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在无心磨削中，如何同时保证棱圆和椭圆是比较困难的。分析了三角棱圆产生和变形的原因，提出了解决棱圆和椭圆这对矛盾的具体方法。
In the unmotivated grinding, how to guarantee both the edge and the ellipse is more difficult. The causes of triangular prism generation and deformation are analyzed, and the specific methods to solve the contradiction between prism and ellipse are put forward.