Txhais, Cov Khoom Siv thiab Cov Qib Kev Ua Haujlwm Ntawm Lub Zog Muaj Zog Bolts

High-lub zog boltsyog tsim los ntawm high-strength alloy steel thiab muaj peev xwm ntawm bearing loj pre-tightening nro. Lawv tau dav siv rau kev sib txuas tseem ceeb hauv kev tsheb ciav hlau, txuas hniav, cov qauv hlau, cov khoom siv high-pressure thiab ultra-high-pressure. Kev tawg hom ntawm lub zog siab bolts feem ntau yog nkig tawg. Nyob rau hauv cov hlab ntsha siab thiab cov cuab yeej siv siab, cov txheej txheem loj-txheej preload feem ntau yog siv los xyuas kom meej tag nrho cov sealing kev ua tau zoo.

Kev sib txuas ntawm cov bolts muaj zog yog nyob ntawm kev sib txhuam ntawm qhov chaw sib txuas ntawm cov khoom sib txuas kom tiv thaiv cov txheeb ze zawv zawg. Txhawm rau muab kev sib txhuam kom txaus los tiv thaiv kev sib txhuam, nws yog ib qho tsim nyog yuav tsum tau ua kom cov ntsia hlau ua ntej nro, txhim kho cov khoom siv clamping quab yuam thiab txhim kho qhov sib txhuam coefficient ntawm kev sib cuag. Lub clamping quab yuam ntawm cov khoom yog kiag li muab los ntawm bolt pre-tension. Yog li ntawd, high-strength steel yuav tsum tau saws rau bolt manufacturing, uas txhais cov yam ntxwv tseem ceeb ntawm high-strength bolt kev twb kev txuas.

Kev sib txhuam coefficient zoo heev cuam tshuam rau cov kabmob muaj peev xwm ntawm kev sib txuas ntawm lub zog loj. Nws yog tsuas yog txiav txim siab los ntawm kev sib cuag saum npoo thiab cov khoom siv substrate ntawm cov khoom sib txuas. Hauv kev tsim kho, kev sib cuag ntawm qhov chaw feem ntau yog kho los ntawm sandblasting thiab steel hlau txhuam kom tshem tawm cov nplais oxide, roj stains thiab impurities, thiaj li ua rau kom muaj kev sib txhuam coefficient thiab ua kom muaj kev sib txuas ruaj khov.

1. Cov khoom siv thiab kev ua tau zoo ntawm cov ntsia hlau muaj zog

Lub zog tensile, hardness thiab tag nrho cov khoom siv ntawm lub zog muaj zog bolts nyob ntawm cov ntaub ntawv substrate thiab quenching & tempering cua sov txheej txheem. Pa quenched 40Cr steel hardly ua tau raws li cov khoom yuav tsum tau uaQib 10.9 high-strength boltsnyob rau hauv kev ruaj ntseg. Hauv kev tshuaj xyuas niaj hnub, lub zog tensile tuaj yeem txiav txim siab ua ntej los ntawm qhov tawv tawv tom qab kev kho cua sov. Bolts ua los ntawm cov khoom sib txawv sib txawv hauv qhov kev ua haujlwm tawg qeeb thiab kev ua haujlwm qaug zog nyob rau hauv cov kev ntxhov siab.

40Cr high-strength bolts feem ntau yog siv rau hauv bolt pob sib koom ua ke kab sib chaws nrog cov qauv tsim muaj peev xwm tswj tau. Lub zog tsim yog kwv yees li 390 MPa rau bolts nrog txoj kab uas hla Ntau dua lossis sib npaug ntawm 30 mm thiab 430 MPa rau bolts nrog txoj kab uas hla ＜ 30 mm, nrog rau kev ntxhov siab ua ntej tsis muaj kev ntxhov siab nyob rau hauv ib txwm ua haujlwm. Kev txheeb xyuas nruj ntawm kev ncua kev puas tsuaj yog yuav tsum tau siv rau hauv kev ua haujlwm hnyav nrog kev ua haujlwm siab thiab kev ntxhov siab. Zuag qhia tag nrho, 20MnTiB cov ntaub ntawv nthuav tawm kev ncua kev puas tsuaj zoo dua li 40Cr thiab 40B.

