METHOD FOR PRODUCING SHAPES WITH CIRCULAR CORRUGATIONS

摘要

METHOD FOR PRODUCING SHAPES WITH CIRCULAR CORRUGATIONS Shapes with circular corrugations are produced by spinning a sheet metal blank under the action of oppositely directed deforming and backing forces. The invention consists in that the blank is given the configuration of an envelope of revolution with a continously diverging flare and is secured at the end nearest to the geometrical apex of the flare, and the circular corrugations are formed sequentially, in the direction from the smaller towards the larger diameter, by applying a concentrated deforming force to the inside surface of the blank, the deforming force being directed along the blank axis. The invention may be used at metal working plants where diaphragms, membranes, or other products capable of varying their configuration and lengthwise dimension are fabricated.