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内燃机车Д100发动机大型曲轴长6000毫米以上,主轴颈和连杆颈直径分别为200毫米和160毫米。一个毛坯的重量为1147公斤。曲轴采用球墨铸铁制造,其性能和组织应满足下表所列的要求。主要条件是要获得珠光体基体。保证规定的金属基体组织的措施是在850～900℃时从铸型内取出毛坯,然后空冷。这一作业是曲轴制造工艺中最费时的。同时过早开箱会引起翘曲,随后并要在热处理炉内进行铸件校直,以及在机械加工时进行平衡。在工厂条件下由于没有必要的设备而采用一般正火(反复加热、保温和冷却)是不
Diesel engine Д100 engine large crankshaft length 6000 mm above the main journal and connecting rod neck diameter of 200 mm and 160 mm. The weight of a blank is 1147 kg. Crankshaft made of ductile iron, its performance and organization should meet the requirements listed in the table below. The main condition is to obtain the pearlite matrix. To ensure the provisions of the metal matrix organization measures are taken from the mold at 850 ~ 900 ℃ blank, and then air-cooled. This job is the most time-consuming crankshaft manufacturing process. At the same time premature unpacking can cause warping, followed by casting alignment in the heat treatment furnace and balancing during machining. Normally normalized (repeated heating, holding and cooling) at factory conditions due to lack of equipment necessary