Numerical simulation of edge effect in plasma arc forming of sheet metal
Edge effect was found in plasma arc forming process of sheet metal, which reduces the forming accuracy of sheet metal seriously. In order to reveal the forming mechanism and forming laws of the edge effect. A numerical model on forming of sheet metal using plasma arc with scanning along a straight line was established and the forming mechanism and forming laws of the edge effect were studied. The results showed that the upper material and the lower material of the edge were produced shrinkage along the scanning path and both shrinkage were different. The size relationship of the two shrinkage determines the direction of edge warp. The difference of the two shrinkage affects the warpage of the edge. In the comprehensive effect of shrinkage and warpage, the non scanning region in the both sides of the scanning path appears bulge or depression. The numerical analysis results were agree well with the experimental results. The conclusions provide a theoretical basis to reduce the effect of the edge effect on the accuracy of the sheet metal forming.
Study on flexible forming of sheet metal using plasma arc
The technology of flexible forming for sheet metal ultilized by thermal stress-strain now gradually becomes a focus of research both at home and abroad.Compared with another heating source,plasma arc is more economical,safe,flexible and practical.However,at present,researches on flexible forming of sheet metal using plasma arc are very limited,such as only using scanning path by straight line,investigating microstructure development in heat affecting zone of sheet metal,etc.The following issues have been investigated the mechanisms and characteristics theories,then through different shapes of sheet metal,researched the difference using scanning path through straight line and curve line,and the influence of different shapes by experiment and analysis.
Advances in laser forming
Laser forming is fast emerging as a viable means for the shaping of metallic components, as a means of rapid prototyping and of adjusting and aligning. Relevant industry sectors include aerospace, automotive, and microelectronics. In contrast with conventional forming techniques this method requires no mechanical contact and hence offers many of the advantages of process flexibility associated with other laser manufacturing techniques such as laser cutting and marking. This article reviews the mechanisms involved and the main models proposed in laser forming and presents an overview of the main applications currently developed. An assessment is made of the potential for future development of this new technology.