1. Cov ntsiab lus txawv
Lub ntsiab lus ntawm bolt kev ua tau zoo qib yog tus qauv thoob ntiaj teb. Bolts ntawm tib qib kev ua tau zoo muaj qhov ua tau zoo ib yam tsis hais lawv cov ntaub ntawv thiab keeb kwm. Tsuas yog qib kev ua tau zoo tuaj yeem xaiv rau kev tsim.
Raws li cov kev cai, bolts uas nws qib siab tshaj 8.8 yog hu ua high-strength bolts. Bolts ntawm qib 8.8 thiab siab dua yog ua los ntawm cov hlau tsis tshua muaj carbon hlau lossis cov pa nruab nrab carbon steel thiab tau raug kho cua sov (quenched thiab tempered). Lawv feem ntau hu ua lub zog muaj zog bolts, thiab tus so yog sib sau ua ke hu ua bolts zoo tib yam. Conventionally, kev kho cua sov yog ua tom qab rub cov ntaub lo lo ntxhuav.
2. qhov kev siv zog sib txawv
High-strength bolts tuaj yeem tiv taus qhov hnyav dua li cov bolts zoo tib yam ntawm tib qhov tshwj xeeb.
3. Cov khoom sib txawv
High-strength bolts yog ua los ntawm cov ntaub ntawv muaj zog. Cov ntsia hlau, txiv ntseej thiab ntxhua khaub ncaws ntawm lub zog siab bolts yog txhua yam ua los ntawm cov hlau muaj zog, xws li No. 45 steel, 40 boron steel, 20 manganese titanium boron steel, 35CrMoA thiab lwm yam. Ordinary bolts feem ntau yog ua los ntawm Q235 (sib npaug rau A3 yav dhau los) hlau.
4. Cov qib sib txawv ntawm lub zog
Qib kev ua tau zoo ntawm bolts siv rau kev sib txuas steel qauv muaj ob feem ntawm cov ntaub ntawv, thiab cov qib tau muab faib ua ntau tshaj 10 qib xws li 3.6, 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.9, 12.9, 14.9 , 15.8, 15.9, 16.8, thiab lwm yam.
General bolts siv "XY" los sawv cev lub zog, uas feem ntau sawv cev rau lub npe tensile lub zog tus nqi thiab tawm los lub zog piv ntawm cov khoom siv ntsia liaj qhov rooj, X * 100= lub zog tensile ntawm lub ntsia liaj qhov rooj, X * 100 * (Y / 10 )=lub bolt tawm lub zog.
Piv txwv li: bolts nrog kev kawm qib 4.6 txhais tau tias: lub nominal tensile lub zog ntawm cov khoom siv ntsia liaj qhov rooj yog 400MPa; yield zog piv ntawm cov khoom siv ntsia liaj qhov rooj yog 0.6; lub nominal yield zog ntawm cov khoom siv ntsia liaj qhov rooj yog 400 * 0.6=240MPa.
5. Txawv zog yam ntxwv
High-strength bolts siv pretension thiab kis sab nraud quab yuam los ntawm kev sib txhuam. Ordinary bolt kev twb kev txuas xa shear quab yuam los ntawm shear tsis kam ntawm bolt pas nrig thiab lub siab bearing ntawm lub qhov phab ntsa. Thaum cov txiv ntseej nruj, lub zog ua ntej nruj me ntsis, thiab nws lub zog tuaj yeem tsis quav ntsej.
Ntxiv nrog rau nws cov khoom siv siab, lub zog muaj zog bolts kuj tseem siv lub zog ua ntej nro rau lub bolts los tsim lub zog extrusion ntawm cov khoom sib txuas, kom muaj kev sib txhuam loj loj perpendicular mus rau cov kev taw qhia ntawm cov ntsia hlau, thiab Pre-tension force thiab anti-slip coefficient Ob hom steel thiab steel ncaj qha cuam tshuam rau cov kabmob muaj peev xwm ntawm lub zog siab bolts.
