[0007]

However, as described above, when the cylindrical portion 61, the flange portion 62, and the boss portion 63 are separately formed and welded, the number of steps is naturally increased and the manufacturing cost is high.

[0008] Further, since thermal deformation occurs during welding and joining,
Poor dimensional accuracy, requiring machining after welding in some cases.

Further, the material around the welded portion changes due to the heat of welding and the hardness is reduced, so that the strength around the welded portion is weakened.

Accordingly, an object of the present invention is to solve the above problems and to provide a cylindrical product with a flange formed from the same plate material and a method and apparatus for forming the same.

[0011]

Means for Solving the Problems In order to achieve the above object, a method for forming a cylindrical product with a flange according to the first invention comprises:
A cylindrical work is filled with liquid, and in this state, the opening end face of the work is covered and pressed in the axial direction, and by the liquid pressure and the axial pressing force of the liquid compressed and pressed by the pressing, The intermediate part in the axial direction of the work is pushed radially outward, and the pushed part is pressed against a transfer die arranged radially outward, and is sandwiched from the axial direction to form a flange part. Things.

According to this, the cylindrical portion and the flange portion can be integrally formed from a cylindrical work made of the same plate.

Further, a tooth profile may be formed on the transfer die, and the tooth profile may be formed on the flange portion.

According to a second aspect of the present invention, there is provided an apparatus for molding a cylindrical product with a flange, a filling means for filling a liquid into a cylindrical work, and an opening end surface of the work in a state where the liquid is filled inside the work. The upper part and the lower part of the punch which presses the lid and presses it in the axial direction. And a transfer die which is pressed against the transfer surface formed in the above and is sandwiched from the axial direction. This “molding device for a cylindrical product with a flange” is used for carrying out the “method for molding a cylindrical product with a flange” according to the first aspect of the present invention.

Further, a tooth shape may be formed on the transfer surface of the transfer mold.

A cylindrical product with a flange according to a third aspect of the present invention comprises:
The cylindrical portion and the flange portion are integrally formed from the same plate material.

According to a fourth aspect of the present invention, there is provided a cylindrical product having a flange.
The cylindrical portion, the flange portion, and the boss portion are all integrally formed from the same plate.

In the cylindrical product with a flange according to the third and fourth aspects of the invention, the inside of the cylindrical work is filled with liquid, and in this state, the opening end face of the work is covered and pressed in the axial direction. By the liquid pressure of the liquid to be compressed and pressurized and the pressing force in the axial direction, the intermediate part in the axial direction of the work is pushed radially outward, and the pushed part is disposed radially outward. The flange portion may be formed by being pressed against the transfer mold and sandwiched from the axial direction to form the flange portion.

Further, a tooth profile may be formed on the flange portion.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an apparatus for forming a cylindrical product with a flange according to the present embodiment. FIG. 1 (a) shows a state before forming, and FIG. 1 (b) shows a state after forming.

The present inventors have disclosed Japanese Patent Application Laid-Open No. 2000-140988.
As shown in the publication, an axial force and an internal pressure by a liquid are applied to a work having a cylindrical portion by using a normal press device, whereby a flange portion (teeth portion) is formed in the entire axial direction. A method and an apparatus for forming a tubular body are proposed. The present invention further improves the method and the apparatus for forming a cylindrical body so that a cylindrical product with a flange having a flange portion at an intermediate portion in the axial direction of the cylindrical portion can be press-formed from the same plate material.

In this embodiment, a flanged cylindrical product having a tooth profile is shown as a flanged cylindrical product. Hereinafter, the flange portion will be referred to as a tooth portion. Therefore,
The tooth portion used in the present specification indicates an example of a flange portion, and the flange portion of the present invention is not limited to a tooth shape.

As shown in FIG.
A mounting table 16 for vertically mounting the cylindrical work 13 composed of the large cylinder part 11, the bottom plate part 15, and the small cylinder part 12 on the lower surface of the small cylinder part 12 is attached to the upper surface of the table. I have. The mounting table 16 is formed in a cylindrical shape having a diameter substantially equal to the outer diameter of the small cylindrical portion 12 of the work 13. Mounting table 1
6 also has a function of sealing the lower end face of the work 13 so that a liquid 17 described later does not leak from inside the work 13.

