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International Journal of Electrical Machining最新文献

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Analysis of Electromagnetic Force in Rough Cutting of Wire-EDM 电火花线切割粗切过程中的电磁力分析
International Journal of Electrical Machining Pub Date : 1900-01-01 DOI: 10.2526/ijem.14.17
Shunsuke Tomura, M. Kunieda
{"title":"Analysis of Electromagnetic Force in Rough Cutting of Wire-EDM","authors":"Shunsuke Tomura, M. Kunieda","doi":"10.2526/ijem.14.17","DOIUrl":"https://doi.org/10.2526/ijem.14.17","url":null,"abstract":"This paper describes changes in the electromagnetic force applied to the wire electrode with increasing depth of cut in wire electrical discharge machining (WEDM). In this study, the electromagnetic force was analyzed by finite element method (FEM). Vibration of the wire when the electromagnetic force was applied to the wire independently was also analyzed. The wire movement was then measured when the current in the wire was changed in the same way as the discharge current with the gap voltage between the wire and workpiece kept at zero. It was found that the electromagnetic force is repulsive when the workpiece material is copper and attractive when the workpiece is steel. In both cases, the force is maximum when the depth of cut is about equal to or smaller than the wire diameter. Compared with the impulse of the electrostatic force, the impulse of the electromagnetic force is even larger in rough cutting.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"25 22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125766193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Machining Characteristics of Wire Electrical Discharge Machining on Insulating Si 3 N 4 Ceramics: -Relationship between Electrical Conductive Layer and Machining Characteristics- 绝缘si3n4陶瓷的线切割加工特性——导电层与加工特性的关系
International Journal of Electrical Machining Pub Date : 1900-01-01 DOI: 10.2526/JSEME.42.137
Hiromitsu Gotoh, T. Tani, N. Mohri
{"title":"Machining Characteristics of Wire Electrical Discharge Machining on Insulating Si 3 N 4 Ceramics: -Relationship between Electrical Conductive Layer and Machining Characteristics-","authors":"Hiromitsu Gotoh, T. Tani, N. Mohri","doi":"10.2526/JSEME.42.137","DOIUrl":"https://doi.org/10.2526/JSEME.42.137","url":null,"abstract":"In recent years, ceramics materials have found increased use in industry. However, some of them are insulating ceramics that cannot be machined by conventional electrical discharge machining. In this study, we developed a special wire EDM machine for investigating the machining characteristics of insulating ceramics. The machining characteristics of Si3N4 insulating ceramics, especially surface roughness, are described. It was confirmed that long-pulse discharges are minimally generated under the second cutting conditions where small discharge craters are uniformly formed on the machined surface. The resulting surface roughness was improved down to 4μmRz. In addition, a unique process of machining with insulating ceramics, in which the threshold level becomes almost of the same as the voltage between the discharge and power supply positions, was observed.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129346871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Surface Modification by EDM with Nickel Powder Mixed Fluid 镍粉混合流体电火花加工表面改性
International Journal of Electrical Machining Pub Date : 1900-01-01 DOI: 10.2526/ijem.4.47
Y. Uno, A. Okada, Y. Hayashi, Y. Tabuchi
{"title":"Surface Modification by EDM with Nickel Powder Mixed Fluid","authors":"Y. Uno, A. Okada, Y. Hayashi, Y. Tabuchi","doi":"10.2526/ijem.4.47","DOIUrl":"https://doi.org/10.2526/ijem.4.47","url":null,"abstract":"Surface modification of aluminum bronze used for shell mold core metal was experimentally investigated by EDM with nickel powder mixed fluid, in order to form nickel layer on EDMed surface for higher wear resistance to shell sand abrasion. Experimental analyses made it clear that the resolidified layer contained nickel richly and the thickness of the layer became larger and uniform with an increase of nickel powder concentration in the machining fluid. The EDMed surface with nickel powder mixed fluid was harder and smoother than that with kerosine type fluid. Moreover, it showed higher wear resistance in sand abrasion test.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130057290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 17
Machining Characteristics of Wire Electrical Discharge Machining on Insulating Si3N4 Ceramics 绝缘Si3N4陶瓷的线切割加工特性
International Journal of Electrical Machining Pub Date : 1900-01-01 DOI: 10.2526/IJEM.20.17
Hiromitsu Gotoh, T. Tani, N. Mohri
