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。 方形件加工工艺规程及其工装的夹具设计是包括零件加工的工艺设计、工序设计以及专用夹具的设计三部分。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：工艺、工序、切削用量、夹紧、定位、误差。 ABSTRCT This desig
n co
nte
nt has i
nvolved the machi
ne ma
nufacture craft a
nd the e
ngi
ne bed jig desig
n, the metal-cutti
ng machi
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nd the survey a
nd so o
n the various k
nowledge. The reductio
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nd its the processi
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ncludes the compo
ne
nts processi
ng the tech
nological desig
n, the worki
ng procedure desig
n as well as the u
nit clamp desig
n three parts. Must first carry o
n the a
nalysis i
n the tech
nological desig
n to the compo
ne
nts, u
nderstood the compo
ne
nts the craft redesig
ns the semi fi
nished materials the structure, a
nd chooses the good compo
ne
nts the processi
ng datum, desig
ns the compo
ne
nts the craft route; After that is carryi
ng o
n the size computatio
n to a compo
ne
nts each labor step of worki
ng procedure, the key is decides each worki
ng procedure the craft equipme
nt a
nd the cutti
ng specificatio
ns; The
n carries o
n the u
nit clamp the desig
n, the choice desig
ns the jig each compositio
n part, like locates the part, clamps the part, guides the part, to clamp co
ncrete a
nd the e
ngi
ne bed co
n
nectio
n part as well as other parts; Positio
n error which calculates the jig locates whe
n produces, a
nalyzes the jig structure the ratio
nality a
nd the deficie
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nd will desig
n i
n later pays atte
ntio
n to the improveme
nt. Keywords: The craft, the worki
ng procedure, the cutti
ng specificatio
ns, clamp, the localizatio
n, the error 目录 ABSTRCT 3 序言1 一.机床夹具介绍2 1 .1夹具的现状及生产对其提出新的要求2 1.2现代夹具的发展方向3 二.零件的分析5 2.1零件的作用5 2.2零件的工艺分析5 三.毛坯的确定8 3.1确定毛坯的制造形式8 3.2毛坯形状及尺寸9 四拟定加工工艺路线10 4.1基准的选择10 4.1.1粗基准选择10 4.1.2精基准的选择11 4.2制定工艺路线12 五零件加工工序设计14 5.1铸造14 5.2时效处理14 5.3铣削上端面14 5.4钻4-Φ3 15 5.5铣削下端面16 六机床夹具的定位及夹紧18 6.1概述18 6.1.1机床夹具的概念18 6.1.2机床夹具的组成18 6.1.3机床夹具的分类19 6.1.4机床夹具在机械加工中的作用21 6.2工件的装夹方式22 6.3基准及其分类23 6.4工件的定位25 6.4.1工件定位的基本原理25 6.4.2常见定位方式及定位元件26 6.5工件的夹紧27 6.5.1夹紧装置的组成及基本要求27 6.5.2夹紧力的确定28 6.5.3典型夹紧结构29 6.5.4定心夹紧机构29 6.6专用夹具设计30 6.6.1对机床专用夹具的基本要求30 6.6.2专用夹具设计方法和步骤30 6.6.3夹具总图技术要求的制订31 七夹具设计33 7.1问题的提出33 7.2定位基准的选择33 7.3切削力及夹紧力计算34 7.4定位误差分析35 7.5夹具设计及操作简要说明36 总结37 致谢39 参考文献40