新型PDC钻头切削齿破岩仿真实验研究

doi:10. 11799/ ce202504030

摘要/Abstract

摘要：

为探究PDC钻头切削岩层仿真过程中不同工作参数对破岩率的影响，基于EDEM软件建立了新型PDC钻头的单个切削齿的离散元仿真，模拟了单个切削齿切削岩壁的动态过程，分析了切削齿分别在不同自身角度、切入岩壁夹角、钻头转速、牵引速度等关键因素下的破岩状况，通过粘结键的破坏数量得到各因素下的破岩率。结果表明：切削齿自身角度和牵引速度是影响破岩率的主要因素，切入岩壁夹角和钻头转速是影响破岩率的次要因素。当切削齿自身角度为70°、切入岩壁夹角为30°、钻头转速为31.4rad/s、牵引速度为0.25m/s时破岩率最高。在相同条件下, 圆柱形切削齿破岩率为57.66%, 圆台形切削齿破岩率为56.36%，但圆台形切削齿的磨损量比圆柱形切削齿降低29.72%，有效地提高了刀具的使用寿命，具有更好的破岩性能。研究结果可为EDEM模拟切削齿破岩过程中PDC钻头切削齿的设计及施工参数的选择提供参考依据。

关键词:

PDC钻头 , EDEM , 单齿切削 , 破岩过程 , 破岩率

Abstract:

PDC (polycrystalline diamond composite) drill bit is one of the most widely used tools in mechanical rock breaking. In order to investigate the influence of different working parameters on the rock breaking rate in the simulation process of PDC drill bit cutting rock formation, a discrete element simulation of a single cutting tooth of a new type of PDC drill bit was established based on the EDEM (Discrete Element Method, DEM) software, which simulated the dynamic process of a single cutting tooth cutting rock wall, and analysed the rock breaking condition of the cutting tooth at different angles of itself, the angle of cutting into the wall, the rotation speed of the drill bit, the traction speed, and other key factors, and the rock breaking rate of the factors was obtained by the number of the destruction of the bonding bonds. The results showed that: The angle of the cutting tooth and the traction speed are the main factors affecting the rock breaking rate, the angle of cutting into the rock wall and the rotation speed of the drill bit are the secondary factors affecting the rock breaking rate. The highest rock breaking rate was achieved when the angle of the cutting teeth was 70°, the angle of cutting into the rock wall was 30°, the rotation speed of the drill bit was 31.4 rad/s, and the traction speed was 0.25 m/s. Under the same conditions, the rock breaking rate of cylindrical cutting teeth is 57.66%, and the rock breaking rate of circular platform cutting teeth is 56.36%, but the wear of circular platform cutting teeth is 29.72% lower than that of cylindrical cutting teeth, which effectively improves the service life of the tool, and has better rock-breaking performance. These findings can serve as a foundation for designing and selecting construction parameters of PDC drill bit when simulating the working process of cutting teeth for rock breaking by EDEM.

中图分类号:

TD421

罗晨旭, 高君毫, 曾嘉玮, 等.

新型PDC钻头切削齿破岩仿真实验研究 [J]. 煤炭工程, 2025, 57(4): 218-224.

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