KR20080088843A - Manufacture method of automobile belt pulley - Google Patents

Abstract

A method for manufacturing an automobile belt pulley is provided to reduce manufacturing costs and increase quality of shake of a rotary body by forming belt guides and belt grooves on an outer surface of the outer pipe body through a plurality of forging processes. A method for manufacturing an automobile belt pulley comprises the steps of: blanking a preparatory steel sheet material(1) through repeated forging processes and preparing for the material having a circular through hole(10) which is to be a shaft hole(11) in which a shaft is inserted; forming the shaft hole at the center of the material and forming an inner pipe body(20), an outer pipe body(30), and a connecting part(40); forming a bearing mounting part(12) and a bearing catching protrusion(12') by expanding depth of the shaft hole; 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 of the manufacturing process sequence according to an embodiment of the present invention

3 is a cross-sectional view of the manufacturing process sequence according to another embodiment of the present invention

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

1: material 1a: belt pulley

10: through 11: air

12: bearing seat 12 ': bearing locking jaw

13, 13 ': Belt guide 14: Belt groove

20; Inner Tube Body 30: Outer Body Body

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, and the like, more specifically an automobile by a stepped cold forging using an iron plate. By manufacturing a pulley for the purpose of providing a one-piece pulley with a single rotor and belt groove, it is possible to reduce the cutting process and improve the durability of the pulley.

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 to be able to improve the quality of the shake (shake) of the rotating body.

The present invention is characterized in that the belt groove is completed by a rolling or processing step of preparing a material of a predetermined size by blanking the steel sheet (BLANKING) and several forging steps thereafter. The detailed method and configuration are as follows.

1 is a process flow chart according to the present invention, Figure 2 is a cross-sectional view of the manufacturing process sequence according to an embodiment of the present invention, Figure 3 is a cross-sectional view of the manufacturing process sequence according to another embodiment of the present invention.

Blanking process

Blanking the prepared steel sheet to prepare a material 1 is formed in a circular through-hole 10, which will be a circular hole in the center and the shaft is inserted later in the center.

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

By folding the edge portion of the material 1 and the edge thickness portion of the through hole 10, the shaft hole 11 is formed at the center, and the inner tube portion 20, the outer body portion 30, and the connecting portion 40 are formed.

Secondary forging process

By only expanding a predetermined depth of the shaft hole 11 is formed so that the bearing seating portion 12 and the bearing engaging jaw (12 ') is formed.

After completing the secondary forging process as described above, it is completed by means of completion of two methods, one of which is

Trauma side forging process

 The belt guide 13 is formed by forging at the upper end of the outer surface of the intermediate product processed by the secondary forging process.

Outer and lower side forging process

The intermediate product is turned over to form a belt guide 13 'at the outer and lower ends.

Belt Groove Forming Process

A belt groove 14 is formed between the two belt guides 13 and 13 'formed above to complete the belt pulley 1a. The belt groove 14 may be completed by mechanical cutting. Alternatively, it can be completed by rolling.

After the secondary forging step is completed, another method of not performing the outer and outer forging steps as described above,

Belt guide and Belt groove  Co-forming process

It is a process of forming the belt guides 13 and 13 'and the belt groove 14a through the mechanical cutting process or the rolling process to the intermediate product which completed the secondary forging process.

  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 manufacture of the belt pulley for automobiles using cold forging is completed, there is no waste of cost and time due to heating during hot forging, the dimensions of the product is accurate, hardness increase by hardening, reduction of elongation Durability will be further improved according to the characteristics of cold forging such as.

In addition, the belt pulley is completed by two forging processes, belt guide forming process, and one rolling or machining process, so manufacturing is completed very quickly. Advantages of minimizing cutting and minimizing material waste There is this.

In the present invention, the belt pulley is manufactured through a total of two forging processes or two forging processes, but the belt guide forming process may be reduced according to the shape of the product to make a product.

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 an automobile belt pulley by welding and separating the two rotor parts, the invention can be said to be a useful invention that can manufacture an automobile belt pulley with a simple process and low cost.

Claims (3)

In the method for manufacturing a pulley for an automobile in which the inner tube body and the outer body portion is formed through a step-by-step plastic processing of the material having 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; The shaft hole 11 is formed at the center by flipping the edge portion of the material 1 and the edge thickness portion of the through hole 10, and at the same time, the inner tube portion 20, the outer shell portion 30, and the connecting portion 40 are formed. Secondary forging process; A secondary forging process in which the bearing seating portion 12 and the bearing engaging jaw 12 'are thereby formed by expanding only a predetermined depth of the shaft hole 11; Forming belt guides (13) (13 ') and belt grooves (14) on the outer surface of the exterior body portion (30); A step of completing the manufacturing of the belt pulley 1a through finishing cutting and painting as a finishing step; Method for manufacturing a belt pulley for cars, characterized in that consisting of. The method of claim 1, The belt guides 13 and 13 'are formed through a separate forging process, respectively, to form the belt grooves 14 or to simultaneously form both the belt guides 13 and 13' and the belt grooves 14. Method for manufacturing a belt pulley for an automobile characterized in that. The method according to claim 1 or 2, In the process of forming the belt guide (13) (13 ') and the belt groove (14), the manufacturing method of the belt pulley for automobiles, characterized in that the processing by mechanical cutting or rolling.

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