Numerical Simulation Of Laser Bending 1Cr17Ni2 Stainless Steel

Laser bending is a recently developed and highly flexible metal forming technique, which doesn't need die or outside force. For this technique, bending is realized just by optimizing laser bending process and exactly controlling the distribution of temperature in the thermal effecting zone to obtain proper value and distribution of the thermal stress. As a new laser forming progress and plastic forming method, laser forming technology is showing a appealing future, and a large number of domestic and overseas experts have been carrying out researches on this subject.In this paper, based on the analyzing of the thermal and mechanical properties of the materials, a 3-D thermal-mechanical coupled model of laser sheet bending has been set up. The stress-strain fields, temperature fields and deformation fields are obtained by numerical simulating of laser scanning of lCrl7Ni2 stainless steel sheet for one time with MSC. Marc software. Moreover, the forming progress and mechanism have been analyzed. The results of simulation show that : sharp temperature gradient along blank thickness is produced when the high power laser beam scanned the blank , and the plastic strain produced alone the thickness is very different, which results in bending of blank.The effects of laser process parameters, geometric parameters of sheet on bending angle have been studied systematically to show laser bending rules of 1Cr17Ni2. The result shows that the bending angle decreases with the increasing of sheet metal thickness, focus diameter or scanning speed, but increases with the increasing of laser power or blank wideness if other factors remain unchanged. And using orthogonal method, the order of influencing of key parameters on bending angle and the optimal laser bending process of 1Cr17Ni2 have been obtained under given conditions.