机械5

摘要 本次设计是对拔叉零件的加工工艺规程及一些工序的专用夹具设计。此拔叉零件的结构简单，其加工的地方主要是拔叉脚的两端面、拔叉脚内表面和拔叉轴孔以及侧孔。本设计将孔与平面的加工明确划分成精加工和粗加工阶段以保证它们的加工精度。主要加工工序是粗铣拔叉头上下表面，钻Φ 15叉轴孔，铣拔叉脚两端面，铣拔叉脚内表面和钻Φ 5侧孔。整个加工过程的机床选用了钻床和铣床。工件在机床上定位夹紧选用专用夹具，夹紧方式为手动夹紧，夹紧可靠，操作方便。因此生产效率较高，适用于大批量、流水线上加工。能够满足设计要求。 关键词：拨叉工艺规程机床夹具 Abstract This desig
n is to the shifti
ng fork parts of the processi
ng tech
nology a
nd some of the special fixture desig
n process.The structure of the shifti
ng fork is simple, a
nd the processi
ng place is mai
nly the two e
nd faces of the shifti
ng fork, the i
n
ner surface of the shifti
ng fork, the shaft hole a
nd the side hole. The desig
n clearly divides the machi
ni
ng of hole a
nd pla
ne i
nto f i
nishi
ng a
nd rough machi
ni
ng s t ages to e
nsure their machi
ni
ng accuracy. Mai
n processi
ng process is rough milli
ng the top a
nd bottom surface of shifti
ng fork head, drillΦ 15 the shifti
ng fork shaft hole, milli
ng the two e
nd faces of theshifti
ng fork foot, milli
ng the i
n
ner surface of the shifti
ng fork foot a
nd drill aΦ 5 hole o
n the side of the shifti
ng fork. Drilli
ng machi
ne a
nd milli
ng machi
ne are used for thewhole process. Theworkpiece is positio
ned a
nd clamped o
n the machi
newith special fixture, the clampi
ngway is ma
nual clampi
ng, reliable clampi
ng a
nd co
nve
nie
nt operatio
n. Therefore, it has high prod uctio
n efficie
ncy a
nd is suitable for mass productio
n a
nd asse mbly l i
ne processi
ng. Ca
n meet the desig
n requireme
nts. Keywords: shifti
ng fork process pla
n
ni
ng machi
ne tool fixture 目录 任务书..........................................Ⅰ 摘要............................................Ⅱ Abstract.........................................Ⅲ 1.零件的分析..................................... 1 1.1零件的用途.................................... 1 1.2零件的工艺分析............................. 1 1.3零件的工艺分析............................. 3 2.工艺规程设计................................... 3 2.1确定毛坯类型绘制毛坯简图.................. 3 2.1.1选择毛坯............................. 3 2.1.2确定毛坯的外形、尺寸公差和机械加工余量4 2.2拟定拔叉工艺路线.......................... 5 2.2.1定位基准的选择....................... 5 2.2.2表面加工方法的确定................... 6 2.2.3加工阶段的划分....................... 6 2.2.4工序的集中与分散..................... 7 2.2.5工艺方案比选......................... 7 2.2.6工序顺序的安排....................... 8 2.2.7确定工艺路线......................... 9 2.3机床设备、工装的选用.................. 10 2.4机械加工工序设计......................... 11 2.4.1工序简图的绘制...................... 11 2.4.2加工余量、工序尺寸和公差的确定...... 12 2.4.3切削用量的选择...................... 14 3专用夹具设计................................... 18 3.1夹具设计任务.............................. 18 3.1.1专用夹具设计的基本要求.............. 18 3.1.2专用夹具设计的一般步骤和需要完成的任务 ......................................... 18 3.2拔叉零件专用铣床夹具设计.................. 20 3.2.1夹具设计任务........................ 20 3.2.2确定夹具的结构方案.................. 20 3.2.3夹具设计........................... 20 参考文献........................................ 24