第二汽车制造厂生产的QT40—10球墨铸铁件,质量要求严、产量大。这样大规模、严要求的球铁流水生产,对我们是一个新课题。第二汽车制造厂以前曾采用冲入法球化工艺,由于铁水运输和浅注耽搁时间较长,衰退和降温问题非常突出,影响球铁材质的稳定。周期性处理又难于适应连续浇注,组织流水生产较困难。因此,迫切需要寻求一种新工艺。第二汽车制造厂铸造二厂和沈阳铸造工艺研究所,于1974年初在党委领导下,组成以工人为主体的三结合试验组。一年多以来,以阶级斗争为纲,认真学习无产阶级专政理论,依靠群众,独立自主,自力更生,开展了型内球化工艺试验。试验组以严格的科学态度,共进 QT40-10 ductile iron castings produced by the second automobile factory have strict quality requirements and large output. Such a large-scale, strict requirements ductile iron and water production, to us is a new topic. In the past, the second automobile factory had adopted the technology of infiltration and balling. Due to the long delay of hot metal transportation and shallow injection, the problem of recession and cooling was very prominent, which affected the stability of the ductile iron material. Periodic treatment is difficult to adapt to continuous casting, tissue production is more difficult. Therefore, there is an urgent need to seek a new process. Second Automobile Works Foundry Plant and Shenyang Institute of Foundry Technology, in early 1974 under the leadership of the party committee, composed of workers as the main three combined test group. Over the past year or so, taking the class struggle as the key link, studying proletarian dictatorship theory conscientiously, and relying on the masses, being independent and self-reliance, we conducted a type of ball-in-ball technology test. The experimental group with strict scientific attitude, work together