| 摘要 |
PURPOSE:To produce a composite laminated thick steel sheet with excellent vibrationproof property by heating a laminated steel sheet wherein a resin contg. a foaming agent is laminated between steel sheets at a foaming temp. or higher of the foaming agent. CONSTITUTION:After a foamable resin is laminated between steel sheets at a temp. lower than the foaming temp. of a foaming agent, when the whole laminate is heated at the foaming temp. or higher, the vol. is expanded to (1.5-10)-fold depending on the degree of mixing of the foaming agent. By selecting a proper foaming ratio in accordance with the wt. of the steel sheet, it is therefore possible to support the wt. of the steel sheet and to ensure a necessary resin thickness. In addition, followability to the unevenness of the steel sheet can be improved and gaps and floating which decrease vibrationproof characteristics can be prevented from occurrence. In addition, as there is a possibility that characteristics of upper and lower steel sheets are changed when the heating temp. becomes higher, heating at a temp. of 400 deg.C or lower is pref. |
