基于扭转振动的PDC钻头布齿角度对复合片磨损规律的影响研究

针对PDC钻头布齿角度对复合片磨损的研究现状与不足，本文提出了一种基于扭转振动的PDC钻头布齿角度对复合片磨损规律影响的研究方法。利用PDC钻头典型的几何学知识，分析PDC钻头布齿角度之间的关系以及对切削弧长、切削面积等的影响，建立PDC钻头的扭转振动模型，得到在振动下的位移、速度、转速等关键参数，然后利用磨损理论分析布齿角度对复合片磨损规律的影响。结果表明：前倾角的不同取值会引起PDC钻头复合片的磨损规律发生显著变化，而刃倾角对于PDC钻头体积磨损速度的影响非常复杂。作为布齿的重要参数，前倾角与刃倾角的取值会显著影响PDC钻头的性能，对其进行优化与合理取值，有利于提高PDC钻头复合片的使用寿命。本文的方法与结论对于进行PDC钻头复合片失效机理的研究具有参考意义。

Study of compact wear rule affected by tooth-distributing angle of PDC bit based on torsion vibration

Due to the research status and deficiencies of composite plate wear affected by tooth-distributing angle of PDC bit, this paper presents a research method of compact wear rule affected by tooth-distributing angle of PDC bit based on torsion vibration. Using the typical geometry knowledge of PDC bit, we analyze the relationship of tooth-distributing angles of PDC bit and the effect on the cutting arc length, cutting area, etc. And the torsion vibration model of PDC bit is established, thus obtaining the key parameters under the vibration condition, such as displacement, velocity, rotating speed, etc. Then we use wear theory to analyze the effect of tooth-distributing angle on compact wear law. The results show that: different values of backrake angle will cause the wear rule of PDC bit’s compact to change significantly, while cutting edge angle has a very complicated effect on volume wear rate of PDC bit. As the important parameters of tooth distribution, the values of backrake angle and cutting edge angle have seriously affected PDC bit’s performance. Therefore, to optimize and take reasonable values will help to improve service life of PDC bit’s compact. The method and conclusions of the paper have some reference significance to the study of failure mechanisms of PDC bit’s compact.