Asymmetric single point incremental forming of sheet metal

The mechanism of incremental sheet metal forming is based on plastic and localized deformation of sheet metal. The sheet metal is formed using a hemispherical-head tool in accordance with the path ...

Investigation of the ultrasonic vibration effect in incremental sheet metal forming process

Laser forming of a dome shaped surface: Experimental investigations, statistical analysis and neural network modeling

Forming sheet metal by laser-induced thermal stress (laser forming) is considered to offer great potential for rapid prototyping and flexible manufacturing. Accordingly, many studies have been carried out in different areas of laser forming. However, in order to apply the laser-forming process to real 3D products, a method that encompasses the whole process planning is required, including the laser irradiation patterns, laser power, and travel speed, when the target shape is given. In this work, a new method for 3D laser forming of sheet metal is proposed. This method uses geometrical information rather than a complicated stress–strain analysis. Using this new method the total calculation time is reduced considerably while affording strong potential for enhanced accuracy. Two different target shapes were formed by laser irradiation with the proposed procedure to validate the algorithm.

3D laser-forming strategies for sheet metal by geometrical information

The use of computers in manufacturing has enabled the development of several new sheet metal forming processes. This paper describes modifications that have been made to traditional forming methods such as conventional spinning and shear forming, where deformation is localized. Recent advances have enabled this localized deformation to be accurately controlled and studied. Current developments have been focused on forming asymmetric parts using CNC technology, without the need for costly dies. Asymmetric Incremental Forming has the potential to revolutionize sheet metal forming, making it accessible to all levels of manufacturing.

Asymmetric incremental sheet forming

Although forming sheet metal by laser-induced thermal stresses (laser forming) has been extensively studied, the research has mainly focused on a single angle forming process. The task of free curve laser forming of sheet metal is to determine a set of process parameters such as laser scanning paths, laser power and scanning speed that will make a given shape. Two methods were used for generating the laser scanning paths and the bending angles of each path. Each method was analyzed by computer simulation and the two methods were compared. Experiments verified the applicability of the proposed methods.

Development of irradiation strategies for free curve laser forming

Forming sheet metal by laser-induced thermal stress (laser forming) is considered to have a great potential for rapid prototyping and other flexible manufacturing. However, the previous researches have mainly focused on analyzing the phenomena of the forming process. In 2D free curve laser forming, a feedback control scheme for each single bending angle was suggested in this study by incorporating a statistical method and the effect of the remaining errors was discussed. Methods of compensating for the remaining errors were proposed and analyzed by computer simulations. Experiments verified the applicability of the proposed methods.

Feedback control for 2D free curve laser forming

Forming sheet metal by laser-induced thermal stress (laser forming) is considered to offer great potential for rapid prototyping and other flexible manufacturing. In order to apply the laser forming process to real 3D products, a method that encompasses the whole process planning, including the laser irradiation patterns, laser power, and travel speed, when the target shape is given. In this work a method for 3D laser forming of sheet metal is proposed by using a geometrical information rather than a complicated stress-strain analysis. Using this method the total calculation time is reduced considerably while affording strong potential for enhanced accuracy.

3D laser forming strategies for sheet metal by geometrical information

In this paper, a geometrical sensing model was developed for the rotating arc sensor in gas metal arc welding (GMAW) of fillet joints that have open and closed ends, considering the mathematical model of the GMA welding system. By using the two developed models, simulations of welding current of the rotating arc sensor were performed and compared with the experimental results of current waveform in open and closed fillet joints in steel welding.

Jitae Kim

Papers

Development of irradiation strategies for free curve laser forming

3D laser-forming strategies for sheet metal by geometrical information

Feedback control for 2D free curve laser forming

3D laser forming strategies for sheet metal by geometrical information

End point detection of fillet weld using mechanized rotating arc sensor in GMAW