International Journal of Electrical Machining最新文献

{"title":"Observation of ECM Gap Phenomena through Transparent Electrode","authors":"Wenhao Zhang, Tomoo Kitamura, M. Kunieda, K. Abe","doi":"10.2526/IJEM.19.40","DOIUrl":"https://doi.org/10.2526/IJEM.19.40","url":null,"abstract":"During the process of electrochemical machining (ECM), bubbles and sludge are generated in the inter electrode gap, affecting the machining accuracy significantly. To solve this problem, an electrolyte flow is supplied into the gap to flush them away. Hence, this study aimed to observe the flow of electrolyte and bubbles in the gap using a transparent electrode. SiC single crystal semiconductor was used as the cathode material because it is electrically conductive and optically transparent. The gap was observed through the SiC cathode in the direction normal to the electrode surface using a high speed video camera. Distr ibutions of the flow speed and diameter of bubbles were investigated to understand the influence of flushing flow on the machining process.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127692218","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":"Japan’s Electrical Machining and ISEM Technologies","authors":"N. Saito","doi":"10.2526/IJEM.19.1","DOIUrl":"https://doi.org/10.2526/IJEM.19.1","url":null,"abstract":"Research on electrical discharge machining (EDM) in Japan all began with Professor Seizaburo Ho of the University of Tokyo (Department of Electrical Engineering, Faculty of Engineering) watching a science movie made in the former Soviet Union. Together with Professor Hisao Kurafuji, also from the University of Tokyo (Department of Precision Engineering), they embarked on studies in this area by establishing the foundations of EDM and electrical machining societies in Japan. In this essay, I would like to talk about the roots of EDM as well as the International Symposium on Electromachining (ISEM), focusing on my own experiences of participating in ISEM Ⅱ onwards. In 1989, Japan hosted the ISEM (IX) for the first time. It proved to be a huge success and became by far the largest conference since it was started. From around 1995, mold-making trends using high speed milling have been accelerating. Cuttable shapes and large molds are gradually being replaced by high speed milling, and sinking EDM is declining. This has led to the need to find new applications for sinking EDM in areas other than mold-making. One example is its application to the electrical discharge coating of jet engine parts. There is also a need for further fundamental studies on sinking EDM as well as the development of electrochemical machining (ECM) techniques for cemented carbide besides EDM.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127222631","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":"Study on Electrolyte Jet Machining of Cemented Carbide","authors":"K. Mizugai, N. Shibuya, M. Kunieda","doi":"10.2526/IJEM.18.23","DOIUrl":"https://doi.org/10.2526/IJEM.18.23","url":null,"abstract":"This paper describes a new method to electrochemically machine cemented tungsten carbide using electrolyte jet machining (EJM). NaNO 3 aqueous solution was used as the electrolyte instead of a mixed aqueous solution of NaNO 3 and NaOH, which is normally used for the conventional electrochemical machining (ECM) of cemented tungsten carbide, but has hazardous characteristics. The machining was carried out successfully with both alternating current (AC) and direct current(DC). However, AC enabled more localized dissolution under the jet than DC. An insulator nozzle was employed for AC machining to prevent the nozzle wear. It was also useful for DC machining because dissolution was more localized.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121936662","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":"Electromagnetic effects of electrode materials and sizes on discharge current and wire vibration in Wire-EDM","authors":"K. Hada, M. Kunieda","doi":"10.2526/IJEM.18.17","DOIUrl":"https://doi.org/10.2526/IJEM.18.17","url":null,"abstract":"This study aims to develop a simulation tool to analyze the influence of wire structure, workpiece material, and workpiece thickness on the discharge current and wire vibration caused by the electromagnetic force observed in wire electrical discharge machining (WEDM), taking into consideration the electromagnetic field around the electrodes. The distribution of current density and magnetic flux density, electromagnetic force acting on the wire, and wire vibration were analyzed by coupling the equation for the entire discharge circuit with the Poisson’s equation of the magnetic vector potential around the wire. Monolithic brass wire showed higher discharge current than coated steel wire, resulting in larger electromagnetic force acting on the wire. A copper workpiece exhibits smaller but reversed phase wire vibration compared with steel workpiece. Thicker workpieces cause larger wire vibration because the electromagnetic force acts on the wire electrode along a greater distance.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127812671","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":"INVESTIGATION OF WIRE MOVEMENT IN FINE WIRE EDM BY HIGH-SPEED OBSERVATION","authors":"A. Okada, Sho Ichii, Y. Okamoto","doi":"10.2526/IJEM.18.43","DOIUrl":"https://doi.org/10.2526/IJEM.18.43","url":null,"abstract":"In the wire EDM using a thin wire electrode, the reduction of wire vibration is important to achieve a high-precision machining, since the large amplitude of wire vibration leads to large kerf width, low shape accuracy, rough machined surface, low cutting speed and high risk of wire breakage. In this study, the movements of thin wire electrode during the process were directly observed by using a high-speed video camera in order to clarify the wire movement in fine wire EDM. The effects of machining conditions on the wire movement in the direction perpendicular to the machining direction were experimentally investigated. The results showed that the wire vibration amplitude in fine fire EDM increased with the wire running speed and flow rate of jet flushing but decreased with the wire tension. Also, the wire vibration during the process includes various frequency vibrations with 1st order string vibration. Furthermore, the wire vibration frequency increased not only with the wire tension but also the discharge pulse frequency.