کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
781494 1464502 2015 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An investigation of energy loss mechanisms in water-jet assisted underwater laser cutting process using an analytical model
ترجمه فارسی عنوان
تحقیق در زمینه مکانیزم از دست دادن انرژی در آب جت، با استفاده از یک مدل تحلیلی، فرایند برش لیزر زیر آب را پشتیبانی می کند
کلمات کلیدی
برش لیزری، زیر آب آب کمک، مدل تحلیلی، مدل پارامتر توزیع شده
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی


• An analytical model for water-jet assisted underwater laser cutting is presented.
• Model, among others includes convective and scattering losses.
• Predictions of the model have been validated with experimental results.
• Modulated power mode yields higher process efficiency compared to CW mode.

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 ~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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Machine Tools and Manufacture - Volume 91, April 2015, Pages 62–75
نویسندگان
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