机械5

摘要 本次设计是对制动器杠杆零件的加工工艺规程和一些工序的专用夹具的设计，制动器杠杆零件的主要加工表面的铣键槽，本设计主要是通过设计车外圆面的夹具保证外圆面的同轴度。由加工工艺原则可知，保证平面的加工精度比保证孔的加工精度容易很多。所以本设计遵循先面后孔的原则，并将孔与平面的加工明确划分为粗加工和精加工阶段以保证加工精度。基准选择以大外圆端面作为粗基准，以制动器大外圆端面和两个工艺孔作为精基准。主要加工工序安排是先以加工制动器大外圆端面互为基准加工出端面，再以端面定位为基准加工出工艺孔。在后续工序中，除个别工序外均用端面和工艺孔定位加工其他孔和平面。整个加工过程均选用组合机床及加工中心。 Abstract This desig
n is to desig
n the special fixture for the processi
ng procedure a
nd some procedures of brake lever parts. The milli
ng keyway for the mai
n processi
ng surface of brake lever parts is mai
nly to e
nsure the co
nce
ntricity of the outer circle surface by desig
ni
ng the fixture for the outer circle surface of thevehicle.It ca
n be see
n from the pri
nciple of processi
ng tech
nology that it is much easier to guara
ntee the machi
ni
ng accuracy of pla
ne tha
n that of hole.Therefore, the desig
n follows the pri
nciple of first face a
nd the
n hole, a
nd the processi
ng of holes a
nd pla
nes is clearly divided i
nto roughi
ng a
nd fi
nishi
ng stages to e
nsure the machi
ni
ng accuracy.The datum chooses the large outer circle e
nd as the rough datum a
nd the brake large outer circle e
nd a
nd two process holes as the precise datum.The mai
n processi
ng procedure arra
ngeme
nt is to process the e
nd face o
n the basis of processi
ng each other's large outer circle e
nd face of the brake, a
nd the
n to process the process hole o
n the basis of e
nd positio
n.I
n the followi
ng procedure, other holes a
nd pla
nes are machi
ned by e
nd face a
nd process hole positio
ni
ng except for i
ndividual procedurebi
natio
n machi
ne tools a
nd machi
ni
ng ce
nters are used i
n thewhole machi
ni
ng process. 目录 摘要II Abstract III 第一章生产目的1 第二章零件的分析1 第三章工艺规程的设计2 3.1、确定毛坯的的制造形式2 3.2、基面的选择2 3.3、选择加工方法2 3.4制订工艺路线2 工艺路线方案一： 2 3.5、机械加工余量、工序尺寸及毛坯尺寸的确定4 3.7工艺规程确切削用量5 第四章制动器杠杆车外圆夹具设计10 4.1车床夹具设计要求说明10 4.2车床夹具的设计要点10 4.3定位机构11 4.4夹紧机构12 5.4切削力及夹紧力的计算12 4.5零件的车床夹具的加工误差分析13 4.6确定夹具体结构尺寸和总体结构15 4.6零件的车床专用夹具简单使用说明16 总结17 参考文献18