这种螺旋形精铰刀是我们学习昆明机床厂新型铰刀的经验,结合我厂加工连杆螺钉孔的要求,经过多次实践改进而成的。其特点如下:(1)切削刃采用15°螺旋角,在切削部分则磨出25°螺旋角(如附图),使切入平稳,并使切屑由铰孔的前方顺利排出,不致因切屑挤塞而擦伤孔壁表面,使孔 This spiral reamer is our experience in learning a new type of reamers Kunming Machine Tool Factory, combined with our factory processing rod screw hole requirements, after many improvements made. Its features are as follows: (1) the cutting edge with 15 ° helix angle, the cutting part of the wear out of 25 ° helix angle (Figure), the cut into a smooth, and the chip reaming smoothly from the front of the discharge, Plugs and scratches the hole wall surface to make the hole