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Metals
Special Issues
Thermally-Assisted and Mechanical Machining of Metals and Alloys
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Thermally-Assisted and Mechanical Machining of Metals and Alloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Additive Manufacturing".

Deadline for manuscript submissions: closed (28 February 2022) | Viewed by 6774

Special Issue Editors

Prof. Dr. Choonman Lee

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Guest Editor
Department of Mechanical Engineering, Changwon National University, Changwon 51140, Republic of Korea
Interests: manufacturing processes; precision machining; machine tools; laser-assisted machining; additive manufacturing
Dr. Dong-Hyeon Kim

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Guest Editor
Mechatronics Research Center, Changwon National University, Changwon 51140, Republic of Korea
Interests: laser-assisted machining; hybrid manufacturing processes; smart manufacturing; digital twin; machine tools

Special Issue Information

Dear Colleagues,

In industries, lasers are employed for a variety of material processing methods, including welding, surface hardening, rapid prototyping, and machining. Laser-assisted machining is an effective process to facilitate material removal processes for various materials, including difficult-to-cut materials. The laser heat source preheats the workpiece locally in front of the cutting tool before machining, and only the volume of material to be removed is effectively preheated.

In this Special Issue, we aim to collect a set of contributions in the referred fields, which include but are not limited to:

  • Laser-assisted machining: grinding, drilling, turning, milling, turn-mill process;
  • Material behavior and influence of thermal effect;
  • Optimization of process parameters;
  • Design and development of innovative equipment, tools, and systems;
  • Cutting tool wear, tool life, and a novel cutting tool design.

Research and review papers addressing all aspects of laser-assisted machining are welcome. Articles focusing on material processing, as well as design and development of equipment and cutting tools, are also encouraged.

We hope that the present Special Issue will be an opportunity to create a network between authors and other researchers working in the area of laser-assisted machining.

Prof. Dr. Choonman Lee
Dr. Dong-Hyeon Kim
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Laser-Assisted Machining
  • Laser-Based Hybrid Machining
  • Laser-Based Material Processing
  • Metals
  • Alloys
  • Composites
  • Ceramics
  • Difficult-to-Cut Materials
  • Material Behavior
  • Surface Integrity
  • Cutting Characteristics
  • Machining Performance
  • Process Parameters Optimization

Published Papers (3 papers)

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Research

14 pages, 5776 KiB  
Article
Productivity Enhancement of Aircraft Turbine Disk Using a Two-Step Strategy Based on Tool-Path Planning and NC-Code Optimization
by Wan-Sik Woo, David Curtis, Cristian Bagni, Choon-Man Lee, Joung-Hwan Lee and Dong-Hyeon Kim
Metals 2022, 12(4), 567; https://doi.org/10.3390/met12040567 - 27 Mar 2022
Cited by 1 | Viewed by 1852
Abstract
Most of the parts of an aircraft require the use of lightweight and high-strength materials. Since aircraft parts mainly use mechanical cutting processes, which are the most suitable material removal mechanism, to minimize changes in material properties, it is necessary to develop an [...] Read more.
Most of the parts of an aircraft require the use of lightweight and high-strength materials. Since aircraft parts mainly use mechanical cutting processes, which are the most suitable material removal mechanism, to minimize changes in material properties, it is necessary to develop an optimal cutting tool and cutting solution for each material. This work aims to enhance productivity and reduce the production cost of an aircraft turbine disk through designing a cutting strategy and optimizing the cutting conditions using a simulation approach. The number of tools was reduced from eight to six compared to the existing process conditions for semi-finishing and finishing of a turbine disk, and a new tool path was proposed through simulation. The cycle time was reduced by about 24%. NC-code optimization was performed through feed-rate optimization considering cutting force and chip thickness. As a result, cycle times were reduced by about 14%. Through tool-path optimization and NC-code optimization, it was confirmed that the total cycle time was reduced by about 54%, and tool wear was significantly improved. Full article
(This article belongs to the Special Issue Thermally-Assisted and Mechanical Machining of Metals and Alloys)
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13 pages, 3843 KiB  
Article
Investigation on the Thermal Effects of WC-Co Turning Inserts Deposited by Additive Manufacturing of Titanium Alloy Powder
by Joon-Koo Park, Choon-Man Lee and Dong-Hyeon Kim
Metals 2021, 11(11), 1705; https://doi.org/10.3390/met11111705 - 26 Oct 2021
Cited by 2 | Viewed by 1838
Abstract
Metal additive manufacturing (AM) has been one of the most useful processes in the manufacturing field. It has significant advantages in terms of the benefits of feature freedom and material waste reduction. These processes commonly use a heat source to fabricate a 3D [...] Read more.
Metal additive manufacturing (AM) has been one of the most useful processes in the manufacturing field. It has significant advantages in terms of the benefits of feature freedom and material waste reduction. These processes commonly use a heat source to fabricate a 3D shape through melting of a metal powder and subsequent solidification. The directed energy deposition method can stack the desired amount of material in the required location. This study addresses the thermal effects of a WC-Co cutting tool insert deposited by AM of titanium alloy powder in the turning process. First, the optimal deposition conditions were selected by conducting preliminary experiments. Second, titanium alloy powder was deposited on the turning insert under the selected conditions. Finally, verification evaluation was carried out in the turning process. The thermal effects of the turning insert with the titanium alloy were compared with an ordinary cutting tool insert. The average temperature of the cutting tool was reduced by 15% during operation. Full article
(This article belongs to the Special Issue Thermally-Assisted and Mechanical Machining of Metals and Alloys)
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15 pages, 5134 KiB  
Article
Experimental Investigation on Machinability of Titanium Alloy by Laser-Assisted End Milling
by Dong-Hyeon Kim and Choon-Man Lee
Metals 2021, 11(10), 1552; https://doi.org/10.3390/met11101552 - 29 Sep 2021
Cited by 22 | Viewed by 2426
Abstract
The Machining of titanium alloys is challenging because of their high strength, low thermal conductivity, high chemical reactivity, and high stresses at the cutting tool edges. Laser-assisted machining is an effective way to improve the machinability of titanium alloys. This paper presents an [...] Read more.
The Machining of titanium alloys is challenging because of their high strength, low thermal conductivity, high chemical reactivity, and high stresses at the cutting tool edges. Laser-assisted machining is an effective way to improve the machinability of titanium alloys. This paper presents an experimental investigation of the machinability of cutting force and surface roughness in laser-assisted end milling of titanium alloy Ti-6Al-4V. The absorptivity of Ti-6Al-4V was determined by conducting preheating experiments using a high-power diode laser with a wavelength of 940–980 nm. A thermal analysis was performed using the finite element method to predict temperature distribution. The depth of cut was determined where tensile strength decreased sharply, and the predicted surface temperature is presented in the analysis results. The experiments were performed with conventional machining and laser-assisted machining. Surface roughness, tool wear, and cutting force were evaluated. In contrast to the results of conventional end milling, laser-assisted end milling improved surface roughness. Moreover, laser-assisted end milling proved more effective than conventional end milling in terms of cutting tool damage. Our results proved that heat assistance significantly influenced the magnitude of the cutting forces—while the actual reduction in forces varied slightly depending on the force component, cutting tool, and cutting conditions, force components showed a reduction of roughly 13–46%. Full article
(This article belongs to the Special Issue Thermally-Assisted and Mechanical Machining of Metals and Alloys)
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