机械5

摘要 夹具是零件加工的夹紧装置，是加工零件的一种必不可少的装置。夹具利用率高，经济性好，对功能组件的使用和数量少。随着零件的尺寸变化，越来越多的夹具被淘汰了，因此，设计一套专用夹具是十分有必要的。在设计专用夹具时要考虑工件的定位方案，工件的夹紧方案和设计夹紧机构，夹具的其他组成部分，夹具的结构形式等。 本次设计的题目是CA6140普通车床床尾顶尖套盖机械加工工艺规程及夹具设计，根据老师给的图纸要求进行工艺设计和夹具设计，在掌握零件作用的基础上，对零件的工艺进行分析。针对设计给定的题目，设计里面主要对机床夹具进行设计。本夹具体是以保证加工精度，生产效率和便于工人操作为宗旨展开的设计。 设计之初我查阅相关数据及国内外关于机床夹具的文献，在看懂零件图的同时对零件的结构和工艺进行分析，明确粗基准和精基准的选择，确定零件的加工余量与毛坯的尺寸、从而确定零件的加工工艺过程、计算各工序的切削用量及工时。最终完成了本次设计所需的夹具。 关键词：床尾顶尖套盖；加工工艺；夹具设计；切削用量 Abstract Jig is the clampi
ng device for parts processi
ng,which is a
n esse
ntial device for processi
ng parts. The fixture has the adva
ntages of high utilizatio
n rate, good eco
nomy, a
nd less use a
nd qua
ntity of fu
nctio
nal compo
ne
nts. With the cha
nge of the size of parts, more a
nd more fixtures are elimi
nated. Therefore, it is
necessary to desig
n a set of special fixtures. Whe
n desig
ni
ng the special fixture,we should co
nsider the positio
ni
ng scheme of theworkpiece, the clampi
ng scheme of theworkpiece a
nd the desig
n of the clampi
ng mecha
nism, other parts of the fixture, the structure of the fixture a
nd so o
n. The topic of this desig
n is CA6140 ordi
nary lathe tail top cover machi
ni
ng process rules a
nd fixture desig
n, accordi
ng to the teacher's drawi
ng requireme
nts for process desig
n a
nd fixture desig
n, o
n the basis of graspi
ng the role of parts, parts of the process a
nalysis. For the desig
n of a give
n topic, the desig
n mai
nly focuses o
n the desig
n of machi
ne tool jig. The clip is specifically desig
ned to e
nsure machi
ni
ng accuracy, productio
n efficie
ncy a
nd ease ofworker operatio
n. At the begi
n
ni
ng of the desig
n, I co
nsulted the releva
nt data a
nd the domestic a
nd foreig
n literature about the machi
ne tool fixture, a
nalyzed the structure a
nd process of the partwhile readi
ng the part drawi
ng, made clear the choice of the rough datum a
nd the precisio
n datum, determi
ned the machi
ni
ng allowa
nce of the part a
nd the size of the bla
nk, thus determi
ned the processi
ng process of the part a
nd calculated the cutti
ng process of eachworki
ng procedure. Dosage a
ndworki
ng hours. Fi
nally, the fixture
needed for the desig
n is completed. Keywords: top cover of bed e
nd; processi
ng tech
nology; fixture desig
n; cutti
ng parameter 目录 摘要1 Abstract 2 第1章零件分析和毛坯设计4 1.1零件工艺分析及生产类型确定4 1.2毛坯类型及毛坯图设计5 第2章机械加工工艺规程设计7 2.1基准选择7 2.2工艺方案拟定7 2.3机械加工余量、工序尺寸及公差的确定8 2.4主要工序切削用量及时间定额的计算10 第3章专用夹具设计24 3.1工序内容及加工要求24 3.2定位基准24 3.3夹具结构设计及工作流程24 3.4设计定位方案应满足的要求24 3.5定位方案的确定24 3.6定位元件的确定25 3.7夹紧方案的确定25 3.8夹紧元件的确定25 3.9夹具体的设计26 3.10导向装置27 3.11计算切削力27 3.12计算夹紧力27 3.13定位误差28 第4章结论29 参考文献30