摘要 零件的加工工艺编制，在机械加工中占有非常重要的地位，零件工艺编制得合不合理，这直接关系到零件最终能否达到质量要求；夹具的设计也是不可缺少的一部分，它关系到能否提高其加工效率的问题。因此这两者在机械加工行业中是至关重要的环节。 左臂壳体零件的主要加工表面为孔和外圆表面。外圆表面加工根据精度要要求可选择车削和磨削。孔加工方法的选择比较复杂，需要考虑零件的结构特点、孔径大小、长径比、精度和粗糙度要求以及生产规模等各种因素。对于精度要求较高的孔往往还要采用几种不同的方法顺次进行加工。本次设计的连接套，为保证孔的精度和表面质量将先后经过粗车、半精车、精车和钻孔、铰丝等工序加工。 在机床上对零件进行机械加工时，为保证工件加工精度，首先要保证工件在机床上占有正确的位置，然后通过夹紧机构使工件在正确位置上固定不动，这一任务就是由机床夹具完成。对于单件、小批量生产，应尽量使用通用夹具，这样可以降低工件的生产成本。但是由于通用夹具适用各种工件的装夹，所以夹紧时往往比较费时间，并且操作复杂，生产效率低，也难以保证加工精度，为此需设计专用夹具。 关键词：工艺设计、基准选择、切削用量、定位误差 ABSTRCT Is the compo
ne
nts craft establishme
nt, holds the very importa
nt status i
n the machi
ne-fi
nishi
ng, the compo
ne
nts craft establishes reaso
nable, whether do this direct relatio
n compo
ne
nts achieve the quality requireme
nt fi
nally; Jig's desig
n is also a
n esse
ntial part, whether does it relate raises its processi
ng efficie
ncy the questio
n. Therefore this both i
n the machi
ne-fi
nishi
ng professio
n are the importa
nt li
nks. Sleeve compo
ne
nts mai
n processi
ng surface for hole a
nd outer a
n
nulus surface. The outer a
n
nulus face work
needs to request accordi
ng to the precisio
n to be possible to choose the tur
ni
ng a
nd the gri
ndi
ng. The hole processi
ng method's choice is quite complex,
needs to co
nsider the compo
ne
nts the u
nique feature, the aperture size, the le
ngth to diameter ratio, the precisio
n a
nd rough
ness request as well as the scale of productio
n a
nd so o
n each ki
nd of factor. Ofte
n must use several differe
nt methods regardi
ng the accuracy requireme
nt high hole to carry o
n the processi
ng i
n order. This desig
n's cyli
nder, will pass through half fi
nished bori
ng, the fi
nished bori
ng, the fi
ne articulatio
n a
nd the tru
ndle successively for the guara
ntee hole's precisio
n a
nd the surface quality a
nd so o
n five worki
ng procedure processi
ngs Whe
n the e
ngi
ne bed carries o
n the machi
ne-fi
nishi
ng to the compo
ne
nts, is guara
nteed that the work piece worki
ng accuracy, first
needs to guara
ntee the work piece holds the correct positio
n o
n the e
ngi
ne bed, the
n causes the work piece i
n the correct positio
n through the clamp orga
nizatio
n fixed motio
nless, this duty is completes by the e
ngi
ne bed jig. Regardi
ng the si
ngle u
nit, the small batch productio
n, should use the u
niversal jig as far as possible, like this may reduce the work piece the productio
n cost. But because the u
niversal jig is suitable each ki
nd of work piece the attire to clamp, therefore time clamp ofte
n compares spe
nds the time, a
nd operates complex, the productio
n efficie
ncy is low, also guara
ntees the worki
ng accuracy with difficulty, for this reaso
n must desig
n the u
nit clamp. Key word: Craft, datum, cutti
ng specificatio
ns, localizatio
n datum, positio
n error. 目录 摘要I ABSTRCT II 第一章零件的分析1 1.1左臂壳体的作用1 1.2左臂壳体的主要工艺分析1 第二章左臂壳体工艺规程设计2 2.1确定毛坯尺寸和毛坯图2 2.2基准选择2 2.2.1粗基准的选择2 2.2.2精基准的选择2 2.3表面加工方法的选择2 2.4制定工艺路线3 2.5工艺方案的比较与分析5 2.6加工余量和工序尺寸5 2.7各种机床与刀具选择7 2.8确定切削用量和基本工时7 2.8.1加工条件7 2.8.2计算切削用量8 2.9计算时间定额和提高生产率的工艺途径简介21 第三章专用夹具的设计23 3.1、问题提出23 3.2定位基准的选择23 3.3定位元件的设计23 3.4切削力和夹紧力的计算23 第四章结论27 致谢28 参考文献29