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东风4型内燃机车用16V240ZB型柴油机的机体,采用铸钢主轴承座和钢板焊接的组合结构。六年来,我厂共铸造16V240ZA型和16V240ZB型柴油机用整体铸钢主轴承座近700台。早期产品的焊修工作量大、废品较多,在运用过程中产生裂纹。经过多年反复实践,摸索了一些规律,在改进铸件结构和铸造工艺后,尤其是1980年以来,16V240ZB型柴油机主轴承座的铸造质量已日趋稳定。一、主轴承座的结构特点和技术要求整体铸钢主轴承座为箱形结构,形状复杂,铸件的壁厚不匀、变化大(20～122毫米),热节多。根据设计技术条件,对铸造主轴承座的要求有:
Dongfeng 4 diesel locomotive 16V240ZB diesel engine body, the main bearing steel and steel welded combination structure. Over the past six years, our factory has co-cast nearly 700 units of main cast steel bearing blocks for 16V240ZA and 16V240ZB diesel engines. Early product welding workload, waste more, in the process of using cracks. After many years of repeated practice, groping for some laws, after improving the casting structure and casting process, especially since 1980, 16V240ZB type diesel engine main bearing housing casting quality has become increasingly stable. First, the main bearing structural features and technical requirements The overall cast steel main bearing box-shaped structure, complex shape, uneven casting thickness, large changes (20 ~ 122 mm), more hot section. According to the design of technical conditions, the requirements of the casting main bearing are: