冲压外圈滚针轴承设计和仿真技术研究

发布时间：2018-06-22 22:23

本文选题：滚针轴承 + 滚子凸型　；参考：《河南科技大学》2017年硕士论文

【摘要】：滚针轴承的承载性能对轴承的接触疲劳以及磨损都有及其重要的影响,并在很大程度上,决定了轴承的使用寿命,同时也是轴承设计的重要研究对象。本论文采用切片法和有限元分析法对滚针轴承的径向受载情况进行研究,对比计算轴承的载荷分布和接触压力。通过应用切片法考虑滚子凸型影响,基于滚动轴承设计方法和Hertz接触理论,建立滚针轴承力学模型,并推导出轴承的载荷分布和接触压力关于几何参数的表达式,用MATLAB编写求解轴承载荷分布和接触压力的程序并进行数值计算。本文采用有限元分析软件ANSYS对模型进行有限元分析,根据径向受载滚针轴承的几何特征建立其有限元模型,通过分析滚针在不同直径、长度情况下的最大接触应力和弹性趋近量变化,发现直径变化对滚针轴承的接触应力和弹性趋近量的影响规律,为滚针轴承的结构参数设计提供参考依据。外圈冲压滚针轴承的薄壁外圈采用优质钢板经精密冲压而成,成形质量稳定,并制造经济。但其成形工序多、材料弹塑性变形大,极易出现外圈挤压破裂和壁厚不均匀问题。本文采用有限元方法,针对某一型号滚针轴承的外圈冲压成形工序过程,进行数值模拟并研究其各个工序的成形规律,分析模具冲压速度和圆弧过渡圆角大小对反作用力和特征点应力变化的影响,为优化工艺参数选择提供依据。最后对毛坯落料和反拉伸阶段的成形件进行切样试验,并与仿真结果进行比对,两者具有很好的一致性,表明用本文建立的仿真分析方法来预测滚针轴承薄壁外圈多工序冲压质量的有效性,可为滚针轴承冲压工艺规范制定提供参考依据。
[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.
【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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