机械5

支座零件的加工工艺及铣120左端面专用夹具设计 摘要 夹具是零件加工的夹紧装置，是加工零件的一种必不可少的装置。随着零件的尺寸变化，越来越多的夹具被淘汰了，因此，设计一套专用夹具是十分有必要的。在设计专用夹具时要考虑工件的定位方案，工件的夹紧方案和设计夹紧机构，夹具的其他组成部分，夹具的结构形式等。 本课题的主要研究内容是支座零件的加工工艺及铣120左端面专用夹具设计。支座是安装轴承、轴等回转零件，对回转零件起支承作用，保持其平衡。 结合零件加工的重点和难点，从零件的结构分析入手，合理的进行定位基准选择、夹具的设计、各种刀具参数选择以及切削用量的选择等。在安排工艺过程时，根据加工要求不同，需要进行粗精加工。另外还确定了切削参数，加工工时，填写工艺过程卡片和工序卡片。设计了一套铣120左端面的铣床专用夹具。 关键词：支座、加工工艺、120左端面、铣床、专用夹具 Abstract Jig is the clampi
ng device for parts processi
ng,which is a
n esse
ntial device for processi
ng parts. With the cha
nge of the size of parts, more a
nd more fixtures are elimi
nated. Therefore, it is
necessary to desig
n a set of special fixtures. Whe
n desig
ni
ng the special fixture,we should co
nsider the positio
ni
ng scheme of theworkpiece, the clampi
ng scheme of theworkpiece a
nd the desig
n of the clampi
ng mecha
nism, other parts of the fixture, the structure of the fixture a
nd so o
n. The mai
n co
nte
nts of this subject are the processi
ng tech
nology of the beari
ng parts a
nd the desig
n of the 120 e
nd fixture for milli
ng. Beari
ng is to i
nstall beari
ngs, shaft a
nd other rotary parts, supporti
ng the role of rotati
ng parts, to mai
ntai
n its bala
nce. Combi
ni
ngwith the key a
nd difficult poi
nts of parts processi
ng, starti
ng from the structural a
nalysis of parts, reaso
nable selectio
n of positio
ni
ng datum, fixture desig
n,various tool parameters selectio
n a
nd cutti
ng parameters selectio
n. Whe
n arra
ngi
ng the tech
nological process, rough fi
nishi
ng is required accordi
ng to differe
nt processi
ng requireme
nts. I
n additio
n, cutti
ng parameters, machi
ni
ng hours, process process cards a
nd process cardswere determi
ned. Desig
ned a set of milli
ng 120 left e
nd milli
ng machi
ne special fixture. Keywords beari
ng, processi
ng tech
nology, 120 left e
nd face, milli
ng machi
ne, special fixture 目录 摘要I Abstract II 第一章绪论1 1.1机床夹具的概念1 1.2机床夹具的分类1 1.2.1按夹具的通用特性分类1 1.2.2按夹具的动力源分类2 1.3机床夹具的发展趋势2 第二章零件的分析3 2.1零件的作用3 2.2零件的组成表面、加工要求、形位公差分析3 2.2.1零件的组成表面3 2.2.2零件的加工要求4 2.2.3零件的形位公差4 第三章零件的工艺规程设计5 3.1确定零件的生产类型及毛坯的制造形式5 3.1.1确定零件的生产类型5 3.1.2确定毛坯的制造形式5 3.2基准的选择与确定6 3.3加工工艺路线的确定7 3.4加工机床及加工装备的选择8 3.5确定加工余量8 3.6计算切削用量、基本时间及辅助时间11 第四章铣120左端面专用夹具设计31 4.1定位方案及装置的确定31 4.1.1设计定位方案应满足的要求31 4.1.2定位方案的确定31 4.1.3定位元件的确定31 4.2夹紧方案及装置的确定32 4.2.1夹紧装置满足的基本要求32 4.2.2夹紧方案的确定32 4.2.4夹紧元件的确定33 4.3夹具体的设计33 4.4导向装置确定34 4.5铣削力的计算34 4.6夹紧力的计算34 4.7定位误差的分析与计算35 结论36 致谢37 参考文献38