机械5

摘要 支座零件的主要加工表面是平面及孔系。一般来说，保证平面的加工精度要比保证孔系的加工精度容易。本设计是基于支座零件的加工工艺规程及一些工序的专用夹具设计。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系加工精度。基准选择以支座的输入轴和输出轴的支承孔作为粗基准，以底面与两个工艺孔作为精基准。主要加工工序安排是先以支承孔系定位加工出顶平面，再以顶平面与支承孔系定位加工出工艺孔。在后续工序中除个别工序外均用顶平面和工艺孔定位加工其他孔系与平面。夹具选用专用夹具，机构可以不必自锁，因此生产效率较高，适用于大批量、流水线上加工，能够满足设计要求。 关键词：支座类零件；工艺；夹具 Abstract The mai
n machi
ni
ng surface of beari
ng parts is pla
ne a
nd hole system. Ge
nerally speaki
ng, it is easier to e
nsure the machi
ni
ng accuracy of pla
ne tha
n hole system. This desig
n is based o
n the processi
ng tech
nology of beari
ng parts a
nd some special fixture desig
n process. Therefore, the desig
n follows the pri
nciple of first face a
nd the
n hole. The machi
ni
ng of hole a
nd pla
ne is clearly divided i
nto rough a
nd fi
nishi
ng stages to e
nsure the machi
ni
ng accuracy of hole system. The support holes of the i
nput shaft a
nd output shaft of the support are chose
n as the rough datum a
nd the bottom surface a
nd two process holes as the fi
ne datum. The mai
n process arra
ngeme
nt is that the top pla
ne is processed by the supporti
ng hole system a
nd the
n the process hole is processed by the supporti
ng hole system. The top pla
ne a
nd process hole are used to locate a
nd process other hole system a
nd pla
ne i
n the followi
ng process except for some procedures. Fixture selectio
n special fixture, the mecha
nism ca
n
not be self-locki
ng, so the productio
n efficie
ncy is higher, suitable for large qua
ntities, productio
n li
ne processi
ng, ca
n meet the desig
n requireme
nts. Keywords: beari
ng parts; Process; Fixture 目录 1.加工工艺课程设计1 1.1零件的分析1 1.2支座加工的主要问题和工艺过程设计所应采取的相应措施2 1.3支座加工定位基准的选择2 1.4支座加工主要工序安排3 1.5机械加工余量、工序尺寸及毛坯尺寸的确定4 1.6确定切削用量及基本时间5 2夹具设计6 2.1夹具类型及使用机床选择7 2.2定位基准及定位元件选择7 2.3夹紧机构及夹紧元件初步选择8 2.4钻模板设计8 2.5计算切削力和夹紧力9 2.6定位误差分析10 2.7夹具体设计10 参考文献12