JPH0229407B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a method for manufacturing a poly-V pulley in which a rim is formed on the outer peripheral edge of one metal disc, and a plurality of V grooves are formed in this rim. Regarding.

[Prior Art] Conventionally, a method for manufacturing a poly-V pulley in which a rim is formed on the outer peripheral edge of a single metal disc and a plurality of V grooves are formed on the rim involves clamping the metal disc from both sides. By pressing a slotted roller die against the outer peripheral edge of this metal disk and rotating it,
The outer periphery of the disk is slotted into a V-shape, then the divided pieces divided into two plates by the slotting are pushed apart, and then the two spread pieces are further pushed apart using a smooth roller die. A method in which a flat V-groove forming surface is formed on a rim on the outer periphery, and then a V-groove forming roller die having a plurality of V grooves is pressed against the V-groove forming surface of this rim to form a plurality of V grooves. is taken.

[Problems to be Solved by the Invention] According to the above-mentioned conventional method, in order to form a rim on the outer periphery of the disk, the outer periphery of the disk is divided into two by slotting, so that the thickness of the rim becomes circular. It becomes thinner, one-half the thickness of the plate, and there is a problem in terms of strength. In addition, when slotting, it is extremely difficult to split from the center even if you are careful enough, and the two pieces that are divided by slotting end up being thicker on one side and thinner on the other, resulting in poor precision. It has become difficult to obtain a good pulley, and therefore a cutting process may have to be added to make the thickness of each of the two divided pieces the same, making the work cumbersome. Furthermore, since the V-groove forming surface is formed smoothly, when a roller die with a plurality of V ridges is pressed against this V-groove forming surface to form a V-groove, there is no meat in the center of the V-groove forming surface. Concentration occurs, resulting in lack of thickness on both sides, and the V groove is not properly formed on both sides of the
There are problems in that the peaks are difficult to form, which makes it easy to produce defective products, and the V-groove forming roller die may be damaged. In order to solve this problem, a process has been adopted in which the thickness on both sides of the V-groove forming surface is thickened, but this increases the number of manufacturing steps and increases costs. There is a problem.

In order to solve the above-mentioned problems, the inventor conducted various studies and found that when forming a rim around the outer periphery of the disc, instead of using the conventional method of slotting, The inventors discovered that the rim can be formed by extruding the parts to both sides by rolling, and came up with the present invention.

That is, the present invention solves the conventional problems and provides a method for manufacturing a poly-V pulley, which aims to shorten the manufacturing process, improve precision, and reduce costs.

[Means for solving the problem] A roller die having a pressing surface formed in a convex arc shape on the outer periphery is pressed against the outer peripheral end surface of a metal disk in the radial direction, and both are rotated to release the metal. The outer periphery of the metal disk is extruded symmetrically to both sides of the disk to form a rim on the outer periphery of the metal disk, the outer circumferential surface of which is a concave arc-shaped V-groove surface.

Next, a V-groove forming roller die having a plurality of V ridges is pressed against the V-groove forming surface of the rim and rotated to form a plurality of V-grooves on the V-groove forming surface.

[Function] By pressing a roller die against the outer peripheral end of the metal disc, the outer peripheral part of the disc is pushed out symmetrically to both sides of the disc to form a rim. The outer peripheral surface of this rim becomes a V-groove forming surface, and this V-groove forming surface is formed into a concave arc shape with a concave center and high cross-sections on both sides, depending on the shape of the pressing surface of the roller die. It has a relatively thick wall.

V grooves are formed on the V-groove surface of the rim with such a shape.
When the groove-forming roller die is pressed, both sides of the V-groove forming surface are high and both sides of the rim are thick, so when forming the V-groove, the meat can flow smoothly from both sides to the center. There is no lack of material on the surface, and the V ridges on both sides can be easily and reliably formed, and each ridge formed on the V groove forming surface has no variation, and therefore has a uniform V groove with high precision. You will get a pulley.

[Example] Hereinafter, this invention will be described in detail based on an example shown in the drawings.

FIGS. 1 to 3 show steps for implementing the present invention.

First, a metal plate is punched out by pressing or the like to form a disk 1, and this metal disk 1 is clamped from both sides by clampers 2 and 3. The clamps 2 and 3 have relief parts 4 and 5 that allow the outer peripheral part of the disk 1 to be pushed out to both sides by roller dies to be described later to form a cylindrical part, and relief parts 4 and 5 on the inner peripheral surface of the cylindrical part. a support surface 6 that abuts and supports the support surface 6;
7 is formed (Fig. 1).

