JP2001162332A - Manufacturing method of part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a part capable of manufacturing a part having a prescribed plate thickness thicker than a thin plate material from the thin plate material at low cost, in a high yield and in a high precision. SOLUTION: A projecting part 3 having a prescribed cam shape is formed to a surface side by extruding from the rear face side of a plate material 1. A total plate thickness of the plate material 1 and the projecting part 3 is a plate thickness of a cam 10. Next, this bottom part is punched by using the punch conforming to the bottom part of a recessed part 2 of the rear side of the plate material 1, a through hole 5 is formed. Further, a desired cam is obtained by punching the shape conforming to the external shape of the projecting part 3 with a precision press. By this method, the cam 10 having a thickness thicker than the thin plate material 1 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a component such as a cam for an automobile engine, and more particularly to a method for manufacturing a component from a thin plate material capable of manufacturing a cam thicker than the plate material.

[0002]

2. Description of the Related Art Conventionally, cams used as automobile parts have been manufactured by various manufacturing methods, for example, by cutting hot or cold forged parts made of steel. There is also a method of manufacturing a cam by cold forging a thick plate material. In this case, the cam of the product has the same thickness as the material. Further, a method of manufacturing a cam by powder molding has been disclosed (Japanese Patent Application Laid-Open No. H11-50210).

[0003]

However, all the manufacturing methods have problems that the manufacturing cost is high and the yield of materials is low.

[0004] When a cam is manufactured from a forged part, there is a problem that a cam with high precision cannot be formed. Further, conventionally, when a cam is manufactured by cold forging from a thin plate material, the material is easily broken, and a droop occurs on the outer peripheral surface of the cam. Therefore, a cam-shaped member can be manufactured using the thin plate material as a material. Did not.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a method of manufacturing a component capable of manufacturing a thicker component having a predetermined thickness from a thin plate at low cost, with high yield, and with high precision. The purpose is to provide.

[0006]

According to a method of manufacturing a component according to the present invention, in a method of manufacturing a component having a hole, a recess is formed by extruding a plate with a punch having a shape matching the size of the hole. And a step of punching the bottom of the recess to form a through-hole, and a step of punching with a precision press into a shape that matches the outer shape of the projection formed by the extrusion process to obtain a component having a hole. It is characterized by having.

In the present invention, a recess is formed by extruding a plate material with a punch having a shape matching the size of the hole, and a through hole is formed by punching the bottom of the recess, and the plate is formed by extrusion. By punching a plate material by a precision press in a shape matching the outer shape of the projection, a component having a hole can be manufactured with high precision. Also, for example, thinner parts can be manufactured from thin plates,
The manufacturing cost can be reduced, and the yield of materials can be increased.

In this case, it is preferable that each of the steps is sequentially performed while feeding the plate material in one direction. Accordingly, it is not necessary to remove the plate material for each process, so that the operation can be simplified and the positioning accuracy of the plate material in each process can be improved. For this reason, the shape accuracy of the formed component can be further improved.

The parts are, for example, cams and ring-shaped parts of automobile parts.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a component according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1A to 1D are sectional views showing a method for manufacturing a component according to an embodiment of the present invention in the order of steps. FIG. 2 is a top view of the vehicle component according to the embodiment of the present invention. 3A is a front view showing a cam manufactured by the method of the present embodiment, and FIG. 3B is a longitudinal sectional view of the cam.

In the present embodiment, a method of manufacturing a cam having a finished plate thickness of 11 mm from a plate material having a plate thickness of 8 mm will be described. First, as shown in FIG. 1A, a band-shaped plate material 1 having a plate thickness T of, for example, 8 mm and a width W of 115 mm is prepared. A hole (not shown) for feeding the plate 1 in the longitudinal direction is formed in the plate 1 from an end in the plate width direction.
For example, it is formed at a position of 15.497 mm at an appropriate interval in the longitudinal direction of the plate material 1. The diameter of this hole is, for example, 12 mm. As a result, the plate 1 is continuously fed, and undergoes the following processes during the feeding.

