(1) Cold work hardening of metal after cold extrusion, and the formation of reasonable fiber streamline distribution inside the drill bit  

the strength of the drill is much higher than that of the raw material  

(3) Reasonable cold extrusion technology can make the surface of the bit form compressive stress and improve the wear resistance 

Wide range of use  

Practice has proved that the drill bit is suitable for drilling hard strata such as carbonate rock, limestone, chalk rock, clay rock, siltstone, sandstone and so on. Compared with the general drill bit, especially drilling rock strata of grade 6 ~ 8, the drill bit has a remarkable effect.