The button bit is an indispensable tool in rock drilling engineering. It has the characteristics of high strength, high hardness, and good wear resistance. In rock drilling engineering, the function of the button bit is to drill, break, and dig into the rock. These bits find application in many scenarios, including mining ores, tunnel construction, and more. The significance of button bits in these applications is readily apparent. Consequently, it is crucial to grasp the precautions and maintenance procedures when using button bits to enhance their service life and drilling efficiency.
Definition and classification
A button bit is a tool component used in engineering fields such as rock drilling, coring, and geological exploration. It is mainly composed of a drill bit body and carbide buttons. According to the different structures and usage scenarios, there are many types of button bits, such as tapered button bits, threaded button bits, DTH button bits, etc.
Materials and characteristics
- Drill bit body: usually made of high-quality steel to ensure sufficient strength and toughness.
- Carbide buttons: this is the core part of the button bit, which is made of high-hardness and high-wear-resistant carbide. These buttons can efficiently break hard rocks under the action of impact and rotation.
- Features: for rock drills with higher impact power, button bits are more suitable than sheet-shaped insert drill bits. They offer higher rock drilling speeds, longer service life, and produce rounder hole types. In addition, button bits also have the advantages of long grinding cycles, fast drilling speed, reduced physical labor of workers, and accelerated engineering speed.
Specifications and Applications
The specifications of button bits are various, and the common ones are 28, 30, 32, 36, 38, 40, 42, 64, 76, 89 and other diameter sizes. They are applied widely in mining, railways, tunnels, highways, and other engineering construction. Especially in quarries, hydropower stations, tunnels, and other projects that require efficient drilling and coring, button bits are indispensable tools.
When choosing a button bit, select the appropriate model and size that aligns with the specific application and rock type. It ensures compatibility with tools like rock drills. The selection of different carbide shapes and bit sizes affects the effectiveness and efficiency of rock crushing methods. Therefore, operators should make selections based on the actual circumstances to facilitate the smooth execution of rock drilling projects.
Maintain appropriate propulsion
When drilling rock, it is necessary to maintain appropriate propulsion force and reasonably control the size and frequency of impact load to avoid excessive impact force causing damage or falling off of carbides. Over-impact load may also cause vibration and wear of the rock drill, affecting the service life of the equipment. At the same time, ensure that the drill rod and drill bit are tightly connected to prevent loosening during rock drilling.
Regularly check the wear of the drill bits
Button bits inevitably experience wear during use, so the operator needs to check the wear of the drill bit regularly. When severe wear of the carbides is detected, they should be promptly repaired or replaced. This preventive action helps prevent a decline in rock drilling efficiency and maintains product quality.
Keep cool
The rock drilling process generates substantial heat, and if the heat is not dissipated, it can lead to overheating and increased wear of the button bit. Consequently, it is necessary to use cooling water during the rock drilling to cool the bit and maintain its optimal performance. This practice helps ensure the button bit’s normal functioning and prolongs its lifespan.
Installation and disassembly
When installing the button bit, it’s crucial to ensure a secure and tight connection with the rock drill to prevent it from falling off during construction. When it comes to disassembling the button bit, follow these precautions:
- Stop the machine first.
- Allow the button bit to cool in the air for some time before disassembly. This cooling period is essential to prevent damage to the equipment caused by thermal disassembly. Proper disassembly procedures safeguard the equipment and the button bit for prolonged use.
Usage environment
Button bits are suitable for most rock drilling projects, but in some specific environments, such as high temperatures and corrosive environments, the use of the drill bit will be affected. In this case, it is necessary to take corresponding protective measures, such as selecting high-temperature and corrosion-resistant drill bit materials.
Regular inspection
Regularly checking for wear and ensuring the tightness of button bits is essential during use. If you notice that the carbide buttons are loose or significantly worn, it’s imperative to replace them promptly. Additionally, it’s crucial to inspect the connection parts of the rock drill to guarantee that they are secure and reliable. The behavior of maintaining the efficiency and safety of rock drilling operations involves a series of measures aimed at sustaining their effectiveness over time.
Regular lubrication
Regular lubrication and maintenance of button bits are vital for minimizing friction and wear. Typically, grease or lubricating oil is applied to coat the surface of the carbide button to ensure proper lubrication. This practice helps extend the lifespan of the button bits and maintains their efficiency during rock drilling operations.
Regular cleaning
During rock drilling, coolant and cuttings easily adhere to the surface of the button bit, and long-term accumulation will affect its heat dissipation and lubrication effects. To maintain optimum performance, it is significant to routinely clean the surface of button bits to remove any attachments.
Timely grinding and replacement
When carbide buttons on the button bit exhibit significant wear, they should be repaired or replaced promptly. During the grinding process, it’s essential to use professional grinding tools and wheels to avoid excessive grinding that may diminish the strength of carbide buttons. When replacing, opt for a new drill bit with the same shape and size as the original to ensure the smooth progress of the rock drilling project.
Conclusion
As an efficient rock drilling tool, button bits boast a lengthy service life and excellent drilling efficiency when used and maintained correctly. In practical applications, it’s significant to carefully select suitable materials and employ the appropriate operating methods to prolong the service life of button bits and enhance drilling efficiency. Additionally, adhering to safety guidelines and prioritizing personal safety is essential to prevent accidents during rock drilling operations.
