zhongyun high quality self drilling

At present, there are four main design forms of the end face of the high-pressure subsurface drilling bit: the convex end face type, the plane end face type, the concave end face type and the deep concave central end face type.Carbides can be used for multiple selection of ball teeth, spring teeth or the tooth distribution mode Shared by ball teeth and spring teeth.

1. Convex type of end face: this kind of drill can be divided into two forms, single convex head and double convex head end face, the latter is mainly used for drill with larger diameter subsurface holes.In the process of drilling hard and hard abrasive rock, the subsurface drill bit with convex face can maintain a high drilling rate, but the straightness of the borehole is poor, which is not suitable for the drilling engineering with high straightness requirement of the gun hole.

2, end plane type: this type of drill bit is relatively durable, suitable for drilling hard and extremely hard rock, but also suitable for drilling hole straightness requirements is not high medium hard rock and soft rock.

3, end face plane type: this shape of bit end face has a conical concave part, is the bit in the drilling process of slightly nucleation to maintain the performance of the drill bit in the middle, drilling hole has a good straightness, the drill powder discharge effect is good, drilling speed is fast, is currently in the market more use of drill bit subsurface hole.

4, end face deep concave center type: this shape of the bit is the same type of ball tooth bit evolved from the center of the end face of a deep concave center part.Used for the nucleation in the process of rock drilling, to ensure the straightness of gun hole when drilling deep hole, only suitable for drilling soft rock and medium hard rock.