我厂制造的某产品中,有很多铸铁件需要攻 M5、M6的小螺丝孔,以前我们都是由工人用丝锥手攻,这样工时费的多,质量又不好,容易出废品。最近我们学习苏联先进经验,改进了一种可调节的摩擦保险套扣夹头,使用效果很好,效率比以前提高了一倍多,质量也提高了,并且保证丝锥不会折断。保险套扣夹头的结构如附图。图中1是主轴,套在钻床的钻轴内,上面的斜度与钻床轴孔配合,下面的斜度与法兰 I plant a product, there are a lot of cast iron pieces need to attack M5, M6 small screw holes, before we are hand tapping by workers, so more working hours, the quality is not good, easy out of the waste. Recently, we have learned advanced Soviet experience and have developed an adjustable frictional collet chuck that works well with efficiencies that are more than double the efficiency and the quality is improved without breaking the tap. Condoms clip chuck structure as shown in the drawings. Figure 1 is the main shaft, set in the drill shaft drilling, the top of the slope with the drilling shaft hole with the following inclination and flange