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。 本次设计的题目是支架加工工艺规程制定及钻φ38孔专用夹具设计，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，设计中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：支架；加工工艺；钻φ38孔；专用夹具；夹具设计;切削用量 Abstract Fixture is a clampi
ng device for parts processi
ng, a
nd it is a
n i
ndispe
nsable device for parts processi
ng. 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 size cha
nge of parts, more a
nd more fixtures are elimi
nated, so it is
necessary to desig
n a set of special fixtures. I
n the desig
n of special fixture, the positio
ni
ng scheme ofworkpiece, the clampi
ng scheme ofworkpiece, the clampi
ng mecha
nism, other compo
ne
nts of fixture a
nd the structural form of fixture should be co
nsidered. The topic of this desig
n is the formulatio
n of tech
nological rules for bracket processi
ng a
nd the desig
n of special fixture for drilli
ng hole_38. O
n the basis of masteri
ng the role of parts, the process of parts is a
nalyzed. I
nview of the give
n desig
n topic, the desig
n mai
nly carries o
n the desig
n to the machi
ne tool fixture. This fixture body is desig
ned to e
nsure the processi
ng accuracy, productio
n efficie
ncy a
nd easy operatio
n forworkers. At the begi
n
ni
ng of the desig
n, I co
nsulted the releva
nt data a
nd the literature about machi
ne tool fixture at home a
nd abroad, a
nalyzed the structure a
nd process of the partswhile readi
ng the part drawi
ngs, made clear the selectio
n of rough a
nd precise refere
nce, determi
ned the processi
ng allowa
nce a
nd the size of the bla
nk, thus determi
ned the processi
ng process of the parts, a
nd calculated the cutti
ng parameters a
ndworki
ng hours of each process. Fi
nally, the fixture required for this desig
n has bee
n completed. Keywords: bracket; processi
ng tech
nology; drilli
ng hole_38; special fixture; fixture desig
n; cutti
ng parameters 目录 摘要I Abstract II 第1章概述发展1 1.1、机床夹具的主要功能1 1.2、机床夹具的组成1 1.3、夹具设计的步骤和基本要求1 第2章零件的分析4 2.1零件的作用4 2.2零件的工艺分析5 第3章工艺规程设计6 3.1毛坯的制造形式6 3.2基面的选择6 3.3工艺路线的确定7 3.4各个表面的加工余量9 3.5确定切削用量及基本工时11 第4章钻φ38孔专用夹具设计23 4.1问题的提出23 4.2定位基准的选择23 4.3定位元件的设计23 4.4切削力及夹紧力计算24 4.5定位误差分析24 4.6夹具设计及操作简要说明26 总结27 致谢28 参考文献29