Study on Compensation of Machine Geometry Error for Three-axis CNC Milling with Ball-end Mill
There are various errors in the process system,which will cause machining errors in the parts,among which the machine geometry error is the more influential factor.Based on three-axis NC milling with ball-end mill,the geometric error of machine tool is measured and identified by laser interferometer and"nine line method"identification method.Based on the multi-body system theory and the screw theory,the three-axis milling spatial error model of the ball-end mill is estab-lished,and the geometric error of the machine tool is mapped to the position error of the ball-end mill center.According to the forming principle of workpiece surface in three-axis milling with ball-end mill,the programming cutter center surface is estab-lished by establishing the forward and reverse calculation model between the cutter center surface and the design surface/workpiece surface.The programmed tool center surface is imported into the CAM software and CNC programmed for the sur-face,which is machined using the generated machining program to compensate for machine geometry errors.
machine tools geometry errorerror compensationball-end millscrew theorytool center curved surface
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