铝合金轮毂螺栓预紧力提升方法及试验研究

发布时间：2018-02-25 22:30

本文关键词： 铝合金轮毂螺栓预紧力圆锥面过盈配合摩擦系数螺栓应变试验　出处：《燕山大学》2016年硕士论文　论文类型：学位论文

【摘要】：轮毂上螺母螺栓联接是一种相对复杂的联接方式,其螺母为锥面螺母,与支撑面配合方式为圆锥面过盈配合,这种配合方式具有定心好、接触强度大、装拆方便等特点。作为轮毂上重要的联接方式,提高螺栓以及螺母连接的可靠性,有效提升螺栓预紧力大小,是轮毂安全性能的保障。分析了不同拧紧控制方法的主要特点以及实际应用性,根据不同拧紧控制方法的特点结合实际情况确立了扭矩法控制轮毂上螺栓预紧力。根据轮毂上螺母圆锥面过盈配合方式,建立了螺母与支撑面应力分析模型,分析了螺母与支撑面应力特点以及分布情况。根据静力学平衡条件、弹塑性理论以及螺母圆锥面过盈配合特点,推导了轮毂上螺栓预紧力求解模型。应用数值计算方法,在MATLAB中构造循环算法,以螺母位移为循环变量求解轮毂上螺栓数值。分析了总扭矩、螺母支撑面摩擦力矩、螺栓预紧力与位移关系。根据总扭矩、螺栓预紧力与螺母位移变化关系,分析了螺纹副摩擦系数、支撑面摩擦系数、螺母锥面角度等基本参数对螺栓预紧力以及螺母支撑面摩擦力矩的影响规律,分析了螺纹副摩擦、螺母与支撑面摩擦的摩擦特性以及影响因素。分析了各个实验设备的主要功能及其应用,分析了轮毂上螺栓应变实验基本原理、实验基本条件。通过改变实验试件的基本参数,分析了螺母锥面角度、支撑面摩擦状态改变对轮毂上螺栓预紧力的影响,分析比较了实验结果与理论数值结果。
[Abstract]:The nut bolt connection on the wheel hub is a relatively complicated connection mode. The nut is a cone nut, and the matching way with the supporting surface is a conical interference fit. This kind of fit has good centering and high contact strength. As an important connection mode on wheel hub, the reliability of bolt and nut connection is improved, and the pretightening force of bolt is effectively increased. The main features of different tightening control methods and their practical application are analyzed. According to the characteristics of different tightening control methods combined with the actual situation, the torque method is established to control the pre-tightening force of the bolt on the hub. According to the interference mode of the conical surface of the nut on the hub, the stress analysis model of the nut and the supporting surface is established. The stress characteristics and distribution of nut and support surface are analyzed. According to static equilibrium condition, elastic-plastic theory and interference fit characteristic of nut cone surface, a model for solving pre-tightening force of bolt on wheel hub is derived, and numerical calculation method is applied. A cyclic algorithm is constructed in MATLAB, in which the nut displacement is used as the cyclic variable to solve the numerical value of the bolt on the hub. The total torque, the friction moment of the nut support surface, the relationship between the bolt pretightening force and the displacement are analyzed. The relationship between bolt pretension force and nut displacement is analyzed. The influence of the basic parameters such as the friction coefficient of thread pair, the friction coefficient of support surface and the angle of nut cone on the pretightening force of bolt and friction moment of nut supporting surface are analyzed, and the friction of thread pair is analyzed. The friction characteristics of nut and support surface and its influencing factors are analyzed. The main functions and applications of each experimental equipment are analyzed. The basic experimental principle and experimental conditions of bolt strain on wheel hub are analyzed. The influence of the angle of nut cone and the friction state of the supporting surface on the pretightening force of the bolt on the wheel hub is analyzed and compared with the experimental results and the theoretical numerical results.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.343

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