JPS58163537A - Manufacture of annular v-pulley - Google Patents

Abstract

PURPOSE:To manufacture an annular V-pulley having uniform thickness and high V-groove accuracy, by blanking the center of a circular steel plate, forming it to a bell shape, making the peripheral wall vertical and forming a V-groove by compression. CONSTITUTION:A circular steel plate 1 of specified thickness is deeply drawn, and at the same time, its center is blanked round to form a circular blanked hole 2a. At the same time, its open end is expanded to form a bell-shaped material 2. Drawn part 2d of peripheral wall 2c of the bell-shaped material 2 is raised upright, and expanded outward to obtain a material 4 for forming a pulley. A V-groove 5a is formed on the peripheral wall 4c, and upper and lower edges of upper and lower side walls A, B are bent and formed to obtain a V- pulley.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a ring-shaped V7" ring. The purpose thereof is to make the wall thickness uniform, (1) increase the seismic intensity of the groove, and, in particular, significantly reduce the material cost. It is an object of the present invention to provide a method for manufacturing a ring-shaped V pulley made of sheet metal that can be reduced in weight.

Various methods are known for manufacturing ring-shaped V pulleys from sheet metal materials, but the latest manufacturing method is to press sheet metal materials to create a ring-shaped V pulley with a bottomed cylindrical shape with an enlarged opening end. A cup-shaped material is formed, the bottom of this cup-shaped material is cut and removed to form a cylindrical boo forming material with openings at both ends, and a series of compressive deformations are applied to this pulley forming material to form a finished product. A ring-shaped V pulley was proposed by the applicant, and was published in Japanese Patent Publication No. 5
No. 6-28612.

This product has problems such as the large amount of deformation of the V-groove bottom I11, which has conventionally been a problem in the manufacturing method of ring-shaped V-pulleys, the accuracy of the inner diameter dimension of the V-groove bottom wall, and the wall thickness of the V-groove bottom wall. It completely solves the problem of limited accuracy.
It is designed to easily improve the accuracy of the inner peripheral dimension and wall thickness of the V-groove bottom wall to the desired accuracy, and is an improvement on the conventional V-boo manufacturing method. Its technical significance is highly evaluated.

The present invention is a further improvement of this type of sheet metal pulley, in which a bell-shaped material with a circular punched hole at the top is formed by punching and finishing a sheet metal material at the same time. The peripheral wall is made to stand up vertically, and the upper part of the raised side wall is corrugated outward to form a pulley molding material. This pulley molding material is then subjected to a series of compressive deformations to form a ring-shaped finished product. The structural feature of Part 7 is to manufacture V-pulleys, and in addition to making the wall thickness of the finished V-pulley uniform and improving the groove accuracy, the material used for one pulley is used as a side dish. The purpose of this invention is to save money and reduce material costs, and to provide a method for manufacturing a V-pulley in the form of a lug/gang, which also meets today's social demands for resource and energy conservation.

An embodiment of the present invention will be described below in order of manufacturing steps with reference to the accompanying drawings.

First, a circular steel plate l of a predetermined thickness as shown in Fig. 1 is deep-drawn, and at the same time, its central part is punched out into a circular shape.
As a result, a circular punched hole 2a is formed, and a bell-shaped material 2 is formed which has a punched hole 2a at its top as shown in FIG.

Next, the pre-drawn portion 2d of the side peripheral wall 2c of the bell-shaped material 2 formed in this way is pressed into a third shape.
As shown in the figure, the raised side circumferential portion 3a is made to stand vertically, and the upper part of the raised side circumferential portion 3a is also press-worked to create corrugations on the outside to obtain the pulley forming material 4. In this step, the pulley forming material The middle part of the side peripheral wall 4c of the material 4, that is, the part where the V-groove will be formed in a later step, is left unprocessed.

The pulley forming material 4 formed in this manner has a V-groove formed around its side peripheral wall 4C, and this V-groove forming is similar to that disclosed in Japanese Patent Publication No. 56-2 $162. It will be done according to the procedure.

That is, the pulley forming material 4 is supported from both end openings 4a and 4b by a well-known V-groove forming rotary support type (not shown) and a compressive force is applied in the axial direction. A rotary mold for V-groove molding (
(not shown) 1, thereby forming a predetermined V groove 5a around the circumference as shown in FIG. A rotary mold for edge shaping (not shown) is pressed against both edges and the edges are bent and shaped 6a, 6b in the axial direction to obtain a finished V-pulley 6.

