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Artykuły w czasopismach na temat „Magnetic field- Electrical discharge machining”

Autor: Grafiati

Data publikacji: 6 września 2023

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1

Walkar, Hemant, Vijaykumar S. Jatti i T. P. Singh. "Magnetic Field Assisted Electrical Discharge Machining of AISI 4140". Applied Mechanics and Materials 592-594 (lipiec 2014): 479–83. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.479.

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Electric discharge machining (EDM) is a non-conventional machining process in which material removal take place by a series of electric spark generated between the small gap of both electrode and both immersed in dielectric medium. The gap conditions of EDM significntly affect the stability of machining process. Thus, the machining performance would be improved by removing the debris from the machining gap fastly. In view of this, the objective of present work was to investigate the effect of magnetic field on the material removal rate (MRR) and surface roughness (SR), in conjunction with the variation of electrical parameters like pulse on-off times and gap current, while keeping other electrical parameters and work piece/ tool material constant. Experimental results showed that the magnetic field assisted EDM improves the process stability. Moreover, the EDM process with high efficiency and quality of machined parts could fulfill the requirements of modern manufacturing industries.

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2

Zhang, Zhen, Yi Zhang, Wuyi Ming, Yanming Zhang, Chen Cao i Guojun Zhang. "A review on magnetic field assisted electrical discharge machining". Journal of Manufacturing Processes 64 (kwiecień 2021): 694–722. http://dx.doi.org/10.1016/j.jmapro.2021.01.054.

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3

Cheng, Chih-Ping, Kun-Ling Wu, Chao-Chuang Mai, Yu-Shan Hsu i Biing-Hwa Yan. "Magnetic field-assisted electrochemical discharge machining". Journal of Micromechanics and Microengineering 20, nr 7 (7.06.2010): 075019. http://dx.doi.org/10.1088/0960-1317/20/7/075019.

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4

Rouniyar, Arun Kumar, i Pragya Shandilya. "Fabrication and experimental investigation of magnetic field assisted powder mixed electrical discharge machining on machining of aluminum 6061 alloy". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 233, nr 12 (26.03.2019): 2283–91. http://dx.doi.org/10.1177/0954405419838954.

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Magnetic field assisted powder mixed electrical discharge machining is a hybrid machining process with suitable modification in electrical discharge machining combining the use of magnetic field and fine powder in the dielectric fluid. Aluminum 6061 alloy has found highly significance for the advanced industries like automotive, aerospace, electrical, marine, food processing and chemical due to good corrosion resistance, high strength-to-weight ratio, ease of weldability. In this present work, magnetic field assisted powder mixed electrical discharge machining setup was fabricated and experiments were performed using one factor at a time approach for aluminum 6061 alloy. The individual effect of machining parameters namely, peak current, pulse on time, pulse off time, powder concentration and magnetic field on material removal rate and tool wear rate was investigated. The effect of peak current was found to be dominant on material removal rate and tool wear rate followed by pulse on time, powder concentration and magnetic field. Increase in material removal rate and tool wear rate was observed with increase in peak current, pulse on time and a decrease in pulse off time, whereas, for material removal rate increases and tool wear rate decreases up to the certain value and follow the reverse trend with an increase in powder concentration. Material removal rate was increased and tool wear rate was decreased with increase in magnetic field.

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5

Yu, Po Huai, Jung Chou Hung, Hsin Min Lee, Kun Ling Wu i Biing Hwa Yan. "Machining Characteristics of Magnetic Force-Assisted Electrolytic Machining for Polycrystalline Silicon". Advanced Materials Research 325 (sierpień 2011): 523–29. http://dx.doi.org/10.4028/www.scientific.net/amr.325.523.

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Wire electrical discharge machining (WEDM) of polycrystalline silicon (polysilicon) involves high-temperature melting that easily produces cracks on the silicon surface. This paper studies improvements of cracks and craters on surface of polysilicon after wire electrical discharge machining (WEDM) by magnetic force-assisted electrolytic machining (MFA-EM). The effects of different MFA-EM parameters on material removal and surface roughness are explored to understand the machining characteristics of MFA-EM and how magnetic field assistance contributes to high-efficiency and high-quality machining. Experimental results show that compared with standard EM, MFA-EM can achieve better machining efficiency and surface quality because MFA-EM can effectively enhance electrolyte circulation and replenishment, which contributes to better machining stability.

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6

Yeo, S. H., M. Murali i H. T. Cheah. "Magnetic field assisted micro electro-discharge machining". Journal of Micromechanics and Microengineering 14, nr 11 (11.08.2004): 1526–29. http://dx.doi.org/10.1088/0960-1317/14/11/013.

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7

Jadhav, Rahul R., Vijaykumar S. Jatti i T. P. Singh. "Magnetic Field Assisted Electric Discharge Machining of Cryo-Treated Monel 400 Alloy". Applied Mechanics and Materials 787 (sierpień 2015): 371–75. http://dx.doi.org/10.4028/www.scientific.net/amm.787.371.

