挠性抗回旋PDC钻头的有限元分析

Finite Element Analysis of Flexible Anti-Whirl PDC Bit

回旋是导致PDC钻头早期失效的主要原因,介绍了一种基于挠性钻头的构想设计的抗回旋PDC钻头,阐述了其结构和抗回旋原理。对挠性钻头的公、母接头进行了有限元应力分析,说明了模型建立、网格划分以及约束和载荷施加过程中所采用的方法和关键技术。有限元分析结果表明挠性钻头的强度满足要求。

Bit whirl is a major cause of PDC bit early failure. A kind of anti-whirl PDC bit designed based on the idea of flexible bit is introduced in this paper and the structure and working principle of it is expatiated. Male joint and female joint are main parts of the flexible bit, finite element stress analysis of which is done. The methods and key technologies of modeling, meshing and restriction imposing and loading are described. The results of finite element analysis show that the strength of flexible joint is enough.