机械5

前刹车调整臂外壳的机械加工工艺规程及铣12左端面夹具设计 摘要 设计的主要内容有：外壳-前刹车调整臂的机械加工工艺设计；铣削12左端面夹具设计。考虑到零件在机床运行过程中所受冲击不大，零件结构又比较简单，故选择铸造。调整臂外壳的主要加工面是调整臂的几个端面、方槽和孔，由于面的加工精度要比孔的加工精度容易保证。因此，采用先面后孔的原则，以保证加工精度。为了加工精确快速，特别设计了铣削12左端面夹具设计，对于加工零件采用两面一销进行定位，其他零件的定位采用了一面两销定位。由于该零件的尺寸不大，所需的夹紧力不大。因此，夹紧方式都采用手动夹紧，它的夹紧方式简单，机构的设计更为方便，满足夹紧要求。 关键词：外壳、前刹车调整臂、铣削、12左端面，夹具 Abstract The mai
n co
nte
nts of the desig
n are shell - fro
nt brake adjusti
ng arm machi
ni
ng process desig
n; milli
ng 12 left e
nd face clamp desig
n. Co
nsideri
ng that the parts suffered little impact duri
ng the operatio
n of the machi
ne tool a
nd the structure of the parts was relatively simple, casti
ng was chose
n. The mai
n machi
ni
ng surface of the adjusti
ng arm shell is several e
nd faces, square grooves a
nd holes of the adjusti
ng arm, because the machi
ni
ng accuracy of the surface is easier to e
nsure tha
n that of the holes. Therefore, the pri
nciple of first face a
nd back hole is adopted to e
nsure machi
ni
ng accuracy. I
n order to process accurately a
nd quickly, the clamp desig
n for milli
ng 12 left e
nd face is specially desig
ned. Two sides a
nd o
ne pi
n are used to locate the machi
ni
ng parts, a
nd o
ne side a
nd two pi
ns are used to locate the other parts. Because the size of the part is small, the clampi
ng force is
not big e
nough. Therefore, the clampi
ng methods are all ma
nual clampi
ng, its clampi
ng method is simple, the desig
n of the mecha
nism is more co
nve
nie
nt, to meet the clampi
ng requireme
nts. Key words shell, fro
nt brake adjusti
ng arm, milli
ng, 12 left e
nd face, jig 目录 摘要I Abstract II 第一章绪论1 1.1夹具夹紧装置及夹具体的基本要求1 1.2机床夹具功用1 1.3机床夹具在机械加工中的作用2 1.4机床夹具的设计要求2 第二章零件的分析4 2.1零件的作用4 2.2零件的组成表面、加工要求、技术要求分析4 2.2.1零件的组成表面4 2.2.2零件的加工要求5 2.2.3零件的技术要求5 第三章零件的工艺规程设计6 3.1确定毛坯的制造形式6 3.2基准的选择与确定6 3.3加工工艺路线的确定7 3.3.1工艺路线方案一7 3.3.2工艺路线方案二7 3.3.3工艺路线的确定8 3.4加工机床及加工装备的选择8 3.5确定加工余量10 4.2计算切削用量及基本时间11 第四章铣削12左端面夹具设计26 4.1定位方案及定位元件的确定与选择26 4.1.1定位方案的确定26 4.1.2定位元件的选择26 4.2夹紧方案及装置的确定与选择27 4.2.1夹紧方案的确定27 4.2.2夹紧元件的选择27 4.3夹具体的确定27 4.4导向装置的确定28 4.5计算铣削力28 4.6计算夹紧力29 4.7定位误差的分析29 结论30 致谢31 参考文献32