JPS6113935B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing a ring having a pocket hole, for example, a method and apparatus for manufacturing a retainer by press forming a prepared hole for a pocket hole in a ring-shaped material for a retainer.

A rough material 1 formed by forging or rolling as shown in FIG. Progress has been made in the development of technology for punching out six pilot holes for ball pocket holes. That is, the conventional manufacturing of such a ring with a pocket hole is performed in the order of forging, primary turning, pilot hole pressing, straightening, secondary turning, pocket finishing, heat treatment, and grinding, as shown in Figure 2. Since a turning process is required before pressing and the material is directly clamped, it is necessary to improve accuracy by removing uneven thickness that cannot be avoided with forging or rolling. In addition, it is necessary to make the wall as thin as possible to minimize deformation and expansion of the material due to press working, and a turning process (primary turning) is always required. or,
It is difficult to improve the pitch accuracy of the pocket holes, the deformation and expansion of the material is unstable, and the burrs that occur on the inner peripheral surface of the material make it difficult to hold the material correctly and stably against the die. In particular, burrs take on various sizes depending on the friction between the punch and die cutting edges, and the machining conditions, and as machining progresses, they change sequentially from zero at the beginning to five at the final hole machining, so they must be kept as a constant condition. I can't figure it out. In addition, it becomes necessary to correct the pilot hole after drilling it by press working. In other words, if the machining allowance of the material is large enough to allow deformation and expansion during press working, the thickness of the material will increase, creating a vicious cycle that will cause even greater deformation and expansion. It is necessary to make the material as thin as possible while leaving the minimum machining allowance necessary for correction, reduce the pressing force, and suppress deformation as much as possible. Therefore, sag on the outer circumferential surface of the material and burrs on the inner circumferential surface inevitably occur, and a straightening process is always required to ensure machining allowance for post-turning (secondary turning) to remove these. That is, since primary turning and straightening, which are considered unnecessary in the manufacturing process, are required, there is a large disadvantage in terms of cost.

This invention solves these problems in view of the existence of the above-mentioned problems. In particular, a guide ring is press-fitted onto the outer periphery of a rough material formed by forging or rolling processing, and the guide ring is held firmly against the die. It is an object of the present invention to provide a method and apparatus for manufacturing a ring-shaped material having a pocket hole that can be stably held.

The structure of the present invention will be described below based on the embodiments shown in FIGS. 3 to 7.

A guide ring 11 is press-fitted onto the outer peripheral surface of a material 10 formed by forging or rolling. The outer surface of the material 10 has a cylindrical section 12 and a conical section 1.
3, and the inner surface is a stepped cylindrical shape 14. The inner circumferential surface of the guide ring 11 has a shape that follows the outer surface of the material 10, and has six holes 15 at equal intervals on the circumference for the punches to pass through.
is provided. The guide ring 11 into which the material 10 is press-fitted is inserted into a press device, and the guide ring 11 is clamped in the radial and circumferential directions, and the material 10 is clamped in the axial direction. At this time, the axis of the guide ring and the axis of the die and punch, or at least the axis of the punch, coincide. The punch is then lowered to punch the pocket hole 16. After drilling the pilot hole, the clamp is released and the guide ring 11 into which the material 10 is press-fitted is indexed at a predetermined angle and the work continues. The material 10 with six pilot holes 16 drilled therein is separated from the guide ring 11, and both inner and outer spherical surfaces 17, 18 with different centers of curvature and a counterbore 19 at the large diameter end are respectively turned around the outer surface. Ru. Furthermore, after broaching the pilot holes 16, the finished product is completed through processes such as heat treatment and grinding.

The method for drilling the pilot hole 16 will be explained in more detail based on the apparatus shown in FIGS. 5 and 6.

In the drawing, 30 is a bed, 31 is a die fixed to the die holder 32, 33 is a work stopper fixed to the die holder 32, 34 and 35 are guide ring guide plates fixed to the bed 30, 3
Reference numeral 6 denotes a guide ring holder that is slidable up and down using the guide ring guide plate as a reference plane; 37 is a push-up cylinder that drives the guide ring holder 36; 38 is a table that slides on a table guide 39 fixed to the bed 30; 40 and 41 are die receivers and die holders on the table 38; 42 and 43 are positioning pins that move forward and backward by positioning pin cylinders 44 and 45; 46 is a punch fixed to the press ram 47; 48 is a punch guide that guides the punch;
Reference numeral 9 denotes an air blowing means for blowing off pressed scraps by sending compressed air to a scrap removal passage provided in the die.

The guide ring 11 into which the material 10 is press-fitted is inserted into the die 31. At this time, the table 38 has retreated rearward, and the insertion is performed from the right to the left in the figure. The outer surface of the die 31 has a stepped cylindrical shape along the inner surface 14 of the material 10, and has a slightly smaller diameter than the inner diameter of the material 10. In this state, the guide ring 11 is held by the guide ring guide plates 34, 35 and the guide ring receiver 36. When the machining cycle starts, the push-up cylinder 37 rises and pushes the guide ring 11 upward. Subsequently, the positioning pins 42 and 43 move forward to fill the hole 15 of the guide ring.
The guide ring 11 is brought into contact with notched surfaces 15a and 15b that serve as positioning reference surfaces provided on both walls of the guide ring 11, and moves further forward to overcome the upward force and push down the guide ring 11. The intersection of the axes of the positioning pins 42 and 43 is the die 31,
Since it is located on the axis of the punch 46 or on the axis of the punch 46, and its forward end position is set accurately, when the positioning pins 42 and 43 finish moving forward, the axis of the guide ring 11 and the die, The axis of the punch, or at least the axis of the punch, coincides precisely.

