基于过渡面的同速区间规划与质量预估研究

针对过渡曲面加工表面质量往往比普通曲面更难控制的特殊性，开展与过渡面适应的速度规划、加工轨迹的局部优化等研究来改善过渡面的表面质量，并通过运动参数可视化来预测过渡面的加工质量。在一定变化范围内，使空间曲率、挠率具有连续性的连续程序段属于一个区间，以建立过渡面的刀具轨迹“同速区间”。在同速区间内建立弧长参数化、拟合递推式Akima样条曲线，实现刀具轨迹的局部优化。通过数控模拟软件采集运动参数(速度、加速度及电流等)，生成的插补文件导入自主开发的运动参数可视化软件，形成可视化图以此来预估加工表面质量。分别对可乐瓶底与变曲率曲面的过渡面进行同速区间规划与轨迹优化，得到了优化前后的可视化图。进一步，验证预估表面质量的有效性，通过对变曲率过渡面和五指山零件实际加工，验证了加工表面质量提高与否与可视化图好坏的一致性。因此建立过渡面同速区间及运动参数可视化，以实现过渡面的质量预估及提升效果。

Research on Speed Planning in the Constant Speed Interval and Quality Prediction on the Transition Surface

Aiming at the particularity that the transition surface is often more difficult to control than the ordinary surface connected to it, researches are carried out on adaptive speed planning, local optimization of machining toolpaths to improve the surface quality of transition surface, and the surface quality of the transition surface is predicted by visualization of motion parameters. Within a certain range of change, the continuous program segments that make the space curvature and torsion have continuity belong to a constant speed interval. Arc-length parameterization is established and recursive Akima spline curve is fitted in the constant speed interval to realize the local optimization of the toolpaths. The motion parameters (speed, acceleration and current, etc.) are collected through the NC simulation software to generate interpolation files and imported into the self-developed motion parameter visualization software, and a visualization map is formed to estimate the quality of the machining surface. The constant speed interval planning and trajectory optimization are carried out on the transition surface between the bottom of the cola bottle and the surface with variable curvature, respectively, and the visualization maps before and after optimization are obtained. Further, the effectiveness of the estimated surface quality is verified through the actual machining of the variable curvature transition surface and wuzhi mountain parts.The consistency of the improvement of the processed surface quality and the quality of the visualization is verified. Therefore, the constant speed interval and the visualization of motion parameters are established to realize the quality prediction and improvement effect of the transition surface.