机械5

汽车发动机曲轴的加工及夹具的设计 摘要 现代化的机械行业结构变化很大，对于加工单位来说设计工艺水平对他们的影响是非常关键的。夹具行业的发展是非常快的，里面设计的是汽车发动机曲轴的加工工艺及夹具的设计。 一开始阐述了零件，之后将毛坯的加工形式确定下来，将工艺路线定下来，还有将机械加工余量，切削余量等等都定下来。用绘图软件将零件图，还有毛坯图纸都画出来。本次专用夹具为：镗Φ62孔和锥孔镗床夹具。设计专用夹具的时候，将定位的方案，还有夹紧方案都定下来，确定下来定位零件，夹紧部件，确定导向装置等等，将切削力和夹紧力的数值算出来。将装配图还有非标零件图纸画出来的时候用的是AutoCAD软件。 关键词：汽车发动机、曲轴、加工工艺、专用夹具 ABSTRACT The structure of moder
n machi
nery i
ndustry has cha
nged greatly, a
nd the level of desig
n tech
nology isvery importa
nt for processi
ng u
nits. The developme
nt of fixture i
ndustry isvery fast. The processi
ng tech
nology a
nd fixture desig
n of automobile e
ngi
ne cra
nkshaft are desig
ned i
n this paper. At first, the parts are elaborated, the
n the processi
ng form of the bla
nk is determi
ned, the process route is determi
ned, a
nd the machi
ni
ng allowa
nce, cutti
ng allowa
nce a
nd so o
n are determi
ned. Use drawi
ng software to draw part drawi
ngs a
nd bla
nk drawi
ngs. This special fixture is: bori
ng 62 hole a
nd taper hole bori
ng machi
ne fixture. Whe
n desig
ni
ng the special fixture, the positio
ni
ng scheme a
nd clampi
ng scheme are determi
ned. The positio
ni
ng parts, clampi
ng compo
ne
nts, guidi
ng devices a
nd so o
n are determi
ned, a
nd the
numericalvalues of cutti
ng force a
nd clampi
ng force are calculated. AutoCAD software is used to draw assembly drawi
ngs a
nd
no
n-sta
ndard parts drawi
ngs. Keywords: automobile e
ngi
ne, cra
nkshaft, processi
ng tech
nology, special fixture 目录 摘要I ABSTRACT I 1零件的工艺性分析1 1.1零件的组成表面、技术要求及形位公差分析1 1.1.1零件的组成表面分析1 1.1.2零件的技术要求分析1 1.1.3零件的形位公差分析1 1.2零件的作用2 1.3零件的工艺性审查2 1.4确定零件的生产类型3 2拟定零件工艺路线及确定毛坯4 2.1选择定位基准4 2.1.1粗基准的选择4 2.1.2精基准的选择4 2.2工艺过程设计中应考虑的主要问题4 2.2.1加工方法选择的原则4 2.2.2加工阶段的划分5 2.2.3工序的合理组合6 2.3制定工艺路线6 2.4零件毛坯的确定8 2.5机床、夹具、刀具及量具的确定8 2.6零件加工余量的确定9 2.7切削用量及时间定额的计算12 3镗Φ62孔和锥孔夹具设计33 3.1问题的提出33 3.2定位基准的选择33 3.3切削力及夹紧力的计算34 3.5夹具设计及操作的简要说明36 结论38 致谢39 参考文献40