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  本文選題：薄板微成形 + 摩擦尺寸效應(yīng)�。� 參考：《哈爾濱工業(yè)大學(xué)》2011年碩士論文

【摘要】：微成形中摩擦尺寸效應(yīng)的存在,給微成形加工工藝帶來(lái)許多不利影響。本文針對(duì)薄板微成形摩擦尺寸效應(yīng)進(jìn)行了系統(tǒng)研究,構(gòu)建了考慮尺寸效應(yīng)的理論模型,揭示了摩擦尺寸效應(yīng)產(chǎn)生機(jī)理;基于DLC薄膜,進(jìn)行了金箔微筒形件拉深實(shí)驗(yàn),并分析了DLC薄膜的磨損性能。 通過(guò)滑動(dòng)實(shí)驗(yàn)對(duì)不同尺寸的T2紫銅薄板在液體潤(rùn)滑的條件下進(jìn)行摩擦系數(shù)的測(cè)量,研究了接觸條件對(duì)摩擦系數(shù)的影響規(guī)律。結(jié)果表明,摩擦尺寸效應(yīng)即摩擦系數(shù)隨試樣尺寸減小而增加的幅度隨實(shí)際接觸面積比例的增加而增大;隨模具表面粗糙度的增加而減小;隨正壓力的增加而略有減小;隨滑動(dòng)速度的增加而略有減小。 基于庫(kù)倫定律,考慮液體潤(rùn)滑和非潤(rùn)滑區(qū)域比例,建立了考慮尺寸效應(yīng)的薄板微成形摩擦模型,分析表明,隨著尺度系數(shù)的減小真實(shí)接觸面積增加,從而出現(xiàn)摩擦尺寸效應(yīng)現(xiàn)象;基于Wanheim/Bay通用摩擦模型對(duì)所建立的理論計(jì)算模型修正,將其應(yīng)用到體積成形過(guò)程中。 基于所建立的考慮尺寸效應(yīng)的薄板微成形摩擦模型,采用Abaqus有限元軟件,實(shí)現(xiàn)微成形過(guò)程的數(shù)值模擬計(jì)算。通過(guò)對(duì)不同尺度系數(shù)下的微拉深過(guò)程的數(shù)值模擬計(jì)算表明,尺度系數(shù)較小時(shí)由于摩擦較大,容易出現(xiàn)拉深破裂現(xiàn)象。 利用在表面制備DLC薄膜的落料拉深復(fù)合模具進(jìn)行了T2紫銅箔和金箔微筒形件拉深成形實(shí)驗(yàn),并以PE薄膜潤(rùn)滑作為對(duì)比,研究了不同潤(rùn)滑條件對(duì)微筒形件表面質(zhì)量、成形精度和拉深成形力的影響。并利用AFM和Raman光譜對(duì)DLC薄膜的磨損進(jìn)行機(jī)理分析,結(jié)果表明在磨損過(guò)程中DLC薄膜發(fā)生相轉(zhuǎn)變和氫含量的升高。
[Abstract]:The existence of friction size effect in micro forming has brought many adverse effects to micro forming process. In this paper, the friction dimension effect of thin plate microforming is studied systematically, the theoretical model considering dimension effect is constructed, the mechanism of friction dimension effect is revealed, and the drawing experiment of gold foil microcylinder part is carried out based on DLC thin film. The wear properties of DLC films were analyzed. The friction coefficient of T2 copper sheet with different sizes under liquid lubrication was measured by sliding experiment, and the influence of contact conditions on friction coefficient was studied. The results show that the friction size effect, that is, the friction coefficient increases with the increase of the actual contact area ratio, decreases with the increase of the surface roughness of the die, and decreases slightly with the increase of the positive pressure. It decreases slightly with the increase of sliding velocity. Based on Coulomb's law and considering the ratio of liquid lubrication to non-lubricating region, the friction model of thin plate microforming considering size effect is established. The analysis shows that the real contact area increases with the decrease of scale coefficient. Based on the Wanheim/Bay general friction model, the theoretical calculation model is modified and applied to the bulk forming process. Based on the friction model of thin plate microforming considering size effect, the numerical simulation of micro-forming process is realized by using Abaqus finite element software. The numerical simulation of the micro-drawing process under different scale coefficients shows that the small scale coefficient is easy to appear the phenomenon of deep drawing fracture because of the large friction. The drawing experiments of T2 purple copper foil and gold foil microcylindrical parts were carried out by using the blanking and drawing compound die with DLC thin film on the surface. The surface quality of the microcylindrical parts under different lubrication conditions was studied by using PE film lubrication as a comparison. The influence of forming precision and drawing forming force. The wear mechanism of DLC thin films was analyzed by AFM and Raman spectra. The results showed that the phase transition and the increase of hydrogen content occurred in DLC films.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH117.1

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