Next, the Cheeble 38 slides toward the left in the figure and transfers the material 10 to the work stopper 33 and the die holder 4.
At the same time, the die 31 is also held between the die receiver 40 and the die holder 41. At this point, the clamping of the guide ring 11 in the radial and circumferential directions and the material 10 in the axial direction is completed. When the clamping is completed, the press ram 47 is lowered and a pilot hole 16 having an oblong or round shape is bored on the material 10. When punching a pilot hole, the inner circumferential surface of material 10 and die 3
The gap between the holes is zero, so the die 31 bears all the punching force. After drilling the pilot hole, table 38
When the positioning pins 42 and 43 move back, the guide ring 11 is pushed up by the push-up cylinder 37. At this time, the burr generated on the inner peripheral surface of the pilot hole 16 of the material 10 is the die hole 3 of the die 31.
1a to facilitate indexing. After indexing the guide ring 11 at a predetermined angle, the drilling operation of the pilot hole is continued. Further, during the operation, the pressed scraps are removed from the rear of the die through the scrap removal passage of the die 32 by the air blowing means 49.

In the embodiment, a constant velocity universal joint retainer is shown, but it goes without saying that the present invention can also be applied to a bearing retainer or a general ring.

As explained above, the present invention fits a guide ring having a plurality of holes on the outer periphery of a ring-shaped material,
Clamp the radial and circumferential positions of the guide ring to align the center of the hole in the guide ring with the axis of the punch, clamp the ring-shaped material in the axial direction, index the guide ring at a predetermined angle, and then insert the punch and die. Since a predetermined number of pilot holes for pocket holes are punched out by pressing into the ring-shaped material, the following effects can be obtained.

No pre-turning process is required. That is, even if the material has uneven thickness, the guide ring is held in the correct position relative to the die, so that pilot holes of the correct pitch are drilled on the outer periphery of the material.

Accurate pocket detection can be obtained. In other words, since the die and guide ring are held concentrically, there is no influence of burrs that occur on the inner circumferential surface of the material.
This is because stable retention can always be obtained.

No straightening process is necessary. The deformation of the material due to drilling the pilot hole is restrained by the guide ring, so there is no substantial deformation on the outer circumferential surface, and if the material is turned using the outer diameter as a reference, the pilot hole will be divided into equal parts on the outer and inner diameter sides. There is no need for correction as the pitch is correct. Furthermore, since it is a rough material after forging or rolling, the machining allowance is sufficiently large, so there is no need for modification.

The device of the present invention also includes a guide ring that substantially matches the outer surface shape of the material, has an inner diameter for fitting the ring-shaped material, and has a plurality of radial holes spaced at equal intervals in the circumferential direction through which the punches pass. , a pair of guide plates that restrict the guide ring from both sides in the radial direction, a pushing means for pushing the guide ring upward in the radial direction, and pushing the guide ring down to a predetermined position by overcoming the pushing force of the pushing means. a positioning means for positioning, and the pair of guide plates,
A die that supports a ring-shaped material fitted to a guide ring positioned at a predetermined position by a push-up means and a positioning means from its inner diameter surface, and a guide ring for the ring-shaped material supported by the die. The structure is simple and consists of a punch that enters through a hole in the radial direction of the guide ring and presses out a pilot hole for the pocket hole, and an index means that rotates the guide ring by a predetermined angle while pushing it up. It is possible to punch out pilot holes in shaped materials using a high-precision pocket pitch.
This eliminates the need for pre-turning and post-straightening, reducing man-hours and costs.

[Brief explanation of the drawing]

Figure 1 shows the relationship between a rough material formed by forging or rolling and a ring-shaped material that is cut into a ring-shaped material that has two spherical inner and outer surfaces with different centers of curvature and a counterbore at the large diameter end. The drawings and FIG. 2 are explanatory diagrams showing the manufacturing sequence of a cage for a conventional constant velocity universal joint. 3 to 6 are explanatory diagrams of the manufacturing apparatus used to carry out the method of the present invention, FIG. 3 is a sectional view showing the combined state of the rough material and the guide ring, and FIG. 4 is the diagram shown in FIG. 3A. - It is a sectional view along the A line.
FIG. 5 is an explanatory diagram of the press device, and FIG. 6 is a sectional view taken along the line BB in FIG. FIG. 7 is a sectional view of a cage manufactured by the method of the present invention. 10...Ring-shaped material, 11...Guide ring, 16...Elongated or elliptical pilot hole, 31...Dice, 46...Punch.

Claims (1)

[Claims] 1. A guide ring having a plurality of holes is fitted to the outer periphery of a ring-shaped material, and the radial and circumferential positions of the guide ring are clamped to align the center of the hole of the guide ring with the punch. Pocket holes are made by aligning the axes, clamping the ring-shaped material in the axial direction, indexing the guide ring at a predetermined angle, and punching a predetermined number of pilot holes for pocket holes in the ring-shaped material using a punch and die. A method for manufacturing a ring having 2. A guide ring that approximately matches the outer surface shape of the material, has an inner diameter for fitting the ring-shaped material, and has a plurality of radial holes spaced equally apart in the circumferential direction through which punches pass; a pair of guide plates regulating from both sides; a pushing means for pushing the guide ring upward in the radial direction; and a positioning means for overcoming the pushing force of the pushing means and pushing down the guide ring to a predetermined position. , a die that supports the ring-shaped material fitted to the guide ring, which is positioned at a predetermined position by the pair of guide plates, the push-up means, and the positioning means, from the inner diameter surface of the ring-shaped material; A punch that enters into a ring-shaped material through a hole in the radial direction of the guide ring and presses out a prepared hole for a pocket hole, and an indexing means that rotates the guide ring by a predetermined angle while pushing it up. A manufacturing device for a ring having a pocket hole.