optimum drilling efficiency
... 最佳钻井程序：optimum drilling program 最佳钻进效率：optimum drilling efficiency 最佳阻尼：optimal damping ...
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笔者主要阐述了数控深孔钻床在使用枪钻进行深孔加工时工艺参数的选择，寻求最佳加工性能，以求达到快速加工、提高效率的目的。
Hollow shaft type high pressure cooling system is used to solve the problem in deep drilling, as well as gun-drill with open groove, proper cutting consumption and single tool withdraw are applied.
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