Methodology for Compensating Errors Detected by Process-Intermittent Inspection

摘要

This report describes principles and methodology for compensating geometricerrors of machined parts due to machining processes. The error tendencies are identified by on-machine inspection of the part before the finish cut. Tool path adjustments compensate errors anticipated in the finish cut. The methodology was validated on a prototype system implemented using the Process-Intermittent Error Compensation Software (PIECS) on a turning center. Process-intermittent gauging of a semifinished part is directed by the machine tool controller, thus detecting only errors due to tool setting, tool wear, tool deflection or part deflection. These process errors are distinguished from errors caused by machine tool geometry, which are identifiable only by inspection independent of the machine tool. For process errors, an error vector is defined as having its head at the measured coordinates of a gauged point, and its tail at the nominal coordinate for that point.