Peeling Tshuab Kho Rocker Dej iav peev Casting

Khoom Taw Qhia

Peeling tshuab hloov rocker dej iav peev casting yog qhov tseem ceeb ntawm lub tshuab peeling. Raws li lub npe qhia, nws yog tsim los ntawm peev casting siv dej iav ua cov khoom molding. Qhov no ua kom muaj qib siab ntawm precision thiab durability.

Dej iav Investment Manufacturing
Tus nqi ntawm cov dej iav binder yog tsawg thiab lub plhaub ua lub voj voog yog luv, yog li cov dej iav plhaub precision casting txheej txheem yog dav siv nyob rau hauv Suav teb, tab sis piv nrog cov tsoos xuab zeb casting, cov dej iav plhaub peev casting tseem muaj teeb meem ntawm kim. cov ntaub ntawv, cov txheej txheem nyuaj thiab lub voj voog ntau lawm ntev. Raws li ib qho ntawm cov tseem ceeb tshaj plaws cuam tshuam rau qhov zoo ntawm castings, nws yog ib qho tseem ceeb heev kom tswj tau qhov zoo ntawm lub plhaub.
Daim ntawv no yuav tham txog kev tswj cov plhaub-ua raw cov ntaub ntawv, lub plhaub-ua ib puag ncig thiab lub plhaub-ua txheej txheem tswj thiab tswj, thiab tib lub sijhawm ua ke nrog kev xyaum tsim khoom, txhawm rau txhim kho cov plhaub zoo, thiab thaum kawg txhim kho qhov zoo. thiab yield ntawm castings.
1. Kev xaiv thiab tswj cov khoom siv raw
1.1 Kev tswj xyuas zoo ntawm cov iav dej khov
Kev nqis peev casting siv sodium dej iav. Qhov kev ua haujlwm tseem ceeb ntawm cov iav dej yog modulus (M), qhov ntom ntom (ρ) thiab viscosity, cov M yog qhov tseem ceeb ntawm cov iav dej, uas tuaj yeem qhia los ntawm cov qauv hauv qab no. M=ω(SiO2)/ω(Na2O) × 1.032, qhov twg ω(SiO2) thiab ω(Na2O) yog cov loj feem ntawm SiO2 thiab Na2O, feem, qhia raws li %, thiab 1.032 yog qhov piv ntawm cov txheeb ze molecular hnyav ntawm Na2O rau SiO2.
Cov iav dej ntom ntom ρ indirectly qhia qhov concentration ntawm Na2O.mSiO2 hauv nws. M nyob ntawm cov ntsiab lus txheeb ze ntawm SiO2 thiab Na2O, thiab ρ txiav txim siab cov ntsiab lus ntawm SiO2. M thiab ρ ncaj qha cuam tshuam rau lub zog saum npoo, chav tsev kub lub zog, siab kub lub zog thiab lub zog seem ntawm lub plhaub. Hauv kev tsim khoom, M ntawm sodium silicate feem ntau tswj ntawm 3.0 ~ 3.4, thiab txheej txheej ρ yog tswj ntawm 1.25 ~ 1.28g / cm3. Cov txheej txheem reinforcing ρ yog tswj ntawm 1.30 ~ 1.34g / cm3. Thaum M thiab ρ tsis ua raws li qhov yuav tsum tau ua, kho M nrog cov kua qaub lossis alkali, thiab kho ρ nrog dej lossis iav dej siab. Viscosity kuj yog ib qho tseem ceeb ntawm kev ua tau zoo ntawm cov iav dej, nws ncaj qha cuam tshuam rau kev ua haujlwm ntawm cov coatings thiab cov plhaub, cov yam ntxwv cuam tshuam rau viscosity ntawm iav dej yog modulus, ntom, kub, thiab lwm yam, dej iav viscosity nce nrog qhov nce ntawm M, nce ceev, thiab txo qhov kub thiab txias.
