摘要
通过改变激光功率、扫描速度、光斑直径、扫描次数及板料宽度对2 mm厚度的AISI304不锈钢板料进行激光热应力弯曲试验,分析了各工艺参数对弯曲角度的影响规律,对工件表面烧蚀情况进行评价,并对板料金相组织进行观察分析。试验结果表明:在试验参数范围内激光扫描次数、光斑直径、扫描速度和板料宽度对弯曲角度呈近似线性规律,而激光功率对弯曲角度的影响不呈线性规律;较大的面能量密度产生较大的弯曲角度。可通过工艺参数的合理组合在保证板料表面质量的前提下采用较大的面能量密度进行扫描以提高弯曲变形的效率。以上研究为精确控制板料激光弯曲成形奠定基础。
In the laser bending experiment of AISI 304-sheet metal,laser beam energy,scanning velocity,diameter of laser spot,scanning times and width of sheet metal were varied to investigate the effects of the process parameters on bending angle.The ablation of the specimens has been evaluated and the microstructure of AISI304-sheet metal has been investigated in the experiment as well.The result shows that within the range of tested,the laser parameters except laser beam energy,such as scanning times,scanning velocity,diameter of laser spot,and width of sheet metal in bending test are nearly linear with the bending angle.The energy density of the laser spot has a strong influence on the bending angle,and the bending angle increases with an increase of the areal energy density.For a given kind of sheet metal,there is a group of processing parameters to enable the sheet metal to obtain the largest bending angle under assuring surface quality.This work can provide the experimental foundation to accurately control the sheet forming by laser induced thermal stress.
出处
《应用激光》
CSCD
北大核心
2012年第5期403-407,共5页
Applied Laser
基金
安徽省高校省级自然基金项目(项目编号:K01076)
关键词
激光成形
板料
热应力
面能量密度
微观组织
laser forming
sheet metal
thermal stress
areal energy density
microstructure
