Cutting procedure for cutting workpiece from sheet metal - uses die or matrix with projection which stretches sheet metal prior to cutting thus reducing cutting effort needed

摘要

The procedure, using two tools (2,4) which can move towards one another and are equipped with shearing edges (7,8), consists of locking the sheet metal workpiece (1) in place and subjecting it to an initial traction to reduce the cutting effort needed, and then cutting.The first of the two cutting tools (2) has a projection (10) which is situated at a certain distance from its shearing edge (7) and lying parallel to the tool's direction of travel. The projection can be made in one piece with the tool, which can be either the die or the matrix, and the ratio between the distance by which the projection is inset from the tool's cutting edge and the thickness of the projection is greater than 0 but less than 0.06 : 1. ADVANTAGE - Reduced effort required to cut workpiece.