Abstract：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.
2014, Vol. 35 
