短语词组短语Implicit springback 显式动力学springback error 回弹误差Springback Distance 回弹距离springback gland 簧压密封curvature springback 曲率弹复springback k 反弹springback analysis 回弹分析springback angle 回弹角;弹复角springback amount 回弹量 返回 springback