我厂生产的产品中有一个主零件,φ1.2mm孔需要在钻模定位加工,在1972年至1977年生产中,由于钻套是用碳钢制作,在车床上加工;生产产品零件质量保证不了,生产几百个零件更换一个钻套,浪费大,周期长。本人在1978年中,把用料革新一下,将硬质合金材料在线切割机床上加工,能保证尺寸精度和同心度。以后,我厂钻模的钻套都采用硬质 I plant a product produced by the main parts, φ1.2 mm hole positioning in the drilling process, from 1972 to 1977 in the production, the drill sleeve is made of carbon steel, the lathe processing; production of parts quality assurance No, producing hundreds of parts to replace a drill sleeve, waste large, long cycle. I am in 1978, the material innovation, the carbide cutting machine tool on-line, to ensure dimensional accuracy and concentricity. Later, my factory drilling die sets are hard