清洗作业占汽车大修总劳动量的4％左右。清洗送修的发动机零件时,最大的劳动量就是清除灰渣、水垢、积炭和焦油等污垢。由于零件的外形复杂,零件上存在有难以接近的沟槽和小尺寸的不透孔,清洗过程就困难得多。根据苏联拖拉机及农机运修工艺科研所的建议,各修理企业开始采用热化学清洗方法清洗零件,这种方法最近得到了普 Cleaning operations accounted for about 4% of total vehicle overhauls. When cleaning engine parts for repair, the maximum amount of labor is to remove dirt such as ash, scale, coke and tar. Due to the complex shape of the part, the presence of inaccessible grooves on the part and imperfect holes in small dimensions, the cleaning process is much more difficult. According to the Soviet Union tractors and agricultural machinery repair technology research institute recommendations, the repair companies began to use thermochemical cleaning method to clean the parts, this method has recently been general