Thaum cov neeg feem coob hnov 'stainless steel', lawv pom lub ci ntsa iab, tsis muaj dej hauv chav ua noj. Qhov ntawd yog thawj qhov kev xav tsis zoo. Qhov tseeb tiag, nws yog tsev neeg ntawm cov alloys, thiab xaiv qhov tsis ncaj ncees lawm qib rau daim ntawv thov yog qhov yuam kev kim heev uas kuv tau pom ntau zaus. Nws tsis yog hais txog corrosion kuj; nws yog hais txog machinability, weldability, thiab yuav ua li cas nws coj nyob rau hauv kev ntxhov siab los yog kub. Cia peb tham txog dab tsi cov nplooj ntawv spec tsis ib txwm qhia rau koj.
Lub Alloy tsis yog tag nrho zaj dab neeg
Siv 304 thiab 316, cov neeg ua haujlwm. Txhua tus paub tias 316 muaj molybdenum kom zoo dua pitting tsis kam hauv chlorides. Tab sis nyob rau hauv lub khw hauv pem teb, qhov mob taub hau loj dua nrog 316 yog nws txoj kev nyiam ua haujlwm-nrhiav zoo li vwm thaum lub sijhawm CNC machining. Koj xav tias koj tau txais koj cov khoom noj thiab nrawm nrawm, thiab mam li nco dheev lub cuab yeej yog qw, qhov chaw tiav mus rau ntuj txiag teb tsaus, thiab koj nyob nraum nrog ib tug hardened, gummy mess. Nws xav tau kev hwm thiab cov cuab yeej ntse, ntau dua li 304. Rau lub tuam txhab nyiam Qingdao Qiangsenyuan Technology Co., Ltd. (QSY), uas tswj txhua yam ntawm casting mus rau qhov kawg machining, qhov no tsis yog kev kawm. Nws txhais tau hais tias npaj tag nrho cov txheej txheem - pib nrog cov txheej txheem casting - nyob ib ncig ntawm yuav ua li cas cov khoom yuav raug txiav tom qab.
Tom qab ntawd muaj cov qib dawb-machining, 303. Nws tau txais sulfur ntxiv, yog li nws chips zoo nkauj. Tab sis tib yam sulfur tua nws cov corrosion kuj thiab weldability. Kuv ib zaug pom ib pawg ntawm 303 lub cev lub cev, ua kom zoo kawg nkaus, ua tsis tiav ntxov hauv ib puag ncig me me vim tias ib tus neeg xav tias stainless yog stainless. Tus neeg siv xav tau 316, tab sis 303 yog pheej yig dua thiab yooj yim dua rau tshuab. Qhov kev txuag lub sij hawm luv luv no ua rau muaj txiaj ntsig hauv kev hloov pauv thiab lub koob npe nrov. Nws yog ib qho cuab yeej classic.
Qhov tseeb nuance tuaj nrog cov nag lossis daus-qib qib zoo li 17-4 PH. Koj tshuab nws nyob rau hauv cov kev daws teeb meem-kho mob A, uas yog tus mos mos. Tom qab ntawd koj kub-kho nws mus rau H900 lossis H1150 kom tau txais lub zog zoo kawg. Tab sis yog tias koj qhov machining ib ntus tsis suav rau qhov hloov pauv ntawm qhov kev kho cua sov zaum kawg - thiab nws yuav hloov - koj qhov kev ua siab ntev aerospace bracket yuav tawg. Nws yog ib qho kev seev cev ntawm tus kws kho tshuab thiab cov metallurgist.
Casting It Right: Ntau tshaj li Pouring Hlau
Qhov no yog qhov uas lub hauv paus yog pw. Kev nqis peev casting yog zoo heev rau complex stainless hlau qhov chaw, tab sis dab ntxwg nyoog nyob rau hauv cov ntsiab lus. Gating thiab riser tsim yog qhov tseem ceeb. Stainless hlau muaj qhov sib txawv shrinkage qauv dua li carbon steel. Yog hais tias koj siv tib lub feeder system, koj yuav tau txais shrinkage porosity nyob rau hauv tuab seem. Peb kawm qhov no thaum ntxov ntawm QSY. Lub twj tso kua mis vaj tse casting ua tsis tau cov kev ntsuas siab. Lub geometry yog suab, cov ntawv pov thawj alloy tau zoo meej. Qhov teeb meem yog qhov riser me me dhau lawm thiab nyob rau hauv qhov tsis ncaj ncees lawm, starving lub casting raws li nws solidified. Rov tsim kho qhov kev noj zaub mov daws nws. Nws tsis yog cov khoom tsis ua haujlwm; nws yog ib qho kev ua tsis tiav.
