A Study on the Numerical Simulation of Rock Breaking by PDC Wear Teeth Cutting

The existing literature on numerical simulation of cutters rarely considers the effect of wear height on cutter temperature and cutting load. However, the force and thermal wear of PDC cutters deteriorate after wear, leading to rapid failure. In order to discuss this problem, based on elastoplastic mechanics and rock mechanics, the Drucker-Prager criterion was used as the rock constitutive model to establish a three-dimensional dynamic rotational simulation model of the worn teeth. The numerical simulation method was used to analyze the stress state and temperature rise amplitude of the worn teeth under the conditions of different wear heights, cutting depths and front angles. The results show that, compared with unworn teeth, the cutting load of worn teeth increases with the increase of wear height, and the maximum is reached when the wear height of the cutting teeth (diameter 13.4 mm, total height 8 mm) is 1.5 mm. The more serious the wear of the cutting teeth, the greater the force required to enter the same depth; The cutting load will increase with the increase of the front Angle. Therefore, the higher the wear height and the higher the front Angle, the higher the failure risk of the cutter. With the increase of cutter wear height, the temperature rise of cutter significantly increases, which can be increased by 54%-103% under simulated conditions.