JP3209460B2 - Spline chamfer molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spline in which chamfer portions are formed at both ends of an inner spline formed in advance on the inner periphery of an annular work (for example, a sleeve in a gear clutch of an automotive gear transmission). The present invention relates to a chamfer forming apparatus.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 2-1241 discloses a spline forming portion for forming an internal spline on the inner periphery of an annular work and a chamfer portion formed integrally with one end of the spline forming portion. A forming device (cold forging device) including a lower die having a chamfer forming part for forming (tooth chamfering) and a pressing means for pressing an annular work against the lower die.
It is shown.

[0003]

In the apparatus disclosed in the above publication, a chamfer can be formed at one end of the inner spline, but a chamfer cannot be formed at both ends of the inner spline. When it is necessary to form a chamfer at both ends of the inner spline, it is necessary to form a chamfer at the other end of the inner spline by post-processing. It is also possible to form chamfers at the inner spline and at both ends thereof by using a mold having the same shape on both the upper and lower sides. In this case, a place where the upper and lower dies meet (near the center of the inner periphery of the work). In addition, post-processing is required to remove the excess, which increases the production cost. The present invention has been made to address the above-described problem, and an object of the present invention is to provide a forming apparatus capable of forming a chamfered portion at both ends of an inner spline on the inner periphery of a work without requiring post-processing. The purpose is.

[0004]

The present invention SUMMARY OF], in order to achieve the above object, a spline portion of the lower mating spline inner previously formed on the inner periphery of the ring Jowa over click the lower end of the spline portion a lower die having a chamfer forming portion for forming a chamfer at one end portion of the inner <br/> splines of the word click is integrally formed at a portion, the spline portion of the top and fitting of the inner splines of the word click have the a chamfer forming portion for forming a chamfer portion at the other end of the internal splines of the word click is integrally formed on the upper end <br/> site of the spline portion
It includes a upper mold to, to pressure the upper mold relative to the lower die
Contact the spline chamfer portion molding device configured to so that
And the inner spline of the work is
The upper part of the inner spline of the same work
Prior to the engagement of the upper spline sections with each other.
The axial guide that fits into the
It is formed at the upper end of the mold and the lower end of the upper mold.
To provide a spline chamfer section forming device
is there.

[0005]

In the molding apparatus according to the present invention, the work is inserted so that the lower part of the inner spline is fitted to the lower spline part, and the upper part of the spline part is inserted into the upper part of the inner spline of the work. When the upper die is pressed against the lower die, the chamfer portion is formed at the lower end of the work by the lower chamfer forming portion, and at the same time, the upper end of the work is formed by the upper chamfer forming portion. The chamfer is formed. Therefore, the chamfer portion can be formed at both ends of the inner spline on the inner periphery of the work without requiring post-processing. Further, the molding equipment according to the present invention, because it is intended to form a chamfer portion at both ends of the spline inner preformed on the inner circumference of the work, it is possible to reduce the equipment cost can be processed in a compact molding apparatus, the upper The burden on the mold and the lower mold is small, and the life of the mold is improved. Further, in the molding apparatus according to the present invention,
Fits the inner spline of the workpiece to the lower spline
The upper die over the inner spline of the same workpiece.
Axes that engage with each other prior to fitting
Direction guide and circumferential detents at the upper end of the lower mold and the upper mold
With a simple structure,
Precisely prevent rotation phase shift between upper and lower molds
Can be. Also, when the upper die is lowered, the upper end surface of the lower die
To determine the amount of movement of the upper die relative to the lower die.
When the topper is provided on the upper die,
Thickness accuracy can be ensured.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows an apparatus for forming a spline chamfer portion (cold forging machine) according to the present invention. This forming apparatus is configured such that both ends of an inner spline W1 formed in advance on the inner periphery of an annular work W by cold forging. Each of the sections has a chamfer section, and includes a lower mold 11 and an upper mold 21.