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Monel alloys are pioneering materials which have exceptional engineering properties such as corrosion resistance, high toughness and show good response to cryogenic treatment. It finds uses in ship building, nuclear aerospace, missile and valve industries. These materials shows strain hardening effect which results in tool wear and in some cases tool breakage when machined by conventional methodshence, unconventional machining such as electrical discharge machining (EDM)discoverspurpose for machining of such materials. Researchers have recognized relation between electrical input process parameters of EDM process and output parameters of EDM process. But researchers have not investigated the influence of external magnetic field and cryo-treatment of work piece on EDM performance measures namely material removal rate (MRR) and tool wear rate (TWR). In vision of this the objective of present work was to study the effect of gap current, external magnetic field and cryogenic treatment of work part on MRR and TWR. Experiments were carried out by creating a 3 mm square hole on Monel400 alloys. Based on experimental results it was found that as gap current increases the MRR and TWR increases for untreated work part. For treated work part MRR increases and TWR decreases with increasein gap current. MRR and TWR increases with constant gap current for untreated work part, as magnetic field increases. For treated work part MRR increases and TWR decreases with increase in magnetic field at constant gap current.

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8

Takezawa, Hideki, Nobuhiro Yokote i Naotake Mohri. "External Magnetic Field Control during EDM of a Permanent Magnet". Advanced Materials Research 1017 (wrzesień 2014): 806–11. http://dx.doi.org/10.4028/www.scientific.net/amr.1017.806.

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The effect of changes in the magnetic field on the magnetic flux density during the electrical discharge machining (EDM) of a permanent magnet is reported. During EDM of the permanent magnet, a second magnet for the external magnetic field was set up, and the internal temperature and surface magnetic flux density on the opposite surface of the permanent magnet during machining were evaluated. It was found that even though the internal temperature of the magnet remained unchanged, the surface magnetic flux density changed when the external magnetic field was varied. In addition, the magnetic field generated by the magnet changed when a plate with high permeability was pressed onto the surface of the permanent magnet.

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9

Ablyaz, Timur Rizovich, Preetkanwal Singh Bains, Sarabjeet Singh Sidhu, Karim Ravilevich Muratov i Evgeny Sergeevich Shlykov. "Impact of Magnetic Field Environment on the EDM Performance of Al-SiC Metal Matrix Composite". Micromachines 12, nr 5 (21.04.2021): 469. http://dx.doi.org/10.3390/mi12050469.

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In the present work, a hybrid magnetic field assisted powder mixed electrical discharge machining had been carried out on the Aluminum-Silicon Carbide (Al-SiC) metal matrix composite. The aim of the study was to obtain higher surface finish, and enhanced material removal rate. The dielectric mediums employed were plain EDM oil, SiCp mixed and graphite powder mixed EDM oil for flushing through the tube electrode. The magnetic field intensity, discharge current, T-on/off duration and type of dielectric were the control variables used for present investigation. From the results, it was observed that the machining variables for instance, discharge current, T-on/off duration and type of dielectric conditions remarkably affected the material removal rate, micro-hardness and surface roughness of the machined composite material. The MRR augmented considerably with an increase in the magnetic field intensity along with peak current. Subsequently, the composite with lesser vol.% of SiC particulates witnessed sharp rise in MRR in maximum magnetic field environment (0.66T). In addition, quality of the machined surface improved significantly in graphite powder mixed dielectric flushing condition with intermediate external magnetic field environment. Besides, an enhancement of micro-hardness was quantified as compared to base material due to the transfer of the material (SiCp) during powder mixed ED machining.

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10

Teimouri, Reza, i Hamid Baseri. "Study of Tool Wear and Overcut in EDM Process with Rotary Tool and Magnetic Field". Advances in Tribology 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/895918.

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Tool wear and workpiece overcut have been studied in electrical discharge machining process with rotational external magnetic field and rotational electrode. Experiments have been divided to three main regimes, namely, low-energy regime, middle-energy regime, and high-energy regime. The influence of process parameters were investigated on electrode wear rate and overcut. Results indicate that applying a magnetic field around the machining gap increases the electrode wear rate and overcut. Also, rotation of the tool has negative effect on overcut.

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11

Gupta, Abhishek, i Suhas S. Joshi. "Modelling effect of magnetic field on material removal in dry electrical discharge machining". Plasma Science and Technology 19, nr 2 (19.01.2017): 025505. http://dx.doi.org/10.1088/2058-6272/19/2/025505.

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12

Beravala, Hardik, i Pulak M. Pandey. "Modelling of material removal rate in the magnetic field and air-assisted electrical discharge machining". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, nr 7 (3.12.2019): 1286–97. http://dx.doi.org/10.1177/0954406219892297.

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In the present research work, an attempt has been made to develop the mathematical model to predict the material removal rate in the electrical discharge machining process when the assistance of air and magnetic field is provided together. The proposed model incorporates the physical phenomenon occurred during electrical discharge machining such as the plasma column expansion and reduction in the mean free path of electron in the plasma column due to magnetic field. In addition, the model incorporates the effect of air on the material removal rate. The developed model correlates the material removal rate with the process parameters such as the peak current, pulse duration, duty cycle, air pressure and magnetic flux density. The experimental data were used to evaluate the constants for district processing conditions. The relation between air pressure and breakdown voltage in the liquid-air mixed dielectric has been established experimentally. The obtained expression of material removal rate has been validated for the experimental conditions other than that used for obtaining constants. The results show less than 10% error in the prediction by the model over the respective experimental values.

