TiAl合金薄壁件铣削加工切削力与表面粗糙度研究

Research on Cutting Force and Surface Roughness of MillingThin Wall TiAl Alloy Parts

钛铝合金是一种新型的轻质高温结构材料,拥有良好的物理和力学性能,适用于航空发动机叶片等领域。通过用球头铣刀铣削加工钛铝合金薄壁件的正交试验,分析了切削参数对铣削钛铝合金薄壁件切削力和表面粗糙度的影响,建立了基于切削参数的切削力及表面粗糙度的指数预测模型。研究表明,对切削力的影响因素重要性由大到小依次为轴向切深和每齿进给量,主轴转速和行距对切削力的影响不显著;对Ra和Sa的影响因素重要性由大到小依次为行距、每齿进给量,而主轴转速和轴向切深对Ra及Sa的影响不显著;通过F检验以及试验验证表明,所建立的指数预测模型可以用于铣削加工钛铝合金薄壁件的切削力和表面粗糙度的预测。

Titanium aluminum alloy is a new type of lightweight high temperature structural material,which has good physical and mechanical properties,and is suitable for aeroengine blades and other fields.Through the orthogonal experiment of milling thin-walled titanium aluminum alloy parts with ball end milling tool,the influence of cutting parameters on cutting force and surface roughness is analyzed,and the exponential prediction model of cutting force and surface roughness based on cutting parameters is established.The results show that the important factors affecting the cutting force from large to small are axial cutting depth and feed rate per tooth,the spindle speed and row spacing have no significant effect on the cutting force;For Ra and Sa,the important factors from large to small are row spacing and feed rate per tooth,while the spindle speed and axial cutting depth have no significant effect on Ra and Sa.Through F-test and experiment,the results show that the exponential prediction model can be used to predict the cutting force and surface roughness during milling thin-wall TiAl alloy parts.