Numerical investigation on dynamic characteristics of drilling shaft in deep hole drilling influenced by minimal quantity lubrication
Numerical investigation on dynamic characteristics of drilling shaft in deep hole drilling influenced by minimal quantity lubrication
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DOI：
10.1007/s11071-013-1014-5
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发表时间：
2013-08
影响因子：
5.6
通讯作者：
L. Kong;Yan Li;Yanjun Lv;Qinfeng Wang
中科院分区：
文献类型：
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作者：
L. Kong;Yan Li;Yanjun Lv;Qinfeng Wang
研究了微量润滑对深孔钻削过程中钻轴动力学特性的影响。根据油气特性下可压缩流体雷诺方程的特点，建立了MQL深孔钻削中切削液压力分布的非线性时变数学模型。通过引入微分变换法，用直接积分法求解切削液中的时变压力方程。得到了转速、横向位移比和径向间隙对切削液动水压力分布的影响规律。这种方法的优点是克服了大部分的计算量，并具有快速的收敛速度。分析了MQL对钻轴非线性响应的影响，讨论了钻轴系统设计参数变化时钻具转速的失稳情况。
The dynamic characteristics of drilling shaft in deep hole drilling influenced by minimal quantity lubrication (MQL) is investigated. According to the features of the compressible fluid Reynolds equation in oil/air feature, a time-dependent mathematical model is established to describe the pressure distribution of cutting fluid with nonlinearity in MQL deep hole drilling. By introducing the differential transformation approach, the time-dependent pressure equation arising from cutting fluid is solved by the use of direct integral method. The influences of the rotational speed, the transverse displacement ratio, and radial clearance on the hydrodynamic pressure distribution of cutting fluid are obtained. The advantage of this method is to overcome much of the computational cost and has its rapid convergence rate. Furthermore, the nonlinear responses of drilling shaft influenced by MQL are analyzed, and the instability rotational speeds of drilling tool are discussed while the design parameters of drilling shaft system changing.