JP3204331B2 - Method and apparatus for forging parts having grooves on the outer periphery of cylindrical body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for forging a part having a groove on the outer periphery of a cylindrical body.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, for example, when manufacturing a part A having a groove a on the outer peripheral portion of a cylindrical body, the part is formed by cold forging to a shape without the groove a, and is undercut. The groove a was manufactured by turning.

[0003]

However, in the groove processing by turning, there are disadvantages that productivity is poor because much time is required for processing, and the yield of material is poor because a large amount of cuttings are generated. An object of the present invention is to provide a forging method and a forging apparatus capable of manufacturing a groove of a component having a groove on an outer peripheral portion of a cylindrical body by forging.

[0004]

SUMMARY OF THE INVENTION The present invention provides the above-mentioned object.
In order to achieve this, the circumference of the cylindrical body made of a hollow material
Forging method for forming parts with grooves in one direction
And the cam urged downward by the slide knockout
Ueuchi with a die mechanism and multiple divided cavities
The mold and the lower mold urged upward by the hydraulic cylinder
Seal more and slide the upper inner mold in the radial direction by lowering the slide.
After sliding to reduce, further slide down
And the lower mold is cushioned by the hydraulic cylinder.
While lowering, the forming pan set in the lower mold
, The material is squeezed from the inside from below,
Expanding the inner peripheral surface and allowing the material to flow outward in the circumferential direction
Parts having a circumferential groove on the outer periphery of the cylindrical body.
It is a forging method for molding, and a tapered surface is provided inside.
Upper and outer molds for forming parts inside the tapered surface.
It has a cavity and is divided into a plurality
The slide is lowered by being urged downward by the knockout
Along the inner taper surface of the upper and outer mold
Tapered outer peripheral surface that contracts in the circumferential direction while sliding
Urged upward by the upper inner mold and the hydraulic cylinder
Lower mold, upper inner mold and lower mold by sliding down
While constraining both end surfaces of the hollow material with
Expanding the surface and allowing the material to flow outward in the circumferential direction.
The forming punch provided in the lower mold to release
Notch click to knock out a molded product through a lower die
An forging device comprising an out ring.

[0005]

[Operation] With the above configuration, the cylindrical material is constrained between the lower mold and the upper inner mold, and the inner diameter of the material is expanded by a forming punch. In addition to being able to mold parts with grooves in the mold, the upper mold is divided after molding, the lower mold is hydraulically cushioned, and the molded product is knocked out with a knockout ring via the lower mold, so that it can be molded from inside the mold The product can be easily taken out.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a mold apparatus for molding a part having a groove on the outer periphery of a cylindrical body. In this figure, 1 is an upper inner mold, 2 is a lower mold, and 3 is a molding punch. Show.
The outer periphery of the upper inner mold 1 is tapered such that the upper end has a small diameter, and the upper inner mold 1 can slide up and down on the tapered surface as shown in FIG. It has a T-groove cam die mechanism, is divided into three or four in the circumferential direction, and has a cavity 1a for molding a part A having a groove a in the outer peripheral part of a cylindrical body on the inner peripheral surface. ing.

The upper inner mold 1 is opened and closed while being cushioned up and down along an upper outer mold 6 fixed to a slide 9 by a punch holder 5 through a knockout mold 4 by a normal pressure type slide knockout 8 of a press. be able to. The knockout mold 4 has a hole 4a for guiding a small-diameter portion 3b for holding a material formed on the forming punch 3. The above forming punch 3
Is fixed upward to the center of the lower mold 2. A tapered portion 3a for expanding the inner diameter of the material and a small-diameter portion 3b for holding the material are formed at the upper end of the forming punch 3.

The lower mold 2 is vertically slidably mounted on a die holder 15 fixed to a bolster 19 and a forming punch 3. The bottom surface of the lower mold 2 is supported by a piston 12 via a cushion pin 11. The piston 12 is housed in a hydraulic cylinder 14 formed below the die holder 15, and is cushioned by hydraulic pressure supplied to a hydraulic chamber 13 of the hydraulic cylinder 14. A knockout ring 16 for knocking out a molded product is provided on the outer periphery of the forming punch 3, and the knockout ring 1 is knocked out by a knockout pin 20 of the press via knockout pins 18 and 17.
6 and the lower mold 2 are knocked out, and a molded product is taken out.

Next, the operation will be described. In forming the part A as shown in FIG. 3, first, a cylindrical material B or C is formed.
To produce Outer diameter φd of this material B and outer diameter φd of material C
₁ is equal to the minimum groove diameter [phi] D ₁ component A, the outer diameter of the material C phi
d ₂ is equal to the groove diameter [phi] D ₂ parts A, length _{L 1} and _{L 2} are fabricated to be 0~5mm positive than the length L of the part A. The material C can increase the degree of filling of the molded product more than the material B. Next, the material B or C is inserted into the small diameter portion 3b of the forming punch 3 in the state of the mold shown in FIG. 1, and the slide 9 is lowered from this state to start forming. Outer diameter .phi.d ₂ is inserted so as to be lower when the material C.

