使用装有径向弹性导向块的专用铰刀可使孔的加工质量和刀具寿命得到提高。根据加工要求,导向铰刀可以经受住进入孔时的冲击,保证工艺系统有固定的张力,减小孔的扩张量和使被加工表面光洁平整。导向块1(图1)以最小间隙安装在铰刀体3槽内的弹性件2上,并用法兰盘4紧固。为使弹性件工作可靠,其宽度b应比刀体槽宽度小0.4～0.6mm。为了保证作用在导向块上的 The use of a special reamer with a radial elastic guide increases the machining quality and tool life of the hole. According to the processing requirements, the guide reamer can withstand the impact into the hole to ensure that the process system has a fixed tension, reducing the amount of expansion holes and to be machined surface smooth formation. The guide block 1 (FIG. 1) is mounted on the elastic member 2 in the groove of the reamer body 3 with a minimum clearance and secured with the flange 4. In order to make the elastic parts work reliably, the width b should be 0.4 ~ 0.6mm smaller than the width of the cutter body. In order to ensure the role of the guide block