JPS62282734A - Manufacture of multi-stage puliey - Google Patents

Abstract

PURPOSE:To obtain a multi-stage pulley having a high accuracy without wasting a material, by dividing the outside peripheral edge of a metallic disk into plural parts, bending them to the outside so as to become a different level to each other, forming two pieces of cylindrical bodies on both sides of the metallic disk, and forming a belt stretching part on the outside peripheral surface of the cylindrical body. CONSTITUTION:A slitting roller die 8 having an edge part 7 is pressed against on outside peripheral edge 6 of a disk 1 which has been clamped by clampers 2, 3, the clampers 2, 3 and the slitting roller die 8 are rotated, and V-shaped split pieces 9, 10 are formed on the outside periphery of the disk 1. Subsequently, by clampers 15, 16 of a large diameter and a small diameter, the disk 1 is clamped concentrically, a forming roller die 18 is pressed from the outside periphery of the disk 1, and by smooth surface forming parts 17a, 17b of dies 19, 20 of a small diameter and a large diameter, two pieces of cylindrical bodies 22, 33 having each different radius are formed on both of the disk 1, and a pulley for a flat belt is completed. Also, in case of a V-pulley, a roller die 27 having a V-crest 26 on the outside periphery is pressed against belt hooking parts 24, 25 of the cylindrical bodies 22, 23, a V-groove 28 is formed and a multi-stage V-pulley is completed.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention and Field of Industrial Application] This invention involves dividing the outer peripheral edge of a metal disc into slots, and attaching a belt hook to each divided piece. The present invention relates to a method of manufacturing the formed multistage pulley.

[Prior Art] Conventionally, multi-stage pulleys have been manufactured by generally using methods such as casting or forging, or forming a base material by casting or forging and then cutting the base material.

[Problems to be Solved by the Invention] According to the above-mentioned conventional method for manufacturing a multi-stage pulley, manufacturing work is troublesome and time-consuming, resulting in poor productivity, difficulty in reducing weight, and furthermore, when cutting is involved, However, there is a problem that chips are generated and a large amount of material is wasted.

This invention provides a method for manufacturing a multi-stage pulley aimed at solving the above problems.

[Means for Solving the Problems] In the method of manufacturing a multi-stage pulley according to the present invention, first, the outer peripheral edge of one metal disk is divided into slots in the direction of the center to form divided pieces.

Next, the two divided pieces formed by slitting are bent outward in the centrifugal direction of the metal disk so that the steps are different from each other, so that two pieces with the same center are formed on both sides of the metal disk. Form a cylinder.

Next, a belt hanging portion is formed on the outer circumferential surface of each of the above-mentioned cylindrical bodies [Example] The present invention will be described in detail below based on an example shown in the drawings.

1 to 5 show steps for implementing the present invention.

First, a circular plate 1 is formed by punching a steel plate by pressing or the like, and this metal circular plate 1 is clamped from both sides by clampers 2.3. Each of the clampers 2.3 is formed with a relief portion 4.5 that allows the outer circumferential edge to expand when the outer circumferential edge of the disk 1 is scraped using a slitting roll die (described later). figure).

A slitting roll die 8 having a 7-shaped blade portion 7 on the circumference is pressed toward the center of the disk 1 on the outer peripheral edge 6 of the disk 1 clamped by the clampers 2 and 3 in this manner. 3 and the slitting roll die 8 are rotated. Thus, the outer peripheral edge 6 of the disc 1 is slotted into two parts,
A V-shaped divided piece 9.10 is slotted on the outer periphery of the disk 1.
is formed (Figure 2).

Next, it has a cylindrical abutment part 13.14 with the outer peripheral edge 6 as a support surface 11.12 for supporting the divided pieces 9, 10 of the disk 1, and the radius of each abutment part 13, 14 is The disk 1 is concentrically clamped by a large-diameter clamper 15 and a small-diameter clamper 16 that are different from each other. In this way, the large diameter clamper 15
A belt hanging part forming roll die 18 having a smooth surface forming part 17 perpendicular to the disk l on the circumference is attached to the divided pieces 9° 10 of the disk l clamped by the small-diameter clamper 16. Press it toward the center. This belt hook forming roll die 18 has a small diameter die 19 on the side of the large diameter clamper 15 with the position corresponding to the branching point of the two divided pieces 9 and 10 formed on the outer periphery of the disk l as a border,
The small-diameter clamper 16 side has a large-diameter die 20, and the small-diameter die 19 side of the large-diameter die 20 has an acute-angled blade portion 2.
1 (Figure 3).

