Abstract
For sheet metal parts with the vertical-wall partially and irregularly distributed on the sides (VWPIS) that contains both the difficult-form-surface (i.e., vertical-wall) with large forming angle and easy-to-form surface (i.e., gently tilted surface) with small forming angle, a selective multi-stage two point incremental forming (SMTPIF) on the basis of the forming angle was proposed. This SMTPIF method performs multi-stage forming only for the difficult-form-surface and gives different forming strategies and forming parameters to the different surface regions according to the forming angle. The algorithms for surface zoning, generation of the small forming angle surface for vertical-wall, generation of one-stage forming model by combining the easy-form-surface and small forming angle surface were presented. Meanwhile, the algorithm for the generation of the toolpath that is suitable to the SMTPIF was also given. The effectiveness of the proposed algorithm and the SMTPIF was verified by using the case studies, the finite element analysis, and the forming experiments. The results indicate that the SMTPIF can fabricate the VWPIS with short forming time and no sinking phenomenon.
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Abbreviations
- θ lim :
-
Forming limit angle
- θ i :
-
Forming angle of the i-th triangular face
- δ, ε :
-
Inclined plane
- θ δ, θ ε :
-
Inclined angle of the inclined plane
- I BG, I GG′, I GT :
-
Direction vector of the straight line
- η δ, η ο, η Δ :
-
Normal vector of the plane
- Δh :
-
Spacing of the equidistant horizontal plane
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Hu Zhu is a Professor in the College of Mechanical and Electrical Engineering at Shenyang Aerospace University. He received his B.S. from Jilin University, and M.S. and Ph.D. in the Department of Mechanical Design and Production Engineering at Seoul National University. His current research interests include CAD/CAM, 3D printing, CNC incremental forming.
Luteng Liu is currently an M.S. student in the College of Mechanical and Electrical Engineering at Shenyang Aerospace University. He received his B.S. from the Mechanical Manufacturing and Automation at Shenyang Aerospace University. His research interests include CAD/CAM, CNC incremental forming.
Yibo Liu is currently a Vice Professor in the Science and Technology Training Center at the Guidaojiaotong Polytechnic Institute. He received his M.S. from Shenyang Aerospace University. His research interests include CAD/CAM, CNC machining, and CNC incremental forming.
Jaeguan Kang is currently a Professor in the Division of Mechanical Engineering at the Kyungnam University. He received his Ph.D. from Pohang University of Science and Technology, M.S. from Korea Advanced Institute of Science and Technology, B.S. from Seoul National University. His primary research interests include CAD/CAM, Incremental sheet metal forming.
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Zhu, H., Liu, L., Liu, Y. et al. Research on the selective multi-stage two point incremental forming based on the forming angle. J Mech Sci Technol 35, 3643–3658 (2021). https://doi.org/10.1007/s12206-021-0735-5
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DOI: https://doi.org/10.1007/s12206-021-0735-5