凸轮杆设计工艺及夹具设计 摘要 在经济飞速向前的当下，制造业快速发展的今天。非标零件的尺寸、结构也千变万化。以往设计的通用夹具，越来越多的面临淘汰。所以专用夹具的设计与生产越来越广泛。专用夹具的研究其主要内容有定位方案、夹紧方案的确定，定位元件、夹紧元件的选择，导向装置的选择等等。 本次设计研究的对象是凸轮杆。设计内容包括2个方面：1、工艺分析；2、钻Ф20孔钻床专用夹具设计。凸轮杆是机器上不可或缺的零件之一，为机器及零部件的正常运转提供保障。 从零件结构分析入手，合理选择定位基准，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。专用夹具设计内容有：确定定位方案及元件，确定夹紧方案及元件，确定导向装置，计算切削力及夹紧力等。 关键词：凸轮杆、工艺、Ф20孔、钻床、专用夹具 Abstract With the rapid developme
nt of the eco
nomy, ma
nufacturi
ng i
ndustry is developi
ng rapidly today. The size a
nd structure of
no
n-sta
ndard parts are also ever-cha
ngi
ng. I
n the past, more a
nd more commo
n fixtures have bee
n elimi
nated. Therefore, the desig
n a
nd productio
n of special fixture are more a
nd more exte
nsive. The mai
n co
nte
nts of the research of special fixture i
nclude positio
ni
ng scheme, clampi
ng scheme determi
natio
n, positio
ni
ng eleme
nt, clampi
ng eleme
nt selectio
n, guidi
ng device selectio
n a
nd so o
n. The object of this study is the cam bar. The desig
n co
nte
nt i
ncludes 2 aspects: 1, process a
nalysis; 2, drill jig 20 hole drilli
ng special fixture desig
n. Cam rod is o
ne of the i
ndispe
nsable parts of the machi
ne,which provides guara
ntee for the
normal operatio
n of the machi
ne a
nd parts. Starti
ng from the a
nalysis of part structure, the locatio
n datum, tool parameters a
nd cutti
ng parameters are selected reaso
nably. 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. The desig
n co
nte
nts of special fixture i
nclude: determi
ni
ng the positio
ni
ng scheme a
nd compo
ne
nts, determi
ni
ng the clampi
ng scheme a
nd compo
ne
nts, determi
ni
ng the guidi
ng device, calculati
ng the cutti
ng force a
nd clampi
ng force, etc. Keywords: cam rod, process, 20 hole, drilli
ng machi
ne, special fixture 目录 摘要I Abstract II 1绪论1 1.1机床夹具的组成1 1.2机床夹具的分类1 1.3机床夹具的发展趋势2 1.4夹具设计的特点和基本要求3 1.4.1夹具设计的特点3 1.4.2设计的基本要求3 2零件的作用、组成表面及技术要求4 2.1零件的作用4 2.2零件的组成表面4 2.3零件的技术要求4 2.4零件的形位公差5 3零件的工艺分析及设计6 3.1确定零件的生产类型及毛坯的制造形式6 3.1.1确定零件的生产类型6 3.1.2确定毛坯的制造形式6 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加工设备及加工装备的选择7 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 4钻Ф20孔专用夹具设计28 4.1定位方案及装置的确定28 4.1.1设计定位方案应满足的要求28 4.1.2定位方案的确定28 4.1.3定位元件的确定28 4.2夹紧方案及装置的确定29 4.2.1设计夹紧装置应遵循的原则29 4.2.2夹紧装置满足的基本要求30 4.2.3夹紧方案的确定30 4.2.4夹紧元件的确定31 4.3夹具体的设计31 4.4确定导向装置—钻套32 4.5计算切削力32 4.6计算夹紧力32 4.7分析与计算定位误差33 5结论35 6致谢36 参考文献37