Abstract: 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.

Key words: quality prediction, Akima fitting, constant speed interval, visualization