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Journal articles on the topic 'Laser assisted turning'

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Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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1

Wu, Xue Feng, Hong Zhi Zhang, and Yang Wang. "Laser Assisted Turning of Sintered Silicon Nitride." Key Engineering Materials 458 (December 2010): 113–18. http://dx.doi.org/10.4028/www.scientific.net/kem.458.113.

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Laser assisted turning is an effective method machining difficult-to-machine materials such as ceramics, which uses a high power laser to focally heat a workpiece prior to material removal with a traditional cutting tool. A transient, three-dimensional heat transfer model was developed for laser assisted turning of silicon nitride using Finite Element Method to understand the thermal process of laser heating and to optimize the operating parameters. A laser assisted turning experiment system was set up to investigate the thermal conditions and cutting process of laser assisted turning of sintered silicon nitride and the experiments were conducted on the system using selected parameters. Effects of cutting parameters on cutting forces and specific cutting energy were investigated. Forces on the chip and SEM micrographs of chip morphology were studied to discuss the material removal mechanism of laser assisted turning of silicon nitride. Tool wear, surface roughness of the machined surface and the quality of subsurface were investigated. The results showed that the heat transfer model could be used to optimize the cutting parameters and laser assisted turning method could increase the machining efficiency while maintaining machining quality and reasonable levels of tool wear. A method of optimizing LAM based on the thermal model was presented.
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2

Arrizubieta, J. I., F. Klocke, S. Gräfe, K. Arntz, and A. Lamikiz. "Thermal Simulation of Laser-assisted Turning." Procedia Engineering 132 (2015): 639–46. http://dx.doi.org/10.1016/j.proeng.2015.12.542.

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3

Habrat, Witold F. "Experimental Investigation of Effect of the Laser-Assisted Finish Turning of Ti-6Al-4V Alloy on Machinability Indicators." Solid State Phenomena 261 (August 2017): 135–42. http://dx.doi.org/10.4028/www.scientific.net/ssp.261.135.

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In this paper, the experimental studies of the finish turning of Ti-6Al-4V titanium alloy with the laser-assisted machining were described. For the tests, a cemented carbide tool was used. The influence of the laser heating on the microstructure of Ti-6Al-4V titanium alloy for kinematics corresponding with the turning process was determined. For a laser scanning rate of 80 m/min and laser power 1200W, the maximum depth of the melted zone was about 50 μm. The beneficial effect of laser assisted machining on components of the cutting force was established. For a cutting speed of 80 m/min, feed rate 0.1 mm/rev, depth of cut 0.25 mm and laser power 1200 W, over 60% reduction of the tangential components of cutting force was observed. The chip-breaking effect for the conventional and the laser-assisted processes was determined. Roughness parameters of the surface after the conventional and laser-assisted turning are compared.
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4

Chwalczuk, Tadeusz, Paweł Lisiak, Piotr Siwak, Damian Przestacki, and Piotr Szablewski. "Laser assisted turning of Inconel 718 alloy." Mechanik, no. 8-9 (September 2016): 1118–19. http://dx.doi.org/10.17814/mechanik.2016.8-9.276.

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5

Chwalczuk, Tadeusz, Damian Przestacki, Piotr Szablewski, and Agata Felusiak. "Microstructure characterisation of Inconel 718 after laser assisted turning." MATEC Web of Conferences 188 (2018): 02004. http://dx.doi.org/10.1051/matecconf/201818802004.

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The paper presents the discussion about the possibility of optimising heating and cutting parameters for turning under laser assisted machining (LAM) conditions. The samples of Inconel 718 after annealing and ageing were used. The laser heating experiments were carried out on the stand equipped with the CO2 molecular laser. Characterisation of samples was performed by an optical microscope, hardness measurements, scanning electron microscopy (SEM) to ensure the exact depth of heat affect zone range and to optimised further cutting parameters. Different absorbing layers for laser beam impact improvement were tested. Turning trials were performed with constant cutting speed vc = 28 m/min and feed f = 0,2 mm/rev. The influence of depth of cut ap on microstructure and its properties were investigated. It was proven that for sequential LAM dendritic structure appears in the laser affected zone of the Ni-based alloy. Such microstructures cause better machinability of Inconel 718 due to surface softening.
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6

Bejjani, R., B. Shi, H. Attia, and M. Balazinski. "Laser assisted turning of Titanium Metal Matrix Composite." CIRP Annals 60, no. 1 (2011): 61–64. http://dx.doi.org/10.1016/j.cirp.2011.03.086.

