机械5

摘要 论述拨叉零件的工艺规程及铣削下边的半圆夹具设计，研究零件机械加工工艺规程的设计问题，介绍工艺规程的组成、制定路线等。说明零件的机械加工工艺结构性，结合生产主要从零件分析、毛坯的选择、工艺路线的拟定、工序内容的确定等几个方面详细的讲述了拨叉零件工艺过程设计以及工艺编制中应注意的问题，以及如何才能达到最理想的表面质量和经济效益。 针对设计给定的题目，设计铣削R24和R30半圆专用铣床夹具。夹具设计包括：设计出对零件进行定位，夹紧，还有引导的各个元件。在这里尤其要注意的是，夹具在定位零部件的时候，会产生误差，这个误差要在的合理控制范围以内，要充分了解夹具的优缺点，以便改进。 关键词：拨叉、半圆、铣床夹具、加工工艺、工艺路线 ABSTRACT This paper discusses the process pla
n
ni
ng of the fork parts a
nd the desig
n of the semicircle fixture for milli
ng the lower edge,studies the desig
n of the machi
ni
ng process pla
n
ni
ng of the parts,a
nd i
ntroduces the compositio
n a
nd route of the process pla
n
ni
ng.This paper explai
ns the structure of the machi
ni
ng process of the partsbi
nedwith the productio
n,it mai
nlydescribes the process desig
n of the fork parts a
nd the problems that should be paid atte
ntio
n to i
n the process compilatio
n from the parts a
nalysis,the selectio
n of the bla
nk,the formulatio
n of the process route a
nd the determi
natio
n of the process co
nte
nt,a
nd howto achieve the most ideal surface qualitya
nd eco
nomic be
nefits. Accordi
ng to the give
n problem,the special fixture for milli
ng R24 a
nd R30 semicircle is desig
ned.Fixture desig
n i
ncludes: Desig
n of parts positio
ni
ng,clampi
ng,a
nd guide thevarious compo
ne
nts.I
n particular,we should payatte
ntio
n to thatwhe
n the fixture locates the parts,therewill be errors,which should bewithi
n the reaso
nable co
ntrol ra
nge of the fixture.We should fullyu
ndersta
nd the adva
ntages a
nd disadva
ntages of the fixture,so as to improve it. Keywords: fork,semicircle,milli
ng fixture,processi
ng tech
nology,process route 目录 摘要I ABSTRACT II 1引言1 2零件分析及毛坯的选择2 2.1零件的作用2 2.2零件分析2 2.2.1组成表面2 2.2.2技术要求3 2.2.3形位公差3 2.3毛坯的选择3 2.3.1选择毛坯的原则3 2.3.2零件毛坯的选择及制造方法4 2.3.3毛坯的热处理4 3拟定工艺路线5 3.1定位基准的选择5 3.1.1粗基准的选择5 3.1.2精基准的选择5 3.2加工工艺路线的拟定6 3.3加工方法的拟定7 4加工余量、切削用量及切削时间的确定9 4.1加工余量的确定9 4.2切削用量及切削时间的确定10 5铣床专用夹具设计19 5.1确定定位方案、定位元件19 5.1.1确定定位方案19 5.1.2确定定位元件19 5.2确定夹紧方案、夹紧元件20 5.2.1确定夹紧方案20 5.2.2确定夹紧元件20 5.3确定夹具体20 5.4确定导向装置21 5.5铣削力计算21 5.6定位误差分析22 5.7加工精度误差分析22 结论24 致谢25 参考文献26