JPS6011823B2 - Metal chassis for audio equipment, etc. and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal chassis for audio equipment and a method for manufacturing the same.

Conventionally, metal chassis for audio equipment, etc. are manufactured by separately press-forming the chassis body and chassis members such as component mounting plates using appropriate flat plate members, and then combining the chassis body and chassis members to complete the chassis. This required a large number of flat plate members, and the chassis body and chassis parts were press-formed separately, which made workability difficult.Furthermore, the chassis body and chassis parts were managed as separate pieces. The drawback was that parts management was very difficult.

The present invention aims to improve such conventional drawbacks, and will be described below with reference to the drawings.

(First step) A flat plate member is punched and bent and pressed to provide a perforation la (a mounting hole for a power transformer, etc.) in the chassis body 1 as shown in FIG. A chassis member (such as a component mounting plate) 2 connected to a chassis body 1 is integrally formed.

(Second process) While drawing and pressing the two parts of the chassis member,
1 at the boundary between the chassis body 1 and the chassis member 2
By applying shear press processing to the remaining portions 4, 4, 4, except for the connecting portions 3, 3, the chassis member 2 is made to protrude downward (or upward) from the chassis body 1, as shown in FIG. , and holds the chassis member 2 in a state connected to the chassis body 1 via the connecting parts 3, 3.

In this process, the connecting parts 3, 3 are elongated by drawing press processing, so the metal structure becomes coarse and fatigue deteriorates.
Bending strength decreases. (Third step) Pressing is performed again to compress the connecting portions 3, 3 as shown in FIG. 3, and return the chassis member 2 to its original position, i.e.,
The cut end surfaces of the cut portions 4, 4, 4 are returned to positions where they are close to each other or support each other.

Through this third process, the metallographic structure of the connecting parts 3, 3 undergoes fatigue deterioration to a state at or close to the breaking limit, and the metallographic structure of the connecting parts 3, 3 is destroyed by manual bending several times, and the chassis member 2 can be separated from the chassis body 1. In the metal chassis manufactured through the above process, the chassis member 2 is connected to the chassis body 1 through the connecting parts 3, 3 whose metal structure has deteriorated due to fatigue. The member 2 can be separated from the chassis body 1 by bending it several times and assembled with the chassis body 1 to produce a finished chassis, making it easy to work with. If the separation is performed on a vertical line, work efficiency will be further improved.

Furthermore, since it can be managed as one piece, parts management becomes easier. In addition, since such a metal chassis can be easily manufactured by continuous automatic feed press processing, it has good workability and is suitable for mass production.Furthermore, the Miyakomura of the perforated portion la of the chassis body 1 is used as the chassis member 2, making it possible to effectively use a flat plate member. It has excellent practical advantages such as low material cost.

[Brief explanation of the drawing]

1 to 3 are diagrams showing a metal chassis for audio equipment, etc., and a manufacturing method thereof according to the present invention. 1 is the chassis body, la is the perforation part, 2 is the chassis member,
3 is a connecting portion. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A metal chassis for audio equipment, etc., characterized in that a chassis member 2 is integrally formed in a perforated portion 1a of a chassis body 1 via one or more connecting portions 3 whose metal structure has deteriorated due to fatigue. . 2. A method for manufacturing a metal chassis for audio equipment, etc., comprising each of the following steps (a) to (c). (a) A step of providing a perforation 1a in the chassis body 1 and integrally forming a chassis member 2 connected to the chassis body 1 in the perforation 1a. (b) At the boundary between the chassis body 1 and the chassis member 2, leave one or more connecting portions 3 and cut the other portions, extend the connecting portions 3, and connect the chassis via the connecting portions 3. A step of holding the member 2 in a state connected to the chassis body 1. (c) A step of compressing the connecting portion 3 and returning it to a position where the cut end surfaces of the chassis member 2 and the chassis body 1 are close to each other or in contact with each other.