本文選題：滾動軸承 + 接觸��； 參考：《華中科技大學(xué)》2013年碩士論文

【摘要】：軸承是應(yīng)用極為廣泛的重要機械基礎(chǔ)件，滾動軸承在工作時既是運動連接件，又是載荷支撐件，其力學(xué)狀態(tài)較為復(fù)雜，由于各種原因容易引起失效，為研究軸承破壞的力學(xué)機理、優(yōu)化軸承設(shè)計、提高軸承使用壽命，進行軸承的力學(xué)分析顯得十分有必要。 本文首先簡要介紹了軸承力學(xué)分析的理論基礎(chǔ)，，然后采用有限元法對滾動軸承進行靜態(tài)下和動態(tài)下的力學(xué)分析以及熱應(yīng)力分析。綜合各方面因素建立滾動軸承6206的彈性有限元模型，仿真分析得到了軸承在靜態(tài)條件下的應(yīng)力分布，軸承的應(yīng)力主要集中在發(fā)生接觸的小區(qū)域內(nèi)，滾珠與內(nèi)圈接觸產(chǎn)生的應(yīng)力大于與外圈接觸產(chǎn)生的應(yīng)力，滾珠與圈體接觸的最大應(yīng)力出現(xiàn)在接觸面下一點，是軸承發(fā)生疲勞剝落的力學(xué)誘因，滾珠與圈體的接觸區(qū)域成橢圓形分布，接觸應(yīng)力成半橢球形分布，計算可以得到接觸應(yīng)力大小以及接觸區(qū)尺寸等。 分析了動態(tài)條件下軸承的受力特點及運動特點，軸承應(yīng)力的分布與靜態(tài)條件下的應(yīng)力分布相似而又表現(xiàn)出一些不同，在前接觸區(qū)和后接觸區(qū)也會有較大應(yīng)力產(chǎn)生。最大應(yīng)力可能偏離接觸中心，同樣載荷下軸承各元件在動態(tài)條件下分析得到的最大應(yīng)力大于靜態(tài)條件下分析得到的最大應(yīng)力。滾珠的運動具有不穩(wěn)定性特點，計算可以得到滾珠運動速度、運動狀態(tài)及運動軌跡等。滾動軸承靜態(tài)分析和動態(tài)分析的模擬值和理論值相差較小，仿真結(jié)果具有較高的可靠性。 軸承在熱膨脹受阻的條件下也會產(chǎn)生較大的應(yīng)力，應(yīng)力分布與徑向力引起的軸承應(yīng)力分布類似。有限元仿真可以得到軸承熱應(yīng)力的分布和特點、以及軸承各部分的位移情況，盡管熱膨脹位移很小，但產(chǎn)生的應(yīng)力很大，軸承初始游隙的設(shè)計顯得尤為重要。
[Abstract]:Bearing is an important part of mechanical foundation which is widely used. The rolling bearing is not only a moving connector but also a load support part when working. The mechanical state of the bearing is more complicated, and it is easy to cause failure due to various reasons. In order to study the mechanical mechanism of bearing failure, optimize the bearing design and improve the bearing service life, it is necessary to analyze the bearing mechanics. In this paper, the theoretical basis of bearing mechanics analysis is briefly introduced, and then the mechanical analysis and thermal stress analysis of rolling bearing under static and dynamic conditions are carried out by finite element method. The elastic finite element model of rolling bearing 6206 is established by synthesizing various factors, and the stress distribution of bearing under static condition is obtained by simulation analysis. The stress of bearing is mainly concentrated in the small area where contact occurs. The contact stress between ball and inner ring is greater than that produced by contact with outer ring. The maximum contact stress between ball and ring appears at a point below the contact surface, which is the mechanical inducement of bearing fatigue spalling. The contact region between the ball and the ring is elliptical and the contact stress is semi-ellipsoid. The size of contact stress and contact zone can be obtained by calculation. The stress distribution of bearing under dynamic condition is similar to that under static condition, but there are some differences between the stress distribution and the stress distribution in the front contact area and the back contact area. The stress will also be produced in the front contact area and the rear contact area. The maximum stress may deviate from the contact center, and the maximum stress under dynamic condition is larger than that under static condition under the same load. The motion of ball is unstable, and the velocity, state and track of ball motion can be obtained by calculation. The difference between the simulation value and the theoretical value of the static analysis and dynamic analysis of rolling bearing is small, and the simulation results have high reliability. The stress distribution of bearing is similar to that caused by radial force. Finite element simulation can obtain the distribution and characteristics of the bearing thermal stress and the displacement of each part of the bearing. Although the thermal expansion displacement is very small, the stress generated is very large, so the design of the initial clearance of the bearing is particularly important.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TH133.33

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