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。 汽车后桥壳体及其精镗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：汽车后桥壳体;镗孔;夹具设计;工艺;工序;切削用量 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 coordi
natio
n a
nd measureme
nt a
nd so o
n. The fixture desig
n of automobile rear axle housi
ng a
nd its precisio
n bori
ng hole is three parts, i
ncludi
ng the process desig
n, the process desig
n a
nd the special fixture desig
n. I
n the process desig
n, the parts are a
nalyzed first, the process of the parts is redesig
ned a
nd the structure of the bla
nk is redesig
ned. The process datum of the parts is selected a
nd the process route of the part is desig
ned. The
n the size calculatio
n of theworki
ng procedure of the parts is calculated, the key is to determi
ne the process equipme
nt a
nd the cutti
ng amou
nt of thevariousworki
ng order; the
n, the key is to determi
ne the amou
nt of the process equipme
nt a
nd the cutti
ng amou
nt. The desig
n of the special fixture is carried out, a
nd the compo
ne
nts of the fixture are desig
ned, such as the positio
ni
ng eleme
nt, the clampi
ng eleme
nt, the guidi
ng eleme
nt, the co
n
necti
ng partswith the machi
ne tool a
nd the other parts. The positio
ni
ng error is calculatedwhe
n the fixture is positio
ned, a
nd the ratio
nality a
nd i
nadequacies of the fixture structure are a
nalyzed, a
nd the desig
n is i
njected i
n the future. It is i
nte
nded to be improved. Keywords: automobile rear axle housi
ng; bori
ng; fixture desig
n; tech
nology; process; cutti
ng parameter 目录 摘要I Abstract II 1绪论1 2零件的分析2 2.1零件的作用2 2.2零件的工艺分析2 3工艺规程设计3 3.1确定毛坯的制造形式3 3.2基面的选择3 3.3制定工艺路线4 3.4确定各工序的加工余量5 3.5确定切削用量及基本工时8 4镗床夹具设计32 4.1问题提出32 4.2定位基准的选择32 4.3定位元件的设计32 4.4定位误差分析32 4.5切削力的计算与夹紧力分析33 4.6夹具设计及操作简要说明33 结束语34 谢辞35 参考文献36