Based on CCOS and Preston assumption, a grind-polishing technique for rotational symmetry aspheric surface polishing process is proposed. In order to achieve equal-remove rate, a variable speed motion model is establishedbased on keeping the contact pressure between grinding tool and workpiece as a constant. By this theoretical principle, the functions of rotate speed and feed speed for every processing position have been inferred. To solve these functions, the rotation speed of workpiece and feed speed of grind-polish wheel in different working position should be gotten. CNC equipment would execute processing accurately. The results of experiment prove that the motion control model could ensure precision of grinding process, so that, the difficulty of polishing process has been reduced and whole processing efficiency has been improved.%针对回转对称非球面的抛光工序，本文提出了一种点接触式的磨抛工艺以及实现等去除量磨抛加工的数控设备运动模型。磨抛工艺基于数控光学表面成形技术及Preston假设，采用筒形磨抛轮对回转对称非球面进行点接触式磨抛加工。在加工过程中，数控设备各轴的运动为变速运动，即工件的转速及磨抛轮的进给速度随着加工位置的改变而改变。通过对该变速运动模型进行求解，并由数控加工设备进行精确控制，从而实现等去除量的磨抛加工。实验结果表明，该变速运动模型能够很好地实现回转对称非球面的等去除量磨抛加工。
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