NUMERICAL SIMULATION OF METAL DRILLING WITH A CO2 LASER BEAM

A numerical code that simulates the initiation and evolution of a crater in a metal plate exposed to a focused CO 2 laser beam has been developed. The code treats a time-dependent, three-dimensional axisymmetric heat conduction problem in a workpiece with temperature-dependent properties that underg...

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Bibliographic Details
Published in:Numerical heat transfer. Part B, Fundamentals Fundamentals, 1991-01, Vol.19 (1), p.85-104
Main Authors: Armon, E., Zvirin, Y., Solan, A.
Format: Article
Language:English
Online Access:Get full text
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Summary:A numerical code that simulates the initiation and evolution of a crater in a metal plate exposed to a focused CO 2 laser beam has been developed. The code treats a time-dependent, three-dimensional axisymmetric heat conduction problem in a workpiece with temperature-dependent properties that undergoes two phase transitions. The boundary conditions depend on the surface temperature, orientation, and recession speed, while the solution domain changes continuously as a result of material removal. Discretization is by the control volume approach. Simple one-dimensional cases that demonstrate the "positive feedback" nature of the problem are simulated and compared with analytical solutions. Thus the proper discretization requirements are evaluated in terms of the grid "gradient number" and the grid "speed number" Convergence of the simulations for a typical exposure of an aluminum plate is also presented.
ISSN:1040-7790
1521-0626
DOI:10.1080/10407799108944958