| 摘要 |
PURPOSE:To form the punch for metallic plastic work increasing the strength and wear resistance by forming the hollow opening to the base end side on the main body core part of a punch kind. CONSTITUTION:The main body A of a punch is made by providing a flange part 4 on the base end part with the head part 1 in conical shape with a head making the tip center point P of the bar like base metal of a special steel, etc. in small projection shape. The distance with the tip of the head part 1 is provided in the direction of the head part 1 from the base end part of this main body A and the hollow 2 opening at the base end part is provided as well. At least four small holes 6 opening with communicating with the hollow 2 are pierced by changing the position in the longitudinal direction on the tip part of the side face of the punch main body A and made in the state of the inner and outer communicating. The punch for metallic plastic work having high work performance and long life is formed by subjecting to a heat treatment on the punch main body A thereof under the prescribed conditions.
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