随着全球油气勘探开发不断向深井超深井发展，井下高温环境及现场作业时钻井工况参数选择不合理等问题使钻头磨损日益严重。为延长钻头寿命并提高破岩效率，建立聚晶金刚石复合片（polycrystalline diamond compact, PDC）单齿切削大理岩的三维仿真模型，分析不同切削深度、切削速度和齿倾角对PDC齿表面温度以及对破岩效率的影响规律。结果表明：在整个切削过程中切削齿温升分为上升期-过渡期-稳定期3个阶段，且随着切削深度增加到一定程度时岩石的破碎形式由塑性转变为脆性。切削速度的增加使温度与破碎比功均增加，切削深度与齿倾角的增加均会使破碎比功增加而温度出现先增大后减小的现象。并通过响应面法对切削速度、切削深度和齿倾角进行优化，给出最佳参数组合。研究成果可为现场PDC钻头高效破岩提供指导。

With the development of global oil and gas exploration and development to deep and ultra-deep wells, the problems such as underground high temperature environment and unreasonable selection of drilling parameters in field operation make the bit wear increasingly serious. In order to prolong the bit life and improve the rock breaking efficiency, a 3D simulation model of polycrystalline diamond compact(PDC) cutters marble was established, and the effects of different cutting depth, cutting speed and bit caster on the PDC cutters surface temperature and rock breaking efficiency were analyzed. The results show that the temperature rise of the cutting gear can be divided into three stages: ascending period, transitional period and stable period, and the crushing form of the rock changes from plastic to brittle when the cutting depth increases to a certain extent. With the increase of cutting speed, both temperature and crushing work ratio increase. With the increase of cutting depth and bit caster, the crushing work ratio increases and the temperature increases first and then decreases. The response surface method was used to optimize the cutting speed, cutting depth and bit caster, and the optimal parameter combination was given. The research results can provide guidance for efficient rock breaking of PDC bit in field.