Towards optimization of beam mode for high efficiency laser thermal forming within metallurgical constraints

Griffiths, Jonathan David, Sheikholeslami, Ghazal, Clark, Samuel , Edwardson, Stuart and Dearden, Geoff (2014) Towards optimization of beam mode for high efficiency laser thermal forming within metallurgical constraints. In: International Workshop on Thermal Forming and Welding Distortion 2014, April 09-10, 2014, Bremen, Germany.

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Item Type:Conference or Workshop contribution (Paper)
Item Status:Live Archive

Abstract

In the laser forming (LF) process, laser induced temperature distribution within the work-piece is of paramount importance. Through control of process parameters and depending on work-piece geometry, the temperature distribution can be altered to achieve either localized plastic compressive strains or elastic-plastic buckling. Conventionally, three process parameters are manipulated in order to control the temperature distribution within the work-piece; traverse speed, average power and spot size. Additionally, the intensity distribution and geometrical shape of the beam incident on the work-piece surface can be manipulated. The latter has the potential to be useful in maintaining bend angle per pass whilst working within strict metallurgical constraints. In this paper, the effect of beam intensity distribution and geometrical shape on the LF of automotive grade high strength DP 1000 steel sheet is investigated numerically and experimentally, with particular emphasis on optimization for minimal micro-structural transformation.

Keywords:Laser forming (LF), Temperature gradient mechanism (TGM)
Subjects:F Physical Sciences > F361 Laser Physics
Divisions:College of Science > School of Engineering
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ID Code:13402
Deposited On:23 Feb 2014 18:17

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