分析了无模样和有模样紧实后型砂强度分布的差异，以及回弹现象和“桥”的产生机理。
The differences of the distribution of the moulding sand strength after compacting with pattern or not as well as resilient phenomenon and the mechanism of appearing "bridge" were analysed.
回弹现象是车辆覆盖件冲压成形中不可避免的问题，也是该领域研究的热点和难点问题。
Springback is an inevitable problem in sheet metal stamping forming, and is the research hotspot and difficulty in this field.
本文对双轴柔性滚弯技术原理进行了分析，对工件的回弹现象及其回弹规律进行了比较深入的研究，得出工件的回弹公式；
The principle of TABTER has been analyzed firstly and the formula of bending springback has been obtained from deep research on bending springback phenomenon and rule of workpiece.
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