{"title":"High Quality Laser Dicing of Semiconductor Package with a Single-mode Q-switched Fiber Laser","authors":"R. Kitada, Y. Okamoto, Y. Uno, Takuya Ikeda","doi":"10.2526/ijem.15.33","DOIUrl":"https://doi.org/10.2526/ijem.15.33","url":null,"abstract":"Recently, the laser dicing has been expected as a new dicing method because of its high flexibility. However, the reduction of heat affected zone is strongly required in order to prevent the deterioration of semiconductor devices due to heat damage. From this point of view, high quality dicing method for semiconductor package by a single-mode Q-switched fiber laser was experimentally investigated using cooled assist gas for reducing the heat affected zone. It is clarified that the combination of nitrogen assist gas in the coaxial direction of laser beam and cooled assist gas from the rear side of cutting direction led to the better cutting results with low heat affected zone.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"20 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113942266","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":"The Electrical Machining Processes-What Demands will they Face in the Future?","authors":"W. König, F. Klocke, R. Lenzen","doi":"10.2526/ijem.1.3","DOIUrl":"https://doi.org/10.2526/ijem.1.3","url":null,"abstract":". In many areas, the electrical machining processes face competition from other production processes. If they are to remain viable, they must address themselves to the requirements which will be determined primarily by future products. In addition to the economical aspects which always apply, these require ments also cover new materials, miniaturisation, high environmental compatibility and fast and reliable manufacture.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"48 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":"126456434","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":"Electro Chemical Machining with Oscillating Tool Electrode : Estimation of Maximum Pressure","authors":"T. Böhlke, R. Forster","doi":"10.2526/ijem.11.9","DOIUrl":"https://doi.org/10.2526/ijem.11.9","url":null,"abstract":"The optimal design of Electro Chemical Machining (ECM) processes is of significant technological importance. In the present work ECM processes with an oscillating tool electrode are considered. It is motivated by the fact that the workpiece electrode may suffer damage or may even fail if the applied load due to hydrodynamic forces is too large. A simple formula is developed for the reaction force acting on the tool electrode. The formula depends on the geometrical, the material and the process parameters. The predictions of the mechanical model are compared with experimental results.","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":"134040437","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 of Surface Modification by Electrical Discharge Machining","authors":"M. Sano, K. Yatsushiro, K. Okada, M. Hihara","doi":"10.2526/ijem.12.9","DOIUrl":"https://doi.org/10.2526/ijem.12.9","url":null,"abstract":"* Yamanashi pref. Industrial technology center, Yamanashi, 400-0055, Japan ** Yamanashi University, Yamanashi, 400-8511, Japan *** Uddehorm K.K., Tokyo, 105-0003 ,Japan Abstract In this study we attempted to produce a high-quality surface through the use of Electrical Discharge Machining (EDM). We confirmed the formation of a hardened layer upon mixing Ti powder into the dielectric working fluid. However, surface roughness increased on the treated surface. In this experiment, we applied this treatment to a die having a complicated shape. Some characteristics of the layer modified by EDM were evaluated by surface roughness measurement, X-ray diffraction analysis, and SEM observation. The following results were obtained: 1) Although surface roughness was improved by finishing EDM after surface modification, surface hardness decreased only slightly, 2) When applying scanning EDM, it was evident that a modified layer formed on the surface, 3) When these surface modifications were applied to a metal stamping die for the production ofjewelry, a uniform modified layer was formed over the machined surface. 4) When heat treatment over 600°C was applied to a modified layer, its toughness increased, the hardness of the surface decreased.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"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":"134555255","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 micro-rods using electrolyte jet turning method","authors":"W. Han, M. Kunieda","doi":"10.2526/ijem.25.38","DOIUrl":"https://doi.org/10.2526/ijem.25.38","url":null,"abstract":"The electrolyte jet turning (EJT) method was used to fabricate tungsten micro-rods with the neutral sodium nitrate (NaNO 3 ) aqueous solution as electrolyte. Since the non-conductive oxide film generated on the surface of tungsten interrupts the electrochemical dissolution process, a bipolar current was needed to remove the oxide film during machining. With the bipolar current, sodium hydroxide (NaOH) is generated, when the polarity of the tungsten electrode is negative, enabling the removal of oxide film. A cylindrical nozzle was used for the EJT to jet electrolyte to the surface of workpiece which was rotated with a rotation speed of 3000 rpm. The inner diameter of the cylindrical nozzle determined the diameter of the electrolyte jet, and its influence on the machining characteristics was investigated first. Then, the influences of the duty factor and frequency of pulse voltage on the machining process were investigated to improve the machining accuracy. Finally, tungsten micro-rods with high aspect ratio were fabricated by translating the electrolyte jet on the surface of rod workpiece.