For high-pressure Down The Hole Drill Bit, there are four primary end face designs to choose from: convex, flat, concave, and end face with a deep concave center. Spherical, elastic, or a combination of spherical and elastic teeth are frequently used in cement carbide.
1. Face convex type: This Down The Hole Drill Bit comes in single-boss and double-boss end face varieties, with the latter being mostly utilized for large-diameter down-the-hole drilling. When drilling into medium-hard and hard abrasive rock, the convex end-face Down The Hole Drill Bit can sustain a fast drilling speed, but the hole's flatness is poor, making it unsuitable for projects requiring high blast flatness.
2. Down The Hole Drill Bit with a flat end face: This design is more robust and effective for drilling hard and extremely hard rocks. Additionally, it works well for drilling mild and medium-hard rocks that don't require extreme straightness.
3. End face concave type: This Down The Hole Drill Bit's end face features a conical depression. Some nucleation will take place throughout the rock drilling process to preserve the alignment performance of the Down The Hole Drill Bit. The Down The Hole Drill Bit's hole has a better straighter line. This sort of Down The Hole Drill Bit features a quick drilling speed and an excellent powder discharge effect. It is the DTH drill rig that is most often used nowadays.
