WO2016072715A1

WO2016072715A1 - Method of manufacturing motor case for automotive clutch shift motor

Info

Publication number: WO2016072715A1
Application number: PCT/KR2015/011725
Authority: WO
Inventors: 임귀성; 이영계; 김현수; 윤석민; 정경현; 차동원; 박경도
Original assignee: (주)태화기업
Priority date: 2014-11-03
Filing date: 2015-11-03
Publication date: 2016-05-12
Also published as: KR20160051382A; KR101650247B1

Abstract

A method of manufacturing a motor case according to the present invention relates to a method of manufacturing a motor case comprising a cylindrical main body, a bearing portion formed projecting at the top of the main body, and a coupling portion formed projecting at the top of the bearing portion, and is characterized by comprising: a drawing step of forming a circular metal plate into a round cup shape; a redrawing step of increasing the height of the round cup shape and reducing the diameter thereof and simultaneously forming the bearing portion into a rounded shape; a first top drawing step of reducing the diameter of the shape of the bearing portion and forming a top flat part that is flat around the bearing portion; a second top drawing step of forming the shape at the top of the coupling portion to project from the top of the bearing portion; a first top piercing step of forming a small hole in the top of the coupling portion; and a burring step for enlarging the shape of the coupling portion in which the small hole has been formed.

Description

Manufacturing method of motor case of automobile clutch shift motor

The present invention relates to a method of manufacturing a clutch shift motor case for an automobile. More specifically, the present invention relates to a method of manufacturing a clutch shift motor case for an automobile that can manufacture a motor case that requires precise dimensions while being manufactured by continuous press working.

In general, there are various types of transmissions of automobiles, and most transmissions include shifting devices of transmissions. A clutch shift motor is used for the shift device. Such a transmission and a clutch shift motor are disclosed in Korean Patent Publication Nos. 10-2006-0065508 and 10-2010-0093094.

The motor case used for the clutch shift motor has various forms, but the present invention relates to a method of manufacturing a motor case having the structure of FIG. Referring to FIG. 1, the motor case 100 is formed on a cup-shaped body portion 101, a bearing portion 102 which is a space into which a bearing is inserted in an upper portion of the body portion 101, and an upper portion of a bearing portion 102. And an engaging portion 103 whose upper portion is open, and a lower flange portion 104 formed around the lower portion of the main body portion 101. The first step portion 101a and the second step portion 101b are formed on the side surface of the main body portion 101, and the upper flat portion 101c is formed around the bearing portion 102 on the upper portion of the main body portion 101. Formed. The lower flange part 104 is provided with a hole 104a for fixing the motor case 100.

A conventional method of manufacturing such a motor case 100 will be described with reference to FIG. 2. Referring to FIG. 2, a process of manufacturing the motor case 100 while passing through each step by a continuous pressing process is illustrated as a cutaway view. First, a circular thin metal steel sheet is drawn into the rough shape of the main body portion 101 in the first step (FIG. 2A). In the next step, the body portion 101 is processed to a higher shape while reducing the diameter (Fig. 2 (b)). In the next step, the bearing portion 102 and the engaging portion 103 are convexly drawn upwards and at the same time the side stepped shape is processed (Fig. 2 (c). Then, the repetitive drawing process (Fig. 2 ( d), (e), (f)) and the trimming process (Fig. 2 (g)), the list-writing process to determine the dimensions (Fig. 2 (h)), and the upper part of the coupling portion 103 perforated and It consists of a piercing process (FIG. 2 (i)) which forms the hole 104a of the flange part 104 simultaneously.

According to such a conventional manufacturing process, since the upper flat portion 101c is determined from the top drawing process of FIG. 2 (c), a round band is formed on the upper flat portion 101c every time the subsequent drawing process is performed. do. Due to this band, the flatness (roughness) of the upper flat portion 101c is difficult to be secured to a precise level. In addition, the parallelism or plan view of the circumference of the bearing portion 102 is also difficult to ensure a precise level. In addition, since the degree of the rounded portion R is large at the connection portion between the bearing portion 102 and the coupling portion 103 or the upper flat portion 101c and the main body portion 101, chips are generated during further processing. There is a problem. In the case of the recent clutch motor, when the coupling is coupled to the transmission, the sealing must be made perfectly so that oil does not leak out. According to the conventional method, the roughness or parallelism has a limitation that is difficult to be processed to a precise level.

In order to solve the above problems, the present inventors propose a new process that can be processed to precise dimensions so that the roughness and parallelism can be precisely maintained.

It is an object of the present invention to provide a motor case manufacturing method of a clutch shift motor for an automobile in which the roughness and parallelism of the bearing portion, the coupling portion, and the upper flat portion of the motor case can be secured precisely.

