深孔机床DF系统内部流场的数值模拟

Numerical Simulation of Flow Insidedeep-hole Machine Tool DF System

为提升深孔加工机床的排屑性能,对现有深孔机床DF系统进行了研究,结合湍流力学相关理论建立了DF系统的数学模型,并运用CFD软件Fluent,选取标准k-ε模型对DF系统内部流场进行了数值模拟;分析其速度场、压力场、能量场,发现过大的切削液压力并不能带来更好的负压效果,而且目前DF系统的抽屑器入油口分布、射流间隙形状、后喷嘴尺寸仍会造成过大的能量损失,不利于卷吸性能的发挥。这些为提高DF系统的负压效果提供参考依据,也可对深孔机床DF系统结构参数的优化设计提供理论指导。

To improve the performance of chip removing of deep-hole machine tool, aimed at the existing-deep-hole machine tool DF system, mathematical modelwas established by the theory of turbulence mechan-ics andthe flow inside was simulated with applyingthe standard k-εmodel by CFD software Fluent. Through analyzing velocity field, pressure field and energy field, the result shows that excessive cutting fluid pressure isn’ t equal to better negative pressure effect, and DF system structures, such as the distribution of dust ex-tractor oil mouth, jet clearance shape and the size of the back nozzle,cause too large energy loss to exerten-trainment performance. The above conclusions provide references for improving the negative pressure effect of DF system and theoretical basis for the optimization of the deep-hole machine tool DF system structural parameters.