采用金刚石铰刀加工阀孔，生产率高，刀具寿命长，表面粗糙度低。
The machining of valve bore with diamond reamer features high productivity, long service life of reamer and lower surface roughness.
金刚石铰刀具有加工精度高、表面粗糙度小、加工效率高、寿命长等优点，能很好满足高精度内孔加工的要求。
The diamond reamer has such advantages as higher machining precision, minimum surface roughness, higher efficiency and longer service life.
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