关键词: 圆锥刀, 侧铣, 叶轮叶片, 刀轴轨迹规划, 共轭曲面, 数字仿真

Abstract: Aiming at the complicate knife axis trajectory planning in integral impeller blade curved surface of conical tool flank milling,a feasible knife axis trajectory generation method was proposed.This method was divided into two steps,the initial knife shaft surface was proposed according to the two-points offset method in the first step:the knife shaft position was optimized by using geometry properties of conical surface in the second step.Through forcing the each instantaneous contact of tool surface and blade surface line,an overdetermined system of the tool surface multipoint tangent to blade surface with knife shaft position as variable was established,and the least square method was used to solve this equation system.According to the digital simulation principle of conjugate surface,the error calculation model between the cutter envelope surface and the blade surface was built by using the blade surface as the datum plane and the benchmarking ray as a link.The decision basis for machining interference was also given.The example showed that the envelope error of the knife shaft was significantly reduced after optimization,and the effectiveness of the proposed method was also proved.

Key words: conical tool, flank milling, impeller blade, knife shaft trajectory planning, conjugate surface, digital simulation