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。 本次设计的题目是刹车支架工艺工装设计，根据老师给的图纸要求进行加工工艺规程设计和夹具设计，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：夹紧机构；刹车支架；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 size cha
nges of parts, more a
nd more fixtures have bee
n elimi
nated. Therefore, it is
necessary to desig
n special fixtures. Whe
n the special fixture is desig
ned, the positio
ni
ng scheme of theworkpiece should be co
nsidered, the clampi
ng scheme of theworkpiece a
nd the desig
n a
nd clampi
ng mecha
nism, the other compo
ne
nts of the fixture, the structural form of the fixture a
nd so o
n. The title of this desig
n is the desig
n of the brake support process tooli
ng. Accordi
ng to the requireme
nts of the teacher's drawi
ngs, the process pla
n
ni
ng a
nd fixture desig
n are required. O
n the basis of masteri
ng the role of the parts, the process of the parts is a
nalyzed. 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 literature about machi
ne tool jig at home a
nd abroad. At the same time, I a
nalyzed the structure a
nd tech
nology of the parts at the same time of u
ndersta
ndi
ng the part drawi
ngs, made clear the choice of the rough datum a
nd the fi
ne datum, determi
ned the machi
ni
ng allowa
nce a
nd the size of the bla
nk, thus determi
ned the process of the additio
n of the parts, a
nd calculated the cutti
ng of each process. The amou
nt a
nd time ofwork. Fi
nally, the fixture required for this desig
n is completed. Keywords: clampi
ng mecha
nism; brake bracket; processi
ng tech
nology; fixture desig
n; cutti
ng parameters 目录 摘要I Abstract II 1绪论1 1.1机床夹具的分类1 1.2机床夹具的发展趋势2 1.3夹具设计的基本要求2 2工艺规程的设计4 2.1确定毛坯的的制造形式4 2.2基准的选择5 2.3制订工艺路线5 2.4机械加工余量、工序尺寸及毛坯尺寸的确定7 2.5确定切削用量及基本工时8 3钻、扩、铰Ф14H9和Ф16H9孔专用夹具的设计17 3.1问题提出17 3.2定位基准的选择17 3.3定位元件的设计17 3.4切削力和夹紧力的计算17 3.5夹具设计及简要操作说明17 总结19 致谢20 参考文献21