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。 机械式变速器中间齿轮轴的工艺规程设计和其粗车右端外圆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：切削用量，夹紧，定位，误差。 。 Abstract This desig
n i
nvolves the mecha
nical ma
nufacturi
ng process a
nd machi
ne tool fixture desig
n, metal cutti
ng machi
ne tools, tolera
nce a
nd measureme
nt ofvarious aspects of k
nowledge. The process pla
n
ni
ng desig
n of the i
ntermediate gear shaft of mecha
nical tra
nsmissio
n a
nd the fixture desig
n of the right outer circle of rough tur
ni
ng are composed of three parts: the process 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 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: cutti
ng amou
nt clampi
ng positio
ni
ng error. 目录 第1章绪论1 1.1引言1 1.2机械加工工艺规程的作用1 1.3研究方法及技术路线2 1.4课题背景及发展趋势3 第2章零件的分析4 2.1零件的作用4 2.2零件的工艺分析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拟订工艺路线6 3.4确定工艺路线7 3.4确定各工序的加工余量8 3.5确定切削用量及基本工时8 第4章车床夹具设计32 4.1问题提出32 4.2定位基准的选择32 4.3定位元件的设计32 4.4定位误差分析32 4.5切削力的计算与夹紧力分析34 4.6夹具设计及操作简要说明35 结束语36 谢辞37 参考文献38