高速干式铣削对7075-T651铝合金表面质量的影响

Effect of high speed dry milling on surface quality of 7075-T651 aluminum alloy

为了研究高速干式铣削条件下的切削参数对7075铝合金表面质量的影响规律,采用单因素法对7075-T651铝合金进行高速干式铣削实验,分析进给量和切削深度对铣削力、表面粗糙度、残余应力、切屑形貌、表面形貌的影响规律。通过测力仪、残余应力仪、粗糙度测量仪和超景深显微镜对铣削力和表面残余应力、粗糙度、切屑、加工面纹理进行测试分析。结果表明:增大进给量和切削深度,铣削力也随之增大;随进给量和切削深度的增加,表面粗糙度也呈增大趋势;在实验选用参数范围内残余应力均表现为压应力,且随着进给量和切削深度的增大而增大;切削参数对切屑整体形貌影响不大,均为带状切屑,但是随着切削深度的增大带状切屑尺寸变小;随着进给量的增大表面形貌中每条均匀突起的棱脊位移也逐渐加大并且等于铣削参数中的每齿进给量。

In order to study the influence of cutting parameters on the surface quality of 7075 aluminum alloy in high speed dry milling,the single factor method is used to conduct high speed dry milling experiments on 7075-T651 alloy.The effects of feed rate and cutting depth on milling force,surface roughness,residual stress,chip morphology and surface morphology are analyzed.The cutting force,surface residual stress,surface roughness,chip morphology and surface morphology are measured and analyzed by dynamometer,stress analyzer and ultra-depth-of-field microscope.The results show that the cutting force increases as the feed rate and cutting depth increases.The surface roughness value shows an increasing trend as the increase of feed rate and milling depth.Within the range of the experimental parameters,the surface residual stresses are the tensile stress.As the feed rate and cutting depth increases,the surface residual stresses tend to increase.Cutting parameters have little effect on the overall chip morphology,which are band-shaped chips,but the size of band-shaped chips becomes smaller as the depth of cut increases.With the increase of the feed rate,the displacement of each uniform ridge in the surface morphology increases gradually,and is equal to the feed per tooth in the milling parameter.