JP2523539Y2 - Snap ring groove processing equipment for workpieces with splines - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cylindrical spline work having a peripheral wall portion formed by press-forming a spline peak and a valley portion for use in a clutch drum of a hydraulic clutch of an automatic transmission for a vehicle. The present invention relates to a snap ring groove machining device for a splined work, wherein a groove for fitting a snap ring is formed at a peak portion of a spline.

[0002]

2. Description of the Related Art Conventionally, as a method of forming a groove for fitting a snap ring in a work with a spline, there is known a method in which a peak portion of a spline is half-punched and a groove is formed by a dent of a half-punched trace (particularly). See JP-A-58-225225).

[0003]

[Problems to be Solved by the Invention] When a punch is cut into the ridge to cut out the ridge half, the flesh protrudes on both sides in the width direction of the ridge, and burrs are generated at the boundary with the snap ring groove. It is necessary to perform deburring in a post-process. In view of the above, an object of the present invention is to provide a device capable of forming a snap ring groove without generating burrs.

[0004]

In order to achieve the above object,
The device of the present invention includes a lower mold and an upper mold, and the lower mold includes a work receiver for holding a work, and a plurality of punches that radially advance toward the peripheral wall of the work in conjunction with the lowering of the upper mold. Forming, at the tip of each of the punches, a groove processing portion that cuts into the peak of the spline, and projections on both sides that protrude toward the front of the groove processing portion that are located on both outer sides in the width direction of the peak and form a groove. An inclined portion which is inclined forward toward each protrusion is formed on both side portions of the portion.

[0005]

[Function] After setting the work with spline in the work receiving part of the lower die, the upper die is lowered. According to this, each punch advances toward the peripheral wall portion of the workpiece, and the groove processing portion cuts into the peak portion of the spline to form a groove. At this time, the meat is about to protrude on both sides of the mountain, but the slopes on both sides of the grooved part bite into both sides of the mountain, and the meat is brought inward,
Burrs are prevented from occurring.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, a spline is formed by press-forming a spline on a peripheral wall, and a cylindrical splined work W having a clutch drum as shown in FIG. 3 shows an apparatus for forming a groove b for fitting a snap ring a. Referring to FIG. 1, reference numeral 1 denotes a lower die, and 2 denotes an upper die which can be moved up and down. A cylindrical work receiver 3 which can be set on the lower die 1 with the work W facing downward, and a work W Inner circumference tooth profile 4a corresponding to spline
And a projection 5a on the upper surface of the inner peripheral portion facing the lower end of the workpiece W below the die 4.
The knockout 5 having the above structure was attached by urging upward with a spring 6. As shown in FIG. 2, the work receiver 3 is formed with radial guide holes 7 facing the respective peaks Wa of the spline, and punches 8 are slidably inserted into the respective guide holes 7. The upper die 2 is provided with a driver cam 9 consisting of a tapered pin which is inserted into the inner periphery of the work receiver 3 and which comes into contact with the inclined edge at the upper end of the punch 8 from above.
, The punches 8 are advanced radially outward through the cams 9. In addition, a pad 10 that contacts the upper end of the workpiece W is attached to the upper die 2 and the die 4
Push rod 11 that abuts knockout 5 through
And the knockout 5 is pushed down when the upper mold 2 descends,
The knockout 5 is lifted by the spring 6 by releasing the push by the push rod 11 when ascending, and the tapered portion 5a on the inner periphery of the knockout 5 is brought into contact with the inclined edge at the lower end of the tip of each punch 8 to hold each punch holder 8. The workpiece W was retracted inward, and then the work W was pushed up by the projection 5a.

The tooth 4a of the die 4 is formed with a concave portion 12 corresponding to the location where the groove b is formed. The concave portion 12 is located at the tip of each punch 8 on the same horizontal plane as the concave portion 12. As clearly shown in FIG. 3, a grooved portion 13 having an arc shape in a plan view that cuts into the peak Wa of the spline, and projections on both sides protruding forward of the grooved portion 13 located on both outer sides in the width direction of the peak Wa. And protruding portions 14, 14, and further, on both sides of the grooved portion 13, inclined portions 15, 15 which are inclined forward toward
Was formed. Thus, when the punch 8 is advanced outward in the radial direction, first, the inclined portions 15, 15 bite into both side surfaces of the peak Wa, and then the grooved portion 13 bites into the peak Wa over the entire width thereof. The portion Wa is partially cut into a groove shape. The flesh on both sides of the ridge Wa is brought inward by the wedge action of the inclined portions 15, 15, and the protrusion of the flesh on both side surfaces of the ridge Wa is prevented.

[0008]

[Effect of the Invention] As is apparent from the above description, according to the present invention, the grooved portion of the punch is cut into the peak while suppressing the protrusion of the meat on both side surfaces of the peak by the inclined portion of the punch. This makes it possible to form grooves by removing the burrs in a later step, thereby improving the productivity.

[Brief description of the drawings]

FIG. 1 is a partially cut-away side view of an example of the device of the present invention.

FIG. 2 is a plan view of a part of a lower mold.

FIG. 3 is an enlarged plan view of the tip of the punch.

FIG. 4 is a perspective view of a workpiece processed by the apparatus of the present invention.

[Explanation of symbols]

1 Lower mold 2 Upper mold 3 Work receiver
8 Punch 13 Groove processing part 14 Projection part 15 Inclined part
W Work Wa Yamabe

Claims (1)

(57) [Scope of request for utility model registration] An apparatus for forming a snap ring fitting groove at a spline peak in a cylindrical splined work formed by press forming a peak and a valley of a spline on a peripheral wall. A lower mold having a work receiver for holding the work, and a plurality of punches which are radially advanced toward the peripheral wall of the work in conjunction with the lowering of the upper mold; At the end of the groove, a grooved portion that cuts into the peak of the spline, and protrusions on both sides that protrude toward the front of the grooved portion that are located on both outer sides in the width direction of the peak, are formed on both sides of the grooved portion. An apparatus for processing a snap ring groove for a work with a spline, wherein an inclined portion inclined forward is formed toward each projection.