Investigation on the melt ejection and burr formation during laser fusion cutting of stainless steel

2020 ◽  
Vol 32 (2) ◽  
pp. 022068 ◽  
Author(s):  
S. Stoyanov ◽  
D. Petring ◽  
D. Arntz-Schroeder ◽  
M. Günder ◽  
A. Gillner ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Burr Formation ◽  
Laser Fusion ◽  
Laser Fusion Cutting ◽  
Melt Ejection

Transient beam oscillation with a highly dynamic scanner for laser beam fusion cutting

2016 ◽  
Vol 5 (1) ◽  
Author(s):  
Cindy Goppold ◽  
Thomas Pinder ◽  
Patrick Herwig
Keyword(s):  
Stainless Steel ◽  
Fiber Laser ◽  
Focal Length ◽  
Quality Criteria ◽  
Cutting Parameters ◽  
Beam Shaping ◽  
Cutting Performance ◽  
Laser Fusion ◽  
Laser Fusion Cutting ◽  
Beam Oscillation

AbstractSheet metals with thicknesses >8 mm have a distinct cutting performance. The free choice of the optical configuration composed of fiber diameter, collimation, and focal length offers many opportunities to influence the static beam geometry. Previous analysis points out the limitations of this method in the thick section area. Within the present study, an experimental investigation of fiber laser fusion cutting of 12 mm stainless steel was performed by means of dynamical beam oscillation. Two standard optical setups are combined with a highly dynamic galvano-driven scanner that achieves frequencies up to 4 kHz. Dependencies of the scanner parameter, the optical circumstances, and the conventional cutting parameters are discussed. The aim is to characterize the capabilities and challenges of the dynamic beam shaping in comparison to the state-of-the-art static beam shaping. Thus, the trials are evaluated by quality criteria of the cut edge as surface roughness and burr height, the feed rate, and the cut kerf geometry. The investigation emphasizes promising procedural possibilities for improvements of the cutting performance in the case of fiber laser fusion cutting of thick stainless steel by means of the application of a highly dynamic scanner.

Analysis of process efficiency in laser fusion cutting and some single- and multi-objective optimization aspects

2021 ◽  
pp. 095440892110627
Author(s):  
Miloš Madić ◽  
Mohamed H Gadallah ◽  
Dušan Petković
Keyword(s):  
Laser Power ◽  
Laser Cutting ◽  
Optimization Problem ◽  
Removal Rate ◽  
Cutting Speed ◽  
Process Efficiency ◽  
Laser Fusion ◽  
Cut Quality ◽  
Dross Formation ◽  
Laser Fusion Cutting

For an efficient use of laser cutting technology, it is of great importance to analyze the impact of process parameters on different performance indicators, such as cut quality criteria, productivity criteria, costs as well as environmental performance criteria (energy and resource efficiency). Having this in mind, this study presents the experimental results of CO2 laser fusion cutting of AISI 304 stainless steel using nitrogen, with the aim of developing a semi-empirical mathematical model for the estimation of process efficiency as an important indicator of the achievable energy transfer efficiency in the cutting process. The model was developed by relating the theoretical power needed to melt the volume per unit time and used laser power, where the change of kerf width was modeled using an empirical power model in terms of laser cutting parameters such as laser power, cutting speed, and focus position. The obtained results indicated the dominant effect of the focus position on the change in process efficiency, followed by the cutting speed and laser power. In addition, in order to maximize process efficiency and simultaneously ensure high cut quality without dross formation, a laser cutting optimization problem with constraints was formulated and solved. Also, a multi-objective optimization problem aimed at simultaneous optimization of process efficiency and material removal rate was formulated and solved, where the determined set of Pareto non-dominated solutions was analyzed by using the entropy method and multi-criteria decision analysis method, that is, the Technique for Order of Preference by Similarity to Ideal Solution. The optimization results revealed that in order to enhance process efficiency and material removal rate, while ensuring high cut quality without dross formation, focusing the laser beam deep into the bulk of material is needed with particular trade-offs between laser power and cutting speed levels at high pressure levels of nitrogen.

scholarly journals Transition from Stable Laser Fusion Cutting Conditions to Incomplete Cutting Analysed with High-speed X-ray Imaging

2020 ◽  
Vol 60 ◽  
pp. 470-480
Author(s):  
Jannik Lind ◽  
Florian Fetzer ◽  
Christian Hagenlocher ◽  
David Blazquez-Sanchez ◽  
Rudolf Weber ◽  
...  
Keyword(s):  
High Speed ◽  
Cutting Conditions ◽  
Laser Fusion ◽  
X Ray ◽  
X Ray Imaging ◽  
Laser Fusion Cutting ◽  
Stable Laser

scholarly journals Investigation of Hydro-piercing Method for Stainless Steels by Finite Element Method

2018 ◽  
Vol 220 ◽  
pp. 01003
Author(s):  
Habip Gökay Korkmaz ◽  
Serkan Toros ◽  
Mehmet Halkaci ◽  
Hüseyin Selçuk Halkaci
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stainless Steel ◽  
Stainless Steels ◽  
Axial Symmetry ◽  
Damage Model ◽  
304 Stainless Steel ◽  
Burr Formation ◽  
Step Movement ◽  
Hydroforming Process

Researches and studies on hydroforming process, which is a method that is getting more and more popular every day thanks to its many advantages in application, are ongoing. It is possible to pierce- the holes on a tube or sheet hydroformed part using hydropiercing method after the forming operation. In this study, hydropiercing process of a 304 stainless steel is simulated via the LS-Dyna in 2D axial symmetry model. In the simulations two types of punch movement was investigated to determine the contribution to the burr formation. In the simulations, Jonson-Cook hardening and damage model were used to determine the initiation of the crack on the samples. As a result, the burr formation can be eliminated by the two step movement of the punch through the piercing operation.

Feasibility of Supercritical Carbon Dioxide Based Metalworking Fluids in Micromilling

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
S. D. Supekar ◽  
B. A. Gozen ◽  
B. Bediz ◽  
O. B. Ozdoganlar ◽  
S. J. Skerlos
Keyword(s):  
Carbon Dioxide ◽  
Surface Roughness ◽  
Stainless Steel ◽  
Supercritical Carbon Dioxide ◽  
Tool Wear ◽  
304 Stainless Steel ◽  
Metalworking Fluids ◽  
Burr Formation ◽  
Specific Cutting Energy ◽  
Cutting Energy

This article investigates the feasibility of using supercritical carbon dioxide based metalworking fluids (scCO2 metalworking fluids (MWFs)) to improve micromachinability of metals. Specifically, sets of channels were fabricated using micromilling on 304 stainless steel and 101 copper under varying machining conditions with and without scCO2 MWF. Burr formation, average specific cutting energy, surface roughness, and tool wear were analyzed and compared. Compared to dry machining, use of scCO2 MWF reduced burr formation in both materials, reduced surface roughness by up to 69% in 304 stainless steel and up to 33% in 101 copper, tool wear by up to 20% in 101 copper, and specific cutting energy by up to 87% in 304 stainless steel and up to 40% in 101 copper. The results demonstrate an improvement in micromachinability of the materials under consideration and motivate future investigations of scCO2 MWF-assisted micromachining to reveal underlying mechanisms of functionality, as well as to directly compare the performance of scCO2 MWF with alternative MWFs appropriate for micromachining.

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