Patent ID: 6119568
Filing Date: 2000-09-19
Classification: B21D,Y10T

Abstract:
A piercing apparatus comprising(a) a first rotation roller which is provided with a convex first cutter which is adapted to form ends and sides of a hole to be formed in a workpiece, said first rotation roller being provided with at least one recess formed on a part of the outer periphery of the first cutter;(b) a second rotation roller which is provided with a concave second cutter which is adapted to form sides of a hole to be formed in the workpiece when the workpiece passes between the first cutter and the second cutter, said second cutter being provided to engage with the first cutter to thereby form a hole in the workpiece passing between the first and second rotation rollers; and,(c) at least one cut chip discharge means provided on the second rotation roller so as to engage with said recess to thereby separate a cut chip from the workpiece when the cut chip discharge means is engaged in said recess.