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九九九厂一车间铸造班铸造出来的铸件,质量较差,强度极限O°只能达到7公斤/平方毫米。推广优选法后,铸造班同志遵照毛主席“分析的方法就是辩证的方法”的教导,对炉料配方进行了系统的分析,得出回炉铁和锰铁的加入量是影响铸件强度的主要因素。这是一个双因素的问题,他们先固定锰铁加入量为4斤,在100～150斤范围内优选回炉铁加入量,按0.618取第一试验点,为136.9斤,试验结果极限强度提高到11公斤/平方毫米,对应于0.618的点在120斤附近,没有做,所以取150斤为第二试验点。试验结果,极限强度又提高到13.7公斤/平方毫米。
The castings cast by the foundry of a 1999 workshop have poor quality and the strength limit of O ° can only reach 7 kg / mm 2. Following the promotion of the Law of Choice, casting class comrades, following Chairman Mao’s “analytical method is a dialectical method”, conducted a systematic analysis of the charge formulation and concluded that the addition of iron and ferromanganese is the main factor affecting the strength of the castings. This is a two-factor problem, they first fixed amount of ferromanganese 4 kg, in the range of 100 to 150 kg preferred amount of recycled iron, 0.618 take the first test point, to 136.9 pounds, the ultimate strength of the test results increased to 11 kg / mm2, corresponding to 0.618 points in the vicinity of 120 pounds, did not do, so take 150 pounds for the second test point. Test results, the ultimate strength has increased to 13.7 kg / mm2.