Whirling vibration of drilling shaft in minimal quantity lubrication deep hole drilling using theoretical and experimental investigation
Whirling vibration of drilling shaft in minimal quantity lubrication deep hole drilling using theoretical and experimental investigation
复制标题
微量润滑深孔钻削钻轴旋动振动的理论与实验研究
DOI：
10.1177/0954406214559110
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Qingfeng Wang
中科院分区：
文献类型：
--
作者：
L. Kong;Han Niu;X. Hou;Qingfeng Wang
在深孔钻井安全、提高效率或降低成本的概念下，分析了最小量润滑（MQL）对钻井轴动态特性的影响。建立了MQL切削液在钻井过程中的压力函数模型。该模型基于非线性气/油特征的可压缩雷诺方程，引入微分变换理论求解MQL切削液满足的时变压力方程。此外，以模型开发为重点，通过实验验证了上述方法的正确性和有效性。对不同转速和钻孔深度下钻孔轴的旋转特性进行了一系列实验研究。此外，在MQL钻井和传统钻井两种不同的实验条件下，检测了钻井轴的振动轨迹和孔表面粗糙度。结果表明：在MQL深孔钻孔过程中，钻孔轴的旋转轨迹明显减小，但加工孔的表面粗糙度因表面划痕或结垢而变差；但为了提高孔面的加工精度，存在一个最佳的钻轴转速。这些结果表明，与传统钻井相比，MQL方法具有更高的生产潜力，本文提出的方法可以为MQL钻井中钻井轴的动态稳定性研究奠定基础。
Under the concept of safety, improving efficiency, or reducing costs in deep hole drilling, the effect of minimal quantity lubrication (MQL) on the dynamic characteristics of drilling shaft is analyzed. A model is presented to describe the pressure function of MQL cutting fluid during drilling process. This model is based on the compressible Reynolds equation in air/oil feature with nonlinearity, and the differential transformation theory is introduced to solve the time-dependent pressure equation satisfied with MQL cutting fluid. Further, with an emphasis on model development, experiments are performed to validate the correctness and effectiveness of the above methods. A series of experimental investigations are carried out on the whirling characteristics of drilling shaft when the rotational speed and drilling depth are changed. Additionally, the vibration trajectories of drilling shaft and the surface roughness of hole are detected under different experimental conditions such as MQL drilling or traditional drilling. The results show that the whirling trajectory of drilling shaft decreases significantly in MQL deep hole drilling but the surface roughness of machined hole is worse due to surface scratches or scales. Nevertheless, there exists an optimal rotational speed of drilling shaft to improve machining precision of hole surface. These results indicate that the MQL method has shown potential to be even more productive as compared to traditional drilling and that the proposed method in this paper can lay a foundation for investigating the dynamic stability of drilling shaft in MQL drilling.