钛合金板材激光弯曲成形工艺参量分析与弯曲角度预测

Parameter analysis and bending angle prediction of titanium alloy sheet in laser bending forming

为了分析激光弯曲成形过程中各个工艺参数对弯曲角度的影响,从而对弯曲角度进行预测,在激光弯曲成形过程中对激光功率、光斑大小、扫描速度、扫描次数、线能量密度等参数进行了合理控制,根据实验结果分析了各个工艺参量对弯曲角度的影响,并基于最小二乘法对激光弯曲角度进行了预测。结果表明当光斑大小和扫描速率等工艺参数恒定时,工件的形变角度随功率增大而逐渐增大,弯曲角度随扫描速率的增加呈先增后减的凸函数曲线形状;弯曲角度与扫描次数近似呈线性关系;弯曲角度随线能量密度增大先增大后减小。若激光弯曲后工件能够得到充分冷却,则每次扫描引起的角度增量基本相等。本实验条件下,线能量密度取6.7J·mm^-2时可在多次加工后获得最大弯曲角度。

To analyze the influence of various process parameters on bending angle during laser bending forming,so as to predict the bending angle,in the process of laser bending forming,the parameters such as laser power,spot size,scanning speed,scanning times and line energy density were well controlled. According to the experimental results,the influence of each process parameter on bending angle was analyzed,the laser bending angle was predicted based on the least squares method. The results show that when the process parameters such as spot size and scanning rate are constant,the deformation angle of the workpiece increases with the increase of power,and the bending angle shows the shape of the convex curve that increases first and then decreases with the scanning rate increases. The relationship between the scanning times and the bending angle is similar to linear. The bending angle increases first and then decreases as the line energy density increases. If the workpiece is sufficiently cooled after laser bending,the angular increments caused by each scan are substantially equal. Under these experimental conditions,the maximum bending angle can be obtained after multiple processing when the line energy density is 6. 7 J·mm-2.