As shown in FIGS. 1 to 4, the lower mold 11 is formed integrally with a spline portion 11a to be fitted into a lower portion of the inner spline W1 of the work W, and a lower portion of the spline portion 11a. Spline W in the workpiece W
1 has a chamfer forming portion 11b which forms a chamfer portion, and an axial guide 11c and a circumferential detent 11d into which the upper die 21 is fitted, and a knockout pin 12 are fitted. It has a groove 11e, and has a plate 13, a backing plate 14, a die inner 1
5, together with the outer die 16, the ring 17, and the like are mounted on the base of the press machine. In addition, the die inner 15 is press-fitted into the die outer 16 and is integrated. The knockout sleeve 1 is provided between the lower mold 11 and the backing plate 14 and the die inner 15.
8 is mounted so as to be able to move up and down, and is moved up and down by a knockout pin 12.

As shown in FIGS. 1 and 5 to 7, the upper die 21 has a spline portion 21a fitted to the upper part of the inner spline W1 of the work W, and an upper part of the spline portion 21a. and has a chamfer forming portion 21b for forming a chamfered portion is formed on the other end of the internal splines W1 in the workpiece W, the shaft which fits into the lower mold 11
It has a directional guide 21c and a circumferential detent 21d, and is assembled to the ram of the press together with the stopper 22, the ring 23 and the like.

In the molding apparatus of this embodiment configured as described above, the work W is inserted so that the lower part of the inner spline W1 is fitted to the spline portion 11a of the lower mold 11, and the inner spline of the work W Upper die 21 on top of W1
The upper die 21 and the lower die 11
1, a part of the upper mold 21 is fitted into a part of the lower mold 11 as shown in the right half of FIG. At the same time as the chamfered portion is formed on the portion, the chamfered portion is formed on the upper end portion of the work W by the chamfer forming portion 21b of the upper die 21. Therefore, the chamfer portion can be formed at both ends of the inner spline W1 on the inner periphery of the work without requiring post-processing. Further, in this molding apparatus, the inner spline W1 formed in advance on the inner periphery of the workpiece W is used.
Since the chamfers are formed at both ends of the mold, the molding cost can be reduced even with a small molding apparatus, and the burden on the upper mold 21 and the lower mold 11 is small, and the life of the mold is improved.

The amount of movement of the upper die 21 with respect to the lower die 11 is determined by the contact of the stopper 22 with the upper surface of the lower die 11, so that the thickness accuracy of the work W is ensured. The upper die 21 is located above the inner spline W1.
Of the upper die 21 before the spline portion 21a of the
Are fitted to the lower mold 11 by an axial guide and a circumferential detent to prevent a phase shift in the rotational direction of both molds. Further, after the upper die 21 moves upward, the knockout pin 12 moves upward, and the work W is lifted by the knockout sleeve 18 and detached from the lower die 11.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view schematically showing an embodiment of a spline chamfer portion forming apparatus according to the present invention.

FIG. 2 is an enlarged front view of a lower die shown in FIG.

FIG. 3 is a top view of the same.

FIG. 4 is a partially enlarged view of a lower mold.

FIG. 5 is an enlarged front view of the upper die shown in FIG.

FIG. 6 is a bottom view of the same.

FIG. 7 is a partially enlarged view of the upper die.

[Explanation of symbols]

11: Lower mold, 11a: Spline part, 11b: Chamfer molding part, 21: Upper mold, 21a: Spline part, 21b
... Chamfer forming part, W ... Work, W1 ... Inner spline part.

Claims (2)

(57) [Claims] 1. A ring Jowa over click of the inner splined portion to the lower mating spline inner previously formed on the circumferential inner spool of the word click is integrally formed on the lower end portion of the spline portion <br / > and the lower mold having a chamfer forming portion for forming a chamfer portion at one end of the line, said word click is integrally formed with the upper and the mating splined portion of the inner splines on the upper end portion of the spline portion of Wah to have a chamfer forming portion for forming a chamfer portion at the other end of the internal splines of the click
Includes a upper mold and pressurizing said upper die relative to said lower die
Uni configured spline chamfer forming apparatus odor
Then, the inner spline of the work is attached to the lower spline part.
In the state of fitting, above the inner spline of the same work
Mates with each other before the upper splines fit together
The axial guides and the circumferential detents on the lower mold
The switch is formed at the end and the lower end of the upper die.
Prine chamfer section molding equipment. 2. When the upper die is lowered, the lower die is attached to the upper end surface.
A strike that abuts and regulates the amount of movement of the upper die relative to the lower die.
2. The method according to claim 1, wherein a hopper is provided on the upper die.
On-board spline chafer section forming device.