Effects of Physicochemical Properties of Different Base Oils on Friction Coefficient and Surface Roughness in MQL Milling AISI 1045
Effects of Physicochemical Properties of Different Base Oils on Friction Coefficient and Surface Roughness in MQL Milling AISI 1045
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DOI：
10.1007/s40684-021-00318-7
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发表时间：
2021-02
影响因子：
4.2
通讯作者：
Qingan Yin;Changhe Li;Lan Dong;Xiufang Bai;Yanbin Zhang;Min Yang;Dongzhou Jia;Runze Li;Zhanqiang Liu
中科院分区：
文献类型：
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作者：
Qingan Yin;Changhe Li;Lan Dong;Xiufang Bai;Yanbin Zhang;Min Yang;Dongzhou Jia;Runze Li;Zhanqiang Liu
微量润滑是一种新兴的绿色、资源节约型加工技术，它是将微量润滑剂和气体混合、雾化后喷射出来。然而，MQL的开发仅限于矿物油，因为其不可降解且对环境和人类健康构成威胁。植物油具有生物降解性和可再生性，可以替代矿物油作为MQL的基础油。然而，具有不同理化性质的不同植物油在工具-工件界面处的润滑机理尚未被系统地揭示。为了验证不同植物油的界面润滑特性，基于5种植物油（棉籽油、棕榈油、蓖麻油、大豆油和花生油）进行了AISI 1045的MQL研磨实验。实验结果表明，棕榈油的铣削力最小（Fx= 312 N，Fy= 156 N），摩擦系数最小（0.78），表面粗糙度最小（Ra= 0.431 μm，RSm= 0.252 mm），工件表面最光滑。此外，还分析了植物油的理化性质（组成、分子结构、粘度、表面张力和接触角）。饱和脂肪酸含量高、粘度大、接触角小的棕榈油，能在刀具-工件界面形成强度最高、铺展面积最大的润滑油膜。因此，棕榈油可以达到最佳的润滑效果。
Minimum quantity lubrication (MQL) is an emerging green and resource-saving machining technique jetting minute amount lubricants and gas after mixing and atomization. However, MQL development is restricted to mineral oils because of its undegradability and threat to the environment and human health. Vegetable oils can replace mineral oils as base oil for MQL benefitting from its biodegradability and renewable property. Nevertheless, the lubrication mechanism at the tool-workpiece interface of different vegetable oils with various physicochemical properties has not been revealed systematically. In order to verify the interfacial lubrication characteristics of different vegetable oils, MQL milling experiments of AISI 1045 based on five vegetable oils (cottonseed, palm, castor, soybean, and peanut oils) were carried out. The experimental results showed that, palm oil obtained the lowest milling force (Fx= 312 N,Fy= 156 N), friction coefficient (0.78), and surface roughness values (Ra= 0.431 μm,RSm= 0.252 mm) and the smoothest surface of workpiece. Furthermore, the physiochemical properties (composition, molecular structure, viscosity, surface tension, and contact angle) of vegetable oil were analyzed. Palm oil with high content of saturated fatty acid, high viscosity and small contact angle can form the lubricating oil film with the highest strength and the largest spreading area at the tool-workpiece interface. Therefore, palm oil can achieve the optimal lubrication effect.