机械5

CA6140杠杆的加工工艺设计 摘要 本设计是CA6140杠杆零件的加工工艺规程计。CA6140杠杆零件的主要加工表面是平面及孔。一般来说，保证平面的加工精度要比保证孔的加工精度容易。因此，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成粗加工和精加工阶段以保证孔的加工精度。基准的选择以杠杆外圆面作为粗基准，以孔及其下表面作为精基准。先将底面加工出来，然后作为定位基准，在以底面作为精基准加工孔。 关键词CA6140杠杆，加工工艺 ABSTRACT This desig
n is the processi
ng specificatio
n of CA6140 lever parts. The mai
n machi
ni
ng surfaces of CA6140 lever parts are pla
ne a
nd hole. Ge
nerally speaki
ng, it is easier to e
nsure the machi
ni
ng accuracy of the pla
ne tha
n to e
nsure the machi
ni
ng accuracy of the hole. Therefore, the desig
n follows the pri
nciple of first face a
nd rear hole. The machi
ni
ng of holes a
nd pla
nes is clearly divided i
nto rough machi
ni
ng a
nd fi
nishi
ng stages to e
nsure the machi
ni
ng accuracy of holes. The choice of datum is based o
n the outer surface of the lever as the rough datum, a
nd the hole a
nd its lower surface as the precise datum. First, the bottom surface is machi
ned, a
nd the
n as the positio
ni
ng datum, the bottom surface is used as the fi
ne datum machi
ni
ng hole. Keywords CA6140 lever, processi
ng tech
nology 目录 摘要1 ABSTRACT 2 1杠杆加工工艺规程设计4 1零件的分析4 1.1零件的作用4 1.2零件的工艺分析4 2杠杆加工的主要问题和工艺过程设计所应采取的相应措施5 2.1确定毛坯的制造形式5 2.2基面的选择5 2.3确定工艺路线5 2.4机械加工余量、工序尺寸及毛坯尺寸的确定6 2.2.5确定切削用量7 2.2.6确定基本工时18 3小结23 4.铣Ф25孔下表面（即宽30右端面）夹具设计25 4.1机床夹具介绍25 4.2现代夹具的发展方向25 4.3问题提出27 4.4定位元件的选择27 4.5夹紧元件的确定及夹紧力计算27 4.6定位误差的计算28 4.7夹具简要说明28 参考文献30 致谢31