| 摘要 |
<p>A novel two part punch stripper (10) for use with punches (12) carried by a punch press (16). The novel two part urethane punch stripper of this invention includes generally cylindrical concentric tubular upper and lower parts (50 and 52). The lower part (52) is formed of a urethane of a conventional hardness for a punch stripper, the hardness being in the range of 80A to 100A (Shore). The tubular upper part (50) is formed of a urethane substantially harder than the lower part of the stripper, for example, in the range of 75D (Shore). The combined length of the upper and lower parts is greater than the length of the portion of the punch which extends below the punch retainer assembly (14) so that a proper preload can be achieved. The upper part and lower parts are bonded to each other by a suitable adhesive. Alternatively, they may be bonded to each other by sequentially casting in a common mold.</p> |
