Laser forming of a bowl shaped surface with a stationary laser beam

2016 ◽  
Vol 77 ◽  
pp. 126-136 ◽  
Author(s):  
Shitanshu Shekhar Chakraborty ◽  
Harshit More ◽  
Ashish Kumar Nath
Keyword(s):  
Laser Beam ◽  
Laser Forming ◽  
Shaped Surface

Affected Characteristics Analysis of the Pulsed Laser Forming of Metal Sheet

2008 ◽  
Vol 375-376 ◽  
pp. 333-337
Author(s):  
Li Jun Yang ◽  
Yang Wang
Keyword(s):  
Laser Beam ◽  
Pulsed Laser ◽  
Metal Sheet ◽  
Grain Structure ◽  
Experimental Result ◽  
Laser Forming ◽  
Forming Process ◽  
Grain Orientations ◽  
Characteristics Analysis ◽  
Relationship Of

Laser forming of metal sheet is a forming technology of sheet without a die that the sheet is deformed by internal thermal stress induced by partially irradiation of a laser beam. In this paper, the bending behavior of common stainless steel 1Cr18Ni9 sheet is studied after being irradiated by straight line with a Nd:YAG pulsed laser beam. The aim of the investigation is to find out the relationship of the physical behaviors of heat affected zone (HAZ) with the pulse parameters of the laser. Through the analysis of the fundamental theory of pulsed laser affected, this paper shows the affected characteristics of metal sheet with pulsed laser forming. The results show that the microstructure of HAZ of pulsed laser scanned is layered, and the micro-hardness is improved than that in matrix. The microstructures show that the deformed grain structure is inhomogeneous, that caused the grain sizes and grain orientations in HAZ to become different. By qualitative analysis of experimental result, the conclusion obtained may provide basis for theoretical investigation and possible industrial application of laser forming process in the future.

Parameters influence of laser forming on shaped surface by soft computing technique

Optik ◽  
2017 ◽  
Vol 142 ◽  
pp. 451-454 ◽  
Author(s):  
Srđan Jović ◽  
Slobodan Makragić ◽  
Milivoje Jovanović
Keyword(s):  
Soft Computing ◽  
Laser Forming ◽  
Computing Technique ◽  
Shaped Surface ◽  
Soft Computing Technique

Parametric study on bending and thickening in laser forming of a bowl shaped surface

2012 ◽  
Vol 50 (11) ◽  
pp. 1548-1558 ◽  
Author(s):  
Shitanshu Shekhar Chakraborty ◽  
Vikranth Racherla ◽  
Ashish Kumar Nath
Keyword(s):  
Parametric Study ◽  
Laser Forming ◽  
Shaped Surface

scholarly journals Consideration of Absorption Coefficient Changes in Numerical Simulations of Laser Forming

2019 ◽  
Vol 44 (1) ◽  
pp. 1-5
Author(s):  
Helge Kügler ◽  
Frank Vollertsen
Keyword(s):  
Absorption Coefficient ◽  
Laser Beam ◽  
Numerical Simulations ◽  
Surface Oxidation ◽  
Laser Beams ◽  
Laser Forming ◽  
Beam Forming ◽  
Work Piece ◽  
Solid State Lasers ◽  
Co2 Lasers

Material processing with laser beams is well-known in nowadays production. Compared to CO2 lasers, modern solid state lasers are, amongst others, popular because of higher energy efficiency and higher absorption when metals like steel and aluminum are irradiated. However, the absorption of metals is not only dependent on the chemical composition of the work piece metal and the laser beam wavelength. Previous investigations determined the oxidation of the surface as an influence on laser beam absorption changes due to multiple irradiation. In this study, a method is presented for considering the absorption coefficient changes caused by surface oxidation in numerical simulations. Reproductions of single trajectories were assigned with appropriate absorption coefficients calculated from a function generated by reference tryouts. With the described approach, benefits are gained for numerical simulations of laser beam forming (like bending) and other processes with an iterative heat input.

An Experimental Study on Bending Process of AISI 304 Steel Sheets by using Diode Laser Forming

2014 ◽  
Vol 1 (1) ◽  
pp. 14-30
Author(s):  
Alfonso Paoletti
Keyword(s):  
Laser Beam ◽  
Diode Laser ◽  
Process Parameters ◽  
Laser Forming ◽  
Laser Bending ◽  
Aisi 304 ◽  
Steel Sheets ◽  
Metal Sheets ◽  
Bending Process ◽  
Aisi 304 Steel

Laser bending is a promising technique utilised in order to deform metal sheets that offers the advantage of requiring no hard tooling and no external forces, thus reducing cost and increasing flexibility. Laser forming involves a complex interaction of many process parameters, ranging from those connected with the irradiation of the laser beam to those regarding the thermal and mechanical properties of the workpiece material. The present work is focused on the laser bending of AISI 304 steel sheets by using of a diode laser. The influence of process parameters, such as the power of laser beam and the scanning speed as well as the metal sheet thickness on the bending angle has been taken into account. The investigation has also analysed the effect of rolling direction of the metal sheets and the conditions of cooling on the bending process.

