Dual Synergistic Lubrication Mechanism of Nano-fluid and Grinding Wheel Prepared by CNTs@T321 Nano-capsules

doi:10.3901/JME.2024.09.351

Abstract

Abstract: During the grinding process, the airflow barrier created by the grinding wheel can preventd the grinding fluid from infiltrating the grinding zone and exerting its effects. Therefore, traditional improvement methods such as intensified pouring of grinding fluid and minimum quantity lubrication (MQL) also struggle to achieve the ideal lubrication and cooling effects. To address this issue, the use of carbon nanotubes (CNTs) nano-capsules filled with T321 sulfurized isobutylene (CNTs@T321) as additives is proposed. Grinding wheels and nano-fluids filled with nano-capsules are then prepared separately. During grinding, the nano-capsules directly release the lubricant at the grinding interface, providing self-lubrication. First, the nano-capsules are prepared and characterized, followed by the preparation of grinding wheels and nano-fluids. Experiments are conducted under MQL conditions to grind GCr15 steel, and the mechanism of nano-capsule release of T321 and the formation of a self-lubricating film are revealed. The results show that compared to traditional grinding wheels and processes, the nano-capsule grinding wheel under nanofluids grinding conditions reduces grinding force, grinding temperature, and surface roughness values by 41%, 37%, and 17%, respectively, while improving the grinding ratio by 23%. The nano-capsules in the grinding wheel first release T321 to provide self-lubrication, and the intervention of the nanofluid further enhances lubrication and cooling in the grinding zone. It is this dual synergistic lubrication mechanism that improves the grinding performance of the process system.

Key words: CNTs, nano-capsules, grinding wheel, grinding fluids, lubrication mechanism

CLC Number:

TH162

GUAN Jiju, ZHU Zhengbing, XU Zhengya, LUAN Zhiqiang, XU Xuefeng. Dual Synergistic Lubrication Mechanism of Nano-fluid and Grinding Wheel Prepared by CNTs@T321 Nano-capsules[J]. Journal of Mechanical Engineering, 2024, 60(9): 351-363.

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