复杂曲面边界槽五座标数控加工的刀位计算

以两种较简单的加工──交线及底曲面的刀位计算结果产生槽加工的刀位数据。提出了刀具位置边界槽及基于边界槽的刀位计算方法。该算法中刀心位置由底面加工的刀心轨迹相对边界槽裁剪而得；刀轴矢量由边界槽空间网格划分产生。提出并证明了用于获得无干涉的和均匀变化的刀轴矢量的空间网格划分的准则。本文算法可对带岛屿及复杂曲面边界的槽进行五座标数控加工的刀位计算。

CUTTER LOCATIONS GENERATION OF 5-AXES NC MILLING FOR POCKETS BOUNDED BY SCULPTURED SURFACES

In this paper,cutter path of NC machining of pockets has been generated through re-sults oftwo easier cases of machining,i.e., machining of surface and machining of intersection of surfaces.A concept of Boundary Pocket of Cutter Locations(BPCL) has been presented to de-velop a simple and effective pocket machining algorthm,in which cutter cen ter locations are gained by clipping cutter path of machining of bottom surfaces with BPCL,and cutter axis vectors by a process of spatial mesh generation on the cap of BPCL. Conditions of spatial mesh generation to approach uncollided and evenly varied cutter axes have been presented and proved.This paper has also presented methods of verification and modification of cutter locations.The algorithm is capable ofhandling pockets bounded by sculptured surfaces wherever at the bottom or on the side ofthe pockets,with any number ofislands in 5-axes NC machining, and has been realized on the basis of NPU-CAD / CAM system(which is developed in authors′research center),and was successfully used in NC machining ofa vessel impeller,