TC4钛合金微细铣削仿真与试验研究

Simulation and experimental research of micro-milling of TC4 titanium alloy

钛合金由于其高的强度和耐热性、低的导热系数,在微细加工时若切削参数选择不合理容易导致切削力大、加工质量不稳定。在微细铣削加工中,由于刃口半径和尺寸效应的存在,选择合适的切削参数对于切削状态的改善有重要意义。通过仿真和试验对比分析,研究TC4钛合金在微细铣削过程中每齿进给量对切屑变形、铣削力和加工表面粗糙度的影响,以期为改善微细切削状态、提高加工表面质量提供合适的切削参数选择指导。结果表明,在使用刃口半径为2.05μm、刀具直径为1 mm的硬质合金铣刀对TC4钛合金进行微细铣削加工时,微细铣削TC4钛合金切削状态发生转变时所对应的临界每齿进给量为0.8μm/z;微细铣削时每齿进给量应大于此临界值。

Due to the high strength and heat resistance,small thermal conductivity of titanium alloy,the large cutting force and unstable machined quality may be caused by the inappropriate selection of cutting parameters in micro machining process.In micro-milling process,due to the existence of edge radius and size effect,it has great significance to select appropriate cutting parameters to improve the cutting state.The effect of feed per tooth on the chip deformation,milling force and machined surface roughness was investigated in micro-milling of TC4 titanium alloy,through the comparative analysis of simulation and experimental.It was expected to provide appropriate cutting parameter selection guidance for improving the micro cutting state and improving the machined surface quality.The results show that,when using a cemented carbide milling cutter with a cutting edge radius of 2.05 μm and a tool diameter of 1 mm for micro-milling,the critical feed per tooth is 0.8 μm/z,corresponding to the transition of the cutting state in micro-milling of TC4 titanium alloy.The feed per tooth should be greater than this critical value.