用查表法确定下列各配合的孔、轴的极限偏差,计算极限间隙或过盈、平均间隙或过盈、配合公差并判断基
单位均为mm
(1)查表得 φ50K7=φ50K7(-0.018+0.007) φ50h6=φ50h6(-0.0160)
Xmax=ES—ei=+0.007一(一0.016)=+0.023
Ymax=EI—es=一0.018一0=一0.018
Xav=
单位均为mm(1)查表得φ50K7=φ50K7(-0.018+0.007)φ50h6=φ50h6(-0.0160)Xmax=ES—ei=+0.007一(一0.016)=+0.023Ymax=EI—es=一0.018一0=一0.018Xav==+0.0025Tf=Xmax一Ymax=+0.023一(一0.018)=0.041该配合是基轴制的过渡配合。公差带图如图3-1a所示。(2)查表得φ30H8=φ30H8(0+0.033)φ30ff=φ307/(-0.041+0.020)Xmax=ES—ei=+0.033一(一0.041)=+0.074Xmax=EI—es=0一(一0.020)=+0.020Xav==+0.047Tf=Xmax一Xmin=+0.074一0.020=0.054该配合是基孔制的间隙配合。公差带图如图3一1b所示。(3)查表得φ140H7=φ140H7(0+0.040)φ140s6=φ140s6(+0.092+0.117)Ymin=ES—ei=+0.040一0.092=一0.052Ymax=EI—es=0—0.117=一0.117Yav==0.0845Tf=Ymin一Ymax=一0.052一(一0.117)=0.065该配合是基孔制的过盈配合。公差带图如图3-1c所示。