Abstract
The cutter is the main cutting element for breaking rock, and the interaction laws between the cutter with different surface shapes (abbreviated as cutter shapes) and rocks are different. The rock breaking mechanism of PDC circular cutter, elliptical cutter and ridge cutter on different rocks is studied by experiment and simulation, which the results show that the ridge cutter has the strongest penetration ability, followed by elliptical cutter, and the PDC circular cutter have the weakest when scraping rocks with different temperatures. Compared with circular cutter scraping granite, the crushing specific work of elliptical cutter and ridge cutter is reduced by 9%–11% and 18%–28% respectively. When scraping sandstone, the crushing specific work decreases by 9%–18% and 14%–24% respectively, and the ridge cutter have the largest debris and particle size. The 3D cutters such as ridge cutter have the largest damage value to the rock, which is easier to reduce the rock strength, and the rock breaking efficiency is higher. Compared with the circular PDC cutter, the maximum cutter edge Cpress stress of Benz cutter, ridge cutter and elliptical cutter decreased by 52.9%, 52.4% and 16.8% respectively, the stress fluctuation in Benz and ridge cutter is smaller than that in circular cutter, which is conducive to prolonging the cutter working life. The 3D cutter, such as ridge and Benz cutter are conducive to prolonging the working life when drilling high hardness, strong abrasiveness and high temperature formations.
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