基于静电微量润滑技术的磨削加工性能试验研究

在构建静电微量润滑(EMQL)磨削加工系统的基础上，分析了不同荷电电压下润滑液液滴的荷质比和润湿渗透性能，研究了正负荷电电压下静电微量润滑技术的磨削加工特性。通过分析工件表层的显微硬度和显微组织，揭示了静电微量润滑技术的磨削加工作用机理。结果表明：荷电液滴的表面张力与润湿角减小，液滴的渗透性和润湿性提高。与传统微量润滑（MQL）相比，荷电液滴更易在砂轮-工件接触面渗透铺展，提升了润滑与换热能力，在正荷电静电微量润滑条件下，工件表层显微组织中的铁素体相对含量增加，工件表层显微硬度降低，磨削加工性能更好。

Experimental Investigation on Grinding Performance Based on EMQL Technology

As an EMQL grinding system was developed, the effects of charging voltages on charge to mass ratio of lubricant droplets were investigated, and the wettability and permeability of droplets were analyzed. The grinding characteristics of EMQL were systematically studied at positive and negative charging voltages. Through analyzing the microhardness and microstructure of ground workpiece surfaces, the grinding mechanism of EMQL was revealed. The results show that as lubricant is charged, the surface tension and wetting angle of lubricant droplets reduce, and increase the permeability and wettability. Compared with the conventional MQL, the charged lubricant droplets are easily to enter and cover the wheel-workpiece interfaces, which improve the lubrication and the capacity of heat transfer on the grinding areas. Under the conditions of EMQL, the positive voltages increase the relative contents of ferrites on the ground surfaces, followed by reducing the microhardness of workpiece surfaces, which produce the better grinding performance.