On-machine measurement method of machining errors based on reconstruction of surface control points
To improve the machining accuracy of large-scale automobile outer cover molds,an on-machine measure-ment method of free-form surface machining errors was proposed.The triangular mesh was generated based on the improved wavefront method,the coordinate data of the theoretical surface mesh nodes were extracted,and the sam-pling data of the actual processed surface was obtained according to the on-machine measurement;then the surface was reconstructed based on the wavelet control point method of T-splines,and the processing curved surface was fit-ted;the normal distance from the reconstructed actual curved surface control point to the theoretical curved surface was calculated based on the generalized Newton method,the processing error distribution of the curved surface was obtained,and the profile error of the experimentally processed convex-concave surface sample was analyzed.The ex-perimental results showed that the surface reconstruction method based on the T-splines control point method could effectively obtain the machining error of the free-form surface on the machine.
on-machine measurementmachining errorsurface reconstructionT-splinewavelet control point method
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