| Improvement of formability for fabricating thin continuously corrugated structures in sheet metal forming process
"Sung-Woo Choi, Sang Hu Park*, Ho-Seung Jeong, JongRae Cho, Seonghun Park
The Journal of Mechanical Science and Technology, vol. 26, no. 8, pp.2397-2403, 2012
Abstract : "A stamping process is widely used for fabricating various sheet metal parts for vehicles, airplanes, and electronic devices by the merit
of low processing cost and high productivity. Recently, the use of thin sheets with a corrugated structure for sheet metal parts has rapidly
increased for use in energy management devices, such as heat exchangers, separators in fuel cells, and many others. However, it is not
easy to make thin corrugated structures directly using a single-step stamping process due to their geometrical complexity and very thin
thickness. To solve this problem, a multi-step stamping (MSS) process that includes a heat treatment process to improve formability is
proposed in this work: the sequential process is the initial stamping, heat treatment, and final shaping. By the proposed method, we
achieved successful results in fabricating thin corrugated structures with an average thickness of 75 μm and increased formability of
about 31% compared to the single-step stamping process. Such structures can be used in a plate-type heat exchanger requiring low
weight and a compact shape."
Keyword : Multi-step stamping; Multi-step tensile test; Plate type heat exchanger; Corrugated structure; High aspect ratio structure |
