Model for thermodynamic point identification in laser cutting

Abstract

In recent years, laser cutting has been introduced and developed to such an extent that it is now thought to be one of the leading and indispensable manufacturing tools. At the present time, dross-free and accurately-cut parts are basically regarded as the major targets to aim for, because the costs and efforts associated with dross removal by postprocessing cut parts are considerable. Therefore, control of dross formation during laser cutting is an important factor in maintaining edge quality. The initial aim of this paper is to describe the importance of physico-mechanical material properties that need to be taken into account in modeling of laser material processing in order to control melting of the material.In den letzten Jahren wurde Laserschneiden eingeführt und soweit entwickelt, so dass es heute als ein führendes und unverzichtbares Herstellungsverfahren angesehen wird. Heutzutage werden schlackenfreie und passgenau zurechtgeschnittene Teile als das Hauptziel angesehen, da die Kosten zur Schlackenentfernung bei geschnittenen Teilen erheblich sind. Daher ist die Kontrolle der Schlackenbildung beim Laserschneiden ein wichtiger Faktor zum Erhalt der Kantenqualität. Das Ziel dieser Arbeit ist die Beschreibung der Bedeutung von physikalisch-mechanischen Materialeigenschaften, die bei der Modellierung der Laser-Materialbearbeitung berücksichtigt werden müssen, um das Schmelzen des Materials zu kontrollieren. Schlüsselwörter: Modell / Laserschneiden / thermodynamischer Punkt Corresponding author: M. Harnič árová,

Method of determination of enthalpy and entropy for the technology of laser cutting

“…The authors therefore created a new comprehensive analytical model and its algorithm . It was developed in such a manner that would be generally valid for all kinds of divided materials and would make it possible for designers to interactively calculate and optimise all important laser operating parameters.…”

Control of laser cutting by process timing

“…In comparison with the hydro‐abrasive division we have here a thermo‐dynamic exogenous process, which highly influences the division process. That is why the knowledge of thermo‐dynamic functions should be thoroughly taken into consideration already at designing and optimisation of technological parameters . Determination of the feed rate and rate of penetration, as well as corresponding timing of process functions, is much more complicated.…”