机械5

空气压缩机气缸体加工工艺及钻Φ20孔Φ26孔夹具设计 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。 本次设计的题目是空气压缩机气缸体加工工艺及钻Φ20孔Φ26孔专用夹具设计，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：空气压缩机气缸体，加工工艺，钻Φ20孔Φ26孔，夹具设计 ABSTRACT Fixture is a clampi
ng device for parts processi
ng, a
nd is a
necessary device for machi
ni
ng parts. The utility rate of the fixture is high, the eco
nomy is good, a
nd the use a
nd qua
ntity of the fu
nctio
nal compo
ne
nts are few. As the size of the parts cha
nges, more a
nd more clamps are elimi
nated. Therefore, it is
necessary to desig
n a set of special fixtures. Whe
n desig
ni
ng special fixture,we should co
nsider the locatio
n pla
n ofworkpiece, clampi
ng scheme a
nd clampi
ng mecha
nism, other parts of fixture, fixture structure a
nd so o
n. The topic of this desig
n is the processi
ng tech
nology of air compressor cyli
nder block a
nd the desig
n of special drilli
ng fixture for 20 holes a
nd 26 holes. Accordi
ng to the requireme
nts of the drawi
ngs, the process desig
n a
nd fixture desig
n are carried out, a
nd the process of parts is a
nalyzed based o
n the role of parts. I
n order to desig
n a give
n topic, the desig
n of the fixture is mai
nly desig
ned i
n the desig
n. The clamp is desig
ned to e
nsure the processi
ng precisio
n, productio
n efficie
ncy a
nd easy operatio
n for theworkers. At the begi
n
ni
ng of desig
n I refer to the releva
nt data a
nd literature at home a
nd abroad o
n the fixture, structure a
nd process of parts i
n the read parts map at the same time a
nalysis, clear coarse a
nd fi
ne refere
nce base selectio
n, determi
ne the machi
ni
ng allowa
nce a
nd the size of the bla
nk, so as to determi
ne the parts processi
ng process, calculatio
n of the process of cutti
ng dosage a
nd time. Fi
nally, the fixture required for this desig
n is completed. Keywords: air compressor cyli
nder body, processi
ng tech
nology, drilli
ng 20 holes a
nd 26 holes, jig desig
n 目录 ABSTRACT II 第1章绪论4 第2章加工工艺规程设计6 2.1零件的分析6 2.1.1零件的作用6 2.1.2零件的工艺分析7 2.2空气压缩机气缸体加工的主要问题和工艺过程设计所应采取的相应措施7 2.2.1孔和平面的加工顺序7 2.2.2孔系加工方案选择7 2.3空气压缩机气缸体加工定位基准的选择8 2.3.1粗基准的选择8 2.3.2精基准的选择8 2.4空气压缩机气缸体加工主要工序安排9 2.5机械加工余量、工序尺寸及毛坯尺寸的确定12 2.6确定切削用量及基本工时（机动时间）[3] 12 第3章钻Φ20孔Φ26孔专用夹具设计22 3.2夹具设计22 3.2.1定位基准的选择22 3.2.2切削力及夹紧力的计算22 3.3定位误差的分析25 3.4夹具设计及操作的简要说明26 结论27 参考文献28