六机部于五月廿三日至甘九日在北京召开了型砂、铸造车间主任会议。与会代表对型砂、加强铸造车间管理、不断提高产品质量问题进行了经验交流和热烈讨论。普遍认为由上海交大铸造教研室研制成的“JD—1复交砂”和由上海沪东造船厂,六机部十二研 Six machines from May 23 to May 9 in Beijing held a sand, casting workshop director meeting. Participants on the sand, strengthen the management of foundry, and continuously improve the quality of products for the exchange of experience and heated discussions. It is generally believed that the “JD-1 complex sand” developed by the Shanghai Jiaotong University Foundry Teaching and Research Office and the research institute of Shanghai Hudong Shipyard,