论文部分内容阅读
为了提高柴油机的升功率及其寿命,提出了要大大改善气缸一活塞组零件(特别是铸铁气缸套)材料的任务。影响气缸一活塞组件寿命和可靠性的运用缺陷有擦伤、严重的磨损和疲劳裂纹,这些缺陷的出现和迅速扩展,往往与铸铁件的宏观、微观组织缺陷有关。运用数据、工厂验收试验数据、金相研究以及机械性能和耐磨性试验数据的统计分析表明,在每一运用期内,大多数报废的气缸套都相当于一定水平的铸铁质量。在走行15万公里以内的开始运用阶段报废的气缸套,与标准存在很大的差异。气缸套的典型缺陷是擦伤(达30％)和安装孔处的裂纹(达15％)。走行30万公里
In order to improve the lift power and life expectancy of diesel engines, the task of greatly improving the material of the cylinder-piston assembly (especially the cast iron cylinder liner) has been proposed. Defects that affect the life and reliability of cylinder-piston assemblies include galling, severe wear, and fatigue cracking. The appearance and rapid expansion of these defects are often associated with macro and microstructural defects in castings. The statistical analysis of the data, factory acceptance test data, metallographic studies, and mechanical and abrasion resistance test data shows that most scrap cylinder liners are equivalent to a certain level of cast iron quality during each service life. There is a big difference from the standard in the cylinder liner that has been scrapped within the first 150,000km of running. Typical defects in cylinder liners are scratches (up to 30%) and cracks in mounting holes (up to 15%). Travel 300000 km