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13

Chinke, Sandeep, Vijaykumar S. Jatti i T. P. Singh. "Electric Discharge Machining of Cryo-Treated BeCu Alloys". Applied Mechanics and Materials 787 (sierpień 2015): 386–90. http://dx.doi.org/10.4028/www.scientific.net/amm.787.386.

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Beryllium copper possesses high strength which produces severe problem of surface integrity and tool wear during machining by conventional machining process. Electrical discharge machining is a practically viable option to solve this problem. The present study investigates the effect of cryogenic treatment of work part along with gap current and external magnetic field on material removal rate (MRR) and tool wear rate (TWR). Blind 3 mm square holes were produced using electrolytic copper tool electrode to machine cryo-treated BeCu and untreated BeCu. Gap current is varied from 8 A to 16 A in a step of 2 amperes and magnetic strength is varied from 0 to 0.496 T in a step of 0.124 T. Based on the experimental results it was found that MRR increases with increase in gap current for both untreated BeCu and treated work part. Plotted graphs of cryo-treated work part showed high values of MRR in comparison to untreated work part. TWR increases for both treated and untreated BeCu work part with increase in gap current. But the TWR was less for cryo-treated work part in comparison to untreated work part. MRR and TWR increases for both treated and untreated BeCu work part with increasing magnetic strength. Again the MRR was found higher with lower TWR for treated workpiece with regard to magnetic strength. Thus it can be concluded that cryogenic-treatment with magnetic strength improves EDM machining efficiency.

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14

Kamide, Yukichi. "Electro discharge machining by steel tool electrode in a magnetic field." IEEJ Transactions on Industry Applications 109, nr 12 (1989): 889–96. http://dx.doi.org/10.1541/ieejias.109.889.

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15

Kovbasyuk, A. A., i M. Yu Sarilov. "IMPROVING THE EFFICIENCY OF ELECTRICAL DISCHARGE MACHINING DUE TO IMPOSITION OF EXTERNAL MAGNETIC FIELD". Scholarly Notes of Komsomolsk-na-Amure State Technical University 1, nr 11 (30.09.2012): 62–65. http://dx.doi.org/10.17084/2012.iii-1(11).10.

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16

Gholipoor, Ahad, Hamid Baseri, Mohsen Shakeri i Mohammadreza Shabgard. "Investigation of the effects of magnetic field on near-dry electrical discharge machining performance". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 230, nr 4 (16.12.2014): 744–51. http://dx.doi.org/10.1177/0954405414558737.

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17

Shabgard, Mohammad Reza, Ahad Gholipoor i Mousa Mohammadpourfard. "Investigating the effects of external magnetic field on machining characteristics of electrical discharge machining process, numerically and experimentally". International Journal of Advanced Manufacturing Technology 102, nr 1-4 (19.12.2018): 55–65. http://dx.doi.org/10.1007/s00170-018-3167-3.

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18

Kumar, Anish, i Renu Sharma. "Multi-response optimization of magnetic field assisted EDM through desirability function using response surface methodology". Journal of the Mechanical Behavior of Materials 29, nr 1 (13.04.2020): 19–35. http://dx.doi.org/10.1515/jmbm-2020-0003.

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AbstractMagnetic field assisted electrical discharge machining (MFAEDM) is the modification of in conventional EDM process by use of magnetic field on EN-31. This article explain the application of response surface methodology to analyzes the effect of various process parameters such as Ton, Toff and Ip on performance measures such as material removal rate (MRR), electrode wear rate (EWR) and overcut (OC). Analysis of variance was used to check the adequacy of response surface model and significance of process parameters on performance measures. Multi-objective desirability function has been applied to obtain the optimal process parameter settings. Thereafter, machined surface of EN-31 characterized through SEM and EDX. The novelty of this paper is to improve the strategies for flushing the debris which remain clogged in standard EDM in-between machining gap that will interrupts the regular discharge conditions and reduces cutting rate as well as deteriorate the surface characteristics.

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19

Chen, Zhi, i Guojun Zhang. "Study on magnetic field distribution and electro-magnetic deformation in wire electrical discharge machining sharp corner workpiece". International Journal of Advanced Manufacturing Technology 98, nr 5-8 (27.06.2018): 1913–23. http://dx.doi.org/10.1007/s00170-018-2260-y.

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20

Feng, C. C., L. Li, C. S. Zhang, G. M. Zheng, X. Bai i Z. W. Niu. "Surface Characteristics and Hydrophobicity of Ni-Ti Alloy through Magnetic Mixed Electrical Discharge Machining". Materials 12, nr 3 (26.01.2019): 388. http://dx.doi.org/10.3390/ma12030388.

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Nickel–titanium (Ni-Ti) alloy has been selected as stent material given its good biocompatibility. In this study, experimental research on this material was conducted using magnetic field-assisted electrical discharge machining (EDM). The surface topography of the machined workpiece was analyzed with a scanning electron microscope (SEM). Hydrophobicity was measured by using an optical contact angle measuring instrument. The roughness values of different positions on the surface were measured using a TR200 roughness instrument. Results showed that the composite structure of solidification bulge–crater–pore–particle can be prepared on the surface of the Ni-Ti alloy through magnetic mixed EDM using suitable processing parameters. Moreover, the contact angle of the surface reaches 138.2°.

