微小几何特征微铣削试验研究

Micromilling Experiment Study for Microminiature Geometry Feature

微小型零件几何特征的加工质量直接影响微小型零件的使用性能,本文对50μm厚的微小几何特征尺寸精度及表面质量开展试验研究。正交试验结果显示:微铣削黄铜材料时,铣削参数对铣削力的影响主次为每齿进给量f_z、轴向切深a_p、径向切深a_e;铣削参数对尺寸误差的影响主次为a_p> a_e> f_z;铣削参数对表面粗糙度的影响主次为a_p> f_z> a_e。试验获得优化参数组合为a_p=15μm、a_e=30μm、f_z=0. 7μm,表明微铣削过程中轴向切深对加工质量的影响大于其他参数。因此,实际生产中应选择合适的轴向切深,较大的进给量和径向切深,以保证微型几何特征的加工质量,获得较高的加工效率。

The machining quality of geometrical feature on microminiature components has direct effects on the usability of the microminiature components.Aiming at the dimensional precision and surface quality of micro geometrical features with 50μm in thickness,the experimental studies on key parameters in micromilling process is conducted.The results of orthogonal experiments show that the significance order of key parameters for milling force from large to small are feed engagement f z,axial depth of cut a p,and radial depth of cut a e when micromilling material brass,that for dimensional error is a p,a e and f z,and that for surface roughness is a p,f z and a e.The optimal parameter combination acquired in the optimization experiment are a p=15μm,a e=30μm and f z=0.7μm,which can guarantee the machining quality.The results show that the influence of axial depth of cut on machining quality is greater than that of other parameters in micromilling process.Therefore,in actual manufacture,suitable axial depth of cut,larger feed engagement and radial depth of cut should be chosen to ensure the machining quality of microminiature geometrical features and acquire higher working efficiency.