The above and other inherent objects of the present invention can be easily achieved by the present invention described below.

In the manufacturing method of the motor case according to the present invention, in the manufacturing method of the motor case consisting of a cylindrical body portion, a bearing portion protruding on the upper portion of the body portion and a coupling portion protruding on the bearing portion,

A drawing step of forming a circular metal plate into a round cup shape;

A re-drawing process of reducing the diameter while increasing the height of the round cup shape and simultaneously shaping the shape of the bearing part into a round shape;

A first top drawing step of forming an upper flat portion having a flat shape around the bearing portion while reducing the diameter of the bearing portion;

A second top drawing step of convexly forming a shape of the coupling part on the top of the bearing part;

A first tower piercing process of forming a small hole in an upper portion of the coupling portion; And

Burling process for determining the shape of the engaging portion in which the small hole is formed;

Characterized in that consists of.

In the present invention, after the burring process may further include a restriking process of determining the final shape and dimensions of the motor case.

In the present invention, the second top piercing step of forming a hole having the same size as the inner diameter of the coupling portion in the upper portion of the coupling portion so as to open the upper portion of the coupling portion after the burring process.

In the present invention, it is preferable to simultaneously process the shape of the first stepped portion formed around the main body portion in the redrawing step.

In the present invention, the shape of the first stepped portion may be further processed simultaneously by reducing the diameter of the lower portion of the first stepped portion in the second top drawing step.

In the present invention, it is preferable to form the small hole in the first top piercing process and simultaneously mold the second stepped portion 101b at a lower distance from the lower portion of the first stepped portion.

The present invention has the effect of providing a motor case manufacturing method of a clutch shift motor for an automobile in which the roughness and parallelism of the bearing portion, the coupling portion, and the upper flat portion of the motor case can be secured precisely by continuous press working.

1 is a perspective view showing a motor case of a clutch shift motor for an automobile.

2 is a conceptual diagram illustrating a method of manufacturing a motor case of a clutch shift motor for automobiles according to a conventional process.

3 is a conceptual diagram illustrating a method of manufacturing a motor case of a clutch shift motor for a vehicle according to the present invention.

Figure 4 is a perspective view showing each step of the manufacturing method of the motor case of the clutch shift motor for automobiles according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

3 is a conceptual diagram showing, in a sectional view, each step of the method of manufacturing a motor case of a clutch shift motor for automobiles according to the present invention, and FIG. 4 is a perspective view of each step.

As shown in Figs. 3 and 4, the manufacturing method of the motor case according to the present invention starts by supplying a circular metal plate to a press apparatus capable of continuous press working. The supplied metal sheet is processed into a round bowl shape in the first step (a) drawing process. The configuration of the press including the shape of the punch or the mold for drawing processing is a part that can be easily implemented and implemented by those of ordinary skill in the art will not be described in detail.

The second step (b), the redrawing process is a step of reducing the overall diameter while increasing the height (depth) of the body portion 101. At the same time, the rough shape of the first stepped portion 101a is processed while making a shape that protrudes roundly to the upper portion of the main body portion 101 for the formation of the bearing portion 102. At this time, the circumference of the round part protruding to the upper part of the main body part 101 and the part connected to the upper part of the side part of the main body part 101 give round shape, and forms the connection site | part. Here, the inner diameter of the body portion 101 of the lower portion of the first step portion is formed slightly larger than the inner diameter of the corresponding portion of the final product, the inner diameter of the body portion 101 of the upper portion of the first step portion is the inner diameter of the portion of the final product It is formed slightly smaller.

The third step (c), the first top drawing process, performs a drawing process again on the product processed in step (b), thereby forming a convex shape from the top of the main body portion 101 for forming the bearing portion 102. This is a step of forming the upper flat portion 101c around the bearing portion 102. In step (c) the outer diameter of the portion projecting upwards to have an approximate shape of the bearing portion is largely made to be the same as or smaller than the outer diameter dimension of the final bearing portion. The very small dimension here refers to a range with an error of around 5 on a 1/100 millimeter level. In step (c), the inner diameter of the body portion 101 below the first stepped portion and the inner diameter of the body portion 101 above the first stepped portion are maintained as in the case of step (b).

The fourth step (d), the second top drawing process, forms the protruding portion back to the top to form the coupling portion 103 at the protruding portion of the motor case processed in the step (c), and at the same time, the main body portion. (101) It is a step of processing the shape of the first step portion (101a) by reducing the diameter of the lower portion. In the present step (d), the shape of the coupling portion 103 protruding upward from the bearing portion 102 by the drawing process for the shaping of the coupling portion 103 formed in the upper portion of the bearing portion 102 is shown. Mold. In addition, the process of reducing the R value of the connecting portion between the upper flat portion 101c and the upper portion of the main body 101 is performed, and at the same time, the diameter of the lower portion of the lower portion of the main body 101 is reduced and the lower flange portion 104 and the main body portion 101 are formed. ) Also decreases the R value of the lower linking site.