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7

Warap, N. M., Zazuli Mohid, and Erween Abdul Rahim. "Laser Assisted Machining of Titanium Alloys." Materials Science Forum 763 (July 2013): 91–106. http://dx.doi.org/10.4028/www.scientific.net/msf.763.91.

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Laser assisted machining is categorized in preheat machining process. The laser beam used to heat up work materials is very flexible in providing a localized heat area. However the combination between two processes which has totally different fundamental has contributed to complex processing characteristics. In the case of hard to machined metal processing, problems in surface integrity and accuracy are frequently arise. Tool ware and work material properties changes are some of the issue that drove engineers and researchers to seek for optimized processing parameters. This chapter introduces resent finding in research done on laser assisted machining (LAM). Focus is given on laser assisted mechanical machining consist of laser assisted milling (LAM) and laser assisted turning (LAT).
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8

Zhao, Fu, William Z. Bernstein, Gautam Naik, and Gary J. Cheng. "Environmental assessment of laser assisted manufacturing: case studies on laser shock peening and laser assisted turning." Journal of Cleaner Production 18, no. 13 (September 2010): 1311–19. http://dx.doi.org/10.1016/j.jclepro.2010.04.019.

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9

Felusiak, Agata, Tadeusz Chwalczuk, and Martyna Wiciak. "Surface Roughness Characterization of Inconel 718 after Laser Assisted Turning." MATEC Web of Conferences 237 (2018): 01004. http://dx.doi.org/10.1051/matecconf/201823701004.

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This paper describes the surface roughness parameters evaluation of Inconel 718 (43 HRC) after turning under laser assisted conditions. The experiment was conducted for cemented carbides inserts under various cutting and laser heating parameters. Tesets based on central composite research program allows to describe an interaction between input (cutting speed vc, laser power P, feed f) and output (roughness parameters according to PN-ISO 4288: Ra, Rz, Rt, Rsk, RSm, Rdq) parameters. The results showed that laser power density decrease values of amplitude type of roughness parameters. Such occurrence is not observed for horizonal and hybrid parameters of surface. The function is not described by monotonic projection. Therefore optimization by usability function was performed to observe complex interaction between input and output values. The findings of this work define which one of values from cutting speed, laser power and feed values have crucial impact on surface roughness constitution.
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10

Nasr, Mohamed N. A., Mohamed Balbaa, and Hassan Elgamal. "Modelling Machining-Induced Residual Stresses after Laser-Assisted Turning of Steels." Advanced Materials Research 996 (August 2014): 622–27. http://dx.doi.org/10.4028/www.scientific.net/amr.996.622.

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The current study examines the effects of laser assistance on machining-induced residual stresses (RS), using finite element modelling, during turning of steels. Dry orthogonal cutting was modelled, along with the pre-heating effect of the laser beam. AISI 4340 steel was used in the current work. Laser-assisted machining (LAM) resulted in higher surface tensile RS compared to conventional machining, with more pronounced effects at lower feed rates. This is basically because the assisted material experienced higher plastic deformation, due to thermal softening, as well as higher temperatures, which are both attributed to the pre-heating effect of LAM.
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11

Wiciak, Martyna, Tadeusz Chwalczuk, and Agata Felusiak. "Experimental Investigation and Performance Analysis of Ceramic Inserts in Laser Assisted Turning of Waspaloy." MATEC Web of Conferences 237 (2018): 01003. http://dx.doi.org/10.1051/matecconf/201823701003.

