螺栓最大扭緊力矩計算

1、螺栓最大扭緊力矩計算安裝時對于一般的零件裝配，靠操作者在扭緊時的感覺和經(jīng)驗來擰緊螺栓就已經(jīng)能滿足安裝要求。但對于重要的聯(lián)接，就需提供具體的扭緊力矩值來保證產(chǎn)品質(zhì)M與安全。針對這一問題，現(xiàn)參考機械設計手冊及相關的機械設計資料，對螺栓的最大扭緊力矩進行詳細的分析計算，并把不同等級不同規(guī)格的螺栓的最大扭緊力矩計算結(jié)果列成表格，供參考使用，為安裝現(xiàn)場提供準確的扭緊力矩依據(jù)。二、分析計算3擰緊螺栓需要的預緊力矩 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，K= 0.15? 0.2,加潤滑油的可達0.12。根據(jù)機械設計(濮良貴 主編)建議，按K= 0.2計

2、算。2. F預緊力N )擰緊后螺紋連接件的預緊力 F不得超過其材料屈服極限的80%,推薦按以下關系 式確定F。螺栓：FW( 0.6 ? 0.7 )c sAi；不銹鋼螺栓：FW ( 0.5? 0.6 ) c sA ,即FW Ki c sAi,螺栓Ki取0.6，不銹鋼螺栓Ki取0.51) c s對應等級螺栓的材料屈服極限(MPa (需查表)螺栓性能等級3.64.64.85.65.86.88.89.810.912.9屈服極限3smin/Mpa1902403003404204806407209401100不銹鋼螺栓性能等級A2-50A2- 70A2- 80屈服極限3smin/Mpa2104506002

3、) Ai螺栓危險截面的面積，單位mm根據(jù)機械設計(濮良貴主編)，危險截面按螺栓小徑di計算，即2 Ai = 1/4 XnX d i故 Fw Ki(T sAi=Ki (TsX 1/4 XnX d i2( N )3. d -一 螺栓螺紋外徑(mr)i由以上分析，綜合得-3T=KFcX i0 2-3w KX( KiXt s X i/4 XnX d i ) X dX i0= i/4 X KX KiXt s XnX i0 X d i X d ( N.m)32即螺栓最大扭緊力矩 Tmax =i/4 X KX KiXt s XnX i0 X d i X d (N.m)三、扭緊力矩值表相同外徑的粗牙螺栓對應一

4、種螺栓小徑，而相同外徑的細牙螺栓存在幾種螺栓小徑。其中細牙螺栓優(yōu)選規(guī)格如下:細牙螺栓優(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計算公式，分別計算出不同規(guī)格螺栓最大扭緊力矩值Tmax。以下列出常用的Tmax供設計使用。(注：對于細牙螺栓，選用細牙螺栓優(yōu)選規(guī)格計算。)4.8級螺栓扭矩系數(shù)K預緊力系數(shù)Ki材料屈服極限5s(MPa)螺栓規(guī)格螺栓外徑d(mm)粗牙螺栓小徑d i ( mm)細牙螺栓小徑d 1 ( mm)粗牙最大扭緊力矩 Tmax(N,m)細牙最

5、大扭緊力矩 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級螺栓扭矩系數(shù)K預緊力系數(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)細牙螺栓小

6、徑 d1 (mm)粗牙最大扭緊力矩 Tmax(N,m )細牙最大扭緊力矩 Tm ax(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級螺栓扭矩系數(shù)K預緊力系數(shù)K1材料屈服極限 5

7、s(MPa)螺栓規(guī)格螺栓外徑d(mm)粗牙螺栓小徑d1 ( mm)細牙螺栓小徑 d1 (mm)粗牙最大扭緊力矩 Tmax(N,m )細牙最大扭緊力矩 Tmax(N,m )0.20.6940M664.917-12.9-0.20.6940M886.6476.91731.333.90.20.6940M10108.3768.91762.270.40.20.6940M121210.10610.376108.6114.50.20.6940M161613.83514.376271.32930.20.6940M202017.29418.376529.9598.30.20.6940M242420.75221.8

8、35915.71013.712.9級螺栓扭矩系數(shù)K預緊力系數(shù)K1材料屈服極限Ss(MPa)螺栓規(guī)格螺栓外徑d(mm)粗牙螺栓小徑d1( mm)細牙螺栓小徑 d1( mm)粗牙最大扭緊力矩 Tmax(N,m)細牙最大扭緊力矩 Tmax(N,m)0.20.61100M664.917-15-0.20.61100M886.6476.91736.639.70.20.61100M10108.3768.91772.782.40.20.61100M121210.10610.376127.1133.90.20.61100M161613.83514.376317.5342.80.20.61100M202017.2

9、9418.376620.1700.20.20.61100M242420.75221.8351071.51186.3A2-50級不銹鋼螺栓扭矩系數(shù)K預緊力系數(shù)K1材料屈服極限Ss(MPa)螺栓規(guī)格螺栓外徑d(mm)粗牙螺栓小徑d1 ( mm)細牙螺栓小徑 d1 (mm)粗牙最大扭緊力矩 Tmax(N,m )細牙最大扭緊力矩 Tmax(N,m )0.20.5210M664.917-2.4-0.20.5210M886.6476.9175.86.30.20.5210M10108.3768.91711.613.10.20.5210M121210.10610.37620.221.30.20.5210M16

10、1613.83514.37650.554.50.20.5210M202017.29418.37698.7111.40.20.5210M242420.75221.835170.5188.7A2-70級不銹鋼螺栓扭矩系數(shù)K預緊力系數(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)細牙螺栓小徑 d1 (mm)粗牙最大扭緊力矩 Tmax(N,m )細牙最大扭緊力矩 Tmax(N,m )0.20.5450M664.917-5.1-0.20.5450M886.6476.91712.513.50.20.5450M10108.3768.91724.828.10.20.5

11、450M121210.10610.37643.345.70.20.5450M161613.83514.376108.2116.90.20.5450M202017.29418.376211.4238.70.20.5450M242420.75221.835365.3404.4A2-80級不銹鋼螺栓扭矩系數(shù)K預緊力系數(shù)K1材料屈服極限Ss(MPa)螺栓規(guī)格螺栓外徑d(mm)粗牙螺栓小徑d1 ( mm)細牙螺栓小徑 d1 (mm)粗牙最大扭緊力矩 Tmax(N,m )細牙最大扭緊力矩 Tmax(N,m )0.20.5600M664.917-6.8-0.20.5600M886.6476.91716.7180.20.5600M10108.3768.91733.137.50.20.5600M121210.10610.37657.860.90.20.5600M161613.83514.376144.3155.80.20.5600M20