The deep well coal road cable of small diameter hole and high pre-tension structure and craft were studied according to the condition of high stress and composite roof in Fengcheng coal field.
结合丰城矿区高地应力、合顶板等复杂地质条件，研究深井条件下煤巷锚索采用小孔径、加高预应力的结构形式和施工工艺。
This paper introduces the technology of broaching accurate, small deep hole and the design of broaching tool as well as its parameter's selection.
介绍用拉削加工精密小深孔的工艺方法及拉刀的设计、参数的选择。
This paper introduces the technology of broaching accurate, small deep hole and the design of broaching tool as well as its parameter's selection.
介绍用拉削加工精密小深孔的工艺方法及拉刀的设计、参数的选择。
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