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二、材料与工艺所决定的曲轴抗力——NJ-70发动机球墨铸铁曲轴强度研究曲轴的制造材料与工艺决定了曲轴的抗力,曲轴的抗力虽然是非主要方面,但到另一发展过程时,它可以上升为支配的地位,例如铸造曲轴的出现,促使了它的空心结构的发展。近年来球墨铸铁获得了广泛的应用,南京汽车制造厂、无锡柴油机厂以及上海、杭州、北京、天津、大连等地的发动机厂和配件厂,都先后采用了球墨铸铁曲轴。为了进一步研究采用低强度材料施以局部强化来提高应力集中处的抗力的合理解决曲轴强度的途径,以及研究适于球铁曲轴的强度计算方法,用NJ-70发动机曲轴做了一系列试验。
Second, the crankshaft resistance determined by the material and technology - NJ-70 engine ductile iron crankshaft strength Crankshaft manufacturing materials and processes determine the resistance of the crankshaft, although the crankshaft resistance is non-major aspects, but to another development process, it Can rise to the dominant position, for example, the emergence of casting crankshaft, prompting the development of its hollow structure. In recent years, ductile iron has obtained a wide range of applications. Nanjing Automobile Factory, Wuxi Diesel Engine Factory and engine plants and parts factories in Shanghai, Hangzhou, Beijing, Tianjin and Dalian all adopted ductile iron crankshafts successively. In order to further study the reasonable solution of crankshaft strength by applying local strengthening to improve the resistance of stress concentration region by using low-strength materials, and to study the calculation method of strength for ductile iron crankshafts, a series of tests were carried out on the crankshaft of NJ-70 engine.