机械5

皮带轮的机械加工工规程及插20键槽夹具设计 摘要 夹具是零件加工中必不可少的装置。夹具利用率高，经济性好，对功能组件的使用和数量少。随着零件种类、外形及尺寸的种类越来越多，设计一套专用夹具非常有必要。 本次设计的主要内容是皮带轮的机械加工工规程及夹具设计。设计之初查阅相关数据及国内外关于机床夹具的文献，在分析零件图的同时对零件的结构和工艺进行分析，明确粗基准和精基准的选择，确定零件的加工余量与毛坯的尺寸、从而确定零件的加工工艺过程、计算各工序的切削用量及工时。 结合任务书决定设计插削20键槽专用夹具。本次夹具设计的主要内容有：定位方案、定位元件的选择与确定；夹紧方案、夹紧元件的选择与确定；夹具体的设计与确定；切削力的计算；夹具定位误差的分析等。最后，通过CAD绘图零件完成零件图、毛坯图、夹具装配图、夹具体图的绘制。 本次设计的夹具其结构简单、操作便捷、生产率高，为实际的生产提供一定的理论依据。 关键词：皮带轮、加工工艺、插削、20键槽、专用夹具 Abstract The fixture is a
n i
ndispe
nsable part of the part machi
ni
ng. Fixture utilizatio
n is high, the eco
nomy is good, the use of fu
nctio
nal compo
ne
nts a
nd the
number of small. With the type of parts, shape a
nd size of the more a
nd more types of desig
n a special fixture is
necessary. The mai
n co
nte
nt of this desig
n is the pulley of the mecha
nical processi
ngworkers a
nd fixture desig
n. At the begi
n
ni
ng of the desig
n, the releva
nt data a
nd the literature o
n the machi
ne fixture at home a
nd abroad are a
nalyzed. At the same time, the structure a
nd process of the parts are a
nalyzed, a
nd the selectio
n of the rough refere
nce a
nd the fi
ne refere
nce is made, a
nd the machi
ni
ng allowa
nce a
nd the size of the bla
nk are determi
ned. So as to determi
ne the processi
ng of parts process, calculate the amou
nt of cutti
ng a
ndworki
ng hours of each process. Combi
nedwith the task book to determi
ne the desig
n plug 20 key slot special fixture. The mai
n co
nte
nts of the fixture desig
n are: positio
ni
ng program, positio
ni
ng eleme
nt selectio
n a
nd determi
natio
n; clampi
ng program, clampi
ng eleme
nt selectio
n a
nd determi
natio
n; clip desig
n a
nd determi
natio
n; cutti
ng force calculatio
n; fixture positio
ni
ng error a
nalysis. Fi
nally, through the CAD drawi
ng parts to complete the parts map, rough map, fixture assembly map, clip drawi
ng drawi
ng. The desig
n of the fixture its simple structure, easy operatio
n, high productivity, for the actual productio
n to provide a certai
n theoretical basis. Keywords：Pulley, processi
ng tech
nology, cutti
ng, 20 keyway, special fixture 目录 摘要I Abstract II 0引言1 1零件分析3 1.1零件种类及结构分析3 1.2零件主要技术要求分析4 1.3零件结构工艺性分析4 2机械加工工艺规程设计5 2.1毛坯选择5 2.2定位基准选择6 2.2.1粗基准选择6 2.2.2精基准选择6 2.3工艺路线拟定6 2.4工序顺序安排7 2.5工序尺寸计算8 2.5.1径向直径尺寸的工序尺寸计算8 2.5.2轴向长度尺寸的工序尺寸计算9 2.6切削加工基本时间计算9 2.6.1粗车尺寸100右端面工序基本时间计算9 2.6.2粗车Φ500外圆工序基本时间计算9 2.6.3掉头粗车尺寸100左端面工序基本时间计算10 2.6.4粗车Φ70H7内孔工序基本时间计算10 2.6.5半精车尺寸100右端面工序基本时间计算11 2.6.6半精车Φ500外圆工序基本时间计算11 2.6.7掉头半精车尺寸100左端面工序基本时间计算12 2.6.8半精车Φ70H7内孔工序基本时间计算12 2.6.9精车Φ70H7内孔工序基本时间计算13 2.6.10粗插20键槽工序基本时间计算13 2.6.11半精插20键槽工序基本时间计算14 2.6.12精插20键槽工序基本时间计算14 3夹具设计15 3.1定位方案15 3.1.1定位方案的确定15 3.1.2定位元件的选择15 3.1.3分析计算定位误差15 3.2夹紧方案15 3.2.1夹紧方案的确定15 3.2.2夹紧元件的选择16 3.2.3估算夹紧力16 3.3对刀、导向元件17 3.4其他元件17 3.5夹具体17 3.6装配图18 结论20 致谢21 参考文献22