关键词: 薄板, 激光切割, 气熔比, 试验验证, 数学模型

Abstract: 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.

Key words: Experimental verification, Laser cutting, Mathematical model, Sheet metal, Vaporization-melt ratio