机械5

外壳-前刹车调整臂的机械加工工艺及钻Ф12孔夹具设计 摘要 本次设计内容涉及了机械制造工艺及机床夹具设计、金属切削机床、公差配合与测量等多方面的知识。 外壳-前刹车调整臂的机械加工工艺及钻削Ф12圆柱孔夹具设计是包括零件加工的工艺设计以及钻床专用夹具的设计两部分。在工艺设计中要首先对零件进行分析，了解零件的工艺再设计出毛坯的结构，并选择好零件的加工基准，设计出零件的工艺路线；接着对零件各个工步的工序进行尺寸计算，关键是决定出各个工序的工艺装备及切削用量；然后进行专用夹具的设计，选择设计出夹具的各个组成部件，如定位元件、夹紧元件、引导元件、夹具体与机床的连接部件以及其它部件；计算出夹具定位时产生的定位误差，分析夹具结构的合理性与不足之处，并在以后设计中注意改进。 关键词：外壳、前刹车调整臂、工艺、Ф12、钻床 Abstract This desig
n i
nvolves mecha
nical ma
nufacturi
ng tech
nology a
nd machi
ne tool fixture desig
n, metal cutti
ng machi
ne tools, tolera
nce fit a
nd measureme
nt a
nd other aspects of k
nowledge. The machi
ni
ng tech
nology of housi
ng-fro
nt brake adjusti
ng arm a
nd the desig
n of drilli
ng_12 cyli
ndrical hole clamp are two parts, which i
nclude the process desig
n of parts processi
ng a
nd the desig
n of special clamp for drilli
ng machi
ne. I
n the process desig
n, we must first a
nalyze the parts, u
ndersta
nd the process of the parts, the
n desig
n the structure of the bla
nk, a
nd select the processi
ng be
nchmark of the parts, the
n desig
n the process route of the parts. The desig
n of special fixture is carried out, a
nd each compo
ne
nt of fixture is selected, such as positio
ni
ng compo
ne
nt, clampi
ng compo
ne
nt, guidi
ng compo
ne
nt, co
n
necti
ng compo
ne
nt betwee
n fixture a
nd machi
ne tool, a
nd other compo
ne
nts; the positio
ni
ng error caused by fixture positio
ni
ng is calculated, the ratio
nality a
nd shortcomi
ngs of fixture structure are a
nalyzed, a
nd the
notes i
n future desig
n are give
n. It is i
nte
nded to be improved. Key words: shell, fro
nt brake adjusti
ng arm, craft, drill 12, drill press 目录 摘要I Abstract II 第一章绪论1 1.1机床夹具的发展概括1 1.2机床夹具的发展方向1 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、技术要求分析3 2.2.1零件的组成表面3 2.2.2零件的加工要求4 2.2.3零件的技术要求4 第三章零件的工艺规程设计5 3.1确定毛坯的制造形式5 3.2基准的选择与确定5 3.3加工工艺路线的确定6 3.3.1工艺路线方案一6 3.3.2工艺路线方案二6 3.3.3工艺路线的确定7 3.4加工机床及加工装备的选择7 3.5确定加工余量9 3.6计算切削用量及基本时间10 第四章钻削Ф12圆柱孔专用夹具设计25 4.1问题的提出25 4.2专用夹具设计25 4.2.1确定定位方案和定位元件25 4.2.2确定夹紧方案和夹紧元件26 4.2.3确定夹具体26 4.2.4选择与确定钻套27 4.2.5计算与分析钻削力和夹紧力28 4.2.6计算与分析定位误差29 结论30 致谢31 参考文献32