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In this paper, the influence of laser assisted turning of hard-to-cut nickel-based superalloy on tool cutting ability was presented. The conducted research involved the machining performance along with tool life of ceramic inserts during turning of heat-resistant alloy under a trade name Waspaloy. The ceramic insert with geometry in accordance with the ISO – RPGX 120700 T01020 were applied during longitudinal turning with laser beam. The investigations has been completed with various cutting conditions such as laser power P, cutting speed vc, feed f and depth of cut ap. In order to determine the relations between the tool wear and cutting time, the tool life T has been selected. The increment of tool wear was correlated with the change of vibration signals and the critic points of tool wear was presented. In addition, the shape and form of chip was evaluated based on macroscopic observation and SEM analyses. The conducted research was primarily focused on effective application of ceramic inserts during turning Waspaloy with laser beam and comparison this technology with conventional machining.
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12

Szymański, Michał, and Mateusz Kukliński. "Geometrical structure of surface after turning of 316L stainless steel in laser assisted conditions." Archives of Mechanical Technology and Materials 39, no. 1 (January 1, 2019): 66–73. http://dx.doi.org/10.2478/amtm-2019-0012.

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Abstract The effects of turning 316L steel in a laser assisted machining are presented in this paper. The properties of 316L stainless steel are also shown in this article. In order to show correlation between the technological parameters, microgeometry of cutting tools and geometrical structure of surface, turning of material in grade 316L supported by laser has been executed. In addition, optical examination of cutting inserts has been performed and geometrical measurements of machined surfaces have been taken. The results of researches on the effects of the technological parameters and cutting tool’s microgeometry on the geometrical structure of the 316L steel surface after turning in LAM conditions are described.
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13

You, Kaiyuan, Fengzhou Fang, and Guangpeng Yan. "Surface generation of tungsten carbide in laser-assisted diamond turning." International Journal of Machine Tools and Manufacture 168 (September 2021): 103770. http://dx.doi.org/10.1016/j.ijmachtools.2021.103770.

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14

Deswal, Neeraj, and Ravi Kant. "Machinability Analysis During Laser Assisted Turning of Aluminium 3003 Alloy." Lasers in Manufacturing and Materials Processing 9, no. 1 (January 17, 2022): 56–71. http://dx.doi.org/10.1007/s40516-022-00163-9.

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15

You, Kaiyuan, and Fengzhou Fang. "High effective laser assisted diamond turning of binderless tungsten carbide." Journal of Materials Processing Technology 302 (April 2022): 117505. http://dx.doi.org/10.1016/j.jmatprotec.2022.117505.

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16

Abdulghani, Omar, Mohamed Sobih, Amro Youssef, and Abdel-Monem El-Batahgy. "Modeling and Simulation of Laser Assisted Turning of Hard Steels." Modeling and Numerical Simulation of Material Science 03, no. 04 (2013): 106–13. http://dx.doi.org/10.4236/mnsms.2013.34014.

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17

Kim, Kwang-Sun, Jae-Hyun Kim, Jun-Young Choi, and Choon-Man Lee. "A review on research and development of laser assisted turning." International Journal of Precision Engineering and Manufacturing 12, no. 4 (August 2011): 753–59. http://dx.doi.org/10.1007/s12541-011-0100-1.

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18

Kashani, Mostafa M., Mohammad R. Movahhedy, Mohammad T. Ahmadian, and Reza S. Razavi. "In-process determination of laser beam absorption coefficient for laser-assisted turning processes." International Journal of Advanced Manufacturing Technology 92, no. 5-8 (April 13, 2017): 2929–38. http://dx.doi.org/10.1007/s00170-017-0326-x.

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19

Wei, Yuan, Chaneel Park, and Simon S. Park. "Experimental Evaluation of Direct Laser Assisted Turning through a Sapphire Tool." Procedia Manufacturing 10 (2017): 546–56. http://dx.doi.org/10.1016/j.promfg.2017.07.044.

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20

Mohammadi, Hossein, Deepak Ravindra, Sai K. Kode, and John A. Patten. "Experimental work on micro laser-assisted diamond turning of silicon (111)." Journal of Manufacturing Processes 19 (August 2015): 125–28. http://dx.doi.org/10.1016/j.jmapro.2015.06.007.

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21

Kim, Jongsu, and Bongchul Kang. "Machining characteristics of micro lens mold in laser-assisted micro-turning." Journal of Mechanical Science and Technology 32, no. 4 (April 2018): 1769–74. http://dx.doi.org/10.1007/s12206-018-0333-3.

