机械5

摘要 本设计是基于曲柄零件的加工工艺规程及一些工序的专用夹具设计。曲柄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。基准选择以曲柄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。 关键词：曲柄类零件；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. Keywords: type parts process; fixture; 目录 摘要1 ABSTRACT 2 第1章绪论4 第2章加工工艺规程设计6 2.1零件的分析6 2.1.1零件的作用6 2.2曲柄加工的主要问题和工艺过程设计所应采取的相应措施7 2.2.1孔和平面的加工顺序7 2.2.2孔系加工方案选择7 2.3曲柄加工定位基准的选择7 2.3.1粗基准的选择7 2.3.2精基准的选择8 2.4曲柄加工主要工序安排8 2.5机械加工余量、工序尺寸及毛坯尺寸的确定10 2.6确定切削用量及基本工时（机动时间） 11 3钻Φ10孔夹具设计20 3.1研究原始质料20 3.2定位、夹紧方案的选择20 3.3切削力及夹紧力的计算20 3.4误差分析与计算21 3.5钻套、衬套、钻模板设计与选用22 3.6确定夹具体结构尺寸和总体结构23 3.7夹具设计及操作的简要说明25 总结26 参考文献27