4 as the punch assembly <br> <br> bearing, and the outer mold handle assembly base shaft using an interference fit made P7 / h6, the length of the fitting portion of the handle on the mold should be in the bearing, the original coat Thickness, so that the lower part of the mold shank is installed inside the bearing and the outer part of the outer sleeve is protruded for riveting. The mold shank is made of 45 steel, and the quenching and tempering treatment is performed. After riveting, the lower end should be flattened, as shown in Fig. 2. In the bearing used as the die, the assembly of the outer casing and the die base is made of an interference fit H7/p6 made of a base hole. The depth of the fitting part on the mold base should be 1~1.5mm larger than the width of the inner bearing and the outer casing after machining to facilitate riveting. After the riveting, the upper end surface is to be flattened. As shown in Fig. 2a in Fig. 2b, the die can be fixed by the set screw without riveting, and the depth of the fitting portion on the die holder should be equal to the thickness of the processed die.
5 Conclusion <br> <br> waste using the bearing, the outer projection for punching die, die, both turning waste, but also saves prices high carbon tool steel material, reduce the cost of the mold, to facilitate practical.
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