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22

H., BAKER, YOSSEF F., KHOAIL M., and MOUGHITH M. "THE INFLUENCE OF LASER ASSISTED TURNING PARAMETERS ON CUTTING FORCES-NEW APPROACH." International Conference on Applied Mechanics and Mechanical Engineering 12, no. 12 (May 1, 2006): 229–38. http://dx.doi.org/10.21608/amme.2006.42641.

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23

Kieruj, Piotr, and Mateusz Kuklinski. "Tool life of diamond inserts after laser assisted turning of cemented carbides." MATEC Web of Conferences 121 (2017): 03011. http://dx.doi.org/10.1051/matecconf/201712103011.

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24

Zhai, Changtai, Jinkai Xu, Yiquan Li, Yonggang Hou, Shuaishuai Yuan, Qimeng Liu, and Xu Wang. "The study on surface integrity on laser-assisted turning of SiCp/2024Al." International Journal of Optomechatronics 14, no. 1 (January 1, 2020): 29–43. http://dx.doi.org/10.1080/15599612.2020.1789251.

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25

Dumitrescu, P., P. Koshy, J. Stenekes, and M. A. Elbestawi. "High-power diode laser assisted hard turning of AISI D2 tool steel." International Journal of Machine Tools and Manufacture 46, no. 15 (December 2006): 2009–16. http://dx.doi.org/10.1016/j.ijmachtools.2006.01.005.

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26

Choi, Jun Young, and Choon Man Lee. "Evaluation of Cutting Force and Surface Temperature for Round and Square Member in Laser Assisted Turn-Mill." Applied Mechanics and Materials 229-231 (November 2012): 718–22. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.718.

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LAT (Laser Assisted Turning) is an effective machining method for difficult to cut materials. Especially, because of the characteristics of a significant reduction in machining costs and flexibility in its machining, the applications of LAT have been largely extended to various machining fields. However, Studies on LAT are still staying at the beginning of research and represent a limitation in which a LAT process was applied to round members only. According to increases in customized production of special purpose parts, the researches on LAT for clover or polygon section members are necessary. In this paper, a LATM (laser assisted turn-mill) process was proposed to complement LAT.
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27

You, Kaiyuan, Fengzhou Fang, Guangpeng Yan, and Yue Zhang. "Experimental Investigation on Laser Assisted Diamond Turning of Binderless Tungsten Carbide by In-Process Heating." Micromachines 11, no. 12 (December 14, 2020): 1104. http://dx.doi.org/10.3390/mi11121104.

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Binderless tungsten carbide (WC) finds widespread applications in precision glass molding (PGM). Grinding and polishing are the main processes to realize optical surface finish on binderless WC mold inserts. The laser assisted turning (LAT) by in-process heating is an efficient method to enhance the machinability of hard and brittle materials. In this paper, laser heating temperature was pre-calculated by the finite element analysis, and was utilized to facilitate laser power selection. The effects of rake angle, depth of cut, feed rate, and laser power are studied experimentally using the Taguchi method. The variance, range, and signal-to-noise ratio analysis methods are employed to evaluate the effects of the factors on the surface roughness. Based on the self-developed LAT system, binderless WC mold inserts with mirror finished surfaces are machined using the optimal parameters. PGM experiments of molding glass lenses for practical application are conducted to verify the machined mold inserts quality. The experiment results indicate that both the mold inserts and molded lenses with the required quality are achieved.
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28

Kim, Jae-hyun, Kwang-sun Kim, Jun-young Choi, and Choon-man Lee. "Estimation of deformed laser heat sources and thermal analysis on laser assisted turning of square member." Journal of Central South University 19, no. 2 (January 28, 2012): 402–7. http://dx.doi.org/10.1007/s11771-012-1018-1.

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29

Hu, Yizhong, Jianbing Meng, Zhenwei Hu, Haian Zhou, Xiaosheng Luan, Bingqi Huang, and Xiuting Wei. "Machining characteristics of Ti6Al4V alloy turning assisted by laser heating and ultrasonic atomization." Applied Optics 60, no. 9 (March 15, 2021): 2583. http://dx.doi.org/10.1364/ao.418023.

