开式整体叶盘鼓形刀叶片精加工刀路规划研究

Research on Tool Path Planning of Blade Finish Machining for of Integral Blisk Barrel Cutter

整体叶盘叶片精加工是决定整体叶盘质量的重要因素。针对开式整体叶盘叶片精加工切削刀路长和加工效率低的问题,首先分析了鼓形刀刀位轨迹规划的基本原理,然后给出了相邻切削行之间残留高度的计算方法,提出了鼓形刀叶片精加工基于切触点规划及刀轴优化的方法。该方法首先通过求交法确定切削面上的切触点,然后调整刀具姿态并进行干涉检查,确定每个刀位的无干涉刀轴姿态,即在可行域内优化得到最佳刀轴。将该方法集成到整体叶盘五轴数控加工编程软件UltraCAM中,经过数控编程、仿真分析及试切加工表明,使用鼓形刀进行叶片精加工,在相同残留高度的情况下,刀路数明显减少,刀路光顺,仿真过程中无刀具干涉,刀轴变化平稳,提高了加工效率,可应用于实际加工。

The blade finish machining of integral blisk was an important factor to determine the quality of integral blisk.Aimed at the problem of long cutting path and low efficiency of integral blisk blade finish machining,firstly,the basic planning principle of the barrel cutter’s tool path track was analyzed,and then the calculation method of the residual height between adjacent cutting rows was given,A method for blades finish machining with barrel cutter was proposed based on cutting contact planning and tool orientation optimization.This method firstly determined the cutting contact point on the cutting surface through the intersection method,and then the tool posture was adjusted and finished collision checking to determine the non-interference tool posture of each tool position,which was the best tool axis optimized within the feasible region.The method was integrated into UltraCAM that was a five-axis CNC machining system for integral blisk.The simulation analysis and trial machining results showed that when the barrel cutter was used for blade finishing,under the same residual height,the number of tool paths was significantly reduced,which improved the processing efficiency.The tool path was smooth,there was no tool interference in the simulation process,and the tool axis changed smoothly.It improved machining efficiency and could be applied into actual machining.