JP2633770B2 - Manufacturing method and apparatus for outer ring of constant velocity joint - 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 manufacturing an outer race of a constant velocity joint in which a cup and a shaft are integrally provided.

[0002]

2. Description of the Related Art Usually, an outer race of a constant velocity joint has a cup portion having an inner peripheral surface formed with a track groove extending in an axial direction, and a spline portion extending in an inner peripheral surface in an axial direction. There has been known one integrally formed with a shaft portion.

When manufacturing this kind of outer ring, first, an outer ring material having a substantially similar shape to the outer ring is formed from a material billet by extrusion molding or upsetting, and then a cup portion is formed via a punch and a die. On the other hand, in parallel with this, a method of forming a spline portion on the inner peripheral surface of a processing hole of a shaft portion by a spline forming punch is generally performed.

[0004]

However, in the above-mentioned prior art, when the spline forming punch is inserted into the machined hole of the shaft, the machined hole receives a compressive force in the axial direction so that the seat is seated in the axial direction. There is a possibility that a spline with satisfactory accuracy may not be obtained because the molding is performed in a state where bending (flexure) deformation or the like is caused. Therefore, since the material hole is required to have a material shape in which the thickness between the inner diameter and the outer diameter is sufficiently ensured, problems such as an increase in the lace allowance after molding have been pointed out.

The present invention solves this kind of problem, and can effectively prevent an increase in cutting allowance or the like at the spline outer diameter portion of the shaft portion, and furthermore, achieves a spline portion that is entirely uniform. An object of the present invention is to provide a method and an apparatus for manufacturing an outer race of a constant velocity joint which can be easily and efficiently formed.

[0006]

[0007]

In order to achieve the above object, a method of manufacturing an outer race of a constant velocity joint according to the present invention is directed to a cup portion having an inner peripheral surface having a track groove extending in an axial direction. A method of manufacturing an outer race of a constant velocity joint integrally comprising a shaft portion having a spline portion extending in an axial direction on an inner peripheral surface thereof, wherein a cutting edge portion is provided at a tip portion. Supra
The diameter of the punch for in-molding is equal to or greater than the diameter of the punch.
Inserted into the shaft portion which is formed on, for the spline molding
With the punch inserted into the shaft,
Relative to the ironing die of the outer diameter of the shaft
The inner peripheral surface of the part is the cutting edge at the tip of the spline forming punch
The shaft portion is plastically deformed so as to bite into the position, the
The cutting edge part at the tip part of the spline forming punch and the shaft part
Outer diameter ironing die is constrained in the direction to separate from the shaft
Synchronous movement while maintaining the state, on the inner peripheral surface of the shaft
The spline portion is formed by molding .

Further, the manufacture of the outer race of the constant velocity joint according to the present invention.
The apparatus comprises: a cup portion having a track groove formed in an inner peripheral surface thereof extending in an axial direction; and a shaft portion having a spline portion formed in an inner peripheral surface having an axially extending spline portion. An apparatus for manufacturing an outer race of a joint, wherein a tip portion is provided on the shaft portion.
The diameter of the opening of the shaft portion is smaller than the opening diameter of the formed hole.
Form a spline on the inner peripheral surface of the shaft that is shorter than the depth of the part
And coaxial with the cutting edge portion.
And has a rod portion smaller in diameter than the cutting blade portion.
A spline forming punch and the spline forming pan
With the switch inserted in the shaft, the shaft is
Pressing deformation corresponding to the external shape of the line forming punch
And when the spline is removed from the shaft,
The spline moves on the inner peripheral surface of the shaft by
An outer diameter ironing die for forming a shaft, and the spline forming die.
The shape punch and the ironing die with the outer diameter of the shaft
And a first and a second stopper that are supported so as to be movable forward and backward .

