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七里河农机一厂,经过批林批孔运动,广大职工焕发了冲天的革命干劲,克服了原材料、加工设备及技术力量等方面的困难,努力奋战,试制成功了十二马力小链轨拖拉机。经试车鉴定,证明该拖拉机牵引力大,适于山区小块地耕作,深受贫下中农欢迎。 为了提高拖拉机的使用寿命,拖拉机上许多重要受力及磨损另件(如链轨板、驱动轮、支重轮等)都应采用球墨铸铁制作。因此球墨铸铁的质量对拖拉机质量有着重大影响。但是,在如何提高球墨铸铁的质量上却遇到一些问题:
After a series of campaigns such as “Hole and Hole Bore Hole Campaign” and the vast number of staff and workers glowed in the mighty revolutionary drive to overcome the difficulties in raw materials, processing equipment and technical forces, the Company successfully struck a successful 12-horsepower small-track tractor. The test car identified that the tractor traction, suitable for small mountain farming, welcomed by the poor middle peasants. In order to improve the service life of the tractor, many important components of the tractor that are subject to stress and wear (such as chain plates, drive wheels, track rollers, etc.) should be made of ductile iron. Therefore, the quality of ductile iron has a significant impact on the quality of the tractor. However, there are some problems on how to improve the quality of ductile iron: