对于因“滚瓦”而损坏了主轴孔的机体,是发动机大修中较为困难的问题之一。机体是发动机的骨架、而主轴孔处则是运动件的中心,这里受力很大,震动剧烈,精度要求高。因此,必须采用合适的修理方法,方能满足要求。我们先后成功地大修了三台“滚瓦”的发动机;前两台是日本的VB220马力发动机,采用了焊接修复法;后一台是NT855-C335发动机,采用了粘接修复工艺。 One of the more difficult problems in engine overhaul is to damage the body of the spindle hole due to “rolling.” The body is the skeleton of the engine, and the spindle hole is the center of the moving part, where the force is great, the vibration is violent, and the precision is high. Therefore, proper repair methods must be used to meet the requirements. We have succeeded in overhauling three “rolling-tile” engines; the first two are Japanese VB220 horsepower engines, which use the welding repair method; the latter is the NT855-C335 engine, which uses a bonding repair process.