KR20080088845A - Manufacture method of automobile belt pulley - Google Patents

Abstract

A method for manufacturing an automobile belt pulley is provided to finish the belt pulley rapidly and minimize cutting processes by two times of forging processes and a rolling or mechanical process. A method for manufacturing an automobile belt pulley comprises the steps of: blanking a preparatory steel sheet material(1) by considering a size of the belt pulley, plural times of forging processes, and the processed level, and preparing for the material having a circular through hole(10) which is to be a shaft hole in which a shaft is inserted; forming a bottom surface(11) by reducing thickness of the material, forming an outer pipe body(30) at an edge, and expanding a center through hole to form a shaft hole(20); pushing down the edge of the shaft hole to form a shat hole body(20'); forming belt guides(13,13') and belt grooves(14) on an outer surface of the outer pipe body; and finishing a belt pulley(1a).

Description

Manufacturing method of automobile belt pulley

1 is a process flow chart according to the present invention

2 is a cross-sectional view according to the process sequence according to the present invention

*** Description of the symbols for the main parts of the drawings ***

1: material

1a: belt pulley

10: through

11: bottom

13, 13 ': Belt Guide

14: belt groove

20: axes

20 ': shaft pipe body

30: exterior body part

40: connection

The present invention relates to a method for manufacturing a belt pulley, such as a compressor pulley for an air conditioner, a cooling pump driving pulley, a generator pulley, a power handle pulley for use in an automobile, and more specifically, an air conditioner pulley by cold forging step by step using an iron plate. The aim is to provide automotive belt pulleys with a simple process and low cost, while reducing cutting and improving pulley durability.

As is well known, automobiles include air conditioner compressors (compressors), coolant pumps, generators, and power steering hydraulics that operate by receiving the engine's rotational power. It consists of a pulley.

Referring to the conventional belt pulleys for cars, the conventional rota and belt groove parts are manufactured separately and joined by a welding method, or by manufacturing a shape by casting to manufacture a belt groove, such a conventional manufacturing method According to the present invention, the manufacturing process is complicated and takes much time and cost in the amount of processing, and there is a problem that cracks easily occur in a portion where stress is high during hot forging, and a high probability of corrosion occurs.

In addition, since there are many parts to be cut by processing, there is also a problem that a considerable waste of material is followed and the manufacturing cost is unnecessarily increased.

The present invention devised in view of the above problems is to provide a manufacturing method for manufacturing a belt pulley for automobiles using a relatively simple cold forging process using a steel sheet and by providing a belt pulley according to such a method, while reducing the cost of manufacturing and durability And it aims at being able to improve the quality of shake of a rotating body.

The present invention is characterized in that the belt groove is completed by a blanking or a forging process followed by a process of preparing a material of a predetermined size as a blanking (BLANKING), and then, in the accompanying drawings. The detailed method and configuration are as follows.

1 is a process flowchart according to the present invention, Figure 2 is a cross-sectional view according to the process sequence according to the present invention.

Blanking process

Blanking the prepared plate to prepare a material (1) having a circular through-hole 10, which will be a circular hole in the center and a shaft inserted later in the center as a whole.

At this time, the thickness and the external dimensions of the material 1 are appropriately sized in consideration of the size of the belt pulley 1a to be manufactured and the degree of processing such as forging several times.

1st forging process

The bottom surface 11 is formed while reducing the thickness of the material 1, and the exterior body portion 30 is formed at the edge portion, and the shaft hole 20 is formed while expanding the central through hole 10.

Secondary forging process

While further reducing the thickness, the edge of the shaft hole 20 is pushed down so that the shaft tube body 20 'is formed.

Belt guide and belt groove forming process

After completing the secondary forging process as described above is completed through the two means of completion, one method of the belt guide 13, 13 'and the belt groove 14 through the mechanical cutting process In another method, the belt guides 13 and 13 'and the belt groove 14 are formed by rolling.

After such a process, the finishing of the belt pulley 1a is completed through other finishing processes such as finishing cutting and painting.

The present invention has such a configuration that the manufacturing of the belt pulley for the automobile is completed by using cold forging, there is no waste of cost and time due to heating during hot forging, the dimensions of the product is accurate, the hardness increase due to work hardening, elongation reduction Durability will be further improved according to the characteristics of cold forging such as.

In addition, since the belt pulley is completed by two forging processes and one rolling or machining process, the manufacturing is completed in a very quick time, and there is an advantage of minimizing cutting to minimize waste of materials.

In the present invention, the belt pulley is manufactured through a total of two forging processes, but considering the characteristics of forging or forging in which the degree of workability is changed in one action depending on the performance of the forming machine or the material of the material. The process can be completed by adding or reducing the number of operations.

According to the present invention as described above, because the belt pulley is manufactured through cold forging, which is excellent in durability and relatively simple process, it is possible to prevent waste of materials while reducing the process. Compared to the method of manufacturing a belt pulley by welding and separating the two parts separated from the rotor part, the invention can be said to be a useful invention that can manufacture a belt pulley for automobiles with a simple process and low cost.

Claims (3)

In the method for manufacturing a pulley for an automobile through a step-by-step plastic processing of the material with a circular through hole in the center, In consideration of the size of the belt pulley to be manufactured and the degree of forging and processing several times, the prepared steel plate material (1) having a thickness and an outer dimension is blanked to be circular in its entirety and at the center to be a shaft hole into which a shaft is inserted later. A blanking process for preparing the material 1 on which the through hole 10 is formed; A primary forging step of forming the exterior body portion 30 at the edge portion while reducing the thickness of the material 1 to form the bottom surface 11, and forming the shaft hole 20 while expanding the central through hole 10; A secondary forging step of allowing the edge of the shaft hole 20 to be pushed downward while the thickness thereof is further reduced to form the shaft tube body 20 '; Forming belt guides (13) (13 ') and belt grooves (14) in the exterior body portion (30); A step of completing the manufacture of the belt pulley 1a after finishing cutting and painting; Method for manufacturing a belt pulley for cars, characterized in that consisting of. The method of claim 1, Belt guide (13) (13 ') and the belt groove 14 is a method for manufacturing a belt pulley for an automobile, characterized in that formed through mechanical cutting. The method of claim 1, Belt guide (13) (13 ') and the belt groove 14 is a method of manufacturing a belt pulley for an automobile, characterized in that formed through a rolling process.

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