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30

Attia, H., S. Tavakoli, R. Vargas, and V. Thomson. "Laser-assisted high-speed finish turning of superalloy Inconel 718 under dry conditions." CIRP Annals 59, no. 1 (2010): 83–88. http://dx.doi.org/10.1016/j.cirp.2010.03.093.

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31

Kohail, A. "Evaluation of tool wear behavior when laser assisted turning of die steel using Nd:Yag pulsed laser (Dept.M)." MEJ. Mansoura Engineering Journal 33, no. 1 (December 1, 2020): 1–8. http://dx.doi.org/10.21608/bfemu.2020.126822.

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32

Bodlapati, Charan, Di Kang, Jayesh Navare, Robert Turnbull, Yuxiang Zhong, and Hossein Shahinian. "Cutting performance of laser assisted diamond turning of calcium fluoride with different crystal orientations." Applied Optics 60, no. 9 (March 12, 2021): 2465. http://dx.doi.org/10.1364/ao.415265.

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33

youssef, Amro, Ahmed Kohail, and Mohamed Bakir. "Investigation of the parameters influencing pulsed laser assisted turning of DIN. 1.2379 tool steel." Journal of Engineering Science and Military Technologies 4, no. 1 (March 1, 2020): 162–70. http://dx.doi.org/10.21608/ejmtc.2020.49727.1158.

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34

Lee, Choon-Man, and Eun Jung Kim. "A Study on the Machining Characteristics of a Turning-Center by Laser Assisted Machining." Journal of the Korean Society for Precision Engineering 35, no. 6 (June 1, 2018): 597–601. http://dx.doi.org/10.7736/kspe.2018.35.6.597.

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35

Przestacki, D., P. Szymanski, and S. Wojciechowski. "Formation of surface layer in metal matrix composite A359/20SiCP during laser assisted turning." Composites Part A: Applied Science and Manufacturing 91 (December 2016): 370–79. http://dx.doi.org/10.1016/j.compositesa.2016.10.026.

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36

Hao, Xiuqing, Hao Yan, Jinjin Han, Chenjiao Yao, and Ning He. "Experimental research on pulse laser assisted micro turning of ZrO2 ceramic." International Journal of Nanomanufacturing 14, no. 2 (2018): 165. http://dx.doi.org/10.1504/ijnm.2018.091582.

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37

He, Ning, Jinjin Han, Chenjiao Yao, Xiuqing Hao, and Hao Yan. "Experimental research on pulse laser assisted micro turning of ZrO2 ceramic." International Journal of Nanomanufacturing 14, no. 2 (2018): 165. http://dx.doi.org/10.1504/ijnm.2018.10012676.

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38

Khatir, Farzad Ahmadi, Mohammad Hossein Sadeghi, and Samet Akar. "Investigation of surface integrity in the laser-assisted turning of AISI 4340 hardened steel." Journal of Manufacturing Processes 61 (January 2021): 173–89. http://dx.doi.org/10.1016/j.jmapro.2020.09.073.

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39

Prasad, Balla Srinivasa, Javvadi Umamaheswara Rao, and A. Gopala Krishna. "Analysis of vibration signals to quantify displacement amplitude in the monitoring of vibration-assisted turning." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 233, no. 1 (November 9, 2017): 35–47. http://dx.doi.org/10.1177/0954408917742196.

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Vibration-assisted machining combines precision machining with small-amplitude tool vibration at high frequency to improve the fabrication process. It has been applied to a number of processes from turning to drilling to grinding. This work presents the validation of tool condition monitoring system based on vibration parameters. For this purpose, an experimental investigation is planned to acquire vibration signal data during the machining. This work primarily focuses on quantifying the presence of relative vibrations between the cutting tool and a workpiece during vibration-assisted turning process which helps in predicting tool life. For this purpose, an online acoustic optic emission-based vibration transducer, i.e. Laser Doppler Vibrometer, is used as a component of a novel approach. Cutting force and vibration signals were recorded and analyzed. Machine dynamic effects such as cutting force and tool wear are taken into account during the dry machining of Ti-6Al-4V alloys specimens. Identifying the correlation among tool wear, cutting forces and displacement due to vibration is a critical task in the present study. Real-time experimental findings are used to predict the evolution of displacement and tool wear in the experiment. Efficacy of a logical relationship among the process variables such as displacement, feed rate, spindle rotational speed, and depth of cut is critically examined. Results of the present study are used to establish a strategy for real-time efficient tool monitoring systems for vibration-assisted turning operation. The wear mechanisms of DNMA 432 coated carbide and uncoated carbide insert tools were examined at different combinations of feed rate, spindle speed, and depth of cut for turning of Ti-6Al-4V workpiece material.
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40

