Patent ID: 6327884
Filing Date: 2001-12-11
Classification: B21D

Abstract:
Press brake tooling comprising a die and mating punch for bending sheet stock, said punch having an elongated, generally V-shaped punch tip and said die being of steel and having an elongated, generally V-shaped groove within which said punch tip is received during a bending operation, said groove having a floor and sidewalls extending from the floor and terminating in edges spaced from each other across the width of the groove, said edges having edge surfaces configured to slidingly encounter the surface of a workpiece as it is bent between the tool and die, at least said die edge surfaces being nitrided or nitrocarburized to provide a slippery surface over which a work piece may slide, said surfaces having a hardness in the range of 52-70 Rockwell C with said hardness extending to a depth not exceeding about 0.06 inches.