A roller die 10 having a pressing surface 9 formed in a convex arc shape on the outer periphery is pressed in the radial direction of the disk 1 against the outer peripheral end surface of the disk 1 clamped by the clampers 2 and 3, and rotated. let The pressing surface 9 formed around the outer periphery of the roller die 10 is formed in a convex arc shape with its center point on the center line of the outer peripheral surface, and this arc is determined by the belt width, but at least the thickness of the disk 1. Needs to be bigger. Then, the top of the circular arc of the pressing surface 9 is positioned at the center of the outer peripheral end surface 8 of the disk 1, and the pressing surface 9 is pressed against the outer peripheral end surface 8 and rotated as described above. Thus, cylindrical parts 11 and 12 are formed symmetrically on both sides of the disc 1 within relief parts 4 and 5 on the outer peripheral part of the disc 1, and furthermore, a roller die 1
By continuing to press 0, the cylindrical parts 11 and 12
The inner peripheral surfaces of the clampers 2 and 3 are in contact with the support surfaces 6 and 7 of the clampers 2 and 3, and the cylindrical portions 11 and 12 are compressed by the roller die 10 and the support surfaces 6 and 7. The cylindrical parts 11 and 12 formed on both sides of the disc 1 have almost the same thickness, and the cylindrical parts 11 and 12 make the disc 1
A rim 13 is formed around the outer periphery of the rim. The outer peripheral surface of the rim 13 formed in this way becomes a V-groove forming surface 14, and this V-groove forming surface 14 is formed by the roller die 1.
According to the shape of the pressing surface 9 of
Both sides of the wall are thicker than the center (Figure 2). The thickness of the entire rim 13 is determined by the amount of pressure movement of the roller die 10 against the disk 1, and the greater the amount of movement, the thicker the rim 13 becomes.
can be obtained, and its thickness can be determined freely.

Next, the V of the rim 13 formed on the outer periphery of the disc 1 is
The groove forming surface 14 has a plurality of V peaks 15 on the outer periphery.
The groove forming roller die 16 is pressed and rotated. Then, since both sides of the V-groove forming surface are high and both sides toward the rim 13 are thick, when forming the V-groove by pressing the V-groove forming roller die 16, the thickness is increased from both sides of the rim 13 to the center. The flow is smooth, and there is no shortage of material on both sides, and the V ridges 17a and 17b on both sides can be easily and reliably formed, and each V ridge 1 formed on the V groove forming surface 14 is
7 has no variation, so a uniform V-groove 18 is formed (FIG. 2).

In this way, the poly-V pulley is completed.

[Effects of the Invention] As described above, the method for manufacturing a poly-V pulley according to the present invention is such that a roller die having a pressing surface formed in a convex arc shape on the outer peripheral end surface of a metal disk is moved in the radial direction of the roller die. The outer periphery of the metal disc is pushed out symmetrically to both sides of the metal disc by pressing them toward each other and rotating them, thereby forming a concave arc-shaped V-groove-forming surface on the outer periphery of the metal disc. Then, a V-groove forming roller die having a plurality of V ridges is pressed against the V-groove forming surface of this rim and rotated to form a plurality of V-grooves on the V-groove forming surface.
Poly V with sufficient strength and extremely high precision
In addition to being able to obtain a pulley, the manufacturing process is significantly shortened compared to the conventional manufacturing process, which has the effect of reducing costs.

[Brief explanation of drawings]

Figures 1 to 3 are explanatory diagrams showing the steps of an embodiment of the present invention, and Figures 4 A, B, C, and D show the process of forming a rim by extruding the outer periphery of the disk using a roller die. It is an explanatory diagram. DESCRIPTION OF SYMBOLS 1... Metal disk, 8... Outer peripheral end surface, 9... Pressing surface, 10... Roller die, 13... Rim,
14...V groove forming surface, 15...V mountain, 16...V
Groove forming roller die, 18...V groove.

Claims (1)

[Claims] 1 A roller die having a pressing surface formed in a convex arc shape is pressed in the radial direction against the outer peripheral end face of the metal disc, and both are rotated, so that the outer peripheral part of the metal disc is pressed into the circular shape. A rim with a concave arc-shaped V groove forming surface is formed on the outer periphery of the metal disc by extruding it symmetrically on both sides of the plate, and then a V groove having a plurality of V ridges is formed on the V groove forming surface of this rim. A method for manufacturing a poly V pulley, which comprises forming a plurality of V grooves on a V groove forming surface by pressing and rotating a groove forming roller die.