螺栓最大扭緊力矩計(jì)算

1、螺栓最大扭緊力矩計(jì)算安裝時(shí)對(duì)于一般的零件裝配，靠操作者在扭緊時(shí)的感覺和經(jīng)驗(yàn)來擰緊螺栓就已經(jīng) 能滿足安裝要求。但對(duì)于重要的聯(lián)接，就需提供具體的扭緊力矩值來保證產(chǎn)品質(zhì)量與 安全。針對(duì)這一問題，現(xiàn)參考機(jī)械設(shè)計(jì)手冊(cè)及相關(guān)的機(jī)械設(shè)計(jì)資料，對(duì)螺栓的最大扭 緊力矩進(jìn)行詳細(xì)的分析計(jì)算，并把不同等級(jí)不同規(guī)格的螺栓的最大扭緊力矩計(jì)算結(jié)果 列成表格，供參考使用，為安裝現(xiàn)場(chǎng)提供準(zhǔn)確的扭緊力矩依據(jù)。二、分析計(jì)算3擰緊螺栓需要的預(yù)緊力矩 T= KFdXIO- （N.m）1. K 扭矩系數(shù)。K值大小主要與螺紋副摩擦、支承面摩擦有關(guān)，K= 0.150.2，加潤(rùn)滑油的可達(dá)0.12。根據(jù)機(jī)械設(shè)計(jì)（濮良貴 主編）建議，按K= 0.

2、2計(jì)算。2. F 預(yù)緊力（N）擰緊后螺紋連接件的預(yù)緊力F不得超過其材料屈服極限的80%，推薦按以下關(guān)系 式確定F。螺栓：FW( 0.6 0.7 )c sAi;不銹鋼螺栓：FW（ 0.50.6 ）c sA，即FW Ki c sAi,螺栓Ki取0.6,不銹鋼螺栓Ki取0.51）c s對(duì)應(yīng)等級(jí)螺栓的材料屈服極限（MPa （需查表）螺栓 性能等級(jí)3.64.64.85.65.86.88.89.810.912.9屈服極限3 smin/Mpa1902403003404204806407209401100不銹鋼螺栓性能等級(jí)A2-50A2- 70A2- 80屈服極限3 smin/Mpa2104506002） A

3、i螺栓危險(xiǎn)截面的面積，單位 mm根據(jù)機(jī)械設(shè)計(jì)（濮良貴 主編），危險(xiǎn)截面按螺栓小徑di計(jì)算，即2Ai = 1/4 XnX di故 Fw Ki(T sAi=Ki (TsX 1/4 XnX di2( N )3. d螺栓螺紋外徑(mr)i由以上分析，綜合得-3T=KFcX i02-3w KX( KiXt s X i/4 XnX di ) X dX i0=i/4 X KX KiXt s XnX i0 X di X d ( N.m)32即螺栓最大扭緊力矩 Tmax=i/4 X KX KiXt s XnX i0 X di X d (N.m) 三、扭緊力矩值表相同外徑的粗牙螺栓對(duì)應(yīng)一種螺栓小徑，而相同外徑的細(xì)

4、牙螺栓存在幾種螺栓小 徑。其中細(xì)牙螺栓優(yōu)選規(guī)格如下：細(xì)牙螺栓優(yōu)選規(guī)格dM6M8MiOMi2Mi6M20M24dX P -M8X iMiOx iMi2< i.5Mi6x i.5M20X 1.5M24X 2注：P螺距根據(jù)螺栓最大扭緊力矩Tmax計(jì)算公式，分別計(jì)算出不同規(guī)格螺栓最大扭緊力矩值 Tmax。以下列出常用的Tmax供設(shè)計(jì)使用。（注：對(duì)于細(xì)牙螺栓，選用細(xì)牙螺栓優(yōu)選規(guī)格 計(jì)算。）4.8級(jí)螺栓扭矩系數(shù)K預(yù)緊 力系 數(shù)Ki材料屈服極 限5 s(MPa)螺 栓 規(guī) 格螺栓外徑d(mm)粗牙螺栓小 徑 d1 ( mm)細(xì)牙螺栓小 徑 d1 ( mm)粗牙最大扭 緊力矩Tmax(N,m)細(xì)牙最大扭

5、 緊力矩Tmax(N,m)0.20.6300M664.917-4.1-0.20.6300M886.6476.9171010.80.20.6300M10108.3768.91719.822.50.20.6300M121210.10610.37634.736.50.20.6300M161613.83514.37686.693.50.20.6300M202017.29418.376169.11910.20.6300M242420.75221.835292.2323.58.8級(jí)螺栓扭矩系數(shù)K預(yù)緊 力系數(shù)K1材料屈服極限 5 s(MPa)螺 栓 規(guī) 格螺栓外徑d(mm)粗牙螺栓小 徑 d1 ( mm)細(xì)

