圆锥滚子贯穿式超精研油石与滚子接触特性分析
发布时间：2018-08-29 18:57
【摘要】：滚动轴承是工业生产及日常生活中重要的基础件,圆锥滚子轴承应用广泛,圆锥滚子锥面母线是凸度曲线,合适的凸度能够增强滚子承载能力,减小边缘应力集中,改善弹流润滑。理论与实验均证明,对数凸度是最佳凸度。贯穿式超精研是滚子加工中最后一道工序,对圆锥滚子凸度的形状起到决定性作用。由于对数凸度形状复杂且凸度量极小,该工艺尚未得到突破。本文基于圆锥滚子贯穿式超精研特点,将圆锥滚子视为由大量直径逐渐增大的圆柱切片构成的圆锥体,借鉴部分磨削模型的构建方法,分析油石与圆锥滚子的接触特性;针对定姿态贯穿式超精研,建立周向接触弧长、动态有效磨刃数、磨刃未变形切屑最大厚度、圆锥滚子锥面粗糙度等模型,利用MATLAB进行仿真并分析主要参数对各模型的影响;针对变姿态贯穿式超精研,分析接触线变化规律及圆锥滚子材料去除过程;进行圆锥滚子贯穿式超精研实验,通过实验获得圆锥滚子锥面粗糙度数据并与粗糙度理论数值对比。得到结论如下所述。周向接触弧长随圆锥滚子切片半径的增大而增大;动态有效磨刃数随圆锥滚子切片半径和油石切入加工表面深度的增大而增大;磨刃未变形切屑最大厚度随圆锥滚子切片半径、油石切入加工表面深度和圆锥滚子旋转速度的增大而增大,随油石振荡频率和磨刃锋利程度的增大而减小。当圆锥滚子小端逐渐抬高时,油石与圆锥滚子小端接触线逐渐变长,与圆锥滚子锥面接触线是关于上母线对称的两条线段且距离逐渐变大,与大端接触线是分布于锥面接触线两侧的两条线段且逐渐变短;变姿态贯穿式超精研在理论上可以加工出任何凸度,是最理想的圆锥滚子超精研加工方式。圆锥滚子锥面粗糙度随油石振荡频率的增大而降低;粗糙度实验数据与理论计算值接近。本文重点研究了贯穿式超精研工艺中油石与圆锥滚子的接触特性,为揭示圆锥滚子凸度的修形机理与规律提供了重要的理论支撑。
[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.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.33
本文编号：2212104
[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.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH133.33
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