Transversal and Longitudinal Crack from Down-the-hole Bit
A Down-The-Hole (DTH) bit, also known as a hammer bit, is a specialized drilling tool used in DTH hammer drilling. It is attached to the bottom end of the drill string and is responsible for the actual rock penetration during the drilling process. The DTH bit is designed to withstand the percussive forces and impacts generated by the hammer mechanism.
DTH bits typically consist of a steel body with multiple cutting elements, called buttons or inserts, embedded on the face of the bit. The buttons are made of hard and durable materials, such as tungsten carbide, and are strategically positioned to facilitate efficient rock breaking and drilling. The arrangement and shape of the buttons can vary depending on the specific drilling requirements and the type of rock formation being drilled.
The selection of the appropriate DTH bit depends on factors such as the hardness and abrasiveness of the rock, the desired drilling speed, and the specific application. Different types of DTH bits are available, including convex, flat, and concave face designs, each suited for different drilling conditions and rock formations.
DTH bits are subjected to intense forces and wear during drilling operations. As a result, they may require periodic inspection, maintenance, and replacement to ensure optimal drilling performance. Regular monitoring of the bit's condition, including the wear rate of the buttons, is important to maintain drilling efficiency and prevent premature bit failure.
LEANOMS DTH Drill Bits can even handle the hardest conditions, offering optimal solutionsfor drilling.
Each of our DTH drill bits is designed to resist the most difficult drilling circumstances. Drill bits from LEANOMS's selection are available for all popular DTH shank styles.
- Excellent drilling speed
- Superior durability
- Precise drilling
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The DTH Bit is crucial to drilling operations. The Drill Bit directly impacts on varying rocks, which sets the highest demands on the drill bit's quality. To prevent breakage or crack, the material should have strong fracture toughness, fatigue strength, and fracture strength. DTH Drill Bits should be tailored to withstand the most demanding drilling conditions. Multiple head shapes and button types can be designed for various projects and rocks. Operation-related considerations such as Increase feed force, Increase lubrication, etc
The following table is the cause analysis and remedial measures for Down-the-Hole Bit Transversal and Longitudinal Crack:
| Description | Cause | Remedy |
Transversal crack or breakage |
• Insufficient feed force | • Increase feed force |
| • Worn out chuck splines | • Replace chuck | |
| • Steel wear on the bit head | • Use correct drill parameters • Replace bit when worn out |
|
| • Insufficient lubrication | • Increase lubrication | |
| Longitudinal crack or breakage | • Too much water injected into the air | • Reduce the amount of water |
| • Foreign particles passing the hammer | • Blow pipes clean before connecting • Use thread protectors whenpossible |
|
| • Worn face on the piston | • Exchange the piston or machine the striking face of the piston | |
| • Insufficient feed force | • Increase feed force | |
| • Worn out chuck splines | • Replace chuck | |
| • Steel wear on the bit head | • Use correct drill parameters • Replace bit when worn out |
|
| • Insufficient lubrication | • Increase lubrication |
