大径牙距牙型公差等级T/Z理论大径MaxMin大径实测值3/824UNF2BT9.53779.53779.5250非标大径参考下表标准大径11.85422.18432.51542.84553.17563.50584.166104.826125.486超出公差理论中径MaxMin磨损极限中径实测值超出公差8.85298.85298.84528.8376M值三针径常数P(理论)PS(理论)D(理论)TD2TPLZPLEIWGOWNGO0.610.9141.0581.0580.91380.611#NUM!#NUM!#NUM!#NUM!T1B#NUM!#NUM!螺纹:3/8-24大径中径小径9.5258.83768.3794(输入)尺寸偏差尺寸TD0+Ta-TaD2+ZPL+TPL/29.5377-0.01278.8529ZD2+TD2+3^(1/2)*P/4(1)-TaD2+TD29.4215-0.01278.9632尺寸=偏差尺寸Td20+es-2TR8.8224Zd20+es-Td2-TR/28.7082尺寸偏差尺寸TTD0+es+TC-TCD20+es-2TR-E+Tcp9.5380-0.01308.8184TZd20+es-TR+P/5+Tcp/2+Tc-TCd20+es-TR+Tcp/29.0567-0.01308.8320TSd2+es-TR+P/5+E+TC-TCd20+es-TR+E(2)9.0627-0.01308.8380ZTd0+es+TC(3)-TCd20+es-Td2-TR/2-S+Tcp(4)9.5380-0.01308.7072ZZd0+es-Td2+TC-TCd20+es-Td2+(TR+Tcp)/29.4124-0.01308.7178ZSd0+es-Td2+TC-TCd2+es-TD2+S+TCP(5)9.4124-0.01308.7210计算直径D0,对于UNC,UNF,4UN,6UN,8UN,和1-14UNS,D0=D,=D0+es9.5250=D0+es9.5250螺纹环规尺寸计算公式塞规代号大径中径螺纹塞规尺寸计算公式塞规代号大径中径校对螺纹塞规计算公式塞规代号大径中径(1).dMAXD0-0.0325P时,dMAX=D0-0.0325P(2).d1MAXD20+TD2-TPL-3^(1/2)*P/2+0.087时.必须切丝底槽,最大切槽宽度P/4,如切槽困难则取(D20-3^(1/2)*P/4)和(D20+TD2-TPL-UNF-2B标准牙距11.8541.058322.18432.51542.84553.175小径63.505偏差磨损偏差=84.166-TPL-2TPLD2-P/3^(1/2)104.826-0.0076-0.01528.2266125.486-TPLD2-P/3^(1/2)-0.00768.2266偏差磨损偏差尺寸偏差+TR+2TRd20+es-Ta-(3^(1/2)*P)/4+Ta0.00760.01538.36660.0127+TRd20+es-Td2-(3^1/2*P)/8(1)+Ta0.00768.48290.0127小径偏差磨损偏差=-Tcpd20+es-2TR-P/3^1/2-0.00408.2113-Tcpd2+es-TR-P/3^(1/2)-0.00408.2190-TCPd2+es-TR-P/3^(1/2)-0.00408.2190-TCPd2+es-TD2-P/3^(1/2)-0.00408.1010-TCPd2+es-TD2-P/3^(1/2)-0.00408.1010-TCPd2+es-TD2-P/3^(1/2)-0.00408.1010计算直径D0,对于UNC,UNF,4UN,6UN,8UN,和1-14UNS,D0=D,螺纹环规尺寸计算公式中径小径螺纹塞规尺寸计算公式中径校对螺纹塞规计算公式中径(1).dMAXD0-0.0325P时,dMAX=D0-0.0325P(2).d1MAXD20+TD2-TPL-3^(1/2)*P/2+0.087时.必须切丝底槽,最大切槽宽度P/4,如切槽困难则取(D20-3^(1/2)*P/4)和(D20+TD2-TPL-螺纹:-UNF-2BN(参考)大径中径小径牙距牙D0=4D04Ta(参考)D01.5~4D04~880,7256~3632~1816~108,75,4.5结果:Ta:结果:(UM)N牙D0=1/2(1)D01/2~4D04TC(参考)D0=1/2D01/2~1.5D01.5~4D04~8TCP(参考)ES80,7256,48,4440,36(2)32,28,2724,2014,1312,11.59,85,4.5结果:Tc:结果:Tcp:E结果:S结果:注:上面数据来自{美(中径公差计算)}(不要输入)(1),公螺纹塞规和环规公差D0=1.5顶径公差Ta中径公差TPL=TRTPL=TR(参考)下移量校对螺纹塞规公差带的位置要素TPL=TR:中径公差TCP大径公差TC公称直径大于至D0中径公差英制结果:(自算)TD2=公称直径大于(自算)至(自算)(公制)D0结果:外螺纹的1A和2A的基本偏差es为2A中径公差T2=TD2的(-0.3)倍即:公称直径大于es=-0.0045((D0^1/3+Le^1/2)/10+1/((N^2)^1/3))至es:D0结果:结果:外螺纹等级C内螺纹等级1A1B2A2B3A3B结果:结果:计算直计算直径D0第一组:DO第三组:DO第二组:DO螺纹第四组:DO精度系数CC内螺纹等级的精度系数是同等级的外螺纹相应系数的1.3倍TD2=Cx0.015((D0^1/3+Le^1/2)/10+1/(N^2)^1/3)式中:D0-计算直径C-精度系数Le-螺纹旋合长度