The establishment of workpiece system is a key link in nc machining, and it has a great influence upon nc programming and machining quality.

工件坐标系的建立，是数控加工中一个非常重要的环节，它对数控编程、加工质量都会产生重大影响。

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To aim at the research on cutting direction in NC machining of free-form surfaces, a simplified time model for tool trace is established, and the system of tool path programming is discussed.

针对自由曲面走刀方向数控加工的研究，建立了简化的刀具轨迹时间模型，并对路径规划的系统进行了讨论。

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Through the research of a processing example, the article gives a new processing method and a NC programming method in changeable disc cutter body processing with machining center.

通过对一个加工实例的分析与探讨，给出了一套加工中心加工可转位式盘状铣刀刀体的加工工艺方案及数控编程方法。

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