射砂紧实方法在机械化铸工车间已获得广泛应用。但人们至今并未真正掌握射砂机构工作的实质。这是因为:①射砂过程是在一开式系统中进行的非稳定瞬变过程,其中射砂头充气到最高气压时间仅为0.03～0.06秒;②射砂过程还伴随气体滤流,混合料塑性变形等现象的发生。因此,射砂过程是一复杂的热力学、空气动力学与松散介质动力学过程。 Shoot compacting method in the mechanized foundry workshop has been widely used. However, people have not really mastered the essence of the work of shooting sand bodies. This is because: ① Shot blasting process is an unstable transient process in an open system, in which the shot blasting time is only up to 0.03 ~ 0.06 second; ② Shot blasting is also accompanied by gas filtration and mixing Plastic deformation and other phenomena occur. Therefore, the shooting process is a complicated process of thermodynamics, aerodynamics and loose medium dynamics.