Note that it goes without saying that the edge shaping performed in the final finishing step after forming the grooves may be performed simultaneously on both open edges 6a and 6b, or may be performed alternately on each end. It goes without saying that the effects of the present invention will not change even if the V-shaped groove shown in FIG. 5 is formed in advance during molding.

The present invention has been described above, but the present invention has the following effects.

(1) ■ Improved accuracy during groove forming.

According to the present invention, in the pre-process of forming the V@, the pulley forming material is made to have the openings at both ends, which become the side walls of the V groove, corrugated outward by pressing, etc., and the middle part, which becomes the bottom wall of the groove. Since this can be left as an unprocessed portion, the amount of deformation of the bottom wall portion of the V-groove during subsequent molding of the V-groove can be extremely small.

As a result, (1) the inner diameter of the bottom wall of the groove can be easily finished to the desired high precision required for fitting with the shaft member, and (2) the wall thickness of the bottom wall of the groove can be finished to the desired precision. This improves overall accuracy during V-groove forming.

(2) Material costs are significantly reduced.

Like the manufacturing method disclosed in Japanese Patent Publication No. 56-28612,
After deforming the sheet metal material into a cup shape, the bottom part is cut down to the end of the peripheral wall and the pulley forming material is punched out and simultaneously deep drawn into a conical shape to form the pulley forming material. Therefore, the part to be discarded as scrap is limited to the part in which the punched hole was formed in the sheet metal.

Therefore, there is a corresponding savings in material costs, which is a significant savings compared to conventional methods for manufacturing a boob of the same size. For example, according to the applicant's experiments, V pulleys were manufactured using 1720 sheet metals, while 15
It can be manufactured from a sheet metal of 20 mm in size, resulting in a significant reduction in production costs when producing V-pulleys in large quantities.

(3) ■ The thickness of the pulley can be made uniform.

Instead of deforming the sheet metal material into a cup shape, which is likely to result in thinning, the sheet metal material is immediately punched and conically drawn to form a bell-shaped material, and this bell-shaped material is then subjected to a series of compression deformation processes to create the final V-pulley. Because of this, the thickness of the V-pulley can be made uniform.

[Brief explanation of the drawing]

The drawings are all cross-sectional views showing the steps for deforming the material according to the manufacturing process of the present invention, and it is understood that the V-pulley is manufactured as a finished product through the steps starting from Figure 1 and shown in Figure 6. This is what is shown. (Explanation of symbols) 1. Disk-shaped sheet metal material, 2. Bell-shaped material, 2a. Circular punched hole, 4. Pulley forming material, 5a, 6a -- V groove patent applicant Konko Doko Welding Co., Ltd. agent patent attorney
Takashi Suzue - i;> 1 1J Figure 2 Figure 3 Figure 6 Revocation of procedural amendments Kazuo Wakasugi, Commissioner of the Patent Office 1, Indication of the case Patent application No. 1983-046995 2, Name ring of the invention Manufacturing method for V-pulleys 3. Relationship with the case of the person making the amendment. Patent applicant Konko Doko Welding Co., Ltd. 4. Agent 5. Date of amendment order. 1) ``4. The line ``The drawings are as shown...'' in the ``Explanation'' column should be amended to read as follows. The drawings are all cross-sectional views showing the deformation procedure of the material in each manufacturing process of the method of the present invention. A vertical cross-sectional view of a bell-shaped material formed by deep drawing the sheet metal material shown in the figure.
Fig. 3 is a vertical cross-sectional view of a bell-shaped material with a vertically erected side wall, and Fig. 4 is a vertical cross-sectional view of the bell-shaped material shown in Fig. 3, obtained by corrugating the side wall of the material shown in Fig. 3 outward. FIG. 5 is a vertical cross-sectional view of the pulley forming material shown in FIG. 4, with a V-groove provided on the side peripheral wall of the pulley forming material shown in FIG. It is a longitudinal cross-sectional view of a V-boot which is a completed product obtained by bending both edges of the pulley forming material shown.

Claims (1)

[Claims] A disk-shaped sheet metal material is punched and deep-drawn at the same time to form a bell-shaped material with a circular punched hole at the top.The side wall of this bell-shaped material is made to stand up vertically, and then this raised A pulley molding material is formed by expanding the upper part of the side peripheral wall outward, and while compressing this pulley molding material in the axial direction, a rotary mold for V-groove molding is pressed against the side peripheral wall of the molding material to form a predetermined shape. A ring-shaped V having a V-groove around the circumference, and further shaping the edge of the pulley forming material around the V-groove.
How to manufacture pulleys.