Yuav ua li cas txiav txim siab sai sai seb puas muaj teeb meem tshwm sim hauv cov khoom siv hlau?
1. Kev tshuaj ntsuam xyuas ua ntej rauv Kev kuaj xyuas ua ntej ntawm lub cub tawg yog ib qho tseem ceeb ntawm nws cov txheej txheem tsim khoom, thiab nws muaj feem cuam tshuam ncaj qha rau qhov zoo ntawm ductile hlau castings. Los ntawm tam sim thiab raug txiav txim rau spheroidization ntawm molten hlau, kev ntsuas tau sai sai los tswj qhov zoo ntawm cov hlau ductile. Kev txiav txim siab tsis raug ua ntej lub cub tawg yuav ua rau ntau tus castings yuav tsum tau muab pov tseg thiab khib nyiab molding teev. Yog li ntawd, kev txiav txim raws sij hawm thiab raug ntawm qhov teeb meem spheroidization ua ntej lub cub tawg yog qhov tseem ceeb tshaj li kev soj ntsuam tom qab cub tawg. Cov txheej txheem feem ntau siv hauv kev tsim khoom tiag tiag los xyuas cov spheroidization ntawm cov hlau molten ua ntej lub cub tawg muaj xws li cov hauv qab no.
1 Txoj hauv kev rau kev txiav txim siab nto crusting thiab nplaim taws Tsis tshua muaj lub ntiaj teb magnesium ductile hlau muaj qis magnesium thiab tsawg lub ntiaj teb cov ntsiab lus. Qhov saum npoo ntawm cov hlau molten yog txawv ntawm cov ntshiab magnesium ductile hlau. Tsis muaj oxide ntau npaum li cas ntawm qhov chaw, thiab cov nplaim taws tsis muaj ntau thiab muaj zog. Txawm li cas los xij, thaum 1/3 ntawm cov hlau molten ntxiv, magnesium lub teeb thiab cov nplaim dawb yuav khiav tawm ntawm cov kua dej, zoo li lub teeb taws tswm ciab. Kev txiav txim ntawm tus mob spheroidization thiab seem ntawm magnesium yog nyob ntawm tus lej thiab qhov siab ntawm cov nplaim taws. Qhov siab dua thiab muaj zog dua cov nplaim taws, qhia tau hais tias zoo spheroidization. Tshwj xeeb tshaj yog thaum pouring, hluav taws tuaj yeem pom los ntawm cov hlau molten. Yog tias qhov siab nce mus txog 25 ~ 50mm, spheroidization yog qhov zoo; Yog tias cov nplaim hluav taws qis dua 15 hli, qhov spheroidization tsis zoo. Kev txiav txim siab los ntawm qhov chaw kho cov hlau molten hlau, yog tias muaj cov oxide zaj duab xis tsim thiab muaj cov xim dawb-dawb dov qhov kaj, nws txhais tau hais tias spheroidization yog qhov zoo. Txawm li cas los xij, yog tias cov oxide zaj duab xis tuab heev, nws txhais tau hais tias qhov kub ntawm cov hlau molten yog tsawg.
