The working efficiency of rock drilling tools will be affected by these factors
In addition to the correct selection of cemented carbide grades, rock drilling efficiency is also affected by many factors, mainly the shape of the drill bit, rock hardness, blast-hole diameter and blast-hole depth compression, powder discharge method, air pressure, etc.
Bit shape
The shape of the drill bit directly affects the section of the blast hole. The blast-hole section of most drill bit rock drilling is polygonal instead of round. Therefore, the polygonal cross-section is formed when the drill head rotates along its own axis and is biased to the side of the gun limit. During rock drilling, the drill rod does not rotate on a fixed axis, but swings freely in the borehole. This situation can be seen in actual supply as long as you observe carefully. The shape of the bit is different, and the section of the blast hole obtained during rock drilling is also different.
rock properties
Rock properties that affect rock drilling speed are mainly viscosity, hardness and elasticity. The viscosity of a rock is the ability of the rock to resist breaking into smaller pieces. The viscosity of the rock is related to the composition and composition of the rock; the size and shape of the particles; the quantity, composition and moisture content of the cement. Tight and homogeneous rocks have the same viscosity in all directions, while heterogeneous or layered rocks have different viscosities in all directions. The hardness of the rock is also the same as the viscosity, which is determined by the connection force between the rock particles. However, the hardness of rock is its ability to resist drilling into it with sharp tools. The elasticity of rock refers to its ability to return to its original shape and volume after the external force acting on the rock disappears. All rocks are elastic. The elasticity of the rock has a significant impact on percussive rock drilling.
