汽车玻璃钢化风栅成形器五轴加工刀轴矢量插值

为了解决汽车玻璃钢化风栅成形器五轴加工时刀轴矢量频繁变换造成冲击或发生干涉等问题，提出一种刀轴矢量插值方法。根据被加工曲面的几何形状和误差要求确定刀触点，根据被加工曲面的微分几何性质确定刀轴矢量的后跟角和摆转角。在已确定刀触点处的刀轴矢量的基础上，采用空间矢量光滑插值方法获得一系列中间位置刀轴矢量使刀轴变化较均匀。以货车前挡风玻璃钢化风栅成形器的一个拼镶块工作表面和风栅孔五轴NC加工为例进行仿真。结果表明，该刀轴矢量光顺方法可以避免刀轴方向频繁变换，同时也可有效地提高加工精度。

Five-axis Tool Orientation Interpolation in Windshield Mold of Automobile Toughened Glass Machining

In order to avoid striking or collision caused by incessant changing of tool orientation in five-axis NC machining of windshield mold of automobile toughened glass, a tool orientation interpolation method was put forward. First, the cutter contact points were calculated according to the geometry and tolerance of the curved surface to be machined. Then the tiled angle and inclination angle were determined by the invariants of the differential geometry of the surface. The interpolation cutter axis vectors, which turned gradually and evenly, were obtained on the basis of the vectors on the representive areas, using smoothing interpolation algorithm of spatial vector. The five-axis NC machining of surface and windshield holes, as an example, was simulated according to the smoothing method. The results show that this method can avoid frequent orientation change of the cutter,and can improve the process precision efficiently.