【摘要】：摩擦副的摩擦特性與其表面形貌密切相關(guān)，通過(guò)表面形貌的設(shè)計(jì)改變摩擦特性成為了近些年來(lái)科學(xué)研究的一個(gè)重點(diǎn)。發(fā)動(dòng)機(jī)連桿襯套的表面形貌不但對(duì)其本身的摩擦特性、磨損特性、成膜效果、耐腐蝕性等有較大的影響，而且與設(shè)備整體的運(yùn)轉(zhuǎn)性能、工作效率、振動(dòng)與噪聲的控制有密切的關(guān)系。因此改善表面形貌是延長(zhǎng)零件和設(shè)備壽命、提升運(yùn)轉(zhuǎn)性能的一個(gè)非常有效的渠道。 為了較好的控制連桿襯套在工況中的摩擦特性，研究人員在連桿襯套材質(zhì)的研發(fā)、潤(rùn)滑等方面做了大量的的研究工作，但是在表面形貌對(duì)摩擦磨損特性的影響上分析研究較少，本文就是在保證潤(rùn)滑充分且潤(rùn)滑條件不變的情況下，采用不同材料的連桿襯套研究表面形貌對(duì)摩擦特性的影響。 本文主要進(jìn)行了以下工作： (1)首先對(duì)眾多表面形貌參數(shù)的定義和意義進(jìn)行了分析研究，從大量的二維表面形貌參數(shù)選取部分具有功能特性的有效參數(shù)進(jìn)行分析。基于粗糙峰接觸和潤(rùn)滑，從大量的表面形貌參數(shù)中選擇7個(gè)具有功能特性的有效參數(shù)進(jìn)行分析。用JB-5C粗糙度輪廓儀采集連桿襯套表面形貌參數(shù)值，同時(shí)得出表面形貌圖。 (2)對(duì)連桿襯套進(jìn)行了摩擦特性試驗(yàn)，研究了表面形貌參數(shù)、速度、載荷、潤(rùn)滑、摩擦距離對(duì)摩擦特性的影響，得到了相應(yīng)的變化規(guī)律曲線，得出連桿襯套形貌變化與硬表面活塞銷(xiāo)表面形貌有關(guān)，，與自身初始形貌無(wú)關(guān)。 (3)基于BP神經(jīng)網(wǎng)絡(luò)MIV法對(duì)表面形貌參數(shù)進(jìn)行篩選。眾多表面形貌參數(shù)對(duì)摩擦特性的影響程度不同，研究不同表面形貌參數(shù)影響程度的大小至關(guān)重要。利用MATLAB中BP神經(jīng)網(wǎng)絡(luò)工具箱和MIV參數(shù)篩選法，以表面形貌參數(shù)對(duì)摩擦扭矩的平均影響值作為評(píng)價(jià)基準(zhǔn)進(jìn)行編程計(jì)算，將這些參數(shù)按重要程度進(jìn)行排序，從中選出對(duì)摩擦特性影響較大的參數(shù)作為表面形貌設(shè)計(jì)的關(guān)鍵依據(jù)，為以后通過(guò)改變連桿襯套表面形貌來(lái)改善摩擦特性奠定基礎(chǔ)。 (4)對(duì)不同材料的連桿襯套進(jìn)行摩擦磨損特性試驗(yàn)。以錫青銅QSn7-0.2、鋁青銅QAl9-4-4-2、鉛黃銅Hpb59-1、磷青銅QSn10-1四種不同材料的連桿襯套為研究對(duì)象進(jìn)行摩擦磨損特性試驗(yàn)，對(duì)四種材料連桿襯套的表面形貌變化、摩擦磨損特性進(jìn)行了對(duì)比分析，通過(guò)試驗(yàn)發(fā)現(xiàn)錫青銅QSn7-0.2連桿襯套具有較好的減摩耐磨性能。
[Abstract]:The friction characteristics of friction pairs are closely related to their surface morphology. It has become a scientific research focus in recent years to change the friction characteristics through the design of surface morphology. The surface morphology of engine connecting rod bushing not only has great influence on its own friction characteristics, wear characteristics, film forming effect and corrosion resistance, but also has a great effect on the operation performance and working efficiency of the whole equipment. Vibration is closely related to noise control. Therefore, improving the surface morphology is a very effective channel for prolonging the life of parts and equipment and improving the operation performance. In order to better control the friction characteristics of the connecting rod bushing in the working condition, researchers have done a lot of research work in the research and development of the link bushing material, lubrication and so on, but the influence of the surface morphology on the friction and wear characteristics is less studied. In this paper, the influence of surface morphology on friction characteristics is studied by using connecting rod bushing with different materials under the condition of sufficient lubrication and invariable lubrication conditions. The main work of this paper is as follows: (1) firstly, the definition and significance of many surface topography parameters are analyzed and analyzed from a large number of two-dimensional surface topography parameters selected part of the effective parameters with functional characteristics. Based on the contact and lubrication of rough peaks, seven effective parameters with functional characteristics were selected from a large number of surface topography parameters to be analyzed. The surface topography parameters of connecting rod bushing were collected by JB-5C roughness profiler. (2) the friction characteristics of connecting rod bushing were tested, and the parameters of surface topography, speed, load, lubrication were studied. The influence of friction distance on the friction characteristics is obtained, and the corresponding curves are obtained. It is concluded that the change of the shape of the connecting rod bushing is related to the surface morphology of the piston pin on the hard surface. (3) BP neural network MIV method was used to screen the surface morphology parameters. The influence of many surface morphology parameters on the friction characteristics is different, so it is very important to study the influence degree of different surface morphology parameters. By using BP neural network toolbox and MIV parameter screening method in MATLAB, the average influence value of surface topography parameters on friction torque is programmed and calculated, and these parameters are sorted according to the importance degree. The parameters which have a great influence on the friction characteristics are selected as the key basis for the design of the surface topography. It lays a foundation for improving the friction characteristics by changing the surface morphology of the connecting rod bushing. (4) the friction and wear characteristics of the connecting rod bushing with different materials are tested. The friction and wear characteristics of four kinds of connecting rod bushings of tin bronze QSn7-0.2, aluminum bronze QAl9-4-4-2, lead brass Hpb59-1, phosphor bronze QSn10-1 were studied. The surface morphology and friction and wear characteristics of four kinds of materials connecting rod bushing were compared and analyzed. It is found that tin bronze QSn7-0.2 connecting rod bushing has good antifriction and wear resistance.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類(lèi)號(hào)】：TH117.1

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