Control rules of surface integrity and formation of metamorphic layer in high-speed milling of 7055 aluminum alloy
Control rules of surface integrity and formation of metamorphic layer in high-speed milling of 7055 aluminum alloy
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DOI：
10.1177/0954405414527268
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
C. Yao;W. Zuo;Dao-xia Wu;J. Ren;Dinghua Zhang
中科院分区：
文献类型：
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作者：
C. Yao;W. Zuo;Dao-xia Wu;J. Ren;Dinghua Zhang
采用正交试验研究了铣削工艺参数对7055铝合金表面完整性的影响。为了将变质层与铣削过程中产生的热力学现象联系起来，采用有限元方法得到了加工表面的铣削力和温度场，重点研究了变质层的形成过程，并对铣削速度和每齿进给量进行了研究。实验结果表明，当铣削速度、每齿进给量、铣削深度和铣削宽度分别为1100 m/min、0.02 mm/z、0.7 mm和6 mm时，得到的表面粗糙度、X方向表面残余应力、Y方向表面残余应力和表面显微硬度分别为Ra 0.258µm、- 123 MPa、- 137 MPa和193.76 HV0.025。从精密加工到粗加工，压残余应力层深度从35µm增加到45µm，塑性变形层深度从5µm增加到20µm。最后，变质层的形成可以用热-力耦合效应来解释。
Orthogonal experiments were conducted to investigate the effects of parameters on surface integrity in milling 7055 aluminum alloy. In order to correlate metamorphic layer with thermal and mechanical phenomena developed during milling, milling force and temperature fields of machined surface were obtained with finite element method, while milling speed and feed per tooth were paid particular attention to study formation of metamorphic layer. Experiment results show that when milling speed, feed per tooth, milling depth, and milling width are 1100 m/min, 0.02 mm/z, 0.7 mm, and 6 mm, respectively, obtained surface roughness, surface residual stress in X direction, surface residual stress in Y direction, and surface micro-hardness are Ra 0.258 µm, −123 MPa, −137 MPa, and 193.76 HV0.025, respectively. From precision machining to rough machining, depth of compressive residual stress layer increases from 35 to 45 µm, and the depth of plastic deformation layer increases from 5 to 20 µm. Finally, the formation of metamorphic layer can be explained by thermo-mechanical coupling effects.