The CMM is a good way to measure the shape error of the workpiece after initial machining. IIn order to study the error of measuring workpiece with CMM, this paper introduces the three-dimensional contour measurement theories and methods of measuring optical free-form surface, analyzes the three coordinates measuring instrument error of measuring free-form surface, and by using the basic principle of the least squares method, can set up the free surface correction error data processing model, then particle swarm optimization (pso) with inertial weights are used, solving the error parameters is realized. Matlab programming is used to simulate the free-form surface data. The computer simulation verifies the feasibility of the data processing model and processing software.
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