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目前,有不少的汽车修理厂,因修理手段的限制,在更换发动机气缸套时,多采用锤击或用压力机压人的方法。此两种方法对半成品的缸套(镶入缸套后再进行镗削)是可行的,但对一些新型发动机的干式缸套(尤其是进口车的)就不可取了。这些发动机的干式缸套已是成品,其内外粗糙度Ra<0.8μm,壁厚仅1～2mm,按照装配工艺要求,需把它放入液氮气柜中冷却后方可镶入缸体承孔中。如果采用锤击或用压力机压入的方法,是极易使该缸套变形的,我们有过教训。
At present, there are a lot of car repair shop, due to the limitations of repair tools, the replacement of the engine cylinder liner, the more use of hammering or press pressure method. These two methods are feasible for semi-finished cylinder liners (boring in cylinder liners), but not for dry liners for some new engines (especially for imported vehicles). The dry cylinder liner of these engines is already finished, the roughness Ra of inside and outside is less than 0.8μm and the wall thickness is only 1 ~ 2mm. According to the requirements of the assembly process, it needs to be put into the liquid nitrogen gas tank and cooled before being inserted into the cylinder bearing hole in. If the use of hammering or press into the method is easy to make the cylinder deformation, we have learned.