[0009]

According to the method and the apparatus for manufacturing the outer race of the constant velocity joint according to the present invention, the spline forming punch is inserted into the shaft of the outer race. When the ironing die is relatively moved, the shaft is pressed and deformed in accordance with the outer shape of the spline forming punch. Therefore, since the rod portion of the spline forming punch is surrounded by the inner peripheral surface of the shaft portion, the spline forming punch and the shaft portion outer diameter ironing die move in a direction separating from the shaft portion synchronously. Then, a spline portion is formed in a portion surrounding the rod portion. This prevents the spline portion from being axially displaced, and prevents a locally thick portion from being generated at the bottom portion of the shaft portion, and also forms a uniform spline portion as a whole.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method and an apparatus for manufacturing an outer race of a constant velocity joint according to the present invention will be described with reference to the accompanying drawings.

In FIGS. 1 to 5, reference numeral 10 denotes
1 shows an apparatus for manufacturing an outer race of a constant velocity joint according to the present embodiment. The manufacturing apparatus 10 includes a cup portion 14 having a track groove 12 formed in an inner peripheral surface thereof by processing the spare cup portion 4 and the spare shaft portion 6 provided on the outer race material 2 and extending along an inner circumferential surface. An outer ring 20 is integrally formed with a shaft portion 18 having a spline portion 16 extending in the axial direction on a surface.

The manufacturing apparatus 10 includes a lower die 22 and an upper die 24 that can be moved up and down. A punch 26 for forming a track groove is supported by the lower die 22 in the vertical direction. The cross-sectional shape of the track groove forming punch 26 corresponds to the track groove 12 of the cup portion 14, and is formed on the inner peripheral surface of the cup portion 14 so as to be equally spaced circumferentially and extend in the axial direction. Article,
For example, three track grooves 12 are formed.

The upper mold 24 is provided with a spare cup portion 4 of the outer race material 2.
And a spline forming punch 30 having a diameter (described later) smaller than the opening diameter D1 of the hole 6a provided in the spare shaft portion 6 of the outer race material 2.
A shaft portion outer diameter ironing die 32 for pressing the outer peripheral surface of the preliminary shaft portion 6 when descending, and the spline forming punch 30
And a first and second stopper portions 34 and 36 for supporting the shaft outer diameter ironing die 32 with respect to the auxiliary shaft portion 6 so as to be able to advance and retreat by substantially the same distance L. Ironing surfaces 28a and 32a having tapered portions are provided on the inner peripheral surfaces of the die 28 and the shaft outer diameter ironing die 32, respectively.

An arm 38 is supported on the upper mold 24 in a vertically downward direction, and a substantially cylindrical support member 40 is provided in the arm 38. A ring-shaped first stopper portion 3 protruding radially inward on the inner peripheral surface of the support member 40.
4 is provided above the first stopper portion 34.
An opening 42 is formed. A second opening 44 is formed below the first stopper 34 via a step, and
The second stopper 36 projects from the lower end of the second opening 44. The spline forming punch 3 is formed in the first opening 42.
0 is arranged to be able to move forward and backward.

The spline forming punch 30 has a first
A large-diameter portion 46 slidably contacting the inner peripheral surface forming the opening 42;
The length of the hole 6a is shorter than the depth of the hole 6a of the preliminary shaft portion 6.
And a rod portion 50 having a diameter D2 smaller than the opening diameter D1 and a rod portion 50 provided coaxially with the spline portion 48 and having a diameter D3 smaller than the spline portion 48 (see FIG. 6). ). The spline processing portion 48 is provided with a cutting edge portion 48a extending inclining in a radially outward direction from a boundary portion with the rod portion 50, and the cutting edge portion 48a is provided with the spline forming punch 30 and the shaft portion 18. It has a function of processing the inner peripheral surface of the shaft portion 18 when separating from the shaft portion 18. The first spring member 5 is provided on the upper surface of the large diameter portion 46.
2 are engaged, and the spline forming punch 30 is constantly pressed downward via the first spring member 52.

The outer diameter ironing die 32 has a second opening 4.
4 and is pressed downward via a second spring member 54 interposed in the second opening 44. The shaft portion outer diameter ironing die 32 is movable in the second opening portion 44 in the axial direction by a distance L, while the spline forming punch 30 moves in the first opening portion 42 in the axial direction by the distance L.
Only can move forward and backward. An outer ring take-out mechanism 56 is provided on the upper surface of the die 28 . The outer ring take-out mechanism 56 is provided with a locking member 6 which is movable in the horizontal direction in FIG.
0, and the lower surface of the distal end portion of the locking member 60 has a tapered surface 6.
2 are formed.

