在分析各国整体切削具不提钻可换式钻头结构及存在主要问题的基础上，提出采用整体旋转切削具可换式钻头。
Based on analyses about the structures and existing problems of integrally retractable alternative cutting element bits, a integrally rotary replacing cutting element bit was proposed.
在分析各国整体切削具不提钻可换式钻头结构及存在主要问题的基础上，提出采用整体旋转切削具可换式钻头。
Based on analyses about the structures and existing problems of integrally retractable alternative cutting element bits, a integrally rotary replacing cutting element bit was proposed.
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