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在以农业为基础、工业为主导,发展国民经济总方针指引下,我们试验组遵循毛主席关于“农业的根本出路在于机械化”的教导,以球墨铸铁代替锰钢制造拖拉机的旋耕刀,进行了试验研究。三年来,除进行了一系列的成分、组织、性能及铸造、热处理工艺等试验外,还在50余台手扶拖拉机上用球铁刀进行了田间试验,旋土总面积达三万
Guided by Chairman Mao’s principle that “the fundamental road to agriculture lies in mechanization,” our experimental group, under the guidance of agriculture-based, industry-led and national economic development, guided the development of rotary tractors made of ductile iron instead of manganese steel The experimental study. In the past three years, in addition to carrying out a series of experiments on the composition, organization, performance, casting and heat treatment, more than 50 tractor units were used to carry out field trials with a ball iron knife, with a total area of 30,000