课 题：专 题：
西安航空职业技术学院
毕 业 设 计（论 文）
毕业设计
叉架零件的机械加工工艺的编制及重要工序
工艺装备的设计
专 业： 机械制造及自动化
学 生 姓 名： 班 级： 学 号： 指 导 教 师： 完 成 时 间：
I
摘 要
叉架零件的主要加工表面是平面及孔系。一般来说，保证平面的加工精度要比保证孔系的加工精度容易。本设计是基于叉架零件的加工工艺规程及一些工序的专用夹具设计。因此，本设计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孔系加工精度。基准选择以叉架的输入轴和输出轴的支承孔作为粗基准，以底面与两个工艺孔作为精基准。主要加工工序安排是先以支承孔系定位加工出顶平面，再以顶平面与支承孔系定位加工出工艺孔。在后续工序中除个别工序外均用顶平面和工艺孔定位加工其他孔系与平面。支承孔系的加工采用的是坐标法镗孔。整个加工过程均选用组合机床。夹具选用专用夹具，机构可以不必自锁，因此生产效率较高，适用于大批量、流水线上加工，能够满足设计要求。
关键词：叉架类零件；工艺；夹具；
II
ABSTRACT
The main processing surface foot seat parts is the plane and a series of hole. In general, ensure the machining accuracy of plane than to ensure the accuracy of the processing easily. This design is the special fixture for machining technology for the foot seat parts and process design based on. Therefore, the design follows the surface after the first hole principle. And the hole and the plane processing clearly divided into roughing and finishing stages to ensure machining precision. The supporting hole datum selection to the foot seat of the input shaft and output shaft as a rough benchmark, the bottom surface and the two holes as a precision technology base. The main process of machining technology is first to support hole positioning processing the top plane, and then the top plane and the series of supporting hole location hole processing technology. In addition to the follow-up processes are individual processes with the top plane positioning technology and other processing Kong and plane. Processing support holes using the coordinate boring. The whole process selection of combined machine tool. Clamp by, agencies can not self-locking, therefore the production efficiency is high, suitable for large batch, line processing, can meet the design requirements.
Keywords: foot seat parts; technology; fixture;
III
叉架工艺及夹具设计
