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CA6140车床831006拨叉的铣16槽专用夹具设计及加工工艺装备含非标9张CAD图-版本1+说明书

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夹具设计部分

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。并设计了铣槽的专用夹具，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 the processing technology and special fixture design of lathe fork parts. According to the analysis of the structural shape of the part, its shape is complex, and it is not easy to process, so the part is cast. Its main machining surface is the two end faces and grooves of the hole and the fork. In the machining process, the machining accuracy of the surface is easier to guarantee than that of the hole. Therefore, the principle of "face before hole" is adopted in the design, and the machining of hole and plane is divided into rough machining and finish machining to ensure the machining accuracy. In this design, a datum plane is machined first, and then the corresponding holes are machined with the datum plane. In the later process, the hole is used as the positioning reference to process the two end faces, holes, bottom planes, grooves and inclined planes of the fork. In the whole process, milling machine, drilling machine and boring machine are used respectively. And designed a special fixture for milling groove, and used one side and two pins for their positioning. Due to the small size of the part, the required clamping force is not large. Therefore, manual clamping is adopted in the clamping mode, which is simple in clamping, more convenient in mechanism design and meets the clamping requirements.
Key words：shift fork parts, processing technology, 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铣槽夹具设计31
5.1定位基准的选择31
5.2制定夹具方案31
5.3定位元件的选择及计算33
5.4定位误差分析34
5.5铣削力与夹紧力计算35
5.6定向键与对刀装置选择36
5.7本章小结38
结论39
参考文献40
致谢41