机械5

前刹车调整臂外壳的机械加工工艺及钻5-Ф4.3孔夹具设计 摘要 本课题的主要研究内容是外壳-前刹车调整臂的机械加工工艺及钻削5-Ф4.3圆柱孔夹具设计。外壳-前刹车调整臂零件是一种很重要的零件。本课题的主要任务就是设计一种加工成本低，加工时间短，加工合理的一种方案，还要设计一种专用夹具。在设计初，首先要看懂零件图，并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，从而明确零件的加工工艺过程，最后再计算各工序的切削用量及工时。 夹具是零件加工的夹紧装置，是加工零件的一种必不可少的装置。随着零件的尺寸变化，越来越多的夹具被淘汰了，因此，设计一套专用夹具是十分有必要的。在设计专用夹具时要考虑工件的定位方案，工件的夹紧方案和设计夹紧机构，夹具的其他组成部分，夹具的结构形式等。 关键词：外壳、前刹车调整臂、加工工艺、5-Ф4.3 Abstract The mai
n research co
nte
nts of this paper are the machi
ni
ng tech
nology of the housi
ng-fro
nt brake adjusti
ng arm a
nd the desig
n of the clamp for drilli
ng 5-_4.3 cyli
ndrical holes. Shell fro
nt brake assembly part is a very importa
nt part. The mai
n task of this project is to desig
n a low cost, short processi
ng time, a reaso
nable processi
ng scheme, but also to desig
n a special fixture. At the begi
n
ni
ng of desig
n, it is
necessary to u
ndersta
nd the part drawi
ng, a
nalyze the structure a
nd process of the part, determi
ne the selectio
n of rough a
nd precisio
n datum, determi
ne the machi
ni
ng allowa
nce a
nd the size of the bla
nk, so as to defi
ne the processi
ng process of the part, a
nd fi
nally calculate the cutti
ng parameters a
nd time of each process. Jig is the clampi
ng device for parts processi
ng, which is a
n esse
ntial device for processi
ng parts. With the cha
nge of the size of parts, more a
nd more fixtures are elimi
nated. Therefore, it is
necessary to desig
n a set of special fixtures. Whe
n desig
ni
ng the special fixture, we should co
nsider the positio
ni
ng scheme of the workpiece, the clampi
ng scheme of the workpiece a
nd the desig
n of the clampi
ng mecha
nism, other parts of the fixture, the structure of the fixture a
nd so o
n. Key words shell, fro
nt brake adjusti
ng arm, processi
ng tech
nology, 5- 4.3 目录 摘要I Abstract II 第一章引言1 1.1机械加工工艺规程概述1 1.2机械加工艺规程的作用1 1.3工艺规程制订的原则1 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 3.6计算切削用量及基本时间10 第四章钻削5-Ф4.3圆柱孔夹具设计25 4.1确定定位方案及装置25 4.2确定夹紧方案及装置25 4.3设计夹具体26 4.4选择导向装置26 4.5计算钻削力和夹紧力29 4.7分析定位误差30 结论31 致谢32 参考文献33