Gorin, Alexander, and M. Mohan Reddy. "Advanced Ceramics: Some Challenges and Solutions in Machining by Conventional Methods." Applied Mechanics and Materials 624 (August 2014): 42–47. http://dx.doi.org/10.4028/www.scientific.net/amm.624.42.

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The lecture discusses various machining methods of advanced ceramics, their performances and limitations. These methods include both conventional turning, grinding and milling operations and some selected from the category of non-traditional machining processes like electrical discharge machining, laser assisted milling, abrasive water jet and other are presented as well. Special consideration is given to machinable glass ceramic and aluminum nitride ceramic representing structural ceramics due to their wide range of applications and attractive properties
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41

Bose, P. S. C., N. Selvaraj, and Chakala Naresh. "RSM-based optimisation of machining forces and surface roughness when laser-assisted turning Nitinol alloy." International Journal of Materials and Product Technology 1, no. 1 (2022): 1. http://dx.doi.org/10.1504/ijmpt.2022.10050444.

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42

You, Kaiyuan, Guangyu Liu, and Fengzhou Fang. "Investigation of surface integrity on laser pre-heat assisted diamond turning of binderless tungsten carbide." Procedia CIRP 108 (2022): 566–70. http://dx.doi.org/10.1016/j.procir.2022.03.089.

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43

Attia, M. Helmi, Philip Mark Joseph, and Rachid M’Saoubi. "Determination of convective heat transfer from rotating workpieces in dry and laser-assisted turning processes." Advances in Materials and Processing Technologies 2, no. 2 (April 2, 2016): 324–38. http://dx.doi.org/10.1080/2374068x.2016.1184048.

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44

Tran, Trung Huynh, Quynh Le Diem Nguyen, Thao Thi Do, Khue Nhut Truong, Quang Vinh Dang, and Man Thi Ngoc Bui. "Evaluation of Carbon Dioxide Laser–Assisted Treatment for Gingival Melanin Hyperpigmentation." Dentistry Journal 10, no. 12 (December 13, 2022): 238. http://dx.doi.org/10.3390/dj10120238.

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Background: Smile aesthetics has a vital role to play in an individual’s life and one of the factors affecting the beauty of the smile is gingival color. A gingival color change or gingival hyperpigmentation causes an unesthetic smile line, especially in patients with a gummy smile, which is also known as a black gummy smile. Numerous gingival depigmentation methods have been performed successfully for ablating gingival melanin pigmented epithelium. Thus, the aim of this study is to evaluate the treatment efficacy of gingival hyperpigmentation by using a carbon dioxide (CO2) laser. Methods: A cross-sectional descriptive study was carried out with 38 patients at a hospital in Vietnam. Ponnaiyan classification and the Hedin melanin index were used to assess the distribution and extent of gingival pigmentation in the study. Pain assessment was performed using the Visual Analog Scale (VAS) to evaluate the intensity of pain during the laser treatment. In addition, clinical evaluation (i.e., wound healing) of each treatment procedure was conducted using the three level Dummett–Gupta Oral Pigmentation Index (DOPI) assessment. Results: This study showed that less pain was experienced by patients treated by CO2 laser; the rates of no pain, mild pain and moderate pain after treatment were, respectively, 21%, 76% and 2.6%; there was 100% complete epithelization after 1 week. The DOPI rates for turning from a DOPI score of 1, 2 or 3 to a DOPI score of 0 after a 12-week treatment were 87.5%, 76.9% and 24%, respectively. Conclusions: Using a CO2 laser for gingival melanin pigmentation treatment is a safe and effective procedure.
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45

Vignesh, M., K. Venkatesan, R. Ramanujam, and P. Kuppan. "A Parametric Optimization on Cutting Force during Laser Assisted Machining of Inconel 718 Alloy." Applied Mechanics and Materials 787 (August 2015): 460–64. http://dx.doi.org/10.4028/www.scientific.net/amm.787.460.

