2022 Fiscal Year Final Research Report
Effect of Gap Atmosphere on the Forming Accuracy of Electrode Tools for Deep Hole Drilling of Micro Diameter
| Project/Area Number |
19K04122
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 18020:Manufacturing and production engineering-related
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| Research Institution | Niigata University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 放電加工 / 深穴加工 / 微細加工 / 軸成形 |
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| Outline of Final Research Achievements |
The purpose of this research is to realize Deep hole drilling of small diameter by forming a micro-axis on the small machine and using the formed axis as an Electrode. We proposed a micro shaft forming method in which the electrode is rotated while scanning electrical discharge machining is performed toward the work piece, and achieved shaft forming with a diameter of 10μm，L/D25.In order to improved the accuracy of formed shaft diameter, the diameter of the discharge trace and the distance between discharged gaps were measured for different electrical energies, and by selecting the optimum electrical energy conditions more accurate shaft forming was achieved.The relationship between shaft diameter and resonance was simulated and compared with actual results.
By using a condition where the shaft does not resonate, the accuracy of shaft forming was improved.
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| Free Research Field |
加工学
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| Academic Significance and Societal Importance of the Research Achievements |
エンジン燃料噴射ノズルの噴射穴は，金属材料に対してアスペクト比(深さ/穴径の比：Ｌ/Ｄ)が5を越え，かつミクロンオーダの精度を必要とする．また最近では，多様化するエンジン燃焼方式の影響で，斜め穴，異形穴など，穴形状に対する要求も多様化している．成形した工具電極を用いることで微細な高アスペクト比の深穴加工を実現することは，工業的な価値は大きい．例えば，直径0.2mm以下の加工穴やノズル穴の複雑形状加工が実用化すれば，工業的にも計り知れない価値があり，社会的意義は大きい．
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