6、牙螺栓小徑 d1 (mm)粗牙最大扭 緊力矩Tmax(N,m )細(xì)牙最大扭 緊力矩Tmax(N,m )0.20.6640M664.917-8.7-0.20.6640M886.6476.91721.323.10.20.6640M10108.3768.91742.3480.20.6640M121210.10610.37673.977.90.20.6640M161613.83514.376184.7199.50.20.6640M202017.29418.376360.8407.40.20.6640M242420.75221.835623.4690.210.9級(jí)螺栓扭矩系數(shù)K預(yù)緊 力系數(shù)K1材料屈服極

7、限 5 s(MPa)螺 栓 規(guī) 格螺栓外徑d(mm)粗牙螺栓小 徑 d1 ( mm)細(xì)牙螺栓小徑 d1 (mm)粗牙最大扭 緊力矩Tmax(N,m )細(xì)牙最大扭 緊力矩Tmax(N,m )0.20.6940M664.917-12.9-0.20.6940M886.6476.91731.333.90.20.6940M10108.3768.91762.270.40.20.6940M121210.10610.376108.6114.50.20.6940M161613.83514.376271.32930.20.6940M202017.29418.376529.9598.30.20.6940M24242

8、0.75221.835915.71013.712.9級(jí)螺栓扭矩系數(shù)K預(yù)緊 力系數(shù)K1材料屈服極 限 S s(MPa)螺 栓 規(guī) 格螺栓外徑d(mm)粗牙螺栓小 徑 d1( mm)細(xì)牙螺栓小徑 d1( mm)粗牙最大扭 緊力矩Tmax(N,m)細(xì)牙最大扭 緊力矩Tmax(N,m)0.20.61100M664.917-15-0.20.61100M886.6476.91736.639.70.20.61100M10108.3768.91772.782.40.20.61100M121210.10610.376127.1133.90.20.61100M161613.83514.376317.5342.80

9、.20.61100M202017.29418.376620.1700.20.20.61100M242420.75221.8351071.51186.3A2-50級(jí)不銹鋼螺栓扭矩系數(shù)K預(yù)緊 力系數(shù)K1材料屈服極 限 S s(MPa)螺 栓 規(guī) 格螺栓外徑d(mm)粗牙螺栓小 徑 d1 ( mm)細(xì)牙螺栓小徑 d1 (mm)粗牙最大扭 緊力矩Tmax(N,m )細(xì)牙最大扭 緊力矩Tmax(N,m )0.20.5210M664.917-2.4-0.20.5210M886.6476.9175.86.30.20.5210M10108.3768.91711.613.10.20.5210M121210.10

10、610.37620.221.30.20.5210M161613.83514.37650.554.50.20.5210M202017.29418.37698.7111.40.20.5210M242420.75221.835170.5188.7A2-70級(jí)不銹鋼螺栓扭矩系數(shù)K預(yù)緊 力系數(shù)K1材料屈服極限 S s(MPa)螺 栓 規(guī) 格螺栓外徑d(mm)粗牙螺栓小 徑 d1 ( mm)細(xì)牙螺栓小徑 d1 (mm)粗牙最大扭 緊力矩Tmax(N,m )細(xì)牙最大扭 緊力矩Tmax(N,m )0.20.5450M664.917-5.1-0.20.5450M886.6476.91712.513.50.20.

11、5450M10108.3768.91724.828.10.20.5450M121210.10610.37643.345.70.20.5450M161613.83514.376108.2116.90.20.5450M202017.29418.376211.4238.70.20.5450M242420.75221.835365.3404.4A2-80級(jí)不銹鋼螺栓扭矩系數(shù)K預(yù)緊 力系數(shù)K1材料屈服極 限 S s(MPa)螺 栓 規(guī) 格螺栓外徑d(mm)粗牙螺栓小 徑 d1 ( mm)細(xì)牙螺栓小徑 d1 (mm)粗牙最大扭 緊力矩Tmax(N,m )細(xì)牙最大扭 緊力矩Tmax(N,m )0.20.5600M664.917-6.8-0.20.5600M886.6476.91716.7180.20.5600M10108.3768.91733.137.50.20.5600M121210.10610.37657.860.90.20.5600M161613.83514.376144.3155.80.20.5600M202