机械5

中文提要 本次设计是对后钢板弹簧吊耳零件的加工工艺规程及一些工序的专用夹具设计。后钢板弹簧吊零件的主要加工表面是平面及孔。由加工工艺原则可知，保证平面的加工精度要比保证孔的加工精度容易。所以本设计遵循先面后孔的原则。并将孔与平面的加工明确划分成粗加工和精加工阶段以保证加工精度。基准选择以后钢板弹簧吊耳大外圆端面作为粗基准，以后钢板弹簧吊耳大外圆端面与两个工艺孔作为精基准。主要加工工序安排是先以后钢板弹簧吊耳大外圆端面互为基准加工出端面，再以端面定位加工出工艺孔。在后续工序中除个别工序外均用端面和工艺孔定位加工其他孔与平面。整个加工过程均选用组合机床。 ABSTRACT The desig
n of the plate after spri
ng lug parts of the processi
ng order of the processes a
nd some special fixture desig
n. Spri
ng plate after ha
ngi
ng parts of the mai
n pla
ne of the surface a
nd pore. By the pri
nciple k
now
n Processi
ng, the pla
ne guara
ntee precisio
n machi
ni
ng holes tha
n guara
ntee the machi
ni
ng precisio
n easy. So the desig
n follows the surface after the first hole pri
nciple. Pla
newith holes a
nd the processi
ng clearly divided i
nto roughi
ng a
nd fi
nishi
ng stages of processi
ng to e
nsure accuracy. After selecti
ng base plate spri
ng lug large cyli
ndrical face as a rough be
nchmark, After the leaf spri
ng lug large cyli
ndrical e
ndwith two holes as a precisio
n tech
nology be
nchmarks. mai
n processes arra
ngeme
nts after the first spri
ng plate lug large cyli
ndrical face each other be
nchmarks machi
ned face, E
nd positio
n to further processi
ng out of holes. I
n additio
n to the follow-up processes are i
ndividual processeswith e
nd-positio
ni
ng tech
nology a
nd other processi
ng Ko
ng a
nd pla
ne. The e
ntire process of processi
ng machi
ne combi
natio
nswere selected. 目录 中文提要1 ABSTRACT II 1绪论1 2后钢板弹簧吊耳加工工艺规程设计3 2.1零件的分析3 2.1.1零件的作用3 1.1.2零件的工艺分析3 2.2工艺过程设计所应采取的相应措施4 2.3后钢板弹簧吊耳加工定位基准的选择4 2.3.1确定毛坯的制造形式4 2.3.2粗基准的选择4 2.3.3精基准的选择5 2.4工艺路线的制定5 2.4.1工艺方案一6 2.4.2工艺方案二6 2.4.3工艺方案的比较与分析6 2.5机械加工余量、工序尺寸及毛坯尺寸的确定7 2.6确定切削用量及基本工时（机动时间） 9 2.7时间定额计算及生产安排19 2.8本章小结22 3加工工艺孔夹具设计23 3.1加工工艺孔夹具设计23 3.2定位方案的分析和定位基准的选择23 3.3定位元件的设计24 3.4定位误差分析25 3.5切削力的计算与夹紧力分析25 3.6钻套、衬套、钻模板及夹具体设计26 3.7夹具精度分析28 3.8夹具设计及操作的简要说明28 3.9本章小结28 结论30 参考文献31