机械5

前刹车调整臂外壳的机械加工工艺及钻M8螺纹孔夹具设计 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外壳-前刹车调整臂的机械加工工艺及钻削M8螺纹孔夹具设计。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钻削M8螺纹孔专用钻床夹具。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；钻削力的计算；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、夹具体图及非标零件图的绘制。 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：外壳、前刹车调整臂、钻削、M8 Abstract Jig is a
n esse
ntial device i
n parts processi
ng. The fixture has the adva
ntages of high utilizatio
n rate, good eco
nomy, a
nd less use a
nd qua
ntity of fu
nctio
nal compo
ne
nts. With more a
nd more ki
nds of parts, shapes a
nd sizes, it is
necessary to desig
n a special fixture. The mai
n co
nte
nt of this desig
n is the shell- fro
nt brake adjusti
ng arm machi
ni
ng tech
nology a
nd drilli
ng M8 threaded hole clamp desig
n. At the begi
n
ni
ng of the desig
n,we co
nsulted the releva
nt data a
nd the domestic a
nd foreig
n literatures about machi
ne tool a
nd fixture, a
nalyzed the structure a
nd process of the partwhile a
nalyzi
ng the part drawi
ng, made clear the choice of rough datum a
nd precisio
n datum, determi
ned the machi
ni
ng allowa
nce of the part a
nd the size of the bla
nk, thus determi
ned the processi
ng process of the part a
nd calculated the cutti
ng fu
nctio
n of eachworki
ng procedure. Qua
ntity a
ndworki
ng hours. Combi
nedwith task book,we decided to desig
n special drilli
ng jig for drilli
ng M8 thread hole. The mai
n co
nte
nts of this fixture desig
n are positio
ni
ng scheme, positio
ni
ng eleme
nt selectio
n a
nd determi
natio
n; clampi
ng scheme, clampi
ng eleme
nt selectio
n a
nd determi
natio
n; fixture body desig
n a
nd determi
natio
n; drilli
ng force calculatio
n; fixture positio
ni
ng error a
nalysis. Fi
nally, the parts drawi
ng, bla
nk drawi
ng, fixture assembly drawi
ng, fixture body drawi
ng a
nd
no
n-sta
ndard parts drawi
ng are completed by CAD drawi
ng. The fixture has simple structure, co
nve
nie
nt operatio
n a
nd high productivity,which provides a theoretical basis for actual productio
n. Keywords shell, fro
nt brake adjusti
ng arm, drilli
ng, M8 目录 摘要I Abstract II 第一章绪论1 1.1机床夹具的发展史1 1.2机床夹具在机械加工中的作用1 1.3机床夹具的分类2 第二章零件的分析3 2.1零件的作用3 2.2零件的组成表面、加工要求、技术要求分析3 2.2.1零件的组成表面3 2.2.2零件的加工要求4 2.2.3零件的技术要求4 第三章零件的工艺规程设计5 3.1确定毛坯的制造形式5 3.2基准的选择与确定5 3.3加工工艺路线的确定6 3.3.1工艺路线方案一6 3.3.2工艺路线方案二6 3.3.3工艺路线的确定7 3.4加工机床及加工装备的选择7 3.5确定加工余量9 4.2计算切削用量及基本时间10 第四章钻削M8螺纹孔专用夹具设计25 4.1定位方案的确定及定位元件的选择25 4.1.1定位方案的确定25 4.1.2定位元件的选择25 4.2夹紧方案的确定及夹紧元件的选择26 4.2.1夹紧方案的确定26 4.2.2夹紧元件的选择26 4.3夹具体的设计27 4.4导向装置的确定27 4.5钻削力的计算27 4.6夹紧力的计算28 4.7定位误差的分析28 结论29 致谢30 参考文献31