Abstract
Due to the difference in velocity of metal flow between the corner area and the straight edge area of the flange during box-shaped part drawing, the resulting induced shear stress leads to uneven deformation. In the present research, a zoned lubrication process based on forced lubrication technology for box-shaped part deep drawing is proposed. The lubrication conditions in various areas in the flange area can be adjusted individually to improve metal flow. The pressurized lubricant is flushed into the contact gap between the sheet metal and the dies by the hydraulic pump. The oil discharge grooves machined on the die surface divide the flange area into straight edge area and corner area, and each area is supplied with oil independently to achieve the purpose of zoned lubrication by reasonably regulating the oil flow parameters. The evaluation indexes of deformation uniformity with strain and thickness variation rate (TVR) as reference variables are established to qualitatively and quantitatively evaluate the deformation uniformity. The tests of zoned lubrication drawing process for box-shaped parts were carried out under different loading paths. The results demonstrate that the uniformity evaluation indexes have a decreasing trend after zoned lubrication, reflecting that the deformation uniformity has been improved. In addition, the surface morphology and thickness variation of the formed parts both demonstrate the positive effect of forced lubrication. The feasibility and effectiveness of the proposed process are verified. It has certain guiding significance for improving the overall forming quality in the actual production of the parts with complex structures.
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Acknowledgements
The authors would like to thank the staff of Forging and Packaging laboratory (Yanshan University) for their great help and suggestions in the experiments.
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Methodology: Duan Chen and Changcai Zhao; experimental work: Duan Chen and Xiaoyi Chen; data analysis: Duan Chen and Guang Chen; 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 zoned lubrication process based on forced lubrication technology during box-shaped part deep drawing. Int J Adv Manuf Technol 123, 1099–1110 (2022). https://doi.org/10.1007/s00170-022-10241-z
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DOI: https://doi.org/10.1007/s00170-022-10241-z