倒档拨叉说明书.pdf

摘 要 这次的毕业设计主要涉及拨叉的机械制造的工艺和专用夹具的设计。 根据倒挡拨叉的零件图来分析其精度、表面粗糙度、技术要求、加工部位尺寸、形 状结构及零件的批量生成，确定被加工零件工艺方法和工艺过程，并选择好倒挡拨叉的 加工基准，设计出倒挡拨叉的工艺路线；接着对倒挡拨叉各个工步的工序进行尺寸计算， 关键是决定出各个工序的工艺装备及切削用量和基本工时；然后进行专用夹具的设计， 在选择设计出夹具中，本次针对倒挡拨叉的工艺确定设计两套夹具。这次我设计两套夹 具分别是铣叉口两侧面的夹具和铣槽夹具。在设计夹具过程中，需要考虑的是如定位元 件、夹紧元件、夹具体、对刀件以及其它部件；计算出来夹具定位时所产生的定位误差， 分析夹具结构的合理与不足之处，并在以后设计中不断改进。 关键词：倒挡拨叉；工装夹具；工艺规程 湖南科技大学本科生毕业设计（论文） A bstract This design content relates to the mechanical manufacturing technology and the technology of the shifting fork fixture design content. Based on the analysis of its accuracy, surface roughness, technical requirements, the batch processing spot size, shape structure and parts of the generation of the fork of the parts diagram, identify processing technology method of parts and process, and the choice of processing benchmark good fork, the fork of the design process is obtained; then the fork each step process calculation of dimensions, the key is to determine the craft equipment and the cutting parameters and the basic working hours each working procedure; then design the special fixture, in the choice of design fixture, the process of shifting fork to determine the design of two sets of fixture. The two sets of clamps are slot milling jig and fixture for slot. Fixture in the design process, need to consider is if the positioning element, clamping element, clamp, tool parts and other components; calculate fixture positioning errors when positioning, analysis the rationality and deficiency of fixture structure, pay attention to improving and will design in. Key word: Gear chamber cover, fixture, process specification. 湖南科技大学本科生毕业设计（论文） 目 录 第一章 绪论3 1.1 设计目的3 1.2 研究的内容和意义3 1.3 目前国内外存在的现状及存在的问题3 第二章 零件的分析5