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The Threaded Drill Bit 127-GT60 "Easy-Return-To-Plane" is a high-performance rock drilling tool that integrates advanced design concepts and manufacturing processes. Its model nomenclature and core technical essence warrant in-depth analysis.
The "127" in the model signifies the bit's nominal diameter of 127 millimeters. This is the core parameter determining the borehole size, directly impacting blast design parameters (such as spacing and burden) and the required formation dimensions for tunnels or slopes. "GT60" identifies its thread specification. The "GT" series thread is a widely recognized high-strength connection standard in the international drilling industry (coexisting with the common "R" series), renowned for its excellent fatigue resistance and good interchangeability. The "60" specifically defines key dimensional codes for pitch and thread form, ensuring the bit can achieve precise and secure engagement with drill rods of the same (GT60) specification, laying the mechanical foundation for efficient energy transfer. "Easy-Return-To-Plane" is the product's signature innovative technology. It is not merely a descriptive term but refers to a proprietary design feature aimed at optimizing the bit's working state throughout its entire service life.
During operation in harsh, abrasive rock conditions, both the steel body of a conventional drill bit and its cemented carbide button inserts wear simultaneously. Typically, the wear rate of the steel matrix outpaces that of the extremely hard alloy inserts, causing the buttons to gradually become overly protruding. This altered state changes the designed force application angles. Not only does it make the buttons more susceptible to chipping or shattering due to a cantilever effect, but it also induces unstable vibrations during drilling, ultimately leading to reduced penetration rates and borehole deviation. The "Easy-Return-To-Plane" technology is a systematic solution targeting this common pain point. Its technical principle lies in the precise control of material science and heat treatment processes to optimize the steel hardness and microstructure in the bit's head area. This achieves a scientific balance between the wear resistance of the bit body and the wear rate of the buttons. This enables the bit body and the buttons to achieve "synergistic wear" rather than the body undergoing passive, rapid loss. The result is that throughout extended use, the bit's working face can self-adjust, more readily maintaining or returning to a relatively flat, ideal fragmentation plane.
This technical principle delivers significant on-site advantages. Firstly, it enables higher drilling efficiency. A stable working plane ensures impact energy is released vertically and concentrically, reducing energy dispersion and harmful vibrations, thereby increasing pure penetration speed. Secondly, it achieves a longer service life. It effectively prevents premature damage to buttons caused by excessive protrusion, allowing all buttons to be consumed evenly toward their theoretical lifespan. Overall service life can be improved by 20% to 30%. Furthermore, it ensures better borehole quality. Straighter hole trajectories and smoother walls reduce the risk of stuck rods, providing excellent conditions for subsequent charging and blasting operations. Ultimately, these advantages converge into superior overall economic efficiency. The increased meterage per bit and reduced replacement frequency directly decrease downtime and tool consumption costs.
Beyond the "Easy-Return-To-Plane" highlight, the exceptional performance of the 127-GT60 bit is built upon the integration of multiple mature technologies. High-quality cemented carbide buttons utilize extra-coarse grain tungsten-cobalt alloy, optimizing impact resistance toughness by adjusting cobalt content while ensuring extreme hardness and wear resistance. Button shapes are optimized through fluid dynamics and rock mechanics simulations to balance rock penetration capability with their own durability. Scientific button layout design involves precise calculation and experimental validation for the 127mm diameter, covering the quantity, size, spatial arrangement (e.g., employing equal resistance distribution principles, reinforcing center buttons), and the inclination angles of each button. This aims to achieve full cross-sectional coverage of the borehole, eliminate re-crushing, and effectively control borehole roundness and straightness. Advanced welding processes (such as vacuum diffusion brazing) create a high-strength, defect-free metallurgical bond layer between the carbide buttons and the steel body, fundamentally eliminating the risk of button loss during operation. An efficient flushing system, achieved by rationally arranging multiple flushing holes in the bit's face, ensures high-pressure medium (air/water) can promptly and thoroughly remove drill cuttings from the hole bottom. This is key to maintaining high penetration rates and preventing accelerated tool wear and rod sticking. Finally, the bit body is made from premium alloy steel and undergoes strict heat treatment, allowing its core to retain high toughness to withstand repeated impacts while its surface gains high hardness to resist wear and corrosion.
Thanks to its versatile 127mm diameter and excellent performance, the GT60 threaded bit finds wide application across multiple engineering fields. In metal and non-metal mines, it is commonly used for underground medium-to-long hole production drilling, development drift driving, and dense drilling for cut slots. In various tunnel and underground projects, such as railway tunnels, highway tunnels, and hydraulic diversion tunnels, it serves as a primary tool for face drilling. In open-pit dimension stone quarries, it is used for drilling blast holes on production benches. Additionally, in foundation pit support and slope reinforcement projects within the infrastructure sector, it is frequently employed for drilling anchor cable and bolt installation holes.
To ensure the bit delivers optimal performance and safety, correct selection and matching are crucial. The primary principle is diameter matching—confirming that the required borehole diameter is 127mm. Next is thread matching—it is imperative that the bit's GT60 thread is completely consistent with the thread specification of the drill rods being used. Any mismatch can lead to connection failure, energy loss, and even cause equipment damage or safety incidents. Third is rock adaptability—this model is primarily designed for medium-hard to hard rock formations (e.g., granite, limestone, dense sandstone). For extremely tough, highly abrasive, or severely fractured ground, consulting the supplier for a specially reinforced variant may be necessary. Finally, equipment compatibility—it is specifically designed for medium to large fully hydraulic or pneumatic top hammer drilling rigs equipped with GT60 threaded drill rods.
Proper use and maintenance are essential for extending bit life and ensuring operational safety. During the correct break-in of a new bit, it is recommended to run it for a period at lower impact pressure and rotation speed to allow it to gradually adapt to the formation. For proper connection, always clean the connecting threads and tighten them to the recommended torque using a torque wrench. Applying specialized thread grease can prevent corrosion and reduce thread wear. Ensuring adequate flushing is a constant requirement; sufficient pressure and flow are guarantees for efficient cuttings removal and cooling. Regarding wear monitoring, the bit condition should be checked regularly. Replacement should be considered when the following situations occur: the wear height of the cemented carbide buttons exceeds two-thirds of the original height; the bit head is severely worn, and the "Easy-Return-To-Plane" effect can no longer maintain an effective working surface; there is large-scale button loss, head cracking, or severe thread damage; or after ruling out other factors like equipment issues, a significant and sustained drop in penetration rate is observed.
In summary, the rock drilling tool system is the cornerstone of modern rock engineering. As an outstanding representative, the Threaded Drill Bit 127-GT60 "Easy-Return-To-Plane" is not merely an efficient tool but a crystallization of the continuous evolution of top hammer drilling and rock drilling technology towards the goals of being "more efficient, more durable, and more economical." It combines material science, precision manufacturing, and in-depth rock fragmentation theory, solving key practical application challenges with its innovative "Easy-Return-To-Plane" design. For project managers, investing in and correctly applying such advanced top hammer tools is a strategic decision that can directly enhance construction efficiency, ensure operational safety, and ultimately optimize the project's overall economic benefits. Only by deeply understanding its technical essence and strictly adhering to the norms of selection, matching, use, and maintenance can the full potential of these rock hammer drill components—these "industrial teeth"—be unleashed. This enables the achievement of safe, efficient, and economical project execution in the face of various severe rock challenges. As integral members of the broader category of rock drilling tools, their performance is critical to success.
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