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21

Ok, Jong Girl, Bo Hyun Kim, Do Kwan Chung, Woo Yong Sung, Seung Min Lee, Se Won Lee, Wal Jun Kim, Jin Woo Park, Chong Nam Chu i Yong Hyup Kim. "Electrical discharge machining of carbon nanomaterials in air: machining characteristics and the advanced field emission applications". Journal of Micromechanics and Microengineering 18, nr 2 (21.12.2007): 025007. http://dx.doi.org/10.1088/0960-1317/18/2/025007.

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22

Chattopadhyay, K. D., P. S. Satsangi, S. Verma i P. C. Sharma. "Analysis of rotary electrical discharge machining characteristics in reversal magnetic field for copper-en8 steel system". International Journal of Advanced Manufacturing Technology 38, nr 9-10 (14.08.2007): 925–37. http://dx.doi.org/10.1007/s00170-007-1149-y.

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Zabihi, Seyed Sina, Shahram Etemadi Haghighi, Hamid Soleimanimehr i Adel Maghsoudpour. "Effects of auxiliary magnetic field strength and direction on material removal rate and surface roughness in magnetic field-assisted electrical discharge machining". CIRP Journal of Manufacturing Science and Technology 41 (kwiecień 2023): 446–52. http://dx.doi.org/10.1016/j.cirpj.2023.01.008.

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Savita V. Jatti et al.,, Savita V. Jatti et al ,. "A Machinability Evaluation of Cryogenically Treated Beryllium Copper in a Magnetic Field Assisted by Electrical Discharge Machining". International Journal of Mechanical and Production Engineering Research and Development 8, nr 5 (2018): 77–84. http://dx.doi.org/10.24247/ijmperdoct201810.

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25

Ming, Wuyi, Zhen Zhang, Shengyong Wang, Yanming Zhang, Fan Shen i Guojun Zhang. "Comparative study of energy efficiency and environmental impact in magnetic field assisted and conventional electrical discharge machining". Journal of Cleaner Production 214 (marzec 2019): 12–28. http://dx.doi.org/10.1016/j.jclepro.2018.12.231.

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26

Rouniyar, Arun Kumar, i Pragya Shandilya. "Experimental Study on Material Removal Rate of Al6061 Machined with Magnetic Field Assisted Powder Mixed Electrical Discharge Machining". Journal of Physics: Conference Series 1240 (lipiec 2019): 012018. http://dx.doi.org/10.1088/1742-6596/1240/1/012018.

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27

Park, Juhyeon, Hoyong Lee, Gyejo Jung i Jinyi Lee. "Nondestructive testing of turbine disk roots using solid-state GMR sensor arrays and an axial directional scanning system". International Journal of Applied Electromagnetics and Mechanics 64, nr 1-4 (10.12.2020): 525–31. http://dx.doi.org/10.3233/jae-209360.

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A nondestructive testing device, consisting of a scanner and signal processing circuits was developed to detect cracks in turbine disk roots. The scanner consists of a longitudinal feeder and a fir-tree-shaped sensor probe. The feeder inserted the sensor probe along the grooves of the turbine blade attachment. Meanwhile, permanent magnets were placed in opposite direction, to generate a closed magnetic field between the magnetic sensors located on the crests of the sensor probe. The fatigue crack in the turbine disk root occurred in the circumferential direction of the turbine. As a result, magnetic flux leakage was caused by disturbing the flow of closed magnetic field by permanent magnets. The magnetic flux leakage was measured by a magnetic sensor. The effectiveness of the proposed device has been verified using artificial defects introduced into the turbine disk roots by electric discharge machining.

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28

Beravala, Hardik, i Pulak M. Pandey. "Characterization of Debris Formed in Magnetic Field-Assisted EDM Using Two-Phase Dielectric Fluid". Journal of Advanced Manufacturing Systems 19, nr 04 (grudzień 2020): 629–40. http://dx.doi.org/10.1142/s0219686720500353.

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The present research was focussed to investigate the influence of liquid-gaseous dielectric on debris formation in magnetic field-assisted electrical discharge machining. The air and argon gas were used to make two-phase dielectric fluids such as liquid-air and liquid-argon gas, respectively. Experimentation was conducted to compare the effect of different liquid-gaseous dielectric environments on debris formation. The morphology and diameter distribution of debris were analyzed. In addition, the effect on elemental analysis, phase transformation and magnetic property of debris was investigated. The experimental results showed the exothermic reaction due to air from liquid–air dielectric, and inert property of argon gas from liquid-gaseous dielectric affected the formation of debris. The XRD results confirmed the formation of oxides in the debris produced using liquid-air mixed dielectric. The oxide-free debris formed while using the argon gas. Low saturation of magnetization was found in the debris, formed in the liquid–air dielectric which showed the weak attraction toward magnet when compared with that in the liquid–argon gas mixed dielectric.