Plhaub pwm casting rau stainless qhia lwm qhov sib txawv: hlau-pwm cov tshuaj tiv thaiv. Qee cov alloys, tshwj xeeb tshaj yog cov uas muaj chromium siab, tuaj yeem tsim ib qho nyuaj, tenacious burn-on txheej uas hlau hu rau lub plhaub ceramic. Qhov no tsis yog qhov ntsuas koj tuaj yeem tawg tawm; nws yog metallurgical daim ntawv cog lus. Yog tias nws hnyav dhau lawm, nws ua rau lub ntsej muag puas tsuaj thiab yuav tsum tau them nyiaj ntau dhau rau kev siv tshuab, tshuab tus nqi. Qhov ua kom yuam kev yog nyob rau hauv pwm lub ntsej muag lub tsho-qhov tshwj xeeb zircon hmoov los yog refractory siv-thiab lub ncuav kub. Ob peb degrees kub dhau lawm, thiab koj tab tom yuav koj tus kheej hnub ntawm kev sib tsoo ntxiv.
Thiab cia peb tsis txhob hnov qab cov alloys tshwj xeeb QSY hais txog, zoo li cov nickel-based. Feem ntau, koj tsis yog casting stainless nkaus xwb; koj nyob nraum Cast Inconel lossis Hastelloy nrog nws. Cov kev coj ua rau lub cub tawg yuav tsum ua kom tsis txhob muaj kev sib kis. Ib kab ntawm carbon steel residue nyob rau hauv ib lub ladle tuaj yeem qhia cov hlau carbides rau hauv superalloy yaj, cuam tshuam nws cov khoom kub. Lub logistics nyob rau hauv ib tug ntau yam khoom foundry yog ib qho tseem ceeb raws li cov metallurgy.
Machining Reality: Sib tham, cua sov, thiab cuab yeej lub neej
Los ntawm kev casting, machining Tshuag tsis tshua muaj sib xws. Tej zaum koj yuav muaj cov xuab zeb-blasted nto nrog hnab ris ntawm cov nplai nyuaj. Koj thawj roughing pass yuav tsum nruj txaus kom tau nyob rau hauv no inconsistent nto txheej tab sis ruaj txaus tsis txhob poob rau lub cuab tam. Rau loj castings, clamping thiab fixturing kom tsis txhob distortion nyob rau hauv txiav quab yuam yog ib daim duab kos duab. Koj tsis machining ib tug zoo meej billet; koj tab tom ntxuav ib qho ze-net-zoo ib feem uas muaj kev ntxhov siab sab hauv los ntawm cov txheej txheem casting.
Kev xaiv coolant tseem ceeb heev. Lub hom phiaj dav dav dav dav yuav zoo rau txhuas lossis hlau me me, tab sis rau stainless hlau, koj xav tau lub siab lubrication. Lub hom phiaj tsis yog txias xwb; Nws yog los txo qhov tsim-up ntug ntawm lub cuab yeej taw qhia, uas yog thawj qhov ua rau tsis zoo thiab cov cuab yeej siv ceev ceev hauv cov khoom siv gummy. Peb tau hloov mus rau qhov tshwj xeeb hnyav, tsis muaj chlorine-dawb hluavtaws hluavtaws xyoo dhau los, thiab lub neej cuab yeej ntawm peb txoj haujlwm 316 tau nce los ntawm tej zaum 30%. Nws yog qhov tseem ceeb.
Tom qab ntawd muaj kev ntxhov siab tom qab ua haujlwm. Hnyav milling lossis tig tuaj yeem ua rau muaj kev ntxhov siab ntawm qhov chaw uas, nyob rau hauv ib puag ncig kev pabcuam corrosive, ua cov ntsiab lus pib rau kev ntxhov siab corrosion tawg (SCC). Rau qhov chaw uas tau muab rau cov nroj tsuag tshuaj los yog siv offshore, qhov kawg passivation lossis txawm tias qhov kub thiab txias txias yuav tsum tau ua. Nws tsis yog nyob ntawm tus qauv kos duab, tab sis nws yog hom kev paub txog txheej txheem uas cais lub khw ua haujlwm los ntawm tus khub tsim khoom tiag.
