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。 总泵缸体工艺规程及其钻、攻M121.25-5H螺纹的工装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：工艺、工序、切削用量、夹紧、定位、误差。 Abstract This desig
n i
nvolves ma
ny aspects of k
nowledge, such as mecha
nical ma
nufacturi
ng process, machi
ne tool fixture desig
n, metal cutti
ng machi
ne tool, tolera
nce matchi
ng a
nd measureme
nt. Master cyli
nder block process specificatio
n a
nd drilli
ng a
nd tappi
ng M12x1 The fixture desig
n of 25-5h thread i
ncludes three parts: process desig
n, process desig
n a
nd special fixture desig
n. 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, select the machi
ni
ng be
nchmark of the parts, a
nd desig
n the process route of the parts; The
n, the size of each step of the part is calculated. The key is to determi
ne the process equipme
nt a
nd cutti
ng parameters of each process; The
n the special fixture is desig
ned, a
nd each compo
ne
nt of the fixture is selected a
nd desig
ned, such as positio
ni
ng eleme
nt, clampi
ng eleme
nt, guidi
ng eleme
nt, co
n
necti
ng part betwee
n clamp a
nd machi
ne tool a
nd other parts; Calculate the positio
ni
ng error caused by fixture positio
ni
ng, a
nalyze the ratio
nality a
nd shortcomi
ngs of fixture structure, a
nd pay atte
ntio
n to improveme
nt i
n future desig
n. Key words: process, process, cutti
ng parameters, clampi
ng, positio
ni
ng, error. 目录 摘要I Abstract 2 第一章绪论2 1．1引言2 1．2机械加工工艺规程的作用2 1．3研究方法及技术路线3 1．4课题背景及发展趋势4 第2章工艺规程设计5 2．1毛坯的制造形式5 2. 2零件分析5 2．3基面的选择5 2.3.1粗基准的选择原则5 2．3．2精基准选择的原则6 2．4制定工艺路线6 2．6确定切削用量及基本工时8 第3章钻、攻M121.25-5H螺纹的夹具设计22 3.1：问题的提出22 3.2：定位基准的选择22 3.3切削力及夹紧力计算22 3.4定位误差分析22 3.5钻套的设计23 3.6夹具截图25 总结27 致谢28 参考文献29