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29

Upadhyay, Lokesh, M. L. Aggarwal i Pulak M. Pandey. "Experimental investigations into rotary magnetic field and tool assisted electric discharge machining using magneto rheological fluid as dielectric". International Journal of Mechatronics and Manufacturing Systems 12, nr 1 (2019): 1. http://dx.doi.org/10.1504/ijmms.2019.097842.

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Upadhyay, Lokesh, M. L. Aggarwal i Pulak M. Pandey. "Experimental investigations into rotary magnetic field and tool assisted electric discharge machining using magneto rheological fluid as dielectric". International Journal of Mechatronics and Manufacturing Systems 12, nr 1 (2019): 1. http://dx.doi.org/10.1504/ijmms.2019.10019107.

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Luan, Boran, Xiaoyou Zhang, Fangchao Xu, Guang Yang, Junjie Jin, Chengcheng Xu, Feng Sun i Koichi Oka. "High Precision Magnetic Levitation Actuator for Micro-EDM". Actuators 11, nr 12 (2.12.2022): 361. http://dx.doi.org/10.3390/act11120361.

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Aiming at the efficiency and precision in micro electrical discharge machining (micro-EDM) is affected because the interpole voltage is unstable in conventional micro-EDM. This paper describes a five-degrees-of-freedom (5-DOF) controlled, wide-bandwidth, and high-precision magnetic levitation actuator. The conventional micro-EDM can install the actuator to maintain a stable interpole voltage between the electrode and workpiece to realize the high-speed micro-EDM. In this paper, the structure of the magnetic levitation actuator is designed, and the magnetic field characteristics are analyzed. On this basis, an integrator and regulator are used along with a controller with local current feedback to eliminate steady-state errors, stabilize the control system, and improve the bandwidth and positioning accuracy of the magnetic levitation actuator, and the dynamic performance of the actuator is evaluated. The experimental results show that the developed actuator has excellent positioning performance with micron-level positioning accuracy to meet the demand for the real-time, rapid, and accurate adjustment of the interpole gap during micro-EDM.

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Rouniyar, Arun Kumar, i Pragya Shandilya. "Experimental Investigation on Recast Layer and Surface Roughness on Aluminum 6061 Alloy During Magnetic Field Assisted Powder Mixed Electrical Discharge Machining". Journal of Materials Engineering and Performance 29, nr 12 (6.11.2020): 7981–92. http://dx.doi.org/10.1007/s11665-020-05244-4.

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Hourdequin, Hélène, Lionel Laudebat, Marie-Laure Locatelli, Zarel Valdez-Nava i Pierre Bidan. "Metallized ceramic substrate with mesa structure for voltage ramp-up of power modules". European Physical Journal Applied Physics 87, nr 2 (sierpień 2019): 20903. http://dx.doi.org/10.1051/epjap/2019180288.

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As the available wide bandgap semiconductors continuingly increase their operating voltages, the electrical insulation used in their packaging is increasingly constrained. More precisely the ceramic substrate, used in demanding applications, represents a key multi-functional element is being in charge of the mechanical support of the metallic track that interconnects the semiconductor chips with the rest of the power system, as well as of electrical insulation and of thermal conduction. In this complex assembly, the electric field enhancement at the triple junction between the ceramic, the metallic track borders and the insulating environment is usually a critical point. When the electrical field at the triple point exceeds the critical value allowed by the insulation system, this hampers the device performance and limits the voltage rating for future systems. The solution proposed here is based on the shape modification of the ceramic substrate by creating a mesa structure (plateau) that holds the metallic tracks in the assembly. A numerical simulation approach is used to optimize the structure. After the elaboration of the structures by ultrasonic machining we observed a significant increase (30%) in the partial discharge detection voltages, at 10 pC sensitivity, in a substrate with a mesa structure when comparing to a conventional metallized ceramic substrate.

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Chaudhari, Rakesh, Jay J. Vora, Vivek Patel, L. N. López de Lacalle i D. M. Parikh. "Effect of WEDM Process Parameters on Surface Morphology of Nitinol Shape Memory Alloy". Materials 13, nr 21 (3.11.2020): 4943. http://dx.doi.org/10.3390/ma13214943.

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Nickel–titanium shape memory alloys (SMAs) have started becoming popular owing to their unique ability to memorize or regain their original shape from the plastically deformed condition by means of heating or magnetic or mechanical loading. Nickel–titanium alloys, commonly known as nitinol, have been widely used in actuators, microelectromechanical system (MEMS) devices, and many other applications, including in the biomedical, aerospace, and automotive fields. However, nitinol is a difficult-to-cut material because of its versatile specific properties such as the shape memory effect, superelasticity, high specific strength, high wear and corrosion resistance, and severe strain hardening. There are several challenges faced when machining nitinol SMA with conventional machining techniques. Noncontact operation of the wire electrical discharge machining (WEDM) process between the tool (wire) and workpiece significantly eliminates the problems of conventional machining processes. The WEDM process consists of multiple input parameters that should be controlled to obtain great surface quality. In this study, the effect of WEDM process parameters on the surface morphology of nitinol SMA was studied using 3D surface analysis, scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) analysis. 3D surface analysis results indicated a higher value of surface roughness (SR) on the top of the work surface and a lower SR on the bottom portion of the work surface. The surface morphology of the machined sample obtained at optimized parameters showed a reduction in microcracks, micropores, and globules in comparison with the machined surface obtained at a high discharge energy level. EDX analysis indicated a machined surface free of molybdenum (tool electrode).

