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。 本套设计是基于CAD的条板工艺夹具设计，设计中包含了零件的工艺设计、工序设计、铣宽45槽专用夹具的设计及加工过程中的数控粗铣底面工序的自动编程及仿真四大部分。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：条板；工艺；工序；专用夹具；编程；切削用量，夹紧 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. This set of desig
n is based o
n the desig
n of strip process fixture of CAD. The desig
n i
ncludes four parts: the process desig
n of parts, the process desig
n, the desig
n of special fixture for milli
ng 45 slots, a
nd the automatic programmi
ng a
nd Simulatio
n of NC rough milli
ng bottom process i
n the process of processi
ng. 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, 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 desig
n the special fixture, select a
nd desig
n the fixture. Each compo
ne
nt, such as positio
ni
ng eleme
nt, clampi
ng eleme
nt, guidi
ng eleme
nt, fixture body a
nd machi
ne tool co
n
necti
ng parts a
nd other compo
ne
nts, calculates the positio
ni
ng error of fixture positio
ni
ng, a
nalyses the ratio
nality a
nd shortcomi
ngs of fixture structure, a
nd pays atte
ntio
n to improveme
nt i
n future desig
n. Keywords: strip; process; process; special fixture; programmi
ng; cutti
ng parameters, clampi
ng 目录 摘要I Abstract II 前言1 第1章概述发展2 1.1机床夹具的主要功能2 1.2机床夹具的组成2 1.3夹具设计的步骤和基本要求2 第2章零件的分析8 2.1零件的作用8 2.2零件的分析8 第3章工艺规程设计9 3.1确定毛坯的制造形式9 3.2基面的选择10 3.3选择加工方法11 3.3制定工艺路线11 3.4确定各表面的加工余量12 3.5确定切削用量及基本工时13 第4章夹具设计24 4.1定位基准的选择24 4.2切削力及夹紧力的计算24 4.3定位误差分析25 4.4夹具设计及操作的简要说明26 第五章加工程序编制及仿真加工27 5.1数控编程的分类27 5.2数控编程27 5.2.1创建几何体28 5.2.2创建刀具30 5.2.3面铣削加工设置31 5.3仿真加工及后处理32 谢辞34 参考文献35