凝胶因子牵引分散纳米流体的摩擦及铣削加工性能  

Tribological and Milling Performance of Nanofluid Dispersed by Dragging Effect of Gelator

作　　者：潘凯航 丁卓立 夏雨 林新建 张浩杰 张若冲 张世强 许雪峰[1] PAN Kaihang;DING Zhuoli;XIA Yu;LIN Xinjian;ZHANG Haojie;ZHANG Ruochong;ZHANG Shiqiang;XU Xuefeng(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou Zhejiang 310023,China;Hangzhou SFR Technology Co.,Ltd.,Hangzhou Zhejiang 311121,China)

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310023 [2]浙江杭州持正科技股份有限公司,浙江杭州311121

出　　处：《润滑与密封》2024年第11期74-81,共8页Lubrication Engineering

基　　金：国家自然科学基金项目(52105216,52275468)。

摘　　要：氧化石墨烯纳米流体具有良好的导电性能,可显著改善静电微量润滑工况下油基切削液的荷电能力,提高荷电润滑液滴在加工区域的润湿、渗透和沉积性能,改善气雾润滑冷却能力。为提高氧化石墨烯纳米流体的分散性能,提出引入凝胶因子牵引分散油酸修饰氧化石墨烯(GO/OA)基纳米流体的新方法,分析凝胶因子质量分数对纳米流体分散性能的影响规律,研究GO/OA纳米流体荷电性能随荷电电压的变化规律,通过四球摩擦试验及铣削加工试验,探讨凝胶因子牵引分散纳米流体的铣削加工性能。结果表明:通过凝胶因子对GO/OA的牵引分散作用,可使得所制备纳米流体可静置稳定分散长达12个月;随荷电电压增加,GO/OA纳米流体的荷质比显著升高,表现出良好的荷电性能;与传统微量润滑相比,纳米流体在荷电电压为-4 kV下表现出最优的润滑效果;在静电微量润滑铣削工况下,含有质量分数0.06%GO/OA的纳米流体润滑时切削力、工件表面粗糙度和刀具磨损均最小,铣削加工性能更好。The excellent conductivity of graphene oxide can significantly improve the charging capacity of oil-based cutting fluids under the condition of electrostatic minimum quantity lubrication.This can improve the wetting,permeability and deposition properties of charged lubricating droplets in the processing area,and improve the lubrication and cooling capacity of oil-based cutting fluids.In order to improve the dispersion performance of graphene oxide nanofluids,a new method was proposed by introducing low molecular weight organic gelator to realize the dragging dispersion of oleic acid modified graphene oxide(GO/OA)based nanofluids.The influence of gelator mass fraction on the dispersion performance of nanofluids was analyzed,the effects of charging voltage on the charging performance of GO/OA nanofluids were investigated,and the milling performance of dispersed nanofluids was investigated by four-ball friction test and milling test.The results show that through the dragging dispersion of gelator,the prepared nanofluids can be stably dispersed for 12 months.With the increase of charging voltages,the charge-to-mass ratio(CMR)of nanofluids increases significantly,showing good charging performance.Compared with traditional minimum quantity lubrication,nanofluids show the best lubrication effect at the charging voltage of-4 kV.Under the condition of electrostatic minimum quantity lubrication milling,the nanofluid containing mass fraction 0.06%of GO/OA shows a better milling performance,which has the lowest cutting force,workpiece surface roughness and tool wear.

关 键 词：纳米流体 牵引分散 荷电性能 静电微量润滑 铣削加工 

分 类 号：TH117.1[机械工程—机械设计及理论]