Lub qhov dej castingYog tias raug pov rau hauv lub valve, qhov ntsuas siab ntawm lub valve feem ntau tsis tshua muaj (xws li PN16, PN25, PN40, tab sis kuj muaj qhov siab siab, tuaj yeem ncav cuag 1500LD, 2500LB), feem ntau ntawm cov caliber yog ntau dua DN50.Forging li qubraug forged tawm. Lawv feem ntau yog siv rau hauv cov kav dej qib siab. Lub caliber yog me me, thiab lawv feem ntau yog qis dua DN50.
A, casting
1. Kev ua pwm: nws yog cov txheej txheem ntawm kev yaj hlau rau hauv cov kua uas ua tau raws li qee yam kev cai thiab nchuav nws rau hauv pwm pwm. Tom qab txias thiab khov, qhov kev ua pwm (qhov chaw lossis dawb paug) tau txais nrog cov duab, qhov loj me thiab kev ua tau zoo uas tau txiav txim siab ua ntej. Cov thev naus laus zis yooj yim ntawm kev lag luam tsim khoom siv niaj hnub.
2, tus nqi tsim khoom ntawm cov khoom seem yog qis, rau cov duab nyuaj, tshwj xeeb tshaj yog nrog cov qhov sib txawv, ntau dua tuaj yeem qhia nws txoj kev lag luam; tib lub sijhawm, nws muaj kev hloov pauv dav thiab cov khoom siv kho tshuab zoo.
3, tab sis cov ntaub ntawv xav tau rau kev tsim khoom casting (xws li hlau, ntoo, roj, cov ntaub ntawv molding, thiab lwm yam) thiab cov khoom siv (xws li lub cub tawg metallurgical, tshuab sib tov xuab zeb, tshuab molding, tshuab ua lub hauv paus, shaker, tshuab tua blasting, phaj hlau cam khwb cia, thiab lwm yam) ntau dua, thiab yuav tsim cov hmoov av, cov pa phem thiab suab nrov thiab ua rau ib puag ncig puas tsuaj.
4. Kev ua hlau kub yog ib hom kev siv tshuab ua haujlwm kub uas muaj keeb kwm txog li 6000 xyoo. Xyoo 3200 BC, kev ua cov qav tooj liab tau tshwm sim hauv Mesopotamia. Nruab nrab ntawm xyoo pua 13 BC thiab 10 BC, Tuam Tshoj tau nkag mus rau hauv lub sijhawm zoo tshaj plaws ntawm kev ua tooj liab, cov txheej txheem tau mus txog qib siab, xws li Shang Dynasty Simuwu square Ding hnyav 875 kg, Warring States Dynasty Jinghou Yi Zunpan thiab Western Han Dynasty daim iav pob tshab yog cov khoom sawv cev ntawm kev ua hlau thaum ub. Kev ua hlau thaum ntxov tau cuam tshuam los ntawm cov tais diav av nplaum, thiab feem ntau ntawm cov kev ua hlau yog cov cuab yeej lossis cov khoom siv rau kev ua liaj ua teb, kev ntseeg, lub neej thiab lwm yam, nrog rau xim zoo nkauj. Xyoo 513 BC, Tuam Tshoj tau tsim thawj cov hlau cam khwb cia hauv cov ntaub ntawv sau hauv ntiaj teb - Jin Casting Ding (kwv yees li 270 kg). Nyob ib ncig ntawm xyoo pua 8, Tebchaws Europe tau pib tsim cov hlau cam khwb cia. Tom qab kev hloov pauv kev lag luam hauv xyoo pua 18, kev ua hlau tau nkag mus rau lub sijhawm tshiab ntawm kev pabcuam kev lag luam loj. Nyob rau hauv lub xyoo pua 20th, kev loj hlob sai ntawm kev casting, tau tsim cov hlau ductile, malleable cast iron, ultra-low carbon stainless hlau thiab txhuas tooj liab, txhuas silicon, txhuas magnesium alloy, titanium puag, nickel puag alloy thiab lwm yam khoom siv hlau casting, thiab tau tsim ib txoj kev tshiab rau grey cast iron los ua cov khoom kho. Tom qab xyoo 1950, cov thev naus laus zis tshiab xws li xuab zeb ntub siab molding, tshuaj hardening xuab zeb molding, core making, negative pressure molding, thiab lwm yam tshwj xeeb casting thiab txhaj tshuaj blasting tau qhia.
