机械5

摘要 专用夹具历经岁月，仍然经久不衰，其主要原因是不规则零件的存在并且越来越多，零件的尺寸要求和公差要求也是越来越高。要想很好很快的加工零件的尺寸，并且保证零件的各项加工要求以及测量精度，专用夹具就是很好的选择。 本次毕设研究的对象是齿轮拨叉，该零件结构并不是很复杂，当形状畸形是典型的叉架类零件，该零件的作用是拨动滑动齿轮，使其和相应的齿轮进行传动，实现预期的转动速度或者转动方向等，该零件是实现转速或者转向过程中的操作零件。 本次毕设研究的主要内容是齿轮拨叉加工工艺设计，钻孔专用夹具设计。加工工艺的设计，其主要的内容有：分析工件作用、分析工件结构、分析加工面加工精度、确定进给量还有背吃刀量，计算切削速度以及加工时间等等。 通过结合任务书以及对零件图的分析，决定设计钻M10螺纹孔Z3025钻床专用夹具。其设计内容有：设计定位、夹紧方案，选择定位、夹紧元件；选择标准钻套；设计夹具体等。 关键词：齿轮拨叉；加工工艺；专用夹具；M10螺纹孔；Z3025 Abstract Special fixtures have bee
n arou
nd for a lo
ng time, a
nd the mai
n reaso
n is the existe
nce a
nd i
ncreasi
ng
number of irregular parts. The dime
nsio
nal requireme
nts a
nd tolera
nce requireme
nts of parts are also i
ncreasi
ng. Special fixtures are a good choice for thevery fast a
nd easy processi
ng of part sizes a
nd thevarious machi
ni
ng requireme
nts a
nd measureme
nt accuracy of the parts. The object of this research is the gear shifti
ng fork. The structure of the part is
notvery complicated. Whe
n the shape is deformed, it is a typical fork-like part. The fu
nctio
n of the part is to move the slidi
ng gear to drive itwith the correspo
ndi
ng gear. To achieve the desired rotatio
nal speed or directio
n of rotatio
n, etc., this part is the operati
ng part that realizes the speed or steeri
ng process. The mai
n co
nte
nt of this research is the gear shifti
ng process desig
n a
nd drilli
ng special fixture desig
n. The mai
n co
nte
nts of the desig
n of the processi
ng tech
nology are: a
nalyzi
ng the actio
n of theworkpiece, a
nalyzi
ng the structure of theworkpiece, a
nalyzi
ng the machi
ni
ng accuracy of the machi
ni
ng surface, determi
ni
ng the feed amou
nt a
nd the amou
nt of the back-feedi
ng k
nife, calculati
ng the cutti
ng speed a
nd the machi
ni
ng time, a
nd so o
n. By combi
ni
ng the task book a
nd the a
nalysis of the part drawi
ng, it is decided to desig
n the special fixture for drilli
ng the M10 threaded hole Z3025. The desig
n co
nte
nts i
nclude: desig
n positio
ni
ng, clampi
ng scheme, selectio
n of positio
ni
ng, clampi
ng compo
ne
nts; selectio
n of sta
ndard drill sleeves; desig
n clips a
nd so o
n. Keywords: gear shift fork; machi
ni
ng process; special fixture; M10 threaded hole; Z3025 目录 摘要I Abstract II 第一章绪论1 1.1机床夹具的分类及概述1 1.2机床夹具的发展及趋势2 第二章齿轮拨叉机械加工工艺规程设计3 2.1零件的工艺分析及生产类型的确定3 2.1.1零件的作用3 2.1.2零件的工艺分析3 2.1.3零件生产类型的确定4 2.2零件工艺规程设计5 2.2.1零件制造形式及毛坯的确定5 2.2.2基准的选择5 2.3选择、比较和确定加工工艺路线6 2.3.1选择加工工艺路线6 2.3.2比较加工工艺路线7 2.3.3确定加工工艺路线7 2.4加工设备、装夹夹具、加工刀具及测量量具的确定7 2.5机械加工余量的确定8 2.6确定切削用量及基本工时10 第三章钻床专用夹具的设计23 3.1问题的提出23 3.2夹具设计23 3.2.1确定定位方案，选择定位元件23 3.2.2确定夹紧方案，选择夹紧元件24 3.2.3夹具体的设计24 3.2.4钻套的选择24 3.2.5钻削力及夹紧力计算24 3.2.6定位误差分析25 结论26 致谢27 参考文献28