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首页> 外文期刊>International Journal of Machine Tools & Manufacture: Design, research and application >An investigation of energy loss mechanisms in water-jet assisted underwater laser cutting process using an analytical model
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An investigation of energy loss mechanisms in water-jet assisted underwater laser cutting process using an analytical model

机译：使用解析模型研究水射流辅助水下激光切割过程中的能量损失机理

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摘要

The water-jet assisted underwater laser cutting processes has relatively low overall efficiency compared to gas assisted laser cutting process due to high convective loss in water-jet from the hot melt layer and scattering loss of laser radiation by the water vapour formed at the laser-workpiece-water interaction region. However, the individual contribution of different losses and their dependency on process parameters are not fully investigated. Therefore, a lumped parameter analytical model for this cutting process has been formulated considering various laser-material-water interaction phenomena, different loss mechanisms and shear force provided by the water-jet, and has been used to predict various output parameters including the maximum cutting speed, cut front temperature, cut kerf and the loss of laser power through different mechanisms as functions of laser power and water-jet speed. The predictions of cutting speed, kerf-width and cut front temperature were validated with the experimental results. The modeling revealed that the scattering in water vapour is the dominant loss mechanism, causing similar to 40-50% of laser power loss. This also predicted that the percentage losses are lower for higher laser powers and lower water-jet speeds. In order to minimize the deleterious effect of vapour, dynamics of its formation due to laser heating and its removal by water-jet was experimentally studied. And, the cutting was done with modulated power laser beam of different pulse on-and off-times to determine the pulse on-time sufficiently short to disallow growth of vapour layer, still cutting be effected and the off-time enough long for water-jet to remove the vapour layer from the interaction zone before next pulse arrives. Compared to CW laser beam the modulated laser beam of same average power yielded higher process efficiency. (C) 2015 Elsevier Ltd. All rights reserved.
机译：与气体辅助激光切割工艺相比，水喷射辅助水下激光切割工艺的整体效率相对较低，这是由于来自热熔层的水喷射中的对流损失很高，并且由于在激光作用下形成的水蒸气导致激光辐射的散射损耗较大。工件与水的相互作用区域。然而，没有充分研究不同损失的个体贡献及其对工艺参数的依赖性。因此，考虑到各种激光-材料-水的相互作用现象，水射流提供的不同损耗机理和剪切力，制定了用于该切割过程的集总参数分析模型，并将其用于预测包括最大切割在内的各种输出参数。速度，降低锋面温度，降低切缝和通过不同机制产生的激光功率损失，这些是激光功率和喷水速度的函数。实验结果验证了切削速度，切缝宽度和切削锋面温度的预测。该模型表明，水蒸气中的散射是主要的损耗机制，造成了约40-50％的激光功率损耗。这也预示着，对于更高的激光功率和更低的喷水速度，损耗百分比会更低。为了最小化蒸气的有害作用，实验研究了由于激光加热而形成蒸气的动力学以及通过喷水去除蒸气的动力学。并且，使用不同脉冲开启和关闭时间的调制功率激光束进行切割，以确定脉冲开启时间足够短以至于不允许蒸汽层的生长，仍然可以进行切割并且关闭时间对于水来说足够长。在下一个脉冲到达之前，用喷射器从相互作用区去除蒸汽层。与连续波激光束相比，相同平均功率的调制激光束具有更高的处理效率。 （C）2015 Elsevier Ltd.保留所有权利。

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