本文選題：摩擦試驗(yàn) + 銷盤接觸仿真　； 參考：《上海工程技術(shù)大學(xué)》2015年碩士論文

【摘要】：據(jù)不完全統(tǒng)計(jì),摩擦大約消耗了超過1/3的能源,而磨損導(dǎo)致了超過70%的裝備失效。為了減少經(jīng)濟(jì)損失,近年來人們?cè)絹碓街匾暷Σ聊p基本規(guī)律的研究與實(shí)際工業(yè)生產(chǎn)的結(jié)合,本課題的研究正是基于這方面的內(nèi)容而展開的。本文首先介紹了摩擦磨損相關(guān)的基本原理,在此基礎(chǔ)上設(shè)計(jì)不同的試驗(yàn)方案來研究不同參數(shù)對(duì)摩擦系數(shù)的影響規(guī)律和權(quán)重次序;然后建立銷盤摩擦副的二維和三維模型,觀察接觸應(yīng)力的分布情況以及載荷對(duì)接觸應(yīng)力的影響;最后,根據(jù)摩擦磨損機(jī)理對(duì)揚(yáng)州源鋒機(jī)電有限公司提供的鼓式制動(dòng)器進(jìn)行研究,主要包括襯片夾具的摩擦學(xué)設(shè)計(jì)和鼓式摩擦片的參數(shù)優(yōu)化。論文研究的主要內(nèi)容和結(jié)果如下:(1)運(yùn)用MMW-1A和MMS-2A摩擦磨損試驗(yàn)機(jī),設(shè)計(jì)試驗(yàn)來檢測(cè)速度、載荷對(duì)摩擦系數(shù)的影響規(guī)律,并根據(jù)正交試驗(yàn)完成速度、載荷、時(shí)間影響摩擦系數(shù)的顯著順序。試驗(yàn)結(jié)果表明:摩擦系數(shù)隨著載荷、速度的增大有減小的趨勢(shì),影響程度的順序?yàn)檩d荷、時(shí)間、速度。這就為后續(xù)的研究工作奠定了理論基礎(chǔ)。(2)在有限元軟件Ansys中建立銷盤副的靜態(tài)和動(dòng)態(tài)模型,對(duì)接觸應(yīng)力進(jìn)行模擬分析。仿真結(jié)果表明,接觸應(yīng)力的分布呈現(xiàn)中間小、邊緣大的態(tài)勢(shì);銷盤滑動(dòng)以后,接觸應(yīng)力場(chǎng)向滑動(dòng)方向偏移,銷底部邊緣出現(xiàn)最大值,并且應(yīng)力值有所增大。另外,通過建立的三維模型分析載荷對(duì)接觸應(yīng)力的影響,發(fā)現(xiàn)隨著載荷的增大接觸應(yīng)力值增大,分布狀態(tài)沒有改變。有限元的分析可以從直觀上觀察接觸應(yīng)力分布,同時(shí)也為摩擦磨損機(jī)理研究提供的途徑。(3)根據(jù)提供摩擦片的形狀設(shè)計(jì)夾具,分別從定位和夾緊方面考慮,確定夾具的主體和夾緊裝置,然后對(duì)其仿真分析,得到最大偏移量為0.000197mm、承受最大應(yīng)力為1.09Mpa,滿足要求。這樣的分析能夠?yàn)榧庸ぶ圃鞙p小誤差、保證裝配精度。(4)利用Solid Works建立鼓式制動(dòng)器的幾何模型,并導(dǎo)入Ansys Workbench中,分析不同條件下摩擦片的應(yīng)力分布,完成摩擦片的材質(zhì)、起始角、厚度的優(yōu)化設(shè)計(jì)。分析結(jié)果表明,當(dāng)材質(zhì)為少金屬類、厚度在3mm~5mm之間、起始角在25°~27°之間的摩擦片,接觸應(yīng)力集中程度降低,波動(dòng)比較穩(wěn)定,能夠提供良好的制動(dòng)性能和增加使用壽命。參數(shù)的優(yōu)化能夠?yàn)樾滦椭苿?dòng)器的開發(fā)提供數(shù)據(jù)支持。
[Abstract]:According to incomplete statistics, friction consumes more than a third of the energy, while wear causes more than 70 percent of equipment failure. In order to reduce economic losses, more and more attention has been paid to the combination of the basic law of friction and wear with the actual industrial production in recent years. This paper first introduces the basic principles of friction and wear, and then designs different test schemes to study the influence law and weight order of different parameters on friction coefficient, and then establishes the two dimensional and three dimensional model of pin disk friction pair. The distribution of contact stress and the influence of load on contact stress are observed. Finally, according to the friction and wear mechanism, the drum brake provided by Yangzhou Yuanfeng Electromechanical Co., Ltd is studied. It mainly includes tribological design of lining clamp and parameter optimization of drum friction plate. The main contents and results of this paper are as follows: (1) by using MMW-1A and MMS-2A friction and wear testing machine, the speed and the influence of load on friction coefficient are tested by using MMW-1A and MMS-2A, and the speed and load are completed according to the orthogonal test. Time affects the significant order of friction coefficient. The experimental results show that the friction coefficient decreases with the increase of load and velocity, and the order of influence is load, time and speed. This lays a theoretical foundation for further research work. (2) the static and dynamic models of pin and disc pairs are established in the finite element software Ansys, and the contact stress is simulated and analyzed. The simulation results show that the distribution of contact stress is small in the middle and the edge is large. After sliding the contact stress field shifts to the sliding direction and the bottom edge of the pin appears the maximum value and the stress value increases. In addition, by analyzing the effect of load on contact stress, it is found that the distribution of contact stress does not change with the increase of load. The finite element analysis can observe the contact stress distribution intuitively, at the same time, it also provides a way for the study of friction and wear mechanism. (3) according to the shape of the friction plate, the fixture is designed from the aspects of location and clamping, respectively. The main body and clamping device of the fixture are determined, and the simulation results show that the maximum offset is 0.000197mm and the maximum stress is 1.09Mpa. it meets the requirements. This analysis can reduce the error and ensure the assembly accuracy for manufacturing. (4) using Solid Works to establish the geometric model of drum brake, and introducing it into Ansys Workbench, analyzing the stress distribution of friction plate under different conditions, completing the material and starting angle of friction piece. Optimum design of thickness. The results show that when the material is of less metal, thickness is between 3mm~5mm and the starting angle is between 25 擄and 27 擄, the contact stress concentration degree is reduced and the fluctuation is relatively stable, which can provide good braking performance and increase service life. The optimization of parameters can provide data support for the development of new brake.
【學(xué)位授予單位】：上海工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TH117.1

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