JPH04143038A - Manufacture of outer ring of constant velocity joint - Google Patents

Abstract

PURPOSE:To manufacture the above outer ring excellent in concentricity as surely securing the concentricity of the spline part of the axial part of the outer ring by inserting an restraining die for the outer shape of an axial part into a preliminary axial part to restrain the outer peripheral surface of the preliminary axial part. CONSTITUTION:A preliminary cup part 8 of the outer wheel stock 3 is fitted to the upper end part of the punch 14 for the cup and supported and the upper die 13 is lowered with a die 15, etc. In this case, the preliminary cup part 8 is ironed between the die 15 and the punch 14 for the cup and deformed plastically after the outer shape of the punch 14 to form the cup part 4. Then, a retaining die 16 is fitted to the outer periphery of a preliminary axial part 9 through the total periphery and the total length, the outer peripheral surface of the preliminary axial part 9 is restrained by the restraining die 16 and the concentricity of the punch 17 for the spline to the preliminary axial part 9 is secured. The tip part of the punch 17 for the spline is inserted into a working hole 11 of the preliminary axial part 9, the spline part 7 is formed on the inner peripheral surface of the working hole 11 and an axial part 5 is formed from the preliminary axial part 9.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method of manufacturing an outer ring of a constant velocity joint.

(Prior art) The outer ring of a constant velocity joint has a cup portion in which a plurality of track grooves are formed on the inner circumferential surface at intervals in the circumferential direction, and track grooves extending concentrically outward from the bottom of the cup portion. It is generally known to have an extended hollow shaft portion and a spline portion formed on the inner circumferential surface.

The following methods are known as methods for manufacturing this type of outer ring.

That is, first, an outer ring material having a substantially similar shape to the outer ring is formed from a material billet through upsetting molding, extrusion molding, etc. In this case, a preliminary track groove having a substantially similar shape to the track groove is formed on the inner peripheral surface of a preliminary cup portion corresponding to the cup portion of the outer ring material, and a preliminary track groove corresponding to the shaft portion of the outer race material is formed. A machined hole for forming the spline portion is drilled in the preliminary shaft portion.

Next, the preliminary cup part of the outer ring material is fitted concentrically into the tip of a punch for forming the inner peripheral surface of the cup part to support the outer ring material on the punch, and in this state, the ironing die is inserted into the cup of the outer ring material. The preliminary cup part is squeezed between the punch and the die by fitting the preliminary cup part concentrically onto the punch and moving the cup part toward the base part, thereby forming the cup part.

In parallel with this, a punch for forming the spline portion is fitted concentrically into a machined hole in the spare shaft portion of the outer ring material to form the spline portion on the inner peripheral surface of the machined hole, thereby forming the spline portion on the inner circumferential surface of the machined hole. Manufacture.

In this case, in this manufacturing method, the punch for forming the inner peripheral surface of the cup portion is provided in the lower mold of the mold device, the ironing die and the punch for forming the spline portion are provided in the upper mold of the cough mold device, and the punch for forming the inner peripheral surface of the cup portion is provided in the upper mold of the cough mold device. In one stroke, the outer ring is formed from the outer ring material.

However, in this manufacturing method, especially when forming the spline part, when the spline part forming punch is inserted into the machined hole of the spare shaft part of the outer ring material, the coaxiality of both parts must not be ensured. The end portion of the preliminary shaft portion often partially expands outwards, resulting in an inconvenience in that the spline portion of the molded shaft portion is misaligned.

(Problem to be Solved) The present invention eliminates such inconvenience, and includes a cup portion in which a plurality of track grooves are formed on the inner peripheral surface at intervals in the circumferential direction;
When manufacturing an outer ring of a constant velocity joint consisting of a hollow shaft part extending concentrically outward from the bottom of the cup part and having a spline part formed on the inner circumferential surface, it is particularly important to It is an object of the present invention to provide a manufacturing method that can reliably and sensitively ensure the coaxiality of a spline portion of a spline.

