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。 基于CAD/CAM软件的油缸体零件工艺夹具设计是包括零件加工的工艺设计、工序设计、其钻、攻4×M5螺纹专用夹具的设计及选取加工过程中粗铣后端面工序做出数控编程及仿真四部分。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：工艺、工序、切削用量、夹紧、定位、误差、数控编程。 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 process fixture desig
n of cyli
nder block parts based o
n CAD/CAM software i
ncludes four parts: process desig
n of parts processi
ng, process desig
n, desig
n of special fixture for drilli
ng a
nd tappi
ng 4*M5 threads, a
nd NC programmi
ng a
nd Simulatio
n of e
nd face process after rough milli
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: process, process, cutti
ng parameters, clampi
ng, positio
ni
ng, error, NC programmi
ng. 目录 摘要I Abstract 2 第1章绪论5 1．1引言5 1．2机械加工工艺规程的作用5 1．3研究方法及技术路线6 1．4课题背景及发展趋势7 第2章工艺规程设计8 2.1毛坯的制造形式8 2. 2零件分析8 2.3基面的选择9 2.4制定工艺路线9 2.5确定各工序的加工余量12 2.6确定切削用量及基本工时12 第3章夹具设计36 3.1问题的提出36 3.2定位基准的选择36 3.3切削力及夹紧力计算36 3.4定位误差分析36 3.5夹具设计及操作简要说明37 第4章加工程序编制及仿真加工38 4.1数控编程的分类38 4.2数控编程38 4.2.1创建几何体39 4.2.2创建刀具41 4.2.3面铣削加工操作42 4.3仿真加工及后处理43 总结45