On-machine measurement of machining error based on reconstruction of NURBS control points" />
On-machine measurement of machining error based on reconstruction of NURBS control points" />
On-machine measurement of machining error based on reconstruction of NURBS control points" />
基于NURBS控制点重构的加工误差在机测量方法
A new method to get the machining error of free-form surface was proposed based on the results of on-machine measurement in order to evaluate the profile error of machined surface. A small amount of points on machined surface were measured by on-machine measurement, and the machined surface was obtained by reconstructing the control points of the NURBS surface based on the on-machine measurement data. Considering the adaptability of solving optimization problems, the steepest descend method was used to calculate the distance between the machined surface and the theoretic surface, which could get the machining error of the whole free-form surface. Then the profile error of machined surface was evaluated. The proposed method was conducted in the measuring and analysis of NURBS surface workpiece. Results show that the method based on on-machine measurement data and reconstruction of NURBS control points is effective and rapid for the measuring and analysis of machining error of free-form surface.
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