Kev txheeb xyuas cov khoom siv Bolt

Bolts yog txuas fasteners cais los ntawm cov cuab yeej cuab yeej cuab tam rau hauv cov bolts zoo tib yam thiabmuaj zog bolts. Cov ntaub ntawv sib txawv ncaj qha cuam tshuam rau kev ua haujlwm ntawm lub tshuab thiab siv ntau yam ntawm bolts. Hauv qab no yog ib qho kev ntsuam xyuas ntawm cov khoom siv bolt feem ntau siv rau kev xaiv siv.

1. Cov khoom siv rau Ordinary Bolts

Bolts hauv qab Cov Khoom Siv Chav Kawm 8.8 yog qhov zoo tib yam-lub zog bolts, feem ntau yog ua los ntawm cov pa roj carbon tsawg lossis nruab nrab-carbon steel hlau qws los ntawm lub taub hau txias thiab xov dov, tsis muaj quenching thiab tempering kub kho. Siv cov feem ntau siv Class 4.8 ua piv txwv: lub nominal tensile lub zog yog tsis tsawg tshaj li 400 MPa, qhov yield-rau-tensile piv yog 0.8, thiab lub nominal yield zog tsis tsawg tshaj li 400 × 0.8=320 MPa.

Common wire rod qib rau cov bolts zoo xws li:

1008K

1010

1015K

1032

1035

1040

CH38F

1039

Lwm cov pa roj carbon steel hlau rods ua tau raws li qhov yuav tsum tau ua

Cov saum toj no carbon steel hlau rods yog inherently tsis-sib nqus-dawb; Cov yam ntxwv tsis sib nqus feem ntau siv raustainless hlau fasteners. Tom qab ua haujlwm txias, austenitic stainless hlau tsim cov hlau nplaum tsis muaj zog: 304M tom qab ua haujlwm txias muaj qhov sib nqus ntawm kwv yees li 1.6 μ rau 2.0 μ, 304HC kwv yees li 1.01 μ rau 1.6 μ, thiab Qib 316 tom qab ua haujlwm txias muaj cov hlau nplaum qis dua 1.01 μ.

2. Cov khoom siv rau cov ntsia hlau muaj zog

High-strength bolts xav tau cov ntaub ntawv nrog lub zog tensile ntau dua kom tau raws li qhov xav tau ntau dua preload thiab load-bearing xav tau. quenching thiab tempering kev kho cua sov muaj qhov cuam tshuam loj rau cov khoom siv zog. Tom qab tempering, 40Cr feem ntau tsis tuaj yeem ua tau raws li cov khoom yuav tsum tau ua ntawm Chav Kawm 10.9S cov qauv siv lub zog siab; Raws li kev soj ntsuam tsawg, qhov tawv tawv tom qab tempering tuaj yeem siv ua ntej siv rau qib khoom siv zog. Nyob rau hauv kev ntxhov siab, lub zog muaj zog bolts ua los ntawm cov khoom sib txawv muaj qhov sib txawv ncua kev puas tsuaj.

2.1 40Cr High-strength Bolts

40Cr high-strength bolts yog tsuas yog siv nyob rau hauv bolt-pob qhov chaw trusses. Lawv lub zog tsim feem ntau yog 390 MPa (d Ntau dua lossis sib npaug ntawm 30 mm) lossis 430 MPa (d < 30 mm), nrog rau kev ntxhov siab ua ntej tensile qis hauv kev pabcuam ib txwm muaj. Thaum ua ntawv thov rau tej yam kev mob uas yuav tsum tau siab preload, ncua ncua kev puas tsuaj ntawm cov khoom yuav tsum tau ua tib zoo soj ntsuam thiab xyuas kom meej.

2.2 20MnTiB High-Strength Bolts

20MnTiB yog cov hlau tsis muaj carbon boron-alloy. Tom qab quenching thiab tempering, nws muab cov khoom zoo sib npaug, thiab nws qhov kev ncua kev puas tsuaj yog zoo dua li ntawm 40Cr thiab 40B, ua rau nws tsim nyog rau high-preload, high-stress steel qauv kev sib txuas.

2.3 Txheem-pom zoo xaiv cov khoom

Raws li tam sim no Suav teb chaws tus qauv rau high-lub zog lojhexagon taub hau ntsia liaj qhov rooj, txiv ntseej thiab ntxhua khaub ncaws rau cov qauv hlau, cov ntaub ntawv pom zoo rau Chav Kawm 10.9S bolts yog raws li hauv qab no:

Loj Less dua los yog sib npaug rau M24: 20MnTiB;

Loj: M27-M30: 35VB.

Loj-inch siab-strength bolts yog qhov nyuaj los ntawm-harden thaum lub sij hawm tempering, yog li yuav tsum tau zam dhau qhov loj diameters. Yog hais tias qhov loj-inch bolts xav tau, kev ua haujlwm kev ntxhov siab yuav tsum raug txo kom haum, thiab cov khoom siv hardenability yuav tsum raug txheeb xyuas kom tau raws li qhov yuav tsum tau ua ntawm kev ua haujlwm hla ntu.

3. Cov ntsiab lus

Rau ob qho tib si bolts thiab siab zog bolts, cov khoom xaiv ncaj qha cuam tshuam rau lub zog, toughness, qaug zog tsis kam, ncua kev puas ntsoog tsis kam thiab siv tau ntau yam kev pabcuam. Thaum xaiv, sib piv cov ntaub ntawv qib thiab cov txheej txheem kho cua sov yuav tsum raug xaiv raws li cov chav kawm thauj khoom, cov kev xav tau ua ntej, ib puag ncig kev pabcuam thiab cov qauv tsim nyog kom ntseeg tau tias muaj kev sib koom ua ke.