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The study introduces a new method of microporous boring machining process for high-precision.First,it is difficult to get better surface quality of microporous with micro cutting technology.Second,using again boring processing methods and the reasonable process parameters can improve greatly the quality of microholes.The 3J33 martensite steel is boring with small holes Ф2.7mm through process optimization, so that the size precision of the hole can be IT4, surface roughness is up to 0.2 μm . Compared with drilling, boring hole surface quality improves significantly, the roughness value decreases 0.8 μm , the shape error is significantly improved.The results show the new optimization method of micro hole boring processing can guarantee the dimension precision and shape precision ,obtain better surface quality.

A new optimization method of high-precision microporous boring machining process