By pressing and rotating the roll die 18 for forming the belt hanging part against the divided pieces 9.10 of the disc 1 clamped by the large-diameter clamper 15 and the small-diameter clamper 16 as described above, the disc l Of the two divided pieces 9 and 10 formed on the outer periphery, the divided piece 9 on the large diameter clamper 15 side is pressed by the smooth surface forming part 17a of the small diameter die 19 of the belt hanging part forming roll die 18 and is pushed outward. bent.

By being pressed between the smooth surface molded portion 17a and the contact surface 11 of the large-diameter clamper 15, a cylindrical body 22 is formed with the divided piece 9 on the large-diameter clamper 15 side of the disk 1. On the other hand, for the other divided piece 10, first, the smooth surface forming part 17b of the large-diameter die 20 presses and bends the divided piece 10 outward, and at the same time, the blade part 21 of the large-diameter die 20 joins the divided piece 10. At which branching point of the split piece 9 the disc l is further split in the center direction, and the split piece 10, which is bent outward in this way and further split in the center direction, is connected to the smooth surface molded portion 17b and has a small diameter. By being compressed by the support surface 12 of the clamper 16, a cylindrical body 23 is formed with the divided piece lO on the small diameter clamper 16 side of one disc l. That is, two (11) cylinders 22 and 23 having the same center and different radii are formed on both sides of one disk l.
The outer peripheral surfaces of belt hooks 2 and 23 are smoothed by smooth surface forming parts 17a and 17b of belt hook forming roll die 18, respectively, to form belt hooks 24 and 25 (FIG. 4).

The multi-stage pulley completed in this way has a belt hanging part 24.
, 25 are pulleys for smooth flat belts, but when manufacturing a V pulley for hanging a V belt with multiple V ridges, the cylindrical body 22 , ? 3
A roll die 27 having an appropriate number of V ridges 26 formed on the outer periphery according to a predetermined V belt is pressed against the belt hanging portion 24,25.

By pressing this roll die 27, the belt hanging portion 2
4 and 25 are formed with V grooves 2 and 8 to complete a multi-stage pulley (Fig. 5).

Figures 6 to 10 show the process of manufacturing other multistage pulleys, and the pulley manufactured here is a V pulley on which a belt with one V thread is hung. The steps are similar to the steps shown in FIGS. 1 to 4 in the above embodiment.

Therefore, after forming cylindrical bodies 22.23 with different radii on both sides of the disk 1 as shown in FIG.
2 respectively in the circumferential direction ViIl! 29.30 was formed with the groove forming clamper 31.32, and the disc L was clamped with the V groove 33.3 corresponding to the V groove 29.30.
4 is formed in the circumferential direction, and the divided pieces 9 and 10 forming the cylinder body 22 and 23, that is, the belt hanging part 2
4.25, the belt hanging part 24.2
5 is pinched by the V ridges 33.34 and the V grooves 29, 30 and bent into 7 strips, and the belt hanging portion 24.25 has a groove 3.
6 is formed to complete the multistage V pulley (Figure 10)
.

[Effects of the Invention] As described above, the method for manufacturing a multi-stage pulley according to the present invention is to divide the outer peripheral edge of one metal disc toward the center by slotting, and then dividing the outer peripheral edge of one metal disk into two pieces formed by the slotting. The divided pieces are bent outward in the centrifugal direction of the metal disk so that they are at different levels from each other to form two cylindrical bodies with the same center on both sides of the metal disk. Since the belt hanging part is formed on the outer circumferential surface of the cylindrical body, it is easy to manufacture, there is no wastage of materials, and it is also lightweight, making it possible to obtain a highly accurate multistage pulley at a low cost. .

[Brief explanation of the drawing]

1 to 5 are explanatory diagrams showing the steps of one embodiment of the present invention, and FIGS. 6 to S10 are explanatory diagrams showing the steps of another embodiment. l...metal disc, 2.3...clamper 6...
Outer rim, 8...Roll die for slotting 9.10...
・Divided pieces, 15...Large diameter clamper 16...Small diameter clamper 18...Roll die for forming the belt hanging part 22.23.
...Cylinder 24.25...Belt hanging part Fig. 1 Fig. 2 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 70

Claims (1)

[Claims] The outer peripheral edge of one metal disk is divided into slots toward the center, and then the two divided pieces formed by the slits are separated outward in the centrifugal direction of the metal disk so that they are at different levels from each other. 2. Bend it so that the center is the same on both sides of the metal disc.
1. A method for manufacturing a multi-stage pulley, which comprises forming individual cylindrical bodies, and then forming a belt hanging portion on the outer peripheral surface of each cylindrical body.