In this paper, an approximate method of using three tangent arcs to substitute the involute gear profile curve is put forward.

提出用圆弧来代替渐开线齿形的近似方法，实现了渐开线齿轮三维实体造型的直接编程生成技术。

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Accurate reconstruction of planar contour mixed with straight lines and arcs is achieved with position or tangent continuity.

解决了由直线和圆弧构成的平面轮廓精确重构问题，满足轮廓各段之间位置连续以及相切条件。

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