method for selbsttaetigen manufacture of durchbruechen on ceramic or similar koerpern

摘要

Automatic prodn of cut-outs in ceramic bodies by stamping when these bodies have the hardness of leather by providing means for preventing the stamped out mass adhering to the punch and preventing deterioration of the edge of the stamped-out opening. In partic. the punch drives the stamped out mass beyond the inner wall of the ceramic body and into the die where it is retained by suitable means such as points.