B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
205/22
B21C 23/00 (2006.01) B21C 37/29 (2006.01) B21D 19/08 (2006.01)
Patent
CA 1086260
ABSTRACT: Method and apparatus for the extrusion of burr holes in a metal sheet, a punch with a conical end portion and adjoining cylindrical portion of a diameter which is greater than the liner burr diameter being passed through the burr, the conical end portion having a half apex angle between 10° and 20°, and the axial length 1 of the cylindrical por- tion, the coefficient of friction m between said por- tion and the burr wall and the ratio Image of the burr wall thickness Sk before the operation and the burr wall thickness Sv after the operation being selected so that: Image .
293307
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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