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材料为30Cr MnSiA的薄壁管件(壁厚2毫米左右),要求加工的孔径为ф40~(+0.13)毫米,光洁度达▽_7。被加工孔的细长比
Materials for 30CrMnSiA thin-walled tube (wall thickness of about 2 mm), processing requirements of the aperture ф40 ~ (+0.13) mm, finish ▽ _7. The slenderness ratio of the hole to be machined