机械5

摘要 本设计是CA6140床头I轴轴承座零件的加工工艺规程及一些工序的专用夹具设计。CA6140I轴轴承座零件的主要加工表面是平面及孔。一般来说，保证平面的加工精度要比保证孔的加工精度容易。因此，本设计遵循先面后孔的原则。并将孔与平面的加工明确划分成粗加工和精加工阶段以保证孔的加工精度。基准的选择以I轴轴承座外圆面作为粗基准。先将底面加工出来，然后作为定位基准，在以底面作为精基准加工孔。整个加工过程选用数控机床。在夹具方面选用专用夹具。考虑到零件的结构尺寸简单，夹紧方式多采用手动夹紧，夹紧简单，机构设计简单，且能满足设计要求。 关键词加工工艺，夹具，定位，夹紧 Abstract This paper is to desig
n the craft processes of maki
ng the CA6140 lever spare parts a
nd some specialized to
ngs i
n the process. The CA6140 lever spare part primarily processes the surface a
nd bores. Ge
nerally speaki
ng, to guara
ntee the accuracy of the flat surface process is easier tha
n that of the bore. Therefore, this desig
n follows the pri
nciple that surface first a
nd the
n the bore, a
nd defi
nitely divides the process of flat surface a
nd bore i
nto coarse processes a
nd precise processes to guara
ntee the bore processes. The basic choice is to co
nsider 45 outside circle as rough basis a
nd to co
nsider 25 bore a
nd its
next surface as precise basis. The bottom is first processed out to be fixed positio
n basis, a
nd process the bore usi
ng the bottom as the precise basis. The whole processes choose the machi
ne bed. I
n the aspects of to
ngs choosi
ng, specialized to
ngs are used. I
n co
nsideratio
n of the simple co
nstructio
n size of the spare parts, clippi
ng by ha
nds is adopted. It is simple, a
nd the orga
nizatio
n desig
n is simple, a
nd ca
n satisfy the desig
n request. Key Words craft proces , to
ngs, fixed positio
n, tight clip 目录 摘要Ⅰ Abstract Ⅱ 1绪论1 1.1课题背景1 1.2夹具的发展史1 1.3小结2 2 I轴轴承座加工工艺规程设计3 2.1零件的分析3 2.1.1零件的作用3 2.1.2零件的工艺分析3 2.2确定生产类型3 2.3确定毛坯4 2.3.1确定毛坯种类4 2.3.2确定铸件加工余量及形状4 2.3.3绘制铸件零件图4 2.4工艺规程设计4 2.4.1选择定位基准4 2.4.2制定工艺路线5 2.4.3选择加工设备和工艺设备8 2.4.4机械加工余量、工序尺寸及公差的确定9 2.5确定切削用量及基本工时11 2.5.1工序1：车肩胛面成型11 2.5.2工序2：钻,扩φ75中孔,车端面，倒角12 2.5.3工序3：挖环槽16 2.5.4工序4：钻Φ１４及3-Φ9的通孔17 2.5.5工序5：攻M10×1.5的螺纹20 2.5.6工序6：铣B,D,C三平面21 2.5.7工序7：钻Φ10的孔22 2.5.8工序8：钻Φ5短斜孔24 2.5.9工序9：钻Φ5长斜孔27 2.5.10工序10：粗镗Φ90的孔29 2.5.11工序11：精镗孔Φ90 30 2.6本章小结32 3专用夹具设计33 3.1钻φ5长斜孔夹具设计说明书33 3.1问题的提出33 3.2夹具的设计33 3.3本章小结40 4钻φ5长斜孔刀具设计说明书41 4.1刀具类型的确定41 4.2刀具设计参数的确定41 4.3刀具工作草图的确定41 5钻φ5长斜孔量具设计说明书42 5.1量具类型的确定42 5.2极限量具尺寸公差的确定42 5.3极限量具尺寸公差图的确定42 5.4极限量具结构设计43 结论44 参考文献45 致谢46