车床支架机械加工工艺及夹具设计.docVIP

本科毕业设计（论文）通过答辩 网络教育学院 本 科 生 毕 业 论 文（设 计） 题 目：车床支架机械加工工艺及夹具设计 学习中心： 层 次： 专科起点本科 专 业： 年 级： 年 春/秋 季 学 号： 学 生： 指导教师： 完成日期： 年 月 日 本科毕业设计（论文）通过答辩 I 摘要 本设计上车床支架零件的加工工艺规程及一些工序的专用夹具设计，车床支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。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。主要加工工序安排是先加工出底平面，再以底平面定位加工出各个孔系。整个加工过程选用组合机床，夹具选用专用夹具，夹紧可靠，机构可以不必自锁。因此生产效率较高。适用于中批量，流水线上加工，能够满足设计要求。 设计的重点是夹具的设计，由于工件上的孔系都要以底面作为基准加工，故首先得加工出底面，为保证孔的位置和加工准确性我们一定要在加工底面的时间通过画线找出底面的加工余量。这样就可以更好的保证孔系的位置和加工精度。因此工序一中的专用夹具的制造显得尤为重，本次夹具设计中对工序一中铣削夹具进行了设计，提供了一套可使用于中批量生产的，经济性和实用性均良好的夹具设计方案。 关键词： 车床，支架，工艺规程，夹具 本科毕业设计（论文）通过答辩 I 目 录 内容摘要 ………………………………………………………………………………1 引 言 ······································································································································ 1 1 绪论 ········································································································································ 1 2 工艺设计 ································································································································ 2 2.1机械加工工艺过程基本知识………………………………………………………………2 2.2机械加工工艺规程的内容······························································································· 3 2.3题目来源 ······················································································································· 6 2.4零件的分析 ··················································································································· 6 2. 5工艺过程设计 ………………………………………………………………8 3 夹具设计 ·····························································································································