机械5

空气压缩机气缸体加工工艺及半精铣底面夹具设计 摘要 本设计是基于空气压缩机气缸体零件的加工工艺规程及一些工序的专用夹具设计。空气压缩机气缸体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。基准选择以空气压缩机气缸体的输入轴和输出轴的支承孔作为粗基准，以顶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。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组合机床。夹具选用专用夹具，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：空气压缩机气缸体类零件；工艺；夹具； ABSTRACT The desig
n is based o
n the body parts of the processi
ng order of the processes a
nd some special fixture desig
n. Body parts of the mai
n pla
ne of the surface a
nd pore system. I
n ge
neral, the pla
ne guara
ntee processi
ng precisio
n tha
n that of holes machi
ni
ng precisio
n easy. Therefore, this desig
n follows the surface after the first hole pri
nciple. Pla
newith holes a
nd the processi
ng clearly divided i
nto roughi
ng a
nd fi
nishi
ng stages of holes to e
nsure machi
ni
ng accuracy. Datum selectio
n box i
nput shaft a
nd the output shaft of the supporti
ng hole as a rough be
nchmark,with topwith two holes as a precisio
n tech
nology refere
nce. Mai
n processes arra
ngeme
nts to support holes for positio
ni
ng a
nd processi
ng the top pla
ne, a
nd the
n the top pla
ne a
nd the supporti
ng hole locatio
n hole processi
ng tech
nology. I
n additio
n to the follow-up processes i
ndividual processes are made of the top pla
ne a
nd tech
nological hole locatio
n hole a
nd pla
ne processi
ng. Supported hole processi
ng usi
ng the method of coordi
nate bori
ng. Thewhole process of processi
ng machi
ne combi
natio
nswere selected. Selectio
n of special fixture fixture, clampi
ng mea
ns more choice of p
neumatic clampi
ng, clampi
ng reliable, i
nstitutio
ns ca
n
not be locked, so the productio
n efficie
ncy is high, suitable for large batch, li
ne processi
ng, ca
n meet the desig
n requireme
nts. Keywords: box type parts process; fixture; 目录 摘要I ABSTRACT II 第1章绪论1 第2章加工工艺规程设计3 2.1零件的分析3 2.1.1零件的作用3 2.1.2零件的工艺分析4 2.2空气压缩机气缸体加工的主要问题和工艺过程设计所应采取的相应措施4 2.2.1孔和平面的加工顺序4 2.2.2孔系加工方案选择4 2.3空气压缩机气缸体加工定位基准的选择5 2.3.1粗基准的选择5 2.3.2精基准的选择5 2.4空气压缩机气缸体加工主要工序安排6 2.5机械加工余量、工序尺寸及毛坯尺寸的确定9 2.6确定切削用量及基本工时（机动时间）[3] 9 第3章半精铣底面夹具的设计18 3.1问题的提出18 3.2夹具设计18 3.2.1定位基准的选择18 3.2.2切削力和夹紧力计算18 3.2.3定位误差分析20 3.2.4夹具设计及操作的简要说明21 总结23 参考文献24 致谢25