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。 本次设计内容包含了左支座的工艺设计、工序设计以及钻φ25孔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：左支座；工艺；夹具设计；工艺路线；切削用量 Abstract The desig
n co
nte
nt i
nvolves the mecha
nical ma
nufacturi
ng process a
nd fixture desig
n,metal cutti
ng machi
ne,tolera
nce a
nd measureme
nt a
nd other aspects of k
nowledge. This desig
n i
ncludes three parts: the process desig
n of the left support,the process desig
n a
nd the desig
n of the special fixture for drilli
ngφ25 holes.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,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 step of the parts,the keyis to determi
ne the process equipme
nt a
nd cutti
ng parameters of each process; the
n desig
n the special fixture,a
nd select the fixture The compo
ne
nts 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 compo
ne
nts,are a
nalyzed,a
nd the positio
ni
ng error of the fixture is calculated,a
nd the ratio
nalitya
nd shortcomi
ngs of the fixture structure are a
nalyzed,a
nd the improveme
nt should be paid atte
ntio
n to i
n the future desig
n. Keywords: left support; process; fixture desig
n; process route; cutti
ng parameters 目录 摘要1 Abstract 2 第1章绪论6 2.1车床左支座的作用和工艺分析7 2.2零件毛坯的确定8 第3章车床左支座的加工工艺设计11 3.1工艺过程设计中应考虑的主要问题11 3.2基准的选择14 3.3机床左支座的工艺路线分析与制定15 3.4机械加工余量19 3.5确定切削用量及基本工时22 3.6时间定额计算36 第4章专用夹具设计42 4.1.定位方案42 4.2定位精度分析42 4.4夹紧力计算42 4.5.夹具的操作方法42 致谢44 参考文献45