Vim tias muaj SiO2 dawb hauv cov iav dej, tom qab qee lub sijhawm ntawm kev cia, SiO2 tso rau hauv qab ntawm lub thawv, ua rau txo qis hauv cov iav dej modulus. Yog li ntawd, nyob rau hauv tus txheej txheem ntawm kev siv, ntxiv rau qhov kev ntsuam xyuas ib zaug thaum lub khob dej yog unloaded, nws yuav tsum tau kuaj dua tom qab 24 teev ntawm kev cia kom paub tseeb tias lub khob dej raws li qhov yuav tsum tau.
1.2 Kev cuam tshuam thiab tswj cov hmoov ntawm lub plhaub zoo
Qhov luaj li cas ntawm cov hmoov nyob rau hauv txheej yuav tsum tsim nyog, thaum cov hmoov nyob rau hauv lub txheej yog ntxhib, lub txheej precipitates sai, thiab cov txheej txheem stability yog tsis zoo, ua rau ib tug ntxhib nto ntawm lub casting. Cov hmoov zoo heev muaj kev cuam tshuam ntau dua rau ntawm txheej txheej, thiab txheej txheej tsis yooj yim los tswj, ua rau txheej txheej ntawm cov qauv siv quav ciab yog tuab heev, cov ces kaum thiab grooves tau loj heev, thiab cov tawv tawv yog impermeable. Hauv kev tsim khoom tiag tiag, cov hmoov tsim nyog raug xaiv nrog qhov nruab nrab particle loj ntawm 35 ~ 50μm. Cov txheej txheem tsim nrog cov hmoov no tsis tsuas yog txhim kho cov hmoov-rau-kua piv, tab sis kuj txhim kho cov txheej txheem stability.
1.3 Cov nyhuv thiab kev tswj cov surfactant ntawm lub plhaub zoo
Lub luag haujlwm tseem ceeb ntawm surfactant yog txhawm rau txo qhov nro ntawm cov txheej txheej, ua kom cov nyhuv ntub dej ntawm cov txheej txheem pwm, thiab txhim kho cov txheej dai. Cov surfactant yuav tsum ua tau raws li cov kev mob ntawm cov dej soluble, txo qhov nro saum npoo, zoo wettability thiab permeability, tsawg npuas tiam thiab tsis tshua muaj npuas stability, thiab tsis muaj tshuaj lom neeg cov tshuaj tiv thaiv nrog txheej txheej.
Hauv kev tsim khoom tiag tiag, txhawm rau txhawm rau txhim kho lub peev xwm ntub dej ntawm cov xim rau cov quav ciab pwm, cov quav ciab pwm yog ntxuav nrog cov hmoov ntxhua ua ntej ua lub plhaub kom tshem tawm cov wax chips thiab oily tshuaj ntawm qhov chaw. Polyoxyethylene alkyl cawv ether yog ntxiv rau cov txheej txheej saum npoo kom txo qhov nro ntawm cov txheej txheej, txhim kho lub peev xwm txheej txheej thiab lub peev xwm ntub dej ntawm cov quav pwm, txo cov viscosity ntawm txheej, ua rau cov micelle sib npaug, thiab gel yog tusyees precipitated, uas pab txhim kho lub zog ntawm lub plhaub. Feem ntau, qhov sib ntxiv yog {{0}}.1% ~ 0.3%, thiab nws yog tsim nyog ntxiv raws li cov ntsiab lus sib txawv ntawm ntxhib thiab nplua hmoov.
2. Kev tswj lub plhaub ua ib puag ncig
Lub plhaub-ua ib puag ncig ntawm no feem ntau yog hais txog qhov ntsuas kub ntawm qhov chaw tsim khoom. Vim lub rhiab heev ntawm cov dej iav-quartz hmoov txheej rau qhov kub thiab txias, ntawm ib sab, nrog rau qhov kub thiab txias ntawm txheej txheej, nws qhov ntom thiab viscosity ntawm lub khob ntws qis, ntawm qhov tod tes, nrog kev nce ntawm qhov kub thiab txias, lub gelling ceev nrawm, thiab txheej txheej yog yooj yim rau crusting sai thiab tsis tuaj yeem sprinkled nrog xuab zeb, uas ua rau kom txo tau lub zog ntawm lub plhaub. Txog rau qhov kawg no, qhov kub ntawm cov txheej yuav tsum tau tswj kom ruaj khov ntawm cov hmoov-rau-kua piv, ua kom cov txheej txheem siv tau thiab cov permeability ntawm hardener. Vim li no, nyob rau hauv huab cua kub, lub modulus ntawm iav dej yog tswj nyob rau hauv qis qis, thiab huab cua humidity tswj ntawm 60% ~ 80%. Nyob rau hauv lub caij ntuj no, qhov kub ntawm lub rhiav ntau lawm yuav tsum tau khaws cia siab tshaj 16 degree, thiab nto txheej yuav tsum tau tswj ntawm 20 ~ 25 degree, uas tsis tsuas yog stabilize lub hmoov-kua piv, tab sis kuj kov yeej qhov teeb meem ntawm ceev ceev gelling.
