Relief making on bearing sleeve surface by eccentric burnishing

The article describes how to obtain regular depressions in hole surfaces by means of eccentric burnishing. The principle of the method was explained and the mathematical formulae showing the relations among the process parameters were derived. A formula enabling the choice of the rotational speed of the burnishing head with regard to the (required) machining trace coverage of the surface was given. The structure of a head used for eccentric burnishing of bearings sleeves was described. Experiments checking the possibility of making various reliefs confirmed the practical application of the head. The investigation of the extent of tribological wear of steel/steel and steel/bronze sliding contacts were carried out. It showed explicitly that the specimen with oil pockets obtained by eccentric burnishing show much less wear than diamond turned ones.