机械5

摘要 本次夹具研究的对象是轴支架。轴支架为轴提供支承保证回转运动。为轴能够传递动力还有相应的运动提供保障。轴支架其材料选择HT150，该材料机械强度是很好的，并且减震性也相当不错。可以用来加工生产应力中等的零部件。 本设计主要内容包括轴支架的加工工艺规程以及镗Ф55H7孔镗床专用夹具设计。在设计过程中完成了零件图、毛坯图、夹具装配图和夹具体还有所有非标零件图的绘制及说明书的编写。针对镗Ф55H7孔的加工设计了一套镗床专用夹具，在完成零件结构分析基础上，确定采用T618卧式镗床对其进行加工。利用定位块、定位销和工件插销满足定位要求，有通过夹紧装置保证加工过程中工件位置不发生变化。 关键词：轴支架、加工工艺，Ф55H7孔、T618、卧式镗床 Abstract The object of this fixture study is the shaft bracket. The shaft bracket provides support for the shaft to e
nsure swivel motio
n. It provides protectio
n for the shaft to tra
nsmit power a
nd correspo
ndi
ng moveme
nt. The material of the shaft bracket is HT150. The mecha
nical stre
ngth of the material isvery good a
nd the shock absorptio
n is quite good. Ca
n be used to process partswith medium stress. The mai
n co
nte
nts of this desig
n i
nclude the machi
ni
ng process specificatio
n of the shaft bracket a
nd the special fixture desig
n of the Bori
ngФ55H7 hole bori
ng machi
ne. I
n the desig
n process, the parts drawi
ng, the bla
nk drawi
ng, the fixture assembly drawi
ng a
nd the clip co
ncrete a
nd the drawi
ng of all
no
n-sta
ndard parts drawi
ng a
nd the preparatio
n of the specificatio
n are completed. A set of special clamps for the bori
ng machi
newas desig
ned for the processi
ng of the Bori
ngФ55H7 hole. Based o
n the a
nalysis of the part structure, the T618 horizo
ntal bori
ng machi
newas used for machi
ni
ng. The positio
ni
ng block, the positio
ni
ng pi
n a
nd theworkpiece pi
n are used to meet the positio
ni
ng requireme
nts, a
nd the clampi
ng device e
nsures that the positio
n of theworkpiece does
not cha
nge duri
ng the machi
ni
ng process. Keywords: shaft bracket, machi
ni
ng process,Ф55H7 hole, T618, horizo
ntal bori
ng machi
ne 目录 摘要I Abstract II 1引言1 2分析零件结构、确定制造形式及生产类型3 2.1分析轴支架的作用3 2.2分析轴支架的结构3 2.2.1分析轴支架组成表面3 2.2.2分析轴支架加工表面加工要求4 2.2.3分析轴支架形位公差4 2.3选择轴支架的材料4 2.4确定制造形式5 2.5确定生产类型5 3轴支架加工工艺规程的设计7 3.1零件加工基准的选择7 3.1.1粗基准的选择7 3.1.1精基准的选择7 3.2确定加工工艺路线7 3.2.1加工工艺路线方案1和方案2 7 3.2.2确定加工工艺路线8 3.3选择加工机床、装夹夹具、切削刀具及测量量具8 3.4零件加工余量确定9 3.5零件切削用量、加工工时的确定11 4镗Ф55H7孔专用夹具设计28 4.1设计定位方案28 4.2确定定位元件28 4.3设计夹紧方案28 4.4确定夹紧元件29 4.5设计夹具体29 4.6导向装置的选择30 4.7计算镗削力30 4.8计算夹紧力31 4.9分析定位误差32 5结论33 6致谢34 7参考文献35