Influence of cut front temperature profile on cutting process

Onuseit, Volkher; Jarwitz, Michael; Weber, Rudolf; Graf, Thomas

doi:10.2351/1.5062256

Cited by 4 publications

(5 citation statements)

References 5 publications

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“…The assumption is supported by Petring et al [6,7] who estimate the surface temperature of the cut front to be highest near the bottom. This is in strong agreement with the experiments of Onuseit et al [8,9] who measured line emissions of iron emitted from the surface of the cut front for the CO 2 laser cutting process. With increasing cutting velocity, they showed an increase of temperature up to boiling temperature of iron and that the temperature is highest near the bottom of the cut front.…”

Section: Introductionsupporting

confidence: 92%

“…In order to detect the emission lines of the stimulated iron vapor on top of the thermal radiation emitted from the interaction zone, the range for the spectral analysis was chosen to be 380 nm -730 nm. This spectral range includes emission lines of iron [8,9] and lies within the sensitivity range of the charge-coupled device (CCD) sensor. For all measurements the raw signal of each pixel was at least 10% of the maximum gray value (255 counts at 8 bit).…”

Section: Spectral Analysis Of Process Emissionsmentioning

confidence: 94%

“…Hot vapor of iron (Fe I) is known to emit characteristic lines in the spectral range between 500 nm and 550 nm [8,9]. The camera used to image the cutting front was therefore equipped with a bandpass filter transmitting in the range between 500 nm and 550 nm.…”

Section: Localization Of Flashes On the Cut Front By High-speed Imagingmentioning

confidence: 99%

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Local Vaporization at the Cut Front at High Laser Cutting Speeds

Bocksrocker

Berger

Keßler

et al. 2020

Lasers Manuf. Mater. Process.

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High-speed videos of the cut front and spectrometric measurements were applied to detect local vaporization on the cut front at high cutting speeds to show that with increasing feed rate, temporally short and intense flashes are generated by vaporization phenomena on the upper part of the cut front. The latter are accompanied by the emergence of an interrupted striation pattern on the surface of the cutting edge. The findings support the assumption that local vaporization at the cut front might be the cause for reduced quality of the cutting process at elevated cutting speeds. The observation of vaporization serves as a diagnostic method to anticipate a fail cut and the interrupted striation pattern.

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Section: Introductionsupporting

confidence: 92%

Section: Spectral Analysis Of Process Emissionsmentioning

confidence: 94%

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Local Vaporization at the Cut Front at High Laser Cutting Speeds

Bocksrocker

Berger

Keßler

et al. 2020

Lasers Manuf. Mater. Process.

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“…An important result is the strong correlation between the temperature distribution of the process zone and the cut edge quality [26]. Consequently, further measurement setups have been developed to directly address the temperature of the melt film [34][35][36][37][38][39]. The direct temperature measurement differs from the indirect one by a calibration.…”

Section: Measurement Methods To Determine the Limiting Mechanisms Of ...mentioning

confidence: 99%

“…A sufficient spatial resolution ensures a differentiation of various temperature regions in the process zone. All of the examined direct temperature measurement setups achieve spatial resolution of the complete processing zone just by repositioning of the sensor [34][35][36][37][38][39]. Camera-based measurement setups performed particularly well, as they provide a sufficient temporal resolution in addition [26,38].…”

Section: Measurement Methods To Determine the Limiting Mechanisms Of ...mentioning

confidence: 99%

Understanding the Changed Mechanisms of Laser Beam Fusion Cutting by Applying Beam Oscillation, Based on Thermographic Analysis

Pinder

Goppold

2021

Applied Sciences

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The latest research on applying beam oscillation in laser beam fusion cutting revealed significant process improvements regarding speed and quality. The reason for this increasing process efficiency remains unexplained; however, theoretical investigations suggest the change in energy deposition (respectively heat conduction) as the cause. The present paper aims to analyze the energy deposition by a novel temperature measurement method. For this purpose, a conventional laser beam cutting setup was equipped with beam oscillation technology and a high-speed temperature measurement setup. Various characteristics of the temperature distribution in the process zone (spatial and temporal resolved temperature profiles, maximum and average values, as well as melt pool size) were evaluated for different conditions of beam oscillation (amplitude, frequency, cutting speed). Additionally, the geometrical properties of the process zone, defining the absorptivity have been measured. The comparison with static beam shaping reveals strong temperature volatility, which is induced by the way of energy deposition and an improved absorptivity over a substantial part of the cut front, with the overall result of enhanced heat conduction. For the first time, changed mechanisms applying beam oscillation instead of static beam shaping have been experimentally identified. Based on these measurements, a previously developed explanatory model was not only confirmed but also extended.

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