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该法使用一种气体介质,它以高速作用到松散型砂上表面的压力波来紧实型砂〔参见西德专利DE—OS 30 25 99 3 及DE—OS 29 49 34 0〕。为了产生垂直型砂表面作用的压力波,本专利中,压力介质可均匀地从靠近型砂、并遮盖着松散型砂整个上表面的底板2中射出。底板2带有若干可以关闭的孔3。利用可以对模板4作相对运动的底板2就可以容
This method uses a gaseous medium which compacts sand with high-speed pressure waves applied to the upper surface of loose sand (see DE-OS 30 25 99 3 and DE-OS 29 49 34 0). In order to create a pressure wave that acts on a vertical sand surface, the pressure medium in this patent is uniformly ejected from the bottom plate 2 near the molding sand and covering the entire upper surface of the loose sand. The base plate 2 has several holes 3 that can be closed. The base plate 2 can be moved by relative movement of the die plate 4