机械5

小支架三维造型与直径Φ20H9孔的钻夹具设计 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。 本次设计的题目是小支架三维造型与Φ20H9孔的钻夹具设计。设计的内容包括零件加工的工艺三卡、零件三维造型以及专用夹具的设计三部分。在工艺三卡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：小支架、三维造型、Φ20H9孔、钻夹具设计 ABSTRACT The desig
n of awide ra
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nowledge co
ncer
ni
ng the mecha
nical ma
nufacturi
ng processes a
nd desig
n of jigs a
nd fixtures, metal-cutti
ng machi
ne tools, tolera
nce a
nd measureme
nt. The subject is a small bracket desig
n three-dime
nsio
nal modeli
ng a
ndΦ20H9 hole drilli
ng fixture desig
n. Desig
n i
ncludes parts of three-card processi
ng tech
nology, three-dime
nsio
nal modeli
ng of parts a
nd special fixture desig
n three parts. I
n the process of three-card desig
n should first partswere a
nalyzed to u
ndersta
nd the part of process re-desig
n a rough structure, a
nd select the machi
ni
ng datum good parts, desig
n process li
ne compo
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nts; the
n the part of each step of the process of the dime
nsio
nal calculatio
n the key is to determi
ne the tech
nical equipme
nt a
nd cutti
ng each step; the
n dedicated fixture desig
n, select the desig
n of thevarious compo
ne
nts of fixtures, such as the positio
ni
ng eleme
nt, the clampi
ng eleme
nt, the guide eleme
nt, clamp a
nd machi
ne tools a
nd other co
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necti
ng member member; calculated positio
ni
ng errors ge
neratedwhe
n the jig positio
ni
ng, a
nalyze the ratio
nality a
nd shortcomi
ngs fixture structure a
nd atte
ntio
n to improvi
ng the desig
n of the future. Keywords: Small frame, three-dime
nsio
nal modeli
ng,Φ20H9 hole drilli
ng fixture desig
n 目录 摘要I ABSTRACT II 第1章绪论3 1.1机床夹具的概述3 1.2机床夹具的研究现状3 1.3机床夹具的发展趋势3 1.4课题设计工作任务的安排5 第2章零件的分析6 2.1零件的作用6 2.2零件的工艺分析6 2.2.1零件的组成表面6 2.2.2零件的技术要求6 第3章零件工艺规程的设计7 3.1确定零件生产类型7 3.2确定零件的材料及制造方式7 3.3选择加工的定位基准8 3.4加工工艺路线的制定9 3.5机械加工设备及刀具的选择10 3.6各工序工步加工余量的计算10 3.7确定切削用量及基本工时11 第4章专用夹具设计20 4.1定位方案及定位元件的确定与选择20 4.2夹紧方案及装置的确定与选择21 4.3夹具体的确定22 4.4导向装置的确定23 4.5钻削力的计算23 结论25 致谢26 参考文献27