机械5

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。 拨叉加工工艺规程及其钻Φ22孔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
ne tool,the commo
n differe
nce coordi
natio
n a
nd the surveya
nd so o
n thevarious k
nowledge. The shifti
ng fork tech
nological process a
nd its the processi
ng￠22 hole jig desig
n is i
ncludes the compo
ne
nts processi
ng the tech
nological desig
n,theworki
ng procedure desig
n aswell as the u
nit clamp desig
n three parts.Must first carryo
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 ofworki
ng procedure,the keyis decides eachworki
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 aswell as other parts; Positio
n errorwhich calculates the jig locateswhe
n produces,a
nalyzes the jig structure the ratio
nalitya
nd the deficie
ncy,a
ndwill desig
n i
n later pays atte
ntio
n to the improveme
nt. Keywords: The craft,theworki
ng procedure,the cutti
ng specificatio
ns,clamp,the localizatio
n,the error 目录 摘要1 ABSTRCT 2 序言4 1.零件的工艺性分析5 1.1拨叉的用途5 1.2拨叉的技术要求5 1.3审查拨叉的工艺性6 1.4零件的工艺分析6 2.确定毛坯、绘制毛坯简图7 2.1选择毛坯7 2.2确定毛坯尺寸公差和机械加工余量7 2.3绘制铸件毛坯简图8 3拟定拨叉工艺路线9 3.1定位基准的选择9 3.1.1粗基准的选择9 3.1.2精基准的选择10 3.2表面加工方法的选择10 3.3工序集中与分散10 3.4工序顺序的安排10 3.5确定工艺路线11 3.5.1机械加工余量、工序尺寸确定：11 3.5.2确定切削用量及基本工时12 4.夹具设计20 4.1问题的提出20 4.2夹具设计20 总结21 致谢22 参考文献23