机械5

滑动叉的工艺规程及钻Ф39圆柱孔夹具设计 摘要 本设计主要内容包括滑动叉的工艺规程设计以及钻Ф39圆柱孔专用钻床夹具设计。在设计过程中完成了零件图、毛坯图、夹具体装配图和夹具体零件图的绘制及说明书的编写。 滑动叉零件结构不复杂，而且为铸件，滑动叉是汽车后桥上的一个重要的零件，它具有传递扭矩、调整传动轴的长短及位置，从而使汽车在前进中获得动力，并使零件之间达到更好的配合。Ф39圆柱孔有较高精度要求，铸造即可满足，与其它接触面处的端面精度要求较高，需要经过钻孔、扩孔和铰孔加工，保证尺寸公差及形位公差。 本次设计针对Ф39圆柱孔的加工精度设计了一套专用夹具，采用定位座、V型块以及工件插销来满足定位要求，又通过夹紧装置保证加工过程中不会产生较大误差。其中间过程对夹紧装置进行了受力分析，保证了夹紧的可靠性。 关键词：滑动叉、工艺规程，Ф39圆柱孔、钻床 Abstract The mai
n co
nte
nts of this desig
n i
nclude the desig
n of tech
nological procedures for slidi
ng fork a
nd the desig
n of special drilli
ng jig for drilli
ng_39 cyli
ndrical hole. I
n the desig
n process, the drawi
ng of part drawi
ng, bla
nk drawi
ng, fixture body assembly drawi
ng a
nd fixture body parts drawi
ng a
nd the compilatio
n of i
nstructio
ns are completed. Slidi
ng fork is a
n importa
nt part of automobile rear axle. It ca
n tra
nsfer torque, adjust the le
ngth a
nd positio
n of drive shaft, so that the automobile ca
n get power i
n adva
nce a
nd make the parts fit better. _39 cyli
ndrical hole has a higher precisio
n requireme
nts, casti
ng ca
n be satisfied, a
nd other co
ntact surface with a higher e
nd accuracy requireme
nts,
need to be drilled, reami
ng a
nd reami
ng processi
ng, to e
nsure dime
nsio
nal tolera
nce a
nd shape tolera
nce. I
n this desig
n, a set of special fixture is desig
ned for the machi
ni
ng accuracy of_39 cyli
ndrical hole. The fixture uses positio
ni
ng seat, V-shaped block a
nd workpiece pi
n to meet the positio
ni
ng requireme
nts, a
nd the clampi
ng device e
nsures that there is
no large error i
n the machi
ni
ng process. The clampi
ng force is a
nalyzed by the process, which e
nsures the reliability of clampi
ng. Key words slidi
ng fork, process regulatio
n, 39 cyli
ndrical hole, drilli
ng machi
ne 目录 摘要I Abstract II 第一章绪论1 第二章滑动叉零件的分析3 2.1零件的作用3 2.2零件的分析3 2.2.1零件的工艺分析3 2.2.2零件结构分析4 2.2.3零件的技术要求分析4 2.2.4零件的组成表面4 2.2.5零件的技术要求5 2.2.6零件的形位公差5 第三章滑动叉工艺规程的设计6 3.1零件生产类型的确定6 3.2确定零件的材料及制造方式6 3.3选择加工的定位基准7 3.4加工工艺路线的选择、比较与确定7 3.4.1加工工艺路线方案一8 3.4.2加工工艺路线方案二8 3.4.3加工工艺路线的比较与确定8 3.5加工设备、加工刀具及量具的选用9 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 第四章专用夹具设计22 4.1确定和选择定位方案及定位元件22 4.2确定和选择夹紧方案及元件23 4.3设计夹具体24 4.4选择导向装置25 4.5计算钻削力25 4.6计算夹紧力26 4.7分析定位误差26 结论28 致谢29 参考文献30