关键词: 微铣削, 表面粗糙度, 铝合金, 方差分析

Abstract:

The micro groove structures were processed on aluminum alloy surface using high speed micro-milling machine. Setting the values of Ra and Rz as the measurement standard, the surface quality of the groove was studied. The influences of parameters including spindle speed, the overhanging length of cutting tool, feed rate and axial depth of cut were analyzed based on orthogonal experimental method. The results show that the whole varying trend of the surface roughness is that the surface roughness of midline area>that of down milling area>that of up milling area. Spindle speed is the most important influence factor on surface roughness. By contrast, the level of other factors will be changed when the measurement standard of surface quality is different.Compared with other factors which affect the surface roughness differently according to different requirements of surface quality, spindle speed has the most significant influence. In response to the surface qualities' requirements, the results of optimal combination are that Ra is as 0.075μm and Rz is as  0.579 μm when the overhanging length of cutting tool is as 18mm, the axial depth of cut is as 10μm, feed rate is as  30mm/min and the spindle speed is as 48000r/min.

Key words: micro-milling, surface roughness, aluminum alloy, variance analysis