Influence of Tooth Shape on Impact Drilling Performance of DTH Drill Bits

Table of Contents

In rock drilling engineering, down-the-hole drill bits are commonplace tools and find widespread use in open-pit coal mines, ore mining, anchoring engineering, and various other fields. Its impact on drilling performance is affected by many factors, among which the tooth profile is one of the most crucial factors. This article will discuss in detail the impact of the drill tooth profile on the impact drilling performance of down-the-hole drill bits and analyze how to optimize the drill tooth profile to improve impact rock drilling performance.

DTH drill bits

Influence of tooth profile on impact drilling performance of down-the-hole drill bit

The impact drilling performance of a down-the-hole drill bit refers to its efficiency and effect in drilling into rock, including the depth and diameter of the drill hole, the smoothness of the hole wall, and the verticality of the drill hole. The tooth profile of drill teeth is one of the significant factors affecting the impact of the drilling performance of down-the-hole drill bits. Different drill tooth shapes will have various effects on the impact drilling process, thereby affecting the drilling effect of the drill bit.

Drill tooth shape

The shape of drill teeth is one of the key factors affecting its impact on drilling performance. Drill teeth of different shapes will produce various stress distributions and fracture modes during the rock drilling. For example, spherical buttons are mainly used as gauge buttons of down-the-hole drill bits and are suitable for moderately abrasive, relatively hard rock. Parabolic buttons are primarily employed as gauge buttons and front gauges in down-the-hole drill bits, suitable for medium-abrasive and relatively hard rocks. Conical buttons, on the other hand, are mainly used as front gauges in down-the-hole drill bits, and they are well-suited for rocks with moderate abrasiveness and medium hardness. They can also be used as gauge buttons when the rock is relatively soft. The ogive buttons are mainly used as the front gauges of down-the-hole drill bits and are suitable for soft rock formations with high drilling speed and low tooth breakage rates. Flat-head buttons are mainly used as side protection teeth for down-the-hole drill bits to reduce wear on the surface of the drill bit body.

Drill tooth size

The size of the drill teeth also affects the impact of the drilling performance of the down-the-hole drill bit. Relatively large drill teeth can provide greater impact force and help improve rock drilling efficiency. However, oversized drill teeth may increase the contact area between the drill bit and the rock, increase frictional resistance, and reduce rock drilling efficiency. Therefore, choosing the appropriate drill tooth size is the key to improving the impact drilling performance of down-the-hole drill bits.

Drill tooth arrangement

In addition to the shape and size of drill teeth, the arrangement of drill teeth is also an essential factor affecting the impact of the drilling performance of down-the-hole drill bits. A reasonable arrangement of drill teeth can enable the down-the-hole drill bit to produce uniform impact force and crushing mode during the rock drilling process, thereby improving rock drilling efficiency. Unreasonable drill tooth arrangement may lead to local stress concentration or uneven impact force, reducing rock drilling efficiency.

In addition, the wear resistance and strength of drill teeth are also important factors affecting the performance of impact drilling. Drill teeth with good wear resistance can reduce wear and extend service life; drill teeth with high strength can withstand greater impact force and improve drilling efficiency.

Optimize drill tooth profile to improve impact drilling performance

Improve the impact drilling performance of down-the-hole drill bits can be done in the following aspects:

  • Optimize drill tooth shape: choose the appropriate drill tooth shape according to different rock types and hardness to better cut into the rock and achieve more effective rock crushing.
  • Reasonably adjust the drill tooth size: According to the actual application requirements and rock properties, select the appropriate drill tooth size to obtain the best impact force and rock drilling efficiency.
  • Optimize the arrangement of drill teeth: by reasonably arranging the arrangement of drill teeth, the down-the-hole drill bit can produce uniform impact force and crushing mode during the rock drilling process.
  • Introduce new materials and processes: high-strength, wear-resistant, and impact-resistant materials are used to manufacture drill teeth. At the same time, advanced manufacturing processes are introduced to improve the DTH bits’ overall performance and service life.
  • Monitoring and maintenance: during use, the down-the-hole drill bit is monitored and maintained in real-time, repairing the damaged drill teeth in time to ensure its good working condition and impact drilling efficiency.

Conclusion

In conclusion, the tooth profile of drill teeth significantly affects the impact of the drilling performance of down-the-hole drill bits. To enhance this performance, optimization, and control of the tooth profile are essential. Through various methods, we can effectively improve the impact drilling capabilities of down-the-hole drill bits, thereby enhancing the efficiency and safety of rock drilling operations. In practical applications, it is crucial to comprehensively consider various factors, select the appropriate down-the-hole drill bit, and optimize usage conditions to achieve the best rock drilling effect.

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