1. Convex end face type: This type of drill has two types, single boss and double boss end, the latter is mainly used for DTH hammer with a larger diameter. The convex-faced DTH hammer can maintain a high drilling rate when drilling medium-hard and hard abrasive rocks, but the flatness of the hole is poor, and it is not suitable for rock drilling projects that require high blast hole flatness.
2. End face plane type: The drill bit of this shape is more sturdy and durable, suitable for drilling hard and extremely hard rocks, and also suitable for drilling medium-hard and soft rocks where the straightness of the blasthole is not required.
3. Concave end face: This shape of the drill bit has a conical depression on the end surface, which forms a slight nucleation effect during the rock drilling process to maintain the centering performance of the drill bit, and the drilled blast hole has a good straight line This kind of drill has a good powder discharge effect and a fast drilling speed. It is the most used DTH hammer on the market.
4. Deep concave center type on the end face: the drill bit of this shape is evolved from the same type of button bit, and the center of the end face of the drill bit has a deep concave center part. It is used for nucleation in the process of rock drilling to ensure the straightness of the blast hole when drilling deep holes. It is only suitable for drilling soft rock and medium-hard rock.