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Research on cobalt-rich-crust cutting mechanism of conical picks under different types of joints conditions

Abstract In order to study the cobalt-rich-crust cutting mechanism of conical picks under conditions of different types of joints, a simulation model of cobalt-rich-crust cutting is establish based on the discrete element method. The cutting pattern, cutting efficiency, crack growth ability, and size of broken cobalt-rich crust are analyzed and similar cutting experiments are conducted. The results thus obtained show that the cutting pattern is directly affected by the joint of the cobalt-rich crust and bedrock and the cutting space and load modes, and there are six basic cutting patterns under various working conditions. As the joint angle is increased, the cutting efficiency of the conical pick decreases gradually. The cutting efficiency of a simultaneous pattern is greater than that of a sequential pattern. When the cutting space is less than 35 mm, the size of the broken cobalt-rich crust produced using the simultaneous pattern is smaller than that produced using the sequential pattern. The cutting experiments verify the accuracy of the simulation.