The punch includes an end portion adapted to Pierce an entry hole and bend material around the entry hole to form a retained slug along an inner edge of the entry hole.
该冲头包括端部，该端部适于刺穿入口孔并折弯环绕该入口孔的材料，以沿着该入口孔的内缘形成残留的废料。
The quality of the internal surface can be greatly improved and the punch force can be significantly reduced by using inner set hose.
内置软管可以有效改善管材的内表面质量，并显著减小冲头推力。
But, Young says, when one worker is greeted with a polite how-do-you-do while the guy next door gets a playful pretend-punch, it's clear in an instant who is in the inner circle and who isn't.
但是史蒂芬杨说，当一位工作者是以礼貌的问候被接见，隔壁的工作者则是不被当作一回事看来，立即就能明显得知谁较受重用。
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