{"title":"Review of Leading-edge Laser Technology","authors":"T. Arai","doi":"10.2526/JSEME.37.86_10","DOIUrl":"https://doi.org/10.2526/JSEME.37.86_10","url":null,"abstract":"","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133152944","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":"Laser Metal Molding and Cutting Hybrid Machine","authors":"T. Takaoka, T. Yamaoka","doi":"10.2526/JSEME.37.86_38","DOIUrl":"https://doi.org/10.2526/JSEME.37.86_38","url":null,"abstract":"","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131422801","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":"CO2 Laser Drilling Machine for PCBs","authors":"Y. Imai, Yasuhiko Iwai","doi":"10.2526/JSEME.37.86_34","DOIUrl":"https://doi.org/10.2526/JSEME.37.86_34","url":null,"abstract":"","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128221234","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}
The possibility of EDM at open-circuit voltages of lower than 30V has been examined using an RC circuit, because low voltages are preferable in terms of machining accuracy; however, machining at such voltages had not been attempted before. EDM of holes in copper is carried out with tungsten electrodes of 15μm or 7μm diameter to investigate the machining rate. At open-circuit voltages of 5V or higher, the average electrode feed speed, which is defined as the feed per machining time, is higher than 5μm/min under certain electrical conditions. Although the machining rate is very low, machining is possible even at an open-circuit voltage of 2V. These voltages are much lower than those usually used for EDM. A tungsten rod of 1μm diameter can be fabricated at an open-circuit voltage of 20V by wire electrodischarge grinding (WEDG), indicating the possibility of future applications of EDM to submicron machining and nanomachining.
{"title":"EDM at Low Open-Circuit Voltage","authors":"K. Egashira, K. Mizutani","doi":"10.2526/JSEME.37.85_18","DOIUrl":"https://doi.org/10.2526/JSEME.37.85_18","url":null,"abstract":"The possibility of EDM at open-circuit voltages of lower than 30V has been examined using an RC circuit, because low voltages are preferable in terms of machining accuracy; however, machining at such voltages had not been attempted before. EDM of holes in copper is carried out with tungsten electrodes of 15μm or 7μm diameter to investigate the machining rate. At open-circuit voltages of 5V or higher, the average electrode feed speed, which is defined as the feed per machining time, is higher than 5μm/min under certain electrical conditions. Although the machining rate is very low, machining is possible even at an open-circuit voltage of 2V. These voltages are much lower than those usually used for EDM. A tungsten rod of 1μm diameter can be fabricated at an open-circuit voltage of 20V by wire electrodischarge grinding (WEDG), indicating the possibility of future applications of EDM to submicron machining and nanomachining.","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129959999","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":"Fundamental Study on Friction Characteristics of EDMed Surface","authors":"A. Okada, Y. Uno, Y. Nakashima","doi":"10.2526/JSEME.37.85_24","DOIUrl":"https://doi.org/10.2526/JSEME.37.85_24","url":null,"abstract":"","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116123394","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}
Heat-affected zones (HAZs) are generated by electrical discharge machining of cemented carbides. A surface modification method using an oxidation treatment of cemented carbides has been proposed as a removal method for the HAZs. The HAZs can be completely removed in the form of oxides through the oxidation treatment. In this study, a wire-drawing die with a bearing diameter of 10 mm was fabricated by wire electrical discharge machining (WEDM). Subsequently, this surface modification method for finishing the die was introduced to improve the die quality and to reduce the die manufacturing time. As a result, the surface integrity of the die is superior to that of the die finished by a conventional removal method. Defects such as cracks partially exist on a polished surface in the latter case. The HAZs are completely removed in 3 minutes by this oxidation treatment. It only takes 20 minutes to polish the die by incorporating this method into the die manufacturing process. The completion time of a wire-drawing die is approximately 50% shorter than that obtained by the conventional removal method.
{"title":"Manufacturing of Wire-Drawing Die Using a Removal Method of Heat-Affected Zones by Oxidation of Cemented Carbides","authors":"T. Tamura, Yoshinobu Kobayashi","doi":"10.2526/JSEME.37.85_10","DOIUrl":"https://doi.org/10.2526/JSEME.37.85_10","url":null,"abstract":"Heat-affected zones (HAZs) are generated by electrical discharge machining of cemented carbides. A surface modification method using an oxidation treatment of cemented carbides has been proposed as a removal method for the HAZs. The HAZs can be completely removed in the form of oxides through the oxidation treatment. In this study, a wire-drawing die with a bearing diameter of 10 mm was fabricated by wire electrical discharge machining (WEDM). Subsequently, this surface modification method for finishing the die was introduced to improve the die quality and to reduce the die manufacturing time. As a result, the surface integrity of the die is superior to that of the die finished by a conventional removal method. Defects such as cracks partially exist on a polished surface in the latter case. The HAZs are completely removed in 3 minutes by this oxidation treatment. It only takes 20 minutes to polish the die by incorporating this method into the die manufacturing process. The completion time of a wire-drawing die is approximately 50% shorter than that obtained by the conventional removal method.","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116250346","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}
This paper describes a newly developed hybrid EDM system which is composed of the multispark EDM system and conventional EDM system. Multispark EDM is characterized by higher removal rates and lower energy consumption compared with conventional EDM. However, it was difficult to obtain a continuously stable state with the multispark mode. This hybrid EDM system therefore switches the operation mode from the multispark mode to the conventional mode when the process becomes unstable. Then, if the gap state satisfies the condition under which the multispark mode can work stably, the mode is switched back to the multispark mode. From experiments, it was confirmed that the hybrid system developed works very well even under the machining conditions which make the process unstable with the multispark mode.
{"title":"Development of Hybrid EDM System Combining Multispark EDM and Conventional EDM","authors":"Toshiki Kobayashi, M. Kunieda","doi":"10.2526/JSEME.37.9","DOIUrl":"https://doi.org/10.2526/JSEME.37.9","url":null,"abstract":"This paper describes a newly developed hybrid EDM system which is composed of the multispark EDM system and conventional EDM system. Multispark EDM is characterized by higher removal rates and lower energy consumption compared with conventional EDM. However, it was difficult to obtain a continuously stable state with the multispark mode. This hybrid EDM system therefore switches the operation mode from the multispark mode to the conventional mode when the process becomes unstable. Then, if the gap state satisfies the condition under which the multispark mode can work stably, the mode is switched back to the multispark mode. From experiments, it was confirmed that the hybrid system developed works very well even under the machining conditions which make the process unstable with the multispark mode.","PeriodicalId":269071,"journal":{"name":"Journal of the Japan Society of Electrical-machining Engineers","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116013125","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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