Numerical Simulation on Rock-breaking and Temperature Characteristics of Sawtooth PDC Cutter
Most of the researches on bionic teeth focus on the wave tooth shape,and there are few reports on the rock-breaking properties of sawtooth cutters.Based on plasto elasticity and Drucker-Prager rock failure criteria,a finite element model of interaction between sawtooth PDC cutter and granite was built to determine the rock-break-ing and temperature characteristics of the sawtooth PDC cutter.The results show that compared with ordinary PDC cutter,the sawtooth PDC cutter generates smaller peak and average cutting forces during the rock-breaking process,the average cutting force is decreased by about 12.7%,and the mechanical specific energy is decreased by about 19%.When the back rake angle increases,the mechanical specific energy and cutting force of the sawtooth cutter decrease and then increase.When the optimal back rake angle is 10°,the mechanical specific energy and cutting force of the sawtooth cutter are the smallest.When the cutting depth increases,there is a critical cutting depth of 1.5 mm.After exceeding 1.5 mm,the cutting force and mechanical specific energy show a jumping increase.Within the simulation range,the optimal design involves three sawteeth.The conclusions have guiding significance for the cutter layout and optimal design of bits.
sawtooth PDC cutterfinite element modelrock-breaking propertiesmechanical specific ener-gycutting forceback rake anglecutting depth
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