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。 哑铃销的加工工艺规程和车环形槽的工艺设计、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：切削用量夹紧定位误差。 Abstract The desig
n i
nvolves the mecha
nical ma
nufacturi
ng process a
nd machi
ne tool fixture desig
n, metal cutti
ng machi
ne tools, tolera
nce a
nd measureme
nt, a
nd other aspects of k
nowledge. The three parts are the processi
ng tech
nology of dumbbell pi
ns, the process desig
n, the process desig
n a
nd the desig
n of special fixture. 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: cutti
ng amou
nt clampi
ng positio
ni
ng error. 目录 摘要I 前言1 第1章零件的分析2 1.1零件的作用2 1.2零件的结构工艺分析2 1.3关键表面的技术要求分析3 第2章工艺设计4 2.1确定生产类型4 2.1.1生产纲领4 2.1.2生产效率分析4 2.1.3生产类型4 2.2毛坯选择与毛坯图说明5 2.2.1毛坯选择5 2.2.2毛坯图说明6 2.3工艺路线的确定6 2.3.1粗、精基准的选择6 2.3.2选择加工方法7 2.3.3划分加工阶段7 2.3.4工序前后顺序的安排8 2.3.5选择的加工设备及工装9 2.3.6制订工艺路线10 2.3.7确定加工余量和切削用量以及时间定额11 第3章夹具定位夹紧方案分析与论证30 3.1定位机构30 3.2夹紧机构30 3.2.1选择夹紧机构30 3.2.2切削力及夹紧力的大小30 3.3误差分析31 3.4定位误差的计算32 第4章夹具总体结构分析及夹具的使用说明33 4.1夹具体总体结构分析33 4.2夹具的使用说明33 设计小结34 参考文献35