共查询到18条相似文献,搜索用时 171 毫秒
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对GCr15钢制轮毂轴承内圈锻件毛坯在立式辗环机上热辗扩成形中的应力应变分布进行了刚粘塑性有限元计算,得到了在真实径向辗扩压力和进给速度下该内圈材料的应力、应变、流动速度分布等宏观物理参量,设计了具有优良成形性能的内锥孔内圈锻件毛坯;并深入研究了内圈锻件在热辗扩中的塑性变形规律及其成形特点,对锻造毛坯优化设计及热辗扩工艺的稳定性控制具有借鉴意义. 相似文献
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《汽车零部件》2015,(9)
轴铆合装配工艺是针对轿车轮毂轴承轻量化、集成化、高可靠性等要求提出的一种轮毂轴承单元装配工艺,提出一种基于理论推导、现场测试及设备结构参数确定轴铆过程中铆头运动方程的方法。首先应用空间直角坐标法和欧拉角方法,根据铆接机的结构,推导铆头运动方程;其次开发轮毂轴承单元铆接过程中轴向铆装力及机床主轴轴向进给位移的在线测试系统;基于铆头运动方程、测试数据及设备结构参数,确定铆头空间速度方程及三轴角速度方程;最后应用有限元方法模拟轴铆装配过程,通过比较模拟和测试的轴向铆接力及铆接后轮毂轴端部几何形状,确定铆头运动方程有效性。文中的研究为轮毂轴承单元轴铆工艺数值模拟及工艺优化奠定基础。 相似文献
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轮毂轴承单元作为汽车关键零部件,对汽车的安全性有着重要的影响,如何构建出有效的有限元模型对轮毂轴承单元的性能分析和设计有着重要的意义。基于材料的拉伸试验、圆环墩粗试验、理论推导获得轴铆合过程的材料参数、摩擦系数和铆头空间运动轨迹,完成有限元模型的构造,同时应用ALE网格策略提高计算效率。最后通过试验与仿真结果对比,并基于轮毂轴承的相关性能参数的经验值,验证轮毂轴承轴铆合过程有限元模型的有效性,为轮毂轴承的数值化分析提供有效的数值模型。 相似文献
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高速主轴离心膨胀及对轴承动态特性的影响 总被引:6,自引:0,他引:6
以高速主轴系统为对象,将主轴转子和轴承内圈分别等效为等截面梁和空心圆盘,计算离心力作用下主轴转子和轴承内圈的径向弹性变形,并分析主轴转子与轴承连接状态随转速升高的变化趋势。考虑旋转部件的离心膨胀变形,建立高速主轴轴承动力学模型并进行试验验证。在此基础上,研究离心效应对主轴轴承径向预紧状态的影响,揭示高速主轴轴承动态特性随转速的变化规律。研究结果表明,离心力引起的径向膨胀变形使滚动体与轴承内、外圈之间的接触角减小,接触力增加。主轴轴承的轴向刚度和径向刚度均随转速的升高而降低。轴承内圈的离心膨胀变形对轴承轴向刚度的影响可以忽略不计,而能在一定程度上提高轴承的径向刚度。 相似文献
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T. A. Harris 《摩擦学汇刊》2013,56(3):229-241
Skidding which occurs in high speed roller bearings frequently causes wear and incipient failure of bearing inner ring and roller surfaces. To eliminate skidding, aircraft gas turbine designers, historically, have employed out-of-round outer rings and other preloading devices. Prior to testing of the full-scale bearings at engine speeds, however, the designers have not, heretofore, been able to determine (a) the extent of skidding which occurs and (b) the effectiveness of means employed to eliminate skidding. The analytical method which is presented by this discussion is based upon recently developed elastohydrodynamic lubrication theory and can be used in lieu of expensive testing procedures to adequately predict bearing cage speed, and therefore the extent of skidding, under any condition of radial load and shaft speed. Moreover, the analysis can be used to determine how much radial preloading or outer ring out-of-roundness is necessary to minimize skidding. The analytical data of this study are compared against experimental data to establish the adequacy of the analysis. 相似文献
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针对机器人用四点接触球轴承旋转精度难以预测和控制的问题,提出了同时考虑轴承内圈沟道和外圈沟道圆度误差的轴承旋转精度数值计算方法。根据轴承内部元件运动学和几何学关系建立轴承旋转精度数值计算模型。使用MATLAB编写轴承旋转精度求解程序,得到内圈沟道圆度误差幅值和谐波阶次、外圈沟道圆度误差幅值和谐波阶次、钢球直径偏差及钢球个数对轴承旋转精度的影响规律。进行了轴承旋转精度试验,验证了仿真结果的正确性。轴承旋转精度涉及很多指标,所研究的四点接触球轴承旋转精度衡量指标指轴承外圈径向跳动。结果表明:轴承外圈径向跳动随着内外沟道圆度误差幅值的增大先平稳后快速增大,随着内圈外沟道圆度误差谐波阶次的增大呈现周期性变化,随着钢球直径偏差的增大呈线性减小,随着轴承内部钢球个数的增大呈指数减小。所建模型解决了四点接触球轴承旋转精度难以进行理论求解的问题,能够准确预测轴承的旋转精度,为四点接触球轴承的精度设计提供了理论基础。 相似文献
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APPLICATION OF SYNCHRONOUS AVERAGING TO VIBRATION MONITORING OF ROLLING ELEMENT BEARINGS 总被引:4,自引:0,他引:4
In this paper, the high frequency resonance technique, used for many years in the early detection of failure in rolling element bearings by vibration analysis, is combined with the technique of synchronous averaging, which has long been applied to vibration analysis of gears for the early detection of failure. It is shown that by synchronising the averaging of the envelope signal with a trigger signal taken from the rotation of the shaft, a representation is obtained for a bearing under radial load of the influence of the load distribution and the effects of the transfer path to the vibration transducer. By synchronising with the rotation speed of the shaft relative to the cage, an estimate is obtained of the distribution of the damage on the inner race of the bearing, and of the variations between rolling elements. The techniques are demonstrated by experiments on a laboratory test rig with a rolling bearing under radial load and multiple simulated spalls on the inner race. 相似文献
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Longsheng Lu Dong Yuan Yong Tang Jiang Cheng 《The International Journal of Advanced Manufacturing Technology》2012,61(1-4):185-193
Miniature inner grooved copper tube (MIGCT) is widely applied in industries. To overcome the weak rigidity and strength of MIGCT during stepped tubes manufacturing, rotary swaging process was selected after comparing with radial forging process. The working principle of the rotary swaging was analyzed. A rotary swaging machine, whose workpiece feeding and clamping was respectively driven by an air cylinder and a finger cylinder, was designed. Experiments indicate that the MIGCT was slave rotating with forging dies during rotary swaging. Theoretical analysis was done to investigate the reason of the slave rotation. Experiments were carried out to verify the theoretical analysis. Furthermore, the influences of push force and clamping force on rotation speed were discussed. With the increase of clamping force, the rotation speed of MIGCT decreases gradually in a constant ratio. However, the push force influences the tube rotation speed slightly. In general, it found that an optimal rotation speed of MIGCT is beneficial to the manufacture of the stepped tube. 相似文献