机械5

机床变速箱机械加工工艺规程及夹具设计 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。 本次设计的题目是机床变速箱机械加工工艺规程及夹具设计，研究的机床变速箱为安装齿轮、轴等零部件提供保障。为机床实现不同转速发挥作用。设计内容包含工艺设计和夹具设计。 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。经过分析决定设计钻底面8个孔钻床专用夹具，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：机床变速箱、工艺规程、夹具、钻底面8个孔 ABSTRACT Fixture desig
n of machi
ne tools is a
n i
ndispe
nsable part i
n the process of ma
nufacturi
ng a
nd processi
ng of moder
n mecha
nical parts. Machi
ne tool fixtures ca
n be divided i
nto differe
nt types accordi
ng to their types, so as to adapt to differe
nt complex parts a
nd differe
nt processi
ng procedures a
nd steps. Therefore, it is mea
ni
ngful to study it. The topic of this desig
n is the machi
ne tool gearbox machi
ni
ng process rules a
nd fixture desig
n, the machi
ne tool gearbox for the i
nstallatio
n of gears, shafts a
nd other compo
ne
nts to provide protectio
n. It ca
n play a role i
n realizi
ng differe
nt rotatio
nal speeds of machi
ne tools. The desig
n i
ncludes process desig
n a
nd fixture desig
n. After i
nterpreti
ng the part drawi
ngs, determi
ne the type of part productio
n, compile the process route, determi
ne the spi
ndle speed, cutti
ng amou
nt, etc., a
nd fill i
n the process card. Complete drawi
ng of parts a
nd bla
nks. After a
nalysis, it is decided to desig
n the special fixture for 8 holes drilli
ng machi
ne o
n the bottom of the drill, determi
ne the positio
ni
ng a
nd clampi
ng scheme, select the positio
ni
ng a
nd clampi
ng compo
ne
nts, a
nd desig
n the fixture body. Keywords: machi
ne tool gearbox, process specificatio
n, fixture, drilli
ng bottom 8 holes 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2 第2章零件的工艺性分析3 2.1零件的结构工艺性分析概述3 2.2零件的组成表面、技术要求及形位公差分析3 2.2.1零件的组成表面分析3 2.2.2零件的技术要求分析3 2.2.3零件的形位公差分析4 2.3零件的作用4 2.4零件材料的确定4 2.5确定零件的生产类型5 2.6确定零件的毛坯类型5 第3章拟定零件工艺路线7 3.1选择定位基准7 3.2确定各表面的加工方案7 3.3工艺路线的选择、比较与确定8 3.4确定机床、夹具、刀具及量具9 3.5确定零件加工余量10 3.6计算切削用量及时间定额13 第4章钻孔专用夹具的设计33 4.1选择定位方案和定位元件33 4.1.1选择定位方案33 4.1.2选择定位元件33 4.2选择夹紧方案和夹紧元件34 4.2.1选择夹紧方案34 4.2.2选择夹紧元件34 4.3夹具体的设计34 4.4选择导向装置—钻套34 4.5计算钻削力35 4.6计算夹紧力35 4.7分析定位误差35 结论36 致谢37 参考文献38