xz2550变速箱箱体工艺规程、数控编程与组合夹具设计.doc

XZ2550变速箱箱体工艺规程、数控编程与组合夹具设计

摘  要
在制造业信息化环境中，工艺设计是生产技术准备工作的第一步，工艺规程是进行工装设计制造和决定零件加工方法与加工路线的主要依据，它对组织生产、保证产品质量、提高劳动生产率、降低成本、缩短生产周期及改善劳动条件等都有直接的影响，是生产中的关键工作。工艺知识是制造企业中重要的知识资源之一，是使产品设计变为成品的整个制造过程中的基础资源，它对保证产品质量以及提高企业经济技术效益具有十分重要的作用。
夹具的快速设计与制造，己经成为产品快速变换和制造系统新建成或重构后运行的瓶颈，严重地影响制造系统的设计建造周期、系统生产率、质量和成本。目前国内外使用的组合夹具是伴随着大批大量生产的发展而发展出现的，特别是和汽车工业的发展密切相关。组合夹具的使用，缩短了工序时间，降低了加工成本。因此，在何种生产条件下使用哪种类型的夹具才是经济合理的，也就是夹具的经济性，一直都是夹具结构发展和设计的一个主要问题。
这次我毕业设计的课题就是制造业中 XZ25.50 的箱体加工工艺及加工中心、组合夹具设计和数控编程。
关键字  工艺；加工中心；组合夹具；数控编程

Abstract
The manufacturing industry becoming an information based society environment, the process planning produces is the first step in the technology preparatory work, the process planning is carries on the work clothes design to make and to decide the components processing method with processes the route the main basis, it produces, guarantee product quality, the enhancement labor productivity to the organization, reduces the cost, reduces the production cycle and the improvement work condition and so on all has the direct influence, is in the production key work. The craft knowledge is makes in the enterprise one of important knowledge resources, is causes the product design to become the end product in the entire manufacture process foundation resources, it to guaranteed the product quality as well as enhances the enterprise economical technology benefit to have the extremely vital role.
The fast design and the manufacture, oneself after becomes the product fast transformation and the manufacture system completes the bottleneck newly which or the heavy construction moves, seriously affects manufacture system the design construction cycle, the system
productivity, the quality and the cost. At present the domestic and foreign uses modular fixture follows large quantities of mass productions development but to develop appears, specially with automobile industry development close correlation. Modular fixture use, reduced the working procedure time, reduced the processing cost. Therefore, which kind of type uses under what kind of working condition the jig is the economy reasonable, also is the jig efficiency, continuously all is the jig structure development and a design main question.
Topic of this study is in the manufacturing industry XZ25.50 box body processing craft and machining centers and the modular fixture design，and then the NC programming.
Key words  process planning  machining center  modular fixture  NC programming

 
目       录
序 言 
1 工艺分析 2
1.1 零件的分析 2
1.1.1 零件的功用 2
1.1.2 零件的工艺分析及技术要求 2
1.2 零件的工艺规程设计 5
1.2.1 确定零件的生产类型 5
1.2.2 确定零件的毛胚制造形式 5
1.2.3 定位基准的选择 5
1.2.4 拟订工艺路线 5
1.2.5 毛坯余量与工序余量的确定 6
1.2.6 确定主要表面的切削刀量及基本工时 7
2 数控编程 25
2.1 程序的编制 25
2.1.1 铣右端面 25
2.1.2 铣左端面 26
2.1.3 铣前端面 27
2.1.4 铣削后端面 28
2.1.5 镗有端面的两孔 29
2.1.6 镗左端面的两孔 30
2.1.7 钻左平面上的个螺纹孔，通孔并攻丝 31
2.1.8 钻右平面上的螺纹孔，通孔及攻丝 32
2.1.9 钻前端面各螺纹孔及攻丝 34
2.1.10 钻后端面上的各螺纹孔及攻丝 35
2.2 数控加工刀具卡 38
3 组合夹具 39
3.1 组合夹具及其应用特点 39
3.2 夹具设计 40
3.2.2 基准的概念 41
3.3 工件的夹紧 41
3.3.1 夹紧的概念 41
3.3.2 夹紧力的大小 42
3.3.3 切削力的计算 43
3.4 夹紧装置产生的夹紧力 44
3.4.1 螺旋直接夹紧装置 44
3.4.2 螺旋杠杆夹紧装置 44
3.5 定位元件的要求 45
3.5.1 定位元件 45
3.6 误差计算 45
3.6.1 一面两销 45
结 论 49
致 谢 50
参考文献 51
附录 52
英文原文 52
中文译文 60