机械5

解放牌CA1041汽车后桥壳体加工工艺规程及铣床夹具设计 摘要：为了使汽车后桥壳体在加工工艺过程中保证其所要求的强度、精度和平整度，此次夹具体设计可更进一步配合机床完成整个加工过程中所需要的加紧力要求，以及铣平面加工过程的所需移动自由度的限制，从而保证零件尺寸及性能加工要求。在此次夹具体设计中通过了解零件加工尺寸及性能需求以及现状分析结合机械设计相关文献，学习公差尺寸以及配合标准。计算查找其进给量、切削量、配合公差以及所需夹紧力等。为进一步夹具设计提供必要基矗在整个夹具设计中，由于工件两端为圆柱体所以在加紧过程中采用V型块进行限位，并配合压条进一步限制其在Z轴上的移动，又通过中心盘与中心孔配合限制其在X、Y轴上的移动。实现加紧定位的目的。通过这次的工艺规程及夹具体设计我更进一步实现了理论与实践的相互统一，加强了在理论基础上对专业知识的巩固和细化，在此基础上也对夹具体的学习和了解有了更深一层次的认知，充分认识到设计的严谨性和专业性要求。最终此次的夹具体设计总共涵盖了一套工艺和一套夹具，夹具形式为手动夹紧。除此以外根据设计任务，还完成了面积总和为两张A0图纸的说明图，初步达到了老师要求。 关键词：后桥壳体；工艺规程；专用夹具 Process specificatio
n for rear axle shell parts of Jiefa
ng CA1041 vehicle a
nd desig
n of clampi
ng fixture for milli
ng spri
ng seat ABSTRACT：I
n order to e
nsure the stre
ngth, precisio
n a
nd smooth
ness of the rear axle housi
ng i
n the process of e
ngi
neeri
ng, The clampi
ng desig
n ca
n further cooperate with the requireme
nts of the machi
ne tool to complete the whole machi
ni
ng process a
nd the restrictio
ns of the required movi
ng degrees of freedom i
n each machi
ni
ng process, thus e
nsuri
ng the machi
ni
ng requireme
nts of the parts. I
n the desig
n of the clip, through the u
ndersta
ndi
ng of parts processi
ng requireme
nts a
nd curre
nt situatio
n a
nalysis combi
ned with mecha
nical desig
n refere
nce literature, lear
n tolera
nce dime
nsio
ns a
nd matchi
ng sta
ndards. Calculate the feed, cutti
ng, fit tolera
nce a
nd clampi
ng force. Provide
necessary fou
ndatio
n for further fixture desig
n. I
n the whole fixture desig
n, because the two e
nds of the workpiece are cyli
ndrical, the V-shaped block is used to limit the positio
n i
n the tighte
ni
ng process, a
nd the moveme
nt o
n the Z axis is further restricted by the pressure bar. The ce
nter plate a
nd the ce
nter hole are used to restrict the moveme
nt of the ce
nter hole o
n the XY axis. To achieve the purpose of stre
ngthe
ni
ng positio
ni
ng. I have further realized the u
nificatio
n of theory a
nd practice through this process procedure a
nd clip desig
n, a
nd stre
ngthe
ned the co
nsolidatio
n a
nd refi
neme
nt of professio
nal k
nowledge o
n the basis of theory. O
n this basis, we also have a deeper u
ndersta
ndi
ng of the specific lear
ni
ng a
nd u
ndersta
ndi
ng, fully aware of the rigorous a
nd professio
nal requireme
nts of the desig
n. The fi
nal clip desig
n covers a set of processes a
nd a set of clamps i
n the form of ma
nual clampi
ng. I
n additio
n, accordi
ng to the desig
n task, completed the area of the total of two A0 drawi
ngs, the prelimi
nary requireme
nts of the teacher. Key words: automobile rear axle; process a
nalysis; special clam 目录 1绪论1 1.1关于重型汽车后桥的前景分析1 1.2载重汽车后桥壳体的构造1 1.3轻型载重汽车后桥壳体的性能要求2 2零件的分析3 2.1零件的基本作用3 2.2零件加工的工艺分析4 2.3生产类型的确定4 2.4确定毛坯的制造形式4 2.5加工工艺过程分析及基准平面的选择4 3拟定机械加工工艺路线5 3.1拟定工艺方案5 3.2工艺方案比较分析7 3.3加工阶段的划分和检验工序的安排8 3.4刀具的选取8 4零件毛坯尺寸的确定9 5确定切削用量及工时定额11 5.1工序Ⅳ的工时定额11 6夹具设计13 6.1铣床专用夹具设计13 6.2加工工艺分析13 6.3定方案，设计定位元件13 6.4夹紧力校验13 6.5误差分析15 6.6夹具体的强度校核15 6.7夹具体的设计16 6.8夹具体的设计及操作说明16 7 CAD绘图简介17 结论18 致谢19 参考文献20