JPS6167537A - Forming method of outer ring with shaft of uniform universal joint, or the like - Google Patents

Abstract

PURPOSE:To simplify the process and to reduce the cost by forming a hole to which one end of a shaft base material is fitted, on a body base material, combining both of them, executing back extrusion by a forming mold, and executing simultaneously the formation of the body and a coupling of the body and the shaft. CONSTITUTION:A cup-shaped body base material 10 and a shaft base material 11 are prepared separately, and these base materials 10, 11 are brought to annealing and lubricating treatment. Subsequently, the body base material 10 is brought to forge working by a press machine, and a hole 10a to which one end of the shaft base material 11 can be fitted is formed in the center of the end face of the body base material 10. One end of the shaft base material 11 is fitted into this hole 10a, and it is inserted and attached in a forming metallic mold of the press machine. Subsequently, the body material 10 is deformed plastically by back extrusion by the press machine, a cup-shaped body part 12 is formed, and simultaneously, at the time of this back extrusion working, a fitting tip part 111 of the shaft base material 11 is expanded and elongated in the peripheral direction. In this way, the body part 12 and a shaft part 13 are coupled as one body. Subsequently, its finish forming is executed in order to raise the accuracy of an inside diameter part 12C of the body part 12.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a cup-shaped main body, such as an outer ring with a shaft or a socket wrench of a constant velocity universal joint of an automobile, and a bottom part of the cup-shaped main body. The present invention relates to a method of molding a shafted cup body having a shaft portion extending coaxially from the lower surface.

(0) Prior art and problems There is a method for forming products consisting of a cup-shaped main body and a shaft, such as the outer ring with a shaft of a constant-velocity joint in an automobile, by reducing processing costs and material costs. From the viewpoint of reducing costs, the method is one in which the body is integrally formed by plastic working using cold or hot forging (Japanese Patent Publication No. 56-39975), or the cup-shaped main body and shaft are formed separately by forging, etc. However, there is a system in which these are integrated by arc welding or friction welding (Japanese Patent Publication No. 56-49193).

Fig. 7 shows a conventional method of integrally forming a product by plastic working, in which a columnar material 1 shown in Fig. 7 (al) is annealed and lubricated, and then forward extrusion processing is performed.
As shown in b), an intermediate product 2 having a shaft portion 2a is molded. Next, hit the head 2b with the heading tool and
As shown in Figure (C1), the outer diameter of the material is expanded in a disk shape,
Furthermore, after annealing this intermediate molded product 3 to remove internal stress and subjecting it to a moistening treatment, this is subjected to cold backward extrusion processing to form a cup-shaped main body portion 4a.
As shown in Figure (di), an intermediate molded product 4 that closely resembles a product having a main body portion 4a and a shaft portion 4b is made.Next, in normal cases, in order to improve the accuracy of the inner diameter portion 5C of the main body portion 4a, finish molding is performed. A product 5 shown in FIG. 7 was obtained. FIG. 8 is a plan view of the product 5.

However, the conventional forming method described above requires a forward extrusion process to form the shaft, and also requires a press machine with a relatively long knockout stroke, and the knockout specification of the press machine is This is determined by the shaft portion formed by forward extrusion, and if the shaft portion is particularly long, forward extrusion processing using a press machine is impossible.

In addition, intermediate annealing and /II smoothing treatment are essential before the backward extrusion process when forming the cup-shaped main body.
Moreover, the cost of these treatments accounts for a relatively large proportion of the total manufacturing cost of products by forging. Furthermore, since it is necessary to perform heading processing on the intermediate product after forward extrusion of the material, a special press machine is required for this purpose, and the energy required to form the product increases accordingly, resulting in low productivity and high costs. There was a problem with high prices.

In addition, conventional methods for separately molding and joining the cup-shaped main body and shaft part employ brazing, bolting, or plastic joining by local material deformation.
Such a method requires a step of joining the parts after the molding process, and also requires extra processing and high processing precision between the joined parts, resulting in high costs.

