JPH03258436A - Molding method by forge joining - Google Patents

Abstract

PURPOSE:To integrally forge-join a part to be joined and a part to be forged by exact positioning by supporting the former part by means of a sliding die inserted with a spring and plastically deforming the latter part reset around this part by the pressure of molding. CONSTITUTION:The part p1 to be joined is positioned and set to the die 1 of the die consisting of a die 1 and a punch 2 by utilizing a relief part. The part p2 to be forged is set on the outer periphery of this part p1. The rear surfaces of the these parts p1, p2 are set in the positions deviated by t in an axial line direction. The punch 2 is then lowered and the part p1 is pressed to the die 1 and is held in this position via the slide die 3 by the compressive force of the spring 4. Further, the punch 2 is lowered to press the part p2. The part p2 is plastically fluidized to the outer edge of the part p1 in this way, by which both are integrally joined.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of integrally forming a plurality of members into a mechanical component having a desired shape by forging and joining.

[Conventional technology]

Conventionally, gears have been manufactured using methods such as integral forging, sintering, and punching from sheet metal, but for parts that require strength, such as automobile transmission gears, forging is used. - Body shaping has become mainstream.

Problems with forming by forging include the following points.

b) Restrictions include the capacity of the press used for forging, the flow of the material, etc., and there are restrictions on thinning the wall and stealing the material in areas where strength is not required.

Since the overall material is determined based on the parts that require the most strength, high-quality materials are also used in parts that do not require strength, which increases costs.

C. Even if the required material quality differs depending on the part, they cannot be molded at the same time, so they must be joined separately by welding or the like in a subsequent process.

As a countermeasure to these problems,
As shown in FIG. 4, Publication No. 2 discloses that a pressed part S formed by punching from a sheet metal and a part S2 previously formed into a hollow cylindrical shape are set in a lower mold 21, and an upper mold having a conical protrusion 23 is set. This document describes a method for manufacturing an upper sheet S of an intake and exhaust valve, which is pressed at 22, forged part s2, and joined to part s at the same time.

Furthermore, as shown in FIG. 5, in Japanese Patent Application Laid-Open No. 62-16838, a nail U is fitted into a part V having a recessed portion for receiving the head thereof and set in a lower mold 31, and then the upper mold 32 A method for manufacturing a stud for shoes is described in which a washer W is formed by forging a component (2), and at the same time the head of a nail U is wrapped around and joined.

(Problems to be Solved by the Invention) The forging joining method shown in FIG. 4 allows forging joining of two parts of different materials. However, since the part s2 is supported by the manufactured part s2 or the press part S, and the part s2 is joined by plastic flow to the entire one side of the part s during forging, the upper seat S of the intake and exhaust valve is It is limited to the molding of special shaped products such as

In addition, in the forging joining method shown in FIG. 5, the part U is positioned by the lowering upper mold 32 in a direction perpendicular to the descending direction of the upper mold, or the part U or V to be forged is positioned. Since part V, which is directly supported and is a support body, undergoes plastic deformation during forging joining, the positioning of part U in the direction of descent of the upper mold becomes unstable, and the relative position of washer W and nail U of the formed shoe stud is unstable. Be accurate.

Furthermore, the above-mentioned forging joints are all limited to forging two parts, and it is virtually impossible to forge joining three or more parts.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned conventional problems, accurately position parts to be forged and joined, and provide a forming method that enables forging and joining of three or more parts. .

[Means and effects for solving the problem] The present invention provides a forged part that supports a to-be-welded part with a slide mold with a spring installed in at least one of the upper mold or the lower mold, and that is set around the slide mold. This is a forming method using forging joining, in which the parts are plastically deformed under forming pressure and integrally joined to the parts to be joined.

The parts to be welded set in the die are supported by a slide die, and when forming pressure is applied to the forged part, the parts to be welded are held in position by the slide die loaded with spring pressure, and the parts are moved around the slide die. The parts to be forged are plastically deformed and joined together.

(Example) Examples of the present invention will be described below.

FIG. 1 shows an embodiment of the present invention in cross section, showing a state in which molded parts are set to the left of the center line and a state in which they are forged and joined to the right of the center line.

