A new method for the prediction of laser cut surface topography

Harničárová, Marta; Valíček, Ján; Kušnerová, Milena; Grznárik, Radovan; Petrů, Jana; Čepová, Lenka

doi:10.2478/v10048-012-0030-9

Cited by 15 publications

(12 citation statements)

References 14 publications

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“…The cited statements confirm the previous considerations and conclusions according to the authors [–]. The critical point of volume melting at a certain depth of the cut and the formation of the slag determine a cutting depth in the given material.…”

Section: Introductionsupporting

confidence: 88%

Model for thermodynamic point identification in laser cutting

Harničárová

Valíček

Grznárik

et al. 2014

Materialwissenschaft Werkst

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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,

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Section: Introductionsupporting

confidence: 88%

Model for thermodynamic point identification in laser cutting

Harničárová

Valíček

Grznárik

et al. 2014

Materialwissenschaft Werkst

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“…The depth of striation was increased in case of growing laser power and oxygen gas pressure, and the premature formation of dross on the cut surface was possible when the cutting speed and oxygen gas pressure was reduced. A topographic function as a basis for the prediction of quality and control of the laser cutting technology was developed in the paper [10]. The proposed model includes the direct influence of technology parameters such as material thickness, laser cutting speed, laser power, gas pressure and nozzle diameter on the roughness.…”

Section: Related Work and Motivationmentioning

confidence: 99%

Experimental investigations of the influence of laser beam and plasma arc cutting parameters on edge quality of high-strength low-alloy (HSLA) strips and plates

Klimpel

Cholewa

Bannister

et al. 2017

Int J Adv Manuf Technol

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The paper deals with experimental investigations of the influence of laser beam and plasma arc cutting parameters on edge quality of a range of steel grades and thicknesses. Based on the experimental results, a variety of methods have been taken to carry out the analysis of influence of laser beam and plasma arc cutting parameters on the quality and mechanical properties of cut edges of selected high-strength low-alloy (HSLA) strips and plates. In this study, three approaches were investigated corresponding to rank correlation analysis, multidimensional data analysis and decision trees. These techniques were able to elucidate the most relevant cutting parameters as well as the optimal field of values of these parameters to give the required geometrical and mechanical quality levels. As a result of this study, general rules in the form of cutting procedure specifications were established. This was needed to describe the relation between laser beam or plasma arc cutting parameters and the geometrical and mechanical quality factors of cut edges of different medium-and high-strength steel materials. The proposed rules can be also adopted for providing a comparison between the surface qualities achievable by the different combinations of cutting parameters for laser beam and plasma arc cutting processes of medium-and high-strength steels.

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“…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.…”

Section: Procedures Of Solutionmentioning

confidence: 99%

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

Harničárová

Valíček

Kušnerová

et al. 2016

Materialwissenschaft Werkst

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This paper is devoted to the mechanisms of laser cutting of material from the point of view of thermodynamics. Thanks to the special properties of a laser beam, lasers have proved to be a reliable tool for the industry. Scientific databases currently include many papers devoted to scientific and engineering research aimed at the development and application of the technology of lasers. Operating costs of a laser system are high when operated inefficiently, therefore efficient operation is quite desirable. High dimensional accuracy and mainly good final product quality must be achieved in order to ensure the effective laser cutting. Investigation into thermodynamic efficiencies and quality assessment of the final product in laser cutting is essential. We have created an analytical expression of the thermo-dynamic parameters of the cut. By expression of the entropy S, enthalpy H, heat flow density q and Gibbs' function of free energy G a complex image of thermo-dynamic conditions of the process was achieved. These are the basic thermodynamic parameters of the laser cutting of materials. All these factors under operating conditions had an impact on the surface quality of the cut, depth of the cut and also on the intensity of changes in the mechanical properties of the material, and last but not least, on productivity and competitiveness. This can be used both for predictions concerning the technology process, as well as for control of the process.

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A new method for the prediction of laser cut surface topography

Cited by 15 publications

References 14 publications

Model for thermodynamic point identification in laser cutting

Model for thermodynamic point identification in laser cutting

Experimental investigations of the influence of laser beam and plasma arc cutting parameters on edge quality of high-strength low-alloy (HSLA) strips and plates

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

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