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Inconel 718, a nickel based alloys, addressed as difficult to cut material because of hard carbide particle, hardness, work hardening and low thermal conductivity. Improving the machinability characteristics of nickel based alloys is a major anxiety in aircraft, space vehicle and other manufacturing fields. This paper presents an experimental investigation in Laser assisted turning of Inconel 718 to determine the effects of laser cutting parameters on cutting temperature and cutting forces. This nickel alloy has a material hardness at 48 HRC and machined with TICN/Al2O3/TiN tool. This is employed for the manufacture of helicopter rotor blades and cryogenic storage tanks. The experiments were conducted at One-Factor-at-a-Time.The effects of laser cutting parameters, namely cutting speed, feed rate, laser power and laser to work piece angle, on the cutting temperature and cutting force components, are critically analysed and the results are compared with unassisted machining of this alloy. The experiments are conducted by varying the cutting speed at three levels (50, 75, 100 m/min), feed rate (0.05, 0.075 0.1 mm/rev), laser power (1.25 kW, 1.5 kW, 1.75 kW) and at two level laser to work piece angle (60, 75°). At the optimal parametric combinationof laser power 1.5 kW with cutting speed of 75m/min, feed rate of 0.075 mm/min and laser to work piece angle 60°, the benefit of LAM was shown by 18%, 25% and 24% decrease in feed force (Fx), thrust force (Fy) and cutting force (Fz) as compared to those of the conventional machining. Examination of the machined surface hardness profiles showed no change under LAM and conventional machining.
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46

Nurul Amin, A. K. M., Muammer Din Arif, Noor Hawa B. Mohamad Rasdi, Khairus Syakirah B. Mahmud, Abdul Hakam B. Ibrahim, Mohd Firdaus B. Zawani, and Amir Faris B. Abdul Malik. "Identification of Optimum Heating Temperature in Thermal Assisted Turning of Stainless Steel Using Three Different Approaches." Applied Mechanics and Materials 393 (September 2013): 194–99. http://dx.doi.org/10.4028/www.scientific.net/amm.393.194.

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Thermal or heat assisted machining is used to machine hard and difficult-to-machine materials such as Inconel and Titanium alloys. The main concept is that localized surface heating of the work-piece reduces the yield strength of the material significantly, making it amenable to plastic deformation and machining. Thus, heat assisted machining has been used for over a century. However, the heating technique and temperature are very much dependent on the type of working material. Therefore, a multitude of heating techniques has been applied over the years including Laser Assisted Machining (LAM) and Plasma Enhanced Machining (PEM) in the industry. But such processes are very expensive and have not been found in wide scale applications. The authors of the current research have therefore looked into the application of a simple Tungsten Inert Gas (TIG) welding setup to perform heat assisted turning of AISI 304 Stainless Steel. Such welding equipment is relatively cheap and available. Also, stainless steel is perennially used in the industry for high strength applications. Hence, it is very important to determine with optimal cutting temperature when applying a TIG setup for heat assisted machining of stainless steel. This paper describes three separate techniques for determining the optimum temperature. All three processes applied the same experimental setup but used different variables for evaluating the best temperature. The first process used vibration amplitude reduction with increment in temperature to identify the desired temperature. The second process used chip shrinkage coefficient to locate the same temperature. And finally, the third process investigated tool wear as a criterion for determining the optimum temperature. In all three cases the three primary cutting parameters: cutting speed, feed, and depth of cut, were varied in the same pattern. The results obtained from all three approaches showed that 450oC was undoubtedly the best temperature for heat assisted machining of stainless steel.
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47

Mohammadi, Hossein, H. Bogac Poyraz, Deepak Ravindra, and John A. Patten. "An Experimental Study on Single Point Diamond Turning of an Unpolished Silicon Wafer via Micro-Laser Assisted Machining." Advanced Materials Research 1017 (September 2014): 175–80. http://dx.doi.org/10.4028/www.scientific.net/amr.1017.175.

