JPH0510997Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an outer ring processing device for processing the outer ring of a constant velocity joint using a forging press.

2. Description of the Related Art The outer ring of a constant velocity joint used for power transmission in conventional vehicles has a spherical hollow chamber, and the opening of the hollow chamber is formed to be smaller than the inner diameter of the hollow chamber. Therefore, when manufacturing the outer ring by forging, a special mold is required, and various manufacturing methods and processing devices have been proposed.

For example, Japanese Patent Publication No. 58-52729, Japanese Patent Publication No. 57-62831
No., JP-A-57-177843, JP-A-60-18247,
JP-A-59-147733, JP-A-59-24545, etc.

Problems to be Solved by the Invention However, most of the above methods and devices use a split mold to form a spherical hollow chamber. Since the mold is shrunk and extracted from the opening, the structure of the mold is complicated and expensive.

This invention was made for the purpose of improving the above-mentioned problems.

Means and operation for solving the problem In a machine for processing the outer ring of a constant velocity joint using a die and a collet attached to a forging press, the spherical portion 5a of the collet is formed into a slit 5d.
The spherical part 5a is inserted into the outer ring hollow chamber 4b, and the collet 5 is divided into a plurality of parts in the circumferential direction.
By expanding the spherical part 5a with the taper part 9a of the mandrel 9 inserted therein, the outer circumferential surface of the outer ring 4 is ironed, and the outer ring hollow chamber 4b is drawn and inner surface processed. A constant velocity joint outer ring machining device that makes it possible to machine the outer ring of a constant velocity joint using a mold.

Embodiment This invention will be described in detail with reference to an illustrated embodiment.

In the figure, 1 is a forging press, and a die set 2 is mounted on a bed 1a.

Dice 3 provided on the top of the die set 2
has a cavity 3a for ironing the outer peripheral surface of the outer ring 4 of the constant velocity joint, and the cavity 3a
The upper surface of the outer ring 4 is opened, and the outer ring 4, which has been rough-machined in advance, is placed in the opening 3b with the shaft portion 4a facing downward. The outer ring 4 is the shaft portion 4
It has a spherical hollow chamber 4b on the opposite side of a, and the hollow chamber 4b has an open top surface, and this opening 4
The spherical portion 5a of the collet 5 can enter the hollow chamber 4b from the point c.

The collet 5 has a cylindrical shape, and the cylindrical portion 5
The spherical part 5a is formed at one end of b, and the flange 5c is formed at the other end, and the cylindrical part 5
b and the spherical part 5a has a slit 5d parallel to the axis.
For example, it is divided into six parts in the circumferential direction.

Furthermore, roller-shaped protrusions 5e are provided on the outer peripheral surface of the divided spherical portion 5a, and these protrusions 5e
A groove in which a ball (not shown) rolls is formed on the inner surface of the outer ring hollow chamber 4b.

On the other hand, the end of the collet 5 on the side of the flange 5c is attached to the slide 7 via the holder 6, and the spherical part 5a of the collet 5 collides with the die 3 during blank firing, and the two collide with the die 3 at the outer circumference of the collet 5. A mold hit prevention jig 8 is provided to prevent damage. The mold contact prevention jig 8 has a flange 8a formed on the upper end side, and this flange 8a is inserted into the holder 6 together with the flange 5c of the collet 5 by a slide knock-out 7a to remove the pressure member 10.
It is housed in such a way that it can be moved downwardly through.

Further, a mandrel 9 is housed within the collet 5.

The distal end side of the mandrel 9 is tapered, and the tapered part 9a abuts from the inside against a tapered surface 5f formed inside the spherical part 5a of the collet 5, and the proximal end side of the mandrel 9 is slidable. 7 is fixed on the bottom surface.

Next, the action will be explained with reference to Figures 4 to d.
The outer ring 4 that should squeeze the opening of the hollow chamber 4b is shown in Figure 4a.
As shown in the figure, the slide 7 is placed in the opening 3c of the die 3, and the slide 7 is lowered from this state.
The spherical part 5a of the collet 5 attached to the slide 7 side is inserted into the hollow chamber 4b of the outer ring 4 as shown in FIG.
inserted within.

When the tip of the spherical part 5a seats on the bottom surface of the hollow chamber 4b and the slide 7 further descends, the slide 7
The mandrel 9 fixed to the slide 7 further descends as shown in FIG.
The spherical portion 5a divided by the slit 5d at a is elastically expanded to form the product shape. Thereafter, when the slide 7 is further lowered, the outer ring 4 is pushed into the die 3 through the opening 3c as shown in FIG. Drawing processing is performed.

When the opening of the hollow chamber 4b is completed, the mandrel 9 rises as the slide 7 rises, and the spherical part 5a divided by the slit 5d contracts in the radial direction, so that the spherical part 5a of the collet 5
can be extracted from the hollow chamber 4b of the outer ring 4 which has been completely squeezed.

Effects of the Idea As detailed above, this idea involves machining the outer circumferential surface of the outer ring by attaching the workpiece to the bottom of the integrated die and ironing it.
It is now possible to finish the outer ring periphery with fewer steps, reducing the number of steps and improving productivity accordingly.As the die structure is simple, inexpensive molds can be used, and it is possible to reduce the number of steps during molding. There is no risk of damage or malfunction.

Furthermore, by providing a mold contact jig on the outer periphery of the collet, even if the collet is blank-shot by mistake, the spherical part of the collet and the die will not collide, so damage to the collet and the die can be reliably prevented.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, with Figure 1 being an overall sectional view, Figure 2 being a front view of the collet, and Figure 3 being a front view of the collet.
The figure is a sectional view taken along the line of FIG. 2, and FIGS. 4a to 4d are action explanatory views. 1 is a forging press, 3 is a die, 4 is an outer ring, 5 is a collet, 5a is a spherical part, 5d is a slit, 9 is a mandrel, and 9a is a tapered part.

Claims (1)

[Scope of utility model registration request] In a machine for processing the outer ring 4 of a constant velocity joint using a die 3 and a collet 5 mounted on a forging press 1, the spherical part 5a of the collet 5 is divided into a plurality of parts in the circumferential direction by slits 5d, and the spherical part 5a is into the outer ring hollow chamber 4d, and the tapered part 9a of the mandrel 9 inserted into the collet 5.
By expanding the spherical portion 5a, the integrated die 3 is used to iron the outer circumferential surface of the outer ring 4, and to draw and process the inner surface of the outer ring hollow chamber 4b. This outer ring machining device for a constant velocity joint is provided with a die collision prevention jig 8 that prevents a collet 5 and a die 3 from colliding during dry striking.