FIG. 2 is a cross-sectional view showing the parts to be molded and the gears joined by forging.

In Fig. 1, the molds include a fixed lower mold l and a movable upper mold 2.
The slide mold 3 is installed on the upper mold 2 via a slide mold 3 or a spring 4.

The parts for forming the forged and joined gear P shown in FIG. 2(C) are a part P forming a boss part and a rib part in which a hollow part q is formed in advance as shown in FIG. 2(A), and a part P forming a rib part. Hollow cylindrical part P2 of the peripheral part that forms the tooth shape afterward as shown in Fig. 2 (B)
It is made up of parts, and the materials of these parts can be selected as appropriate.

As shown to the left of the center line in FIG. 1, the part P1 to be forged and joined is positioned and set in the lower die 1 using the thinned part q, and the part P2 to be deformed by forging is attached to the outer periphery of the part P.
Set. In this case, the lower surfaces of parts p and P2 are shifted by t in the axial direction.

When the upper die 2 is lowered, the slide die 3 comes into contact with the part p, and presses the part p against the lower die l while compressing the spring 4 to maintain that position, and then the upper die 2 or the part p2 Press
As shown to the right of the center line in FIG. 1, plastic flow occurs to the outer edge of one part p2 or the positioned part p, and the two are integrally joined.

In this forging process, mainly only the part Pt undergoes plastic flow, so a large press machine is not required since the forging part is smaller than when the car P is forged in one piece.

FIG. 3 shows another embodiment of the invention.

The molded product in this case is a gear made of two plates shown in FIG. It is a molded product consisting of four parts connected by two plate materials r 3 r r 4. Rib portion r3, r.

A hollow part r5 is formed between them.

A state in which these molded parts are set to the left of the center line in FIG. 3(A) is shown.

As shown in FIG. 3(A), the mold is composed of a fixed lower mold 11 and a movable upper mold 12, and a slide mold 13 is installed on the lower mold 11 via a spring 14.

As shown to the left of the center line in FIG. 3(A), the boss part r,
A stepped portion is formed in and the two plate materials r:l+r4 are held between them and the inner peripheral surface of the part r2, and these parts are set in the lower mold 1]. At this time, the lower surface of the plate material r4 is supported by the slide die 13.

When the upper die 12 is lowered, the upper die 12 becomes the boss part r.

and comes into contact with part r2 to plastically deform them.

At this time, since the plate material r4 is not supported by the slide die 13, its spring 14 is compressed and the plate material r4 is lowered, and its position in the descending direction of the upper die 12 is determined, and it is positioned to the right of the center line in FIG. 3(A). As shown, there are boss parts r on the inner and outer peripheries of the plate material 'ff+r4
1 and part r2 are joined together by plastic flow, and a lightweight and strong gear material with a hollow rib portion is formed.

In this example, we have shown a method for forming a gear made of four parts with the rib part made of two plates, but it is of course applicable to a method of forming a gear made of three parts with the rib part made of one plate. It is.

In the above embodiments, the method of forming a gear consisting of two to four parts was shown, or the main shaft countershaft,
It can also be applied to the molding of flanged shafts such as axle shafts, and materials or preform materials made by forging, casting, punching, etc. can be used as appropriate for each part.

(Effects of the Invention) The present invention has the advantage that it is possible to accurately position parts to be forged and joined, and that three or more parts can be integrally formed by forging and joining.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the molding method of the present invention, FIG. 2 is a cross-sectional view showing parts to be molded and gears joined by forging, and FIG. 3 is a cross-sectional view of another embodiment of the present invention. FIGS. 4 and 5 are cross-sectional views showing conventional forge joining methods, respectively. 1.11: Lower mold 2.12: Upper mold 3.13 Varnish light mold P, R: Molded gear P+, P2: Parts r, ~r4: Parts 4.14: Spring Fig. 1 Fig. 2

Claims (1)

[Claims] The to-be-joined parts are supported by a slide mold with a spring installed in at least one of the upper mold or the lower mold, and the forged parts set around the slide mold are plastically deformed by the pressure of forming and integrated with the said to-be-welded parts. A forming method using forging joining, which is characterized by joining.