Curved Surfaces Forming of Sheet Material by Laser Irradiation

2014 ◽  
Vol 1017 ◽  
pp. 788-793
Author(s):  
Keisuke Kishida ◽  
Hideki Aoyama ◽  
Naohisa Mastushita ◽  
Akihiko Ushimaru
Keyword(s):  
Laser Beam ◽  
Laser Irradiation ◽  
Degrees Of Freedom ◽  
Sheet Material ◽  
Fem Analysis ◽  
Laser Forming ◽  
Curved Surfaces ◽  
Line Energy ◽  
Forming Technology ◽  
Curvature Lines

Laser forming is a technology which can form sheet material such as steel and plastic by irradiating a laser beam on the surfaces of material. In the forming, it does not need costly dies and molds, and forming degrees of freedom are high. However, since the forming mechanisms are complex, complete forming technology for practical use has not been developed. The objectives of this paper are to explain phenomena of laser forming by experiments and FEM analysis and to develop a forming method of curved surfaces by laser forming. The phenomena are explained by the temperature change, stress change, and plastic strain change at a laser irradiation point which was obtained by FEM analysis. Line energy is proposed for explanation of laser forming phenomena to classify the forming mechanisms, and a method is proposed in order to form curved surfaces of sheet material by irradiating a laser beam on maximum and minimum curvature lines. The effectiveness of the method was verified by a basic experiment.

Laser Beam Forming: Experimental Investigation and Statistical Analysis of the Effects of Parameters on Bending Angle

2013 ◽  
Author(s):  
Stephen Akinlabi ◽  
Mukul Shukla ◽  
Tshilidzi Marwala
Keyword(s):  
Laser Beam ◽  
Process Parameters ◽  
Manufacturing Process ◽  
Steel Plate ◽  
Cooling Effect ◽  
Laser Forming ◽  
Maximum Effect ◽  
Beam Forming ◽  
Bending Angle ◽  
Bending Angles

Laser Beam Forming (LBF), a non-contact manufacturing process has become a viable manufacturing process for shaping of metallic components. The capability of LBF and bending demands more on experimental studies to identify optimized parameter settings and also establish the probable influence of process parameters on the response i.e. the resulting bending angles in the present work. The experiments on laser forming process of 3 mm steel plate were conducted using a 4.4 kW Nd: YAG laser (Rofin DY 044), at the Council for Science and Industrial Research - National Laser Centre (CSIR-NLC), Pretoria, South Africa. This paper investigates the effects of five important process parameters such as namely laser power, beam diameter, number of scan tracks, scan velocity and cooling effect on the resulting formed sample curvature. Statistical tools combined with the Taguchi robust Design of Experiment, based on the L-27 Taguchi Orthogonal array (TOA) have been used. The samples were successfully formed to different curvatures following the experimental design. Both the Taguchi analysis and Analysis of Variance (ANOVA) established that the number of scan irradiation had the maximum effect while cooling effect coolant flow had the least contribution on the bending angle of formed components. Regression analysis was also conducted on the experimental data and a linear model relating all the influencing parameters was developed with an R-square value of around 98% showing the goodness of fit of the model. The regression model confirms that the experimentally measured bending angles were in good agreement with the model predicted values. This model can ultimately be used to estimate the bending angle in LBF of 3 mm steel plate within the study range of parameters.

The Effect of Nonconventional Laser Beam Geometries on Stress Distribution and Distortions in Laser Bending of Tubes

2006 ◽  
Vol 129 (3) ◽  
pp. 592-600 ◽  
Author(s):  
Shakeel Safdar ◽  
Lin Li ◽  
M. A. Sheikh ◽  
Zhu Liu
Keyword(s):  
Laser Beam ◽  
Laser Scanning ◽  
Thermal Stresses ◽  
Laser Forming ◽  
Beam Diameter ◽  
Hydraulic Systems ◽  
Tube Bending ◽  
Laser Bending ◽  
Scanning Velocity ◽  
Laser Tube

Laser forming is a spring-back-free noncontact forming method that has received considerable attention in recent years. Compared to mechanical bending, no hard tooling, dies, or external force is used. Within laser forming, tube bending is an important industrial activity with applications in critical engineering systems such as heat exchangers, hydraulic systems, boilers, etc. Laser tube bending utilizes the thermal stresses generated during laser scanning to achieve the desired bends. The parameters varied to control the process are usually laser power, beam diameter, scanning velocity, and the number of scans. The thermal stresses generated during laser scanning are strongly dependent upon laser beam geometry. The existing laser bending methods use either circular or rectangular beams. These beam geometries sometimes lead to undesirable effects such as buckling and distortion in tube bending. This paper investigates the effects for various laser beam geometries on laser tube bending. Finite element modeling has been used for the study of the process with some results also validated by experiments.

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