Abstract
Friction and lubrication are important parameters that affect the quality of sheet metal forming; excellent lubrication conditions and less harmful friction can reduce local thinning, delay fracture, and improve surface quality. Aiming at the poor friction conditions and difficult lubrication in the flange area during deep drawing, an active pressurized forced lubrication deep drawing (FLDD) process was proposed in this paper. A hydraulic system was employed to flush high-pressure lubricating oil into the contact gap between the die and sheet in the flange area. The high-pressure hydrostatic oil film in the contact gap can reduce the real contact area and effectively improve the lubrication conditions. The equipment is simple, the cost is low, and the lubricating oil pressure can be measured and controlled. Under the conditions of 20-kN, 35-kN, and 50-kN blank holder force (BHF), FLDD testing of box parts was carried out with 5-MPa and 9-MPa pressure using water-based lubricating oil. The horizontal comparison experiment was conducted with vegetable oil and water-based lubricating oil under the same process conditions. The test results illustrated that the lubrication effect of vegetable oil was the worst, whereas the lubrication effect of water-based mineral lubricant was significantly improved after pressurization. The maximum forming height was increased by 17.97%, the maximum forming force was reduced by 8.9%, the maximum wall thickness thinning rate was decreased by 7%, and the lubrication effect at 9-MPa pressure was superior to that of 5 MPa. The FLDD process has definite application value in improving the production environment, pollution control, and automatic production.
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Acknowledgements
The authors would like to thank the forging and packaging experiment teachers of Yanshan University for their great help and suggestions in the process test.
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Methodology, Duan Chen, Changcai Zhao; experimental work, Duan Chen, Haoyang Li, Xiaoyi Chen; data analysis, Duan Chen, Haoyang Li, and Xin Zhang; writing and editing, Duan Chen and Changcai Zhao. All authors have read and agreed to the published version of the manuscript.
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Chen, D., Zhao, C., Chen, X. et al. Research on the active pressurized forced lubrication deep drawing process and evaluation of the lubrication effect. Int J Adv Manuf Technol 120, 2815–2826 (2022). https://doi.org/10.1007/s00170-022-08892-z
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DOI: https://doi.org/10.1007/s00170-022-08892-z