Siab -Speed ​​Steel Ua Hlau Txhaj Moulded?

Cov lus teb luv luv yog yog, tab sis cov txheej txheem xav tau qhov tseeb uas cais cov chaw paub txog MIM los ntawm tus so. Siab- cov cuab yeej ceev xws li M2, M4, T15, thiab M42 tau ua tiav zoo los ntawm kev txhaj tshuaj molding txij li xyoo 1990, tom qab ntau xyoo ntawm kev loj hlob hauv cov hmoov metallurgy. Cov thev naus laus zis tso cai rau cov tuam txhab tsim cov cuab yeej txiav nyuaj, cov cuab yeej muaj tseeb, thiab hnav- cov khoom tiv thaiv uas yuav xav tau kev siv ntau yam los ntawm wrought bar Tshuag.

 Vim li cas ho xav txog MIM rau Siab -Speed ​​Steel?

Cov tsoos ingot casting ntawm cov cuab yeej steels tsim kev sib cais thaum lub sij hawm solidification, ua rau cov carbide loj precipitates uas tsim longitudinal striations thaum kub ua hauj lwm. Xyoo 1960, cov kws tshawb fawb ntawm Crucible Steel tau pom tias atomizing cov cuab yeej hlau ua hmoov thiab sib sau ua ke ntawm kub isostatic nias (HIP) tuaj yeem tshem tawm qhov kev sib cais tag nrho. Qhov tshwm sim microstructure pom cov carbides zoo dispersed nrog kev txhim kho toughness piv rau cov khoom cam khwb cia ntawm cov khoom sib xws.

Kev txhaj tshuaj hlau yuav siv qhov no ntxiv los ntawm kev ua kom ze rau -net- cov duab tsim ntawm geometry uas yuav ua rau lub tshuab tsis zoo. ABIS Mould Technology tau siv lub peev xwm no thoob plaws cov haujlwm uas yuav tsum tau ua kom nyuaj siab -cov khoom siv tawv tawv, tshwj xeeb tshaj yog hauv tsheb, aerospace, thiab kev siv cuab yeej cuab tam. Thaum ib tus neeg siv khoom Lavxias tuaj xyuas peb lub chaw Shenzhen hauv xyoo 2023 los ntsuas MIM cov kab ntau lawm, kev sib tham tau ua tiav ntawm qhov no: MIM tuaj yeem xa M4 thiab T15 qhov chaw nrog qhov ntom ntom ntau tshaj 96% ntawm theoretical, hardness values ​​ncav cuag 63-65 HRC tom qab kev kho cua sov, thiab qhov seem rov ua dua thoob plaws ntau lawm.

 Sintering Qhov rai

Qhov teeb meem tseem ceeb nrog siab -ceev steel MIM yog nyob rau hauv qhov kev lag luam hu ua "sintering qhov rais"- qhov kev tso cai ntawm qhov kub thiab txias uas tsim kom muaj qhov ntom ntom uas tsis ua rau cov txheej txheem microstructural degradation. Rau M2 steel ntawm 0.85% cov ntsiab lus carbon, lub qhov rais no yog kwv yees li 13℃(los ntawm 1245℃txog 1258 degree). Sab nraum qhov no, txawm tias tsis txaus densification tshwm sim los yog cov kua theem ntau dhau ntawm cov ciam teb, tsim cov yeeb yaj kiab carbide uas ua haujlwm raws li txoj kev tawg ntawm kev thauj mus los.

Qhov kev ua siab ntev nqaim no yuav tsum muaj lub tshuab hluav taws xob nrog ntau - cheeb tsam qhov kub thiab txias tswj thiab kev tswj hwm huab cua. ABIS ua haujlwm lub tshuab nqus tsev sintering khoom nrog graphite-kab kub zones uas tswj cov pa roj carbon qhov tsim nyog los tiv thaiv decarburization. Peb cov txheej txheem ISO 9001 thiab IATF 16949 daim ntawv pov thawj tswj cov ntaub ntawv ntawm sintering profiles rau txhua qhov ntau lawm, nrog rau cov ntsiab lus pov thawj ntawm cov qauv ntawm txhua pawg.

