鼓形铣刀侧铣加工叶盘叶片曲面的光顺刀具路径生成方法  

Smooth Flank Milling Tool Path Generation for Blisk Surface with Barrel Cutters

作　　者：卢耀安 陈守峰 王成勇[1] LU Yaoan;CHEN Shoufeng;WANG Chengyong(School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006)

机构地区：[1]广东工业大学机电工程学院,广州510006

出　　处：《机械工程学报》2022年第1期256-266,共11页Journal of Mechanical Engineering

基　　金：佛山市科技创新(1920001000818);国家自然科学基金(51805094)资助项目。

摘　　要：鼓形铣刀使用其大弧度切削刃进行切削加工,不仅可以采用大步距加工而仍保持相同表面加工质量,还可以通过改变刀具与工件曲面的切触点在刀具切削刃的位置使刀具和刀柄远离工件,避免碰撞,因此鼓形铣刀特别适合叶盘类零件的叶片曲面加工。现有的光顺刀轴矢量规划方法多使用最短路径算法在机床旋转轴位置的可行空间中求解光顺的刀轴矢量序列。然而,最短路径算法需要把连续问题转化为离散问题求解,在可行空间中的采样间隔越小,所得刀轴矢量序列的质量越高,但计算时间会很长。因此提出了缩短最短路径算法求解光顺刀轴矢量序列的计算时间的方法,并提出了鼓形铣刀侧铣加工叶盘叶片曲面的光顺刀具路径生成方法,该方法同时考虑机床旋转轴和刀具刀尖点运动轨迹的光顺性。试验结果表明,该方法生成的刀具路径能够使机床轴运动平稳。The profile of a barrel cutter is a cutting segment with a large radius. This arc segment enables larger step-overs while remaining satisfied surface roughness, and it allows the cutter to tilt away from the part surface by changing the position of the contact point on the cutting segment, avoiding the collisions of the barrel cutter with the part. Hence, barrel cutters are suitable for blisk surface milling. The shortest path algorithm is usually utilized in most existing smoothing methods of generating collision-free rotary axes movements. The optimization problem must be converted from a continuous problem into a discrete problem when using the shortest path algorithm, and reducing the sampling interval will improve the obtained solution. However, it will require extensive computations. To solve this shortcoming, two strategies to reduce the computation time of the shortest path algorithm are proposed,and a smooth flank milling tool path generation method for blisk surfaces with barrel cutters is developed accordingly. This method smooths the tool tip trajectory and the rotary axes movements simultaneously. Numerical examples and the machining test are carried out to confirm the validity of the proposed approach.

关 键 词：鼓形铣刀 光顺路径 叶片曲面 最短路径算法 

分 类 号：TG506[金属学及工艺—金属切削加工及机床]