提高叶片四轴联动加工效率的研究

Research on Efficiency Improvement of Blade Through Four-axis Machining

某型高温合金航空发动机叶片采用四轴联动加工中心完成,大多数四轴联动加工中心的共同特点是A轴旋转速度低。通常情况下,采用UG软件编程并在四轴联动加工中心进行精加工,在叶缘部分的切削进给速度只有叶身部分进给速度的1/3甚至更低,加工效率较低。通过UG后处理程序进行二次开发,设定两点间圆弧对应圆心角与两点间距离的比值为变量,判断刀具铣削的位置,当刀具切削叶前后缘时,自动调整切削速度,在保证叶片表面质量的前提下有效提高叶片的加工速度,该工艺在实际加工生产中取得了良好的效果。

A superalloy aero-engine blade is machined by four-axis machining center.Most of the 4-axis machining centers have common feature that the rotation speed of the A-axis is low.Usually,the cutting speed of the blade edge part is only 1/3 or even lower than that of the blade body part by using UG software programming and four-axis machining center for finish machining,resulting in low machining efficiency.Based on the research,after secondary development of UG post-processing program,the ratio of the central angle of the corresponding arc between two points to the distance of the two points is set as a variable to judge the milling position of the tool,and when the tool cuts the blade edge,the cutting speed is automatically adjusted to effectively improve the processing speed of the blade on the premise of ensuring the surface quality of the blade.In the actual process,this technology achieves good results.