Journal
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
Volume 119, Issue 9-10, Pages 5671-5685Publisher
SPRINGER LONDON LTD
DOI: 10.1007/s00170-022-08660-z
Keywords
Grinding; Residual stress; Nano-lubricant; Grinding force; Grinding temperature
Funding
- National Natural Science Foundation of China [51975305, 51905289]
- Major Research Project of Shandong Province [2019GGX104040, 2019GSF108236]
- Major Science and Technology Innovation Engineering Projects of Shandong Province [2019JZZY020111]
- Natural Science Foundation of Shandong Province [ZR2020KE027]
- National Key Research and Development Plan [2020YFB2010500]
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By simulating the residual stress of cemented carbide during grinding, it was found that using nanofluid minimum quantity lubrication can achieve the lowest friction coefficient, proving the model's reliability under dry grinding conditions.
The special mechanical properties of cemented carbide with high strength and hardness will cause complex stress due to excessive force and heat in the process of precision manufacturing, which will affect precision retention and endurance limit. Given the health and environmental threat of conventional flood cooling and the harsh processing environment of dry grinding, minimum quantity lubrication (MQL) has become an irreplaceable method to machining cemented carbide. However, the addition of nanoparticles changes the force and heat during grinding, which makes the influence on the residual stress of cemented carbide complicated. Therefore, based on the single abrasive grinding force model, the effective abrasive particle number was obtained by simulating the distribution of abrasive particles on the grinding wheel surface, and the mechanical stress model was established, which was loaded onto the workpiece in iterative attenuation mode. The thermal stress model was established based on the temperature field model. The final residual stress prediction model was obtained by determining whether the grinding process yields results and carrying out stress loading and stress relaxation. Experimental verification of the model was carried out under four different grinding conditions of YG8. The minimum friction coefficient of 0.385 was obtained under nanofluid minimum quantity lubrication (NMQL). In the precision analysis of the model, the minimum error value was 5.9% in the direction perpendicular to the feed direction of the workpiece in the dry grinding condition, which proved that the residual stress model had certain reliability.
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