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Singh, Rahul Kumar, Mayank Tiwari, Anpeksh Ambreesh Saksena i Aman Srivastava. "Analysis of a Compact Squeeze Film Damper with Magneto Rheological Fluid". Defence Science Journal 70, nr 2 (9.03.2020): 122–30. http://dx.doi.org/10.14429/dsj.70.12788.

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Rotor systems play vital role in many modern day machinery such as turbines, pumps, aeroengines, gyroscopes, to name a few. Due to unavoidable unbalance in the rotor systems, there are lateral and torsional vibrations. Ignoring these effects may cause the system serious damages, which sometimes lead to catastrophic failures. Vibration level in rotor systems is acceptable within a range. Focus in this work is to minimize the vibration level to the acceptable range. One of the ways vibration level can be minimised is by means of providing damping. To accomplish this task in this work a new concept squeeze film damper is made by electro discharge machining which is compact in configuration, is filled with magneto-rheological (MR) fluid and tested out on one support of a Jeffcott rotor. This compact squeeze film damper (SFD) produces damping in a compact volume of the device compared to a conventional SFD. MR fluid is a smart fluid, for which apparent viscosity changes with the application of external magnetic field. This compact damper with MR fluid provides the variable damping force, controlled by an external magnetic field. In this work, proportional controller has been used for providing the control feedback. This MR damper is seen to reduce vibrations in steady state and transient input to the Jeffcott rotor. Parametric study for important design parameters has been done with the help of the simulation model. These controlled dampers can be used for reducing vibrations under different operating conditions and also crossing critical speed.

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Tuschl, Christoph, Beate Oswald-Tranta i Sven Eck. "Inductive Thermography as Non-Destructive Testing for Railway Rails". Applied Sciences 11, nr 3 (22.01.2021): 1003. http://dx.doi.org/10.3390/app11031003.

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Inductive thermography is a non-destructive testing method, whereby the specimen is slightly heated with a short heating pulse (0.1–1 s) and the temperature change on the surface is recorded with an infrared (IR) camera. Eddy current is induced by means of high frequency (HF) magnetic field in the surface ‘skin’ of the specimen. Since surface cracks disturb the eddy current distribution and the heat diffusion, they become visible in the IR images. Head checks and squats are specific types of damage in railway rails related to rolling contact fatigue (RCF). Inductive thermography can be excellently used to detect head checks and squats on rails, and the method is also applicable for characterizing individual cracks as well as crack networks. Several rail pieces with head checks, with artificial electrical discharge-machining (EDM)-cuts and with a squat defect were inspected using inductive thermography. Aiming towards rail inspection of the track, 1 m long rail pieces were inspected in two different ways: first via a ‘stop-and-go’ technique, through which their subsequent images are merged together into a panorama image, and secondly via scanning during a continuous movement of the rail. The advantages and disadvantages of both methods are compared and analyzed. Special image processing tools were developed to automatically fully characterize the rail defects (average crack angle, distance between cracks and average crack length) in the recorded IR images. Additionally, finite element simulations were used to investigate the effect of the measurement setup and of the crack parameters, in order to optimize the experiments.

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Zhao, Chenhao, Ningsong Qu i Xiaochuan Tang. "Confined Electrochemical Finishing of Additive-Manufactured Internal Holes with Coaxial Electrolyte Flushing". Journal of The Electrochemical Society 168, nr 11 (1.11.2021): 113504. http://dx.doi.org/10.1149/1945-7111/ac3782.

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Adhered powders and undesirable surface quality represent significant challenges for additive manufacturing (AM) technology. AM internal surface finishing is more difficult owing to the poor visibility of internal geometries and the inconvenient manipulation to machine tools. This paper proposed a confined electrochemical finishing process with a coaxial electrolyte flushing manner to remove the AM internal surface asperity. The insulation was conducted in the non-machining area of cathode to cease its electrochemical reaction which consumed the electric charge to generate gas bubbles, and the electrochemical dissolution could be confined within the AM internal hole. More intensive electrochemical dissolution was performed to the AM surface asperity and thus higher material removal and better surface finishing enhancement could be achieved. The coaxial electrolyte flushing manner created a uniform and efficient flow field to facilitate the discharge of electrolytic products. This technique could eliminate the partially melted powders adhered to the AM internal surface and reduce their Ra from 15.620 μm to 3.494 μm and Rz from 78.402 μm to 19.272 μm. The AM internal hole with a high aspect ratio of 10 could be well handled by this process to eliminate the adhered powders from its internal surface.

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Yaou, Zhang, Han Ning, Kang Xiaoming, Zhao Wansheng i Xu Kaixian. "Experimental study of an electrostatic field–induced electrolyte jet electrical discharge machining process". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, nr 10 (24.10.2015): 1752–59. http://dx.doi.org/10.1177/0954405415612327.

