机械5

摘要 夹具这个传统的行业，在制造业飞速发展的今天，又被赋予新使命。国内经济快速发展的今天，产业结构以及机械加工制造业，其结构性变化明显。企业完成工装、夹具的优化以及改良是迫在眉睫。因现在产品种类繁多，零件结构万万千千。专用夹具的设计在不可取代的基础上，变的越来越重要。 本次毕设内容是变速器二、三档变速叉零件的加工工艺及铣宽20槽铣床专用夹具设计。该零件的作用是机器或者机构上比较重要的，为机器或者机构实现不一样的速度提供操纵。具体操作是拨动同步器齿环，实现相应档位的分开或者结合等等。 零件加工工艺的分析不仅完成了工件结构分析、基准选择、制造和加工方式选择，还根据加工工序卡完成了相应是切削数据的计算。本次专用夹具设计是为铣宽20槽进行的。根据零件的特点需要对其完成了定位夹紧方案以及装置的设计，还对夹具上其他零部件进行了设计和确定，完成设计图纸量的要求等。 关键词：变速器；二、三档变速叉；铣宽20槽；铣床；夹具 Abstract The traditio
nal i
ndustry of fixtures has bee
n give
n a
new missio
n i
n today's rapid developme
nt of ma
nufacturi
ng. Today, the rapid developme
nt of the domestic eco
nomy, the i
ndustrial structure a
nd the mecha
nical processi
ng ma
nufacturi
ng i
ndustry, its structural cha
nges are obvious. It is extremely urge
nt for e
nterprises to complete the optimizatio
n a
nd improveme
nt of tooli
ng a
nd fixtures. Because of thewidevariety of products, the structure of parts is thousa
nds of thousa
nd. The desig
n of special fixtures is becomi
ng more a
nd more importa
nt o
n a
n irreplaceable basis. The co
nte
nt of this desig
n is the processi
ng tech
nology of the seco
nd a
nd third gear shifti
ng fork parts of the tra
nsmissio
n a
nd the special fixture desig
n for the milli
ng a
nd 20-slot milli
ng machi
ne. The fu
nctio
n of the part is importa
nt o
n the machi
ne or the mecha
nism, providi
ng ma
nipulatio
n for the machi
ne or mecha
nism to achieve differe
nt speeds. The specific operatio
n is to dial the sy
nchro
nizer ri
ng to realize the separatio
n or combi
natio
n of the correspo
ndi
ng gears a
nd the like. The a
nalysis of the part processi
ng tech
nology
not o
nly completes theworkpiece structure a
nalysis, be
nchmark selectio
n, ma
nufacturi
ng a
nd processi
ng mode selectio
n, but also completes the calculatio
n of the cutti
ng data accordi
ng to the machi
ni
ng process card. This special fixture desig
n is for milli
ng 20 slots. Accordi
ng to the characteristics of the parts, it is
necessary to complete the positio
ni
ng a
nd clampi
ng scheme a
nd the desig
n of the device, a
nd also desig
n a
nd determi
ne other compo
ne
nts o
n the fixture, a
nd complete the requireme
nts of the desig
n drawi
ngs. Keywords: tra
nsmissio
n; seco
nd a
nd third gear shift fork; milli
ngwidth 20 slots; milli
ng machi
ne; fixture 目录 摘要I Abstract II 第一章引言1 第二章零件结构及加工分析、确定生产类型及制造形式3 2.1零件结构及加工分析3 2.1.1零件作用的分析3 2.1.2零件材料的分析3 2.1.3零件组成表面的分析3 2.1.4零件加工表面的分析3 2.1.5零件形位公差的分析4 2.2确定零件的生产类型4 2.3确定零件的制造形式4 第三章零件加工工艺的设计与计算6 3.1基准的选择6 3.2选择、比较和确定加工工艺路线6 3.2.1选择加工工艺路线6 3.2.2比较和确定加工工艺路线7 3.3确定机床、夹具、刀具及量具8 3.4确定零件的机加工余量8 3.5确定切削用量、计算加工工时10 第四章铣宽20槽专用夹具的设计24 4.1定位方案和元件的确定与选择24 4.1.1定位方案的确定24 4.1.2定位元件的选择24 4.2夹紧方案和元件的确定与选择25 4.2.1夹紧方案的确定25 4.2.2夹紧元件的选择25 4.3设计夹具体26 4.4选择对刀装置-对刀块27 4.5计算铣削力及夹紧力27 4.6分析定位误差28 结论29 致谢30 参考文献31