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根据国家标准总局和农业机械部八○年下达的任务,往复式内燃机铸造铝活塞金相检验国家标准修订工作会议于1981年12月27日至29日在上海召开。参加会议的有一机和农机系统的有关科研单位、主机厂、配件生产厂10个单位18名代表。会议首先听取了上海内燃机研究所对66年试行的活塞金相检验国家标准草案修订情况的汇报。与会代表一致认为与“内燃机铝活塞技术条件”国家标准（GB1184—74）相配套的“铸造铝活塞金相检验国家标准试行草案”,十几年来对我国中小功率内燃机铝活塞的生产和产品质量控制起到了一定的指导作用。同时,会议对原试行草案（第二次报批稿）的主要修订内容归纳如下: 1、对铸造共晶铝硅合金规定为“钠盐变质”。近几年来,我国部分活塞厂应用磷变质剂,其显微组织与应用钠盐变质剂所产生的显微组织完全不相同。故除了对原试行草
In accordance with the tasks assigned by the State Bureau of Standards and the Ministry of Agricultural Machinery in 1980, the meeting on revising the national standards for metallurgical inspection of aluminum piston for reciprocating internal combustion engines was held in Shanghai from December 27 to 29, 1981. There are 18 representatives from 10 units participating in the conference, including relevant scientific research units of one machine and agricultural machinery system, main engine factory and parts manufacturing plant. The meeting first listened to the report of Shanghai Internal Combustion Engine Research Institute on the revision of the 66-year pilot national standard for piston metallographic examination. Participants at the meeting agreed that the “national standards for internal combustion engine aluminum piston” (GB1184-74) match the “casting aluminum piston metallographic examination of national standards draft”, more than a decade of China’s small and medium-power internal combustion engine aluminum piston production and product quality Control has played a guiding role. At the same time, the meeting summarized the main revisions of the original draft (second draft for approval) as follows: 1. The regulation on the casting of eutectic Al-Si alloy is “sodium salt deterioration”. In recent years, part of the Pistons plant application of phosphorus modifier, the microstructure and application of sodium salt metamorphic agents produced by the completely different microstructure. Therefore, in addition to the original trial grass