| Project/Area Number |
14350075
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
機械工作・生産工学
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| Research Institution | Tokyo Denki University |
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Principal Investigator |
SHIRAKASHI Takahiro Tokyo Denki Univ., Dept.Engineering, Prof., 工学部, 教授 (50016440)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUMURA Takashi Tokyo Denki Univ., Dept.Engineering, Prof., 工学部, 教授 (20199855)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥10,500,000 (Direct Cost: ¥10,500,000)
Fiscal Year 2003: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2002: ¥7,600,000 (Direct Cost: ¥7,600,000)
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| Keywords | machining / brittle material / brittle fracture / crack generation / fracture toughness / machining fluids / ion absorption / surface energy / 亀裂進展 / ガラス / 無損傷機械加工 / 亀裂発生進展 / 加工油剤 / 破壊応力 |
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| Research Abstract |
A brittle crack generation and its propagation are discussed in machining process of brittle materials, and the restrain/control method of crack propagation is also discussed. In order to clarify a mechanical feature of a chip formation process in glass machining, the process is simulated by FEM. A flow type chip without defect can be seen under a fine cutting condition. A transition from a crack type chip formation to a flow type one is also simulated through FEM introducing a probabilistic fracture criterion. A crack generation and its propagation pass in a work are greatly dependent with a depth of cut. A defect free chip generation process can be also seen under a fine cutting condition. The effects of environment on mechanical characteristics of the brittle materials are quantitatively discussed. A fracture stress of the materials are greatly affected by special ions in machining fluids and the ion gives a fine finishing surface, but the fracture stress decreases of machined work in the ion. Since a surface energy or fracture toughness of brittle material affects greatly on crack generation/propagation, the new methods to control the toughness are discussed, where the special ion is absorbed in a crack tip. Finally a micro NC machine for micro/nano machining on brittle materials is constructed and its performance is examined, where a defect free machining is possible.
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