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。 直齿圆柱齿轮的工艺设计和加工直齿圆柱齿轮的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：直齿圆柱齿轮；工艺；夹具设计；工序；工艺路线；切削用量 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 tech
nological desig
n of spur gear a
nd the fixture desig
n of processi
ng spur gear are three parts, i
ncludi
ng the tech
nological 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, 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 the fixture body a
nd the machi
ne tool, a
nd other compo
ne
nts. The positio
ni
ng errors caused by fixture positio
ni
ng are calculated, a
nd the ratio
nality a
nd shortcomi
ngs of fixture structure are a
nalyzed. Improveme
nt. Keywords: spur gear; process; fixture desig
n; process; process route; cutti
ng parameters 目录 摘要I Abstract II 第1章绪论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9 2.1零件的作用9 2.2零件的工艺要求9 第3章机械加工工艺路线10 3.1确定毛坯的制造形式10 3.2基面的选择10 3.3加工工艺路线12 3.4机械加工余量的确定13 3.5确定切削用量及基本工时13 第4章专用夹具设计32 4.1问题的提出32 4.2定位基准的选择32 4.3定位元件的设计33 4.3定位误差分析33 4.4切削力的计算与夹紧力分析34 4.5夹具设计及操作简要说明35 参考文献35 心得体会37