JPS5545588A - Manufacture of cylindrical body with flange or flare - Google Patents

Abstract

PURPOSE: To obtain the captioned product of high precision, by pressing the punch into the cylindrical material in order to expand the cylindrical material and also performing stroke working of the inner circumferential surface, after inserting the cylindrical material of thin and both end opening type, in which a flange or a flare is formed at one end, and fitting it to the upper edge of the dies.

CONSTITUTION: The clearance between the dies 1 and the punch 2 is set to such diemensions as the sufficient stroking amount to absorb variations of the outer diameter or the inner diameter size of the cylindrical material W to be worked can be provided to the material. The thin and both end opening type cylindrical material W in which the flare 3 is formed at one end is inserted into the dies 1 in the state that the flare 3 is set to the upper side, and simultaneously the flare 3 fitted to the upper marginal part of the dies 1. Subsequently, when the puch 2 is pressed into the material W, the cylindrical material W is expanded toward the outside from the inside with the punch tip, and at the same time it receives the compression load followed by plate thickness stroking in the direction of the plate thickness, therefore the material W is yielded in the state that the inner diameter of the dies 1 and the outer diameter of the punch 2 are matched, and is finished to high precision, having few variations of the inner and outer diameter.

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