我厂过去曾利用电钻夹持丝攻来攻制螺纹,但经常发生歪斜问题。后经工人和技术人员合作,研究出如附图的特殊丝攻,解决了丝孔歪斜的问题。特殊丝攻是在普通丝攻的前端加制出没有螺纹的导向部。导向部的直径和螺纹的内径(底径)相同。攻丝时,先把导向部伸入孔内,利用导向部的引导作用,使攻出来的螺纹不会歪斜。然后,再用 In the past, the factory used screwdrivers to hold the thread to attack threads, but the problem of skew often happened. After the cooperation of workers and technicians to study out the special wire tapping as the figure, to solve the problem of wire hole skew. Special wire tapping is the front end of ordinary wire tapping with no thread guide. The diameter of the guide portion is the same as the inner diameter (bottom diameter) of the thread. Tapping, the first guide into the Ministry of the hole, the use of guide the role of guidance, so that the attack out of the thread will not be skewed. Then, reuse