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。 设计选取支架零件为被加工件，设计中包含了加工工艺规程制定、工序设计以及钻φ22孔专用夹具设计三部分。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：支架；加工工艺；工序；钻φ22孔；专用夹具；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 bracket parts are selected as the processed parts. The desig
n i
ncludes three parts: the formulatio
n of processi
ng procedures, the desig
n of process a
nd the desig
n of special fixture for drilli
ng 22 holes. 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: Bracket; Processi
ng tech
nology; Procedure; Drilli
ng 22 holes; Special fixture; Cutti
ng parameters 目录 摘要I Abstract II 第1章前言1 1.1课题背景1 1.2目的1 1.3选题的依据及意义1 1.4夹具的发展趋势2 第2章零件的分析3 2.1零件的作用3 2.2零件的分析4 第3章工艺规程设计5 3.1确定毛坯的制造形式5 3.2基面的选择5 3.3制订工艺路线6 3.4加工设备及工艺装备的选择8 3.5各工序的加工余量9 3.6确定切削用量及基本工时10 第4章夹具设计21 4.1问题提出21 4.2定位机构21 4.3夹紧机构23 4.4机床夹具的总体形式24 总结26 参考文献27