| 摘要 |
<p>Press brake tooling comprising a die (10) and mating punch (12) for bending sheet stock, the punch having an elongated, generally V-shaped punch tip (26) and the die being of steel and having an elongated, generally V-shaped groove (16) within which said punch tip is received during a bending operation. The V-shaped groove (16) of the die (10) has a floor and sidewalls that extend from the floor and terminate in edges that are spaced from each other across the width of the groove (16). The edges (22) have surfaces that are configured to slidingly encounter the surface of a workpiece as it is bent between the tool and die. At least the die edge surfaces are nitrided or nitrocarburized to provide a slippery surface over which the workpiece slides during a bending operation, the edge surfaces having a hardness in the range of 52-70 Rockwell C with such hardness extending to a depth not exceeding about 0.06 inches.</p> |
