Based on analyzing the intersection curve between the rolled-piece and roll, the method of determining the nip point is put forward.

基于对轧件与轧辊截交线的分析，提出了在二维直角坐标系中确定轧件咬入接触点的方法。

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Then combined with teaching example, detailed analysis on intersection curve of normal revolution solid is provided, theoretical basis is advanced for computer graphics.

并结合实例，细致的分析了常见的回转体相贯线，为计算机绘图提供了理论依据。

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Then combined with teaching example, detailed analysis on intersection curve of normal revolution solid is provided, theoretical basis is advanced for computer graphics.

并结合实例，细致的分析了常见的回转体相贯线，为计算机绘图提供了理论依据。

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