The drill bit is a direct tool for rock breakage. The rate of penetration is closely related with the drill bit as well as the mechanical properties of the rocks.
钻头是直接破碎井底岩石的工具，钻井速度的快慢不仅与钻头有关，而且与所钻岩石的力学性质密切相关。
The invention relates to a handheld electrical tool (1) in particular drill, rock drill or hammer drill.
本发明涉及一种手持式电动工具机（1）尤其是钻机、冲击钻机或者锤钻。
In rock drilling process with percussion-rotary drill rotating drilling tool bears two toques: dynamic torque which drives drilling tool into rock mass, and resistance torque of rock mass.
前言：在冲击—回转式凿岩机向岩石钻进过程中，旋转中的钻具承受着两种力矩的作用：一是驱动其旋转的动力矩；二是被钻岩石阻止其旋转的阻力矩。
In rock drilling process with percussion-rotary drill rotating drilling tool bears two toques: dynamic torque which drives drilling tool into rock mass, and resistance torque of rock mass.
前言：在冲击—回转式凿岩机向岩石钻进过程中，旋转中的钻具承受着两种力矩的作用：一是驱动其旋转的动力矩；二是被钻岩石阻止其旋转的阻力矩。
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