Research on the Characteristics of Metal Sheet with Pulse Laser Forming

摘要

Laser forming of metal sheet is a forming technology of sheet without a die that the sheet is deformed by internal thermal stress induced by partially irradiation of a laser beam. In this paper, the bending behavior of common stainless steel 1Cr18Ni9 sheet is studied after being irradiated by straight line with a Nd:YAG pulse laser beam. The aim of the investigation is to find out the relationship of the bending angles and physical behaviors with the pulse parameters of the laser. The experimental results show that the pulse energy is the most important influencing factor which influences the bending angles in pulse laser forming of metal sheet in the pulse parameters. The microstructures show that the deformed grain structure is inhomogeneous, that caused the formation of the grain sizes and grain orientations are different in heat-affected zones. But the results of the X-ray diffraction analysis show that the contents of elements have little change between the irradiated zones and raw materials. And the hardness of irradiated zones is increasing in comparison to the initial raw hardness. By qualitative analysis of experimental result, the conclusion obtained may provide basis for theoretical investigation and possible industrial application of laser bending process in the future.