That is, as shown in FIG. 1B, for example, a punch is pushed from the back side of the plate material 1 to form a recess 2 as viewed from the back side, and the outer shape as viewed from the front side is shown in FIG. The projection 3 having a predetermined cam shape is formed. The height t of the projection 3 from the surface of the plate 1 is, for example, 3 mm. Thereby, the total plate thickness of the plate material 1 and the protrusion 3 is 11 mm.
become.

Next, as shown in FIGS. 1 (c) and 2,
Bottom 4 of recess 2 aligned with recess 2 from the back side of plate 1
Is punched using, for example, a punch to form a through hole 5. In addition, for example, a depth of 1 to 2
A concave portion 7 of mm is formed. A plurality of protrusions 3 are formed, and a distance between the through holes 5 formed in each protrusion 3 in the length direction of the plate 1 is, for example, 48 mm. A recess 8 for positioning is formed in the through hole 5.

Next, as shown in FIG.
Is punched out from the rear surface side of the plate material 1 by a precision press or punching (fine blanking) into a shape matching the outer shape of the plate material 1 to produce a cam 10 having a desired shape.

That is, as shown in FIGS. 3 (a) and 3 (b), a plate material 1 having a thickness of 8 mm
0 can be produced. The pipe 9 is passed through the through hole 5 of the cam 10 and the pipe 9 is inserted into the through hole 5 of the cam 10.
The cam 1 is attached to the pipe 9
0 is fixed, for example, a camshaft can be manufactured.

In this embodiment, it is possible to form the cam 10 which could not be conventionally manufactured from a thin plate member. Further, since the cam 10 is formed by precision punching, the cam 10 can be formed with high shape accuracy. Further, since the cam 10 having a large thickness can be manufactured from the thin plate material 1, the manufacturing cost can be reduced and the yield of the material can be increased.
In addition, as an example of the dimensions of the cam 10 manufactured by the manufacturing method of the present embodiment, the overall length is 41.7 mm and the plate thickness is 1
1.0 mm ± 0.15 mm.

In this embodiment, the cam 10 is manufactured by sequentially performing the above-described steps on the plate 1 while transporting the plate 1 in one direction. As a result, since the plate 1 is not removed between the steps, the work becomes easy and highly efficient, and it is not necessary to position the plate 1 for each step. The positioning accuracy when forming can be increased. Thereby, the shape accuracy of the cam 10 can be further improved.

In this embodiment, the present invention is applied to the manufacture of the cam 10, but the present invention is not limited to this, and other ring-shaped parts can be manufactured.

[0019]

As described above in detail, according to the present invention, a recess is formed by extruding a plate material with a punch having a shape matching the size of a hole, and the bottom of the recess is punched to form a through hole. By forming and punching a plate material by a precision press in a shape that matches the outer shape of the protrusion formed by extrusion, a component having holes can be manufactured with high precision. Further, for example, since a thicker part can be manufactured from a thin plate, the manufacturing cost can be reduced and the yield of materials can be increased.

[Brief description of the drawings]

FIGS. 1A to 1D are cross-sectional views showing a method of manufacturing a component according to an embodiment of the present invention in the order of steps.

FIG. 2 is a top view of the vehicle component according to the embodiment of the present invention.

FIG. 3A is a front view showing a cam manufactured by the method of the present embodiment, and FIG. 3B is a longitudinal sectional view of the cam.

[Explanation of symbols]

 1; plate material 2, 7; concave portion 3; convex portion 4; part 5; through hole 8; dent 9; pipe 10; cam 11;

Claims (3)

[Claims] 1. A method of manufacturing a component having a hole, wherein a recess is formed by extruding a plate with a punch having a shape matching the size of the hole, and a through hole is formed by punching a bottom of the recess. A method for manufacturing a component, comprising: a forming step; and a step of punching out by a precision press into a shape matching the outer shape of the protrusion formed by the extrusion process to obtain a component having a hole. 2. The method according to claim 1, wherein the steps are sequentially performed while feeding the plate material in one direction. 3. The method according to claim 1, wherein the component is a cam.