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.
从汽车覆盖件拉深工艺设计依据到设计原则的分析，确定了正确的汽车覆盖件拉深工艺的方案，有效地避免覆盖件的起皱、开裂、拉毛和回弹现象。
To analyze the draw craft of overlay of automobile, make to sure the draw craft of overlay of automobile, availably avoid the phenomenon of cockling, crazing, burr and flipping.
回弹是板材成形过程中不可避免的一个普遍现象，直接影响到冲压件的尺寸精度和零件最终形状。
Springback is an inevitable and universal phenomenon in sheet metal forming, which may affect the tolerance and final shape of stampings.
回弹是卸载过程产生的反向弹性变形，是板料冲压成形过程中存在的一种普遍现象。
Springback is a common phenomenon in sheet metal forming, caused by the elastic redistribution of the internal stresses during unloading.
回弹是弯曲成形中普遍存在的现象，实践证明采用拉弯工艺可以有效地减小回弹，从而达到提高成形精度的目的。
Springback is a common phenomenon in bending process. It has been proved that stretch bending can decrease the springback effectively, which can improve the forming precision.
回弹是弯曲成形中普遍存在的现象，实践证明采用拉弯工艺可以有效地减小回弹，从而达到提高成形精度的目的。
Springback is a common phenomenon in bending process. It has been proved that stretch bending can decrease the springback effectively, which can improve the forming precision.
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