1. The key surface layer is an inner circular surface, with a high standard tolerance level and a small roughness value Ra. Countermeasures adopted: Division of production and processing links, selection of processing technology lines: drilling-rough boring (expansion)-semi-precision boring (reaming)-fine grinding-fine polishing-grinding; select precision machines; operating tools are durable; adequate cooling.
2. Because the standard tolerance level of the outer circular surface is high and the roughness value Ra value is small, the countermeasures adopted are: the division of the production and processing links, the use of CNC lathes, and the durable operating level of the tool are the same as the production and processing of the inner circular surface. In addition, the processing technology line is: fine turning-half boring-fine grinding-fine polishing.
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