摘 要
机械制造业是一个国家技术进步和社会发展的支柱产业之一，无论是传统产业，还是新兴产业，都离不开各式各样的机械设备。这次毕业设计就是选择了这样一个课题——对东方红拖拉机的变速箱箱体加工工艺路线和其中粗镗轴承孔工序的夹具设计进行研究。在机加工工艺编制方面，主要通过仔细分析产品零件图和相关技术要求，查阅箱体类零件相关资料，考虑了的工艺结构要求、批量要求、经济性、可行性等多方面因素，最终安排了18个工序来完成变速箱体的加工，其中包括各道工序的加工方法，机床、刀具、夹具、辅具、量具的选择，基准面的选取，定位和夹紧方案的拟定。另外，在夹具设计方面，主要就粗镗轴承孔这个工序进行了夹具方案的分析，计算和最终敲定。
关键字：轴承孔  工序卡  工艺路线    夹具设计
ABSTRACT
Machinery manufacturing is one of the pillar industries which show a nation’s development of technology and society. Both traditional and burgeoning industries can’t be separated from verities of mechanical equipment. This disquisition had just selected such a task—to study the machining process rout and the fixture for heavy boring shafting bearing holes of Dongfanghong tractor. In the aspect of machining craft， part drawing and the technological request were thought over， with the help of some information about the machining craft of parts such as boxes it is arranged to produce the part in eighteen steps which include the information on what means to use， which machine tools， what fixtures， assist tools and measure tools needed in each step. Then selected datum plane for each step， studied out orientation and clamping scheme for each step. in the aspect of fixture designing，I had designed a set of fixture for the heavy boring of the shafting bearing holes. After some analyzing and calculating，
Keyword: bearing holes  Operation sheet  Process route  Fixture designing
东方红汽车