机械5

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、夹紧元件的选择等。 本次设计研究的对象是万向接头。设计内容包括2个方面：1、工艺分析；2、钻2-Ф3孔钻床专用夹具设计。万向接头是传动装置中重要的零件，为连接两零件传递相应的转速、运动和动力。 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，设计了车削、铣削和钻削。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等。 关键词：万向接头、工艺、钻2-Ф3孔、钻床、专用夹具 Abstract I
n the curre
nt fast-movi
ng eco
nomy, the 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. More a
nd more commo
n fixtures desig
ned i
n the past are faci
ng elimi
natio
n. Therefore, the desig
n a
nd productio
n of special fixtures is more a
nd more exte
nsive. The mai
n co
nte
nts of the research of special fixtures i
nclude positio
ni
ng scheme, determi
natio
n of clampi
ng scheme, selectio
n of positio
ni
ng compo
ne
nts a
nd clampi
ng compo
ne
nts. The object of this desig
n study is the u
niversal joi
nt. The desig
n co
nte
nt i
ncludes two aspects: 1. Process a
nalysis; 2. Special fixture desig
n for drilli
ng 2-Ф3 hole drilli
ng machi
ne. The u
niversal joi
nt is a
n importa
nt part of the tra
nsmissio
n a
nd tra
nsmits the correspo
ndi
ng speed, motio
n a
nd power to co
n
nect the two parts. Starti
ng from the a
nalysis of the structure of the parts, reaso
nable selectio
n of the positio
ni
ng refere
nce, selectio
n ofvarious tool parameters a
nd selectio
n of cutti
ng amou
nt. Tur
ni
ng, milli
ng a
nd drilli
ng are desig
ned accordi
ng to the machi
ni
ng requireme
ntswhe
n arra
ngi
ng the process. I
n additio
n, the cutti
ng parameters, processi
ng time, a
nd process card a
nd process card are also determi
ned. The special fixture desig
n co
nte
nt i
ncludes: 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. Keywords: u
niversal joi
nt, process, drill 2-Ф3 hole, drilli
ng machi
ne, special fixture 目录 摘要I Abstract II 第1章绪论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夹具设计的基本要求3 第2章零件的作用、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5 2.4零件的形位公差5 第3章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7 3.2.1粗基准的选择与确定7 3.2.2精基准的选择与确定8 3.3加工工艺路线的确定9 3.4加工设备及加工装备的选择10 3.5确定加工余量11 3.6计算切削用量及加工工时12 第4章专用夹具的设计25 4.1定位方案及装置的确定25 4.1.1设计定位方案应满足的要求25 4.1.2定位方案的确定25 4.1.3定位元件的确定25 4.2夹紧方案及装置的确定26 4.2.1设计夹紧装置应遵循的原则26 4.2.2夹紧装置满足的基本要求26 4.2.3夹紧方案的确定27 4.2.4夹紧元件的确定27 4.3夹具体的设计27 4.4对刀装置—钻套的选择28 4.5计算钻削力28 4.6计算夹紧力29 4.7分析与计算定位误差29 结论31 致谢32 参考文献33