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Now high air pressure DTH Drill, the end surface of the design form mainly four: face convexity, planar end type, end concave type and end deep concave center type. Hard alloy used in the selection of the ball, the ball or the ball teeth and the teeth of the tooth. 1, end convexity: this bit divided into two forms, single lug boss and a biconvex platform end, which is mainly used for the large diameter DTH Drill. Face convexity DTH Drill in the drilling chisel hard and hard abrasive rock can maintain a high drilling rate, but poor flatness of the borehole, does not apply to hole flatness requirements higher drilling engineering. 2, end face plane: the shape of the drill is relatively strong and durable, suitable for drilling hard and very hard rock, but also the application of the drilling hole straightness requires not high in the hard rock and soft rock. 3, there is a conical end concave surface: concave part shape of the end surfaces of the drill bit...