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Science and Technology of Energetic Materials

Vol.64, No.1 (2003)

Research paper-ISEM2002 proceeding-

The new trial of explosive forming
Hirofumi Iyama, Shiro Nagano, and Shigeru Itoh
p.52-59

Abstract

In recent years, many studies for increased productivity of metal forming have been performed. In these fields, it is important to decrease production cost make lower. However, in general a very expensive metal die is necessary for metal forming. Consequently, it is difficult to decrease the cost by excluding the metal die. We have been developing a technique for metal forming without using the metal die as a novel method for lowering costs. We have considered the free forming by explosives using underwater shock wave generated by detonation of explosives placed in water. This technique uses only a metal die with circular edges, it does not use an expensive metal die with the same shape as the product. We investigated varying the pressure condition acted on the metal plate by changing the set position of the explosive. We have also been trying to establish metal pipe forming using an underwater shock wave. In this technique the cross section becomes a desired shape using the underwater shock wave by detonation of explosive in water.
   In this paper, we present some experiments of these methods (free metal forming and metal pipe forming) and some simulation results by FDM (Finite Difference Method). This numerical simulation can express the detonation process of explosive, the propagation of the underwater shock wave and the deformation process of a metal plate or a pipe.

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