Investigation of optimum condition in oxygen gas-assisted laser cutting

被引:19
作者
Golnabi, H. [1 ]
Bahar, M. [2 ]
机构
[1] Sharif Univ Technol, Inst Water & Energy, Tehran, Iran
[2] Teacher Training Univ, Dept Phys, Tehran, Iran
关键词
Oxygen gas; Speed; Nd:YAG laser; ND-YAG LASER; STAINLESS-STEEL; MULTIOBJECTIVE OPTIMIZATION; SHEET;
D O I
10.1016/j.optlastec.2008.08.001
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Laser cutting characteristics including power level and cutting gas pressure are investigated in order to obtain an optimum kerf width. The kerf width is investigated for a laser power range of 50-170 W and a gas pressure of 1-6 bar for steel and mild steel materials. Variation of sample thickness, material type, gas pressure and laser power on the average cut width and slot quality are investigated. Optimum conditions for the steel and mild steel materials with a thickness range of 1-2 mm are obtained. The optimum condition for the steel cutting results in a minimum average kerf width of 0.2 mm at a laser power of 67 W, cutting rate of 7.1 mm/s and an oxygen pressure of 4 bar. A similar investigation for the mild steel cutting results in a minimum average kerf width of 0.3 mm at the same laser power of 67 W, cutting rate of 9.5 mm/s, and an oxygen pressure of I bar. The experimental average kerf is about 0.3 mm, which is approximately equal to the estimated focused beam diameter of 0.27 mm for our focusing lens (f = 4 cm and 100 W power). This beam size leads to a laser intensity of about 1.74 x 10(9) W/m(2) at the workpiece surface. The estimated cutting rate from theoretical calculation is about 8.07 mm/s (1.0 mm thickness and 100 W power), which agrees with the experimental results that is 7.1 mm/s for 1.0 mm thickness of mild steel at the laser power of 88 W. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:454 / 460
页数:7
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