METHOD FOR THE FABRICATION OF STIFFENING CORRUGATIONS IN THIN-WALLED, HARD SHEETS, ESPECIALLY OF CIRCUMFERENTIAL CREASE

摘要

Method of production of beads in thin-walled hard sheet, especially of circumferential creases in rotors of centrifuges, by means of a roller and a counter roller as the pressing tools which accomodate between them the material to be worked; the method includes pressing a roof-shaped groove into the hard material within its limits of plastic deformation and then superimposing on the roller an oscillatory motion at right angles to the groove for broadening the groove at right angles to its direction of extension.