毕业论文：《4缸连杆发动机的设计》.docVIP

精品 PAGE 精品 摘 要 连杆是发动机运动的主要关键件之一，它工作的稳定性、可靠性对发动机的整机质量至关重要，质量轻、精度高的连杆，有助于降低柴油机的能耗和噪声。 连杆是发动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。分析了如何对连杆加工基准进行合理选择；如何确定夹紧力的方向和着力点；如何合理选择连杆各部位加工方式及工艺流程；给出了各工序加工余量的确定方法；并重点分析了影响连杆加工精度的主要原因。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； 加工工艺； 变形； 夹具设计 ABSTRACT The connecting rod is one of important part in diesel engine，the stability and reliability of it are very important to machine quality of diesel engine，the light quality and high precision of connecting rod，is helpful to reduce energy consumption and the noise of diesel engine． 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 paper analyzed how to reasonable choice benchmark of processing；and how to determine the direction and point of clamping force；and how to reasonably choose various spots processing way and the technical process of connecting rod；and to give the definite method of various processes machining allowance；and to important analyses the primary cause of influence connecting rod working accuracy．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, can reach the specification requirement for the part finally. Keywords：Connecting rod; Processing technology；Deformation; Design of clamping device 目 录 TOC \o 1-3 \h \z \u 1 绪论 h 1 2 发动机工作原理 h 1 3 发动机连杆工艺设计 h 3 3.1 发动机连杆结构特点分析 h 3 3.2 连杆的主要工艺技术要求 h 4 3.3 连杆的材料及毛坯 h 5 3.4 发动机连杆的机械加工概况 h 6 3.5 发动机连杆加工工艺规程设计 h 7 3.6 连杆加工工艺设计分析 h 11 3.7 切削用