發(fā)布時(shí)間：2018-04-09 01:17

  本文選題：摩擦　切入點(diǎn)：SUS304不銹鋼薄板　出處：《江蘇大學(xué)》2017年碩士論文

【摘要】：隨著高新技術(shù)和產(chǎn)業(yè)的興起,微系統(tǒng)技術(shù)和微機(jī)電系統(tǒng)備受青睞,促使微成形零部件等產(chǎn)品的需求量迅猛增長(zhǎng)。雖然薄板微塑性成形技術(shù)優(yōu)點(diǎn)突出,然而,因?yàn)榱悴考叽缥⑿』?材料的力學(xué)性能、成形機(jī)理呈現(xiàn)出明顯的尺度效應(yīng)。因此,傳統(tǒng)的板料塑性成形技術(shù)不能直接按比例縮小應(yīng)用于微成形中,而摩擦作為薄板塑性微成形研究熱門(mén)方向,各方面還有待進(jìn)一步完善。本文將SUS304不銹鋼超薄板作為試驗(yàn)對(duì)象,研究了材料力學(xué)性能尺度效應(yīng)以及各工藝參數(shù)對(duì)超薄板摩擦的影響規(guī)律,揭示了摩擦尺度效應(yīng)產(chǎn)生機(jī)理,探討了實(shí)際微拉深成形工藝的摩擦尺度效應(yīng)現(xiàn)象,主要研究?jī)?nèi)容有以下幾個(gè)方面:1)分別對(duì)不同規(guī)格超薄板開(kāi)展單拉試驗(yàn),結(jié)果顯示,當(dāng)超薄板厚度或者晶粒尺寸逐漸減小時(shí),其流動(dòng)應(yīng)力均隨之不斷上升,即“越小越強(qiáng)”力學(xué)性能尺度效應(yīng)現(xiàn)象顯著;基于表面鈍化膜強(qiáng)化作用、應(yīng)變梯度強(qiáng)化效應(yīng)、以及多晶體材料的細(xì)晶強(qiáng)化理論,闡述了力學(xué)性能尺度效應(yīng)機(jī)理,并分析了單拉斷口形貌。2)分別對(duì)不同厚度及不同晶粒尺寸的超薄板進(jìn)行了線性往復(fù)式球-盤(pán)摩擦試驗(yàn),結(jié)果表明,力學(xué)性能尺度效應(yīng)并未在很大程度上使摩擦系數(shù)發(fā)生變化。研究了工藝參數(shù)對(duì)不同尺寸超薄板摩擦系數(shù)的影響規(guī)律,通過(guò)磨痕形貌觀察及磨痕截面尺寸測(cè)量,其結(jié)果表明,在干摩擦條件下,超薄板的摩擦系數(shù)隨鋼球表面粗糙度增大而明顯上升,隨線性往復(fù)摩擦速度增大而緩慢下降,隨試樣表面粗糙度或摩擦載荷增加而緩慢上漲;工藝參數(shù)保持不變時(shí),厚度減薄沒(méi)有影響到鋼球和超薄板表面間的機(jī)械嚙合或分子吸引作用,即沒(méi)有表現(xiàn)出摩擦尺度效應(yīng)。3)采用圓柱銷-條形試樣接觸方式,對(duì)不同規(guī)格的條形超薄板進(jìn)行了線性往復(fù)式銷-盤(pán)摩擦試驗(yàn),結(jié)果表明,在液體潤(rùn)滑狀態(tài)下,條形超薄板的摩擦系數(shù)隨著寬度尺寸減小而明顯上升,摩擦尺度效應(yīng)現(xiàn)象顯著;基于摩擦形貌觀察和模型分析,揭示了摩擦尺度效應(yīng)機(jī)理。采用多尺度精密微矩形拉深模具,對(duì)條形超薄板開(kāi)展了微拉深成形,結(jié)果顯示,在液體潤(rùn)滑狀態(tài)下,當(dāng)試樣尺寸或模具尺度逐漸減小時(shí),摩擦力所占拉深成形力的比例增加,摩擦系數(shù)隨之增大,即摩擦尺度效應(yīng)對(duì)成形力的影響較為顯著。
[Abstract]:With the rise of high and new technology and industry, micro-system technology and micro-electromechanical system are favored, which makes the demand of micro-forming parts and other products grow rapidly.Although the advantages of sheet metal microplastic forming technology are outstanding, due to the miniaturization of the parts size, the mechanical properties of the material and the forming mechanism show obvious scale effect.Therefore, the traditional sheet metal plastic forming technology can not be directly reduced in proportion to the application in micro-forming, but friction as a hot research direction of thin plate plastic micro-forming, all aspects need to be further improved.In this paper, the scale effect of mechanical properties of SUS304 stainless steel sheet and the influence of various process parameters on friction of ultra-thin plate are studied, and the mechanism of friction scale effect is revealed.In this paper, the friction scale effect of the actual micro-drawing forming process is discussed. The main research contents are as follows: (1) A single tensile test is carried out on the ultra-thin sheet with different specifications. The results show that when the thickness or grain size of the ultra-thin plate decreases gradually,The flow stress increases continuously, that is, the "smaller and stronger" mechanical properties scale effect phenomenon is obvious, based on the surface passivation film strengthening effect, strain gradient strengthening effect, and the fine crystal strengthening theory of polycrystalline materials,The mechanism of the scale effect of mechanical properties is described, and the morphology of single tensile fracture. 2) the linear reciprocating ball disk friction tests of ultra-thin plates with different thickness and different grain size are carried out respectively. The results show that: 1.The scale effect of mechanical properties does not change the friction coefficient to a great extent.The influence of process parameters on friction coefficient of ultra-thin plates with different sizes is studied. The results show that under dry friction conditions, the friction coefficient of ultra-thin plates with different sizes is measured by observing the morphology of wear marks and measuring the cross section of wear marks.The friction coefficient of the ultra-thin plate increases obviously with the increase of the surface roughness of the steel ball, decreases slowly with the increase of the linear reciprocating friction velocity, and increases slowly with the increase of the surface roughness or friction load of the specimen.Thickness thinning does not affect the mechanical meshing or molecular attraction between the steel ball and the surface of the ultra-thin plate, that is, it does not show a friction scale effect .3) the cylindrical pin-strip specimen contact mode is adopted.The linear reciprocating pin-disk friction test was carried out on the strip ultra-thin plates with different specifications. The results show that the friction coefficient of the strip ultra-thin plates increases obviously with the decrease of the width and the friction scale effect is obvious under liquid lubrication.Based on the observation of friction morphology and model analysis, the mechanism of friction scale effect is revealed.The microdrawing forming of strip ultra-thin plate was carried out by using multi-scale precision micro-rectangular drawing die. The results showed that under liquid lubrication condition, when the sample size or die size gradually decreased, the proportion of friction force in drawing forming force increased.The friction coefficient increases, that is, the friction scale effect has a significant effect on the forming force.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG142.71;TG301

