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。 设计选取机床拨叉零件为被加工件，设计中包含了加工工艺规程制定、工序设计以及钻扩φ22孔夹具设计三部分。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：机床拨叉；加工工艺；工序；专用夹具；切削用量 Abstract This desig
n co
nte
nt i
nvolves the mecha
nical ma
nufacturi
ng process a
nd fixture desig
n, metal cutti
ng machi
ne, tolera
nce a
nd measureme
nt a
nd other aspects of k
nowledge. The desig
n selects the shift fork of the machi
ne tool as theworkpiece to be processed. The desig
n i
ncludes three parts: the formulatio
n of the processi
ng process, the process desig
n a
nd the desig
n of the fixture for drilli
ng a
nd expa
ndi
ng theφ 22 hole. 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, a
nd desig
n the process route of the parts; the
n calculate the size of eachworki
ng step of the part, the key is to determi
ne the process equipme
nt a
nd cutti
ng amou
nt of each process; the
n, desig
n the special fixture, select a
nd desig
n the fixture The positio
ni
ng error is calculated, the ratio
nality a
nd deficie
ncy of the fixture structure are a
nalyzed, a
nd the improveme
nt i
n the future desig
n is paid atte
ntio
n to. Keywords: machi
ne tool fork; processi
ng tech
nology; process; special fixture; cutti
ng parameters 目录 摘要I Abstract II 第1章零件的分析1 1.1零件的作用1 1.2零件的工艺分析1 第2章工艺规程设计2 2.1确定毛坯的制造形式2 2.2机械加工余量的确定2 2.3基面的选择2 2.4加工工艺路线4 2.5确定切削用量及基本工时5 第三章钻扩φ22孔夹具设计16 3.1问题提出16 3.2定位机构16 3.3夹紧机构18 3.4机床夹具的总体形式19 参考文献22 结束语23 心得体会24