Seminar: Hot Stamping Process Design for Improvement of Formability
Seminar by Eiichi Ota
Toyota Central R&D Labs
Formability in hot stamping is improved by controlling temperature distribution during the forming process. In the standard hot stamping process, its deformation proceeds with non-isothermally. The resulting temperature distribution leads to local deformation at low forming depths during deep drawing process. To suppress this local deformation, we propose two temperature controlling techniques: 1) Partial cooling by air-blowing for boron steel sheets and 2) Press motion controlling for aluminum alloy sheets. An experimental deep-drawing result showed that the forming limit depth was increased to three times deeper depth by the partial cooling technique compared to that of the standard hot stamping process. In addition, we have developed a CAE-based process design method in order to apply the temperature controlling techniques to a variety of product shapes. The diversity of shapes achievable by hot stamping would be increased by the proposed forming process and its process design method.
Eiichi Ota is a researcher at Toyota Central R&D Labs, where he develops a heat-assisted sheet metal forming process, including steel hot stamping and aluminum warm forming. He has worked on material modeling for failure prediction, formability improvement for heated sheet metal and selective heat treatment for tailored properties. His approach involves controlling of temperature distribution during forming process and its process design based on numerical simulation.
He has worked at Toyota Central R&D Labs for 10 years since graduating B.S. in Engineering at Nagoya University. He has experiences as a short-term visiting scholar in New Hampshire University for one-month and Northwestern University for six-months.