本文選題：激光織構(gòu) + 缸孔-活塞環(huán)�。� 參考：《江蘇大學(xué)》2016年碩士論文

【摘要】：缸孔-活塞環(huán)摩擦副系統(tǒng)是發(fā)動(dòng)機(jī)中最為關(guān)鍵的摩擦副之一,其摩擦功耗占整個(gè)發(fā)動(dòng)機(jī)的50~60%。激光表面微織構(gòu)技術(shù)能夠有效改善缸孔-活塞環(huán)摩擦副的摩擦學(xué)性能,減少摩擦磨損,提高整機(jī)燃油效率,實(shí)現(xiàn)節(jié)能減排的效果。本文以某型號(hào)發(fā)動(dòng)機(jī)為研究對(duì)象,建立潤滑理論模型,數(shù)值模擬潤滑性能與織構(gòu)形貌參數(shù)的關(guān)系,為設(shè)計(jì)發(fā)動(dòng)機(jī)試驗(yàn)方案提供理論支撐,系統(tǒng)開展激光微織構(gòu)工藝試驗(yàn)研究,并進(jìn)行發(fā)動(dòng)機(jī)的倒拖與臺(tái)架對(duì)比驗(yàn)證性能試驗(yàn)。其主要內(nèi)容如下。首先,考慮時(shí)變效應(yīng)及缸內(nèi)氣體壓力變化對(duì)活塞環(huán)背壓的影響,建立微凹坑織構(gòu)化缸孔-活塞環(huán)潤滑理論模型。對(duì)數(shù)學(xué)方程進(jìn)行無量綱化處理,利用有限差分法進(jìn)行參數(shù)離散化,采用多重網(wǎng)格法求解離散后的雷諾方程,得到一個(gè)沖程全周期過程中缸孔-活塞環(huán)間的最小油膜厚度、無量綱摩擦力變化曲線,研究發(fā)現(xiàn)微凹坑深度與面積密度對(duì)摩擦副潤滑性能影響較大,優(yōu)化微凹坑幾何參數(shù)能夠顯著提高缸孔-活塞環(huán)的潤滑性能。然后,圍繞缸孔激光微織構(gòu)技術(shù),開展了三種系列工藝試驗(yàn)。其一,為最大程度發(fā)揮缸孔表面織構(gòu)形貌的優(yōu)勢,降低機(jī)械珩磨網(wǎng)紋形貌的干擾,減少發(fā)動(dòng)機(jī)機(jī)油耗,應(yīng)優(yōu)化缸孔前處理表面粗糙度參數(shù)值,開展缸孔前處理鏡面珩磨工藝試驗(yàn)研究。以五個(gè)缸孔表面關(guān)鍵參數(shù)為衡量指標(biāo)(Rz"f2μm,Ra"f0.2μm和Rpk"f0.15μm,Rk"f0.4μm,Rvk"f1μm),主要研究珩磨條粒度、珩磨壓力對(duì)缸孔表面粗糙度值的影響。珩磨條粒度與珩磨壓力對(duì)缸孔表面參數(shù)影響較大,得到優(yōu)化鏡面珩磨加工工藝參數(shù);其二,開展激光微織構(gòu)工藝試驗(yàn),揭示了激光工藝參數(shù)對(duì)微凹坑形貌的影響規(guī)律。結(jié)果表明,單脈沖能量、脈沖次數(shù)為關(guān)鍵加工參數(shù),不同材料、涂層和波長對(duì)微凹坑幾何參數(shù)的影響顯著;其三,為去除激光織構(gòu)產(chǎn)生的熔渣,減少發(fā)動(dòng)機(jī)磨合時(shí)間,避免因熔渣剝落造成的磨粒磨損,需對(duì)織構(gòu)后的缸孔進(jìn)行去除熔渣后處理工藝試驗(yàn)。以缸孔表面Rz為指標(biāo)參數(shù),采用四因素二水平正交試驗(yàn),確定合理的后處理工藝參數(shù)。最后,針對(duì)某型四缸汽油機(jī),加工三種不同缸孔織構(gòu)方案樣機(jī),進(jìn)行裝機(jī)后倒拖與臺(tái)架試驗(yàn)�？疾煳伎有蚊矃�(shù)對(duì)發(fā)動(dòng)機(jī)動(dòng)力性能、油耗性能影響。倒拖試驗(yàn)結(jié)果顯示,當(dāng)缸孔上止點(diǎn)與中部行程區(qū)域面積密度為10%時(shí),摩擦功耗表現(xiàn)出有益的效果。臺(tái)架點(diǎn)火試驗(yàn)表明,經(jīng)24小時(shí)機(jī)油耗對(duì)比,兩種織構(gòu)方案機(jī)油耗低于原機(jī),最大降幅達(dá)26.48%;發(fā)動(dòng)機(jī)萬有特性曲線看出,發(fā)動(dòng)機(jī)大部分工況下,三種織構(gòu)發(fā)動(dòng)機(jī)燃油耗低于原機(jī),激光織構(gòu)位置為上止點(diǎn)、行程中部區(qū)域,且微凹坑直徑為70μm、深度為4μm、面積密度為10%時(shí),瞬時(shí)工況的燃油耗最大降幅達(dá)15%。
[Abstract]:Cylinder hole-piston ring friction pair system is one of the most critical friction pairs in the engine, its friction power consumption accounts for 5060% of the whole engine. Laser surface microtexture technology can effectively improve the tribological performance of cylinder hole piston ring friction pair, reduce friction and wear, improve the fuel efficiency of the whole machine, and achieve the effect of energy saving and emission reduction. In this paper, a theoretical model of lubrication is established for a certain engine, and the relationship between lubrication performance and texture parameters is numerically simulated, which provides theoretical support for the design of engine test scheme. The experimental research on laser microtexture technology is carried out systematically. The performance test of the engine is compared with that of the bench. The main contents are as follows. Firstly, considering the influence of time-varying effect and the change of gas pressure in cylinder on the back pressure of piston ring, a theoretical model of micro-crater textured cylinder orifice and piston ring lubrication is established. The mathematical equation is dimensionless, the finite difference method is used to discretize the parameters, and the multigrid method is used to solve the discrete Reynolds equation. The minimum oil film thickness between the cylinder hole and the piston ring is obtained during the whole cycle of stroke. It is found that the depth and area density of micropits have a great influence on the lubrication performance of friction pairs. Optimizing the geometric parameters of micropits can significantly improve the lubrication performance of cylinder holes and piston rings. Then, three series of process tests were carried out around the cylinder hole laser microtexture technology. First, in order to maximize the advantages of the surface texture of cylinder hole, reduce the interference of mechanical honing mesh morphology and reduce engine oil consumption, the parameters of surface roughness should be optimized. Experimental study on honing process of pre-treatment mirror surface of cylinder hole is carried out. The effects of honing bar particle size and honing pressure on the surface roughness of cylinder bore were studied by using the key parameters of five cylinder holes (RZ "f 2 渭 m Ra" f 0.2 渭 m and Rpk "f 0.15 渭 m Rk" f 0.4 渭 m Rvk "f 1 渭 m),). The honing bar particle size and honing pressure have great influence on the surface parameters of cylinder hole and obtain the optimized processing parameters of mirror honing. Secondly the experiments of laser micro-texture technology are carried out to reveal the influence of laser processing parameters on the morphology of micro-pits. The results show that the single pulse energy and pulse number are the key processing parameters, and different materials, coatings and wavelengths have significant effects on the geometric parameters of the microcrater. Thirdly, in order to remove the slag produced by the laser texture and reduce the engine running-in time, To avoid abrasive wear caused by slag spalling, it is necessary to carry out post-treatment experiments on textured cylinder holes. Taking the cylinder hole surface Rz as the index parameter, four factors and two levels orthogonal test were used to determine the reasonable post-treatment process parameters. Finally, three different cylinder hole texture prototypes are processed for a four-cylinder gasoline engine, and the backward towing and bench test are carried out. The effect of microcrater shape parameters on engine dynamic performance and fuel consumption was investigated. The results of backward drag test show that the friction power consumption shows a beneficial effect when the area density between the upper stop point and the middle stroke area of the cylinder hole is 10. The bench ignition test shows that the fuel consumption of the two texture schemes is lower than that of the original engine after 24 hours' fuel consumption comparison, and the maximum decrease is 26.48. The engine characteristic curve shows that the fuel consumption of the three texture engines is lower than that of the original engine under most of the engine working conditions. When the laser texture is located at the upper stop point, the middle travel area is in the middle region, and the diameter of the microcrater is 70 渭 m, the depth is 4 渭 m, and the area density is 10, the maximum reduction of fuel consumption in the instantaneous working condition is 15%.
【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】：2016
【分類號(hào)】：TK406

