机械5

直齿圆柱高精度齿轮的加工工艺及夹具设计 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直齿圆柱高精度齿轮的加工工艺及夹具设计。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22JS9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：齿轮、加工工艺、插削、22JS9键槽、专用夹具 Abstract The fixture is a
n i
ndispe
nsable device i
n the processi
ng of parts. The utility rate of the fixture is high, the eco
nomy is good, a
nd the use a
nd qua
ntity of the fu
nctio
nal compo
ne
nts are few. As the types, shapes a
nd sizes of parts are more a
nd more, it is
necessary to desig
n a set of special fixture. The mai
n co
nte
nt of this desig
n is the processi
ng tech
nology a
nd fixture desig
n of high precisio
n gearwith straight tooth cyli
nder. At the begi
n
ni
ng of desig
n a
nd co
nsulti
ng related data at home a
nd abroad o
n the fixture of literature, structure a
nd process of parts i
n parts of the a
nalysis a
nd a
nalysis, clear coarse a
nd fi
ne refere
nce base selectio
n, determi
natio
n of machi
ni
ng allowa
nce a
nd bla
nk parts size, so as to determi
ne the parts processi
ng process, cutti
ng parameters a
nd the calculatio
n of the process time the. I
n combi
natio
nwith the task book, a special fixture for the desig
n of 22JS9 keyway is desig
ned. The mai
n co
nte
nts of this fixture desig
n i
nclude locatio
n scheme, selectio
n a
nd determi
natio
n of positio
ni
ng eleme
nts, clampi
ng scheme a
nd selectio
n a
nd determi
natio
n of clampi
ng eleme
nts, specific desig
n a
nd determi
natio
n of clips, calculatio
n of cutti
ng force a
nd a
nalysis of fixture locatio
n errors. Fi
nally, the drawi
ng of the parts drawi
ng, the bla
nk drawi
ng, the fixture assembly drawi
ng a
nd the specific drawi
ng are completed through the CAD drawi
ng parts. The fixture desig
ned i
n this paper is simple i
n structure, co
nve
nie
nt i
n operatio
n a
nd high i
n productivity,which provides a certai
n theoretical basis for actual productio
n. Keywords: gear, processi
ng tech
nology, cutti
ng, 22JS9 keyway, special fixture 目录 摘要I Abstract II 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5 2.2.1粗基准选择5 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加工余量的确定8 2.6切削加工基本时间计算9 3插削22JS9键槽专用夹具设计22 3.1定位方案22 3.1.1定位方案的确定22 3.1.2定位元件的选择22 3.1.3分析计算定位误差22 3.2夹紧方案22 3.2.1夹紧方案的确定22 3.2.2夹紧元件的选择23 3.2.3估算切削力和夹紧力23 3.3对刀、导向元件24 3.4其他元件24 3.5夹具体24 3.6装配图25 结论27 致谢28 参考文献29