Summary

Rock cutting mechanics has been studied in order to better understand drilling process at the cutter scale. The cutting energy is mainly dependent on cutter orientation and rock properties. Although there have been some analytical solution for the 2D cutting process, the siderake effects are not taken into account. This paper proposes an analytical solution for the rock cutting with sharp cutters, considering both backrake and siderake. To validate the model solution, homemade equipment was developed. Based on the cutting action of clays, the experiment was run with no backrake and siderakes varying between 30° and 60°. The results agree with the solution proposed for the model. Focusing on a parametric study for two hypothetical rocks, the model has shown that high backrake and/or siderake angles increase the specific energy. The backrake effect is strongly dependent on the rock internal friction angle.

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