Rock drill bits are one of the most important tools used for rock drilling and are widely used in many fields, such as mining, tunnel penetration, and municipal facilities. There are many types, and different scenarios require different specifications of rock drill bits. Among them, the diameter of the rock drill bit is directly related to the efficiency and quality of rock drilling. Therefore, when selecting a rock drill bit, it is necessary to reasonably determine its diameter to ensure rock drilling speed and mining cost.

First, it is necessary to determine the diameter of the rock drill bit according to the specific conditions of rock drilling. If the geology is hard, the diameter of the drill bit needs to be relatively large, which can improve the efficiency of rock drilling. If the geology is relatively soft, the diameter of the drill bit can be reduced so that the depth and direction of rock drilling can be better controlled.

Secondly, the strength and durability of the rock drill bit also need to be considered. A drill bit with too large a diameter often leads to insufficient strength and easy damage, while a drill bit with a too-small diameter is prone to breakage and other problems. Therefore, when selecting the diameter of the drill bit, it is necessary to determine a reasonable size according to the material and design to ensure the strength and durability of the drill bit.

Third, do not ignore the influence of the geometric parameters of the drill bit on the diameter. If the geometric structure parameters of the drill bit are designed reasonably, the radial wear resistance of the drill bit will be enhanced, and the initial diameter of the drill bit can be selected to be smaller.

Combined above, there are four indicators that can be used as a reference to determine the size of the diameter of the rock drill bit.

1. The minimum final diameter required for drilling powder discharge

2. The minimum final diameter required by the blasting charge

3. The initial diameter of the drill bit determined according to the radial wear of the grinding drill bit

The initial diameter of the drill bit must meet the minimum final diameter required for blasting charge and powder discharge. However, to ensure that the drill bit has a longer service life and improves the utilization rate of the carbide button, the determination of the initial diameter must consider the radial wear of the drill bit each time.

4. Drill bit diameter compatible with impact energy

Different drill hole diameters and different types of drill bits should take different impact energy to ensure that the impact energy per unit edge length of the drill bit is the optimal value.

Rock drill bit diameter is one of the main factors affecting rock drilling speed. Reducing the diameter of the drill bit within a range is conducive to improving the chisel speed and blasting effect and reducing the cost of steel and cemented carbide. To ensure that the drill bit has a longer service life and improve the utilization rate of the carbide button, it is necessary to increase the grinding times of the drill bit, and the diameter of the drill bit should not be too small; to ensure that each part of the drill bit does not fail early, the diameter of the drill bit must be It is compatible with the impact energy of the rock drilling machine. In addition, it is necessary to ensure that the skirt body wall has a thickness for the tapered bit. To make the rock powder discharge smoothly, the difference between the size and the end of the drill bit must be higher than the value, so the diameter of the drill bit should not be too small.

To sum up, the diameter of the drill bit is subject to many conditions. A reasonable drill bit diameter can improve the efficiency and quality of rock drilling, reduce damage and waste, and thus bring more value to the engineering project. Therefore, we should reasonably determine the diameter of the drill bit.