3. Kev tswj cov txheej txheem ua lub plhaub ua haujlwm
3.1 Tswj txheej txheem kev npaj xim
Lub formulation ntawm cov xim yog txheej txheem ntawm kev tsim ib tug ib txwm muaj pes tsawg leeg ntawm cov xim los ntawm stirring thiab xa rov qab cov xim Cheebtsam. Nyob rau hauv kev npaj ntawm coatings, dej iav, refractory cov ntaub ntawv thiab cov neeg ua hauj lwm ntub dej yuav tsum tau coj raws li qhov kev faib ua feem, thiab ces cov hmoov thiab ntub dej yuav tsum tau ntxiv rau lub khob dej nyob rau hauv lub xeev ntawm stirring, thiab stirring yuav tsum tau txuas ntxiv mus ntxiv. tshaj 1 teev tom qab ntxiv. Cov xim pleev xim yuav tsum tau siv tag nrho. Lub hom phiaj ntawm kev kho recirculation yog kom ntub tag nrho cov binder thiab hmoov, thiab tso tawm cov gases adsorbed rau saum npoo ntawm cov hmoov thiab cov roj uas muaj feem xyuam thaum stirring. Tom qab qhov kev hloov pauv, qhov ceev ntawm cov txheej yuav nce ntxiv, viscosity yuav txo qis thiab zoo li ruaj khov, txheej thiab fluidity yuav zoo, gelling shrinkage yuav me me thaum lub sij hawm hardening, thiab lub zog ntawm lub plhaub yuav zoo dua. Feem ntau, nws yuav tsum tau ua kom cov txheej txheej saum npoo yuav tsum tau siv dua li 8 teev tom qab kev npaj, thiab rov ua dua li 20 feeb ua ntej siv, thiab cov nyhuv siv tau zoo dua tom qab sawv ntsug li 5 feeb. Tam sim no, feem ntau ntawm cov xim sib tov siv L-shaped xim tov khoom.
3.2 Tswj txheej txheem txheej thiab xuab zeb sprinkling
Cov txheej yuav tsum tau nplawm sib npaug ua ntej siv, lub viscosity ntawm lub khob ntws thiab qhov hnyav ntawm cov smear yuav tsum tau rov ntsuas dua, thiab kho rau qhov tsim nyog ntau yam. Tom qab ntawd lub module yog immersed nyob rau hauv cov xim, nce thiab nqis thiab tig, lifting thiab dripping tawm cov xim ntau dhau, thiaj li hais tias cov xim sib npaug ntawm qhov chaw ntawm lub module. Yuav tsum tsis txhob muaj cov xim pleev xim hauv zos lossis tsis muaj xim, rau qhov sib sib zog nqus qhov, grooves thiab concave ces kaum ntawm lub module, compressed cua yuav tsum tau siv los tsuag cov xim, thiab yog hais tias tsim nyog, ib tug txhuam yuav siv tau los tshem tawm cov pa npuas.
