ICS25.100.50J41JB/T8824.7-1998统一螺纹滚丝轮Threadrollingcylindricaldiesforunifiedthreads1998-12-29发布1999-07-01实施国家机械工业局发布前言本标准于1998年12月29日首次发布。本标准由全国刀具标准化技术委员会提出并归口。本标准主要起草单位:上海标准件工具厂、上海刃具厂。JB/T8824.7-199811范围本标准规定了统一螺纹滚丝轮(以下简称滚丝轮)的型式和尺寸、技术要求、标志和包装的基本要求。本标准适用于加工统一螺纹(ANSIB1.1—82)的滚丝轮。滚丝轮分两种精度等级:1级和2级。1级适用于加工公差等级3A级和2A级的外螺纹。2级适用于加工公差等级2A级和1A级的外螺纹。2引用标准下列标准所包含的条文,通过在本标准中引用而构成为本标准的条文。本标准出版时,所示版本均为有效。所有标准都会被修订,使用本标准的各方应探讨使用下列标准最新版本的可能性。ANSIB1.1—82统一制螺纹3型式和尺寸3.1滚丝轮的型式在图1和表1中给出。图1注:图1中滚丝轮分带凸台和不带凸台两种,由制造厂自定。国家机械工业局1998-12-29批准中华人民共和国机械行业标准统一螺纹滚丝轮ThreadrollingcylindricaldiesforunifiedthreadsJB/T8824.7-19981999-07-01实施JB/T8824.7-19982表1键槽型式内孔Dbh45型45025.00+47.962.00+54型54030.00+1236.012.0++57.574.00+75型75030.00+2042.012.0++79.374.00+3.245型滚丝轮的基本尺寸在表1、表2、表3中给出。表2倒角螺纹代号每25.4mm上牙数公称直径dmm螺距Pmm滚丝轮螺纹头数Z中径d2mm宽度LmmΚrfmmNo.8–32UNC324.1650.79440145.0801.2No.10–24UNC244.8261.05835143.9201.61/4–20UNC206.3501.27026142.8962.05/16–18UNC187.9381.41120139.8003/8–16UNC169.5251.58817143.8202.37/16–14UNC1411.1121.81414138.57240,501/2–13UNC1312.7001.95412136.7042.89/16–12UNC1214.2872.11711141.6035/8–11UNC1115.8752.30910143.3503.43/4–10UNC1019.0502.5408138.82450,60,7025°3.8表3倒角螺纹代号每25.4mm上牙数公称直径dmm螺距Pmm滚丝轮螺纹头数Z中径d2mm宽度LmmΚrfmmNo.10–32UNF324.8260.79432137.2161.2No.12–28UNF5.48630146.1601/4–28UNF286.3500.90725143.3751.45/16–24UNF7.93820144.4203/8–24UNF249.5251.05816140.9281.67/16–20UNF11.11214143.55640,501/2–20UNF2012.7001.27012142.0922.09/16–18UNF14.28710133.3505/8–18UNF1815.8751.4119134.2983/4–16UNF1619.0501.5888143.84050,60,7025°2.3JB/T8824.7-19983注1表2、表3中的Κr、f为推荐尺寸。2使用厂因特殊需要,不能采用表中规定的滚丝轮宽度时,可按下列宽度系列另行选取:30,40,45,50,55,60,65,70,75,80,85,90,95,100,105。3按使用厂需要制造具有备磨量的滚丝轮。3.354型滚丝轮的基本尺寸在表1、表4、表5中给出。表4倒角螺纹代号每25.4mm上牙数公称直径dmm螺距Pmm滚丝轮螺纹头数Z中径d2mm宽度LmmΚrfmm1/4–20UNC206.3501.27026142.8962.05/16–18UNC187.9381.41120139.8003/8–16UNC169.5251.58817143.8202.37/16–14UNC1411.1121.81414138.57240,501/2–13UNC1312.7001.95412136.7042.89/16–12UNC1214.2882.11711141.6035/8–11UNC1115.8752.30910143.3503.43/4–10UNC1019.0502.5408138.82450,60,707/8–9UNC922.2252.8227142.3943.81–8UNC825.4003.1756139.71670,80,9025°4.5表5倒角螺纹代号每25.4mm上牙数公称直径dmm螺距Pmm滚丝轮螺纹头数Z中径d2mm宽度LmmΚrfmm1/4–28UNF286.3500.90725143.3751.45/16–24UNF7.93820144.4203/8–24UNF249.5251.05816140.9281.67/16–20UNF11.11214143.55640,501/2–20UNF2012.7001.27012142.0922.09/16–18UNF14.28810133.3505/8–18UNF1815.8751.4119134.2983/4–16UNF1619.0501.5888143.84050,60,702.37/8–14UNF1422.2251.8147147.0352.81–12UNF1225.4002.1176143.88070,80,9025°3.4注1表4、表5中的Κr、f为推荐尺寸。