Fastener kev kho cua sov, ntxiv rau kev tshuaj xyuas thiab kev tswj xyuas zoo, muaj qee qhov kev tshuaj xyuas thiab kev tswj xyuas tshwj xeeb, tam sim no peb hais txog kev kho cua sov ntawm ntau lub ntsiab lus tswj.
01 Decarburization thiab carburization
Txhawm rau txiav txim siab lub sijhawm ntawm lub tshuab hluav taws xob tswj lub tshuab hluav taws xob, koj tuaj yeem siv qhov ntsuas hluav taws xob thiab Rockwell hardness test rau decarburization thiab carburization rau kev txiav txim ua ntej.
Ntsuas ntsuas.
Yog cov quenched qhov chaw, nyob rau hauv lub grinder los ntawm qhov chaw thiab nyob rau hauv maj mam sib tsoo txim qhov chaw thiab lub plawv ntawm cov pa roj carbon ntau npaum li cas.Tab sis qhov no xav kom tus neeg teb xov tooj muaj cov txuj ci txawj ntse thiab cov teeb ci los txheeb xyuas lub peev xwm.
Rockwell hardness test.
Nws yog nqa tawm ntawm ib sab ntawm lub hexagonal ntsia liaj qhov rooj.Ua ntej lub hardened qhov chaw ntawm lub dav hlau hexagonal nrog cov ntawv xuab zeb maj mam polished, ntsuas thawj Rockwell hardness.Tom qab ntawd qhov saum npoo no hauv cov xuab zeb kom zom deb li 0.5 hli, thiab tom qab ntawd ntsuas Rockwell hardness.
Yog hais tias lub hardness tus nqi ntawm ob lub sij hawm yog yeej ib yam, uas tsis yog decarburization, los yog carburization.
Thaum lub hardness yav dhau los qis dua qhov hardness tom kawg, nws txhais tau tias qhov saum npoo yog decarburized.
Lub hardness yav dhau los yog siab tshaj qhov tom kawg hardness, uas lub deg carburization.
Feem ntau, ob qhov sib txawv hardness ntawm 5HRC los yog tsawg dua, nrog rau txoj kev metallographic los yog microhardness txoj kev, qhov chaw ntawm decarburization los yog carburization yog qhov pib nyob rau hauv qhov kev tsim nyog.
02 Hardness thiab lub zog
Hauv kev sim threaded fastener, tsis tuaj yeem tsuas yog raws li tus nqi hardness ntawm phau ntawv uas cuam tshuam, hloov mus rau tus nqi zog.Muaj qhov hardenability yam nyob nruab nrab.
Feem ntau, lub hardenability ntawm cov khoom yog zoo, lub hardness ntawm cross-section ntawm cov ntsia hlau seem yuav tsum uniformly faib, tsuav yog lub hardness yog tsim nyog, lub zog thiab xyuas kom meej tias cov kev nyuaj siab kuj yuav ua tau raws li qhov yuav tsum tau;
Thaum lub hardenability ntawm cov khoom tsis zoo, txawm hais tias raws li ib feem ntawm daim tshev, lub hardness yog tsim nyog, tab sis lub zog thiab guarantees kev nyuaj siab feem ntau tsis ua raws li cov kev cai.Tshwj xeeb tshaj yog thaum lub deg hardness nyhav rau qis qis, txhawm rau tswj lub zog thiab lav kev ntxhov siab hauv qhov tsim nyog, feem ntau txhim kho qhov qis qis ntawm hardness.
03 Kev sim siab
Retempering test tuaj yeem tshawb xyuas qhov quenching hardness tsis txaus, nrog rau qhov kub thiab txias heev kom NW nyuam qhuav ncav cuag lub hardness ntau yam ntawm kev ua haujlwm tsis raug, kom ntseeg tau tias cov khoom siv kho tshuab dav dav ntawm cov khoom.
Tshwj xeeb tshaj yog tsawg carbon martensitic steel manufacturing threaded fasteners, tsis tshua muaj kub tempering, txawm hais tias lwm yam khoom muaj peev xwm ua tau raws li qhov yuav tsum tau, tab sis qhov kev ntsuas ntawm guaranteed kev nyuaj siab, cov residual elongation fluctuation yog heev loj, deb tshaj 12.5um, thiab nyob rau hauv tej yam kev mob ntawm kev siv. yuav yog qhov tshwm sim tam sim ntawd tawg, hauv qee lub tsheb thiab kev tsim kho ntawm bolts, tau tshwm sim nyob rau hauv qhov tshwm sim ntawm kev tawg tam sim ntawd.
Thaum qhov ntsuas kub qis tshaj plaws, tuaj yeem txo qhov tshwm sim saum toj no, tab sis nrog qis carbon martensitic steel manufacturing 10.9 qib bolts, yuav tsum tau ceev faj tshwj xeeb.
04 Kev tshuaj xyuas ntawm hydrogen embrittlement
Lub susceptibility rau hydrogen embrittlement nce nrog lub zog ntawm fastener.Sab nraud threaded fasteners ntawm qib 10.9 thiab siab dua, nto hardened self-tapping screws, ua ke screws nrog hardened steel washers, thiab lwm yam yuav tsum dehydrogenated tom qab plating.
Kev kho dehydrogenation feem ntau yog nyob rau hauv qhov cub lossis tempering rauv, tuav ntawm 190 ~ 230℃rau ntau tshaj 4h, kom hydrogen diffusion tawm.
"Iron tseem xav tau nws tus kheej hardness!"Txawm hais tias qhov xwm txheej ntawm kev lag luam hloov pauv li cas, kev txhim kho cov txheej txheem tsim khoom kuj yog ib qho txiaj ntsig zoo los tiv thaiv kev pheej hmoo.
Nyob rau hauv cov txheej txheem kho cua sov fastener, nws yog ib qho tseem ceeb heev uas yuav tsum tau ua ib txoj hauj lwm zoo nyob rau hauv cov ntsiab lus tswj cov ntsiab lus tseem ceeb, uas kuj yog ib qho ntawm txhua yam zoo fastener cua sov kev lag luam yuav tsum ua kom zoo.
Post lub sij hawm: Jan-17-2024