Laser cutting quality assessment and thermal efficiency analysis

Yilbaş, Bekir Sami

doi:10.1016/j.jmatprotec.2004.04.194

Cited by 88 publications

(54 citation statements)

References 24 publications

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“…This incident could be related to the interaction between the gas pressure and the focal point position, which will be discussed later. Also, the lower kerf decreases as the cutting speed increases this is in agreement with findings reported in [8]. Fig.…”

Section: Lower Kerfsupporting

confidence: 92%

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Effect of CO2 laser cutting process parameters on edge quality and operating cost of AISI316L

Eltawahni

Hagino

Benyounis

et al. 2012

Optics & Laser Technology

113

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Laser cutting is a popular manufacturing process utilized to cut various types of materials economically. The width of laser cut or kerf, quality of the cut edges and the operating cost are affected by laser power, cutting speed, assist gas pressure, nozzle diameter and focus point position as well as the work-piece material. In this paper CO 2 laser cutting of stainless steel of medical grade AISI316L has been investigated. Design of experiment (DOE) was implemented by applying Box-Behnken design to develop the experiment lay-out. The aim of this work is to relate the cutting edge quality parameters namely: upper kerf, lower kerf, the ratio between them, cut section roughness and operating cost to the process parameters mentioned above. Then, an overall optimization routine was applied to find out the optimal cutting setting that would enhance the quality or minimize the operating cost. Mathematical models were developed to determine the relationship between the process parameters and the edge quality features. Also, process parameters effects on the quality features have been defined. Finally, the optimal laser cutting conditions have been found at which the highest quality or minimum cost can be achieved.

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Section: Lower Kerfsupporting

confidence: 92%

“…It was found that the laser power has a highly significant effect on the kerf size. Yilbas [8] reported that increasing laser beam scanning speed reduces the kerf width, while the kerf width increases with increasing laser power. It was reported that the main effects of all the parameters employed have a significant influence on the cut quality.…”

mentioning

confidence: 99%

Effect of CO2 laser cutting process parameters on edge quality and operating cost of AISI316L

Eltawahni

Hagino

Benyounis

et al. 2012

Optics & Laser Technology

113

View full text Add to dashboard Cite

show abstract

“…Considerable physical complexity justifies the existence of the literature dedicated to empirical investigations of quality parameters. Techniques such as analysis of variances, [17][18][19][20] response surface method, [20][21][22][23] multiple regression analysis, 9,24,25 artificial neural networks, 9,[26][27][28] and genetic algorithms 22 have been used in these studies. Results are captured as polynomials that relate a single output parameter to a set of input parameters.…”

Section: Speed-power-pressure Conceptmentioning

confidence: 99%

“…Existing studies [7][8][9][10][11][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] do not consider the spatial characteristics of laser beams. Nevertheless, these are accounted for by the FPP, which is one of the key factors of the cutting process.…”

Section: Laser Beam Shape Position and Distortionmentioning

confidence: 99%

Gas-assisted laser cutting of medium-section metals using spherically aberrated beams

Yurevich

Grimm

Polyakov³

et al. 2015

Opt. Eng

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Abstract. We analyzed the effects of the focal point aberrational offset in optical transport systems for highpower lasers. Transverse and near-axial laser intensity distribution transformations in the presence of both positive and negative spherical aberrations were numerically calculated and experimentally demonstrated for different strengths. We show that spherical aberration yields considerable asymmetry of the focused beam's caustic. Several optical transport systems with identical optical parameters (excluding the noncorrected axial beam spherical aberration) were designed. We examined the effects of the laser intensity profiles produced by these systems on the quality of oxygen-assisted laser cutting of medium-section mild steel. We show that high-quality cuts can be obtained for different shapes of laser intensity distribution. However, the greater the refocusing magnitude introduced by the spherical aberration correction, the more precisely the focal point position must be maintained during the laser cutting process. © The Authors. Published by SPIE under a Creative Commons 1 Introduction Laser cutting of metals and alloys is one of the most commercially valuable laser technology processes. Originating from basic research on laser-matter interaction, 1 the field has significantly developed, now offering a large arsenal of state-of-the-art techniques.2-5 Omitting the energy and resource efficiency issues, 6 the performance of laser cutting can be captured by only two output parameters. These are the cutting speed and kerf quality. Thus, laser cutting optimization reduces to achieving the maximal cutting speed with the best kerf quality. As far as the material separation is concerned, 7 the speed can be dramatically increased. On the other hand, the cutting quality depends on many parameters. The most important and frequently discussed are the kerf geometry (accuracy, width, and taper), the surface quality (cut-edge roughness, striations morphology, and dross and burr inclusions), and the mechanical and metallurgical properties (hardness and strength, heat-affected zone, and oxide layer). 8 The number of parameters dramatically affecting the cutting quality ranges from 25 9 to 75. 4,5 These are nearly evenly divided between the workpiece properties, assist gas parameters, laser machine, and laser beam characteristics. Input-output parameters relationships are mostly nonlinear and exhibit strong interdependence. In this regard, maximal precision is provided by the studies that focus on only one input-output parameter pair. Yet, this "one parameter at one time" approach does not provide complete information on the process as a whole.

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“…S. Lee and D. Dornfeld investigated the material property changes and cutting kerf shape to develop an effective way of automated deburring of precision component (4) . B. Yilbas identified the influence of cutting parameters on the resulting cut quality based on factorial analysis (5,6) . P. Sheng and V. Joshi developed a numerical analysis for the HAZ (7) .…”

Section: Introductionmentioning

confidence: 99%

Study of Influence of Laser Cutting Sequence upon Thermal Deformation of a Base Sheet

Nunobiki

Okuda

Yoshida

2007

JAMDSM

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In case that a lot of products were cut out from a wide base sheet by laser cutting, the sheet had been much deformed so that the error occurred in a height regulator. This paper deals with thermal deformation of a base sheet caused by laser cutting. We clarified that the thermal deformation was influenced by the cutting sequence in the case of SUS304 sheets of 1mm thickness. The workpieces bent upward in inward sequence, and the workpieces bent downward in outward sequence. It was expected that the deformation was able to be controlled by cutting sequence.

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Laser cutting quality assessment and thermal efficiency analysis

Cited by 88 publications

References 24 publications

Effect of CO2 laser cutting process parameters on edge quality and operating cost of AISI316L

Effect of CO2 laser cutting process parameters on edge quality and operating cost of AISI316L

Gas-assisted laser cutting of medium-section metals using spherically aberrated beams

Study of Influence of Laser Cutting Sequence upon Thermal Deformation of a Base Sheet

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