Method of blanking element for belt for continuously variable transmission

摘要

The cutting edge of a die and the cutting edge of a punch are spaced more widely from each other in a range of an element which includes a neck and undercuts than in the other range of the element. The element is blanked out of a metal sheet by the die and the punch. Edges of the neck and the undercuts are formed of a sheared surface in a transverse direction and a ruptured surface contiguous to the sheared surface. A burr is formed next to the ruptured surface in a position out of contact with endless rings.