2 Triangular test block method Tam sim no, nws yog ib txoj hauv kev siv los txiav txim qhov mob spheroidization los ntawm kev soj ntsuam qhov ntsuas ntsuas. Cov kev sim blocks siv los ntawm ntau lub chaw tsim khoom tuaj hauv ntau cov duab thiab qhov ntau thiab tsawg, thiab feem ntau cov chaw tsim khoom siv cov duab peb sab. Qhov ntu ntu ntu ntawm daim duab peb sab test block yog 12.5mm (hauv qab) Tshem tawm cov hlau molten 200mm hauv qab ntawm qhov chaw thiab hliv rau hauv qhov ntsuas ntsuas thiab txias kom txog thaum nws tsaus liab ua ntej quenching nrog dej. Qhov kev sim thaiv nrog zoo spheroidization muaj ib puag ncig sab nraud thiab loj dua li grey cam khwb cia hlau. Nws muaj lub ntsej muag huv thiab ci ntsa iab thiab feem ntau yog nchuav vertically. Muaj shrinkage ntawm ob sab ntawm daim duab peb sab test block, thiab muaj shrinkage nyob rau sab saum toj los yog ob sab ntawm kab rov tav poured block. Qhov kev sim thaiv spheroidizes zoo tom qab txias thiab tawg. Qhov kev sim thaiv muaj cov xim dawb lossis silvery grey porcelain zoo li tawg, nrog lub ntsej muag dawb thiab nruab nrab Yog tias cov pob txha tawg yog silvery dawb thiab muaj cov qauv radial, tus nqi ntawm tus neeg sawv cev saum npoo ntxiv yog siab dhau thiab ntau carbides yuav yog. ua. Lub sijhawm no, daim ntawv xeem yuav ua rau lub suab "slapping" nkig thaum nws muab tso rau, thiab daim ntawv xeem yuav tawg nrog lub teeb kais, thiab lub qhov ncauj tawm tshiab muaj cov ntxhiab tsw ntawm calcium carbide. Yog li ntawd, nws yog qhov zoo tshaj rau inoculate floating silicon thaum lub sij hawm pouring. Yog hais tias lub pob txha tawg yog silver-grey nrog cov me me dub me me, thiab cov pob txha tawg qhia cov xim muaju, qhov spheroidization ntawm daim duab peb sab tau ua tsis tiav. Ob txoj hauv kev los txheeb xyuas qhov zoo
Lus Cim: 1) Cov ntxhiab tsw ntawm calcium carbide yuav khiav tawm tam sim tom qab daim duab peb sab nrog zoo spheroidization tawg los ntawm quenching dej. 2) Qhov tob tob tob yog cuam tshuam rau hom thiab hom ntawm cov hlau ductile thiab muaj pes tsawg leeg ntawm cov hlau molten. Yog li ntawd, tsis muaj cov ntaub ntawv muab rau hauv lub rooj. Qhov tob tob ntawm lub ntiaj teb tsis tshua muaj magnesium ductile hlau tsis pom tseeb heev.
3 Kev txiav txim ntawm cov txheej txheem pouring (1) Tom qab cov hlau molten hlau yog poured rau hauv pwm, yog hais tias lub khob sprue tau recessed downwards thiab nto yog heev du, nws qhia tau hais tias zoo spheroidization; Yog hais tias muaj ib lub plhaub tawv nyob rau sab sauv ntawm lub khob sprue, nws tseem yuav tsum tau Shrinkage qhia tias qhov kub ntawm cov hlau molten yog tsawg. (2) Thaum lub sij hawm pouring txheej txheem, lub round ca hlau taum splashed rau saum npoo ntawm cov xuab zeb pwm muaj pits (pits), qhia zoo spheroidization.
4. Tom qab cov txheej txheem kev txheeb xyuas ntug dub tiav lawm, siv ib rab diav coj mus ncuav ib qho kev sim thaiv nrog lub thickness ntawm li 10 hli, thiab txias nws kom tsaus liab. Tom qab quenching thiab tawg, yog hais tias ib tug dub ntug pom nyob rau saum npoo ntawm lub xeem thaiv, nws txhais tau tias tsis zoo spheroidization thiab xim dub. Qhov tuab ntawm ntug, qhov phem tshaj qhov spheroidization thiab kev lag luam. Nyob rau lub sijhawm no, yog tias qhov kub ntawm cov hlau molten yog siab, ntxiv alloy tuaj yeem ntxiv. Nws kuj tseem tuaj yeem pom los ntawm qhov kev sim thaiv: yog tias qhov ntsuas thaiv yog nyob ib puag ncig los ntawm cov duab arc, nrog kev nyuaj siab nyob rau hauv nruab nrab, thiab qee qhov muaj wrinkles, nws kuj txhais tau hais tias lub spheroidization yog qhov zoo; Yog tias muaj cov ntsiab lus zoo li cov nplej nyob rau saum npoo ntawm qhov ntsuas qhov ntsuas, nws txhais tau tias cov kua hlau yog oxidized thiab nws yuav lwj. Hauv qhov no, lub qhov cub yuav tsum tau hloov kho.
