Lub hauv paus ntawm txhua yamfasteners(tsis suav cov pins, retainer rings, thiab lwm yam) nyob rau hauv threads -tsis muaj xov, lawv tsis tuaj yeem ua tiav mating (tshwj tsis yog tshwj xeeb fasteners xws li rivets). Cov xov yog ib txwm muab kauv concave-cov qauv convex machined ntawm cov hlau; ob threads tsim ib tug ua tiav locking muaj nuj nqi los ntawm kev sib hloov kev sib hloov thiab mating. Ntawm cov xov uas siv nyob rau hauv Suav teb, inch threads txawv ntawm metric (national standard) threads: nti sab nraud xov raug cov qhab nia yog denoted li 1A/2A/3A, thiab internal threads li 1B/2B/3B; metric threads yog teev los ntawm "M + txoj kab uas hla" (piv txwv li, M16), nrog cov qhab nia raug qhia los ntawm kev sib txuas ntawm cov lej thiab cov ntawv (xws li, xov sab nraud 6g, xov sab hauv 6H). Txawm hais tias metric los yog nti, qhov siab dua cov xov qib, qhov siab dua qhov kev sib raug zoo.
Qib 12.9 siab- lub zog bolts yog qhov yooj yim rau corrosion thaum ntim, khaws cia, lossis kev thauj mus los. Cov bolts lawv tus kheej ua tau raws li tus qauv xav tau, tab sis tom qab ntev - kev thauj mus los rau cov neeg siv khoom, cov kab xeb tuaj yeem tshwm sim ntawm lawv qhov chaw vim muaj ntau yam ib puag ncig, ua rau tsis tsim nyog poob xws li rov qab los. Qhov laj thawj tseem ceeb ntawm lub pob zeb xeb yog tias cov dej noo, carbon dioxide, thiab lwm yam khoom siv hauv qhov chaw corrode cov khoom nto thaum sib cuag, thaum kawg tsim cov pob zeb. Yog li ntawd, kev tiv thaiv zoo yuav tsum tau ua thaum lub sijhawm ua haujlwm no.
Cov txheej txheem electroplating tau tshwm sim li no. Electroplating tsis yog tsuas yog txhim kho cov tsos ntawm bolts, tab sis tseem ceeb tshaj, tiv thaiv xeb. Tam sim no, cov tshuab electroplating yog qhov paub tab, nrog rau ntau txoj hauv kev suav nrog electrogalvanizing, kub-dip galvanizing, thiab npib tsib xee plating. Cov txheej txheem electroplating tsim nyog tuaj yeem xaiv raws li daim ntawv thov scenario.
Qib 12.9 siab - lub zog boltsHauv kev siv tsis tu ncua feem ntau tsis electroplated thaum siv txhua hnub thiab khaws cia. Qhov no yog vim electroplating ntawm Qib 12.9 siab - lub zog bolts tuaj yeem yooj yim ua rau hydrogen embrittlement- feem ntau tsis tuaj yeem tswj tau thiab tam sim no qhov teeb meem uas yuav ua rau lub pob tawg thaum siv, ua rau muaj kev phom sij loj. Tag nrho Qib 12.9 siab - lub zog bolts tau txais kev kho oxidation blackening tom qab tsim khoom. Txoj kev kho no tsis zoo ib yam; tsis zoo li cov blackening ntau los ntawm boiling, nws yog oxidation blackening txheej txheem ua tiav los ntawm siab - kub thiab nruj txheej txheem ntws. Cov bolts kho muaj lub ntsej muag dub nrog lub ntsej muag oily me ntsis, uas tsis cuam tshuam rau kev siv ib txwm, thiab lawv yuav tsis xeb txawm tias tom qab xyoo ntawm kev khaws cia hauv cov chaw sab hauv tsev. Qee qhov tshwj xeeb ntawm Qib 12.9 siab- lub zog bolts hauv peb lub tsev khaws khoom tau khaws cia rau ntau tshaj kaum xyoo thiab tsis pom muaj kev cuam tshuam rau hnub no.
