微钻头螺旋槽对称性对钻头折断的影响

The effect of micro-drill bit’s helicoid symmetry to the micro-drill bit’s rupture

在微孔钻削过程中,影响钻头寿命的因素很多:如微钻头自身的直径,微钻头钻芯厚度,微钻头材料及制造工艺,以及微钻头螺旋面等。集中研究微钻头螺旋槽对称性对钻头折断的影响,并在前人提出的钻头制造方法及钻削过程中钻头受力情况研究的基础上,分析了微孔钻削过程中,由于微钻头螺旋槽的制造误差,造成两主切削刃上的钻削力不平衡,导致微孔钻削过程中微钻头的折断。同时,提出了改善微孔钻削过程中微钻头折段的措施以及最适合制造微钻头的方法。

In the course of micro drilling, there are many facts effecting drill bit＇s life. Such as micro-drill bit＇s diameter, corebit＇s diameter, the material and manufacture process of micro-drill bit, the helicoid of micro-drill bit. In this paper, it gives a description how the helicoid＇s symmetry effects the micro-drill bit＇s rupture in the micro-drilling. On the base of predecessor＇s research, the paper states the micro-drill bit＇s rupture in the course of micro drilling, because of micro-drill bit＇s helicoid symmetry. Simultaneously, propose the method to avoid the drill bit＇s rupture and the best means of producing micro-drill bit.