(c) Purpose of the Invention The present invention was made to solve the conventional problems as described above, and its purpose is to simplify and reduce the molding process and to improve the productivity of molded products. improve,
It is also an object of the present invention to provide a method for molding an outer ring with a shaft of a constant velocity swivel arm, etc., which is designed to reduce costs.

Structure of the Invention In order to achieve the above-mentioned object, a method for forming an outer ring with a shaft of a constant velocity universal joint, etc. of the present invention comprises a cup-shaped main body material for forming an outer ring with a shaft, etc. of a constant velocity universal joint, and a shaft. After molding the part materials separately and annealing and lubricating this image material as necessary,
forming a hole in the cup-shaped main body material into which one end of the shaft material fits, and supplying the cup-shaped main body material and the shaft material in a combined state to a mold through the hole; The cup-shaped main body is formed by backward extrusion, and at the same time, the cup-shaped main body and the shaft are integrally joined.

(E) Embodiments of the Invention An example of a method for forming a shafted outer ring, etc. of a constant velocity universal joint according to the present invention will be described below with reference to FIG.

FIGS. 1(a) to 1(dl) show the process order of the molding method of the present invention, and the outer ring with a shaft of the constant velocity universal joint, etc. is molded by the following procedure.

(1) First, as shown in FIG. 1(a), a cup-shaped main body material 10 and a shaft material 11 are required for the shape of the molded product.
are prepared separately, and these materials 10 and 11 are subjected to annealing treatment.

(2) Next, the body part material 10 subjected to the annealing and lubrication treatment is put through a press machine and forged to form a hole 10a into which one end of the shaft material 11 can fit into the end surface of the body part material 10, as shown in FIG. Form in the center.

(3) Next, as shown in Figure 1 (C1),
One end of the shaft material 11 is fitted into the hole 10a, and this is inserted into a mold of a press machine (not shown).

(4) Next, the main body material 10 is plastically deformed by backward extrusion using a press machine to form a cup-shaped main body 12 (the first
At the same time as forming the figure (see dl), the fitting end portion 11 of the shaft material 11 is formed during this backward extrusion process. Figure 1 (dl
As shown in FIG. , performs finishing molding (not shown).

Figure 2 (al, (bl) is for explaining the state of deformation of the tissue at the bottom of the cup-shaped main body 12. The materials 10 and 11 combined with each other are cross-sectioned in a plane including their central axis. Considering the case where a lattice pattern as shown in Figure 2 (al) is drawn on this cross section, the lattice pattern after backward extrusion becomes as shown in Figure 2 (bl), and the deformation of the pattern is It becomes larger at the bottom 12a of the shaped body part 12 and the rising part 12b connected thereto.This means that the enlarged flow deformation of the tip of the shaft material 11 fitted in the cup-shaped material hole 10a for the main body part is large. This means that the cup-shaped main body part 12 and the shaft part 1 after molding are larger.
The bonding strength with No. 3 will be increased.

In addition, since precision between the hole and the shaft is not required, for example, even if there is a gap between the two members, the gap will completely disappear due to the molding pressure during molding of the inner diameter part 12c of the cup-shaped main body 12.
The union between the two will be complete.

In this embodiment as described above, the material for forming the outer ring with a shaft of the constant velocity universal joint is composed of two parts, the cup-shaped main body part and the shaft part, and the material part for the cup-shaped main body part is attached to the rear. Since the extrusion method is used, the knockout operation length required for the molding press machine is reduced, which is particularly advantageous during automatic conveyance.

In addition, the conventional process of forming an intermediate product by subjecting it to a heading process is no longer necessary, and cup forming can be performed without performing another annealing process.
The number of molding steps is reduced, productivity is increased, and product costs can be reduced.

