Semi-finished product to be wrought from a ductile material separates into two sections with defined surface fractures.

摘要

Between the tips (2a,2b) of a pair of wedge-shaped longitudinal grooves (2,3) worked up without cutting there is a thin bridge (4) left that can be easily broken off with little force without deforming it by cutting. The depth (d) of the bridge is small in comparison with the depth (D) of a semi-finished wrought product (1) so that the thin bridge can be easily broken off.