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。 十字头活塞零件的加工工艺设计、工序设计以及精车Φ85外圆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：十字头活塞；工艺；工序；专用夹具；切削用量 Abstract This desig
n i
nvolves the k
nowledge of machi
ne ma
nufacturi
ng process a
nd fixture desig
n, metal cutti
ng machi
ne tools, tolera
nce matchi
ng a
nd measureme
nt. There are three parts i
n the process desig
n,worki
ng procedure desig
n of crosshead pisto
n parts a
nd the desig
n of special fixture for fi
nishi
ng tur
ni
ngΦ 85 outer circle. I
n the process desig
n,we should 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, a
nd desig
n the process route of the parts; the
n calculate the size of each process step of the parts, the key is to determi
ne the process equipme
nt a
nd cutti
ng parameters of each process; the
n carry out the desig
n of the special fixture, a
nd select a
nd desig
n the fixture Each compo
ne
nt of the fixture, such as positio
ni
ng eleme
nt, clampi
ng eleme
nt, guidi
ng eleme
nt, co
n
necti
ng part betwee
n the fixture a
nd the machi
ne tool a
nd other parts; calculate the positio
ni
ng error ge
nerated duri
ng the fixture positio
ni
ng, a
nalyze the ratio
nality a
nd shortcomi
ngs of the fixture structure, a
nd pay atte
ntio
n to improveme
nt i
n the later desig
n. Keywords: crosshead pisto
n; process; process; special fixture; cutti
ng amou
nt 目录 摘要1 Abstract 2 1.零件图工艺性分析4 1.1零件结构功用分析： 4 1.2零件图纸分析： 4 1.3主要技术条件： 4 2.毛坯选择4 2.1毛坯类型4 2.2毛坯余量确定4 3．机械工艺路线确定5 3.1定位基准的选择： 5 3.2加工顺序的安排： 5 3.3加工阶段的划分说明6 3.4加工工序简图6 4.精车Φ85外圆夹具的设计14 4.1问题的提出： 14 4.2夹紧力计算： 14 设计体会16 参考文献17