{"title":"Lecture for Beginners Studying Electrical Machining (1)","authors":"H. Obara","doi":"10.2526/JSEME.38.88_29","DOIUrl":"https://doi.org/10.2526/JSEME.38.88_29","url":null,"abstract":"","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125615705","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}
H. Tsuchiya, H. Goto, M. Miyazaki, K. Egashira, K. Sudo, K. Ono
Electrical discharge phenomena in fluids have been observed using suspended small steel balls placed between electrodes, in order to investigate the effect of debris not attached to tool electrodes or a workpiece on the generation of discharge in electrodischarge machining (EDM). Discharge occurs at certain voltages only when a ball is inserted between electrodes. Images taken using a high-speed camera show that, with one ball, the first dielectric breakdown takes place between one electrode and the ball, followed by the second breakdown between the other electrode and the ball, before spark discharge begins between the electrodes. With two balls, the breakdowns between an electrode and a ball precede that between the balls. These results suggest that the presence of suspended debris facilitates the generation of discharge in EDM and that the discharge between electrodes occurs after breakdowns take place between an electrode and debris, between a workpiece and debris, and among debris. Electrical fields are calculated by the finite element method, indicating that the first breakdown occurs at the gap with the highest electrical field.
{"title":"Electrical Discharge Phenomena in Fluids with Suspended Conductive Particles between Electrodes","authors":"H. Tsuchiya, H. Goto, M. Miyazaki, K. Egashira, K. Sudo, K. Ono","doi":"10.2526/jseme.38.88_21","DOIUrl":"https://doi.org/10.2526/jseme.38.88_21","url":null,"abstract":"Electrical discharge phenomena in fluids have been observed using suspended small steel balls placed between electrodes, in order to investigate the effect of debris not attached to tool electrodes or a workpiece on the generation of discharge in electrodischarge machining (EDM). Discharge occurs at certain voltages only when a ball is inserted between electrodes. Images taken using a high-speed camera show that, with one ball, the first dielectric breakdown takes place between one electrode and the ball, followed by the second breakdown between the other electrode and the ball, before spark discharge begins between the electrodes. With two balls, the breakdowns between an electrode and a ball precede that between the balls. These results suggest that the presence of suspended debris facilitates the generation of discharge in EDM and that the discharge between electrodes occurs after breakdowns take place between an electrode and debris, between a workpiece and debris, and among debris. Electrical fields are calculated by the finite element method, indicating that the first breakdown occurs at the gap with the highest electrical field.","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115022232","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}
{"title":"Surface Modification by Electric Discharge Machining (2nd Report) : Application of Surface Modification of electric discharge machining for complicated shapes","authors":"M. Sano, K. Yatsushiro, K. Okada","doi":"10.2526/jseme.38.88_13","DOIUrl":"https://doi.org/10.2526/jseme.38.88_13","url":null,"abstract":"","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115398866","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}
Y. Sakai, N. Ooba, H. Ogawa, O. Yasuda, H. Katougi
{"title":"Electrode Materials for Electrical Discharge Machining","authors":"Y. Sakai, N. Ooba, H. Ogawa, O. Yasuda, H. Katougi","doi":"10.2526/JSEME.38.7","DOIUrl":"https://doi.org/10.2526/JSEME.38.7","url":null,"abstract":"","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114603579","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}
In this study, it was clarified that discharge locations can be controlled by the principle of locally superimposing high electric fields. Based on this principle, two methods were proposed to improve the controllability of discharge locations in wire electrical discharge machining (WEDM): 1) improving the local high electric field by increasing the superimposing voltage, 2) increasing the discharge probability by successive superimposition in each discharge cycle. The experimental results showed that discharge locations in conventional dry-WEDM can be dispersed uniformly over the workpiece surface, and the discharge can successfully be moved to the vicinity of the point where high voltage is applied.
