Fabrication of Micro Flat Drills by Precision Grinding and Drilling into Duralumin and Stainless Steel with Ultrasonic Vibration(<Special Issue>Advanced Manufacturing Technology)
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概要
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The present paper deals with the fabrication of micro flat drills by precision grinding and their application to the drilling into duralumin and stainless steel without/with ultrasonic vibration on a vertical grinding/drilling machine. It is found from drill fabrication test that, by choosing grinding procedure of workpieces so that the stiffness may be kept as high as possible, the diameters range from 18 to 21μm for a nominal diameter of 20μm, and that precision measurement of the diameter after grinding of drill periphery and the precision positioning enabled us to fabricate a flat drill of minimum diameter 10.8μm. But, web eccentricity must be improved hereafter. From drill life test it is found that, irrespective of the existence of web taper, the drills without back taper showed longer tool life, and that irrespective of back taper, longer drill life was obtained in case of drills with web taper. This fact suggests that the stiffness at the root of a drill is very important for drill life. In duralumin longer drill life are gained without ultrasonic vibration than with ultrasonic vibration, and in stainless steel vice versa. Burr grows significantly with the increase in number of holes, but roundness of drilled holes is roughly good.
- 一般社団法人日本機械学会の論文
- 2004-03-15
著者
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Haketa Akira
日本大学 医学部内科学系腎臓高血圧内分泌内科
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Hata Akira
千葉大学 医学研究院公衆衛生学
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Hata A
Chiba Univ. Graduate School Of Medicine Chiba Jpn
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Hata Akira
Laboratory For Gastrointestinal Diseases Snp Research Center Riken
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Hata Akira
Department Of Public Health Chiba University Graduate School Of Medicine
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Hata Akira
Division Of Internal Medicine Toyonaka Municipal Hospital
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ONIKURA Hiromichi
Faculty of Engineering, Kyushu University
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Onikura Hiromichi
Faculty Of Engineering Kyushu University
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Yamamoto Kenichiro
Faculty Of Engineering Kyushu University
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Hata A
Laboratory For Gastrointestinal Diseases Snp Research Center Riken
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Hata Akira
Disco Corporation
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OHNISHI Osamu
Faculty of Engineering, Kyushu University
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Ohnishi Osamu
Faculty Of Engineering Kyushu University
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