(Means for Solving the Problems) In order to achieve the above object, the method for manufacturing an outer ring of a constant velocity joint of the present invention has a cup portion in which a plurality of track grooves are formed on the inner circumferential surface at intervals in the circumferential direction. and a hollow shaft portion extending concentrically outward from the bottom of the cup portion and having a spline portion formed on the inner circumferential surface. a spare cup part and a spare shaft part corresponding to the part and the shaft part, respectively, a spare track groove having a shape substantially cooperating with the track groove is formed on the inner circumferential surface of the spare cup part, and a spare track groove having a shape substantially cooperating with the track groove; a step of manufacturing an outer ring material having machined holes drilled concentrically; a step of supporting the outer ring material on the punch by concentrically inserting a preliminary cup portion of the outer ring material into a punch for forming the inner peripheral surface of the cup portion; After the support, the ironing die is fitted concentrically to the preliminary cup portion of the outer ring material and moved toward the base of the punch for forming the inner peripheral surface of the cup portion, and at this time, the preliminary cup portion of the outer ring material is A step of forming the cup portion by squeezing between a die and the punch, and a step of inserting a shaft outer diameter restraining die onto the outer periphery of the preliminary shaft portion of the outer ring material over its entire length in parallel with the forming. and, after the fitting, a punch for forming the spline part is inserted concentrically into the machined hole of the preliminary shaft part, and at this time, the spline part is formed on the inner peripheral surface of the machined hole by the punch. It is characterized by

(Function) According to this means, when the cup portion of the outer ring is formed by squeezing the preliminary cup portion of the outer ring material between the punch for forming the inner peripheral surface of the cup portion and the ironing die, this In parallel with this, the shaft outer diameter restraining die is fitted onto the outer periphery of the spare shaft portion of the outer ring material over its entire length,
In this state, the spline portion is formed by inserting the spline portion forming punch into the machined hole of the preliminary shaft portion, thereby manufacturing the outer ring.

At this time, especially when forming the spline part, the outer periphery of the spare shaft part of the outer ring material is restrained over the entire length by the shaft outer diameter restraining die, so that the end of the spare shaft part is directed outward. The spline portion is formed without expanding.

(Example) An example of a method for manufacturing an outer ring of a constant velocity joint of the present invention will be described with reference to FIGS. 1 to 3. Figure 1 is a process explanatory diagram of the manufacturing method, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 (a).
-(e) are process explanatory diagrams of main parts of the manufacturing method.

1 and 2, 1 is an outer ring of a constant velocity joint to be manufactured by applying the present invention, 2 is a material billet that is the raw material for the outer ring 1, and 3 is an outer ring 1 manufactured from the material billet 2. This is the outer ring material manufactured in the process.

The outer ring 1 consists of a cup part 4 and a hollow shaft part 5 extending concentrically outward from the bottom of the cup part 4. The inner peripheral surface of the cup part 4 has a plurality of stripes extending from its open end to the bottom. track grooves 6 are formed at equal intervals in the circumferential direction, and a spline portion 7 is formed on the inner circumferential surface of the shaft portion 5.

In FIG. 1, when manufacturing an outer ring 1, first, an outer ring material 3 is formed from a billet material 2 through upsetting molding, extrusion molding, etc.
Manufacture.

In this case, in the outer ring material 3, the cup portion 4 of the outer ring 1
A spare cup part 8 and a spare shaft part 9 are formed corresponding to the shaft part 5, and these are formed in a shape that is substantially the same as the outer ring 1. More specifically, the preliminary cup portion 8 is formed to have a thicker wall than the cup portion 4 of the outer ring 1, a shorter length in the axial direction, and a slightly larger inner diameter. Ru. Further, on the inner peripheral surface of the preliminary cup portion 8, a preliminary track groove 10 having a substantially complementary shape to the track groove 6 of the outer ring 1 is provided.
is formed. Further, a machined hole 11 for forming the spline portion 7 is formed in the axial center portion of the preliminary shaft portion 9.

After the ironing process, the preliminary round 8 of the outer ring material 3 is ironed to form the cup part 4, and the inner circumferential surface of the machined hole 11 of the preliminary shaft part 9 is formed by ironing, as will be described in detail later. The spline portion 7 is formed by punching, thereby obtaining the desired outer ring 1.

Next, a method for manufacturing the outer ring 1 from the outer ring material 3 will be explained in detail with reference to FIGS. 3(a) to 3(e).

In FIG. 3(a), 12 is a lower mold, 13 is an upper mold, and the lower mold 12 has a punch 14 for forming the inner peripheral surface of the cup portion (hereinafter simply referred to as the cup punch 14), and the upper mold The mold 13 includes an ironing die 15 (hereinafter simply referred to as the die 15), a shaft outer diameter restraining die 16 (hereinafter simply referred to as the restraining die 16), and a spline forming punch 17 (hereinafter simply referred to as the spline punch 17). ) is installed.

The die 15 is fixed to the lower end of an arm 18 vertically disposed on the upper mold 13 so as to be concentric with the cup punch 14 , and the spline punch 17 is attached to the upper mold 13 above the die 15 with the cup punch 14 . They are vertically installed concentrically. A spline forming portion 19 for forming the spline portion 7 of the shaft portion 5 is formed on the outer peripheral surface of the tip of the spline punch 17. The restraint die 16 is inserted concentrically into the body of the spline punch 17 so as to be freely raised and extended, and its upper end is connected to a locking body 20 fixed to the upper die 13 via a jaw 21. It is locked and further urged downward by a spring 22.

