复合型陡峭曲面高速加工刀路的优化

Optimization of Tool Path in Composite Inside Steep Surface Based on High Speed Machining

针对现有数控加工中螺旋刀轨对曲面形状适应性差、无法应用于复杂陡峭曲面的问题,提出了一种复合型内侧陡峭面螺旋刀轨。一方面,通过构建圆柱螺旋线的方法获得光顺的螺旋驱动曲线;另一方面,通过抽取实体并将顶部曲面替换为平面的方法构建检查几何体;然后将螺旋驱动曲线和检查几何体导入CAM软件,对进退刀轨迹进行光顺化处理,从而生成连续光顺的螺旋刀轨。刀轨模拟和实际加工结果表明,复合型内陡峭面螺旋刀轨有效解决了高速加工中的切削颤振,显著提高了内侧陡峭面的加工效率和加工精度。

The spiral tool path has poor adaptability to curved shape and cannot be applied to the inner side of complex steep surfaces in existing CNC machining. A composite inside steep spiral tool path is proposed. Firstly, a cylinder helix is constructed to get a smooth spiral - driving tool path. Secondly, a body is extracted and its top will be substituted by a plane to construct check geometry. Thirdly, the spiral driving curve and the check geometry are imported to CAM software, the engage and retract paths are smoothed to get continuous smooth spiral paths. Tool path simulations and practical machining results show that the problem on cutting flutter of high speed machining is solved by composite inside steep spiral tool path efficiently, and the machining efficiency and accuracy of inside steep surfaces are improved significantly.