As shown in FIG. 4, when the slide 9 is lowered, the upper inner die 1 is lowered, and when the lower surface of the upper inner die 1 contacts the upper surface of the lower die 2, the lower inner die 2 The mold 1 cushions upward, and the upper inner mold 1 is reduced in the radial direction by the tapered chamber 7 of the upper outer mold 6. When the slide 9 is further lowered from this state as shown in FIG. 5, the lower mold 2 is lowered while receiving the cushioning action of the hydraulic cylinder 14, and the forming punch 3 squeezes the material B or C from the inside from below. Then, the material B or C is flowed into the cavity 1a of the upper inner mold 1, and the part A is formed. When the slide 9 reaches the bottom dead center, the lower mold 2 also stops cushioning. Thereafter, as the slide 9 moves up, the lower mold 2 rises as shown in FIG. Since the upper inner mold 1 releases the hydraulic pressure of the lower mold 2 and the normal-pressure slide knockout 8 causes the upper inner mold 1 to expand in the radial direction while being pushed down as shown in FIG. Then, the molded product is taken out of the upper inner mold 1. Then slide 9 rises further,
The lower die 2 is lifted through the knockout pins 18 and 17 and the knockout ring 16 by the bed knockout 20 synchronized with the slide 9 and the molded product A is knocked out as shown in FIG. Parts can be obtained.

[0011]

According to the present invention, as described in detail above, a hollow material is housed in a plurality of upper inner molds, and this material is restrained by an upper inner mold and a lower mold. By expanding the inside of the mold and flowing it into the cavity of the upper inner mold, a part having a groove on the outer periphery of the cylindrical body is molded, and the molding is performed by dividing the upper inner mold after molding The product can be easily taken out. In addition, since parts with grooves on the outer periphery of the cylindrical body can be formed by forging, productivity is improved as compared with the case of manufacturing by conventional machining, and the yield is improved because there is little waste of material. I do.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a mold apparatus according to an embodiment of the present invention.

FIG. 2A is a plan view of an upper inner mold that is divided into three parts. (B) It is a top view of the upper inner metal mold | die divided into four.

FIG. 3 is an explanatory diagram showing a dimensional relationship between a material and a molded product.

FIG. 4 is a process chart showing a molding process.

FIG. 5 is a process chart showing a molding process.

FIG. 6 is a process chart showing a molding process.

FIG. 7 is a process chart showing a molding process.

FIG. 8 is a process chart showing a molding process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Upper inner mold, 2 ... Lower mold, 3 ... Forming punch, 4 ... Knockout mold, 6 ... Upper outer mold, 7 ... Taper chamber, 8 ... Slide knockout, 9 ... Slide, 14 ... Hydraulic cylinder, 16: Knockout ring, 19: Bolster, 20
… Bed knockout, A… molded products, B, C… materials.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Kunihiko Tanaka, 5 Komatsu, Komatsu, Ishikawa, Komatsu Ltd. Komatsu Plant (72) Ryosaku Ozaki, 3-26, Kitasho-cho, Sakai-shi, Osaka Mazda (56) References JP-A-62-282740 (JP, A) JP-A-60-6238 (JP, A) JP-A-58-96837 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) B21J 13 / 02,5 / 02

Claims (2)

(57) [Claims] The present invention relates to a forging method for forming a part having a circumferential groove on the outer periphery of a cylindrical body made of a hollow material.
And the cam urged downward by the slide knockout
Ueuchi with a die mechanism and multiple divided cavities
The mold and the lower mold urged upward by the hydraulic cylinder
Seal more and slide the upper inner mold in the radial direction by lowering the slide.
After sliding to reduce, further slide down
And the lower mold is cushioned by the hydraulic cylinder.
While lowering, the forming pan set in the lower mold
, The material is squeezed from the inside from below,
Expanding the inner peripheral surface and allowing the material to flow outward in the circumferential direction
Parts having a circumferential groove on the outer periphery of the cylindrical body.
A forging method characterized by forming . Wherein in order to form a part having a groove on the outer circumference in the circumferential direction of the cylindrical body at forging method according to claim 1, therein
Upper and outer molds with a tapered surface and parts inside the tapered surface
It has a cavity for molding and is divided into multiple parts in the circumferential direction.
Cracked, urged downward by slide knockout,
As the slide descends, along the inner tapered surface of the upper and outer molds
And contract in the circumferential direction while sliding relatively upward
For upper and lower dies with tapered outer surface and hydraulic cylinder
Lower mold urged upward and slide descend
While restraining both ends of the hollow material with the upper and lower molds
The inner peripheral surface of the hollow material is extended and the material is
Molding in the lower mold to flow to the side and expand
A forging device comprising a punch and a knockout ring for knocking out a molded product via a lower mold after molding.