Method and apparatus for manufacturing housings by press working

Abstract

To increase a thickness of a bent part on a root of a flange part, without upsetting processing the flange part which is bent outward from an opening of the housing.SOLUTION: A housing processing method is configured to form a flange part of a housing, comprising: a side wall part 22 surrounding an inner space; a bottom part 24 closing one opening of the side wall part; and a flange part 26 bent outward from the other opening of the side wall part, by press processing using a punch 32 and a die 34. In the press processing, the punch is arranged in the inner space side of the housing, the die is arranged on an opposite side of the inner space of the housing, and at least a part of the outer peripheral face of the side wall part is subjected to ironing to the flange side by the die, and the bent part is crushed from the side wall part to the flange part, namely crushing processing is executed.SELECTED DRAWING: Figure 6

Claims

1. A method for manufacturing a housing (20) having a side wall portion (22) surrounding the perimeter of the internal space, a bottom portion (24) closing one opening of the side wall portion, and a flange portion (26) bent outward from the other opening of the side wall portion, wherein the flange portion of the housing (20) is shaped by press working using a punch (32) and a die (34), The punch is positioned on the side of the housing that faces the internal space, and the die is positioned on the side of the housing that faces the internal space. In the aforementioned press working, at least a portion of the outer surface of the side wall is crushed by the die while simultaneously crushing the bent portion from the side wall to the flange, A method for manufacturing a housing by press working, wherein the radius of curvature from the inner circumferential surface of the side wall to the flange portion is reduced in the bent portion, thereby expanding the flat surface of the punch side of the flange portion.

2. A method for manufacturing a housing by press working according to claim 1, A method for manufacturing a housing by press working, wherein in the crushing process, the outer peripheral end of the flange portion is semi-restrained by a projection (32C) provided on the surface of the punch facing the flange portion.

3. A manufacturing apparatus for shaping the flange portion of a housing having a side wall portion surrounding the perimeter of an internal space, a bottom portion that closes one opening of the side wall portion, and a flange portion that is bent outward from the other opening of the side wall portion, by press working, A punch is positioned on the internal space side of the housing and extends from the bottom through the side wall to the flange, and is formed to correspond to the inner shape of the housing. A die is positioned on the opposite side of the housing from the internal space, and is formed to correspond to the outer shape of the housing, extending from the bottom through the side wall to the flange. Equipped with, A manufacturing apparatus comprising the punch and the die, wherein the side wall surfaces that sandwich the side wall portion of the housing by the press working are tapered in shape so that the internal space widens toward the flange portion, and at least a portion of the side wall surface of the die is straight in shape for a certain length from the tip of the flange portion toward the press.

4. A manufacturing apparatus according to claim 3, In the punch and die, the opposing surfaces that sandwich the flange portion of the housing by the press working are planar in shape parallel to the opening surface of the housing. A manufacturing apparatus wherein the opposing surface of the punch is provided with a projection lower than the thickness of the flange portion, and the projection is configured to semi-restrain the outer peripheral end of the flange portion during the press working process.

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