机械5

齿条拨叉加工工艺及工装设计 摘要 机床夹具设计是现代机械零件制造和加工过程中，不能缺少的组成部分。机床夹具依据其类型不同分成不同种类，以适应不同复杂程度的零件和不同的加工工序和工步等。所以，对其进行研究有意义。 本次研究的对象是—齿条拨叉。是机器上重要的零件之一。使机构相应运动按照工作者的要求工作，获得所需的速度和扭矩的作用。另外，本次设计的齿条拨叉其零件材料为ZG45。设计内容包含加工工艺设计和铣头部25斜面夹具设计。 在对零件图解读后，确定零件生产类型，编写工艺路线，确定主轴转速、切削量等，填写工序卡。完成零件图、毛坯图绘制。经过分析决定设计铣头部25斜面铣床专用夹具，确定定位、夹紧方案；选择定位、夹紧元件；设计夹具体等。 关键词：齿条拨叉、加工工艺、铣头部25斜面、铣床 ABSTRACT Machi
ne tool fixture desig
n is a
n i
ntegral part of moder
n machi
nery parts ma
nufacturi
ng a
nd processi
ng. Machi
ne tools are divided i
nto differe
nt types accordi
ng to their differe
nt types to adapt to differe
nt complex parts a
nd differe
nt processi
ng procedures a
ndwork steps. Therefore, it is of great sig
nifica
nce to study it. The object of this study is the rack fork. It is o
ne of the importa
nt parts o
n the machi
ne. Make the correspo
ndi
ng moveme
nt of the mecha
nismwork accordi
ng to the requireme
nts of theworkers to obtai
n the required speed a
nd torque. I
n additio
n, the desig
n of rack shifti
ng fork material is ZG45. The desig
n i
ncludes processi
ng tech
nology desig
n a
nd milli
ng head 25 slope fixture desig
n. After the graphic readi
ng of the parts, determi
ne the productio
n type of the parts, compile the process route, determi
ne the spi
ndle speed a
nd cutti
ngvolume, a
nd fill i
n the process card. Complete the drawi
ng of part drawi
ng a
nd bla
nk drawi
ng. After a
nalysis,we decided to desig
n the special fixture for milli
ng the 25 slope milli
ng machi
ne, co
nfirm the positio
ni
ng a
nd clampi
ng scheme, select the positio
ni
ng a
nd clampi
ng eleme
nts, desig
n the clamp a
nd so o
n. Keywords: rack shifti
ng fork, processi
ng tech
nology, milli
ng head 25 i
ncli
ned pla
ne, milli
ng machi
ne 目录 摘要I ABSTRACT II 第1章绪论1 1.1机床夹具的概述1 1.2机床夹具的分类1 1.3夹具设计的特点和基本要求2 1.3.1夹具设计的特点2 1.3.2夹具设计的基本要求2 1.4机床夹具在机械加工中的作用3 1.5机床夹具的发展趋势3 第2章零件的工艺性分析5 2.1零件的结构工艺性分析概述5 2.2零件的组成表面、技术要求及形位公差分析5 2.2.1零件的组成表面分析5 2.2.2零件的技术要求分析5 2.2.3零件的形位公差分析5 2.3零件的作用5 2.4零件材料的确定6 2.5确定零件的生产类型6 2.6确定零件的毛坯类型6 第3章拟定零件工艺路线8 3.1选择定位基准8 3.1.1粗基准的选择8 3.1.2精基准的选择8 3.2确定各表面的加工方案8 3.3工艺路线的拟定9 3.4确定机床、夹具、刀具及量具10 3.5确定零件加工余量11 3.6计算切削用量及时间定额12 第4章专用夹具的设计23 4.1选择定位方案和定位元件23 4.2选择夹紧方案和夹紧元件24 4.3夹具体的设计24 4.4选择导向装置—对刀块25 4.5计算铣削力25 4.6计算夹紧力25 4.7分析定位误差26 结论27 致谢28 参考文献29