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Common tooth shapes of tricone bits

Common tooth shapes of tricone bits

Classification:
Drilling Fields
2019/03/25 14:49
[Abstract]:
The basic requirement for teeth is high rock breaking efficiency and long life.
The basic requirement for teeth is high rock breaking efficiency and long life. In order to meet this requirement, the geometry of the tooth should be reasonable, and the material of the tooth should be wear-resistant and strong enough.
At present, there are milling teeth (also called steel teeth) and cemented carbide teeth (abbreviated as insert teeth).
 
  • Milling tooth profile
In order to improve the wear resistance of the teeth, the cemented carbide powder is applied on the tooth surface in order to improve the wear resistance of the teeth in order to improve the wear resistance of the teeth in order to improve the wear resistance of the teeth.
The profile of milling teeth is mainly wedge-shaped teeth. External diameter-preserving teeth can be made into type, T, L-shape.
 
  • Tooth profile

Wedge-shaped tooth: It is suitable for breaking soft ground with high plasticity and medium hard stratum. The sharp corner of the tooth is from 65 to 90, and the sharp corner of the tooth is suitable for soft formation, and the sharp corner of the tooth is suitable for hard strata.

 

Spoon-shaped teeth: there is also a wedge-shaped tooth that is asymmetric on both sides, one of which is concave, referred to as a Scoop Chisel, that is suitable for drilling soft formations.

 

Conic teeth: single-cone and double-cone, crushed rock in a crushing manner, and 60-70% medium-diameter conical teeth are used to drill medium-hard strata, such as limestone, dolostone.90-cone and 120-cone-shaped teeth are suitable for hard strata with high grinding property, such as hard sandstone and quartzite.

 

Trigonal tooth: a plane cut every 120 times on the cone of a double bevel tooth, suitable for the crisscross of hard and brittle formations and the interlaced layers of soft and plastic formations.

 

Spherical teeth: high strength and wear resistance, crushing high abrasive hard strata such as chert, quartzite, basalt, granite by crushing and impact.

 

Ejector tooth: it is the deformation of spherical teeth, the teeth are high but have a certain strength, suitable for high abrasive hard strata.

 

flat-topped tooth: a cylindrical cylinder with a chamfer at the end and used only on the back cone of the wheel to prevent wear and tear of the back cone of the tooth wheel, thereby maintaining the size of the gauge.

 

Wedge tooth: basically wedge-shaped, but the edge of the tooth is narrow at one end and wide at one end. Used on the outer teeth of a medium hard to soft formation bit. The wide side has large wear resistance and is installed on the outer edge of the bit to prevent the drill from being worn small by cutting the shaft wall.