上理箱体机械加工工艺及夹具设计.doc

宁 机械制造技术课程设计任务书 班 级: 111 学 号： 11 姓 名： 11 指导老师： 11 一、 设计题目： 减速箱体机械加工工艺及工装夹具设计 及铣侧面专用夹具设计 二、 设计内容： 1. 绘制夹具装配图 2. 绘制夹具非标零件图 3. 拟定夹具非标零件的机械加工工艺过程 4. 编写设计计算说明书 摘 要 本文是在减速箱体的图样分析后进行减速箱体的机械加工工艺路线的设计，同时按照其中的加工工序的要求设计夹具。 减速箱体的主要加工内容是表面和孔。其加工路线长，加工时间多，加工成本高，零件的加工精度要求也高。按照机械加工工艺要求，遵循先面后孔的原则，并将孔与平面的加工明确划分成粗加工和精加工阶段以保证加工精度。基准选择以底面作为粗基准，以底面与两个工艺孔作为精基准，确定了其加工的工艺路线和加工中所需要的各种工艺参数。 在零件的夹具设计中，主要是根据零件加工工序要求，分析应限的自由度数，进而根据零件的表面特征选定定位元件，再分析所选定位元件能否限定应限自由度。确定了定位元件后还需要选择夹紧元件，最后就是确定专用夹具的结构形式。 关键词:减速箱体；加工工艺；工序；专用夹具 Abstract This article is in the design analysis conducted B Case B Case machining process route design, while according to the requirements of the design process in which the processing jig. The main content of the processing tank B is a surface and the hole. Its processing line long processing times and more, high processing costs, machining precision parts is high. In accordance with the requirements of the machining process, follow the principle of surface after the first hole, and hole machining and the plane clearly divided into roughing and finishing stages in order to ensure accuracy. Select to the bottom surface of the base as a crude reference to the bottom surface of the hole as a fine reference both processes, determine the route of its processing technology and the various process parameters required for processing. In fixture design parts, the main part is based on the requirements of the processing step, the analysis should be limited to the number of degrees of freedom, and then depending on the surface characteristics of the part of the positioning element is selected, and then analyze whether the selected positioning element defines should limit freedom. Determine the positioning element after clamping elements also need to choose, it is to determine the final form of the structure of th