發(fā)布時(shí)間：2018-08-29 18:57

【摘要】：滾動(dòng)軸承是工業(yè)生產(chǎn)及日常生活中重要的基礎(chǔ)件,圓錐滾子軸承應(yīng)用廣泛,圓錐滾子錐面母線是凸度曲線,合適的凸度能夠增強(qiáng)滾子承載能力,減小邊緣應(yīng)力集中,改善彈流潤滑。理論與實(shí)驗(yàn)均證明,對數(shù)凸度是最佳凸度。貫穿式超精研是滾子加工中最后一道工序,對圓錐滾子凸度的形狀起到?jīng)Q定性作用。由于對數(shù)凸度形狀復(fù)雜且凸度量極小,該工藝尚未得到突破。本文基于圓錐滾子貫穿式超精研特點(diǎn),將圓錐滾子視為由大量直徑逐漸增大的圓柱切片構(gòu)成的圓錐體,借鑒部分磨削模型的構(gòu)建方法,分析油石與圓錐滾子的接觸特性;針對定姿態(tài)貫穿式超精研,建立周向接觸弧長、動(dòng)態(tài)有效磨刃數(shù)、磨刃未變形切屑最大厚度、圓錐滾子錐面粗糙度等模型,利用MATLAB進(jìn)行仿真并分析主要參數(shù)對各模型的影響;針對變姿態(tài)貫穿式超精研,分析接觸線變化規(guī)律及圓錐滾子材料去除過程;進(jìn)行圓錐滾子貫穿式超精研實(shí)驗(yàn),通過實(shí)驗(yàn)獲得圓錐滾子錐面粗糙度數(shù)據(jù)并與粗糙度理論數(shù)值對比。得到結(jié)論如下所述。周向接觸弧長隨圓錐滾子切片半徑的增大而增大;動(dòng)態(tài)有效磨刃數(shù)隨圓錐滾子切片半徑和油石切入加工表面深度的增大而增大;磨刃未變形切屑最大厚度隨圓錐滾子切片半徑、油石切入加工表面深度和圓錐滾子旋轉(zhuǎn)速度的增大而增大,隨油石振蕩頻率和磨刃鋒利程度的增大而減小。當(dāng)圓錐滾子小端逐漸抬高時(shí),油石與圓錐滾子小端接觸線逐漸變長,與圓錐滾子錐面接觸線是關(guān)于上母線對稱的兩條線段且距離逐漸變大,與大端接觸線是分布于錐面接觸線兩側(cè)的兩條線段且逐漸變短;變姿態(tài)貫穿式超精研在理論上可以加工出任何凸度,是最理想的圓錐滾子超精研加工方式。圓錐滾子錐面粗糙度隨油石振蕩頻率的增大而降低;粗糙度實(shí)驗(yàn)數(shù)據(jù)與理論計(jì)算值接近。本文重點(diǎn)研究了貫穿式超精研工藝中油石與圓錐滾子的接觸特性,為揭示圓錐滾子凸度的修形機(jī)理與規(guī)律提供了重要的理論支撐。
[Abstract]:Roller bearing is an important basic part in industrial production and daily life. Taper roller bearings are widely used. The conical busbar of tapered roller is convex curve. Proper crown can enhance the bearing capacity of roller and reduce the edge stress concentration. Improved elastohydrodynamic lubrication. It is proved theoretically and experimentally that logarithmic convexity is the best convexity. Perpendicular superfine grinding is the last working procedure in roller processing, which plays a decisive role in the shape of cone roller crown. Because of the complex shape of logarithmic convexity and minimal convex metric, the process has not been broken through. In this paper, the cone roller is regarded as a cone which is made up of a large number of cylindrical slices with increasing diameter based on the characteristics of the penetrating superfine research of the cone roller, and the contact characteristics between the oil stone and the cone roller are analyzed by using the method of constructing partial grinding model. Aiming at the model of constant attitude penetration super-fine research, the models of circumferential contact arc length, dynamic effective grinding edge number, maximum thickness of undeformed chip, conical roller cone roughness and so on are established, and the influence of main parameters on each model is analyzed by MATLAB. In this paper, the changing law of contact line and the material removal process of cone roller are analyzed, and the data of cone surface roughness of cone roller are obtained and compared with the theory of roughness. The conclusion is as follows. The circumferential contact arc length increases with the increase of the radius of the tapered roller slice, the dynamic effective grinding edge increases with the increase of the radius of the tapered roller slice and the depth of the cutting surface of the oil stone increases, and the maximum thickness of the undeformed chip of the grinding edge increases with the radius of the tapered roller slice. The depth of the cutting surface and the rotation speed of the cone roller increase with the increase of the oscillation frequency of the stone and the sharpness of the grinding edge. When the small end of the cone roller is gradually raised, the contact line between the small end of the oil stone and the small end of the cone roller becomes longer, and the contact line with the cone surface of the cone roller is two segments about the symmetry of the upper busbar and the distance is gradually increasing. The contact lines with large ends are two lines distributed on both sides of the conical contact line and become shorter gradually, and the variable attitude penetrating super-precision research can process any convexity in theory, which is the most ideal way of super-finishing processing for cone rollers. The roughness of cone surface of cone roller decreases with the increase of oscillation frequency of oil stone, and the experimental data of roughness are close to the theoretical calculated value. In this paper, the contact characteristics of oil stone and cone roller are studied in detail, which provides an important theoretical support for revealing the mechanism and regularity of crown modification of cone roller.
【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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本文編號：2212104