FEM modeling and simulation of kerf formation in the nanosecond pulsed laser engraving process

Nikolidakis, Evangelos; Antoniadis, Aristomenis

doi:10.1016/j.cirpj.2021.06.014

Cited by 8 publications

(3 citation statements)

References 32 publications

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“…Beyond a certain number of scanning iterations, the sidewall taper angle stabilizes, reaching a minimum value of approximately 7°. Some studies have reported the occurrence of sidewall taper angles, which can be explained by fluence and damage threshold theory [12,13]. When the fluence of the laser energy exceeds the damage threshold FTh of the material, the surface will be damaged, and within a certain range, the greater this fluence, the greater the degree of damage.…”

Section: Resultsmentioning

confidence: 99%

Study on additive and subtractive manufacturing using picosecond laser micromachining

Zheng,

Trofimov,

Yang

et al. 2024

Laser + Photonics for Advanced Manufacturing

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Laser powder bed fusion (LPBF) can rapidly manufacture the metal products with complex structures, but the high surface roughness and low dimensional accuracy limit the mechanical properties and application scenarios of powder bed process parts. Because in recent years, the ultrafast laser micromachining has shown great potential in the field of precision machining, it was combined with laser powder bed manufacturing. It means that after additive manufacturing samples, those were micromachined using ultrafast laser. In current study, a laser powder bed fusion device, equipped with a picosecond laser, is described, and a preliminary realization of additive and subtractive manufacturing based on pulsed laser processing using this device is presented. The side surface roughness of the samples fabricated by hybrid additive manufacturing process was lower than that of samples built LPBF technology. This study may provide a new way to manufacture parts with high dimension accuracy and low surface roughness by LPBF technology.

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Section: Resultsmentioning

confidence: 99%

Study on additive and subtractive manufacturing using picosecond laser micromachining

Zheng,

Trofimov,

Yang

et al. 2024

Laser + Photonics for Advanced Manufacturing

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“…This is an inherited feature of the laser engraving process, which causes the side walls to deviate from the expected orthogonal direction and present an inclination. The formation of inclined sidewalls is ascribable to a series of factors that characterize the process, as the divergence of the laser beam [32], the overlap [33], and the gaussian beam profile [13]. This side-effect can be reduced by properly optimizing the process parameters [32] but cannot be completely eliminated unless optical components are used to vary the angle of incidence of the laser beam on the cavity walls [13].…”

Section: Femto-lasermentioning

confidence: 99%

Micro-Milling Process of Metals: A Comparison between Femtosecond Laser and EDM Techniques

Calabrese¹,

Azzolini²,

Bassi³

et al. 2021

JMMP

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Nowadays, micro-machining techniques are commonly used in several industrial fields, such as automotive, aerospace and medical. Different technologies are available, and the choice must be made considering many factors, such as the type of machining, the number of lots and the required accuracy specifications in terms of geometrical tolerances and surface finish. Lasers and electric discharge machining (EDM) are widely used to produce micro-components and are similarly unconventional thermal technologies. In general, a laser is particularly appreciated by the industry for the excellent machining speeds and for the possibility to machine essentially any type of materials. EDM, on the other hand, has a poor material removal rate (MRR) but can produce microparts on only electrically conductive workpieces, reaching high geometrical accuracy and realizing steep walls. The most common micro-application for both the technologies is drilling but they can make also milling operations. In this work, a comparison of femto-laser and EDM technologies was made focusing on micro-milling. Two features were selected to make the comparison: micro-channels and micro-pillars. The depth was varied on two levels for both features. As workpiece material, aluminum, stainless steel and titanium alloy were tested. Data regarding the process performance and the geometrical characteristics of the features were analyzed. The results obtained with the two technologies were compared. This work improves the knowledge of the micro-manufacturing processes and can help in the characterization of their capabilities.

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“…The temperature of the excited electrons sub-system is raised and subsequently the absorbed energy is transferred to the material's atomic lattice, causing it to heat up until its melting and/or ablation. The high energy densities that are employed during laser-based processes provide a number of significant advantages over the conventional machining that include the potential to create small and complex geometries with ultra-high precision, the reduction of the Heat Affected Zone (HAZ), and the deformations due to the thermal and mechanical stress concentration [3]. Laser engraving consists one of the most widely employed laser-based processes.…”

Section: Introductionmentioning

confidence: 99%

Surface topography investigation during nanosecond pulsed laser engraving of SAE304 stainless steel

Nikolidakis

2023

Materials Research Proceedings

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Abstract. Laser engraving process is widely used for various industrial applications, such as the creation of small and complex geometries with ultra-high precision. As surface topography can affect the functionality of produced surfaces in various ways, it is required to carry out comprehensive experimental work in order to correlate the laser engraving process parameters with surface topography characteristics. In the current paper, the surface topography of SAE304 stainless steel specimens in respect to laser power, scanning speed and pulse repetition rate is studied through microscope observations. The findings indicate that the scanning speed is the most dominant parameter regarding surface roughness and from the viewpoint of surface quality, it is suggested that higher scanning speed, lower power and pulse repetition rate values should be employed.

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FEM modeling and simulation of kerf formation in the nanosecond pulsed laser engraving process

Cited by 8 publications

References 32 publications

Study on additive and subtractive manufacturing using picosecond laser micromachining

Study on additive and subtractive manufacturing using picosecond laser micromachining

Micro-Milling Process of Metals: A Comparison between Femtosecond Laser and EDM Techniques

Surface topography investigation during nanosecond pulsed laser engraving of SAE304 stainless steel

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