Rau cov xuab zeb saum npoo, yog tias cov nplej yog ntxhib dhau lawm, txheej txheej yuav ua rau cov pwm tuaj pwm, thiab nws thiaj li ua rau lub npoo ntawm casting tsis sib xws, tab sis cov xuab zeb particle loj dhau lawm yuav ua rau sab nraub qaum, uas tsis yog qhov tsim nyog rau kev sib xyaw ua ke ntawm cov khaubncaws sab nraud povtseg sab saud thiab sab qis, thiab yooj yim ua rau lub plhaub stratified. Yog li ntawd, hauv kev tsim khoom, cov txheej txheem txheej xuab zeb yog 40/70 mesh, txheej txheej hloov pauv yog 20/40 mesh xuab zeb, thiab cov xuab zeb rov qab yog 10/20 mesh. Txhua hom xuab zeb sprinkling yuav tsum tsis txhob muaj concentrated, thiab tib lub sijhawm, nws yog ib qho tsim nyog yuav tsum tau them sai sai rau tshem tawm cov xuab zeb ntab saum npoo av tom qab cov xuab zeb tshem tawm.
3.3 Kev cuam tshuam thiab kev tswj cov txheej txheem hardening
Xaiv cov hardener thiab tswj cov txheej txheem hardening. Raws li ib tug hardener, NH4Cl muaj teeb meem ntawm polluting ib puag ncig, corroding khoom, thiab tsis ruaj tsis khov lub zog ntawm lub plhaub. Lub plhaub tawv tawv ntawm crystalline AlCl3 muaj lub zog siab, loj gelling shrinkage, tsis zoo ntawm castings, thiab nyuaj xuab zeb tu. Txhawm rau kom kov yeej qhov tsis txaus ntawm ob lub hardeners, NH4Cl thiab crystalline AlCl3 sib xyaw hardening tau txais, uas yog, 1 ~ 3 txheej yog hardened nrog NH4Cl, thiab 4 ~ 6 txheej yog hardened nrog AlCl3.
Lub concentration ntawm NH4Cl raws li ib tug hardener yog feem ntau tswj ntawm 22% ~ 25% (feem ntau pawg), thiab nyob rau hauv ntau lawm, thiaj li yuav luv lub sij hawm hardening thiab txhim kho efficiency ntau lawm, peb siv ib tug saturated tov. Lub sij hawm hardening feem ntau tswj ntawm 3 ~ 10 feeb, ua raws li 15 ~ 45 feeb ntawm huab cua kom qhuav (nyob ntawm seb muaj pes tsawg txheej). Vim hais tias cov solubility ntawm NH4Cl nyob rau hauv dej nce nrog qhov kub thiab txias, qhov kub ntawm lub rhiav thiab kev daws yuav tsum tau tswj nyob rau hauv ntau lawm, tshwj xeeb tshaj yog rau cov rhiav ntau lawm nyob rau hauv peb cheeb tsam qaum teb, ntawm ib sab, qhov tsim nyog ntsuas cua sov yuav tsum tau. coj mus rau kev cob qhia ntau lawm, ntawm qhov tod tes, qhov tsim nyog ntsuas cua sov thiab ntsuas cua sov yuav tsum tau ua rau NH4Cl kev daws teeb meem ua ntej txhua qhov kev tsim khoom los txhim kho nws cov solubility, thiab cov qauv thiab kev sim yuav tsum tau ua, thiab cov khoom tuaj yeem nqa tawm tsuas yog tom qab. xeem dhau.

Los ntawm kev tswj hwm ntawm cov ntsiab lus saum toj no uas cuam tshuam rau qhov zoo ntawm lub plhaub, cov khoom zoo ntawm lub plhaub yog ruaj khov, thiab qhov tsis xws luag ntawm qhov precision casting raug txo qis, yog li ntawd qhov zoo ntawm peb cov castings tau raug txhim kho kom zoo dua qub. yam twg.
Nyob rau hauv luv luv, thiaj li stabilize qhov zoo ntawm cov dej iav plhaub nyob rau hauv ntau lawm, nws yuav tsum tau ua:
(1) Qhov zoo ntawm cov iav dej thiab hmoov yuav tsum tau tswj nruj me ntsis.
(2) Cov surfactant yuav tsum tau siv rationally los txhim kho lub peev xwm txheej.
(3) Qhov kub ntawm lub plhaub ua rhiav yuav tsum nruj me ntsis tswj.
(4) Kev npaj cov txheej txheem yuav tsum tau rov ua dua tshiab.
(5) Kev ua haujlwm ntawm dipping txheej thiab xuab zeb tawg yuav tsum tau ua raws li tus qauv.

Detection Systems

Copper Silica Sol Investment Casting