Journal
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
Volume 13, Issue 5, Pages -Publisher
ASME
DOI: 10.1115/1.4049982
Keywords
grinding; nanofluid minimum quantity lubrication cooling; temperature field; specific grinding force; G ratio; heat transfer enhancement; micro; nanoscale heat transfer
Categories
Funding
- National Natural Science Foundation of China [51975305, 51905289]
- Major Research Project of Shandong Province [2019GGX104040, 2019GSF108236]
- Shandong Provincial Natural Science Foundation of China [ZR2019PEE008]
- Major Science and Technology Innovation Engineering Projects of Shandong Province [2019JZZY020111]
- Applied Basic Research Youth Project of Qingdao Science and Technology Plan [19-6-2-63-cg]
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Nanofluid minimum quantity lubrication (NMQL) demonstrates better stability and lower grinding zone temperatures compared to traditional flood lubrication when grinding cemented carbide. It achieves the highest G ratio, lowest specific grinding force, and is proven to be suitable for grinding cemented carbide.
Nanofluid minimum quantity lubrication (NMQL) has better stability, higher thermal conductivity, and excellent lubrication performance compared with traditional flood lubrication. The heat transfer model and finite difference model were established to verify the feasibility of NMQL conditions in grinding cemented carbide. Based on them, the grinding temperature of cemented carbide is calculated numerically. Results show that the grinding zone temperatures of flood grinding and NMQL are lower, 85.9 degrees C and 143.2 degrees C, respectively. Surface grinding experiments of cemented carbide YG8 under different working conditions are carried out. Dry grinding (227.2 degrees C) is used as the control group. Grinding zone temperatures of flood grinding, minimum quantity lubrication, and NMQL decrease by 64.2%, 39.5%, and 20.4%, respectively. The error is 6.3% between theoretical calculation temperature and experimental measurement temperature. Based on machining process parameters (specific grinding force, force ratio) and experimental results (microstructure of grinding wheel, workpiece, and grinding debris), the effects of different working conditions on wheel wear are studied. NMQL achieves the highest G ratio of 6.45, the smallest specific grinding force, and the smallest F-n/F-t ratio of 2.84, which further proves that NMQL is suitable for grinding cemented carbide.
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