The outer ring 1 is formed by the cup punch 14 and the die 15.
The outer ring material 3 is formed as follows.

That is, when forming the outer ring 1 from the outer ring material 3, the preliminary cup portion 8 of the outer ring material 3 is first fitted and supported by the upper end of the cup punch 14, as shown in FIG. In this state, the upper mold 13 is lowered together with the die 15 and the like.

At the time of lowering, first, as shown in FIG. 3(b), the die 15 is lowered while being externally fitted concentrically with the preliminary cup part 8, and at this time, the preliminary cup part 8 is lowered between the die 15 and the cup. It is squeezed between the punch 14 and deformed according to the outer surface shape of the punch 14, whereby the cup portion 4 is formed from the preliminary cup portion 8.

Next, as shown in FIG. 3(C), the restraining die 16 is fitted over the entire circumference and length of the preliminary shaft portion 9, so that the outer circumferential surface of the preliminary shaft portion 9 is held by the restraining die 16. While being restrained, coaxiality between the spline punch 17 and the preliminary shaft portion 9 is ensured.

Then, in this state, as shown in FIG. 3(d), the tip of the spline punch 17 is fitted into the machined hole 11 of the preliminary shaft portion 9, and at this time, the spline of the spline punch 17 is inserted. The spline portion 7 is formed on the inner peripheral surface of the machined hole 11 by the forming portion 19, and thereby the shaft portion 5 is formed from the preliminary shaft portion 9.

In this case, since the outer circumferential surface of the preliminary shaft portion 9 is restrained by the restraining die 16, the tip of the spline punch 17 can be inserted into the machined hole without partially pushing out the end of the preliminary shaft portion 9. Therefore, the coaxiality of the spline portion 7 is ensured.

After this, as shown in FIG. 3(e), the upper mold 13 is raised and the spline punch 17 etc. are removed from the outer ring 1, while a stripper (not shown) provided on the upper mold 13 removes the outer ring. 1 is removed from the cup punch 14.

(Effects) As is clear from the above description, according to the method for manufacturing the outer ring of a constant velocity joint of the present invention, the spline portion is formed by inserting a punch for forming the spline portion into the machined hole of the spare shaft portion of the outer ring material. By inserting a shaft external shape restraining die into the spare shaft and restraining the outer circumferential surface of the spare shaft, the coaxiality of the spline portion of the shaft of the outer ring can be ensured. This makes it possible to manufacture an outer ring with excellent coaxiality.

[Brief explanation of drawings]

Fig. 1 is a process explanatory diagram of an example of the method for manufacturing an outer ring of a constant velocity joint of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 (
a) to (e) are process explanatory diagrams of main parts of the manufacturing method. 1...Outer ring 3...Outer ring material 4...
Cup part 5...Shaft part 6...Track groove
7...Spline part 8...Spare cup part
9... Spare shaft portion 10... Spare track groove 11
... Machining hole 14 ... Punch 1 for forming the inner peripheral surface of the cup part
5... Die for ironing 16... Shaft outer diameter restraining die 17... Bunch for forming spline part

Claims (1)

[Claims] 1. A cup part in which a plurality of track grooves are formed at intervals in the circumferential direction on the inner circumferential surface, and a spline part extending concentrically outward from the bottom of the cup part, and a spline part on the inner circumferential surface. A method for manufacturing an outer ring of a constant velocity joint comprising a formed hollow shaft part, the method comprising a spare cup part and a spare shaft part corresponding to the cup part and the shaft part, respectively, and an inner ring of the spare cup part. A step of manufacturing an outer ring material in which a preliminary track groove having a shape substantially similar to the track groove is formed on the circumferential surface and a machined hole is drilled concentrically in the preliminary shaft portion, and a punch for forming the inner circumferential surface of the cup portion. A step of concentrically fitting a spare cup portion of the outer ring material to support the outer ring material on the punch, and after the supporting, fitting an ironing die concentrically into the preliminary cup portion of the outer ring material while inserting the outer ring material into the inner periphery of the cup portion. moving toward the base of the surface forming punch, and at this time, squeezing the preliminary cup portion of the outer ring material between the die and the punch to form the cup portion, and in parallel with the forming. A step of inserting a shaft outer diameter restraining die onto the outer periphery of the spare shaft portion of the outer ring material along its entire length, and after the fitting, inserting a punch for forming the spline portion concentrically into the machined hole of the preliminary shaft portion. and forming the spline portion on the inner circumferential surface of the machined hole using the punch.