| 摘要 |
A drawing punch for use in drawing foils in a die which converges in the direction of drawing, comprises a rigid cone, and a cylindrical elastic body surrounding the core with a cavity around the core opening out of the end of the body facing the direction of drawing. A rigid support member is provided on the cone against which the other end of the body is supported. The radial cross-sectional area of the cylindrical elastic body increases from one end of the body to the other, and the peripheral surface of the body is at an angle ot the axis of the punch. As the drawing punch is forced into the die for drawing a foil, the vol. of the cavity becomes zero just before the end of the stroke of the punch.
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