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。 偏心轴加工工艺规程及镗床镗定心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。 ABSTRCT This desig
n i
nvolves the mecha
nical ma
nufacturi
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nd fixture desig
n, metal cutti
ng machi
ne, tolera
nce a
nd measureme
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nd other aspects of k
nowledge. The ecce
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nd bori
ng a
nd ce
nteri
ng fixture desig
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ncludi
ng machi
ni
ngprocess desig
n process desig
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nd fixture three. I
n the process of desig
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ndersta
nd the a
nalysis of parts, parts of the process to desig
n a bla
nk structure, a
nd choose the good compo
ne
nts the processi
ng datum, desig
ns the process routes of the parts; the
n the parts of each labor step process size calculatio
n, is the key to decide the craft equipme
nt a
nd the cutti
ng process of thevarious desig
n parameters; the
n a special fixture, the fixture selectio
n for thevarious compo
ne
nts of the desig
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n
necti
ng parts positio
ni
ng eleme
nts a
nd clampi
ng eleme
nts, guide eleme
nt, fixture a
nd machi
ne tool a
nd other compo
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nts; positio
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ng error is calculatedwhe
n the fixture, a
nalysis the ratio
nality a
nd shortcomi
ng of fixture structure, improve a
nd desig
n i
n later. Keywords: Process, process, cutti
ng, clampi
ng, positio
ni
ng, error. 目录 摘要I ABSTRCT II 序言1 一零件的分析2 1.1零件的作用2 1.2零件的工艺分析3 1.2.1尺寸精度3 1.2.2表面粗糙度的要求3 1.2.3形位公差要求3 1.2.4其他技术要求4 二.工艺规程设计5 2.1确定毛坯的制造形式5 2.2基面的选择5 2.2.1粗基准选择5 2.2.2精基准的选择6 2.3加工方法的选择8 2.4加工顺序的安排8 2.5制定工艺路线9 2.6机械加工余量、工序尺寸及毛坯尺寸的确定12 2.7确定切削用量及基本工时12 2.7.1铣端面，钻中心孔12 2.7.2粗车1 14 2.7.3粗车2 15 2.7.4粗车3 16 2.7.5修中心孔18 2.7.6精车1 19 2.7.7精车2 21 2.7.8精车3 23 2.7.9铣槽24 三夹具设计27 3.1问题的提出27 3.2定位基准的选择27 3.3切削力和夹紧力的计算27 3.5夹具设计及操作的简要说明30 总结31 致谢33 参考文献34