机械5

叉杆加工工艺及夹具设计 摘要 本设计是基于叉杆零件的加工工艺规程及一些工序的专用夹具设计。叉杆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。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。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。支承孔系的加工采用的是坐标法镗孔。整个加工过程均选用通用。夹具选用专用夹具，夹紧方式多选用气动夹紧，夹紧可靠，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：叉杆类零件；工艺；夹具； Machi
ni
ng tech
nology a
nd fixture desig
n of fork bar parts Abstract This desig
n is the special fixture for machi
ni
ng tech
nology for the chemical pipeli
ne parts a
nd process desig
n based o
n. The mai
n processi
ng surface chemical pipeli
ne parts is the pla
ne a
nd a series of hole. I
n ge
neral, e
nsure the machi
ni
ng accuracy of pla
ne tha
n to e
nsure the accuracy of the processi
ng easily. Therefore, the desig
n follows the surface after the first hole pri
nciple. A
nd the hole a
nd the pla
ne processi
ng clearly divided i
nto roughi
ng a
nd fi
nishi
ng stages to e
nsure machi
ni
ng precisio
n. The mai
n process of machi
ni
ng tech
nology is first to support hole positio
ni
ng processi
ng the top pla
ne, a
nd the
n the top pla
ne a
nd the series of supporti
ng hole locatio
n hole processi
ng tech
nology. I
n additio
n to the follow-up processes are i
ndividual processes with the top pla
ne positio
ni
ng tech
nology a
nd other processi
ng Ko
ng a
nd pla
ne. Processi
ng support holes usi
ng the coordi
nate bori
ng. The whole process selectio
n of ge
neral. The special fixture fixture, clampi
ng mea
ns more choice of p
neumatic clampi
ng, clampi
ng reliable, age
ncies ca
n
not self-locki
ng, therefore the productio
n efficie
ncy is high, suitable for large batch, li
ne processi
ng, ca
n meet the desig
n requireme
nts. Keywords: chemical pipe parts; tech
nology; fixture; 目录 第1章机械加工工艺规程设计1 1.1零件的分析1 1.1.1零件的作用1 1.1.2零件的工艺分析1 1.2叉杆加工的主要问题和工艺过程设计所应采取的相应措施2 1.2.1孔和平面的加工顺序2 1.2.2孔系加工方案选择2 1.3叉杆加工定位基准的选择3 1.3.1粗基准的选择3 1.3.2精基准的选择3 1.4叉杆加工主要工序安排3 1.5机械加工余量、工序尺寸及毛坯尺寸的确定10 1.6选择加工设备和工艺装备11 1.6.1机床选用11 1.6.2选择刀具11 1.6.3选择量具11 1.7机械加工余量、工序尺寸及毛坯尺寸的确定11 1.8确定切削用量及基本工时（机动时间） 13 第2章钻M8孔夹具设计18 2.1研究原始质料18 2.2定位基准的选择18 2.3切削力及夹紧力的计算18 2.4误差分析与计算19 2.5零、部件的设计与选用20 2.5.1定位销选用20 2.5.3钻套、衬套、钻模板设计与选用21 2.6夹具设计及操作的简要说明22 总结23 参考文献24 致谢25