ガス発生剤による超塑性5083アルミニウム合金の新しいパルジ成形法

摘要

Gas blow forming originally developed to thermoplastics has been revised and applied to superplastic alloy sheets. It involves, however, low production rate, high cost for forming tools and poor working environment due to heating. Instead of using inert gas or air blowing, dilatational work of inert gases during heating was inspired by authors as a kind of pressure source. Several gas generants being used in forming foamed plastics or metals and air bag in car seem to be available for the purpose. A few of gas generants in form of powder were tentatively selected and supplied for experiments here. Conventional gas blow forming and proposed method with using these gas generants were compared with regard to formability and cavitation. Experimental results on superplastic aluminum sheets obviously demonstrate a feasibility of practical use of it in engineering application.