5. Muaj ntau hom kev casting. Raws li txoj kev ua qauv, nws feem ntau muab faib ua 0 xuab zeb casting, suav nrog hom xuab zeb ntub, hom xuab zeb qhuav thiab hom xuab zeb tawv 3. (2) casting tshwj xeeb, nias molding cov ntaub ntawv thiab tuaj yeem muab faib ua xuab zeb ntuj tsim ua cov ntaub ntawv casting tshwj xeeb tseem ceeb (piv txwv li, kev nqis peev casting, pwm casting, plhaub pwm casting foundry, negative pressure casting, pwm casting, ceramic pwm casting, thiab lwm yam) thiab hlau ua cov ntaub ntawv pwm tseem ceeb ntawm kev casting tshwj xeeb (xws li hlau pwm casting, siab casting, txuas ntxiv casting, qis siab casting, centrifugal casting, thiab lwm yam).
6, cov txheej txheem casting feem ntau suav nrog: (casting (thawv) ua cov kua hlau khov kho casting, casting raws li cov ntaub ntawv tuaj yeem muab faib ua xuab zeb pwm, hlau, ceramic, av nkos, graphite, thiab lwm yam, tuaj yeem faib ua pov tseg, semi-permanent thiab tas mus li hom, qhov zoo ntawm kev npaj pwm yog cov yam tseem ceeb uas cuam tshuam rau qhov zoo ntawm casting; Kev yaj thiab nchuav ntawm casting hlau, casting hlau (casting alloy) feem ntau suav nrog cam khwb cia hlau, cam khwb cia hlau thiab cam khwb cia tsis yog hlau alloy; (3) casting kev kho mob thiab kev tshuaj xyuas casting, casting kev kho mob, suav nrog kev tshem tawm cov tub ntxhais thiab casting nto txawv teb chaws, casting riser tshem tawm, shovel sib tsoo burr thiab lwm yam protrusion, kev kho cua sov, shaping, antirust kho thiab rough machining. Inlet twj tso kua mis valve
Qhov thib ob forging
1, forging: yog kev siv cov tshuab forging rau ntawm cov hlau billet siab, yas deformation kom tau txais qee yam khoom siv kho tshuab, qee yam duab thiab qhov loj ntawm cov forgings ua txoj kev.
2, ib qho ntawm ob lub ntsiab lus tseem ceeb ntawm kev forging. Los ntawm kev forging tuaj yeem tshem tawm cov hlau raws li cov hlau cam khwb cia, qhov vuam qhov, cov khoom siv kho tshuab ntawm kev forgings feem ntau zoo dua li cov khoom siv castings tib yam. Rau cov khoom tseem ceeb nrog kev thauj khoom siab thiab kev ua haujlwm hnyav hauv tshuab, kev forgings feem ntau siv ntxiv rau lub phaj, profile lossis vuam qhov nrog cov duab yooj yim uas tuaj yeem dov.
3, forging raws li txoj kev tsim khoom tuaj yeem muab faib ua: 0 qhib forging (free forging). Siv lub zog lossis siab los ua kom cov hlau ntawm ob sab saud thiab sab qis tiv thaiv hlau (anvil block) deformation kom tau txais cov forgings xav tau, feem ntau yog phau ntawv forging thiab mechanical forging. ② Kaw hom forging. Cov hlau dawb paug yog deformed nyob rau hauv siab hauv lub forging tuag chamber ntawm ib qho duab, thiab forging tuaj yeem muab faib ua tuag forging, txias forging, rotary forging, extrusion thiab lwm yam. Raws li qhov kub deformation, forging tuaj yeem muab faib ua kub forging (qhov kub ua tiav siab dua qhov kub recrystallization ntawm cov hlau dawb paug), sov forging (qis dua qhov kub recrystallization) thiab txias forging (qhov kub ib txwm).
4, cov khoom siv forging feem ntau yog ua los ntawm ntau yam khoom siv xws li carbon steel thiab alloy steel, ua raws li txhuas, magnesium, titanium, tooj liab thiab nws cov alloy. Lub xeev qub ntawm cov khoom siv suav nrog cov pas nrig, cov saw hlau casting, hmoov hlau thiab cov hlau ua kua. Qhov piv ntawm thaj tsam hla ntawm cov hlau ua ntej deformation rau thaj tsam tom qab deformation hu ua forging ratio. Kev xaiv forging kom raug yog qhov zoo dua los txhim kho cov khoom zoo, txo tus nqi muaj kev sib raug zoo heev.
Lub sijhawm tshaj tawm: Lub Rau Hli-01-2021