TRIAL-MANUFACTURE AND PRODUCTION OF PRECISION OILIMPREGNATED BEARINGS WITH MULTI-STEPS USED IN DUPLICATING MACHINE

The trial-manufacture and production status of precision oilimpregnated bearings with multi-steps for transmission in duplicating machine have been introduced,The reasonable process of making the products of this kind has been put forward.It is known by analysizing the structure and precision that the key point of technique lies on the control of green density and sizing process. Therefore, a ram with floating structure and automatic die have been designed for the homogeneous distribution of density in parts. Furthermore, final precision requirements can be met by the positioning fix of inner hole and flat contour of parts and by all-round coining.