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 周德生;平頂珩磨技術(shù)在缸孔加工中的應(yīng)用[J];汽車技術(shù);1984年01期

2 沈洪生,胡德炎;二汽東風(fēng)汽車6100發(fā)動(dòng)機(jī)缸孔的平頂珩磨[J];磨料磨具與磨削;1985年03期

3 葉宗茂;發(fā)動(dòng)機(jī)缸孔珩磨網(wǎng)紋角的測量[J];機(jī)械工人.冷加工;2002年07期

4 鄢國洪,郎靜;康明斯發(fā)動(dòng)機(jī)缸孔珩磨工藝的分析與改進(jìn)[J];工具技術(shù);2003年01期

5 任光怡;;缸孔平臺(tái)珩磨工藝及常見問題的解決[J];工具技術(shù);2007年10期

6 徐輝;;改進(jìn)發(fā)動(dòng)機(jī)缸孔珩磨質(zhì)量[J];金屬加工(冷加工);2008年03期

7 王之燁;;缸孔激光珩磨運(yùn)用的研究[J];現(xiàn)代車用動(dòng)力;2010年03期

8 陳國友;;發(fā)動(dòng)機(jī)缸孔變形試驗(yàn)及工藝分析[J];裝備維修技術(shù);2010年03期

9 高德錄;;平臺(tái)網(wǎng)紋珩磨——缸孔精加工的利器[J];汽車與配件;2011年19期

10 李建華;周躍鋼;王祖化;彭科國;李衛(wèi)國;;缸孔珩磨表面微觀質(zhì)量評(píng)定方法的制定及應(yīng)用[J];汽車技術(shù);2011年09期