【相似文獻(xiàn)】

相關(guān)期刊論文 前6條

1 魏悅廣;固體尺度效應(yīng)宏微觀關(guān)聯(lián)理論和方法的研究進(jìn)展[J];中國(guó)科學(xué)基金;2000年04期

2 林鵬;唐春安;黃凱珠;周維垣;;脆性介質(zhì)中裂紋與孔洞缺陷的分類與尺度效應(yīng)[J];巖石力學(xué)與工程學(xué)報(bào);2002年S2期

3 林瓊;畢忠偉;梁政;;基于尺度效應(yīng)的灰?guī)r強(qiáng)度研究[J];中國(guó)安全生產(chǎn)科學(xué)技術(shù);2007年01期

4 畢忠余;熊日新;;灰?guī)r強(qiáng)度的尺度效應(yīng)研究[J];西部探礦工程;2007年02期

5 解海鷗;馬寒松;魏悅廣;;顆粒增強(qiáng)復(fù)合材料的界面開(kāi)裂與尺度效應(yīng)[J];固體力學(xué)學(xué)報(bào);2008年01期

6 房營(yíng)光;馮德鑾;馬文旭;谷任國(guó);何智威;;土體介質(zhì)強(qiáng)度尺度效應(yīng)的理論與試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);2013年11期

相關(guān)會(huì)議論文 前5條

1 李志信;過(guò)增元;;微細(xì)尺度流動(dòng)與傳熱尺度效應(yīng)的物理機(jī)制及其應(yīng)用[A];全球化、信息化、綠色化提升中國(guó)制造業(yè)——2003年中國(guó)機(jī)械工程學(xué)會(huì)年會(huì)論文集（微納制造技術(shù)應(yīng)用專題）[C];2003年

2 閔捷;張安錄;;農(nóng)地城市流轉(zhuǎn)驅(qū)動(dòng)機(jī)制的時(shí)空尺度效應(yīng)分析[A];節(jié)能環(huán)保 和諧發(fā)展——2007中國(guó)科協(xié)年會(huì)論文集（二）[C];2007年

3 高原;柳占立;趙雪川;莊茁;;亞微米尺度單晶柱體壓縮的尺度效應(yīng)研究[A];中國(guó)力學(xué)學(xué)會(huì)學(xué)術(shù)大會(huì)'2009論文摘要集[C];2009年

4 徐松林;鄭文;李廣場(chǎng);劉永貴;鄧向允;席道瑛;;巖體中彈性波傳播的尺度效應(yīng)的初步分析[A];巖石力學(xué)與工程的創(chuàng)新和實(shí)踐：第十一次全國(guó)巖石力學(xué)與工程學(xué)術(shù)大會(huì)論文集[C];2010年

5 高原;莊茁;;亞微米尺度單晶柱體壓縮的尺度效應(yīng)研究[A];北京力學(xué)會(huì)第十六屆學(xué)術(shù)年會(huì)論文集[C];2010年

相關(guān)重要報(bào)紙文章 前2條

1 屈創(chuàng)治;湖南大學(xué)發(fā)現(xiàn)納米尺度效應(yīng)[N];中國(guó)化工報(bào);2003年

2 ;科學(xué)家發(fā)現(xiàn)新的納米尺度效應(yīng)[N];今日信息報(bào);2003年

相關(guān)博士學(xué)位論文 前2條

1 倪九派;三峽庫(kù)區(qū)水土流失空間尺度效應(yīng)及其尺度轉(zhuǎn)換研究[D];西南農(nóng)業(yè)大學(xué);2005年

2 原波;高分子納米纖維及其結(jié)構(gòu)支架的力學(xué)性能研究與計(jì)算建模[D];復(fù)旦大學(xué);2009年

相關(guān)碩士學(xué)位論文 前1條

1 徐飛;不銹鋼超薄板微成形摩擦尺度效應(yīng)試驗(yàn)研究[D];江蘇大學(xué);2017年

，

本文編號(hào)：1724196