Next, the manufacturing apparatus 10 configured as described above
Will be described in relation to the manufacturing method according to the present embodiment.

First, as shown in FIG. 1, after the preliminary cup portion 4 of the outer race material 2 is packaged on the upper side of the track groove forming punch 26, the upper die 24 is lowered. Therefore, the preliminary cup portion 4 is plastically deformed by being squeezed between the squeezed surface 28a of the die 28 and the track groove forming punch 26, and the track groove 12 extending in the axial direction is provided on the inner peripheral surface. The cup portion 14 is formed (see FIG. 2). At this time, since the tapered surface 62 of the locking member 60 constituting the outer ring take-out mechanism 56 comes into contact with the preliminary cup portion 4, the locking member 60 is pressed against the elastic force of the spring 58. Separate from.

On the other hand, on the auxiliary shaft portion 6 side of the outer race material 2, a spline processing portion 48 of the spline forming punch 30 is inserted into the hole 6 a of the auxiliary shaft portion 6. And
When the upper mold 24 is further lowered, the shaft outer diameter ironing die 32 provided in the second opening 44 of the support member 40 engages with the outer peripheral surface of the spare shaft portion 6, and the shaft outer diameter Ironing die 3
The preliminary shaft portion 6 is squeezed between the second ironing surface 32a and the spline forming punch 30, and is plastically deformed. Therefore, as shown in FIG. 7, the spare shaft portion 6 is plastically deformed in a radially inward direction corresponding to the outer shape of the spline forming punch 30 to form the shaft portion 18, and the inner periphery of the shaft portion 18 is formed. The surface is the rod portion 5 of the spline forming punch 30.
Surround 0.

When the upper die 24 is raised in a state where the spline forming punch 30 and the shaft outer diameter ironing die 32 are arranged at the bottom dead center position (see FIG. 3), the second member provided on the support member 40 is raised. The first and second stopper portions 34 and 36 engage with the large diameter portion 46 of the spline forming punch 30 and the shaft outer diameter ironing die 32 (see FIG. 4). And upper mold 2
4 further rises, and the spline forming punch 30 and the shaft outer diameter ironing die 32 are synchronized with the shaft 1
8 starts moving in a direction to leave. For this reason, the spline portion 16 is formed via the spline processing portion 48 on the inner peripheral surface which is formed with the hole portion 6a of the shaft portion 18 and is plastically deformed in accordance with the outer shape of the rod portion 50. ).

In this case, in this embodiment, the opening diameter D1 of the hole 6a of the auxiliary shaft 6 is set to be larger than the diameter D2 of the spline processing portion 48 of the spline forming punch 30. After the spline processing section 48 is inserted into the 6a, the auxiliary shaft section 6 is inserted through the shaft outer diameter ironing die 32.
Is plastically deformed in a radially inward direction to form a shaft portion 18. Next, the spline portion 16 is formed in the shaft portion 18 by synchronously moving the spline forming punch 30 and the shaft portion outer diameter ironing die 32 in a direction away from the shaft portion 18. For this reason, unlike the conventional method of forming a spline portion when a spline forming punch is fitted into a processing hole of a spare shaft portion, the end portion of the shaft portion 18 is partially spread outward to prevent axial misalignment. This can be reliably prevented from occurring, and moreover, the thickness of the spline portion 16 is increased at the bottom, so that the bottom does not rise locally. As a result, a uniform spline portion 16 is formed as a whole, and a step of post-processing the excess thickness at the bottom of the spline portion 16 becomes unnecessary, so that the outer ring 20 can be formed efficiently and with high accuracy. Is obtained.

When the upper die 24 is raised, the end of the cup portion 14 of the outer race 20 comes into contact with the upper surface of the locking member 60 constituting the outer race take-out mechanism 56 (see FIG. 5). Therefore, when the upper die 24 is further raised, the outer race 20 is automatically detached from the track groove forming punch 26 via the locking member 60.

[0023]

According to the method and the apparatus for manufacturing the outer race of the constant velocity joint according to the present invention, the following effects can be obtained.

