Time scale effects in laser material removal: a review

Yao, Y. Lawrence; Chen, Hongqiang; Zhang, Wenwu

doi:10.1007/s00170-003-2026-y

Cited by 100 publications

(43 citation statements)

References 20 publications

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“…He has also shown that the variation in the power intensity results in considerable variation in the kerf size during the cutting, which is more pronounced at lower intensities. Zhang et al [5] have proposed a synthetic evaluation method for laser cutting quality. B S Yilbas et al [6] using a CO 2 laser with variable pulse frequency and Oxygen, as assisting gas, at different pressures have investigated the cutting process.…”

Section: ©Ijraset (Ugc Approved Journal): All Rights Are Reservedmentioning

confidence: 99%

Optimization of Co2 Laser Beam Cutting Process Parameters for Machining Of AISI 9255 Spring Steel

Sandeep¹

2017

IJRASET

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The present work deals with the process parameters optimization of continuous wave CO 2 laser cutting of AISI 9255 spring steel. In the present study four process variables such as laser power, cutting speed, laser pressure and focal distance are considered and experimentation are carried out based on L 27 orthogonal array (OA). The cut quality responses such as surface roughness and kerf taper are measured for every experimental run. To optimize process parameters TOPSIS method is employed. The aim of optimization is to minimize surface roughness and kerf taper characteristics.

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Section: ©Ijraset (Ugc Approved Journal): All Rights Are Reservedmentioning

confidence: 99%

Optimization of Co2 Laser Beam Cutting Process Parameters for Machining Of AISI 9255 Spring Steel

Sandeep¹

2017

IJRASET

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“…As shown in Fig. 7a, under the action of the focused laser beam, the molten material is removed immediately from the workpiece by assist gas, and a hole which diameter is larger than the diameter of focused beam is formed [21]. Figure 7b shows the movements of laser beam without load.…”

Section: Actual Efficiency Of the Laser Beammentioning

confidence: 99%

A new thin sheet heat source model for active gas melt laser cutting

Liu

Zhang

2014

Int J Adv Manuf Technol

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Because of tiny focal spot and the complex physical and chemical processes of active gas melt laser cutting, the actual efficiency of the laser beam, kerf width, periodic striation and the temperature field could not be simulated through previous heat source models. In this paper, a new thin sheet heat source model is presented to study the laser cutting process by finite element analysis. A series of experiments were also carried out to verify the predictions. Our results were obtained for thin (1.5 mm) type phase-hardened parts. A good correlation was found between simulation and experimental results. This new model can provide a theoretical basis for studying the active gas melt laser cutting of thin sheets.

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“…Previous studies regarding surface quality have mostly focused on the influence of the inherent properties of laser beams, such as pulse duration, pulse energy and wavelength [13][14][15]. However, laser processing conditions, especially the interactions and correlation between the machining parameters and the microstructural properties of the material, can also play an important role in laser ablation and, consequently, on the induced machining quality [16][17][18][19]. Hence, it is necessary to study and optimize the laser processing parameters in order to reduce the induced defects and to increase the integrity of the modified cemented carbide surfaces, especially for cases of repetitive, gradual ablation by laser beams at the same location.…”

Section: Introductionmentioning

confidence: 99%

Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size

et al. 2018

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Abstract:The ultra-short pulse laser has attracted attention as an advanced tool for functionalizing surface topography, since it has high accuracy and results in little damage. In a previous study, some innovative patterns were introduced on cemented carbide surfaces, such as dimples, which are commonly used as oil reservoirs for bearings. The accuracy is not only related to the inherent features of the laser, but also to the machining processes. Within this context, this study aims to investigate the influence of machining parameters (i.e., pulse number in this study) on the ablation mechanism and resulting surface integrity. Two cemented carbide grades, possessing similar chemical composition but different grain size (small and large), are machined using a femtosond laser set-up with variant pulse number (1-20). The geometrical properties of the produced structure and surface integrity are statistically investigated using different microscopy techniques. It is found that the dimple depth is approximately proportional to the pulse number for both grades, and the coarse grade leads to a higher rate of depth increase. Damage is found in the form of melting and cracking for the binder and the grains, respectively; but this is more pronounced for large-grain grade in terms of the scale and depth. However, these observations are only found at a very superficial position.

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Time scale effects in laser material removal: a review

Cited by 100 publications

References 20 publications

Optimization of Co2 Laser Beam Cutting Process Parameters for Machining Of AISI 9255 Spring Steel

Optimization of Co2 Laser Beam Cutting Process Parameters for Machining Of AISI 9255 Spring Steel

A new thin sheet heat source model for active gas melt laser cutting

Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size

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