底刃钝圆半径对微细铣削加工的影响研究

Study on Influence of Cutting Edge Radius on End Cutting Edge in Micro Milling

在微细铣削过程中,刀具大多数为径向进给,侧刃为主要切削刃,针对侧刃进行的研究较多,但是缺少对底刃的研究,因此本文对仅有底刃参与切削的情况进行了仿真与试验研究。通过对仿真中切屑形貌与试验中表面粗糙度的分析,分别确定了仿真与切削试验的最小未变形切屑厚度值。仿真与切削试验结果表明,最小未变形切屑厚度的仿真值与试验值没有明显差异,最小未变形切屑厚度为0.61~0.70倍的铣刀钝圆半径。根据仿真结果,发现切屑的形成受切削速度的影响。本研究可以用于指导微细铣削加工中对于不同刀具钝圆半径及工件材料加工参数的选择和量化,对于减少刀具磨损,提高微小工件加工质量,有较为重要的指导意义。

In the milling,most of the cutting tools are radial feed and the peripheral cutting edge is the main cutting edge.There are many researches on the peripheral cutting edge,but there is a lack of research on the end cutting edge.Therefore,the simulation and experimental research on the condition that only the end cutting edge engages in the cutting is conducted.By analyzing the chip morphology in simulation and the surface roughness in experiment,the minimum undeformed chip thickness in simulation and cutting experiments are determined respectively.Simulation and experimental results show that there is no significant difference between the simulation value and the experimental of the minimum undeformed chip thickness,and the minimum undeformed chip thickness is 0.61~0.70 times of the cutting edge radius.According to the simulation results,it is found that the chip formation is affected by the cutting speed.The present study can be used to guide the selection and quantification of different cutting edge radius and machining parameters of workpiece materials in micro milling,which has an important guiding for reducing the tool wear and improving the processing quality of workpiece.