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In this study, a new electrostatic field–induced electrolyte jet electrical discharge machining method has been proposed, which can automatically generate the tool electrode. Then, a series of experiments have been carried out to reveal the machining mechanism and test the machining ability of this method. The continuous observation experiments and the online current detection experiments have demonstrated that the electrolyte jet discharge machining is a pulsing, dynamic and cyclic process. Moreover, the 20-min time long reverse polarity experiments on the silicon surface have revealed that the machining is an electrical discharge machining process during the negative polarity machining; however, in the positive polarity machining, it is a hybrid electrical discharge machining and electrochemical machining process. Furthermore, the craters as small as 2 µm in diameter on stainless steel and silicon are produced by this electrolyte jet electrical discharge machining, which has proved the micro-machining ability of this method.

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Takezawa, Hideki, Yoshihiro Ichimura, Tatsuya Suzuki, Tamao Muramatsu i Naotake Mohri. "Relationship between Thermal Influence and Magnetic Characteristics in Electrical Discharge Machining of Magnetic Materials". Key Engineering Materials 516 (czerwiec 2012): 575–79. http://dx.doi.org/10.4028/www.scientific.net/kem.516.575.

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t is difficult to perform traditional machining, including turning, milling and grinding, of a permanent magnet, which is a functional material, because of magnetic forces. However, electrical discharge machining (EDM), which is a non-contact machining method, has been used for shape machining of magnetic materials. In the EDM process, non-magnetic materials such as copper or graphite are typically used as electrodes. Magnetic materials have a Curie point; therefore, their magnetic flux density reduces when they are heated to a high temperature. Because EDM is a thermal process, it has the potential to control the magnetic flux density of a machined surface. In this study, to clarify the influence of magnetic flux density on a machined surface, the following machining conditions were investigated: (1) the Duty Factor (D.F.) and (2) the input energy of one pulse. A sintered neodymium material was used as the work piece. The magnetic flux density of a cross-section of a machined neodymium magnet was measured. The results showed that the influence of the magnetic flux density was low under low-energy machining conditions. In contrast, for high-energy machining conditions or a high D.F., the magnetic flux density significantly reduced compared to the initial value. These results confirm the importance of machining conditions for EDM of magnetic materials.

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Zhang, Xiao You, Akio Kifuji i Dong Jue He. "A Magnetic Drive Actuator for Micro Electrical Discharge Machining". Advanced Materials Research 591-593 (listopad 2012): 303–6. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.303.

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Electrical discharge machining has the capability of machining all conductive materials regardless of hardness, and has the ability to deal with complex shapes. However, the speed and accuracy of conventional EDM are limited by probability and efficiency of the electrical discharges. This paper describes a three degrees of freedom (3-DOF) controlled, wide-bandwidth, high-precision, long-stroke magnetic drive actuator. The actuator can be attached to conventional electrical discharge machines to realize a high-speed and high-accuracy EDM. The actuator primarily consists of thrust and radial magnetic bearings, thrust and radial air bearings and a magnetic coupling mechanism. By using the thrust and radial magnetic bearings, the translational motions of the spindle can be controlled. The magnetic drive actuator possesses a positioning resolution of the order of micrometer, a bandwidth greater than 100Hz and a positioning stroke of 2mm.

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Farkas, Balázs Zsolt, i Márton Takács. "3D Milling by Micro Electrical Discharge Machining". Materials Science Forum 659 (wrzesień 2010): 467–70. http://dx.doi.org/10.4028/www.scientific.net/msf.659.467.

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One of the most important tasks of the manufacturing engineering of our accelerated world is giving suitable answer to the ever growing demand on miniaturization arising on every field of the industry. Our institute has been carried out theoretical and experimental research work on micro machining since 10 years. Micro machining can be defined as formation of structures smaller than 1 mm. Our previous research activity focused primarily on micro milling process carried out by carbide end mill. Milling offers the most various machining method among the chip removal processes. Investigation of formation of micro structures by electrical discharge machining (EDM) is a perfect continuance of the research work. A process similar to micro milling can be realized by the lateral moving of the miniature cylindrical electrode of an EDM machine, just the physical principle of material removing is different. This paper introduces the latest results of our research work, including

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Schneider, Sebastian, Tim Herrig, Andreas Klink i Thomas Bergs. "Modeling of the temperature field induced during electrical discharge machining". CIRP Journal of Manufacturing Science and Technology 38 (sierpień 2022): 650–59. http://dx.doi.org/10.1016/j.cirpj.2022.05.012.

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Kim, B. H., J. G. Ok, Y. H. Kim i C. N. Chu. "Electrical Discharge Machining of Carbon Nanofiber for Uniform Field Emission". CIRP Annals 56, nr 1 (2007): 233–36. http://dx.doi.org/10.1016/j.cirp.2007.05.055.

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Cao, Ming Rang, Yan Qing Wang, Sheng Qiang Yang i Weng Hui Li. "Experimental and Mechanism Research on EDM Combined with Magnetic Field". Key Engineering Materials 416 (wrzesień 2009): 337–41. http://dx.doi.org/10.4028/www.scientific.net/kem.416.337.

