装配式凸轮轴扩管联接技术研究

发布时间：2018-02-14 19:28

本文关键词： 装配式凸轮轴钢球扩管联接多道次扩管工艺可靠性设计数值模拟　出处：《吉林大学》2012年硕士论文　论文类型：学位论文

【摘要】：装配式凸轮轴技术是近年来迅速发展并得到广泛应用的一种新型凸轮轴生产技术，其连接技术是核心技术。这种技术较好的将产品设计、材料匹配和性能优化结合起来，具有轻量化、材料优化、精密制造、柔性化生产等优势，符合现代汽车技术发展的要求。目前，装配式凸轮轴的联接技术种类很多，各具优缺点。本文以某汽车公司的V348装配式凸轮轴为典型样件，进行硬质钢球扩管联接技术的研究，结合试验和数值模拟对联接工艺参数和联接强度进行分析，并进行优化设计和可靠性研究；创新性提出和研究了多道次硬质钢球扩管联接工艺(Multi-Pass TubeExpanding Process)；并对梯形键径向联接和电磁扩管联接技术在装配式凸轮轴的应用原理及可行性进行了初步探讨。由于机械工业对于节能和环保的高要求，随着对汽车性能要求的不断提高，汽车零部件的加工技术也向着柔性化加工、轻量化、性能可靠等趋势发展。而凸轮轴作为发动机中的关键构件，因此，研究和发展装配式凸轮轴技术已成为重要的课题。本文的主要工作及取得的成果如下： (1)对比分析了装配式凸轮轴的几种联接技术，根据V348装配式凸轮轴技术参数和要求，分析了硬质钢球扩管联接过程；对凸轮和轴管进行材料匹配研究，以及平面应变状态下扩管联接弹塑性力学解析。 (2)对V348凸轮轴钢球扩管联接过程进行数值模型创建；对材料模型进行分析和优化选择等关键技术问题的处理，并进行了钢球扩管联接实验及扭转实验，对实验结果和数值模拟结果对比，表明数值模拟的有效性，可较好反应冷挤压扩管联接过程。 (3)利用数值模拟方法对钢球扩管联接技术进行工艺分析、工艺参数优化设计。系统分析了凸轮内孔边倒角半径、初始装配间隙、过盈量、轴管壁厚和加载速度等主要参数对联接强度的影响；对其联接扭转强度和疲劳强度进行理论分析。 (4)对多道次加载扩管联接进行理论和数值模拟分析，，选用双道次加载方式可以优化扩管联接工艺，具有较好的联接可靠性。 (5)对滚花法联接凸轮轴进行疲劳可靠性分析，结果表明滚花压配联接技术对材料许用疲劳应力σ要求较高；初步探索了高能率电磁成形装配式凸轮轴技术及可行性。本文对扩管工艺装配凸轮轴进行了径向平面内的扩管力学分析；理论分析硬质钢球扩管装配凸轮轴联接原理；通过数值模拟分析了装配式凸轮轴的工艺参数对联接质量的影响，并为V348凸轮轴的扩管装配联接提供了依据。
[Abstract]:Assembly camshaft technology is a new type of camshaft production technology which has been developed rapidly and widely used in recent years. Its connection technology is the core technology, which combines product design, material matching and performance optimization. Light weight, material optimization, precision manufacturing, flexible production and other advantages, meet the requirements of modern automotive technology development. At present, there are many kinds of assembly camshaft connection technology, each has its own advantages and disadvantages. This paper takes V348 assembly camshaft of a car company as a typical sample to study the connection technology of rigid steel ball expansion tube. Combined with test and numerical simulation, the parameters and strength of connection are analyzed, and the optimum design and reliability are studied. Multi-pass TubeExpanding TubeExpanding process is innovatively proposed and studied, and the application principle and feasibility of trapezoid key radial connection and electromagnetic expansion connection technology in fabricated camshaft are discussed preliminarily. Due to the high requirements of the mechanical industry for energy saving and environmental protection, with the continuous improvement of the requirements for the performance of the automobile, the processing technology of automobile parts is also oriented to flexible processing and lightweight. Camshaft is the key component of engine. Therefore, the research and development of assembly camshaft technology has become an important subject. The main work and achievements of this paper are as follows:. According to the technical parameters and requirements of V348 assembled camshaft, the connection process of rigid steel ball expansion tube is analyzed, and the material matching between cam and shaft tube is studied. And the elastic-plastic mechanics analysis of the expanded tube connection under the plane strain state. (2) the numerical model of V348 camshaft steel ball expansion connection is established, and the key technical problems such as material model analysis and optimization selection are dealt with, and the experiments of steel ball expanding pipe connection and torsion are carried out. The comparison between the experimental results and the numerical simulation results shows that the numerical simulation is effective and can well reflect the cold extruded tube expansion process. Using numerical simulation method to analyze the technology of steel ball expanding pipe connection and optimize the design of process parameters. The chamfering radius, initial assembly clearance, interference quantity of cam inner hole are analyzed systematically. The influence of main parameters such as axial tube wall thickness and loading speed on the connection strength is analyzed theoretically and the connection torsional strength and fatigue strength are analyzed theoretically. 4) the theory and numerical simulation analysis of multi-pass loading tube expansion connection are carried out. The technology of expanding tube connection can be optimized by using double pass secondary loading mode, and the connection reliability is good. (5) the fatigue reliability analysis of camshaft with knurling method is carried out, the results show that the allowable fatigue stress 蟽 of material is high by knurling fitting technology, and the technology and feasibility of high energy rate electromagnetic forming assembly camshaft are preliminarily explored. In this paper, the mechanism of tube expansion in radial plane is analyzed, and the connection principle of rigid steel ball tube assembly camshaft is analyzed theoretically. The influence of process parameters of assembled camshaft on the connection quality is analyzed by numerical simulation, and the basis for assembly connection of V348 camshaft is provided.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.2

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