奥迪轿车车身轻量化结构设计及焊接工艺研究(含CAD图,CATIA三维图)(任务书,开题报告,文献摘要,外文翻译,论文说明书30000字,CAD图3张,CATIA三维图)
摘 要
纵观汽车行业的发展历史可知，汽车越来越向着智能化，轻量化方向发展。当今世界资源的消耗以及日益严峻的环境问题，使得节能减排已经是汽车行业生产过程中必须要考虑的一个问题。为解决这个问题，一种解决方案是开发新能源汽车，但是由于成本及技术局限，新能源汽车的性能和传统内燃机汽车相比还是有一定的差距的，所以目前而言还不足以大范围地普及新能源汽车；另一个解决方案就是轻量化，减轻汽车质量可以有效地降低汽车的尾气排放量及燃油消耗率。以往实验数据现实，汽车车身约占汽车总质量的35%～45%左右，所以汽车轻量化的研究主要就落脚到了汽车车身轻量化的研究上来。本文根据现有的轻量化手段，从材料和焊接工艺入手，采用高强钢替代传统的低碳钢钢板，并采取激光焊接替代传统的焊接方式以改进车身结构实现轻量化。在焊接时，由于实际进行实验费时费力，所以本论文利用现有的计算机软件分析技术，通过控制参数，模拟实际生产中的激光焊接过程，并同时对焊接时，焊接材料的温度场和应力场的变化规律进行统计、对比、分析，得出相应的模拟分析结果。并在此分析结果的基础上，将焊接时的工艺参数进行改变，分析工艺参数对焊接过程总的影响效果。
（1） 分析汽车轻量化的巨大现实意义及可行方案。
（2） 建立焊接过程的模型数据。
（3） 计算机软件动态仿真模拟焊接过程。
（4） 分析焊接结果及影响参数。
（5） 关键词：汽车车身轻量化；激光焊接；DP600高强钢；温度场；应力场
Abstract
Looking at the development history of the automotive industry, we can see that cars are becoming more intelligent and lightweight. Due to the depletion of resources in the world and increasingly severe environmental problems, energy conservation and emission reduction have become an issue that must be considered in the production process of the automotive industry. To solve this problem, one solution is to develop new energy vehicles. However, because of the cost and technical limitations, the performance of new energy vehicles still has a certain gap compared with traditional internal combustion engine vehicles, so at present, it is not sufficient for a wide range of applications. Popularize new energy vehicles; another solution is to reduce the weight of vehicles, and reduce the ality of automobiles can effectively reduce vehicle emissions. The actual experimental data in the past, the automobile body accounts for about 35% to 45% of the total mass of the car, so the study of the lightweight of the automobile has mainly settled on the research of the lightweight of the automobile body. Based on the existing lightweight methods, this paper starts from the materials and welding process, uses high-strength steel to replace the traditional low-carbon steel plate, and adopts laser welding instead of the traditional welding method to improve the body structure to achieve lightweight. The finite element theory is mainly used to simulate the welding process and analyze the distribution of the temperature field and the stress field in the welding process, and the effect of the welding process parameters on the welding results. The main content of this paper is:
(1) Analyze the huge practical significance and possible solutions of vehicle weight reduction.
(2) Establishing model data for the welding process.
(3) Dynamicly simulating welding process by computer software.
(4) Analyze welding results and influence parameter parametersKey words: auto body weight. reduction; laser welding; DP600 high strength steel;temperature field;stress field.
Key words: auto body weight reduction; laser welding; DP600 high strength steel;temperature field;stress field
目录
第1章 绪论 1
1.1汽车车身轻量化研究的背景及意义 1
1.2汽车车身轻量化的重要实现方法 5
1.3汽车车身轻量化的研究现状 6
1.4激光焊接技术在汽车轻量化研究中的应用 10
1.5本文主要研究内容 12
第2章 车身轻量化设计理论基础和方法 13
2.1激光及激光焊接技术概述 13
2.2有限元基本理论 17
2.3有限元分析软件ANSYS 18
2.4 激光焊接温度场的有限元理论 19
2.5焊接热应力的有限元理论 23
第3章 有限元模型的建立 26
3.1．汽车白车身模型的建立 26
3.2确定热源模型 26
3.3焊接部位的选择及模型简化 27
3.4焊接材料基本参数的确立 28
3.5焊接模型网格的划分 29
第4章 DP600高强钢激光焊接模拟结果分析 33
4.1 DP600高强钢激光焊接过程中温度场云图结果分析 33
4.2工艺参数对DP600高强钢激光焊接模拟的影响 40
4.3 DP600高强钢激光焊接应力场的仿真结果分析 41
第5章 激光焊接的实验验证 46
5.1 实验所用的材料及仪器设备 46
5.2 实验方法 47
5.3 模拟结果与实验结果对比分析 48
第6章 总结与展望 51
6.1总结 51
6.2展望 51
参考文献 52
致 谢 56
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