Threaded Button Bit Design Selection Guide for Different Rock Formations
Threaded Button Bit Design Selection Guide for Different Rock Formations
High performance threaded button bits are core tools for rock drilling operations. While tungsten carbide button grade is a key factor affecting bit service life, reasonable drill bit structural design and model selection directly determine drilling efficiency, hole straightness and overall drilling quality. Based on years of production and overseas sales experience, we sort out a practical formation matching selection guide for global drilling contractors and engineering buyers.
Core Differences Between Two Main Carbide Button Types
The shape of carbide buttons is the core of bit performance adaptation, suitable for different rock hardness and drilling scenarios :
- Spherical Buttons : Featuring low exposed height, these buttons deliver excellent wear resistance and anti chipping performance. They are specially customized for ultra hard rock formations (F14 and above). Low drilling speed is recommended to avoid button damage and extend bit lifespan in harsh working conditions.
- Ballistic Buttons : With higher exposed height, ballistic buttons boast strong cutting capacity and fast drilling speed. They fit soft and medium hard rock below F12 perfectly. Note that this button type is prone to chipping when applied to hard rock formations.
Professional Selection of Threaded Button Bits by Rock Condition
1. Soft Rock Drill Bits
Ideal for non abrasive, unbroken soft rock with hardness F≤8. Adopting drop center face design and small diameter configuration, equipped with semi ballistic or full ballistic carbide buttons. This structural design optimizes rock slag discharge efficiency, greatly improving drilling productivity while maintaining stable wear resistance of carbide components.
2. Medium Hard Rock Drill Bits
Applicable to conventional medium hard rock with hardness ranging from F8 to F14 (non abrasive). Equipped with flat face structure and standard spherical carbide buttons. The matched design balances impact resistance and wear resistance, ensuring stable and continuous drilling in conventional engineering rock formations.
3. Hard Rock Drill Bits
Tailored for ultra hard rock formations with hardness F≥14. Adopting large size spherical carbide buttons, the bits feature upgraded impact resistance and extreme wear resistance to cope with high strength rock cutting. Due to the larger button diameter and premium material configuration, the production cost is slightly higher than standard bits, which is the optimal choice for heavy duty hard rock drilling.
4. Abrasive Rock Drill Bits
Specially developed for high abrasive quartz rock and strongly abrasive formations. Designed with enlarged button diameter and height, plus a smooth bit face structure. This innovative design realizes fast and smooth rock slag removal, effectively reducing abrasive wear on bits and significantly improving overall durability in high wear drilling scenarios.
5. Retractable Threaded Drill Bits
Perfect for fractured rock, gap containing and variable formations. Featuring drop center face and retractable integrated structure, the bits support quick disassembly of drill rods and bits. They solve the construction difficulties of complex and changeable rock layers, improving construction flexibility and maintenance efficiency for variable geological drilling projects.