Thaum Stainless Tsis txhais tau tias Stain-dawb
Qhov no yog qhov loj tshaj ntawm cov neeg siv kev kawm point. Passivation yog yuav tsum tau. Nws tsis yog ib qho kev xaiv polish. Nws yog cov txheej txheem tshuaj uas tshem tawm cov hlau tsis pub dawb nyob rau hauv qhov chaw los ntawm kev ua haujlwm (xav txog cov khoom me me ntawm cov cuab yeej hlau nias rau hauv ib feem) thiab ua kom cov chromium oxide txheej. Yog tias koj hla nws, qhov ci ntsa iab yuav tsim cov kab xeb hauv cov khoom lag luam ntub, thiab lub xov tooj yuav nrov nrog cov neeg siv khoom npau taws. Kuv yuav tsum tau piav qhia qhov no ntau zaus dua li kuv suav tau.
Corrosion kuj yog hais txog kev tsim. Crevices yog tus yeeb ncuab. Lub tshuab zoo nkauj flange uas sib koom nrog lwm qhov chaw nrog lub gasket tuaj yeem tsim kom muaj qhov nruj nruj. Nyob rau hauv qhov chaw oxygen-depleted, txawm tias 316 tuaj yeem raug kev puas tsuaj crevice. Txoj kev daws teeb meem yuav yooj yim raws li kev qhia txog cov khoom siv gasket sib txawv lossis lub ntsej muag dav dua. Nws yog hais txog kev xav ntawm stainless hlau tivthaiv raws li ib feem ntawm ib tug system, tsis yog ib qho kev sib cais ntawm cov hlau.
Thiab kub tint los ntawm vuam. Cov xim zaj sawv ntawd tsis yog dab tuag xwb; nws yog thaj chaw uas cov chromium tau depleted, ua rau nws raug corrosion. Rau kev huv lossis kev siv dej hiav txwv, cov xim ntawd yuav tsum tau muab tshem tawm, feem ntau yog los ntawm pickling thiab passivation. Ib tug welder yuav tsim ib tug zoo meej TIG weld, tab sis yog hais tias lub tshav kub input tsis tswj thiab sab nraum qab tsis purged zoo, koj twb tsim ib tug yav tom ntej tsis ua hauj lwm point. Kev tswj kom zoo yuav tsum tau saib dhau ntawm X-ray rau qhov tsis xws luag thiab saib cov metallurgy ntawm qhov chaw.
Tus nqi ntawm tus khub ua haujlwm puv
Qhov no yog qhov uas tus qauv ntawm lub tuam txhab xws li QSY, nrog 30 xyoo nyob rau hauv casting thiab machining, ua rau kev txiav txim zoo. Cov teeb meem kuv tau piav qhia yog qhov systemic. Ib qho teeb meem casting yuav tsis tshwm sim txog thaum kawg machining dhau, nkim tag nrho cov nqi ntxiv. Lub tswv yim machining uas tsis quav ntsej qhov casting qhov kev ntxhov siab yuav ua rau muaj kev cuam tshuam. Muaj ob qho kev qhuab qhia nyob rau hauv ib lub ru tsev tso cai rau cov lus tawm tswv yim uas tsis muaj kev poob thaum koj outsource casting rau ib tus neeg muag khoom thiab ua haujlwm rau lwm tus.
Lawv tuaj yeem txiav txim siab ntxov. Piv txwv li, qhov seem geometry hauv 17-4 PH yuav yog npau suav phem rau tshuab los ntawm cov khoom thaiv. Cia peb nqis peev pov nws mus rau 90% net zoo li, txawm tias tus nqi cuab yeej siab dua, vim tias tag nrho cov nqi ntawm cov tswv cuab - cov khoom siv pov tseg, lub sijhawm ua haujlwm, cov cuab yeej hnav - yuav qis dua. Qhov ntawd yog kev txiav txim hu xov tooj yug los ntawm kev ua ob sab ntawm qhov sib npaug.
Nws kuj tsim cov khoom siv intuition. Lawv pab neeg nrhiav pom paub tias qhov tshwj xeeb ntawm 304 los ntawm Tus Neeg Siv Khoom A nyiam ua kua dej ntau dua li ntawm Tus Neeg Siv Khoom B, uas yuav cuam tshuam rau pwm sau. Lawv pab pawg machining paub tias bar Tshuag los ntawm Mill C ib txwm zoo li muaj qhov hnyav dua. Qhov kev paub tsis meej no, tau sau ntau xyoo lawm, yog qhov koj tab tom yuav tiag tiag. Nws tsis yog ib daim ntawv teev muaj peev xwm zoo li plhaub molding thiab CNC machining; nws yog qhov sib sau ua ke, qee zaum mob, kev paub txog kev ua cov txheej txheem ua haujlwm ua ke ntawm cov ntaub ntawv nyuaj. Qhov ntawd yog dab tsi hloov stainless hlau los ntawm cov khoom lag luam mus rau hauv kev daws teeb meem.
