In mining, geological exploration, and other engineering fields, the choice of carbide drill bits directly impacts rock drilling efficiency, cost control, and equipment longevity. Selecting a reasonable drill bit diameter can increase rock drilling speed, reduce material wear, and extend the drill bit’s service life. This article will discuss how to reasonably determine the optimal drill bit diameter to help the mining industry improve operational efficiency and economic benefits.
Introduction
Determining the rock drill bit diameter is a complex process that involves considering the rock drill’s performance parameters, the rock’s characteristics, and the drill bit’s geometric structure. Selecting the appropriate drill bit diameter can increase drilling speed and reduce the waste of alloys and steel, thereby saving costs.
The influence of drill bit diameter on rock drilling effect
The relationship between rock drilling speed and drill bit diameter
Generally speaking, people may think that reducing the drill bit diameter will increase the rock drilling speed, but this relationship is not absolute. Experiments show that under low air pressure, the appropriate reduction of the diameter of the drill bit will help to increase the drilling speed. However, under high air pressure or when drilling hard rock, a drill bit diameter that is too small will result in a decrease in drilling speed.
The relationship between drill bit diameter and rock properties
Different rocks have different properties, such as abrasiveness and compressive strength, and have different requirements for the selection of drill bit diameter. For example, in highly abrasive rocks, thicker alloy sheets can provide better wear resistance, allowing for the selection of a smaller initial drill bit diameter. In soft rocks with low abrasiveness, the thickness of the alloy sheet has less effect on wear, and the selection of drill bit diameter can be more flexible.
Effect of drill bit geometry on diameter
Alloy sheet thickness
Alloy sheet thickness is an essential factor affecting the drill bit’s ability to resist radial wear. Experiments show that the thicker the alloy sheet, the stronger the drill bit’s wear resistance, thus allowing the selection of smaller initial diameters. However, an alloy sheet that is too thick will also increase material costs, so it is necessary to find a balance between wear resistance and cost.
Drill bit shape and sheet layout
The drill bit’s shape (such as chisel bit and cross bit.) and sheet layout will also affect the choice of its diameter. Drill bits of different shapes are subjected to different forces when breaking rocks, so it is necessary to select the appropriate shape and sheet layout according to actual conditions.
Steps to reasonably determine the drill bit diameter
Determine the rock drilling conditions
First, it is necessary to clarify the specific conditions for rock drilling, including rock type, compressive strength, abrasiveness, rock drill model, air pressure, etc. These conditions will directly affect the selection of drill bit diameter.
Consider the requirements of blasting charges
The minimum final diameter required by the blasting charge is an essential reference for determining the drill bit diameter. Based on the diameter of the packet and the charge gap, we can calculate the required minimum final diameter.
Consider the number of grinding times and radial wear
To improve the utilization rate and service life of the rock drill bit, we need to consider the number of resharpening times and the amount of radial wear for each resharpening. Based on these parameters, we can calculate a reasonable initial diameter.
Match the impact energy of the rock drill
Different rock drills have different impact energies and a definite matching relationship between the drill bit diameter and the impact energy. Through experiment or calculation, we can find the diameter of the drill bit that matches the impact energy of the rock drill.
Comprehensively consider other factors
In addition to the above factors, it is also necessary to consider factors such as the powder discharge capacity of the drill bit, the wear resistance of the alloy sheet and the drill bit body, and the properties of the rock. After comprehensively considering these factors, we can determine a reasonable drill bit diameter range.
Conclusion
Reasonably determining the diameter of the rock drill bit is the key to improving rock drilling efficiency and reducing costs. By considering the performance parameters of the rock drill, the abrasiveness of the rock, the geometric parameters of the drill bit, and the grinding system, we can scientifically select the diameter of the drill bit to achieve the optimal drilling effect. In actual operation, it is also necessary to make flexible adjustments based on specific working conditions and continuously optimize the selection of drill bit diameter to adapt to complex and changing working environments.
