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一、七○砂的水爆性能概述七○砂这项新生事物,在党的亲切关怀下,克服了一个又一个的困难,正在茁壮成长,在生产工艺上也正在完善。但很多兄弟工厂也都反映七○砂不能水爆或水爆率很低。特别对于薄壁封闭型铸钢件的水爆,内部犯芯更不易爆出。由于水爆不良,增加了下道工序的困难,直接影响了七○砂的推广使用。为此,我们遵照伟大领袖毛主席“实践出真知”的教导,进行了反复试验,终于找到了解决七○砂水爆问题的办法。
First, the water quality of the 700 sand Overview 7000 sand this new thing, under the cordial concern of the party, to overcome one after another difficulties, is thriving, in the production process is also improving. However, many of the brothers’ factories also reflect that the sand can not be burst or the water burst rate is very low. Especially for the thin-walled closed castings of water, the inner core is more difficult to break out. Due to poor water burst, the difficulty of the next process is increased, which directly affects the popularization and utilization of 700 sand. For this reason, we conducted repeated tests in accordance with the teachings of Chairman Mao, the great leader, “practicing truthfulness,” and finally found a solution to the problem of the water burst in the 1970s.