T15 steel nthuav qhia me ntsis kev zam txim ntau dua. Cov ntsiab lus vanadium siab dua (kwv yees li 4.6%) tsim MC-hom carbides uas ua raws li cov qoob loo ciam teb pinning tus neeg sawv cev thaum sintering. Kev tshawb fawb luam tawm los ntawm Kar et al. (1993) tau pom tias T15 tuaj yeem sintered hla qhov kub ntawm 55℃hauv nitrogen-hydrogen atmospheres, piv rau tsawg dua 20℃rau M2 nyob rau hauv cov xwm txheej zoo sib xws. Thaum cov neeg siv khoom xav tau qhov siab tshaj plaws hnav tsis kam rau cov ntawv thov xws li txiav cov ntxig lossis tsim cov tuag, peb feem ntau pom zoo T15 rau nws cov txheej txheem ruaj khov ntau npaum li nws cov khoom siv kho tshuab.

 Cov khoom lag luam thiab kev txiav txim siab

Gas- atomized siab- ceev steel hmoov coj zoo ib yam li 316L thiab 17-4PH stainless hlau hauv kev npaj feedstock. Yam D90 qhov tseem ceeb ntawm 18-24 μm tso cai rau cov khoom thauj khoom ntawm 60-67% los ntawm ntim nrog siv quav ciab-polymer lossis polyacetal-based binder systems. Lub spherical morphology ntawm cov roj-atomized hais ua rheological yam ntxwv haum rau nyias-phab ntsa txhaj nrog tsawg jetting los yog weld kab tsim.

Debinding nthuav tawm qhov kev sib tw tseem ceeb tshaj plaws ntawm kev tswj cov pa roj carbon. Ntshiab hydrogen atmospheres ua rau decarburization, thaum inert cua tuaj yeem ua rau cov pa roj carbon monoxide tsis tiav los ntawm kev ua tsis tiav binder burnout. Kev lag luam kev coj ua tau sib koom ua ke ntawm cov huab cua sib xyaw ntawm 5-25% hydrogen hauv nitrogen, txawm tias qee qhov chaw siv CO / CO₂ lossis CH₄ / H₂ cov khoom sib xyaw thaum lub sij hawm presintering rau kev tswj cov pa roj carbon ntau dua. Thermogravimetric tsom xam ntawm binder decomposition nyob rau hauv qhov chaw tsim khoom tseem tseem ceeb rau kev txiav txim siab qhov tsim nyog thermal profiles.

 Kev kho cua sov thiab cov cuab yeej kawg

MIM siab-ceev steel qhov chaw tuaj yeem kho cua sov siv tib yam li cov khoom siv ua tiav. Kev kho ntsev da dej ntawm 1177-1205℃tom qab quenching rau 579-593℃ua kom muaj kev hloov pauv mus rau martensite. Muab ob npaug los yog triple tempering ntawm 538-566℃txo qis austenite thiab ua kom tawv tawv.

 Kev siv tswv yim

Kev lag luam tsim khoom ntawm MIM siab -ceev steel nyiam nruab nrab- mus rau - cov ntawv thov ntim siab nrog cov geometry nyuaj. Ntawm 2023 Chinaplas exhibition nyob rau hauv Shenzhen, qhov twg ABIS qhia peb precision manufacturing kev daws teeb meem, ntau tus neeg tuaj koom nug tshwj xeeb txog MIM cov cuab yeej cuab tam rau automated los ua ke cov cuab yeej. Cov ntawv thov no feem ntau koom nrog cov khoom me me (hauv qab 50 grams) nrog cov yam ntxwv zoo li cov cua txias sab hauv, cov kab hauv qab, lossis cov ntu nyias uas yuav xav tau ntau yam kev ua haujlwm los ntawm cov khoom lag luam.

Cov ntawv thov kev lag luam tam sim no suav nrog micro laum cov khoom siv rau kev tsim khoom siv hluav taws xob, saib cov khoom uas xav tau ob qho tib si zoo nkauj thiab hnav tsis kam, thiab cov iav precision rau cov khoom siv kho mob qhov twg 17-4PH stainless hlau tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua. Cov khoom siv tus nqi kim tshaj stainless hlau MIM yog offset los ntawm kev txo qis machining thiab tshem tawm cov cuab yeej kim steels uas yuav txwv tsis pub mus ua chips.