The roundpunch is passed through a work plate placed on the PET to cause a punched-out piece to remain within the PET, thereby boring the fine hole.
圆形冲孔 器穿过放置在PET上的工作板,以便使冲掉的片留在PET内,由此钻出细 微孔。
2
A die apparatus is composed of a lower receiving die, a roundpunch having the shape of a fine hole, and PET provided between the lower receiving die and the roundpunch.