Vim li cas nws tawg thaum lub sij hawm stamping txheej txheem?
Thaum ntau tus neeg yuav khoom lossis cov kws tshaj lij ntsib kev tawg hauv cov txheej txheem stamping, lawv thawj cov tshuaj tiv thaiv feem ntau yog "tsis muaj zog". Txawm li cas los xij, rau cov ntaub ntawv zoo liSIB 295, uas yog siv rau kev sib sib zog nqus nqus ntawm cov roj lub tog raj kheej taub hau, qhov xwm txheej yog qhov txawv heev. Kev tawg yog feem ntau tsis yog vim cov khoom siv "tsis muaj zog heev", tab sis vim tias nws "nkig dhau" lossis muaj "tsis xws luag hauv nws cov microstructure".
Cov lus piav qhia ntxaws
Elongation (Extension Rate) - Lub peev xwm "compromise" ntawm cov khoom siv
Standard xav tau vs.
JIS G3116 tus qauv qhia tias qhov elongation tus nqi ntawm SG295 yuav tsum siab dua lossis sib npaug li 26%.
Cov hlau coils peb muab muaj cov ntsiab lus ntawm 27-32%. Qhov no 4-6% margin yog thawj kab ntawm kev tiv thaiv.
Vim li cas elongation tseem ceeb?
Thaum lub sij hawm stamping txheej txheem, cov hlau phaj yuav tsum tau ua kom nruj stretching. Piv txwv li, ntawm lub taub hau sealing ntawm lub tog raj kheej roj, cov khoom yuav raug elongated thiab thinned kom haum cov pwm.
Qhov siab dua qhov elongation tus nqi, ntau dua lub peev xwm stretching cov khoom tuaj yeem tiv taus ua ntej tawg. Yog tias qhov elongation tus nqi ntawm koj cov khoom tsuas yog nyob ntawm 26% tus qauv kab, ib zaug dov kev taw qhia ntawm cov khoom siv raw tsis sib haum nrog cov kev taw qhia kev ntxhov siab, lossis muaj qhov hloov pauv me ntsis hauv pwm qhov sib txawv, nws yooj yim mus txog qhov deformation txwv ntawm cov khoom, ua rau tawg.
"Peb cov khoom siv tus nqi raug nce mus txog 27-32%," uas muab cov neeg siv khoom tsim cov txheej txheem nrog qhov dav thiab muaj kev nyab xeeb dua "qhov rais txheej txheem". Txawm hais tias cov pwm yog hnav me ntsis los yog lub lubrication tsis zoo, cov khoom tseem tuaj yeem "kev sib haum xeeb" thiab deform yam tsis muaj kev tawg.
Manganese (Mn) thiab Carbides - Qhov pom tsis pom "Starting Point" ntawm Cracks
Manganese yog "ob- ntaj ntug":
Tus qauv qhia tias Mn yuav tsum tsawg dua lossis sib npaug li 1.00%. Lub luag haujlwm tseem ceeb ntawm manganese yog txhawm rau txhim kho lub zog.
Txawm li cas los xij, nyob rau hauv qee qhov xwm txheej, manganese ua ke nrog cov pa roj carbon monoxide (Fe, Mn) ₃C carbides (ledeburite) ntawm cov ciam teb. Cov carbides no tsis tshua muaj zog thiab nkig.
Cov "form" ntawm carbides txiav txim lub neej thiab kev tuag:
Filamentous carbides (feem ntau txaus ntshai): Yog tias cov txheej txheem tsim khoom (tshwj xeeb tshaj yog dov kub thiab deoxidation txoj kev) tsis raug tswj kom zoo, carbides yuav tsim nruam lossis ib nrab - cov yeeb yaj kiab txuas ntxiv raws li cov ciam teb. Qhov no zoo li sib xyaw cov iav ntse ntse rau hauv cov cement (grain boundaries) ntawm cib (grain particles). Thaum raug stamping thiab ncab, qhov kev ntxhov siab yuav mloog zoo rau cov yeeb yaj kiab no, thiab cov kab noj hniav me me (Microvoids) yuav tshwm sim ntawm no. Cov kab noj hniav no txuas sai sai, ua rau pom cov nplej - ciam teb tawg uas tuaj yeem pom ntawm qhov muag liab qab, ua rau kev puas tsuaj ntawm cov khoom ua haujlwm.
