汽车发动机小覆盖件冲压工艺及模具设计（本科毕业论文设计）.doc

摘 要
板料冲压成形是一种重要的塑性加工方法，在现代汽车工业中的应用越来越广泛，汽车行业日益激烈的竞争，不仅要求提高冲压的生产效率，而且对冲压生产工艺的优化控制提出了更高的要求。因此，冲压工艺技术方法的不断完善和提高，一直是板料成形技术的研究热点。随着计算机软硬件技术，计算机图形学等学科的迅猛发展、CAD技术已成为产品设计人员进行研究开发的重要工具，其中的三维造型技术已被制造业广泛应用于产品及模具设计、方案评审、自动化加工制造及管理维护各个方面。
本次毕业设计汽车发动机小覆盖件为研究对象。根据给定的三维实体模型，对零件的几何外形和结构进行分析以确定其成形过程中需要的成形方法。然后，以冲压工艺手册等大量参考资料为依据，通过计算和分析对成形方法的可行性进行验证。在确定单工序之后，根据各工序的自身特点确定成形次数和工序的复合方式，然后利用三维建模软件UGNX画出其变形工部图并计算其毛坯尺寸，从而减少笔算的误差和工作量。最后，利用模具设计2D、3D CAD软件，对模具关键部件进行三维造型，用于模具制造和模具绘图。
通过这次毕业设计，在巩固以前所学知识的基础上，对冲压技术、模具设计、模具制造及计算机辅助设计和计算机仿真技术等方面的知识有了进一步的深入学习。所设计的模具能够达到实际使用要求，为该产品的成功开发提供技术保证。

关键词：板料冲压；模具设计；冲压工艺分析；计算机辅助设计；覆盖件














ABSTRACT
Sheet stamping is the most important plastic working method and it's applied to automobile widely more and more. With the increasingly drastic market competition in automobile industry, it requires not only high production efficiency, but also optimized control on the production process. So the continuous improvement of sheet stamping technique and process has been there search hotspot of sheet forming all along. With the swift and violent development of computer hardware and software, finite element method and computer graphics, the computer aided engineering (CAE) technology based on numerical simulation is widely used in sheet forming field.
The part this paper designed is the Controls Engineering. According to the three-dimensional solid model, the geometric shape and structure of the part was analysis to certain the forming method in the forming process of pars. Then, based on the large amount of reference material, the validation of forming methods was designed by calculation and analysis .In according with the characteristics of every process, the frequency and manner of composite process can be curtained, after determining the single operation. Then, every step of three-dimensional diagram was painted with 3D modeling software UGNX, to express a reasonable representation of its process. Finally, using 2D mold design, 3D CAD software, the mold 3D modeling of the key components can be painted for mold and die manufacturing drawings.
Through this graduation project, in the consolidation of previous knowledge on the basis of stamping technology, tooling design, Die manufacturing and computer-aided design and computer simulation technology, and other aspects of knowledge has been further in-depth study. Die designed to achieve actual use requirements for the successful development of products providing technical assurance.

Key words：Sheet stamping; Die design; Analysis for stamping technology;
Computer aided design; Panel







目 录

中文摘要 Ⅰ

ABSTRACT Ⅱ

1绪论 3
1.1 引言 3
1.2冲压技术的现状及发展方向 3
1.3覆盖件工艺特点 5
1.4课题最终任务及研究内容 6
1.4.1本课题的最终任务 6
1.4.2课题研究内容 6

2 零件的冲压工艺性分析 8

3 工艺方案 9
3.1工艺方案的选择 9
3.2排样形式和材料利用率的计算 9
3.2.1排样 9
3.2.2变形工步图 10


4 工艺及模具设计 11
4.1落料冲孔模 11
4.1.1毛坯尺寸的确定 11
4.1.2落料冲孔的工艺设计 12
4.2拉深冲孔翻边压筋模 19
4.2.1工艺计算 19
4.2.2主要零件设计 24
4.3模具制造要求的确定 25
4.3.1模具材料的选用 25
4.3.2模具热处理 25
4.3.3模具表面粗糙度及加工配合精度 25
4.4模具成本核算 26

5 结论 28

致谢 29

参考文献 30