滚压和辗轧螺纹都能提高螺纹副的耐磨性和它的静载和动载强度,以及由于精度的提高、粗糙度的降低和表面的强化,从而减少了接触面的咬住现象。对于精整强化加工螺距大于2mm、直径为20～60mm的精密螺纹就不能使用滚压头和无屑丝锥。为此研制了一种专用的复合丝锥(见 Rolling and rolling of the thread can improve the wear resistance of the thread pair and its static and dynamic load strength, as well as reduce biting on the contact surface due to increased accuracy, reduced roughness and surface hardening. For finishing reinforcement machining pitch greater than 2mm, diameter of 20 ~ 60mm precision thread can not use the rolling head and non-chip tap. To this end developed a special composite taps (see