發(fā)布時(shí)間：2018-06-04 23:49

  本文選題：油基納米流體 + 摩擦學(xué)性能��； 參考：《江蘇科技大學(xué)》2016年碩士論文

【摘要】：微量潤(rùn)滑因極大限度地減少了切削液的使用及良好的切削加工性能而成為一種普遍關(guān)注的冷卻潤(rùn)滑技術(shù)。然而其冷卻潤(rùn)滑性能尚不能滿足高效加工的高要求,并且在切削環(huán)境中易引起較高的油霧濃度。為提高冷卻潤(rùn)滑性能和改善切削環(huán)境,本文提出開展微量油基納米流體靜電霧化切削潤(rùn)滑性能及機(jī)理研究。主要研究工作如下:(1)切削用納米流體的分散性與熱物性采用兩步法制備了以石墨、多壁碳納米管和金剛石為納米顆粒,以切削用LB2000植物性潤(rùn)滑油為基液的油基納米流體。研究了體積分?jǐn)?shù)、振動(dòng)時(shí)間、納米顆粒尺寸和種類對(duì)納米流體粒徑分布、粘度、表面張力及導(dǎo)熱系數(shù)的影響,發(fā)現(xiàn)了上述因素對(duì)納米流體分散性和熱物性的影響規(guī)律,為其在切削加工中的選用提供理論依據(jù)。(2)油基納米流體摩擦學(xué)性能在瑞士CSM公司制造的銷-盤摩擦磨損試驗(yàn)機(jī)上,進(jìn)行油基納米流體摩擦性能試驗(yàn),發(fā)現(xiàn)添加納米石墨與碳納米管可以顯著提高基礎(chǔ)油的減摩性和抗磨性,結(jié)合構(gòu)建的摩擦學(xué)模型與鈦合金盤表面磨痕形貌及能譜分析,揭示了納米石墨與碳納米管作為L(zhǎng)B2000植物性潤(rùn)滑油添加劑的潤(rùn)滑機(jī)理。(3)靜電霧化切削的靜電場(chǎng)有限元仿真在靜電霧化切削構(gòu)想基礎(chǔ)上,利用Ansoft Maxwell軟件建立了靜電霧化切削的靜電場(chǎng)有限元模型,分析了噴嘴角度、電極電壓、電極間距和噴嘴結(jié)構(gòu)對(duì)靜電場(chǎng)強(qiáng)度的影響,獲得了靜電場(chǎng)強(qiáng)度隨上述因素的變化規(guī)律及優(yōu)化的噴嘴角度與噴嘴結(jié)構(gòu),為進(jìn)行靜電霧化切削試驗(yàn)提供理論依據(jù)。(4)微量納米流體靜電霧化切削試驗(yàn)構(gòu)建了靜電霧化切削系統(tǒng),開展了不同冷卻潤(rùn)滑條件下的鈦合金銑削試驗(yàn)與切削環(huán)境油霧濃度檢測(cè),分析了冷卻潤(rùn)滑條件對(duì)刀具磨損和油霧濃度的影響。試驗(yàn)結(jié)果表明,相對(duì)于微量潤(rùn)滑切削而言,微量油基納米流體靜電霧化切削不僅有效地降低了刀具磨損,而且明顯改善了切削環(huán)境空氣質(zhì)量。
[Abstract]:Micro lubrication has become a widely concerned cooling lubrication technology due to its reduced use of cutting fluid and good machining performance. However, its cooling and lubricating performance can not meet the high requirement of high efficiency machining, and it is easy to cause high concentration of oil mist in cutting environment. In order to improve the cooling lubricity and the cutting environment, the lubrication performance and mechanism of micro oil based nano fluid electrostatic atomization cutting were studied in this paper. The main research work is as follows: (1) the dispersity and thermal properties of nano-fluids used in cutting were prepared by two-step method. The oil-based nano-fluids were prepared using graphite, multi-walled carbon nanotubes and diamond as nanoparticles and LB2000 vegetable lubricating oil as the base solution for cutting. The effects of volume fraction, vibration time, size and type of nanoparticles on the particle size distribution, viscosity, surface tension and thermal conductivity of nano-fluids were studied. The tribological properties of oil based nano fluids were tested on a pin disk friction and wear tester made by CSM Company of Switzerland. It was found that the addition of nano-graphite and carbon nanotubes could significantly improve the antifriction and antiwear properties of base oil. The tribological model was combined with the wear trace morphology and energy spectrum analysis on the surface of titanium alloy disc. The lubrication mechanism of nano-graphite and carbon nanotube as LB2000 vegetable lubricating oil additive is revealed. The electrostatic field finite element simulation of electrostatic atomization cutting is based on the idea of electrostatic atomization cutting. The finite element model of electrostatic field in electrostatic atomization cutting is established by using Ansoft Maxwell software. The influence of nozzle angle, electrode voltage, electrode spacing and nozzle structure on electrostatic field intensity is analyzed. The variation law of electrostatic field intensity with the above factors and the optimized nozzle angle and nozzle structure are obtained. The electrostatic atomization cutting system is constructed for electrostatic atomization cutting test. The milling test of titanium alloy under different cooling lubrication conditions and the detection of oil fog concentration in cutting environment were carried out. The effects of cooling lubrication conditions on tool wear and oil fog concentration were analyzed. The experimental results show that compared with micro-lubricating cutting, micro-oil based nano-fluid electrostatic atomization cutting not only effectively reduces tool wear, but also obviously improves the air quality of cutting environment.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG501.5

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