摘要 本设计是基于汽车拨叉零件的加工工艺规程及一些工序的专用夹具设计。汽车拨叉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专用夹具，夹紧方式多选用手动夹紧，夹紧可靠，机构可以适当设计成自锁，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：汽车拨叉零件；工艺；夹具； 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 摘要I ABSTRACT II 目录0 第一章机械加工工艺规程设计2 1.1零件的分析2 1.1.1零件的作用2 1.1.2零件的工艺分析2 1.1.3孔和平面的加工顺序3 1.2孔系加工方案选择3 1.3汽车拨叉加工定位基准的选择4 1.3.1粗基准的选择4 1.3.2精基准的选择4 1.4汽车拨叉加工主要工序安排4 第二章余量及毛胚尺寸确定8 2.1机械加工余量、工序尺寸及毛坯尺寸的确定8 2.2毛坯种类的选择8 2.3选择加工设备和工艺装备9 2.3.1机床选用9 2.3.2选择刀具9 2.3.3选择量具9 2.4机械加工余量、工序尺寸及毛坯尺寸的确定10 第三章切削用量计算12 3.1工序1 12 3.2工序2 12 3.3工序3：铣圆柱Φ34一侧端面12 3.4工序4：铣圆柱Φ34另外一侧端面13 3.5工序5：铣叉口端面一侧端面14 3.6工序6：铣叉口端面另外一侧端面16 3.7工序7：钻、扩、孔16 3.8工序8：粗镗、精镗Φ82孔19 3.9工序9：铣尺寸10MM两端面20 3.10工序10：铣削凸台上16的槽口面21 3.11工序11：铣削凸台M10X1端面23 3.12工序12：钻M10X1底孔及攻M10X1螺纹孔24 第四章专用夹具设计25 4.1研究原始质料25 4.2定位基准的选择25 4.3夹具的导向25 4.4钻孔与工件之间的切屑间隙26 4.5切削力及夹紧力的计算26 4.6定位误差的分析27 4.7钻套、衬套、钻模板设计与选用28 4.8确定夹具体结构和总体结构29 4.9夹具设计及操作的简要说明30 总结32 参考文献33 致谢34