{"title":"Improvement of Controllability of Discharge Locations in WEDM","authors":"Fuzhu Han, M. Kunieda, Hiroto Asano","doi":"10.2526/JSEME.38.31","DOIUrl":"https://doi.org/10.2526/JSEME.38.31","url":null,"abstract":"In this study, it was clarified that discharge locations can be controlled by the principle of locally superimposing high electric fields. Based on this principle, two methods were proposed to improve the controllability of discharge locations in wire electrical discharge machining (WEDM): 1) improving the local high electric field by increasing the superimposing voltage, 2) increasing the discharge probability by successive superimposition in each discharge cycle. The experimental results showed that discharge locations in conventional dry-WEDM can be dispersed uniformly over the workpiece surface, and the discharge can successfully be moved to the vicinity of the point where high voltage is applied.","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122907998","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}
Hidekazu Tsukahara, H. Minami, K. Masui, T. Sone, K. Demizu
In this paper, we describe the tribological properties of the carbonization layer of titanium using EDM process. Modified layer under optimum conditions had a high carbon content and had an amorphous carbon area at the crater circumference. By using this method, a TiC layer with excellent tribological properties, low friction coefficient, minimal fluctuation and wear of mating material ball was obtained. This effect was suggested to influence amorphous carbon area of the extremely surface. The EDM process proved to be effective for the efficient surface modification of titanium.
{"title":"Tribological Properties of Surface Modified Layer of Titanium using EDM Process","authors":"Hidekazu Tsukahara, H. Minami, K. Masui, T. Sone, K. Demizu","doi":"10.2526/JSEME.38.24","DOIUrl":"https://doi.org/10.2526/JSEME.38.24","url":null,"abstract":"In this paper, we describe the tribological properties of the carbonization layer of titanium using EDM process. Modified layer under optimum conditions had a high carbon content and had an amorphous carbon area at the crater circumference. By using this method, a TiC layer with excellent tribological properties, low friction coefficient, minimal fluctuation and wear of mating material ball was obtained. This effect was suggested to influence amorphous carbon area of the extremely surface. The EDM process proved to be effective for the efficient surface modification of titanium.","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126503653","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}
Hidekazu Tsukahara, H. Minami, Seojoon Lee, H. Hagino, K. Masui, T. Sone
In this paper, we examine the EDM process utilizing chemical reactions between organometallic compounds. The oxidization of the dielectric oil facilitates in proportion to working time. The reaction between organometallic compounds causes their transition from a hydrocarbon to a fatty acid containing carboxylic acid, etc. When an oxidized dielectric oil is used in EDM, the metal elements in the electrode and workpiece react to the oxidized oil and organometallic compounds are consequently formed. Several organometallic compounds are olephilic and dissolve in dielectric oil. This denotes that some of the debris from the electrode and/or workpiece metal are dissolved in the dielectric oil. This reaction is often observed as a change in the color of the dielectric oil, such as in the case of the organometallic compound iron, which becomes yellow. The reaction strongly influences the EDM process.Accordingly, by actively utilizing the reactions between organometallic compounds, some of the debris from the electrode and/or workpiece can be dissolved in dielectric oil. This would result in a decrease in debris and provide stability to the EDM process.
{"title":"EDM Process Using Chemical Reaction of Organometallic Compound","authors":"Hidekazu Tsukahara, H. Minami, Seojoon Lee, H. Hagino, K. Masui, T. Sone","doi":"10.2526/JSEME.38.37","DOIUrl":"https://doi.org/10.2526/JSEME.38.37","url":null,"abstract":"In this paper, we examine the EDM process utilizing chemical reactions between organometallic compounds. The oxidization of the dielectric oil facilitates in proportion to working time. The reaction between organometallic compounds causes their transition from a hydrocarbon to a fatty acid containing carboxylic acid, etc. When an oxidized dielectric oil is used in EDM, the metal elements in the electrode and workpiece react to the oxidized oil and organometallic compounds are consequently formed. Several organometallic compounds are olephilic and dissolve in dielectric oil. This denotes that some of the debris from the electrode and/or workpiece metal are dissolved in the dielectric oil. This reaction is often observed as a change in the color of the dielectric oil, such as in the case of the organometallic compound iron, which becomes yellow. The reaction strongly influences the EDM process.Accordingly, by actively utilizing the reactions between organometallic compounds, some of the debris from the electrode and/or workpiece can be dissolved in dielectric oil. This would result in a decrease in debris and provide stability to the EDM process.","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134624042","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}
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