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1、实验二 一面两空定位铣削侧面的加工位置精度分析实验数据序号孔径d1孔径d2LL2L3aa角度L2L3aa角度125.925.25013200.1390959417.96961039418220.0798299864.57392126223.9245022240.0399786872.29061004316330.32773850718.77803322323.5245012110.0199973341.14576283835380.0599281553.433630362422.4225019150.0798299864.5739212624430.3631470120.80679101523
2、.424507140.1390959417.96961039425400.29145679416.69924423622.522.250400.0798299864.5739212620220.0399786872.290610043723.924.25022180.0798299864.5739212627420.29145679416.69924423823.8245013110.0399786872.29061004343320.21655030512.40741853923.224.25020170.0599281553.43363036233300.0599281553.433630
3、3621022.323501790.1586552629.09027692125370.23554498113.495733281123.221.75019390.38050637721.8014094923350.23554498113.49573328122424.150710.1194289266.84277341318300.23554498113.495733281323.124.2501200.23554498113.4957332817370.38050637721.801409491421.323.250330025230.0399786872.2906100431524.22
4、2.95010120.0399786872.29061004330340.0798299864.573921261624.424.1503150.23554498113.4957332828300.0399786872.290610043172424.35021320.21655030512.4074185321340.25436805914.57421621823.121.25028150.25436805914.574216219300.21655030512.40741853192223.45021410.38050637721.8014094927410.27300870315.642
5、246462024.323.85025420.32773850718.7780332229370.1586552629.0902769212124.4245037380.0199973341.1457628382323002221.321.95041430.0399786872.29061004324150.17809293810.203973722324.123.45024210.0599281553.43363036216170.0199973341.1457628382424.624.1501919001616002541.340.85020180.0399786872.29061004
6、337380.0199973341.145762838a平均值0.1274508017.302393a平均值0.163904529.391037257一圆柱销一菱形销定位：定位元件尺寸分别为10.000mm,9.995mm；双圆柱销定位：定位元件尺寸分别为9.865mm,10.000mm。双圆柱销定位产生的角向误差受工件位置、形状、尺寸误差，夹具制造误差，夹具设计误差（即定位元件与定位孔之间的保证间隙）等因素的影响，而一圆柱销一菱形销定位中销起到了消除沿孔连轴线方向过定位的影响，即补偿了工件及夹具相互位置误差。这样，用一菱形销取代其中一个圆柱销能避免过定位造成的工件倾斜，同时能使定位销直径在x方向上不必因补偿中心距公差而过分缩小。分析测量数据，用一圆柱销一菱形销定位时定位元件尺寸可以设计的较大，以减小工件与夹具之间的间隙误差，而用双圆柱销定位时，应尽量避免工件倾斜（转动），可以将圆柱销尺寸设计的较前者大。另一方面，工件的尺寸误差也是造成角向误差的一个原因。工件尺寸对角向误差影响如下图
