punch-nose radius

The springback angle increases with the increase of the punch round radius and clearances between the punch and the die while decreases with increase of the blank holder force, sheet thickness, friction coefficient and material hardening exponent.

回弹角随凸模圆角半径和凸凹模间隙的增大而增大，随压边力、板料厚度、摩擦系数和材料硬化指数的增大而减小。

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The limit dome height increased with the increase of punch radius.

极限成形高度随凸模圆角半径的增大而增大.

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Each section curve is regarded as a spline curve, then make use of springback simulation result after unloading of the spline and some modified value such as friction, clearance, press margin power and round radius of punch to predict each section springback.

每个截面曲线看成样条曲线，由样条卸载后的回弹仿真，加上利用神经网络法预测成形中摩擦、间隙、压边力、凸模圆角半径等影响的修正量来预测每个截面的回弹。

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