CA6140车床831006拨叉的加工工艺及钻φ25孔夹具设计含4张CAD图-版本2+说明书

A夹具装配图

摘要
本设计是车床拨叉零件的加工工艺及专用夹具设计。从零件的结构外型分析，它的外型复杂，且不易加工，因此该零件选用是铸造件。它的主要加工面是孔、拨叉叉口两端面和槽，在加工中由于面的加工精度要比孔的加工精度容易保证。因此，在设计中采用先面后孔的原则，并将孔与平面的加工划分为粗加工和精加工阶段，以保证加工精度。在本设计中，先以一个面加工出一个基准面，然后，再以该基准面加工相应的孔。在后面的工序中，均以该孔为定位基准，加工拨叉叉口两端面、孔、底平面、槽和斜平面，在整个加工过程中，分别采用了铣床、钻床和镗床。并设计了铣侧面、镗孔和铣槽等的专用夹具，并对它们的定位都采用了一面两销定位。由于该零件的尺寸不大，所需的夹紧力不大。因此，夹紧方式都采用手动夹紧，它的夹紧简单，机构的设计更为方便，满足夹紧要求。
关键词拨叉零件，加工工艺，专用夹具，定位，夹紧
ABSTRACT
This design is a lather plectrum parts processing and special fixture designs. Parts from the appearance of the structure, its appearance complex and difficult process, so the selection of parts is casting.The parts are cast parts. In the processing, it is easier to ensure the processing accuracy of plane than the hole. So the parts’ main planes are hole, two blades of the Plectrum and groove. Therefore, in the design, it adopts the principle of plane first and hole second and divides the hole and plane’s working into extensive and intensive processing stages so as to ensure the accuracy. In this design, firstly, it uses the plane to work a datum; secondly, it uses the datum to work according hole. And in the latter process of working, it also takes hole as the poisoning base and works the two bales of Plectrum, hole, bottom plane, groove and inclined plane. In the entire machining process, it uses separately the milling machine, driller and boring machine. And the design aspect of milling, boring and milling ducts special fixture. They also have adopted the positioning of a two marketing positioning. According to the requirement, it designs the special fixture. For the size of parts is not very big, it doesn’t require strong clamping force. Therefore, methods of clamping are manual clamping; that is because it is simple and the design is more convenient to meet the requirements of clamping.

Keywords Plectrum Parts, Processing, Special Fixture, Positioning, Clamping

目录
摘要I
ABSTRACT II
1绪论1
2零件的分析2
2.1零件的作用2
2.2拨叉831006的工艺分析2
2.3拨叉831006的工艺2
2.3.1加工要求2
2.3.2平面的加工3
2.3.3大头孔的加工3
2.3.4小头孔的加工3
2.4本章小结3
3工艺规程设计5
3.1确定毛坯的制造形式5
3.2加工工艺过程5
3.3基面的选择5
3.3.1粗基准的选择5
3.3.2精基准的选择6
3.4工艺路线的拟订6
3.4.1确定工序的原则6
3.4.2工序的特点7
3.4.3加工精度的划分8
3.4.4制定工艺路线8
3.5本章小结10
4工序参数选择、计算11
4.1毛坯的确定11
4.1.1毛坯的工艺要求11
4.1.2毛坯形状、尺寸要求11
4.2拨叉831006的偏差计算12
4.2.1拨叉平面的偏差及加工余量计算12
4.2.2大小头孔的偏差及加工余量计算13
4.2.3粗、精铣槽14
4.3确定切削用量及基本工时（机动时间） 14
4.3.1工序1：粗、精铣孔上平面14
4.3.2工序2：加工孔到要求尺寸16
4.3.4工序4粗、精镗孔21
4.3.5工序5：粗、精铣下平面22
4.3.6工序6：粗、精铣槽24
4.3.7工序7粗铣斜平面25
4.3.8工序8铣断26
4.4时间定额计算及生产安排27
4.4.1粗、精铣孔上平面27
4.4.2钻、扩、铰孔27
4.4.3粗、精铣两侧面28
4.4.4粗、精镗孔28
4.4.5粗、精铣下平面29
4.4.6粗、精铣槽29
4.4.7粗铣斜平面29
4.4.8铣断29
4.5本章小结30
5钻φ25孔夹具设计31
5.1问题的提出31
5.2定位基准的选择31
5.3切削力和卡紧力计算31
5.4定位误差分析31
5.5卡具设计及操作的简要说明31
结论32
参考文献33
致谢34

零件图

三维零件图

夹具设计部分

设计所包含文件

字数统计

夹具体

毛坯图

工序1

工序2

工序3

工序4

工序5

工序6

工序7

工序8

过程卡