扇形板加工工艺夹具设计机械制造基础课程设计_扇形板

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目录
目录........................................................................................................................... 1
1 绪论...................................................................................................................... 1
2 扇形板的分析.................................................................................................... 2
2.1 扇形板的工艺分析....................................................................................... 2
3 选择毛坯的制造方式，初确定毛坯形状.............................................................. 3
4 工艺规程设计......................................................................................................4
4.1 加工工艺过程.............................................................................................. 4
4.2 确定各表面加工方案....................................................................................4
4.2.1 影响加工方法的因素.......................................................................... 5
4.2.2 加工方案的选择..................................................................................5
4.3 确定定位基准.............................................................................................. 5
4.3.1 粗基准的选择..................................................................................... 5
4.3.2 粗基准的选择····························································································6
4.4 工艺路线的拟订··································································································7
4.4.1 工序的合理组合···························································································7
4.4.2 工序的集中与分散..............................................................................7
4.4.3 加工阶段的划分..................................................................................8
4.4.4 加工工艺路线方案的比较.................................................................. 9
4.5 扇形板的偏差，加工余量，工序尺寸及毛坯尺寸的确定........................ 10
4.5.1 毛坯的结构工艺要求........................................................................ 10
4.5.2 扇形板的偏差计算............................................................................10
4.6 选择机床及对应夹具、量具、刃具·································································11
4.7 确定切削用量、时间定额····················································································13
5 夹具设计···························································································································22
5.1 研究原始质料............................................................................................. 22
5.2 定位基准的选择......................................................................................... 23
5.3 钻削力及夹紧力的计算..............................................................................23
5.4 误差分析与计算......................................................................................... 24
5.5 夹具设计及操作的简要说明...................................................................... 25
6 参考文献.............................................................................................................. 26
3
2.扇形板的分析
2.1 扇形板的工艺分析
扇形板是-个很重要的零件，因为其零件尺寸比较小，结构形状较复杂，但
其加工孔和表面的精度要求较高，上下表面、圆弧表面都有粗糙度要求，精度要
求较高，此外还有φ22

0
0.021
孔要求加工，对精度要求也很高∽粗糙度要求都
是Ra1.6，所以都要求精加工。其小头孔与下平面有平行度的公差要求，和
φ22

0
0.021
孔有对称度公差要求，因为其尺寸精度、几何形状精度和相互位置精
度，以及各表面的表面质量均影响机器或部件的装配质量，进而影响其性能与工
作寿命，因此它们的加工是非常关键和重要的。
2.2 扇形板的工艺要求
-个好的结构不但要应该达到设计要求，而且要有好的机械加工工艺性，也
就是要有加工的可能性，要便于加工，要能够保证加工质量，同时使加工的劳动
量最校而设计和工艺是密切相关的，又是相辅相成的。设计者要考虑加工工艺
问题。工艺师要考虑如何从工艺上保证设计的要求。