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124009890","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":"Effect of Insulating Si3N4 Ceramics on Removal Rate by EDM with Piezoelectric Device","authors":"T. Tani, Hiromitsu Gotoh, Atsutoshi Hirao, N. Mohri","doi":"10.2526/IJEM.18.37","DOIUrl":"https://doi.org/10.2526/IJEM.18.37","url":null,"abstract":"This paper describes the machining characteristics of insulating ceramics by EDM (electrical discharge machining) with a piezoelectric device. A piezo scanner that can carry out drive control independently in the X-, Y-, and Z-directions was used for the piezoelectric device. Using the Z-axis as the main axis, dual servo control with a motor drive was applied, with oscillation in the Xand Y-axes, and the effects of these oscillations were examined. In addition to adding these controls to the piezo scanner, the removal rate was considerably improved by independently controlling the gain of the up-and-down motion based on the electrical discharge state of the high-resistance surface. Furthermore, to transmit rotation to the oscillation tool electrode, a magnetic non-contact transfer drive was utilized. Using this combination of controls, we effectively improved the removal rate in micro-hole machining.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122255274","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":"Investigation of Machining Characteristics of Micro-EDM with Ultrasonically Vibrated Machining Fluid under Ultra-small Discharge Energy","authors":"T. Ichikawa, W. Natsu","doi":"10.2526/IJEM.18.1","DOIUrl":"https://doi.org/10.2526/IJEM.18.1","url":null,"abstract":"Micro-EDM has its potential in the manufacture of micro tools and parts. However, the machining speed is low owing to short circuit and abnormal discharge, because of the difficulty in removing debris from the narrow gap-width. In particular, hole drilling becomes impossible under ultrasmall discharge energy conditions, such as the low open voltage and stray capacitance in the RC discharge circuit. In this study, the effect of applying ultrasonic vibration to the machining fluid in micro-EDM was experimentally investigated, in order to realize a higher machining speed in the deep hole drilling process. Furthermore, the effects of vibration on the machining characteristics of micro-hole drilling under the ultrasmall discharge energy condition were investigated. It was found that a significant increase in machining speed was realized by applying ultrasonic vibration to the machining fluid. Also, with the application of vibration to the machining fluid, micro-hole drilling with ultrasmall discharge energy became possible. Additionally, experimental results show that the lateral gap-width between the tool electrode and the workpiece, as well as and the tool wear ratio, became smaller.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133989797","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":"Influence of Polarization Plane on Groove Shape in Scribing of Sapphire by THG:YAG Laser","authors":"Y. Okamoto, S. Nakashiba, T. Sakagawa, A. Okada, Y. Uno","doi":"10.2526/IJEM.18.49","DOIUrl":"https://doi.org/10.2526/IJEM.18.49","url":null,"abstract":"Scribing characteristics of mono-crystalline sapphire by using THG:YAG laser of 355 nm in wavelength were experimentally investigated. The influence of polarization plane of laser beam on the curved shape at the tip of groove was also discussed. Moreover, the reflection of laser beam was experimentally investigated in order to clarify the generation mechanism of curved shape.The absorptivity of laser beam at high pulse repetition rate was still kept at higher order, although the feed rate became high. Therefore, the high pulse repetition rate condition is very effective for the laser scribing of sapphire.The curved shape at the tip of groove was greatly influenced by the direction of polarization plane of laser beam. This phenomenon occurred not randomly but regularly depending on the angle of polarization plane. The laser beam was reflected strongly in the direction of curved shape generation, in other words, in the vertical direction to the polarization plane of laser beam,. Therefore, the reflection of laser beam from the processing point has a close relation to the curved shape at the tip of the groove. As a result, a suitable setting of polarization plane could make the straight groove without the occurrence of curved shape.Scribing characteristics of mono-crystalline sapphire by using THG:YAG laser of 355 nm in wavelength were experimentally investigated. The influence of polarization plane of laser beam on the curved shape at the tip of groove was also discussed. Moreover, the reflection of laser beam was experimentally investigated in order to clarify the generation mechanism of curved shape.The absorptivity of laser beam at high pulse repetition rate was still kept at higher order, although the feed rate became high. Therefore, the high pulse repetition rate condition is very effective for the laser scribing of sapphire.The curved shape at the tip of groove was greatly influenced by the direction of polarization plane of laser beam. This phenomenon occurred not randomly but regularly depending on the angle of polarization plane. The laser beam was reflected strongly in the direction of curved shape generation, in other words, in the vertical direction to the polarization plane of laser beam,. Therefore, the reflection of...","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130133864","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":"Electrical Discharge Truing for Electroplated Diamond Tool : The Effect of EDM Condition and Electrode Material","authors":"Koji Watanabe, H. Minami, K. Masui","doi":"10.2526/IJEM.18.9","DOIUrl":"https://doi.org/10.2526/IJEM.18.9","url":null,"abstract":"This paper describes a new electrical discharge truing (ED-truing) method for an electroplated diamond tool. This new ED-truing method can straighten a conventional electroplated diamond tool by EDMing the tips of diamond grains, which have no electrical conductivity. The appropriate EDM conditions and the electrode material for ED-truing of the electroplated diamond tool are discussed. A grinding test using the ED-trued diamond tool is also examined. It is found that a short discharge pulse is effective in EDMing diamond grains. Moreover, it is found that a Cu-W alloy electrode, which can form a conductive carbon layer uniformly on the diamond surface, is suitable for the ED-truing. It is also confirmed that there is almost a 70% reduction in surface roughness as a result of ED-truing the electroplated diamond tool.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122863350","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":"Fabrication of Tungsten Carbide Alloy Micro-pin with Environment-Responsive ECM","authors":"N. Shibuya, W. Natsu","doi":"10.2526/IJEM.17.35","DOIUrl":"https://doi.org/10.2526/IJEM.17.35","url":null,"abstract":"","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122713049","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}