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摘 要

本篇毕业设计主要针对发动机连杆加工工艺及夹具设计的介绍，对连杆体零件进行工艺性分析，包括加工工艺的选择和制定，还包括各工序的切削用量及基本工时的计算等等。在拟定工艺过程当中，要肯定连杆大小头孔加工各工序的安设和该工步必要的工步，机床的进给量和该加工工序的机床，机床的主轴转速和切削速度跟切削的深度。

本次所设计的发动机连杆加工工艺及夹具设计，将会本着“高效”、“高质”的原则进行，通过对工件进行工艺分析，加工工艺方案的拟定到切削用量及基本工时的计算，随后就是夹具的设计等等。

关键词 连杆,工艺,进给量,夹具设计

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Abstract

This paper mainly introduced in honing rod machining process and fixture design of the size of the first hole, on the technical analysis of the connecting rod body parts, and the formulation includes selection of processing technology, including cutting consumption and basic man hour of each process calculation and so on. In the development process, make sure the process of connecting rod small head hole of installation and the steps necessary step, feeding machine and the processes of machine tools, machine tool spindle speed and cutting speed and cutting depth.

Honing rod mechanical processing technology and fixture design of the size of the first hole of the design, will be the spirit of \the technology of the workpiece, proposed to calculate cutting consumption and basic man hour process planning, fixture design, and then.

Key words：feed ,honing ,fixture,design

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目 录

绪 论 ........................................................ 1 第一章 工艺规程设计 .......................................... 1

1.1 连杆的加工工艺 .......................................................................................................... 2

1.1.1 确定毛坯的制作形式 ........................................................................................ 1 1.1.2 加工工艺方案的确定 ........................................................................................ 1 1.2 生产批量的确定 .......................................................................................................... 4 1.3 连杆机械加工工艺路线的制定 .................................................................................. 4

1.3.1 定位基准的选择 ................................................................................................ 6 1.3.2 加工经济精度和加工方法的选择 .................................................................... 5 1.3.3 工序顺序的安排 ................................................................................................ 6

第二章 确定机械加工工序卡内容 ................................ 7

2.1 机械加工余量及工序尺寸的确定 ........................................................................... 11 2.2 连杆珩磨小头孔工序图 ............................................................................................. 8 2.3 工时定额的计算 ....................................................................................................... 13

第三章 珩磨连杆大小头内孔夹具设计 ........................... 11

3.1 珩磨连杆大小头内孔夹具定位方案的设计 ........................................................... 11

3.1.1 珩磨连杆大小头内孔加工要求的分析 .......................................................... 11 3.1.2 工件在夹具中定位 .......................................................................................... 12 3.1.4 夹具在机床中定位 .......................................................................................... 13 3.1.5 加工精度的保证 .............................................................................................. 13 3.2 珩磨连杆大小头内孔夹具夹紧方案的设计 ............................................................ 13

3.2.1正确夹紧的原则 ............................................................................................... 13 3.2.3选择夹紧机构 ................................................................... 错误！未定义书签。 3.3 夹具总体方案设计分析 ............................................................................................ 14

3.3.1 夹具总体结构设计 .......................................................................................... 19 3.3.2 夹具总体结构分析 .......................................................................................... 14 3.4 夹具的使用说明 ........................................................................................................ 15 3.5 夹具的技术经济性 .................................................................................................... 21

结论 ........................................................ 22 参考文献 .................................................... 23 致谢 ........................................................ 17

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