2使用厂因特殊需要,不能采用表中规定的滚丝轮宽度时,可按下列宽度系列另行选取:30,40,45,50,55,60,65,70,75,80,85,90,95,100,105。3按使用厂需要制造具有备磨量的滚丝轮。3.475型滚丝轮的基本尺寸在表1、表6、表7中给出。JB/T8824.7-19984表6倒角螺纹代号每25.4mm上牙数公称直径dmm螺距Pmm滚丝轮螺纹头数Z中径d2mm宽度LmmΚrfmm1/2–13UNC1312.7001.95415170.880502.89/16–12UNC1214.2882.11714180.2225/8–11UNC1115.8752.30912172.02060,703.43/4–10UNC1019.0502.54010173.5307/8–9UNC922.2252.8229183.0783.81–8UNC825.4003.1758186.2884.5181–7UNC28.5757183.134141–7UNC731.7503.629176.0225.4183–6UNC34.9256192.678121–6UNC638.1004.2335176.44070,8025°6.3表7倒角螺纹代号每25.4mm上牙数公称直径dmm螺距Pmm滚丝轮螺纹头数Z中径d2mm宽度LmmΚrfmm1/2–20UNF2012.7001.27015177.6152.09/16–18UNF14.28813173.3555/8–18UNF1815.8751.41112181.8723/4–16UNF1619.0501.58810179.8002.37/8–14UNF1422.2251.8149189.04550,602.81–12UNF25.4008191.840181–12UNF28.5757190.085141–12UNF31.7506181.980183–12UNF34.925167.510121–12UNF1238.1002.1175183.38560,7025°3.4注1表6、表7中的Κr、f为推荐尺寸。2使用厂因特殊需要,不能采用表中规定的滚丝轮宽度时,可按下列宽度系列另行选取:30,40,45,50,55,60,65,70,75,80,85,90,95,100,105。3按使用厂需要制造具有备磨量的滚丝轮。3.5滚丝轮螺纹牙型尺寸和偏差在图2和表8中给出,优先采用A型滚丝轮。JB/T8824.7-19985图2表8h1mmh2mmA、B型A型B型每25.4mm上螺距偏差mm牙型半角偏差每25.4mm上牙数螺距Pmm公称尺寸上偏差下偏差公称尺寸上偏差下偏差最小尺寸1级2级1级2级320.7940.230+0.0250.258–0.0160.258±0.015±0.020±30′±40′280.9070.2630.295+0.010–0.0170.295241.0580.3070.344–0.0150.344±25′±35′201.2700.3680.413–0.0170.413181.4110.409+0.0300.459–0.0190.459±0.020±0.030161.5880.4610.516–0.0200.516141.8140.5260.590–0.0230.590±20′±30′131.9540.567+0.0350.635+0.015–0.0250.635±0.025±0.035122.1170.6140.688–0.0260.688112.3090.670+0.0400.750–0.0290.750102.5400.7370.826–0.0310.826±15′±25′92.8220.8180.917–0.0340.91783.1750.921+0.0451.032+0.020–0.0371.03273.6291.0521.1791.17964.2331.228+0.05001.376+0.025–0.0421.376±0.030±0.040±10′±20′注:A型牙顶圆弧半径R的最大值为0.144P,其变化范围由h1的实际尺寸而定。3.6标记示例粗牙统一螺纹,螺纹代号为1/4–20UNC,每25.4mm上为20牙,宽度40mm,2级精度,螺纹牙型A,45型滚丝轮:JB/T8824.7-19986统一螺纹滚丝轮45型A1/4–20UNC40–2JB/T8824.7—1998细牙统一螺纹,螺纹代号为1–12UNF,每25.4mm上为12牙,宽度60mm,1级精度,螺纹牙型A,75型滚丝轮:统一螺纹滚丝轮75型A1–12UNF60–1JB/T8824.7—19984技术要求4.1尺寸和位置公差4.1.1内孔、键槽、中径、螺距、牙型半角、牙顶高、牙底高等尺寸的公差按本标准相关的图和表规定。4.1.2其他项目在表9中给出。表9mm公差项目1级2级一副滚丝轮大径差及中径差0.10一副滚丝轮宽度差0.20支承端面对轴心线的圆跳动0.0445型,54型0.030.05外圆对轴心线的圆跳动75型0.050.0745型,54型0.030.04宽度至5075型45型,54型0.040.0550~8075型0.0645型,54型0.050.05中径和大径锥度80~10075型0.060.064.2材料和硬度4.2.1滚丝轮采用9SiCr和Cr12MoV合金工具钢或其他同等性能的合金工具钢制造,Cr12MoV的碳化物均匀度不大于3级。4.2.2滚丝轮工作部分硬度为59.5~62.5HRC。4.3外观和表面粗糙度4.3.1滚丝轮表面不得有裂纹、刻痕、锈迹以及磨削烧伤等影响使用性能的缺陷。4.3.2滚丝轮的表面粗糙度上限值按下列规定:螺纹牙型表面:1级精度Rz3.2µm;2、3级精度Rz6.3µm。内孔和两支承端面:Ra0.8µm。JB/T8824.7-199875标志和包装5.1滚丝轮上应标志a)制造厂或销售商商标;b)被加工螺纹代号;c)滚丝轮螺纹牙型(A或B);d)精度等级;e)制造材料;f)每副成套编号。5.2包