Raws li GB / T 1231, cov ntaub ntawv pom zoo rau Qib 10.9S loj hexagon high-strength bolts yog 20MnTiB rau specifications Tsawg dua los yog sib npaug rau M24 thiab 35VB rau specifications tsawg dua los yog sib npaug rau M30. Loj-inch siab-strength bolts yog ib qho nyuaj rau ua tiav tag nrho quenching nkag mus, ua rau cov tub ntxhais tsis tsim nyog lub zog. Yog li ntawd, cov bolts loj loj yuav tsum tau zam hauv kev siv engineering. Yog tias tsim nyog, tus qauv tsim ua haujlwm kev ntxhov siab yuav tsum raug txo kom ntseeg tau tias muaj kev nyab xeeb.

Thauj tog rau nkoj bolts thiab tshwj xeeb-zoo li tus ntsia liaj qhov rooj (xws li GB799 txheem thauj tog rau nkoj bolts thiab L-hom bolts) npog ntau yam specifications ntawm M6-M120 nrog unlimited ntev. Cov ntaub ntawv muaj xws li Q235, 45 # steel, Q345B, 40Cr thiab 35CrMoA. Cov yam ntxwv muaj xws li ncaj nuv, arc nuv, thauj tog rau nkoj claw thiab stiffened thauj tog rau nkoj phaj. Ntawm lawv, 40Cr thiab 35CrMoA yog cov khoom siv muaj zog siab rau kev ua haujlwm hnyav ntawm cov khoom siv hauv paus thiab cov qauv hlau.

2. Cov khoom siv sib txuam thiab cov qauv siv rau Torshear Hom Siab-Strength Bolts

Rau Qib 10.9 torshear hom high-strength bolts rau steel qauv (kev sib txhuam-hom kev sib txuas nrog tus qauv kev sib txhuam coefficient ntawm 0.45), cov khoom sib txuam tau teev tseg raws li hauv qab no: bolt khoom: 20MnTiB; txiv ntseej khoom: 15MnVB. Lub rooj sib txoos fastener no ua raws li lub teb chaws tus qauvGB / T 3632-2008 Torshear Hom Lub Zog Muaj Zog Bolt, Txiv Ntseej thiab Washer Sib Sau rau Cov Qauv Hlau, uas yuav tsum tau ua raws li kev yuav khoom, tshuaj xyuas thiab kev tsim kho.

3. Kev faib tawm thiab cov txheej txheem ntawm Bolt Performance Grade

Mechanical zog ntawm carbon steel thiaballoy steel bolts, screws thiab studstau muab faib ua kaum qib: 3.6, 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.9 thiab 12.9. Cov xov kab uas siv tau yog li ntawm 1.6 hli mus rau 39 hli nrog kev ua haujlwm kub ntawm -50℃txog 300 degree. Kev ua haujlwm kub ntawm cov hlau tsis pub dawb yuav tsum tsis pub tshaj 250 degree.

Unified kev lag luam kev faib tawm:Bolts ntawm Qib 8.8 thiab siab dua yog ua los ntawm cov pa roj carbon nruab nrab lossis cov hlau tsis tshua muaj hlau los ntawm quenching thiab tempering kev kho cua sov, txhais tau tias muaj zog bolts; bolts hauv qab Qib 8.8 txhais tau tias yog bolts zoo tib yam.

Txhua qib kev ua tau zoo ntawm lub bolt muaj ob daim duab, sawv cev rau qib nominal tensile lub zog thiab cov txiaj ntsig sib piv. Qhov no yog tus qauv thoob ntiaj teb universal. Bolts ntawm tib qib xa cov khoom sib npaug tsis hais cov khoom siv thiab cov hauv paus chiv keeb, yog li tsuas yog qib kev ua tau zoo tau txais los rau kev xaiv tsim.

Piv txwv 1: Qib 4.6 zoo tib yam ntsia liaj qhov rooj

1. Nominal tensile zog: 400 MPa;

2. Yield ratio: 0.6;

3. Nominal yield zog: 400 MPa × 0.6=240 MPa.

Piv txwv 2: Qib 10.9 siab zog bolt (tom qab kev kho cua sov)

1. Nominal tensile zog: 1000 MPa;

2. Yield ratio: 0.9;

3. Nominal yield zog: 1000 MPa × 0.9=900 MPa.