Abstract：Finite element analysis showed that hot-press sintered silicon nitride ceramic plunger parts, which with good performances, could effectively improve the performance of the engine oil pump compared with the metal plunger. However, high hardness and brittleness of ceramic materials made it particularly difficult to process ceramics, especially in the processing of holes. Based on analyzing the processing methods of holes, the ultrasonic vibration processing technique was used to process holes in silicon nitride ceramic plunger sleeve, developed the process planning of sleeve, designed the special fixtures and tools, and then described the processing of inlet and outlet oil holes and lubrication holes in detail. Observed by digital microscope, the quality of holes machined by ultrasonic vibration processing is very perfect compared with the holes in metal plunger sleeve.
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