A cylindrical lower mold 19 is mounted on the upper surface of the lower base 10 outside the mounting base 16 and the work 13 mounted thereon. The lower mold 19 constitutes a transfer mold 21 together with an upper mold 20 described later. On the inner surface of the lower mold 19, the small cylindrical portion 12 of the work 13 is formed at the lower end.
A small-diameter hole 22 having a diameter substantially equal to the outer diameter of
2, a large-diameter hole 23 having a diameter substantially equal to the outer diameter of the large cylindrical portion 11 of the work 13, and a tooth portion formed at the upper end portion and formed in the same shape as the tooth shape to be formed on the work 13. 25 are formed. The axial length (vertical length in FIG. 1) of the tooth portion 25 is formed to be longer than the axial length of the tooth shape to be formed on the work 13.

The lower mold 19 is supported by a plurality of springs 26 attached to the lower base 10 at equal intervals in the circumferential direction so as to be able to move up and down.

On the other hand, a punch 29 is attached to the lower surface of the upper base 27 of the press device. The punch 29 includes an axial force punch portion 33 having a diameter equal to the outer diameter of the large cylinder portion 11 of the work 13, a projection 30 having a diameter smaller than the inside diameter of the large cylinder portion 11 of the work 13, and a tip of the projection 30. A cylindrical projection 31 is provided at the center and has a diameter smaller by a predetermined dimension than the inner diameter of the small cylindrical portion 12 of the work 13. The protrusion 30 is not limited to a circular cross section as described above, but may be a square cross section.

A filling means 39 for filling the liquid (oil or water) 17 into the work 13 is connected to the punch 29. The axial force punch portion 33 of the punch 29 also has a function of sealing the upper end surface of the work 13 so that the liquid 17 does not leak from inside the work 13. Therefore, the upper and lower end surfaces of the work 13 are covered by the mounting table 16 and the axial force punch portion 33, and a compression chamber 34 is formed therein.

The filling means 39 includes a liquid passage 35 formed in the punch 29 and the check valve 3 connected to the liquid passage 35.
6, a pump 37 connected to a check valve 36, and a pump 3
7 and a tank (not shown). The liquid passage 35 has one end open to the compression chamber 34 and the other end connected to the check valve 3.
6 is connected.

Instead of providing the filling means 39, a liquid tank previously filled with liquid is placed on the lower base 10 and the lower mold 1
The work 9 and the mounting table 16 may be immersed below the liquid surface, and when the work 13 is mounted on the mounting table 16, the liquid may automatically flow into and fill the work 13. In this case, the configuration becomes simple and the cost is reduced.

The punch 29 is connected to a relief means 42 for keeping the liquid pressure of the liquid 17 in the work 13 at an appropriate value. The relief means 42 includes a liquid passage 40 formed in the punch 29 and a relief valve 41 connected to the liquid passage 40. The appropriate value of the hydraulic pressure is appropriately set based on the shape of the tooth profile to be molded, the thickness of the work 13, the tensile strength of the material of the work 13, and the like. Relief valve 41
Can change the relief pressure in accordance with an appropriate value. The liquid relieved from the relief valve 41 is
It is returned to a tank (not shown) connected to the pump 37.

On the other hand, a cylindrical upper die 20 is mounted on the upper base 27 outside the punch 29. On the outer periphery of the lower end of the upper mold 20, there are formed teeth 43 that mesh with the teeth 25 of the lower mold 19. Therefore, when the upper base 27 is lowered, the teeth 43 of the upper mold 20 mesh with the teeth 25 of the lower mold 19 like splines.

The axial length of the tooth portion 43 of the upper die 20 is shorter than the tooth portion 25 of the lower die 19, and when the upper base 27 is located at the bottom dead center, the tooth length of the lower die 19 is reduced. Reference numeral 25 denotes a state where the workpiece 25 is exposed without being aligned with the teeth 43 of the upper mold 20 by an axial length to be formed on the work 13. by this,
When the upper base 27 is located at the bottom dead center, the transfer surface 44 is constituted by the lower surface 43 a of the upper mold tooth 43, the tooth 25 of the lower mold 19, and the bottom 25 a of the tooth 25 of the lower mold 19. You.

Next, the operation of this embodiment will be described.

First, as shown in FIG. 2, a disk-shaped plate 46 having a center hole 45 is formed by a normal press working with a die, as shown in FIG. A work 13 having 12 is formed.

