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建立了聚晶金刚石(PDC)钻头切削齿切削岩石过程的有限元模型,模拟了不同形状切削齿不同切削深度下的线性和圆弧切削过程。模拟前确定了切削齿的空间形态、切削速度、切削深度、材料的流变模型、摩擦模型等。模拟结果表明:线性和圆弧切削过程没有本质区别;各类切削齿的切削力波动均为振荡和不均匀的,不存在周期性;采用同一切削齿时不同切削深度下的切削力波动没有类似规律,但切削深度增加会引起波动幅度增大;切削深度为0.5 mm和1.0 mm时,切削参数保持稳定后平均切削力减小,而切削深度为2.0 mm时,进入稳定切削区后平均切削力并未减小;使用球形齿和圆锥形齿时切削力较小,而使用锥形齿、斜角形齿和平板形齿时切削力较大;采用平板形齿时切削力波动图上单位时间内峰数最少,采用球形齿时最多。
The finite element model of cutting rock of polycrystalline diamond (PDC) bit cutting teeth was established, and the linear and circular cutting processes under different cutting depths of different shape cutting teeth were simulated. The space shape, cutting speed, depth of cut, rheological model of material, friction model and so on were determined before simulation. The simulation results show that there is no essential difference between the linear and the circular arc cutting process. The cutting force fluctuations of all kinds of cutting teeth are oscillatory and non-uniform, and there is no periodicity. The cutting force fluctuations at different cutting depths when using the same cutting tooth are not similar But the increase of the cutting depth will cause the fluctuation to increase. When the cutting depth is 0.5 mm and 1.0 mm, the average cutting force decreases after the cutting parameters are stable. When the cutting depth is 2.0 mm, the average cutting force The cutting force is smaller when using the spherical tooth and the conical tooth, while the cutting force is larger when using the conical tooth, the bevel tooth and the flat-shaped tooth, and when the flat-shaped tooth is used, the cutting force fluctuates within the unit time Least number of peaks, the most when using spherical teeth.