{"title":"Machining Characteristics of Wire Electrical Discharge Machining on Insulating Si3N4 Ceramics","authors":"Hiromitsu Gotoh, T. Tani, N. Mohri","doi":"10.2526/IJEM.20.17","DOIUrl":"https://doi.org/10.2526/IJEM.20.17","url":null,"abstract":"","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131085903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Three-Dimensional Analysis of Residual Stress in EDM Process 电火花加工中残余应力的三维分析
International Journal of Electrical Machining Pub Date : 1900-01-01 DOI: 10.2526/ijem.1.27
Youshen Yang, Y. Mukoyama
{"title":"Three-Dimensional Analysis of Residual Stress in EDM Process","authors":"Youshen Yang, Y. Mukoyama","doi":"10.2526/ijem.1.27","DOIUrl":"https://doi.org/10.2526/ijem.1.27","url":null,"abstract":"In electrical discharge machining(EDM) process, the residual stress is generated generally in the surface layer of the workpiece due to the effects of the heating and cooling process. The stress causes decrease of fatigue strength, delayed fracture and stress corrosion which affect quality of the workpiece. In the present paper, based on thermal elastic-plastic theory, a new calculation procedure of the three-dimensional analysis of thermal stress and residual stress is developed by utilizing the FEM in which the temperature dependencies of physical-mechanical properties of workpiece material are taken into consideration. The analysis shows that the radial stress and the circumferential stress in the layer below the crater are beyond the tensile strength of the material, and result in the generation of the crack.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"28 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131240825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Process Analysis and Practice-Oriented Modelling of Laser Bending Operations Using the Temperature Gradient Mechanism 基于温度梯度机制的激光弯曲加工过程分析及面向实践的建模
International Journal of Electrical Machining Pub Date : 1900-01-01 DOI: 10.2526/ijem.5.17
F. Klocke, A. Demmer, C. Dietz
{"title":"Process Analysis and Practice-Oriented Modelling of Laser Bending Operations Using the Temperature Gradient Mechanism","authors":"F. Klocke, A. Demmer, C. Dietz","doi":"10.2526/ijem.5.17","DOIUrl":"https://doi.org/10.2526/ijem.5.17","url":null,"abstract":"The application of thermal forming operations using the laser beam represents a new approach to flexible forming. Although the underlying mechanisms involved in laser beam bending are generally accepted 2),8),9), there is no simple process model which is suited to process design. For defined forming operations it is essential to ensure selective generation of the temperature field in the part. The progress of the process will be analysed experimentally in a single machining operation using forming mechanisms and variables of relevance to the temperature gradient, and conclusions will be drawn from this regarding a process model suitable for practical application. The modelling process will be conducted in two stages: firstly the calculation of the temperature field inside the workpiece and secondly the reproduction of the mechanical bending operation. The process model developed in this way will be compared with results obtained in experiments and evaluated.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122620536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Surface replication with one-nanometer.level smoothness by a nickel electroforming process 一纳米的表面复制。镍电铸工艺的平整平滑度
International Journal of Electrical Machining Pub Date : 1900-01-01 DOI: 10.2526/IJEM.16.21
H. Mimura, S. Matsuyama, Y. Sano, K. Yamauchi
{"title":"Surface replication with one-nanometer.level smoothness by a nickel electroforming process","authors":"H. Mimura, S. Matsuyama, Y. Sano, K. Yamauchi","doi":"10.2526/IJEM.16.21","DOIUrl":"https://doi.org/10.2526/IJEM.16.21","url":null,"abstract":"A surface replication process is necessary for the mass production of nanometer-sized patterned and/or nanometer-flat surfaces. We have been developing a surface replication technique, aiming for 1 nanometer level replication accuracy in height direction. The process is based on nickel electroforming under low-temperature conditions. To investigate replication accuracy, we used an EEM (elastic emission machining) processed surface, having 0.1 nm flatness in root-mean-square (RMS) as a master surface, and compared the roughness of the master and replicated surfaces. The surface roughness is evaluated by using phase-shift microscopic interferometry and atomic force microscopy. The results indicate that surface replication is possible for one-nanometer–level smoothness. The durability of the master surface and repeatability of the process are also investigated. Surface quality of the master surface was found to be maintained during multiple electroforming processes.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125706157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Reduction of Tool Wear in Non-contact Electrostatic Induction Feeding EDM 非接触式静电感应进给电火花加工中刀具磨损的降低
