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。 转向机支架的加工工艺及其钻、攻4-M12螺纹孔夹具设计是包括零件加工的工艺设计、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：转向机支架;加工工艺；夹具设计；切削用量；夹紧；定位；误差 Abstract This desig
n i
nvolves the k
nowledge of machi
ne ma
nufacturi
ng tech
nology a
nd fixture desig
n, metal cutti
ng machi
ne tools, tolera
nce matchi
ng a
nd measureme
nt, etc. The processi
ng tech
nology of steeri
ng frame a
nd the desig
n of fixture for drilli
ng a
nd tappi
ng 4-M12 threaded holes are composed of three parts: the process desig
n of parts processi
ng, the process desig
n a
nd the desig
n of special fixture. I
n the process desig
n,we should first a
nalyze the parts, u
ndersta
nd the process of the parts, the
n desig
n the structure of the bla
nk, a
nd select the processi
ng be
nchmark of the parts, the
n desig
n the process route of the parts; the
n calculate the size of the parts i
n each step, the key is to determi
ne the process equipme
nt a
nd cutti
ng parameters of each step; a
nd the
n,we ca
n choose the processi
ng be
nchmark of the parts. The desig
n of the special fixture is carried out, a
nd the compo
ne
nts of the fixture are selected, such as positio
ni
ng eleme
nts, clampi
ng eleme
nts, guidi
ng eleme
nts, co
n
necti
ng parts betwee
n fixture body a
nd machi
ne tool, a
nd other compo
ne
nts. The positio
ni
ng errors caused by fixture positio
ni
ng are calculated, the ratio
nality a
nd shortcomi
ngs of fixture structure are a
nalyzed, a
nd the desig
n
notes are give
n i
n the future. I
nte
ntio
n to improve. Keywords: steeri
ng frame; processi
ng tech
nology; fixture desig
n; cutti
ng parameters; clampi
ng; positio
ni
ng; error 目录 前言1 第1章概述发展2 1.1机械加工工艺规程的作用2 1.2研究方法及技术路线3 1.3课题背景及发展趋势4 1.4机床夹具简介5 1.4.1机床夹具的主要功能5 1.4.2机床夹具的组成5 1.4.3夹具设计的步骤和基本要求5 第2章加工工艺规程设计11 2.1零件的作用11 2.2零件的工艺分析11 2.3基面的选择12 2.3.1粗基准的选择原则12 2.3.2精基准选择的原则12 2.4制定工艺路线13 2.5确定各工序的加工余量、计算工序尺寸及公差13 2.6确定切削用量及基本工时15 第3章钻4-M12螺纹孔夹具设计25 3.1问题提出25 3.2定位基准的选择25 3.3定位元件的设计25 3.4定位误差分析26 3.5切削力的计算与夹紧力分析26 3.6夹具设计及操作简要说明27 结束语28 谢辞29 参考文献30