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本文提出了表征砂型回弹倾向和型砂发生回弹能力大小的理论公式，对回弹的机理进行了探讨，认为由于型砂砂粒间粘土膜发生弹性变形积蓄了应变能，在卸荷时此应变能释放出来，使型砂产生了回弹，并提出用回弹势能这一新的型砂性能检测参数来测定型砂的回弹性能
In this paper, the theoretical formula to characterize the propensity of sand to rebound and the resilience of sand to be generated is presented. The mechanism of springback is discussed. It is considered that strain energy is accumulated due to the elastic deformation of clay sand between sand particles. Released, so that the sand produced a rebound, and proposed the use of rebound potential energy of the new sand performance testing parameters to determine the resilience of sand