Next, in a state where the upper base 27 in FIG. 1 is raised and the punch 29 is separated from the lower mold 19, FIG.
As shown in (a), the work 13 is accommodated in the lower mold 19 and placed on the mounting table 16. Thereafter, the upper base 27 is lowered, and the axial force punch portion 33 of the punch 29 comes into contact with the upper end surface of the work 13. As a result, the upper and lower end surfaces of the work 13 are covered by the mounting table 16 and the axial force punch portion 33, and a compression chamber 34 is defined therein. In this state, the filling means 3
The liquid 17 is filled in the compression chamber 34 by 9 or a liquid tank.

When the liquid 17 is filled in the compression chamber 34, the upper table 27 is lowered. When the upper base 27 is lowered, the upper end face of the work 13 is pressed axially downward by the axial force punch portion 33 of the punch 29. At this time, the punch 29
, The volume of the liquid 17 is reduced, the liquid 17 is compressed and pressurized, and the liquid pressure is increased.

The liquid 17 that has been compressed and pressed tends to leak from the open end face of the work 13, but the upper and lower end faces of the work 13 are in strong contact with the mounting table 16 and the axial force punch 33, so that the liquid 17 is actually Does not leak. When the hydraulic pressure becomes equal to or higher than the appropriate value, a part of the liquid 17 is discharged from the compression chamber 34 by the relief means 42, and the hydraulic pressure is maintained at the appropriate value.

When the punch 29 descends, the teeth 43 of the upper mold 20 mesh with the teeth 25 of the lower mold 19. The pressing force of the punch 29 downward in the axial direction and the liquid pressure (internal pressure) of the liquid 17 compressed and pressed by the pressing force cause the work 13 to move.
1A is expanded radially outward while being increased in thickness, and pressed against the transfer surface 44, as indicated by the dotted line in FIG.

That is, the punch 29 not only presses the upper end face of the work 13 in the axial direction, but also presses the liquid 17
Is applied to the liquid 17 to press the work 13 radially outward. At this time, the liquid 17 becomes a radial hydraulic punch. Therefore, even if the work 13 is pressed in the axial direction, the work 13 does not buckle.

When the punch 29 is further lowered, the pushed-out portion is brought into contact with the lower surface 43 a of the tooth portion 43 of the upper die 20,
The portion of the lower mold 19 that is sandwiched in the axial direction between the bottom surface 25 a of the tooth portion 25 and expanded is gradually formed along the shape of the transfer surface 44. At this time, since the liquid 17 has also entered the inside of the molded portion, the liquid pressure is applied to the outside of the molded portion, so that the molded portion does not buckle inside the transfer surface 44. When the upper base 27 descends to the bottom dead center, FIG.
As shown in (b), the outer peripheral portion of the work 13 is thickened,
Further, a tooth portion 47 having a predetermined shape is formed in a circumferential direction at an axially intermediate portion thereof.

On the other hand, when the punch 29 is lowered to some extent, the cylindrical projection 31 of the punch 29 is inserted inside the small cylindrical portion 12 of the work 13 and the lower surface of the projection 30 is
Abuts on the inner surface of the bottom surface portion 15 of the second member.

When the punch 29 further descends, the punch 29
The compression force of the spring 26 causes the lower mold 19 to move downward, thereby allowing the small cylinder portion 12 to be compressed. As a result, the small cylindrical portion 12 of the work 13 is axially pressed by the lower surface of the protruding portion 30 and the upper surface of the mounting table 16 to increase the thickness,
The boss 49 is formed. Cylinder projection 31 of punch 29
Is appropriately set in consideration of the increase in the thickness of the small cylinder portion 12.

As described above, according to the present embodiment, as shown in FIG. 4, a cylindrical product 51 with a flange in which the cylindrical portion 50, the tooth portion (flange portion) 47, and the boss portion 49 are all integrally formed from the same plate material. Can be molded.

Therefore, the number of manufacturing steps can be reduced as compared with the conventional case, and the manufacturing cost can be reduced.

In addition, no welding is required and the transfer surface 4
Since the shape of No. 4 can be accurately transferred, high-precision molding can be performed. Therefore, no machining is required after molding, and the cost can be reduced.

In addition, no welding is required, and the teeth 47
Since the thickness of the boss portion 49 and the like can be increased from the thickness of the work 13, a product having high strength can be provided.

