切削齿型结构对金刚石钻头钻进性能影响的仿真分析

Simulation Analysis on the Influence of Cutting Teeth Structure on Drilling Efficiency of Impregnated Diamond bit

摘要:

基于有限元分析软件ANSYS/LS-DYNA，建立了孕镶金刚石钻头的三维有限元模型，研究了钻头切削齿结构对钻进性能的影响并进行现场试验验证，提出了一种基于Image-Pro Plus的应力面积分布对比方式。结果表明：同心环齿型钻头在钻进初期沿旋转方向切削齿前缘出现应力集中现象，花齿型钻头未出现明显的应力集中；2种齿型钻头在钻进后期均会不同程度出现内外径边缘靠近水口部位应力集中现象，易导致钻头内外径部位变相磨损；花齿型钻头的钻进效率要优于同心环型钻头，但是钻进寿命有所下降。

Abstract:

Three-dimensional finite element model of impregnated diamond bit was established based on finite element analysis software ANSYS/LS-DYNA and the influence of cutting teeth structure on drilling efficiency was analyzed with the field test verification carrying out; a new method for stress area comparison based on Image-Pro Plus was present. The results show that stress concentration appears for concentric ring cutting teeth structure at the front edge of cutting teeth along the rotation direction in initial drilling stage, while non obvious stress concentration appears for saw teeth bit. But different degrees of stress concentration appear at inner and outer diameter edges near the nozzle part for these two kinds of bits in late drilling stage, which may lead to abnormal wear. The saw cutting teeth bits are more efficient than concentric ring ones, but the bit service life is slightly lower.