Fig. 3 shows a modification of the coupling method of the cup-shaped main body and the shaft material forming the outer ring with the shaft of the constant velocity universal joint of the present invention. A step 11a is formed at one end of the processed shaft material 11 as shown in FIG. 10b and the inclined portion 10c.Then, the cup-shaped main body material (intermediate product) 10 and the shaft material 11 are combined as shown in FIG. d
An outer ring with a shaft of a constant velocity universal joint having a shaft portion 13 having a coupling configuration as shown in i is formed. The subsequent finishing molding is the same as in the first embodiment.

Fig. 4 shows still another modification of the coupling method of the cup-shaped main body and the shaft material forming the outer ring with the shaft of the constant velocity universal joint of the present invention, as shown in Fig. 4 (al). A through hole 10d and an inclined portion toe are formed in the axial center of the cup-shaped main body material 10 processed into a predetermined shape, as shown in FIG. After that, the cup-shaped main body material 10 and the shaft material 11 are combined as shown in FIG. It is possible to mold an outer ring with a shaft of a constant velocity universal joint having a shaft portion 13 having a coupling structure as shown in FIG.

The subsequent finishing molding is the same as in the first embodiment.

Note that the product to which the method of the present invention described above is applied includes a socket wrench 20 as shown in FIG. 5 and an internal gear 21a as shown in FIG. 6, in addition to the outer ring with the shaft of the constant velocity universal joint. There is a gear with a shaft 21, etc.

Further, depending on the molded product, the annealing treatment of the inner diameter portion 12c of the cup-shaped main body portion 12 before molding may be omitted. moreover,
Holes in the cup-shaped main body material into which the shaft material is fitted may be formed by cutting with a drill or the like. Furthermore, it is also possible to use different materials for the cup-shaped main body material and the shaft material.

Furthermore, in order to increase the bonding strength, it is effective not to apply lubrication to the hole in the plastic body material and the fitting surface of the shaft end that fits into the hole.

(F) As described in detail, according to the present invention, the cup-shaped main body material and the shaft material for forming the outer ring with a shaft of the constant velocity universal joint, etc. are formed separately, and the cup-shaped main body part A hole is formed in the material for the shaft into which one end of the shaft material is fitted, and then the shaft material and the material for the cup-shaped main body are combined through the hole and placed in a mold, and the cup-shaped main body is formed by backward extrusion. Since the cup-shaped main body and the shaft are connected at the same time, the molding process can be simplified and reduced, and the productivity of the molded product can be improved and costs can be reduced.

[Brief explanation of the drawing]

Figures 1 (a) to (dl are explanatory views showing the steps of the method of the present invention, Figures 2 (al) and (bl) are explanatory views showing the deformed state of the molded product in the present invention, and Figures 3 (al to (di 4 is a process explanatory diagram showing a modification of the method of the present invention; FIG. 4 is a process explanatory diagram showing another modification of the method of the present invention; FIGS. FIG. 7 is an explanatory diagram showing an example of application to a product, FIG. 7 is an explanatory diagram showing the process of a conventional method, and FIG. 8 is a plan view of FIG. 7. 10... Cup-shaped main body material, 10a . lQb, IOC"' hole, 11...shaft material, 11a, t
ib...Step part, 12...Cup-shaped main body part, 13.
・Shaft part. Figure 1 Figure 2 (b)

Claims (1)

[Claims] The material for the cup-shaped main body part and the material for the shaft part, which are used to form the outer ring with a shaft of the constant velocity universal joint, etc., are separately molded, and after annealing and lubricating this image material as necessary, the material for the cup-shaped main body part is molded separately. A hole is formed in the material into which one end of the shaft material fits, and the cup-shaped main body material and shaft material are supplied into a mold in a combined state through this hole, and are extruded backward to form a cup. A method for molding an outer ring with a shaft of a constant velocity universal joint, etc., comprising molding a cup-shaped main body and simultaneously joining the cup-shaped main body and a shaft.