Granular carbides (kev xaiv muaj kev nyab xeeb): Los ntawm kev ua kom zoo dua cov txheej txheem smelting (xws li Al-tua hlau) thiab ua kom kub dov, cov carbides tuaj yeem hloov los ntawm "zaj duab xis- zoo li" rau cov ntawv cais lossis "thaiv-zoo li" cov ntawv. Cov nyhuv fragmented ntawm grain ciam teb ntawm granular carbides yog tsawg dua, thiab cov khoom tseem tuav zoo plasticity thiab formability.
Kev tswj hwm cov ntsiab lus ntawm manganese nruj (0.80 - 0.95%): Peb tsis tsuas yog ua tau raws li cov kev txwv siab tshaj plaws, tab sis kuj tseem khaws cov ntsiab lus ntawm manganese nyob rau hauv 'kub kub' uas tuaj yeem ua kom muaj zog (295 MPa +) thaum zam dhau kev tsim cov nkig carbides vim manganese cais.
Optimizing carbide morphology los ntawm cov txheej txheem: Peb cov khoom tau ua tiav zoo ib yam li 'aluminium deoxidized steel', aiming kom cov nplej ciam carbides muaj nyob rau hauv daim ntawv tsis muaj teeb meem es tsis yog zaj duab xis -zoo li daim ntawv uas ua rau tawg. Qhov no yog metallurgical zais cia tom qab peb cov khoom tswj hwm tus nqi siab (raws li qhia los ntawm cov neeg siv khoom ntawm 98%) thaum sib sib zog nqus stamping.
Xaus
Yog tias koj ntsib kev tawg thaum lub sijhawm nias ntawm SG295, sib nrug los ntawm kev tshuaj xyuas cov pwm, koj tuaj yeem xav txog peb lub ntsiab lus hauv qab no los ntawm kev xav ntawm cov khoom:
Saib ntawm tus nqi elongation: Puas yog nws tsuas yog ua tau raws li tus qauv yam tsawg kawg nkaus? Xaiv cov ntaub ntawv nrog qhov loj elongation tus nqi paj (xws li 28% lossis ntau dua).
Tshawb xyuas cov ntsiab lus ntawm manganese: Puas yog cov ntsiab lus manganese ze rau qhov txwv siab tshaj ntawm 1.0%, lossis nws puas yuav tsum khaws cia nyob rau hauv ntau qhov nruab nrab?
Tshawb xyuas Daim Ntawv Pov Thawj: Tus neeg muag khoom puas tuaj yeem muab MTC (cov ntaub ntawv pov thawj ntawm lub Hoobkas) thiab xyuas kom meej qhov traceability ntawm lub cub tawg batch tooj? Vim hais tias yog hais tias lub curling kub tswj ntawm ib tug tej yam cub tawg khiav fluctuates, nws yuav ua rau lub deterioration ntawm carbide morphology ntawm no batch. Traceability yog lub neej rau kev taug qab lub hauv paus ntawm qhov teeb meem.
Tuam Tshoj ib qho - nres cov khoom siv hlau
Los ntawm xyoo ntawm kev nkag siab thiab nag lossis daus ntawm cov hlau, Yuxin Group tam sim no tau dhau los ua cov txheej txheem steel thiab cov chaw tsim khoom, muab ntau yam khoom rau ntau lub tuam txhab tsim kho thiab cov tuam txhab steel qauv thoob ntiaj teb. Ua tsaug rau Yuxin Group txoj kev tshaj lij thiab kev ncaj ncees, nws tau dhau los ua lub ntiaj teb - muaj npe nrov lag luam.
