Conical Forming of Sheet Metals by Gas Mixture Explosion Metod

In this paper a new approach for forming sheet metals by explosion of gas mixtures is presented. As the sheet metal shapes by the impact and pressure resulted from the explosion, it undergoes through a plastic deformation phase. Testing apparatus which is built for the first time in Iran, consists of a thick-walled cylinder (expolsion chamber), various dies for shaping, and measuring instruments. Unlike techniques used in conventional systems, in this method, the wave impact acts as the male part of the die to form and produce different engineering components. Experimental results presented show the effect of various parameters such as thickness, boundary conditions, and the material type of the work-piece, also the percentage of gas mixture on the distribution of thickness/circumferential strain in the work-piece. Furthermore, an analytical model based on the plastic work calculations for the sheet metal deformation is presented.