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流钻(flow drill),是在高速旋转并施加一定的压力条件下,与所加工的金属板材摩擦生热,通过金属材料的热塑性变形,钻挤出孔的一种新型无切削工具(参见图1)。该工具是用硬质合金钢制成的,硬度在 Hv1200～1600之间。具有一定耐磨性和一定耐冲击性。流钻尖端角度的大小对摩擦生热的速度和所产生的热量多少及其工具本身的寿命等影响很大.根据试验,一般在90°～120°范围之内适当选取。钻挤螺纹底孔时,流钻的设计参数可参照表1选取。
A flow drill, a new type of non-cutting tool that drills holes by the thermoplastic deformation of a metal material, is a frictional heat generated by frictional heating with the metal sheet under a high speed of rotation and application of a certain pressure 1). The tool is made of carbide steel, hardness Hv1200 ~ 1600 between. Has a certain degree of wear resistance and impact resistance. The size of the flow tip angle greatly affects the rate of friction heat generation, the amount of heat generated, the life of the tool itself, etc. According to the test, it is generally selected within the range of 90 ° -120 °. Drilling crowded bottom hole, flow drilling design parameters can refer to Table 1 selected.