冷却条件对Ti-6Al-4V铣削表面完整性影响研究
Effects of Cooling Conditions on Surface Integrity during Side-milling of TC4 Alloy

通过实验对比研究TC4钛合金铣削加工过程中不同冷却条件对其加工表面完整性的影响规律。研究结果表明:在相同的铣削参数下,乳化液冷却条件下加工表面的粗糙度值和显微硬度值均比在干切削条件下小;在乳化液冷却和干切削两种条件下的加工表面残余应力均为压应力;随着铣削速度、每齿进给量和铣削宽度的增加,在乳化液冷却条件下的残余应力绝对值逐渐增大,而在干切削条件下,残余应力绝对值逐渐减小;在乳化液冷却和干切削两种条件下,铣削参数中铣削深度对表面完整性的影响最小。
Machined surface integrity of titanium alloy plays a key role due to its strong correlation with the functional performance and service life. In this paper, several side-milling tests were developed to investigate influence law of different cooling conditions on surface integrity in milling of TC4 alloy. The results showed that the values of surface roughness and microhardness under emulsion condition were lower than that in dry condition with same cutting parameters, machined surface residual stresses were compressive stresses in emulsion and dry conditions. Under emulsion condition, the absolute value of residual compressive stress always increased with the increasing of cutting speed, feed per tooth and milling width, while the reverse redistribution phenomena were found under emulsion condition. Under emulsion and dry conditions, milling depth had less influence on surface integrity than the other milling parameters