连杆的机械加工工艺及夹具设计.doc

新乡职业技术学院 毕业设计（论文） 课 题 名 称　： 连杆的机械加工工艺及夹具设计 学 生 姓 名　： 学 号　： 院系、 专业 ： 机械制造系、机械设计与制造 指 导 老 师　： 2013 年 12 月 28 日内容摘要 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。 连杆是汽车发动机中的主要传动部件之一，它在柴油机中，把作用于活塞顶面的膨胀的压力传递给曲轴，又受曲轴的驱动而带动活塞压缩气缸中的气体。连杆在工作中承受着急剧变化的动载荷。连杆由连杆体及连杆盖两部分组成。连杆体及连杆盖上的大头孔用螺栓和螺母与曲轴装在一起。为了减少磨损和便于维修，连杆的大头孔内装有薄壁金属轴瓦。轴瓦有钢质的底，底的内表面浇有一层耐磨巴氏合金轴瓦金属。在连杆体大头孔和连杆盖之间有一组垫片，可以用来补偿轴瓦的磨损。连杆小头用活塞销与活塞连接。小头孔内压入青铜衬套，以减少小头孔与活塞销的磨损，同时便于在磨损后进行修理和更换。 关键词: 连杆 变形 加工工艺 夹具设计 Abstract The connecting rod is one of the main driving medium of diesel engine, this text expounds mainly the machining technology and the design of clamping device of the connecting rod .The precision of size, the precision of profile and the precision of position, of the connecting rod is demanded highly, and the rigidity of the connecting rod is not enough, easy to deform, so arranging the craft course, need to separate the each main and superficial thick finish machining process. Reduce the function of processing the surplus,cutting force and internal stress progressively, revise the deformation after processing, can reach the specification requirement for the part finally Automobile engine connecting rod is one of the main driving part, it in diesel engine, in the role of the piston top of inflation pressure on to the crankshaft, and of the crankshaft is driven by the drive and the piston compressor cylinder of gas. Connecting rod in the work under a drastic dynamic load. Connecting with the piston pin small head with piston connection. Small head hold pressure into the bronze bushing, small head to reduce the wear and tear of the piston pin hole, facilitate at the same time in the repair and replacement after wearing. Keyword: Connecting rod Deformation Processing technology Design of clamping devic 目　录 内容摘要 I Abstra