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首页> 外文期刊>International Journal of Machine Tools & Manufacture: Design, research and application >Development and parametric study of a water-jet assisted underwater laser cutting process
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Development and parametric study of a water-jet assisted underwater laser cutting process

机译：水射流辅助水下激光切割工艺的发展与参数研究

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The conventional underwater laser cutting process usually utilizes a high pressure gas jet along with the laser beam to create a dry condition in the cutting zone and eject out the molten material. This causes a lot of gas bubbles and turbulence in water, and produces aerosols and waste gas. This may cause contamination in the surrounding atmosphere, while cutting the radioactive components. In order to minimize this effect, a water-jet assisted underwater laser cutting technique has been developed using a high power fiber laser. A high velocity coaxial water-jet has been employed in place of gas-jet to remove the molten material through the kerf. Some amount of water vapour bubbles is formed at the laser-metal-water interface; however, they tend to condense as they rise up through the surrounding water. AISI 304 stainless steel sheet of maximum 1.5 mm thickness was cut at 1.4 m/min cutting speed with the present setup at 1800 W CW laser power, and the resulting average kerf-width was about 0.75 mm. The heat convection by water jet and the scattering of laser beam by vapour were found to influence significantly the energy efficiency of the cutting process. The effects of various processing parameters on the cutting performance were investigated. The energy efficiency improved at higher cutting speeds. An energy balance model with various loss mechanisms included has been also developed.
机译：常规的水下激光切割工艺通常利用高压气体射流与激光束一起在切割区域中形成干燥状态并喷射出熔融材料。这会在水中引起大量气泡和湍流，并产生气溶胶和废气。在切割放射性成分的同时，这可能会导致周围大气的污染。为了使这种影响最小化，已经开发了使用高功率光纤激光器的水刀辅助水下激光切割技术。已经使用高速同轴水射流代替气体射流以通过切缝去除熔融材料。在激光-金属-水的界面处会形成一些水蒸气气泡。但是，当它们从周围的水中升起时，它们往往会冷凝。在当前设置为1800 W CW激光功率下，以1.4 m / min的切割速度切割厚度最大为1.5 mm的AISI 304不锈钢板，并且平均切缝宽度约为0.75 mm。发现水射流的热对流和蒸气对激光束的散射会显着影响切割过程的能量效率。研究了各种加工参数对切削性能的影响。更高的切割速度可提高能源效率。还开发了包含各种损失机制的能量平衡模型。

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