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Single Pointe Diamond Turning (SPDT) of silicon can be an extremely abrasive process due to the hardness of this material. In this research SPDT is coupled with the micro-laser assisted machining (μ-LAM) technique to machine an unpolished single crystal silicon (Si) wafer. Si is increasingly being used for industrial applications as it is hard, strong, inert, light weight and has great optical and electrical properties. Manufacturing this material without causing surface and subsurface damage is extremely challenging due to its high hardness, brittle characteristics and poor machinability. However, ductile regime machining of Si is possible due to the high pressure phase transformation (HPPT) occurring in the material caused by the high compressive and shear stresses induced by the single point diamond tool tip. The μ-LAM system is used to preferentially heat and thermally soften the workpiece material in contact with a diamond cutting tool. Different outputs such as surface roughness (Ra, Rz) and depth of cuts (DoC) for different set of experiments with and without laser were analyzed. Results show that an unpolished surface of a Si wafer can be machined in two passes to get a very good surface finish.
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He, Wenbin, Chuangting Lin, Tung-An Wu, Xian Tang, Xiao Chen, and Jianfeng Xu. "An improved beetle antennae search algorithm with Lévy flight and its application in micro-laser assisted turning." Advanced Engineering Informatics 54 (October 2022): 101732. http://dx.doi.org/10.1016/j.aei.2022.101732.

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Sultan, F. Abdullah, and R. Panneer. "Improving Machinability in Conventional Turning of Ti-6Al-4V Using Work Piece Pre-Heating with Standard Cutting Tools." Applied Mechanics and Materials 813-814 (November 2015): 347–51. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.347.

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Machining hard to machine materials using conventional method of machining has proved to be very costly as these materials greatly affect the tool life because of poor machinability. One material that requires considerable study is Titanium which is a relatively lightweight material and provides excellent mechanical properties. The major problems in machining Titanium Alloys are the high cutting temperatures and rapid tool wear. Machining of Titanium using techniques like Laser Assisted Machining and Plasma Assisted Machining have proven to give high productivity rates, but the costs associated are very high. The main objective of this work is to develop a method for improving the machinability of Ti-6Al-4V using Work Piece Pre-Heating technique by using Conventional Machining with standard tools. Design of experiments was performed using Taguchi’s robust design. The machining operation was performed at elevated temperatures using oxy-acetylene flame. The tools used are Coated and Uncoated Carbide Tools. Based on the tool wear values obtained with different cutting conditions, it is concluded that this technique is feasible with the coated and uncoated carbide tools to machine titanium components commercially.
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Escaich, Cécile, Zhongde Shi, Luc Baron, and Marek Balazinski. "Machining of Titanium Metal Matrix Composites: Progress Overview." Materials 13, no. 21 (November 6, 2020): 5011. http://dx.doi.org/10.3390/ma13215011.

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The TiC particles in titanium metal matrix composites (TiMMCs) make them difficult to machine. As a specific MMC, it is legitimate to wonder if the cutting mechanisms of TiMMCs are the same as or similar to those of MMCs. For this purpose, the tool wear mechanisms for turning, milling, and grinding are reviewed in this paper and compared with those for other MMCs. In addition, the chip formation and morphology, the material removal mechanism and surface quality are discussed for the different machining processes and examined thoroughly. Comparisons of the machining mechanisms between the TiMMCs and MMCs indicate that the findings for other MMCs should not be taken for granted for TiMMCs for the machining processes reviewed. The increase in cutting speed leads to a decrease in roughness value during grinding and an increase of the tool life during turning. Unconventional machining such as laser-assisted turning is effective to increase tool life. Under certain conditions, a “wear shield” was observed during the early stages of tool wear during turning, thereby increasing tool life considerably. The studies carried out on milling showed that the cutting parameters affecting surface roughness and tool wear are dependent on the tool material. The high temperatures and high shears that occur during machining lead to microstructural changes in the workpiece during grinding, and in the chips during turning. The adiabatic shear band (ASB) of the chips is the seat of the sub-grains’ formation. Finally, the cutting speed and lubrication influenced dust emission during turning but more studies are needed to validate this finding. For the milling or grinding, there are major areas to be considered for thoroughly understanding the machining behavior of TiMMCs (tool wear mechanisms, chip formation, dust emission, etc.).
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