In step (d), the shape of the bearing portion is drawn and the shape of the first stepped portion 101a is processed. After the processing of step (d), the body portion 101 under the first stepped portion is processed. The inner diameter of is smaller than that in step (c), that is, after the processing in step (c), and at the same time the inner diameter of the main body portion 101 above the first stepped portion is maintained as in the case of step (c). The outer diameter of the engaging portion 101 is formed smaller than the outer diameter of the engaging portion 101 of the final product.

In the fifth step (e), the first top piercing process is a step of forming a small hole in the upper portion of the coupling portion 103 and simultaneously molding the second step portion 101b. The size of the hole formed in the upper portion of the coupling portion 101 is not particularly limited, but preferably about 1/3 of the outer diameter of the bearing portion 102. This hole serves to disperse the stress concentrated when the size of the coupling portion 103 is determined in a future step and to be processed to precise and accurate dimensions.

The second stepped portion 101b is formed at a lower portion of the first stepped portion 101a at a predetermined interval. The second stepped portion 101b is formed by increasing the diameter of the lower portion of the main body portion 101 through the shape of the punch or mold used in the first top piercing process in step (e). Simultaneously with this molding, the shape of the first stepped portion 101a is also more accurately determined. In addition, the inner diameter of the lower portion of the first stepped portion 101a and the upper portion of the second stepped portion 101b may be reduced by several tenths of millimeters as compared with the step (d). In step (e) the inner diameter of the bearing portion 102 remains the same as in step (d). The first stepped portion 101a or the second stepped portion 101b may be omitted depending on the requirements of the product.

The sixth step (f) is a step of deburring (fining) the shape of the connecting portion 103 in the part with the small hole formed in the first piercing process of step (e). In the burring process, the dimensions or shapes of the other parts except the joints are maintained as in the previous step (e).

The seventh step (g) is a restriking process that establishes the final shape and dimensions of the product. In step (g), dimensions and shapes of the main body portion 101, the bearing portion 102, the first and second stepped portions 101a and 102b, the engaging portion 103, and the like are determined as the final product.

Eighth step (h) is a trimming process for forming the shape of the lower flange 104. In the trimming process, an unnecessary portion of the lower flange portion 104 is cut out and processed into the required shape of the lower flange portion 104. At the same time, the hole 104a necessary for the lower flange part 104 is formed by a piercing process. As in each step, trimming and piercing can be performed simultaneously in one process by changing the structure of the mold or punch of the press apparatus.

The ninth step (i) is a second top piercing process, in which a hole having a size corresponding to the inner diameter of the coupling part 103 is formed in the coupling part 103 so that the upper part of the coupling part 103 is opened. The second top piercing process may be performed by changing the order of the previous step (h).

It should be noted that the detailed description of the present invention described above is merely illustrative for the purpose of understanding the present invention and is not intended to limit the scope of the present invention. It is intended that the scope of the invention be defined by the claims appended hereto, and all simple variations or modifications of the invention within this scope should be understood as falling within the scope of the invention.

Claims

In the manufacturing method of a motor case comprising a cylindrical body portion, a bearing portion protruding on the upper portion of the body portion and a coupling portion protruding on the bearing portion,

A drawing step of forming a circular metal plate into a round cup shape;

A redrawing process of reducing the diameter while increasing the height of the round cup shape and simultaneously shaping the shape of the bearing part into a round shape;

A first top drawing step of forming an upper flat portion having a flat shape around the bearing portion while reducing the diameter of the bearing portion;

A second top drawing step of convexly forming a shape of the coupling part on the top of the bearing part;

A first tower piercing process of forming a small hole in an upper portion of the coupling portion; And

Burling process for determining the shape of the engaging portion in which the small hole is formed;

Method for producing a motor case, characterized in that consisting of.
The method of claim 1, further comprising a restriking process of determining the final shape and dimensions of the motor case after the burring process.
The motor case of claim 1, further comprising a second top piercing process of forming a hole having a size equal to the inner diameter of the coupling part in the upper part of the coupling part such that an upper portion of the coupling part is opened after the burring process. Method of preparation.
The method of manufacturing a motor case according to claim 1, wherein the shape of the first stepped portion formed around the main body portion is simultaneously processed in the redrawing step.
The method of manufacturing a motor case according to claim 5, wherein the small step is formed in the first top piercing step and the second step portion 101b is formed at a lower distance from the lower portion of the first step portion. .