scholarly journals Improvement of Laser Beam Fusion Cutting of Mild and Stainless Steel Due to Longitudinal, Linear Beam Oscillation

2020 ◽  
Vol 10 (9) ◽  
pp. 3052
Author(s):  
Cindy Goppold ◽  
Thomas Pinder ◽  
Susanne Schulze ◽  
Patrick Herwig ◽  
Andrés Fabián Lasagni
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Energy Deposition ◽  
Cutting Speed ◽  
Beam Shaping ◽  
Recast Layer ◽  
Steel Plates ◽  
Cut Edge ◽  
Edge Quality ◽  
Beam Oscillation

The latest research on laser beam fusion cutting (LBFC) with static beam shaping have shown a limitation in the quality of cut parts for thick steel plates (> 6 mm) when using solid state lasers. The approach of dynamic beam oscillation has recently shown to be capable of overcoming this challenge, allowing to increase the cutting speed as well as improving cut edge quality beyond the state of the art. The present paper investigates the influence of longitudinal, linear beam oscillation in LBFC of 12 mm mild and stainless steel plates by analyzing different parameters as cutting speed, burr, surface roughness, heat affected zone (HAZ), and recast layer. Reasons for the observed process improvements compared to static beam shaping have been discussed. The adjustment of the energy deposition and interaction time of the laser beam with the material found to be most relevant for optimizing the LBFC process. In particular, for beam oscillation, a gradual energy deposition takes place and increases the interaction time. This reduces the heat input in terms of HAZ and recast layer by more than 50%, resulting in high cut edge quality and more than 70% faster cutting speed.

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

2021 ◽  
Vol 11 (3) ◽  
pp. 921
Author(s):  
Thomas Pinder ◽  
Cindy Goppold
Keyword(s):  
Heat Conduction ◽  
Laser Beam ◽  
Temperature Measurement ◽  
Energy Deposition ◽  
Process Zone ◽  
Oscillation Amplitude ◽  
Cutting Speed ◽  
Beam Shaping ◽  
Melt Pool Size ◽  
Beam Oscillation

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.

Off-Axial, Gas-Jet-Assisted, Laser Cutting of 6.35-mm Thick Stainless Steel

1995 ◽  
Vol 117 (2) ◽  
pp. 272-276 ◽  
Author(s):  
M. J. Hsu ◽  
P. A. Molian
Keyword(s):  
Stainless Steel ◽  
Laser Cutting ◽  
Gas Flow ◽  
Cutting Speed ◽  
Steel Plates ◽  
304 Stainless Steel ◽  
Gas Jet ◽  
Process Conditions ◽  
Cut Edge ◽  
Machining Rate

A dual gas-jet, laser-cutting technique involving coaxial and off-axial oxygen gas flows was developed to cut 6.35-mm thick AISI 304 stainless steel plates with a 1.2-kW CO2 gas transport laser at a cutting speed of 12.7 mm/sec (30 in./min). Under identical process conditions, the single, coaxial gas jet could not cut the stainless steel although the cutting speed was reduced to 2.11 mm/sec (5 in./min). Thresholds of off-axial nozzle diameter, gas-impinging angle, oxygen pressure, and other process parameters were determined to obtain clean-cut edge quality (average dross height 0.25 mm). Experimental data coupled with a fluid-dynamics model of gas flow were presented to show the effectiveness of the dual gas-jet, laser-cutting method in achieving the maximum machining rate without deteriorating the quality of cut.

Role of the Laser Focus Position in the Laser Beam Cutting of Thin Stainless Steel Sheets

2010 ◽  
Vol 659 ◽  
pp. 209-214
Author(s):  
György Meszlényi ◽  
János Dobránszky ◽  
Zolt Puskás
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Cutting Speed ◽  
Cutting Edge ◽  
Focus Position ◽  
Aisi 304L ◽  
Steel Sheets ◽  
Laser Focus ◽  
Edge Quality

This paper examines pulsed Nd:YAG laser cutting edge quality of 0,4 mm thin AISI 304L austenitic stainless steel sheets. We analyze the effect of laser beam focal plane distance from the upper plane of the sheet and the effect of cutting speed on the striation of the cutting edge. We obtain the acceptable focus position range from the analysis of percussion drilling. At the evaluation we determine the optimal focus position for the maximal cutting speed.

Improvement of cutting performance for thick stainless steel plates by step-like cutting speed increase in high-power fiber laser cutting

2018 ◽  
Vol 103 ◽  
pp. 311-317 ◽  
Author(s):  
Sangwoo Seon ◽  
Jae Sung Shin ◽  
Seong Yong Oh ◽  
Hyunmin Park ◽  
Chin-Man Chung ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Fiber Laser ◽  
High Power ◽  
Laser Cutting ◽  
Cutting Speed ◽  
Cutting Performance ◽  
Steel Plates ◽  
Speed Increase

Effect of Laser Beam Diameter on Cut Edge of Steel Plates Obtained by Laser Machining

2013 ◽  
Vol 467 ◽  
pp. 227-232 ◽  
Author(s):  
Imed Miraoui ◽  
Mouna Zaied ◽  
Mohamed Boujelbene
Keyword(s):  
Laser Beam ◽  
Laser Cutting ◽  
Steel Plates ◽  
Beam Diameter ◽  
Power Laser ◽  
Laser Beam Diameter ◽  
Machined Surface ◽  
Cut Edge ◽  
Thermal Influence ◽  
Cut Surface

