毕业论文柴油机连杆加工工艺设计.doc

摘要 连杆机构中两端分别与主动和从动构件铰接以传递运动和力的杆件。例如在往复活塞式动力机械和压缩机中，用连杆来连接活塞与曲柄。连杆多为钢件，其主体部分的截面多为圆形或工字形，两端有孔，孔内装有青铜衬套或滚针轴承，供装入轴销而构成铰接。连杆是汽车发动机中的重要零件，它连接着活塞和曲轴，其作用是将活塞的往复运动转变为曲轴的旋转运动，并把作用在活塞上的力传给曲轴以输出功率连杆在工作中，除承受燃烧室燃气产生的压力外，还要承受纵向和横向的惯性力。因此，连杆在一个复杂的应力状态下工作。它既受交变的拉压应力、又受弯曲应力。连杆的主要损坏形式是疲劳断裂和过量变形。通常疲劳断裂的部位是在连杆上的三个高应力区域。连杆的工作条件要求连杆具有较高的强度和抗疲劳性能；又要求具有足够的钢性和韧性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部分工序夹具设计。确定加工的生产纲领及生产类型；确定的毛坯材料及尺寸，确定毛坯加工余量；设计加工工艺；确定部分重要工序所用的工艺装备和设备；计算部分重要工序的切削用量和基本时间；设计重要工序所用的夹具。连杆的尺寸精度、形状精度以及位置精度的要求都很高，而连杆的工作环境恶劣，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，才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Abstract At both ends of linkage with the active and passive components in order to convey movement and the hinged edge of the bar. For example, in reciprocating piston compressor and power machinery, to connect the piston with connecting rod and crank. Connecting rod for steel parts, the main part of the cross section for the round or shaped, both ends have a hole or holes with needle bearing bronze bushing for the pin into and constitute a hinged axis. Linkage is an important automotive engine parts, it is connected to the piston and the crankshaft, its role is to the reciprocating piston movement into rotary movement of the crankshaft, and the role of the force in the piston to the crankshaft to the output power. Link at work, in addition to gas produced by the combustion chamber under pressure, also have to face the vertical and horizontal inertia force. Therefore, the connecting rod in a complex work under the stress state. It is subject to alternating stress of tension and compression, but also by the bending stress. Link the main form of fatigue damage and excessive deformation. Usually the site of fatigue fracture in the connecting rod on the three regions of high stress. Requirements of the working conditions of connecting rod connecting rod has higher strength and fatigue performance; also requires adequate and toughness of steel.The connecting rod is