dth bit

Product Description

Flat Face Bit This kind of face shape is suitable for hard to very hard and abrasive rock formations in applications with high air pressures. Good penetration rates and resistance to steel wash. Double Gauge face This kind of face shape is suitable for fast penetration rates in medium to hard rock formations. Designed for high air pressures and good resistance to steel wash step gauge bit. Convex face For high penetration rates in soft to medium-hard with low to medium air pressures. It is the most resistance to steel wash, and may reduce the load and wear on the gauge s, but poor hole deviation control. Concave face The all-round application bit face specifically for medium hard and homogeneous rock formations. Good hole deviation control and good flushing capacity. Drop Center Bit For high penetration rates in soft to medium-hard and fissured rock formations. Low to medium air pressures. Maximum hole deviation control. 平面型: 这种平面型头部适应于高风压时钻凿很坚硬岩层以及磨蚀性强的岩层。此时，钻速较快，钻体磨蚀较少。 双边齿型: 这种双边齿型头部适应于高风压时钻凿很坚硬的岩层。此时钻速快，钻头体磨损不严重。 凸面型: 这种形状适应于低—中风压时钻凿软—中硬岩层，钻头钢体不易磨蚀。其特点是边齿承载较低，磨损不严重，钻岩速度快，但炮孔偏差难以控制。 凹面型: 这种头部形状适用于所有岩层，特别是在中硬和岩性均匀的岩层中使用效果最好。炮孔偏离度小，排渣效果好。 中心下陷型: 采用低—中风压钻凿软—中硬以及有裂缝的岩层时，为了获得很快的凿岩速度和较少炮孔偏斜率， 通常采用这种头部形状。