薄板激光切割气熔比数学建模及试验验证  

Vaporization-melt Ratio Mathematical Model and Experiments of Laser Cutting Sheet Metal

作　　者：孟庆轩[1] 王续跃[1] 徐文骥[1] 康仁科[1] 郭东明[1] 

机构地区：[1]大连理工大学机械工程学院,大连116024

出　　处：《机械工程学报》2011年第17期172-178,共7页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(50975041;50775019)

摘　　要：为研究薄板激光切割气熔比规律,分析激光切割区域内材料气化和熔化去除的形式,研究熔化层能量和质量流动状态,建立薄板激光切割的气熔比数学模型,并得到气熔比值和残留熔融层厚度随激光功率和扫描速度的变化。借助激光切割半径的回归修正,模拟得到激光切割0.5 mm厚6063铝合金薄板时气熔比值及残留熔融层厚度。发现随激光功率增大和扫描速度的降低,气熔比增大,残留熔融层厚度减小。在JK701H型激光加工系统进行验证试验,得到并观察65 W、2.2 mm/s,85 W、2 mm/s和105 W、1.8 mm/s三种参数下的切口,计算试验气熔比值和残留熔融层厚度,表明模拟结果与试验基本吻合,验证模型的可行性,为基于气熔比控制的激光精密切割工艺提供重要依据。A mathematical model of vaporization-melt ratio is developed for improving of the quality in laser cutting sheet metal.The material remove forms of vaporization and melt in cutting area are analyzed,and the energy and mass flow are researched.Variation of vaporization-melt ratio and thickness of residual molten layer with laser power and scanning speed are obtained.The vaporization-melt ratio and the thickness of residual molten layer during laser cutting of 6063 aluminum sheets,0.5 mm in thickness,are simulated under the regression correction of cut radius.It is found that vaporization-melt ratio increase with laser power and the decrease with scanning speed,as opposed to the thickness of residual molten layer.Experimental verification is carried out on a JK701H laser machining system.Three cuts are achieved under different parameters,which are 65 W 2.2 mm/s,85 W 2 mm/s and 105W 1.8 mm/s,respectively.Vaporization-melt ratio and thickness of residual molten layer are calculated.The results show good agreement between vaporization-melt ratio model and experiments.The analysis verifies this model is feasible and it makes contribution to laser precision cutting.

关 键 词：激光切割 薄板 气熔比 数学模型 试验验证 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TN249[电子电信—物理电子学]