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Several kinds of aviation oil pump unit of production have to graphite M106H as material ring sealing parts, type a letter on behalf of a SKF bearing the typical parts such as shown in figure 1. This part for end face seal working mode, B surface as the sealing surface, the surface of high precision. The processing of B surface, precision machining is not up to the requirements, and the graphite is a brittle material, also containing epoxy resin, and not grinding, after analysis, decided to adopt the grinding processing. In the absence of data reference case, the process test we to this kind of graphite parts are grinded, finally process ideal, reached the requirements of parts.
Part of the process route: rough turning, milling, grinding, fine car two slots of B surface.
From the above process route that the inner ring and the outer ring and the shaft, SKF bearing seat hole assembly together: B of grinding surface to ensure that the surface roughness of Ra0.1 m, 0.01mm parallelism, flatness 0.0006mm. The first uses the conventional dry grinding, the surface roughness and flatness of the two elements of the whole is not qualified, the measured flatness value competition up to required value of 4 ~ 7 times, that is 0.0024 ~ 0.0042mm.
Then from the material characteristics to analysis, M106H impregnated graphite, shore hardness 60, 117.6MPa compressive strength, flexural strength of 49MPa. Through the process test, using the micro layer extrusion principle. The specific method is: will the filtered powder and kerosene embedded grinding flat plate, and then the flat surface polishing paste powder of coarse grained cast, so that powder particles protruding plate surface polished, highly consistent. Then, the parts are placed directly grinding, in this flat plate so, on B surface was uniformly micro layer extrusion type cutting.
Parts in place for machining fine car, local collapse of sharp edge, the grinding process is as follows:
1) finishing field, make the environment clean. The importance of SKF bearings shall carefully check the higher grinding flat plate, the parts are thoroughly cleaned, this step is very important to guarantee the processing of success.