基于最小加工表面裂纹的TiAl合金铣削参数优化

TiAl合金以其优异的性能被广泛应用于航空、航天制造领域,但由于TiAl合金自身的物理、化学特性,导致其切削性能较差,加工过程中容易出现工件表面烧伤、表面微裂纹等问题。为了研究TiAl合金铣削加工过程中切削工艺参数对加工表面裂纹的影响规律,设计了TiAl合金切削参数与加工表面裂纹之间的正交试验。结果表明:切削速度对TiAl合金铣削表面裂纹的影响最大,其次是切削深度和切削宽度,每齿进给量对表面裂纹的影响最小。基于遗传算法,以表面裂纹长度为目标函数,优化得到的最优参数组合为:ae=0. 2 mm、ap=0. 2003 mm/z、fz=0. 02001 mm/z、vc=20. 0004 m/min。采用优化后的参数铣削TiAl合金,发现工件表面的实际加工裂纹长度和经过算法优化的裂纹长度相差较小,该优化方法可行性较高,误差较小。

Optimization of Milling Parameters of TiAl Alloy Based on the Minimum Machined Surface Cracks

TiAl alloys were widely used in aviation,aerospace and other manufacturing fields because of their excellent properties.However,due to the physical and chemical characteristics of TiAl alloys,their cutting performance was poor,and surface cracks,burns and so on issues were easy to occur in processing.In order to study the effect of cutting parameters on surface cracks in the milling of TiAl alloy,the orthogonal experiment of TiAl alloy cutting parameters and machined surface cracks was designed.The results show that the cutting speed has the greatest influence on the surface crack of TiAl alloy milling,followed by the cutting depth and cutting width, and the feed per tooth has the least effect on the surface crack.According to genetic algorithm,taking the surface crack length as the objective function,the optimal combination of parameters are:a_e=0.2 mm,a_p=0.2003 mm/z,f_z=0.02001 mm/z,v_c=20.0004 m/min.It is found that the error between the actual machining crack length and the optimized crack length is very small,which used the milling parameters optimized by GA.The optimal method is feasible and has low error.