Laser cutting optimization model with constraints: Maximization of material removal rate in CO<sub>2</sub> laser cutting of mild steel

Madić, Miloš; Mladenović, Srđan; Gostimirović, Marin; Radovanović, Miroslav; Janković, Predrag

doi:10.1177/0954405420911529

Cited by 30 publications

(14 citation statements)

References 43 publications

(62 reference statements)

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“…3 However, in laser cutting, the goal is either to achieve the minimal kerf width, because of material savings, or to achieve a pre-specified kerf width value since part programming would be simplified. 21…”

Section: Resultsmentioning

confidence: 99%

Analysis of process efficiency in laser fusion cutting and some single- and multi-objective optimization aspects

Madić

Gadallah

Petković

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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For an efficient use of laser cutting technology, it is of great importance to analyze the impact of process parameters on different performance indicators, such as cut quality criteria, productivity criteria, costs as well as environmental performance criteria (energy and resource efficiency). Having this in mind, this study presents the experimental results of CO2 laser fusion cutting of AISI 304 stainless steel using nitrogen, with the aim of developing a semi-empirical mathematical model for the estimation of process efficiency as an important indicator of the achievable energy transfer efficiency in the cutting process. The model was developed by relating the theoretical power needed to melt the volume per unit time and used laser power, where the change of kerf width was modeled using an empirical power model in terms of laser cutting parameters such as laser power, cutting speed, and focus position. The obtained results indicated the dominant effect of the focus position on the change in process efficiency, followed by the cutting speed and laser power. In addition, in order to maximize process efficiency and simultaneously ensure high cut quality without dross formation, a laser cutting optimization problem with constraints was formulated and solved. Also, a multi-objective optimization problem aimed at simultaneous optimization of process efficiency and material removal rate was formulated and solved, where the determined set of Pareto non-dominated solutions was analyzed by using the entropy method and multi-criteria decision analysis method, that is, the Technique for Order of Preference by Similarity to Ideal Solution. The optimization results revealed that in order to enhance process efficiency and material removal rate, while ensuring high cut quality without dross formation, focusing the laser beam deep into the bulk of material is needed with particular trade-offs between laser power and cutting speed levels at high pressure levels of nitrogen.

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Section: Resultsmentioning

confidence: 99%

Analysis of process efficiency in laser fusion cutting and some single- and multi-objective optimization aspects

Madić

Gadallah

Petković

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…where the laser fluence J equals to 3Qτ 0 /(πσ 2 ), and the non-dimensional form of the photo-thermal model for an ultrashort pulsed laser processing is shown in Equation (5). The coefficient of thermal diffusion term in the right-handed side of Equation ( 5) is τ0L, which represents the ratio of the ultrashort laser pulse duration of thermal diffusion time.…”

Section: Discussionmentioning

confidence: 99%

“…Lasers can be applied in many machinings of materials such as laser heat treatments [1], drilling [2], cutting [3][4][5], welding [6][7][8], hardening process [9], polished surfaces [10], nanometer-scaled processing [11], etc. The nanometer-scaled processing was generally achieved by an ultrashort pulsed laser.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Direct Optical Ablation and Sequent Thermal Ablation for the Ultrashort Pulsed Laser Photo-Thermal Micromachining

Xiong

Qiao

2020

Coatings

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An ultra-fast pulsed laser for materials processing can obtain submicrometer- to nanometer-sized parts or patterns (precision or accuracy) because the heat cannot diffuse in time for an ultra-fast pulsed duration, and this causes a threshold of ablation in multi-photoabsorption. The optical and thermal effects significantly affect the processing quality of an ultrashort pulsed laser for materials. This study utilizes a Laplace transform method to display the optical and thermal effects on the temperature field and the ablated depth of an ultrashort pulsed laser processing of materials. The results reveal that If an ultrafast pulsed laser-induced heat can keep the irradiated region above the evaporated temperature until the thermal diffusion occurs in the lattice of materials, thermal ablation occurs. The optical ablation can get a better processing quality due to less thermal diffusion. This study theoretically elucidates that the depth of optical ablation approximates the product of an optical absorption length and the logarithm of the ratio of laser fluence to laser fluence threshold. It has also been shown that the optical and thermal ablation, respectively, occur in low and high laser fluence because the optical ablation depends directly on the main source of the incident ultrashort pulsed laser. However, the thermal ablation is determined by the residual heat directly from the incident ultrashort pulsed laser after the optical ablation. The increase rate of the ablated depth per pulse with laser fluence is actually lower at high laser fluences than that at low laser fluences because the thermal ablation using the residual heat directly from the incident ultrashort pulsed laser is governed at high laser fluences. This study will provide the closed-form of a solution that elucidate the direct optical ablation and sequent thermal ablation for the ultra-fast pulsed laser photo-thermal processing.

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“…Madić et al have developed research on the possibilities of using gray relational analysis and a Taguchi's L27 experiment design in the case of an AISI 304 steel workpiece with a thickness of 3 mm [2]. In another paper, Madić et al have developed an optimization model with constraints, aiming to maximize the material removal rate in the case of CO2 laser cutting of mild steel [3].…”

Section: /1mentioning

confidence: 99%

Analysis of laser cut slots on different thickness steel plates

Olaru¹,

Coteaţă²,

Nagîț³

et al. 2021

Esaform 2021

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One of the processes used to separate parts from plate-type workpiece is laser beam cutting. The evaluation of the quality of the machined surfaces can be performed by taking into account the influence exerted by some input factors in the cutting process on the width of the slot and on the roughness of the surfaces generated by the laser beam cutting process. The paper presents the results of experimental research performed on a steel plate type workpiece. The objective pursued was to reveal the influence exerted by several input factors of the laser beam cutting process on some output parameters of this process. Empirical mathematical models corresponding to the output parameters taken into account were established. It was possible to order the input factors in the process by taking into consideration their weight in the values of the output parameters.

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Laser cutting optimization model with constraints: Maximization of material removal rate in CO₂ laser cutting of mild steel

Cited by 30 publications

References 43 publications

Analysis of process efficiency in laser fusion cutting and some single- and multi-objective optimization aspects

Analysis of process efficiency in laser fusion cutting and some single- and multi-objective optimization aspects

Analysis of Direct Optical Ablation and Sequent Thermal Ablation for the Ultrashort Pulsed Laser Photo-Thermal Micromachining

Analysis of laser cut slots on different thickness steel plates

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Laser cutting optimization model with constraints: Maximization of material removal rate in CO2 laser cutting of mild steel

Cited by 30 publications

References 43 publications

Analysis of process efficiency in laser fusion cutting and some single- and multi-objective optimization aspects

Analysis of process efficiency in laser fusion cutting and some single- and multi-objective optimization aspects

Analysis of Direct Optical Ablation and Sequent Thermal Ablation for the Ultrashort Pulsed Laser Photo-Thermal Micromachining

Analysis of laser cut slots on different thickness steel plates

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Laser cutting optimization model with constraints: Maximization of material removal rate in CO₂ laser cutting of mild steel