Laser cutting is a thermal process which is used contactless to separate materials. In the present study, high-power laser cutting of steel plates is considered and the thermal influence of laser cutting on the cut edges is examined. The microstructure and the microhardness of the cut edge are affected by the input laser cutting parameter: laser beam diameter. The aim of this work is to investigate the effect of the laser beam diameter on the microhardness beneath the cut surface of steel plates obtained by CO2 laser cutting. The cut surface was studied based on microhardness depth profiles beneath the machined surface. The results show that laser cutting has a thermal effect on the surface microstructure and on the microhardness beneath the cut section. Also the microhardness of the hardening zone depends on the laser beam diameter.

scholarly journals Multi-objective optimization and analysis for laser beam cutting of stainless steel (SS304) using hybrid statistical tools GA-RSM

2021 ◽  
Vol 1201 (1) ◽  
pp. 012030
Author(s):  
A D Tura ◽  
H B Mamo ◽  
D G Desisa
Keyword(s):  
Genetic Algorithm ◽  
Surface Roughness ◽  
Stainless Steel ◽  
Laser Beam ◽  
Response Surface ◽  
Focal Point ◽  
Cutting Speed ◽  
Machining Parameters ◽  
Multi Objective ◽  
The Impact

Abstract A laser beam machine is a non-traditional manufacturing technique that uses thermal energy to cut nearly all types of materials. The quality of laser cutting is significantly affected by process parameters. The purpose of this study is to use a genetic algorithm (GA) in conjunction with response surface approaches to improve surface roughness in laser beam cutting CO2 with a continuous wave of SS 304 stainless steel. The effects of the machining parameters, such as cutting speed, nitrogen gas pressure, and focal point location, were investigated quantitatively and optimized. The tests were carried out using the Taguchi L9 orthogonal mesh approach. Analysis of variance, main effect plots, and 3D surface plots were used to evaluate the impact of cutting settings on surface roughness. A multi-objective genetic algorithm in MATLAB was used to achieve a minimum surface roughness of 0.93746 μm, with the input parameters being 2028.712 mm/m cutting speed, 11.389 bar nitrogen pressure, and a focal point position of - 2.499 mm. The optimum results of each method were compared, as the results the response surface approach is less promising than the genetic algorithm method.

scholarly journals Factorial Analysis of Fiber Laser Fusion Cutting of AISI 304 Stainless Steel: Evaluation of Effects on Process Performance, Kerf Geometry and Cut Edge Roughness

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2669
Author(s):  
Achim Mahrle ◽  
Madlen Borkmann ◽  
Peer Pfohl
Keyword(s):  
Stainless Steel ◽  
Focal Plane ◽  
Laser Power ◽  
Laser Cutting ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Cut Edge ◽  
Edge Roughness ◽  
Beam Oscillation

Factorial Design-of-Experiment analyses were applied for conventional and beam oscillation fiber laser cutting of 10 mm thick AISI 304 stainless steel. Considered factors in case of the conventional process with a static beam involve both laser and cutting gas parameters, in particular the laser power, the focal plane position, the cutting gas pressure, the nozzle stand-off distance as well as the nozzle diameter. The conducted trials were evaluated with respect to the achievable cutting speed, the cut kerf geometry and the cut edge roughness. Noticeable correlations between cut edge roughness and cut kerf geometry stimulated the development of a corresponding Computational Fluid Dynamics (CFD) model of the cutting gas flow through the kerf. A specific approach of data synchronization revealed that the experimentally determined roughness values do well correlate with numerically computed values of the backward directed component of the gas-induced shear stress and that the cut kerf geometry as internal process-inherent boundary condition influences relevant cutting characteristics more than controllable external cutting gas parameters. Finally, effects of circular beam oscillation were investigated by an additional factorial analysis considering the laser power, the focal plane position, the oscillation frequency and the oscillation amplitude as factors. The results demonstrate the potential of beam oscillation techniques for quality improvements in laser cutting.

Edelstahlschneiden*/Shear cutting of stainless steel

2015 ◽  
Vol 105 (10) ◽  
pp. 726-732
Author(s):  
D. Landgrebe ◽  
R. Müller ◽  
M. Kott
Keyword(s):  
Stainless Steel ◽  
Sheet Metal ◽  
Process Parameters ◽  
Stainless Steels ◽  
High Speed ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Parameter Study ◽  
Edge Quality ◽  
Metal Processing

Mit Einführung des Hochgeschwindigkeitsscherschneidens (HGSS) in die Blechbearbeitung rückt der Prozessparameter Schneidgeschwindigkeit zur Beeinflussung der Schnittkantenqualität in den Vordergrund. Aufgrund der bisher geringen industriellen Verbreitung des HGSS liegen nur wenig Erfahrungswerte für eine optimale Parameterauswahl vor. Der Fachaufsatz stellt die Ergebnisse einer systematischen Parameterstudie zum Scherschneiden von Edelstählen und deren Einordnung vor.   With the introduction of high-speed shear cutting (HSSC) in the field of sheet metal processing the process parameters „cutting speed“ and its for influence on the cutting edge quality has taken on a significant role. Due to the previously small industrial application of HSSC ther are correspondingly low experiences for optimicing cutting-parameters. This work presents the results of a systematic parameter study for shearing stainless steels and its resulting trends.

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