阶梯式冲击挤密钻头结构优化设计及试验

The optimization design and experimental research on percussion-compact step drill bit

为了对阶梯式钻头的结构进行优化设计,提高冲击挤密钻进效率,采用Drucker-Prager屈服准则为判据,将土体视为DP材料,冲击钻具视为刚体,利用有限元软件ANSYS建立了冲击挤密钻进有限元模型,基于APDL参数化语言对阶梯钻头的台阶数目及钻头结构尺寸进行了优化设计和试验研究。结果表明,对于直径为60mm,钻头体长为150mm的阶梯钻头而言,台阶数目为9时,钻头钻进速度最快。在此基础上对九阶梯钻头的结构进行了优化设计,与普通结构阶梯钻头相比,优化钻头钻进速度提高了22%。与传统方法相比,利用ANSYS优化设计模块对钻头进行优化设计简单、可靠,为钻头结构的最优化设计提供了一种新思路和新手段。

In this paper, a model of percussion-compact drilling is set up with ANSYS Finite Element Analysis software. Based on the ANSYS Finite Element model, the number and structure parameters of the step bit are optimized and an experimental research is done. Compared with the conventional step bit, the drilling speed of the optimization step bit is increased by 22%. The ANSYS Finite Element model is simple and reliable to use, offering a new approach to the optimization of step bit.