NOVEL DECONVOLUTION BASED FEEDRATE SCHEDULING TOWARDS A NEW CLASS OF CAM FOR TIME-DEPENDENT PROCESSES

抄録

Conventional mechanical machining processes such as milling, turning, and grinding are position-dependent processes where the volume of material removed is solely dependent on the engagement geometry of the tool and workpiece. However, advanced precision polishing processes with a compliant tool, fluid jet, or laser are characterized as time-dependent processes (TDP) where the volume of material removed depends not only on the tool position but also on its influence duration on the workpiece. Accordingly, accurate planning of the feedrate profile in sync with the tool position becomes necessary to accurately control the material removal rate and final target shape profile. A novel feedrate planning algorithm is proposed in this paper, which schedules the position-dependent feedrate based on the time-dependent process dynamics and the target shape profile. The feedrate profile is designed as a B-spline, and control points are optimized in the sense of least squares based on the process dynamics and target final shape. The developed algorithms were demonstrated in fluid jet polishing of precision optics.