机械5

螺母螺帽加工工艺与夹具设计 【摘要】 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。夹具这个传统的行业，在制造业飞速发展的今天，又被赋予了新是使命。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。 本次设计的主要内容有螺母螺帽加工工艺分析及作用夹具的设计。考虑到零件不负责，采用圆钢棒料作为其毛坯。该零件要能够承受一定的载荷。 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钻削4-Φ8孔进行的。根据零件的特点需要对其进行分度，完成了定位、夹紧方案以及元件的选择与确定，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：螺母螺帽；工艺；4-Φ8孔；专用夹具 Abstract: 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. 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. Because of thewidevariety of products， the parts structure 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 mai
n co
nte
nt of this desig
n is the
nut
nut processi
ng tech
nology a
nalysis a
nd the desig
n of the actio
n fixture. Co
nsideri
ng that the parts are
not respo
nsible， a rou
nd bar is used as the bla
nk. The part must be able towithsta
nd a certai
n load. 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 drilli
ng 4-Φ8 holes. Accordi
ng to the characteristics of the parts， it
needs to be i
ndexed， a
nd the positio
ni
ng， clampi
ng scheme a
nd compo
ne
nt selectio
n a
nd determi
natio
n are completed. The other compo
ne
nts o
n the fixture are also desig
ned a
nd determi
ned， a
nd the requireme
nts of the desig
n drawi
ngs are completed. Keywords: Nut
nut; process; 4-Φ8 hole; special fixture 目录 1零件分析和毛坯设计1 1.1零件工艺分析及生产类型确定1 1.1.1零件的组成表面分析2 1.1.2零件的技术要求分析2 1.1.3零件的形位公差分析3 1.1.4零件生产类型的确定3 1.2毛坯类型及毛坯图设计3 2机械加工工艺规程设计5 2.1零件基准的选择5 2.2零件加工工艺方案的选择，比较与确定6 2.3零件加工设备及装备的选择7 2.4机械加工余量的确定8 2.5加工工序切削用量及时间定额的计算9 3专用夹具设计19 3.1工序内容及加工要求19 3.2定位基准19 3.3夹具结构设计及工作流程19 3.4设计定位方案应满足的要求19 3.5定位方案的确定19 3.6定位元件的确定19 3.7夹紧方案的确定20 3.8夹紧元件的确定20 3.9夹具体的设计20 3.10确定导向装置—钻套21 3.11计算钻削力23 3.12计算夹紧力23 3.13定位误差的分析24 结束语25 谢辞26 参考文献27