| Project/Area Number |
16560121
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Design engineering/Machine functional elements/Tribology
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| Research Institution | Kagawa University |
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Principal Investigator |
WAKABAYASHI Toshiaki Kagawa University, Faculty of Engineering, Professor, 工学部, 教授 (00294736)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2005: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2004: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | ENVIRONMENTALLY FRIENDLY / MACHINING / TRIBOLOGY / ECO-MACHINING / MQL MACHINING / NEAR-DRY MACHINING / CUTTING / CUTTING FLUID / 合成エステル / 潤滑剤 / セミドライ加工 |
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| Research Abstract |
The purpose of this study is to understand the action mechanism of synthetic ester lubricants suitable for MQL machining by investigating their tribological characteristics and cutting performance. The main results and conclusions of this study are as follows.
1. Tribological characteristics evaluation of synthetic esters
According to a survey of suitable esters for MQL machining, this study investigated the lubricating characteristics of those esters by a basic friction test and found that an ester having more ester bonds in one molecule showed the better lubricity and such trend was prominent at higher sliding speed.
2. Evaluation of cutting performance by practical MQL machining tests
The practical MQL machining of alloy steels by turning illustrated an ester showing the better lubricity provided the higher cutting performance. The turning tests of some stainless steels categorized as a difficult-to-cut material also demonstrated that MQL machining could improve the tool life and, in the range of low cutting speeds, could decrease the cutting resistance. Further, MQL end-milling of an aluminum alloy presented superior surface finish roughness to that obtained by dry and air blow end-milling operations.
3. Influences of adsorption characteristics on the lubricating behavior of esters
The investigation regarding the adsorption behavior of various gases onto nascent metal surfaces verified that the adsorbing action of oxygen is most dominant and, if oxygen and an ester existed together, the lubricating film formed by their adsorption could reveal the action resulted from both the oxide and a part derived from the ester. sing a controlled atmospheres cutting apparatus, In addition, the adsorption of oxygen provided a preferable influence on cutting steel, whereas it caused low performance when cutting aluminum alloy.
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