| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem of a conventional press machine that breaking faces, shear droops, and burrs are easily formed on the worked face of a punched part. SOLUTION: In a press mechanism arranged with a punch and a die, the cutting edge of the die is rounded. The clearance between the punch and the die is set to <=1% of the thickness of a stock. A support fixture which supports the stock from below and moves vertically together with the stock in pressing by the punch is arranged. The cutting edge of the die of a progressive press machine is radiused.
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