机械5

摘要 凸轮轴是汽车上非常重要的零件之一，位置位于汽车的发动机。该零件的作用是调节以及控制气门的闭合，开启及其调节启闭的工作角度等等。为汽车的正常工作提供保障。凸轮轴是比较典型的轴类零件，轴类零件应用非常广泛，从而对凸轮轴进行研究非常有必要。 这次设计的内容主要有凸轮轴加工工艺规程的设计和凸轮轴专用夹具的设计。在一开始对其进行设计的时候，主要研究的凸轮的作用，材料的选择，加工工艺路线的制定还有零件在加工的时候其切削用量的选择等等。 通过商定决定设计磨IV段凸轮磨床专用夹具设计。在对其进行设计之前，对磨床的组成、加工范围等知识点进行掌握；依据零件的结构特点设计了定位方案和夹紧方案并选择了相应的元件。对夹具体进行设计，画出装配图以及零件图等。 关键词：凸轮轴、工艺规程、专用夹具、IV段凸轮、磨床 Abstract The camshaft is o
ne of the most importa
nt parts of the car a
nd is located i
n the e
ngi
ne of the car. The fu
nctio
n of the part is to adjust a
nd co
ntrol the closi
ng of thevalve, ope
ni
ng a
nd adjusti
ng theworki
ng a
ngle of the ope
ni
ng a
nd closi
ng, a
nd the like. Provide protectio
n for the
normalwork of the car. Camshafts are typical shaft parts, a
nd shaft parts arewidely used, so it is
necessary to study camshafts. The desig
n of this desig
n mai
nly i
ncludes the desig
n of the camshaft machi
ni
ng process specificatio
n a
nd the desig
n of the camshaft special fixture. At the begi
n
ni
ng of the desig
n, the mai
n research of the role of the cam, the choice of materials, the developme
nt of the processi
ng route a
nd the selectio
n of the cutti
ng amou
nt of the parts duri
ng processi
ng. The desig
n of the special fixture for the gri
ndi
ng IV segme
nt cam gri
nderwas decided by agreeme
nt. Before desig
ni
ng it, master the k
nowledge poi
nts of the compositio
n a
nd processi
ng ra
nge of the gri
ndi
ng machi
ne; desig
n the positio
ni
ng scheme a
nd clampi
ng scheme accordi
ng to the structural characteristics of the parts a
nd select the correspo
ndi
ng compo
ne
nts. Desig
n the clip specifically, draw the assembly drawi
ng a
nd the part drawi
ng. Keywords: camshaft, process specificatio
n, special fixture, IV segme
nt cam, gri
nder 目录 摘要I Abstract II 第一章前言1 1.1生产过程与工艺过程的概述1 1.1.1生产过程的概述1 1.1.2工艺过程的概述1 1.2磨床及其加工的概述1 第二章设计零件加工工艺规程3 2.1零件的作用3 2.2零件组成表面、加工要求及形位公差分析3 2.3零件材料的选择和分析5 2.4确定零件生产类型5 2.5确定零件制造形式5 2.6确定加工基准5 2.7确定加工工艺路线6 2.7.1加工工艺路线选择6 2.7.2加工工艺路线比较与确定7 2.8确定机床、夹具、刀具及量具8 2.9确定机加工余量8 2.10确定切削用量及工时12 第三章设计专用夹具26 3.1确定定位方案26 3.2确定定位元件26 3.3确定夹紧方案26 3.4确定夹紧元件27 3.5设计夹具体27 3.6计算磨削力、夹紧力28 3.6.1计算磨削力28 3.6.2计算夹紧力28 3.7分析定位误差29 结论30 致谢31 参考文献32