An analytical model of metal cutting with a laser beam
An analytical model of metal cutting with a laser beam
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DOI：
10.1063/1.361098
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发表时间：
1996-03
影响因子：
3.2
通讯作者：
A. Kaplan
中科院分区：
文献类型：
--
作者：
A. Kaplan
用激光束切割金属的过程是通过一个数学模型来描述的，该数学模型包含一组质量、动量和能量的平衡方程。切割前沿的熔膜被定义为控制体积。计算得出切割前沿特征宏观状态的平均值，例如温度、熔膜速度和熔膜厚度。模型中考虑了激光束和工艺气流的所有相关参数。分析模型的数值评估提供了惰性气体切割和氧气切割过程行为的解释。随着速度的增加，切口宽度变窄，这可以通过热传导来解释。此外，该模型表明薄金属板在高速下达到蒸发温度。使用较高的气压会增加扩散限制的氧化速率并提供更高的切割速度，而氧化金属的分数随着速度的增加而大幅减少。
The process of cutting metals with a laser beam is described by a mathematical model comprising a set of balance equations for mass, momentum and energy. The molten film at the cutting front is defined as the control volume. The calculation yields average values for the characteristic macroscopic state of the cutting front, such as temperature, melt film velocity and melt film thickness. All relevant parameters of the laser beam and of the process gas flow are considered in the model. Numerical evaluations of the analytical model provide explanations of the process behavior both for inert and for oxygen gas cutting. The narrowing of the kerf width with increasing speed is explained by heat conduction. Furthermore, the model shows that the evaporation temperature is reached at high velocities for thin metal sheets. Using a higher gas pressure increases the diffusion limited oxidation rate and provides higher cutting velocities, while the fraction of oxidized metal decreases substantially with increasing speed.