Wear on Shearing Tools : (Wear on Cutting Edges of Blanking Tool for Square Parts)

Abstract

In blanking, many factors influence tool wear. In this report, the authors investigated how the wear on cutting edges of blanking tool increased with the number of parts blanked, and discussed how the wear influenced the blanking force, energy, dimensional accuracy, burr height, etc. (1) On the face of punch and die, crater wear occurred and changed gradually into crater-slope wear with the increasing number of parts blanked, but punch flank wear and die opening wear were slope wear and increased uniformly. (2) Die face wear was greater than punch face wear, but at the sharp corners punch face wear and punch flank wear were remarkable. (3) The blanking force scarcely increased with the number of parts blanked, but the blanking energy increased considerably. (4) Dimensions, burr height and dishing increased and the sheared surface became worse with the number of parts blanked.