Abstract: A tri-dimensional finite element numerical simulation model for cutting heterogeneous granites with specially-shaped cutter and full-sized bits was established based on the indoor cutting experiments. The values of tangential force， normal force， rock debris and MSE in the cutting processes of heterogeneous rocks with 12 kinds of PDC cutters were discussed， and the influences of cutter shape on rock-breaking efficiency of full-sized bits were also studied. The research results show that the tangential force of the conical cutter is the smallest， the MSE is the highest， and the footage of the corresponding conical cutter bits is also the smallest. Among all the cutters， the normal force and tangential force of the tri-planar cutters are the largest， while the MSE hyperboloid-shaped cutters is the smallest. Bits with saddle-shaped cutter， hyperboloid-shaped cutter or axe-shaped cutter which are easier to penetrate into rocks are able to have larger footage. 

Key words: granite, polycrystalline diamond compact（PDC） cutter, drill bit, cutting force, mechanical specific energy（MSE）

摘要： 在室内切削实验基础上基于有限元二次开发建立了异形齿切削及全钻头破碎非均质花岗岩的三维数值仿真模型，研究了12种形状聚晶金刚石复合片（PDC）齿切削非均质岩石过程中的切向力、法向力、岩屑、破岩比功，并研究了齿形对全尺寸钻头破岩效率的影响。研究结果表明：锥形齿的切向力最小，破岩比功最高，对应的锥形齿钻头的进尺也最小；三平面齿的法向力和切向力均为最大；破岩比功最低的齿为双曲面齿；进尺最大的全钻头齿形为更易吃入岩石的鞍形齿、双曲面齿以及斧形齿。

关键词: 花岗岩, PDC齿, 全钻头, 切削力, 破岩比功