5. Saib xyuas qhov solidification ntawm cov hlau molten. Tom qab kev kho mob spheroidization tiav, tshem tawm ib qho me me ntawm cov hlau molten thiab hliv rau hauv Ф30mm cylindrical hlau pwm. Saib xyuas qhov tshwm sim ntawm molten hlau gushing tawm ntawm qhov chaw thaum lub sij hawm solidification, thiab txiav txim lub spheroidization ntawm molten hlau raws li tus nqi ntawm molten hlau gushing tawm. Qhov xwm txheej. Lub molten hlau nrog zoo spheroidization qhia tau hais tias ib tug loj graphite expansion quab yuam thaum solidification. Qhov saum npoo ntawm cov hlau molten poob me ntsis thaum pib ntawm solidification, thiab ib tug me me ntawm cov hlau molten gushes tawm ntawm qhov chaw tom qab lub nto yog crusted; thaum lub molten hlau nrog tsis zoo spheroidization Lub nto gushing kom muaj nuj nqis yog me me.
6. Ceev ceev metallographic soj ntsuam nyob rau hauv pem hauv ntej ntawm lub cub tawg. Cov txheej txheem ntau yam uas tau hais los saum toj no txhua tus siv qee yam ntawm cov hlau ductile los txiav txim ncaj qha rau spheroidization. Txawm li cas los xij, ntau yam kev tsim khoom hloov pauv zoo heev, thiab cov txheej txheem saum toj no muaj kev txwv. Kev soj ntsuam sai ntawm metallographic nyob rau hauv pem hauv ntej ntawm lub cub tawg tuaj yeem zam kev cuam tshuam ntawm ntau yam thiab ncaj qha saib xyuas qhov xwm txheej spherification.
2. Tom qab lub cub tawg metallographic tshuaj xyuas (1) Tom qab qhov cub metallographic tshuaj xyuas feem ntau saib xyuas microstructure xws li graphite morphology thiab sub-tus yam ntxwv hlau matrix qauv inclusions, thiab lwm yam. Los ntawm kev tshuaj ntsuam metallographic, tus naj npawb ntawm cov khoom tawg tuaj yeem hloov tau los txhim kho qhov zoo ntawm casting. thiab lub hauv paus ruaj khov. (2) Cov tshuaj muaj pes tsawg leeg tsom xam ntawm lub ntiaj teb tsis tshua muaj magnesium ductile hlau kuj tuaj yeem hais tias yog ib txoj kev tshawb nrhiav. Yog tias pom muaj teeb meem, cov neeg ua haujlwm batching tuaj yeem hloov kho kom tsim nyog kom tsis txhob muaj teeb meem loj. Tsis tas li ntawd, muaj cov khoom siv kho tshuab kuaj thiab tsis muaj kev puas tsuaj ntawm cov hlau hlau castings.
3. Xaus Kev tshawb pom ntawm cov hlau nplaum yuav tsum tau hloov cov kev tshawb nrhiav ib txwm siv ntawm "kev tsom xam tom qab cub tawg" rau hauv "kev tshawb nrhiav hauv online." Raws li kev lag luam loj thiab nruab nrab, siv cov txheej txheem tshawb nrhiav qib siab hauv tsev thiab txawv teb chaws kom raug txiav txim siab qhov xwm txheej spheroidization yog qhov kev lees paub zoo rau kev txhim kho qhov zoo ntawm castings. . Txawm li cas los xij, rau cov tuam txhab me me, nws tseem yog qhov tseem ceeb ntawm kev siv qee yam ntxwv ntawm cov hlau hlau los txiav txim ncaj qha rau qhov xwm txheej spheroidization.
