本文選題：滾針軸承 + 滾子凸型��； 參考：《河南科技大學(xué)》2017年碩士論文

【摘要】：滾針軸承的承載性能對軸承的接觸疲勞以及磨損都有及其重要的影響,并在很大程度上,決定了軸承的使用壽命,同時也是軸承設(shè)計(jì)的重要研究對象。本論文采用切片法和有限元分析法對滾針軸承的徑向受載情況進(jìn)行研究,對比計(jì)算軸承的載荷分布和接觸壓力。通過應(yīng)用切片法考慮滾子凸型影響,基于滾動軸承設(shè)計(jì)方法和Hertz接觸理論,建立滾針軸承力學(xué)模型,并推導(dǎo)出軸承的載荷分布和接觸壓力關(guān)于幾何參數(shù)的表達(dá)式,用MATLAB編寫求解軸承載荷分布和接觸壓力的程序并進(jìn)行數(shù)值計(jì)算。本文采用有限元分析軟件ANSYS對模型進(jìn)行有限元分析,根據(jù)徑向受載滾針軸承的幾何特征建立其有限元模型,通過分析滾針在不同直徑、長度情況下的最大接觸應(yīng)力和彈性趨近量變化,發(fā)現(xiàn)直徑變化對滾針軸承的接觸應(yīng)力和彈性趨近量的影響規(guī)律,為滾針軸承的結(jié)構(gòu)參數(shù)設(shè)計(jì)提供參考依據(jù)。外圈沖壓滾針軸承的薄壁外圈采用優(yōu)質(zhì)鋼板經(jīng)精密沖壓而成,成形質(zhì)量穩(wěn)定,并制造經(jīng)濟(jì)。但其成形工序多、材料彈塑性變形大,極易出現(xiàn)外圈擠壓破裂和壁厚不均勻問題。本文采用有限元方法,針對某一型號滾針軸承的外圈沖壓成形工序過程,進(jìn)行數(shù)值模擬并研究其各個工序的成形規(guī)律,分析模具沖壓速度和圓弧過渡圓角大小對反作用力和特征點(diǎn)應(yīng)力變化的影響,為優(yōu)化工藝參數(shù)選擇提供依據(jù)。最后對毛坯落料和反拉伸階段的成形件進(jìn)行切樣試驗(yàn),并與仿真結(jié)果進(jìn)行比對,兩者具有很好的一致性,表明用本文建立的仿真分析方法來預(yù)測滾針軸承薄壁外圈多工序沖壓質(zhì)量的有效性,可為滾針軸承沖壓工藝規(guī)范制定提供參考依據(jù)。
[Abstract]:The bearing capacity of needle roller bearings has an important influence on contact fatigue and wear of bearings. To a great extent, it determines the service life of bearings and is also an important research object in bearing design. In this paper, the radial load of needle roller bearing is studied by slice method and finite element method, and the load distribution and contact pressure are calculated. Based on the rolling bearing design method and Hertz contact theory, the mechanical model of needle roller bearing is established by using slice method to consider the influence of roller convex profile, and the expressions of load distribution and contact pressure on geometric parameters of the bearing are derived. MATLAB is used to program and calculate the load distribution and contact pressure of bearing. In this paper, the finite element analysis software ANSYS is used to analyze the model. According to the geometric characteristics of radial loaded needle bearing, the finite element model is established. The change of maximum contact stress and elastic approach under the condition of length, the influence of diameter change on the contact stress and elastic approach of needle roller bearing is found, which provides a reference for the design of structural parameters of needle roller bearing. The thin-wall outer ring of outer ring punching needle roller bearing is made of high quality steel sheet through precision stamping, the forming quality is stable and the manufacture is economical. However, due to its many forming procedures and large elastic-plastic deformation, the extrusion fracture and uneven wall thickness of the outer ring are easy to occur. In this paper, the finite element method is used to simulate the forming process of the outer ring of a certain type of needle roller bearing and to study the forming law of each process. The influence of die stamping speed and arc transition angle on the change of reaction force and stress at characteristic point is analyzed, which provides the basis for optimizing process parameters. Finally, the cutting test of blank blanking and reverse drawing is carried out, and the results are compared with the simulation results. The results show that the two parts are in good agreement with each other. It is shown that the simulation analysis method established in this paper is effective in predicting the stamping quality of the thin wall outer ring of needle roller bearing, and can provide a reference for drawing up the stamping process specification of needle roller bearing.
【學(xué)位授予單位】：河南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH133.33

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