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激光弯曲成形是利用激光束的能量修整板材曲率的一种新型柔性无模成形加工方法。为探索激光弯曲三维成形的机制以及成形过程中的物理现象,对1Cr18Ni9Ti正方形薄板采用交叉线扫描策略激光弯曲三维成形制备了球冠面,利用显式动态有限元方法分析了正方形薄板在激光扫描过程中的温度、应力、应变、节点加速度与速度以及形变的变化情况,在二维激光成形温度梯度机制基础上探讨了激光弯曲三维成形中存在的物理现象。在扫描过程中,薄板整体的温度随着激光扫描逐渐增加,在任意时刻任意位置的加热都会造成整体薄板应力作用方向和大小的改变,应力变化是形成圆周线的趋势,由于扫描路径时空的变化导致正方形薄板四角的变形量有所不同。
Laser bending is the use of laser beam energy to trim the curvature of a new type of flexible mold-free processing methods. In order to explore the mechanism of laser bending three-dimensional forming and the physical phenomena in the forming process, the spherical crown was prepared by laser scanning three-dimensional cross-sectional scanning method using 1Cr18Ni9Ti square sheet. The dynamic finite element method was used to analyze the laser scanning process In the temperature, stress, strain, node acceleration and velocity as well as the change of deformation, the physical phenomenon existed in laser bending three-dimensional forming was discussed on the basis of two-dimensional laser forming temperature gradient mechanism. During the scanning process, the temperature of the whole sheet gradually increases with the laser scanning. The heating at any position at any time will cause the stress direction and size change of the whole sheet. The change of stress is the trend of forming the circumference line. Due to the change of space-time Resulting in the deformation of the square sheet four different angles.