连续多类型曲线段进给速度前瞻规划

发布时间：2019-07-02 20:20

【摘要】：为解决由直线、圆弧与参数曲线形成的多类型曲线段混合插补过程中的进给速度前瞻规划问题,提出一种连续多类型曲线段进给速度前瞻规划算法。该算法以预读的加工路径作为进给速度规划单元,通过曲线段划分生成连续多类型曲线段;根据插补几何误差与机床动力学参数建立段间衔接点进给速度约束;使用三次多项式型进给速度曲线,利用解析法精确计算各曲线段在曲线长度约束下的进给速度参数,以充分发挥机床的动力学性能;使用回溯重规划策略进行全局规划,实现段间速度连续性;通过进给速度规划残差补偿策略降低残余长度、提高终点精度。实例分析表明,该算法能显著提高终点精度、生成平滑的进给速度曲线、降低加工时间。通过加工实验验证了该算法有效、可行,并能充分发挥机床的动力学性能。
[Abstract]:In order to solve the problem of forward planning of feed speed in the process of mixed interpolation of multi-type curve segments formed by straight line, arc and parameter curve, a forward planning algorithm of feed speed of continuous multi-type curve segment is proposed. In this algorithm, the pre-read machining path is used as the feed speed planning unit, and the continuous multi-type curve segments are generated by dividing the curve segments; according to the interpolation geometric error and the dynamic parameters of the machine tool, the feed speed constraint of the joint point between the segments is established, and the feed speed parameters of each curve segment under the curve length constraint are accurately calculated by using the cubic multinomial feed speed curve, so as to give full play to the dynamic performance of the machine tool. The backtracking reprogramming strategy is used for global planning to realize the velocity continuity between segments, and the residual length is reduced and the end point accuracy is improved by using the feed speed planning residual compensation strategy. The example analysis shows that the algorithm can significantly improve the end point accuracy, generate a smooth feed speed curve, and reduce the processing time. The machining experiments show that the algorithm is effective and feasible, and can give full play to the dynamic performance of the machine tool.
【作者单位】：北京航空航天大学机械工程及自动化学院;北京市高效绿色数控加工工艺及装备工程技术研究中心;
【基金】：国家自然科学基金资助项目(11290144)~~
【分类号】：TG659

【参考文献】