International Journal of Electrical Machining Pub Date : 1900-01-01 DOI: 10.2526/IJEM.17.23
Yuna Yahagi, W. Natsu, T. Koyano, M. Kunieda
{"title":"Reduction of Tool Wear in Non-contact Electrostatic Induction Feeding EDM","authors":"Yuna Yahagi, W. Natsu, T. Koyano, M. Kunieda","doi":"10.2526/IJEM.17.23","DOIUrl":"https://doi.org/10.2526/IJEM.17.23","url":null,"abstract":"In this study, the authors aimed to decrease tool wear ratio in non-contact electrostatic induction feeding for micro electrical discharge machining (EDM). Since this electrostatic induction feeding method is capable of non-contact electric feeding to the tool electrode, the tool electrode can be rotated at a high speeds of 50,000rpm or more. Accordingly, both material removal rate and machining accuracy can be improved. With this method however, since discharges occur with alternating polarity, the tool electrode wear rate is higher than conventional unipolarity pulse discharge where the polarity of the workpiece is positive. Thus, in this study, circuit impedance was switched alternately to decrease the tool wear ratio, so that the discharge peak current becomes high when the workpiece is negatively charged, and low when positively charged. As a result, the tool wear ratio equivalent to conventional unipolarity discharge was achieved.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131798957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Fabrication of Abrasive Layer Using Dispersion of Hard Powder by Electrical Discharge Machining (1st Report)-Dispersion of Insulating Powder into Deposit- 利用硬质粉末分散体电火花加工制备磨料层(第一报告)-绝缘粉末分散成沉积体-
International Journal of Electrical Machining Pub Date : 1900-01-01 DOI: 10.2526/JSEME.37.23
K. Furutani, H. Sunada
{"title":"Fabrication of Abrasive Layer Using Dispersion of Hard Powder by Electrical Discharge Machining (1st Report)-Dispersion of Insulating Powder into Deposit-","authors":"K. Furutani, H. Sunada","doi":"10.2526/JSEME.37.23","DOIUrl":"https://doi.org/10.2526/JSEME.37.23","url":null,"abstract":"This paper deals with a fabrication method of an abrasive layer by electrical discharge machining (EDM). A grinding wheel should be frequently dressed and as a result its total life becomes shorter. When the total life of the grinding wheel has ended, the grinding wheel is disposed of even if its core is still usable. To extend the total life of the grinding wheel by recycling, a fabrication process of an abrasive layer by EDM is proposed. The layer deposited by EDM with a green compact electrode is porous due to the electrical conditions. The green compact electrode was made by compressing a mixture of WC, Co and an abrasive, which is generally an insulating material. The layer produced with the dispersed abrasive powders with a size of 20-100 ~m could be deposited on a plate. The grain size and the thermal conductivity mainly affect the layer properties. Each grain volume percentage was evaluated with a partial section analyzed by energy dispersive X-ray spectroscopy. The volume percentages of #150 and #400 SiC grains were 6% and 10%, respectively, when the volume percentage of the SiC grains in each electrode was 32%. These ratios are much srn all er than that of conventional grinding wheels, 34-62% in nominal. The hardness of the WC-Co layer without abrasive was 102 HRRS, harder than a general vitrified bond wheel. Because the deposit of the weco layer was very hard, tight gripping of grits can be also expected.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131657076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Effect of Debris Accumulation on Machining Speed in EDM 电火花加工中碎屑堆积对加工速度的影响
International Journal of Electrical Machining Pub Date : 1900-01-01 DOI: 10.2526/ijem.9.9
S. Cetin, A. Okada, Y. Uno
{"title":"Effect of Debris Accumulation on Machining Speed in EDM","authors":"S. Cetin, A. Okada, Y. Uno","doi":"10.2526/ijem.9.9","DOIUrl":"https://doi.org/10.2526/ijem.9.9","url":null,"abstract":"This paper shows the effect of electrode jump height on machining speed and depth in deep machining for linear motor equipped electrical discharge machining. A new definition named \"Machining speed break point\" is introduced from the experiments. This new definition is then theoretically calculated from a proposed electrode jump and debris exclusion model, and compared with the experimental results. Additionally, an algorithm is developed to calculate the accumulation of debris in machining gap. The algorithm results showed that the debris concentration in gap rises suddenly before the machining speed break point.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133465608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 29
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