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The two disadvantages of EDM are the low material removal rate (MRR) and poor surface quality. In this investigation, EDM assisted by magnetic field (MFEDM) has been proposed for the first time to overcome above-mentioned disadvantages. Constant magnetic field was applied to the both sides of discharge channel perpendicularly to form a novel process. In experiment, EDM machine tool D703F was used to machine nonferromagnetic materials. The machining parameters discharge current and pulse duration were chosen to determine the effects on material removal rate and surface roughness.Experiment results indicate that the MRR of the combined machining is 1.2~3 times of EDM’s one. Furthermore, the value of surface roughness is also reduced. Therefore, the introduction of magnetic field to EDM has important academic and practical values to the development of EDM.

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Bhatt, Geeta, Ajay Batish i Anirban Bhattacharya. "Experimental Investigation of Magnetic Field Assisted Powder Mixed Electric Discharge Machining". Particulate Science and Technology 33, nr 3 (29.09.2014): 246–56. http://dx.doi.org/10.1080/02726351.2014.968303.

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XIE, B. C., J. G. LIU i H. X. CUI. "INVESTIGATION OF DEBRIS PARTICLES DISTRIBUTION IN ELECTRICAL DISCHARGE MACHINING OF MICRO-HOLES ARRAY". Digest Journal of Nanomaterials and Biostructures 15, nr 1 (styczeń 2020): 15–23. http://dx.doi.org/10.15251/djnb.2020.151.15.

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Micro-holes array and micro-electrodes array are widely used in biomedical industry, aerospace industry and micro-electromechanical systems. The machining of micro-holes array is a difficult problem for traditional machining technology. Currently electrical discharge machining technology (EDM) is an alternative machining technology for the fabricating of micro-holes array in high strength and hardness of metal material because of it is free from mechanical force. However, distribution and concentration of debris particles in the discharge gap easily leads to the intensive distribution of discharge positions, which significantly influences machining performance of EDM of micro-holes array. In this study, a three-dimensional flow field simulation model of ultrasonic assisted EDM of micro-holes array is proposed by FLUENT software. The effect of ultrasonic vibration and the depth-to-diameter ratio on debris particles distribution in ultrasonic assisted EDM of micro-holes array will be investigated by numerical simulation. It is shown that reducing the depth-diameter ratio and increasing the ultrasonic amplitude and frequency are beneficial to enhance the exhaustion of debris particles out of the discharge gap and decrease the concentration of debris particles in the discharge gap. In addition, machining experiments are carried out.

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Schimmelpfennig, Tassilo Maria, Ivan Perfilov, Jan Streckenbach i Eckart Uhlmann. "Comparison of Conventional and Dry Electrical Discharge Machining". Applied Mechanics and Materials 794 (październik 2015): 278–84. http://dx.doi.org/10.4028/www.scientific.net/amm.794.278.

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For manufacturing of micro holes ElectricalDischarge Machining (EDM) can be used, which is well-established due toits thermal working principle that allows almost force free machining independent of the material’s mechanical properties. The importance of this production technology is increasing, especially for the machining of ceramic materials, which are required in many applications within the field of microtechnology. However, the production of precise micro holes with complex geometries and high aspect ratios is associated with a many challenges. Hightool electrode wear, low material removal rate and small gap widths are observed in the process. This paper presents an optimized dry EDM technology for the manufacturing of micro holes in Si3N4-TiNceramic. The experiments were carried out with different energy influencing process parameters for the spark discharge and flushing pressure, which were systematically evaluated by methods of statistical Design of Experiments. Subsequently dry EDM and conventional EDM micro drilling processes were compared and the differences between both processes were evaluated. The influences of liquid and gaseous dielectric are analyzed in terms of process stability and axis movements.

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Schulze, Hans Peter. "Applications of the Electro-Contact-Discharge Machining (ECoDM) and the Analysis of Different Process Parts". Key Engineering Materials 504-506 (luty 2012): 1195–200. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.1195.

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The Electro-Contact-Discharge Machining (ECoDM) is a hybrid process composed of Electrical Discharge Machining (EDM), Arc Discharge Machining (ADM), Contact Heating Proc-ess (CoHP), and Mechanical Machining (MM). The article presents a comparison of different ap-plications and the different influence of the machining parts for a necessary result. The application field ranges from ECoDM-Cutting to the cleaning of railway tracks. The analysis of the different processing parts is necessary for monitoring the process parameters (electrical and mechanical). An advantage of the ECoDM is the cutting of electric-conductive and partial electric-non-conductive materials. The application field is not high-precise machining but rather recycling and pre-working processing. The examples show that the focal point is not the process energy source, but the selec-tion of the processing parts through the analysis of the voltage curve and/or the current curve.

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Park, Jin Woo, Do Kwan Chung, Bo Hyun Kim, Jong Girl Ok, Wal Jun Kim, Yong Hyup Kim i Chong Nam Chu. "Wire electrical discharge machining of carbon nanofiber mats for field emission". International Journal of Precision Engineering and Manufacturing 13, nr 4 (kwiecień 2012): 593–99. http://dx.doi.org/10.1007/s12541-012-0076-5.

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KIFUJI, Akio, Xiaoyou ZHANG i Dongjue HE. "A08 A Long Stroke Magnetic Drive Actuator for Electrical Discharge Machining". Proceedings of The Manufacturing & Machine Tool Conference 2012.9 (2012): 27–28. http://dx.doi.org/10.1299/jsmemmt.2012.9.27.

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