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采用端面中凹的端铣刀取代传统的球头铣刀，在每一行程中让刀具运动形成的包络面与被加工表面之间在垂直于进给方向的法截面中达到三阶密切。在约束边界处，调整铣刀的姿态以便把曲面完整地加工出来。
Recessed end face milling cutter instead of the traditional ball-end milling cutter, in each stroke so that the tool is formed by the envelope and the surface to be machined in the normal to the feed direction of the law to achieve a third-order cross-section close. At the bounding border, adjust the attitude of the milling cutter so that the surface can be completely machined.