Modeling and optimization of laser bending parameters via response surface methodology

2012 ◽  
Vol 227 (7) ◽  
pp. 1577-1584 ◽  
Author(s):  
Esmaeil Ghadiri Zahrani ◽  
Abdolali Marasi
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Sheet Thickness ◽  
Free Edge ◽  
Simultaneous Optimization ◽  
Laser Forming ◽  
Beam Diameter ◽  
Forming Process ◽  
Bending Angle ◽  
Modeling And Optimization

The existence of various variables in the laser forming process brings about the implementation of two important issues of modeling and optimization to more precisely predict bending angle so as to achieve desirable conditions. In this paper, the effect of independent process parameters such as laser power, beam diameter, scan speed, sheet thickness and also the heating position on the resulted bending angle from the sheet free edge was investigated through experimentation. The results indicate different influence of parameters on the angle. Also, using response surface methodology and after conducting analysis of variance, an efficient second-order mathematical model was fit to bending angle. Consequently, with the aim of making bending angle robust in relation to possible parametric fluctuations in the process, a simultaneous optimization was carried out by use of propagation of error approach and optimal parametric combination to reach the maximum value of the angle.

An experimental investigation of parameters effect on laser forming of Al6061-T6 sheets

2015 ◽  
Vol 231 (5) ◽  
pp. 433-442 ◽  
Author(s):  
Amir H Roohi ◽  
H Moslemi Naeini ◽  
M Hoseinpour Gollo
Keyword(s):  
Laser Power ◽  
Sheet Thickness ◽  
Laser Forming ◽  
Direct Relation ◽  
Beam Irradiation ◽  
Forming Process ◽  
Bending Angle ◽  
Thermal Forming ◽  
Laser Beam Irradiation ◽  
Experimental Runs

Laser forming, which is categorized as a thermal forming process, is used in forming and bending of metallic and non-metallic sheets. Laser beam irradiation causes a localized temperature increase and a localized mechanical strength decrease. In this article, the effects of four process parameters, comprising laser power, scan velocity, the number of scan passes, and sheet thickness, on laser forming of Al6061-T6 sheets are studied. A design of experiment, including response surface methodology, is carried out to limit the experimental runs and costs and to identify the parameter effects on the bending angle of the sheet. Experiment results show that bending angle increases due to the decrease of scan velocity and sheet thickness. In addition, laser power and number of scan passes have a direct relation with a final sheet forming.

Effects of Clamping on the Laser Forming Process

2006 ◽  
Vol 129 (6) ◽  
pp. 1035-1044 ◽  
Author(s):  
A. J. Birnbaum ◽  
P. Cheng ◽  
Y. L. Yao
Keyword(s):  
Thermal Field ◽  
Laser Forming ◽  
Considerable Effort ◽  
Forming Process ◽  
Thermal Problem ◽  
Bending Angle ◽  
Mechanical Constraints ◽  
Thermal Constraints ◽  
Close Proximity ◽  
Multiple Scan

Although considerable effort has gone into characterizing the laser forming process in terms of process parameters and conditions, there has been little emphasis on the effects of the mechanical and thermal constraints introduced by the clamping method utilized for a desired application. This research suggests means for investigating and predicting the resulting geometry of a specimen due to laser operation in close proximity to an array of imposed thermo-mechanical constraints for both the single and multiple scan cases; specifically, the resulting average bending angle as well as bending angle variations throughout the part. This is accomplished by initially only considering these effects on the thermal field. Conclusions are then drawn about the nature of the mechanical effects. These conclusions are validated through numerical simulation as well as physical experimentation. An analytical solution of the thermal problem is also presented for further validation of the temperature field as a constrained edge is approached.

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