Kyoto University · Engineering
Professor Takayuki Hama's research lab specializes in advanced forming processes and mechanical behavior of metallic materials, with a focus on sheet and tube hydroforming, springback prediction, and deformation mechanisms in lightweight alloys such as magnesium, titanium, and aluminum. The lab combines experimental investigations with advanced finite element modeling to optimize forming processes, particularly emphasizing the effects of temperature, pressure control, and process parameters on formability and dimensional accuracy. Their work also explores time-dependent material behavior, including stress relaxation and creep, to improve the reliability and efficiency of forming technologies in automotive and structural applications.
Figures are computed from collected data and may differ slightly.
In this study, we carried out a two-dimensional draw-bending test on an AZ31B magnesium alloy sheet at various forming temperatures and blank holding forces, and the springback characteristics of the Mg alloy sheet were systematically examined. The amount of springback decreased with increasing temperature and blank holding force. The decrease in the amount of springback caused by the increase in temperature was much larger than that caused by the increase in blank holding force, which indicated
Recently, tube hydroforming is receiving increasing attention. Knowledge on the process is, however, still insufficient to produce high-quality products in an efficient way. Hammering hydroforming, in which the hydraulic pressure is pulsated synchronously with axial feeding, is an effective method of improving forming ability. However, the factors that cause the improvement are still unclear. In the research reported in this paper, simulations of an automotive component produced by hammering hyd
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