1、专科毕业设计(论文) 题 目 175型柴油机连杆制造工艺及镗大头孔的工装设计 175型柴油机连杆制造工艺及镗大头孔的工装设计摘 要 连杆是柴油机的主要传动件之一,本文主要论述了连杆的加工工艺及其夹具设计。连杆的尺寸精度、形状精度以及位置精度的要求都很高,而连杆的刚性比较差,容易产生变形,因此在安排工艺过程时,就需要把各主要表面的粗精加工工序分开。逐步减少加工余量、切削力及内应力的作用,并修正加工后的变形,就能最后达到零件的技术要求。关键词 连杆/变形/加工工艺/夹具设计175 Type Diesel Engine Connecting RodManufacturing Process And
2、Boring Big Fole Tooling DesignABSTRACT Connecting rod is one of main transmission parts of diesel engine, the paper mainly discusses the processing technology of the connecting rod and fixture design. Connecting the size accuracy, precision and shape of the position precision requirements are very h
3、igh, and connecting rod rigidity is poorer, easy to generate distortion, so in arrangement process, would be necessary to major surface of rough finish machining processes apart. Gradually reduce machining allowance, cutting force and the role of stress, and fix the processed deformation, can finall
4、y achieved the components the technical requirements.KEY WORDS connecting rod/deformation/processing/fixture design目 录中文摘要 英文摘要 1 前言12 连杆零件的工艺规程设计3 2.1 连杆零件分析 3 2.1.1 连杆零件结构分析 32.1.2 2.2 2.3 连杆的机械加工工艺过程分72.3.1 工艺过程的安排72.3.2 定位基准的选择82.3.3 确定合理的夹紧方法92.3.4定位基准92.3.5 92.3.6 2.4 2.4.1 确定机械加工余量132.4.2 选择工
5、艺设备162.5 切削用量的选择原则162.6 确定各工序的加工余量、计算工序尺寸及公差182.6.1 确定加工余量182.6.2 确定工序尺寸及其公差 192.7工时定额的计算 192.7.1粗镗大头孔192.7.2半精镗大头孔192.7.3精镗大头孔202.7.4珩磨大头孔203 专用夹具的设计223.1 连杆镗大头孔的夹具设计22 3.1.1 镗床夹具定位方案的确定223.1.2 镗床夹具的夹紧机构的确定233.1.3 镗床夹具对刀装置的确定233.1.4 镗床夹具的结构分析24结束语26致谢27参考文献 28(附录)29 选用镗床T68根据机械制造工艺设计手册表2.466选取数据铣刀直径D = 65 mm 切削速度V = 0.16 m/s进给量f = 0.30 mm/r 切削深度ap = 3.0 mm