一、概述戚墅堰机车车辆厂在毛主席革命路线指引下,大胆创举用“70”砂代替水玻璃砂,初步试验成功,为我国铸造行业创出了一条新路。我厂对此项新工艺极为重视,今年四月份,组织三结合小组去戚墅堰机车车辆厂学习取经,并带回了一些石灰石砂,按照戚厂的配方及操作方法,进行了初步试验,结果情现良好。然后结合我厂具体生产条 I. Overview Qishuyan Rolling Stock Works under the guidance of Chairman Mao’s revolutionary line boldly pioneered the use of “70” sand instead of sodium silicate sand. The preliminary test was successful and created a new road for the foundry industry in China. I attach great importance to the new process of this new plant, in April this year, the organization of the three combined teams to Qishuyan rolling stock plant learn from, and brought back some of the limestone sand, according to Qi factory formulations and methods of operation, conducted a preliminary test results Now good. Then combined with my factory specific production