Recently,the machine Luoyang Bearing Science and Technology Co.,Ltd.is a domestic military enterprises successfully developed the largest friction welding machine bearings.This high-precision thin-walled cross bearings cylindrical roller bearings,diameter 4752mm,the inner diameter of 4200mm,P5-level precision,is the largest friction welding machine bearings.In order to meet the technical requirements of users,project teams in product development,manufacturing,testing and other aspects of strict control,so that all the indicators reached P5,which is much higher than other indicators hop path P5 level.Bearing in machine manufacturing company has fully mastered the bearing friction welding technology.