Temperature analysis of cemented carbide drill cutting rock associated with water jet

The temperature equation of drill rake face was established upon the analysis of heat conversion and transfer during the rock cutting process which uses cemented carbide drill bit. Based on the thermodynamic analysis of heat transfer process between water jet and the blade surface, the differential equations of heat convection and differential equation of steady heat conduction between water jet and the blade surface were established. Expression of heat exchange power and expression of temperature field of the blade were derived. Study results show that without water jet, the temperature of the drill rake face in rock cutting is proportional to the square root of cutting speed v_q, and the existence of water jet can significantly reduce the temperature of cutting tool, the power expression of heat exchange Φ between water jet and the blade surface is proportional to the four square root of the jet pressure p, the average changing temperature of blade is proportional to p^-1/4. The experimental results under certain conditions show that the drill breakage declined sharply and the life of drill is improved effectively by cemented carbide drill cutting associated with water jet.