相關(guān)會(huì)議論文 前8條

1 徐輝;;改進(jìn)發(fā)動(dòng)機(jī)缸孔珩磨質(zhì)量[A];2007年全國機(jī)電企業(yè)工藝年會(huì)《星火機(jī)床杯》工藝創(chuàng)新發(fā)展綠色制造節(jié)約型工藝有獎(jiǎng)?wù)魑目萍颊撐募痆C];2007年

2 方和杰;;發(fā)動(dòng)機(jī)缸孔平臺(tái)珩磨關(guān)鍵技術(shù)研究[A];江蘇省汽車工程學(xué)會(huì)第九屆學(xué)術(shù)年會(huì)論文集[C];2010年

3 司圣春;;鑄鐵缸體缸孔珩磨工藝及檢測技術(shù)探究[A];創(chuàng)新裝備技術(shù) 給力地方經(jīng)濟(jì)——第三屆全國地方機(jī)械工程學(xué)會(huì)學(xué)術(shù)年會(huì)暨海峽兩岸機(jī)械科技論壇論文集[C];2013年

4 繆紅燕;;發(fā)動(dòng)機(jī)缸孔磨損的分析及控制[A];重慶汽車工程學(xué)會(huì)2008年學(xué)術(shù)會(huì)議論文集[C];2008年

5 張守鵬;喬公新;張雷;劉仰銀;;缸孔對(duì)主軸承孔位置偏差分析與對(duì)策[A];戰(zhàn)略性新興產(chǎn)業(yè)與科技支撐——2012年山東省科協(xié)學(xué)術(shù)年會(huì)論文集[C];2012年

6 鄒榮劍;;缸孔黑點(diǎn)缺陷的原因分析及解決措施[A];2009中國鑄造活動(dòng)周論文集[C];2009年

7 鄒榮劍;王順安;;缸孔黑點(diǎn)缺陷產(chǎn)生的原因分析及解決措施[A];重慶市機(jī)械工程學(xué)會(huì)鑄造分會(huì)、重慶鑄造行業(yè)協(xié)會(huì)2010重慶市鑄造年會(huì)論文集[C];2010年

8 張效工;李建華;;滿足更高排放法規(guī)的新結(jié)構(gòu)內(nèi)燃機(jī)[A];2007年APC聯(lián)合學(xué)術(shù)年會(huì)論文集[C];2007年

相關(guān)重要報(bào)紙文章 前2條

1 達(dá)罕;研成氣缸孔珩磨柔性生產(chǎn)線[N];中國汽車報(bào);2000年

2 熊焰;割草機(jī)的發(fā)動(dòng)機(jī)翻新[N];中國花卉報(bào);2005年

相關(guān)博士學(xué)位論文 前1條

1 徐玉梁;正向工程中車用柴油機(jī)缸孔變形的研究[D];天津大學(xué);2009年

相關(guān)碩士學(xué)位論文 前10條

1 羅春;汽油機(jī)缸孔變形研究[D];清華大學(xué);2014年

2 王林森;激光微織構(gòu)發(fā)動(dòng)機(jī)缸孔表面的潤滑理論與試驗(yàn)研究[D];江蘇大學(xué);2016年

3 高羅輝;汽車發(fā)動(dòng)機(jī)缸孔珩磨誤差分析與精度控制[D];上海交通大學(xué);2013年

4 韓昌滿;缸孔珩磨工藝的發(fā)展與應(yīng)用[D];哈爾濱工程大學(xué);2006年

5 趙玉祥;發(fā)動(dòng)機(jī)缸孔精密加工過程控制與優(yōu)化[D];上海交通大學(xué);2014年

6 肖鐵忠;汽車發(fā)動(dòng)機(jī)氣缸體缸孔雙軸精密數(shù)控加工設(shè)備研究[D];重慶理工大學(xué);2013年

7 王芳;柴油發(fā)動(dòng)機(jī)缸體缸孔精加工工藝試驗(yàn)研究[D];天津大學(xué);2014年

8 楊劍;氣缸孔變形及其對(duì)發(fā)動(dòng)機(jī)的影響研究[D];上海交通大學(xué);2008年

9 孫玉民;發(fā)動(dòng)機(jī)缸孔表面缺陷自動(dòng)檢測系統(tǒng)的研究[D];長春理工大學(xué);2007年

10 王福偉;發(fā)動(dòng)機(jī)氣缸體珩磨工藝的研究[D];吉林大學(xué);2012年

，

本文編號(hào)：2050174