In a state in which the spline forming punch is inserted into the shaft portion of the outer ring, the shaft portion is pressed and deformed through the shaft portion outer diameter ironing die in accordance with the outer shape of the spline forming punch. A spline portion is formed in a portion surrounding the rod portion of the spline forming punch via the spline forming punch and the shaft outer diameter ironing die. For this reason, it is possible to prevent the spline portion from being displaced in the axis, and to prevent a locally thick portion from being formed on the bottom portion of the shaft portion. As a result, a uniform spline portion is formed as a whole, and post-processing and the like become unnecessary, so that an efficient and highly accurate outer ring manufacturing operation is performed.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view of an apparatus for manufacturing an outer race of a constant velocity joint according to the present invention.

FIG. 2 is an explanatory view of an operation of forming a cup portion of an outer race material by the manufacturing apparatus.

FIG. 3 is an explanatory diagram of a bottom dead center position of an upper die constituting the manufacturing apparatus.

FIG. 4 is an explanatory diagram when an upper die constituting the manufacturing apparatus is lifted.

FIG. 5 is an explanatory diagram of an end state of an outer ring manufacturing operation by the manufacturing apparatus.

FIG. 6 is a diagram showing a relationship between a diameter of a spline forming punch constituting the manufacturing apparatus and an opening diameter of a spare shaft portion.

FIG. 7 is an explanatory view showing a state in which a spare shaft portion is plastically deformed surrounding a rod portion of the spline forming punch.

[Explanation of symbols]

 2 ... outer ring material 4 ... spare cup part 6 ... spare shaft part 10 ... manufacturing device 12 ... track groove 14 ... cup part 16 ... spline part 18 ... shaft part 20 ... outer ring 22 ... lower mold 24 ... upper mold 26 ... track groove formation Punch for punch 28 ... Die 30 ... Punch for forming spline 32 ... Die for ironing outer diameter of shaft part 34,36 ... Stopper part 42,44 ... Opening part 48 ... Spline processing part 50 ... Rod part 56 ... Outer ring removal mechanism 60 ... Locking member

Claims (2)

(57) [Claims] An internal peripheral surface is formed integrally with a cup portion having an axially extending track groove formed therein and a shaft portion having an internal peripheral surface formed with an axially extending spline portion. A method for manufacturing an outer race of a constant velocity joint, comprising a spline forming punch provided with a cutting edge portion at a tip end.
The above, formed to a diameter equal to or greater than the diameter of the punch
Insert the spline forming punch into the shaft and insert it into the shaft.
The outer diameter of the shaft portion ironing die is relatively set along the outer periphery of the shaft portion.
Move the inner peripheral surface of the shaft part to a spline molding pan.
The shaft so that it bites into the cutting edge at the tip
Plastically deform the spline forming punch tip
Detach the cutting edge part and the iron die with the outer diameter of the shaft from the shaft
In the same direction while maintaining the outer diameter constrained state,
As the spline part is formed on the inner peripheral surface of the shaft part
A method for manufacturing an outer ring of a constant velocity joint, characterized by comprising: And a shaft portion having an inner peripheral surface formed with a track groove extending in an axial direction and a shaft portion having an inner peripheral surface formed with an axially extending spline portion. An apparatus for manufacturing an outer race of a constant velocity joint, wherein a tip portion is smaller in diameter than an opening diameter of a hole provided in the shaft portion.
Inner diameter of the shaft part, which is shorter in diameter than the depth of the hole of the shaft part
It is a cutting edge part for forming splines on the surface,
And provided coaxially with the cutting edge portion, and from the cutting edge portion.
A spline forming punch having a small-diameter rod portion, and the spline forming punch inserted into the shaft portion.
In the state, the shaft portion is formed into an outer shape of the spline forming punch.
Press and deform according to the shape and detach from the shaft
When the shaft is moved synchronously with the spline forming punch,
Shaft outer diameter iron forming a spline part on the inner peripheral surface of the part
A, the spline forming punch and the shaft outer diameter ironing die
And the first and second switches for supporting
An apparatus for manufacturing an outer race of a constant velocity joint, comprising: a topper .