The “artifact” used to grind rocks when mining and tunneling, carbide spherical drill bit

Carbide drill bit is a kind of equipment used in drilling engineering. It breaks rocks by the impact load generated by the drilling pressure and its own rotation. During rock drilling, the drill bit is subjected to high-frequency impact loads and is subjected to various composite stresses such as torsion, bending, tension, and compression. It is subjected to work such as rocks, rock powder, and mineral water in a high-speed rotation and collision environment. Wear and corrosion of media.

The roller cone bit is a drilling tool commonly used in oil and gas drilling. It consists of a drill bit body and many cones. It has the characteristics of a simple structure and high working efficiency, so it is widely used in various drilling operations. When the roller cone bit is working, the cutting teeth alternately contact the bottom of the well. The rock-breaking torque is small, the contact area between the cutting teeth and the bottom of the well is small, the specific pressure is high, and it is easy to eat into the formation. The total length of the working blade is large, so it can reduce wear to a certain extent.

Most of the roller cone drill bits used at home and abroad are tri-cone drill bits. The characteristics of this drill bit are: the distribution range of axial pressure and impact load is large and uniform, and it can fully utilize the effective space and drill smoothly. Carbide ball teeth are one of the important components of the roller cone drill bit. It is located on the tooth edge of the drill bit and is responsible for cutting rock and breaking up the formation. Carbide ball teeth are based on the powder of one or several refractory metal carbides (such as tungsten carbide, titanium carbide, tantalum carbide, niobium carbide, etc.), with cobalt, nickel and other metal powders as binders, using powder metallurgy An alloy material produced by a process with excellent thermodynamic and chemical properties.

In drilling operations, carbide ball teeth bear huge impact and friction, so they need to have high hardness, impact resistance and wear resistance to maintain a long working life. At the same time, carbide ball teeth also need to have a certain degree of toughness to resist the strong impact of rocks and the risk of fracture. Such design and material requirements make carbide ball teeth a key component with excellent performance, which can stably carry out drilling operations under complex geological conditions.

The size and shape of the carbide teeth used in roller cone drill bits must be suitable for the characteristics of the rock, requiring good wear resistance, high strength, and resistance to chipping and breaking. The carbide teeth used in roller cone drill bits mainly include spherical teeth, conical spherical teeth, wedge-shaped teeth, side wedge teeth and flat-top teeth for wheel backs and claw tips.

Generally, roller cone bits for drilling into extremely hard rock formations mainly use spherical teeth, the bit pressure is 892~1339MPa, and the rotation speed is 50~80r/min; roller cone drill bits for drilling into hard and medium-hard rock formations use cone spherical teeth, and the drilling force is 892~1339MPa. The pressure is 714~1071MPa, and the rotation speed is 60~100r/min; the roller cone bit used to drill soft and medium-soft rock formations uses wedge teeth or side wedge teeth, the drilling pressure is 535~803MPa, and the rotation speed is 80~120r/min.

The continuous innovation and improvement of cemented carbide ball teeth in drilling technology is of great significance for improving drilling efficiency and reducing costs. The continuously optimized carbide ball teeth can better adapt to different geological conditions and rock formation characteristics, increase drilling speed and penetration rate and reduce the occurrence of bit sticking and drilling accidents.

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