Laser machining of ablating materials — Overlapped grooves and entrance/exit effects

Modest, Michael F.; Ramanathan, S.; Raiber, A.; Angstenberger, Birgit

doi:10.2351/1.5058802

Cited by 5 publications

(10 citation statements)

References 9 publications

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“…(2) • 85% indicated their laser processing work had increased over the past three years. • 85% foresee their laser processing work will increase over the next three years.…”

Section: The Projectmentioning

confidence: 99%

“…Due to its non-contact nature, laser processing provides excellent flexibility for interfacing with computer-aided design/computer-aided manufacturing (CAD/CAM) tools and allows precision machining without hard tooling and complex fixtures [1]. One of the principal advantages of laser processing is its ability to cut very hard metals and ceramics that are very difficult to machine using conventional techniques [2]. Lasers often provide a more cost-effective solution to conventional machining and have found widespread use in industries where precision tolerances must be held as well as the processing of exotic materials.…”

Section: Introductionmentioning

confidence: 99%

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The development of a laser machining curriculum: An interdisciplinary approach (the MAST program)

Masciadrelli

Massa

1997

Journal of Laser Applications

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The development of an industry-driven interdisciplinary curriculum in laser machining is presented. The Machine tool Advance Skills Technology (MAST) program is a US Department of Education grant to develop and demonstrate a national training model for new technologies and manufacturing processes in precision manufacturing. Springfield Technical Community College (STCC) in partnership with six other community colleges nationwide, developed, tested, and disseminated industry-specific skills standards and model curricula in laser machining and related technologies for the United States machine tool industry. STCC, with its strengths in laser and manufacturing engineering technologies, was selected to develop a true interdisciplinary program in laser machining by integrating key components from its laser electro-optics technology (LEOT) and mechanical engineering technology (MET) programs.

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“…(2) • 85% indicated their laser processing work had increased over the past three years. • 85% foresee their laser processing work will increase over the next three years.…”

Section: The Projectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The development of a laser machining curriculum: An interdisciplinary approach (the MAST program)

Masciadrelli

Massa

1997

Journal of Laser Applications

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“…Laser scribing of ablating and/or decomposing materials has been investigated primarily by Modest and coworkers. They developed a number of simple models for quasi-steady CW laser scribing, e.g., Modest and Abakians (1986) and Ramanathan and Modest (1990), as well as sophisticated 3-D models for CW as well as pulsed lasers, e.g., Roy and Modest (1993), Bang et al (1993), Modest (1995) and Modest et al (1994).…”

Section: Simple Cutting Models Have Been Developed Bymentioning

confidence: 99%

“…For simplicity, all non-dimensional parameters (except laser-on time t p,on ) were held constant at N k = 0:0427 Ste = 2.16, U = 3:185 = 0:9, and t p = 0:14. This corresponds to a laser with an average power of 600 W and a radius of w 0 = 147 m scanning over graphite at 6.5 cm/s, for which a comparison with experimental data was carried out in a previous paper [Modest et al (1994)]. Most laser machining operations on non-metals can be expected to have relatively similar sets of parameters.…”

Section: Illustrative Examplesmentioning

confidence: 99%

Transient Model for CW and Pulsed Laser Machining of Ablating/Decomposing Materials—Approximate Analysis

Modest

1996

Journal of Heat Transfer

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Approximate, quasi-one-dimensional conduction models have been developed to predict the changing shape of holes, single grooves, or overlapping grooves carved by ablation into a thick solid that is irradiated by a moving laser source. For CW or pulsed laser operation a simple integral method is presented, which predicts shapes and removal rates with an accuracy of a few percent, while requiring one order of magnitude less CPU time than a three-dimensional, numerical solution. For pulsed operation a “full-pulse” model is presented, computing the erosion from an entire pulse in a single step, and reducing computer time by another order of magnitude.

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“…Laser scribing of ablating and/or decomposing materials has been investigated primarily by Modest and coworkers. They developed a number of simple models for quasi-steady CW laser scribing, e.g., Modest and Abakians [12] and Ramanathan and Modest [13], as well as sophisticated 3-D models for CW as well as pulsed lasers, e.g., Roy and Modest [14], Bang et al [15], Modest [16] and Modest et al [17]. Finally, simple modeling of 3-D machining with a dual beam has been presented by Chryssoloris [18].…”

Section: Introductionmentioning

confidence: 99%

Laser machining of ablating/decomposing materials — Through cutting and drilling models

Modest¹

1996

International Congress on Applications of Lasers &Amp; Electro-Optics

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A previously-developed three-dimensional conduction model for scribing of a thick solid has been extended to predict the transient temperature distribution inside a finite thickness slab that is irradiated by a moving laser source, and the cutting rate and profile carved by evaporation of material. The laser may operate in CW or in pulsed mode (with arbitrary temporal intensity distribution) and may have an arbitrary spatial intensity profile. The governing equations are solved, for both constant and variable thermophysical properties, using a finite-difference method on a boundary-fitted coordinate system. Results for cutting rates and profiles, as well as for temperature fields, are presented for materials that ablate or decompose upon laser irradiation (without significant formation of liquid), for different material thicknesses, traverse speeds, pulsing conditions, and power levels. For drilling (zero traverse speed), a numerically much more efficient two-dimensional axisymmetric version of the model has also been implemented, and similar results for drilling behavior are presented as well.

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Laser machining of ablating materials — Overlapped grooves and entrance/exit effects

Cited by 5 publications

References 9 publications

The development of a laser machining curriculum: An interdisciplinary approach (the MAST program)

The development of a laser machining curriculum: An interdisciplinary approach (the MAST program)

Transient Model for CW and Pulsed Laser Machining of Ablating/Decomposing Materials—Approximate Analysis

Laser machining of ablating/decomposing materials — Through cutting and drilling models

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