CUTTER CORRECTION METHOD FOR IMPROVING THE ACCURACY OF MANUFACTURED SCREW ROTOR BY END MILLING CUTTER

Abstract

The accuracy of the RP (RP) is a significant factor in the vacuum pump performance. However, the manufactured RP deviates from this theoretical form due to cumulative machine-tool errors—such as temperature changes, humidity, and nearby vibrations. Therefore, a cutter-correction method is proposed to improve the accuracy of the manufactured profile by accounting for RP errors during cutter design. A mathematical model of the design end-milling cutter profile, accounting for compensated cutter parameters, is first proposed. The effect of the compensated cutter parameters on the RP error is investigated and summarized in a sensitivity matrix. The correction cutter profile is established using the correction cutter parameters, which are solved by applying the sensitivity matrix and Levenberg-Marquardt algorithm. The numerical example is provided to validate the proposed approach for reducing RP error