Statistical analysis of parameter effects on bending angle in laser forming process by pulsed Nd:YAG laser

2011 ◽  
Vol 43 (3) ◽  
pp. 475-482 ◽  
Author(s):  
M. Hoseinpour Gollo ◽  
S.M. Mahdavian ◽  
H. Moslemi Naeini
Keyword(s):  
Statistical Analysis ◽  
Nd:Yag Laser ◽  
Laser Forming ◽  
Forming Process ◽  
Bending Angle ◽  
Pulsed Nd:Yag Laser

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.

On the bending angle of aluminum-copper two-layer sheets in laser forming process

2021 ◽  
Vol 142 ◽  
pp. 107233
Author(s):  
Reza Masoudi Nejad ◽  
Zohreh Sadat Hoseini Shojaati ◽  
Greg Wheatley ◽  
Danial Ghahremani Moghadam
Keyword(s):  
Laser Forming ◽  
Forming Process ◽  
Bending 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.

Temperature Gradient-Based Laser Bending of Full Plates and Plates With Cutout

2020 ◽  
pp. 270-305
Author(s):  
Paramasivan Kalvettukaran ◽  
Sandip Das ◽  
Sundar Marimuthu ◽  
Dipten Misra
Keyword(s):  
Laser Forming ◽  
Forming Process ◽  
Laser Bending ◽  
Bending Angle ◽  
Aisi 304 ◽  
Thermally Induced ◽  
Bending Process ◽  
Gradient Based ◽  
Different Dimensions ◽  
Different Shapes

The laser bending process, also called the laser forming process, consists of irradiating the surface of a sheet or a plate by means of a moving laser beam with a predefined scanning strategy to generate the desired shape through thermally induced residual stress. This chapter presents the mechanisms of a laser bending process and the technological aspects concerning laser v-bending of rectangular AISI 304 plates for full plates and plates with a central cutout at its middle to highlight the process fundamentals and how processing affects the final bending angle of the workpieces. Laser bending involving plates with a cutout will have numerous applications for car bodies, such as front and rear panels where bending is required to be performed on panels with cutout geometries. To investigate the effects of shape and size of the cutout on temperature distribution, stress distribution, and final bending angle, different shapes such as circular, ellipse, rectangular, and square, as well as different dimensions of cutouts have been chosen.

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.

Bending Angle Estimated Based on Inherent Strain Theory during Laser Forming

2010 ◽  
Vol 663-665 ◽  
pp. 947-951
Author(s):  
Jing Zhou ◽  
Hong Shen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Strain Theory ◽  
Laser Forming ◽  
Elastic Analysis ◽  
Forming Process ◽  
Bending Angle ◽  
Forming Mechanism ◽  
Inherent Strain ◽  
Element Method

Laser forming process analyzed under thermo-elasto-plastic finite element method can better understand the forming mechanism. However, it is very time consuming. This paper introduced the prediction of the deformation in laser forming based on the theory of inherent strain by finite element method (FEM). The relations between inherent strains and laser forming parameters based on some experimental curves and the thermo-elasto-plastic analysis can be determined, in which the inherent strains are assumed to be distributed in a rectangle shape. This method is much more convenient because only elastic analysis is involved. The effectiveness of the proposed method is demonstrated through the comparison with the experimental data.

Sign in / Sign up

Export Citation Format

Share Document