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精密冲裁,1935年起源于瑞士,1958～1960年得到普遍应用。精冲能用于厚板。譬如,能冲厚为10～14毫米的板材并且断面光滑,不会出现普通剪切那种断面。精冲能达到的表面光洁度为Ra0.2～1微米。还能省掉大大增加生产成本的普通冲裁所需要的某些工序,如刮、磨、去毛刺等。普通冲裁的剪切面真正剪切的部分只有材料厚度的1/3;对于精冲,材料的切割线内外分别被顶件器(推板)与凸模、齿圈压板与凹模牢固地压紧,冲裁时凸模完全贯穿到材料的全部厚度(见图)。
Precision blanking, 1935 originated in Switzerland, 1958 ~ 1960 has been widely used. Fine blanking can be used for thick plates. For example, the thickness of the board can be 10 ~ 14 mm thick and smooth section, the general cut that does not appear the kind of section. Fine polishing can achieve the surface roughness of Ra0.2 ~ 1 micron. But also save the need to increase the production costs of ordinary blanking some of the processes needed, such as scraping, grinding, deburring and so on. Ordinary blanking shear section of the actual shear only part of the thickness of the material 1/3; for fine blanking, the material inside and outside the cutting line were the top piece (push plate) and punch, ring gear and die firmly Compression, blanking the punch completely penetrate to the full thickness of the material (see Figure).