摘 要

在汽车车身焊接过程中，由于各种限制必须利用杠杆-铰链夹紧机构实现冲压件的孔定位或型面定位。对其选用设计标准化，缩短设计周期，降低设计成本具有重要意义。大量的操作需要装夹，夹具显得尤为重要，夹具是指机械加工、热处理及装配等工艺过程中为了安装加工工件，使之占有正确位置，以保证零件和产品的质量，并提高生产效率所采用的工艺装配。好的夹具设计直接影响了加工质量，生产效率及制造成本等。本文介绍了基于UG的汽车装焊夹具模块的设计与仿真，首先要确定夹具模块的结构，然后进行结构的受力分析，设计过程中先给定后校核不断调整，进行运动仿真和数值模拟。

关键词：汽车；车身焊接；气动夹具；UG。

Abstract

In the automobile body welding process, because of all kinds of restrictions, we must use the lever hinge clamping mechanism to realize the hole location or the surface location of the stamping parts.It has important significance to select design standardization, shorten design cycle and reduce design cost.A large number of operations need to be installed, the fixture is particularly important, Fixture refers to the mechanical processing, heat treatment and assembly process in order to install the processing of the work piece, so that it occupies the correct position, to ensure the quality of parts and products, and improve the production efficiency of the process assembly，a direct impact on the quality of processing, production efficiency and manufacturing costs, etc.This article introduces the design and Simulation of welding fixture modules based on UG assembly to determine module fixture structure, at first structure stress analysis, and then design process first given after checking constantly adjust, motion simulation and numerical simulation.

Key words：Car；Body welding；Pneumatic clamp；UG

目录

第1章 绪论............................................................................................................... 7

第2章 夹具的设计................................................................................................... 9

2.1夹紧装置的组成与要求.................................................................................. 9

2.2夹具设计原则.................................................................................................. 9

2.3定位原理......................................................................................................... 10

2.4定位基准......................................................................................................... 10

2.5定位方案设计方法与步骤............................................................................. 11

2.6夹具设计流程................................................................................................. 11

1. 固定式气动杠杆（三杆机构）夹具的设计............................................... 13

3.1 气缸简介........................................................................................................ 13

3.2 活塞杆上输出力和缸径的计算.................................................................... 13

3.3 基于UG的部分零部件的设计........................................................................16

3.3.1 夹紧杆的设计........................................................................................ 16

3.3.2 连接杆的设计........................................................................................ 16

3.3.3 底座的设计............................................................................................ 17

3.3.4 气缸与活塞杆的设计............................................................................ 18

3.3.5 其它小型零部件的设计........................................................................ 19

3.4 基于UG的零部件装配与运动仿真.............................................................. 19

第4章 校核.............................................................................................................. 21

4.1杠杆的校核..................................................................................................... 21

4.2 连接板的校核................................................................................................ 22

4.3 底座的校核.................................................................................................... 23

第5章 固定式气动夹紧装置的设计...................................................................... 24

5.1 输出力和缸径的计算.................................................................................... 24

5.2 基于UG的结构设计...................................................................................... 24

5.2.1 夹紧杆的设计........................................................................................ 24

5.2.2 连接杆的设计........................................................................................ 24

5.2.3 底座的设计............................................................................................ 25

5.2.4 气缸与活塞杆的设计............................................................................ 25

5.2.5 其它小型零部件的设计........................................................................ 27

5.3 基于UG的零部件装配与运动仿真.............................................................. 27

5.4 校核................................................................................................................ 28

5.4.1 夹紧杆的校核........................................................................................ 28

5.4.2 连接板的校核....................................................................................... 29

1. 结论............................................................................................................. 31

参考文献......................................................................................................... 33

致谢................................................................................................................. 34

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