Furthermore, since it is formed from a plate material, it is light, and the weight of the product can be reduced.

The present invention is not limited to the cylindrical product with a flange shown in the figures, but includes, for example, a cylindrical product with a cylindrical portion and a flange portion, and a cylindrical product with a cylindrical portion, a bottom plate portion and a flange portion. Needless to say, the present invention can also be applied to the above.

[0050]

In summary, according to the present invention, the following excellent effects are exhibited. 1) Manufacturing costs can be reduced. 2) A highly accurate cylindrical product with a flange can be provided. 3) A high-strength cylindrical product with a flange can be provided.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing an apparatus for molding a cylindrical product with a flange according to an embodiment of the present invention, and shows a state before molding. (B) is sectional drawing which shows the shaping | molding apparatus of the cylindrical article with a flange which concerns on one Embodiment of this invention, and has shown the state after shaping | molding.

FIG. 2 is a perspective view of a plate used for forming a work.

FIG. 3 is a perspective view of a work.

FIG. 4A is a cross-sectional view of a flanged cylindrical product formed by the flanged cylindrical product forming apparatus shown in FIG. 1; FIG. 4B is a partial plan view showing the teeth in FIG.

FIG. 5 is a perspective view showing an example of a cylindrical product with a flange.

FIG. 6 is a perspective view showing an example of a cylindrical product with a flange.

FIG. 7 is a sectional view of a conventional cylindrical product with a flange.

[Explanation of symbols]

 13 Work 17 Liquid 19 Lower Die 20 Upper Die 21 Transfer Die 29 Punch 39 Filling Means 42 Relief Means 44 Transfer Surface 47 Tooth (Flange) 49 Boss 50 Cylindrical

Claims (8)

[Claims] 1. A method for forming a cylindrical product with a flange having a flange portion formed in a circumferential direction at an intermediate portion in the axial direction of the cylindrical portion, wherein a liquid is filled inside a cylindrical work, and the liquid is filled in that state. Cover the open end face of the work and press in the axial direction,
By the liquid pressure of the liquid compressed and pressurized by the pressing and the pressing force in the axial direction, the axially intermediate portion of the work is pushed radially outward, and the pushed portion is pushed radially outward. A method of molding a cylindrical product with a flange, characterized in that a flange portion is molded by pressing against an arranged transfer mold and sandwiching the flange from an axial direction. 2. The method according to claim 1, wherein a tooth profile is formed on the transfer die, and the tooth profile is formed on the flange portion. 3. A molding device for a cylindrical product with a flange having a flange portion formed in a circumferential direction at an intermediate portion in the axial direction of the cylindrical portion, and a filling means for filling a liquid into a cylindrical workpiece. A punch that covers the opening end face of the work in a state where the liquid is filled in the inside of the work and presses the work in the axial direction, and an upper mold and a lower mold, and the pressing force of the punch and the hydraulic pressure in the work. And a transfer die for pressing an intermediate portion in the axial direction of the work, which has been pushed outward in the radial direction by an axial direction, onto a transfer surface formed on the inner surface and sandwiching the work from the axial direction. . 4. The molding device for a cylindrical product with a flange according to claim 3, wherein a tooth profile is formed on a transfer surface of the transfer die. 5. A cylindrical product with a flange comprising a cylindrical portion and a flange portion formed in a circumferential direction at an intermediate portion in the axial direction of the cylindrical portion, wherein the cylindrical portion and the flange portion are integrally formed from the same plate material. A cylindrical product with a flange characterized by being molded. 6. A cylindrical part, a flange part circumferentially formed at an intermediate part in the axial direction of the cylindrical part, and a cylindrical part having a diameter smaller than that of the cylindrical part, being continuous with an end of the cylindrical part. A flanged cylindrical product comprising a boss portion,
A cylindrical product with a flange, wherein the flange portion and the boss portion are all integrally formed from the same plate material. 7. A liquid is filled in a cylindrical work, and in this state, the opening end face of the work is covered and pressed in the axial direction. With the pressing force in the direction, the middle part in the axial direction of the work is pushed outward in the radial direction, and the pushed-out part is pressed against the transfer die arranged radially outward, and is sandwiched from the axial direction to form the flange. The cylindrical product with a flange according to claim 5 or 6, which is formed by molding. 8. The cylindrical product with a flange according to claim 5, wherein a tooth profile is formed on the flange portion.