机械制图课件第八章技术要求.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,120,2.5,x45,1.标注表面粗糙度,表面粗糙度、尺寸公差、形位公差,38页,(1)标注下图所示零件的表面粗糙度值。圆柱,面取,；,倒角、锥面取,；,各平面取,1.6,3.2,6.3,6.3,3.2,3.2,1.6,1.6,1.6,圆柱面,1.6,6.3,倒角、锥面取,各平面取,3.2,1.(2),3.2,6.3,表面粗糙度、尺寸公差、形位公差,38页,1）,A,面,Ra,最大允许值为,12.5,m;,2）孔,表面,Ra,最大允许,值为3.2,m;,3）,B,面,Ra,最大允许值为,12.5,m;,4）其余表面均不进行切,削加工,Ra,最大允许值,为50,m.,B,(2)将指定的表面粗糙度用代号标注在图上,。,A,A,12.5,3.2,12.5,50,12.5,12.5,3.2,3.2,12.5,其余,50,写在图纸的右上角，并大一号,2.,轴和孔的直径,公差代号和偏差值。,表面粗糙度、尺寸公差、形位公差,38页,25,k6,(1)根据配合代号，在零件图上分别标出,2.标注尺寸公差,52,K7,解：,根据,25,k,6,查表,（附表29 433页）,得：,+15,+2,写成,25,k,6（）,+,0.015,+0.002,25,k,6,（）,+,0.015,+0.002,根据,52,K,7,查表,（附表30 434页）,得：,+9,-21,写成,52,K,7（）,+,0.009,-0.021,（改,J,为,K）,52,K,7（）,+,0.009,-0.021,2.（2）,表面粗糙度、尺寸公差、形位公差,38页,2.标注尺寸公差,(2)根据轴和孔的偏差值，在装配图上标出其配合代号。,+0.021,20,0,+0.018,32,+,0.002,+0.039,32,0,-0.020,20,-,0.041,解：查表30（434页）,+0.021,20,0,20,H7,+0.039,32,0,32,H8,查表29（433页）,20,f7,32,k6,-0.020,20,-,0.041,32,+,0.002,+0.018,改,32,+,0.002,+0.027,32,+,0.002,+0.018,H7,20,f7,H8,32,k6,写成,：,H7,20,f7,H8,32,k6,标注在图中,2.（3）,表面粗糙度、尺寸公差、形位公差,38页,2.标注尺寸公差,1)轴套与轴的配合采用基,制,孔与轴是 配合。,2)轴套与轮的配合采用基,制,孔与轴是 配合。,3)查表并写出各偏差值：,14,F8,14,h7,18,H7,18,p6,14,F8/h7,18,H7/p6,(3)回答问题,：,轴,轴套,轮,轴,间隙,查246页,孔,过盈,查245页,+,0.043,+0.016,434页,0,-0.018,433页,+,0.018,0,434页,+0.029,+0.018,433页,3.,表面粗糙度、尺寸公差、形位公差,38页,3.将文字说明的形位公差标注在图上。,1)孔,轴线,直线度,不大于,0.012,mm,2)孔,圆度,不大于,0.005,mm,3)底面,平面度,不大于0.01,mm,4)孔,轴线对底面,平行度,不,大于0.03,mm,0.012,0.005,0.01,A,0.012,0.005,0.01,对齐尺寸箭头,完,0.03,A,0.03,A,