基于关键刀轴矢量插值的球头铣刀五轴加工光顺刀轴矢量生成方法

Smooth Tool Orientation Generation Method of Five-axis Ball-end Milling via RTOs Interpolation

提出基于贪心策略的复杂曲面加工刀具路径关键刀轴矢量序列整体优化方法,以及基于关键刀轴矢量插值的球头铣刀五轴加工复杂曲面光顺刀具姿态生成方法。计算各关键刀位刀触点处的刀轴矢量可行域,基于贪心策略从刀轴矢量可行域中选择关键刀轴矢量序列并且插值关键刀轴矢量序列,检查加工路径刀轴矢量序列是否存在碰撞干涉,进而获得可行的关键刀轴矢量序列集合。根据光顺评价指标从可行的关键刀轴矢量序列集合中选择最优的关键刀轴矢量序列,然后获得整个加工路径光顺的刀轴矢量序列。试验结果表明,该方法生成的复杂曲面加工刀具姿态能够使机床旋转轴运动平稳。

A method of determining the RTOs was proposed herein based on a greedy strategy,and a method of generating smooth tool orientations was proposed for five-axis ball-end milling via RTOs interpolation.The feasible domains of the tool orientation at the cutter contact points of each RTO were calculated.Then the RTOs along the tool path were selected from the tool orientation feasible domains based on the greedy strategy,and the RTOs were interpolated to check whether the tool orientations along the whole tool path occured collision.Afterward,the feasible RTOs set was obtained.The optimal RTOs were selected from the feasible RTOs set according to the tool path smooth evaluation indicators,and then the whole tool path was acquired.The test results show that the tool path of the complex surface generated by the proposed approach may make the machine tool rotary axes move smoothly.