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"14 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":"132808821","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":"Review on Recent Research in Electrochemical Machining Using Ultra Short Pulses","authors":"Kim Bo Hyun, Chu Chong Nam","doi":"10.2526/ijem.12.1","DOIUrl":"https://doi.org/10.2526/ijem.12.1","url":null,"abstract":"Recently, the use of ultra short pulses of nanosecond duration has changed ECM into promising technology with nanometer resolution. This paper reviewed recent research in nano/micro ECM using ultra short voltage pulses. The mechanism of the process is described and machining parameters, including electrolyte and pulse conditions, are discussed. Applications of micro ECM such as electrochemical drilling, electrochemical milling and wire ECM are described. Machining samples of nano and micro ECM are also presented.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"46 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":"133432590","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}
Z. Wansheng, L. Weidong, Di Shichun, Wang Zhenlong
{"title":"Research on Miniaturized Direct Drive Mechanism of EDM Electrode Using Linear Ultrasonic Motors","authors":"Z. Wansheng, L. Weidong, Di Shichun, Wang Zhenlong","doi":"10.2526/ijem.4.29","DOIUrl":"https://doi.org/10.2526/ijem.4.29","url":null,"abstract":"This paper deals with an electrode direct drive device for Electrical Discharge Machining (EDM) utilizing a dual stator linear ultrasonic motor. The stepping feed and moving direction of the electrode are controlled by the ultrasonic motor. Through changing moving direction of the electrode quickly, the coaxial vibration of the electrode is generated and it enhances the evacuation of debris, thereby improves the machining speed. The dimension of the mechanism is 45 mm x 20 mm x 40 mm. Machining test verifies that the new device is suitable for small hole EDM drilling.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"8 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":"131320516","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. Okamoto, Akira Eguchi, N. Maeda, A. Okada, S. Minagi, Qiuyue Pan, Keiji Jin, G. Nishigawa
{"title":"Study on Reduction of Discoloration Area in Micro-drilling of Multi-layered Artificial Skin by Picosecond Pulsed Laser","authors":"Y. Okamoto, Akira Eguchi, N. Maeda, A. Okada, S. Minagi, Qiuyue Pan, Keiji Jin, G. Nishigawa","doi":"10.2526/IJEM.22.8","DOIUrl":"https://doi.org/10.2526/IJEM.22.8","url":null,"abstract":"","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"1 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":"133744617","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":"Processing of Transparent and Dielectric Materials with Deep UV-and VUV Excimer Laser Radiation","authors":"H. Tönshoff, A. Ostendorf, K. Körber, T. Temme","doi":"10.2526/ijem.6.27","DOIUrl":"https://doi.org/10.2526/ijem.6.27","url":null,"abstract":"In this paper, technologies will be presented for precise machining of transparent and dielectric materials with excimer laser radiation. This includes already established techniques with 248 nm KrF excimer lasers, as well as the less common deep UV 193 nm processing with ArF lasers for brittle and transparent materials. Furthermore, first investigations have been carried out in order to shape materials with a high transparency in the UV, like fused silica or polytetrafluorine (PTFE) by using the VUV wavelength 157 nm of an F2 excimer laser.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"58 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":"124177940","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}
A. Ruszaj, Zybura-Skrabalak Maria, M. Chuchro, A. Mleczek
{"title":"Investigations Aiming at Working Out the CAD/CAM System for Electrochemical Grinding with Spherical Abrasive Tool","authors":"A. Ruszaj, Zybura-Skrabalak Maria, M. Chuchro, A. Mleczek","doi":"10.2526/ijem.5.35","DOIUrl":"https://doi.org/10.2526/ijem.5.35","url":null,"abstract":"One of the main advantages which offers manufacturing with universal tools is the high level of flexibility. In case of electrochemical or electrochemical abrasive machining the additional advantage is a good quality of surface layer. In order to make the technological process design more efficient investigations aiming at working out the CAD/CAM system have been undertaken. Some results of these investigations in the field of electrochemical grinding with spherical abrasive tool surfaces after rough milling will be presented in the paper.","PeriodicalId":407646,"journal":{"name":"International Journal of Electrical Machining","volume":"125 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":"117104289","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}