Precision Casting, cov txheej txheem tseem ceeb hauv kev tsim khoom rau kev tsim cov siab tshiab {{Precision, cov cuab yeej kho mob, chaw kho tsheb, thiab lwm thaj teb. Siv cov xov xwm nruab nrab xws li siv cov tshuaj ciab thiab tej hub thiab cov hlau sib xyaw ua ke, xav tau cov khoom siab heev, qhov chaw ua tiav, thiab zoo nyob hauv. Txawm li cas los xij, tus txheej txheem no cuam tshuam nrog kev sib koom tes ntawm ntau cov kauj ruam, thiab ib qho kev nthuav dav dhau los ua rau cov khoom lag luam tsis xws lossis txawm seem. Yog li ntawd, nruj kev tswj hwm ntawm cov ntsiab lus tseem ceeb thiab cov haujlwm tshwj xeeb ntawm txhua tus txheej txheem yog cov ua ntej tseem ceeb ua kom muaj qhov zoo ntawm kev ua haujlwm.
1. Cov ncauj lus kom ntxaws tswj ntawm pwm tsim thiab cov ntaub
Cov pwm yog "tus qauv ua qauv" rau Precision Casting, thiab nws qhov tseeb cuam tshuam rau cov yam ntxwv geometric ntawm qhov kawg casting. Thaum lub sij hawm tsim theem, kev tshwj xeeb yuav tsum tau them nyiaj rau kev suav hem kom nyuaj. Lub thermal nthuav coefficients ntawm cov hlau sib txawv (xws li stainless hlau, titanium alloy, thiab aluminium alloy) sib txawv. Muaj cov nyiaj pab tsawg shrinkage (feem ntau yog 1.5% -3% yuav tsum tau tshwj tseg raws cov khoom siv, thiab them nyiaj hauv zos yuav tsum tau hloov kho raws li kev nyuaj ntawm cov qauv txheej txheem. Tsis tas li ntawd, cov txheej txheem kev ua haujlwm (suav nrog qhov loj me thiab qhov chaw sib tw, thiab ingening cov roj ntws ntws tawm uas yuav ua rau muaj cua nkag, lossis txias kaw cov khoom puas. Lub tshuab ua cua tsim yuav tsum ua kom pom tseeb tias kev nqus roj hauv cov qauv pwm (tshwj xeeb tshaj yog cov qauv vax) tuaj yeem raug rho tawm kom tiv thaiv kom tsis txhob muaj lub hws hws.
Thaum lub taub ntim quav ciab qauv ntau lawm txheej txheem, qhov kub thiab txias, thiab kev txhaj tshuaj ceev ntawm cov ciab yuav tsum tau nruj me ntsis tswj. Kev kub dhau heev tuaj yeem ua rau oxidation yooj yim tuaj yeem ua rau oxidation thiab degeneration ntawm cov ciab, thaum ntau dhau qhov kev kub heev tuaj yeem ua rau tsis muaj qhov yooj yim los sau cov yam ntxwv zoo. Kev txhaj tshuaj siab yuav tsum muaj pwm kom tsis txhob muaj pwm kom tsis txhob muaj kev cuam tshuam lossis kev puas tsuaj rau cov chaw muaj zog vim tias muaj ntau dhau. Tsis tas li ntawd, thaum lub tshuab ua yeeb yam siv WAX qauv (chav dej dej kub los ntawm kev ua kom tsis txhob muaj lub zog
Parameter ruaj khov thaum lub pwm npaj npaj
Lub plhaub pob zeb (cov plhaub pluaj ceramic) yog cov cab kuj tseem ceeb rau txais thiab txhuam cov hlau molten. Nws cov kev txiav txim siab zoo ntawm kev txiav txim siab ncaj qha rau saum npoo av thiab qhov sib npaug ntawm qhov tseeb ntawm lub casting. Lub Pwm Ntau Txheej Txheem feem ntau siv tau ntau- txheej txheej txheej txheej (txheej txheej saum toj). Cov txheej saum toj kawg nkaus, uas los rau hauv kev sib chwv ntawm Molten, yuav tsum tau siab-) thiab ib phau ntawv (xws li Silica Sol). Cov txheej txheej txheej tuab (kwv yees li 0.3-0.5mm) thiab muaj kev kub ntxhov rau 0.5m kev sib zog ua kom muaj kev sib tw dhau los lossis tsis txaus ntseeg los ntawm kev ua kom qhuav ntau dhau. Lub nraub qaum txheej, feem ntau tsim ntawm coarser mullite sand / hmoov, tsom rau kev txhim kho lub zog tag nrho kom tiv thaiv cov hlau molten. Txawm li cas los xij, lub tshuab tswj cov ntsiab lus ntawm cov txheej tom qab cov khoom siv yuav tsum tau ua tib zoo saib xyuas (piv txwv li tsawg dua lossis sib npaug nrog 0.5%) kom tiv thaiv cov tshuaj lom neeg thiab paug ntawm cov casting.
Mold shell firing is a critical step in removing residual wax, organic matter, and moisture. The firing temperature profile must be customized based on the mold shell material. For silica sol mold shells, the temperature is typically raised to 800-900°C and held for 2-3 hours to ensure complete decomposition of organic matter and densification of the mold shell. A rapid heating rate (>50 Qib / H) yuav ua rau cov pwm tawg. Lub sijhawm tsis txaus yuav ua rau muaj kev cia siab rau cov roj carbon impurities, uas tuaj yeem ua rau lub carburization lossis porosity nyob rau hauv lub cam khwb cia. Tom qab tua hluav taws, lub plhaub pwm yuav tsum txias rau chav sov nyob rau hauv lub cub tawg ua ntej siv kom tsis txhob muaj kev ntxhov siab thiab kev puas tsuaj los ntawm kev txias sai.
III. Cov txheej txheem precision hauv melting thiab pouring
Lub purity ntawm molten hlau thiab kub tswj tau yog qhov tseem ceeb heev rau kev ua tiav. Before melting, raw materials (such as ingots and recycled materials) must undergo spectral analysis to strictly control the content of impurities (such as sulfur, phosphorus, and oxygen). Yog tias tsim nyog, lub puab tsaig lub tshuab nqus tsev lossis cov sib cav- shielded fais rauv yuav tsum tau siv los txo cov oxidation thiab cov pa nqus. Nruam stirring (electromagetic lossis tshuab) yog qhov yuav tsum tau thaum lub sij hawm yaj ua kom ntseeg tau tias muaj kev sib xyaw ua ke. Degassing cov neeg sawv cev (xws li Hexachathane) lossis lub tshuab nqus tsev yog siv los txo cov ntsiab lus hydrogen ([h] tsawg dua los yog sib npaug los yog sib npaug los yog sib npaug).
Ncuav qhov kub thiab nrawm yuav tsum tau kho cov qauv siv hluav taws xob ua kom tsis txhob muaj qhov kub me (piv txwv li cov neeg siv hluav taws xob ua ntej ntawm cov hlau ua kom tsis txhob muaj zog Tuab thiab cov khoom loj yuav tsum tau qis dua kub (piv txwv li, 1500-1550℃rau titanium alloys) thiab ib qho tswj hwm tus nqi los tiv thaiv kev kub ntau dhau los ntawm kev nce qoob loo loj. Nqus nkoj casting lossis siab castasting tuaj yeem txhim kho kev txhim kho pwm tshuab hluav taws xob (siab tswj tau cov siab (siab rau ± 0.05MPA).
IV. Posticive Post - Ua thiab Kev Soj Ntsuam Zoo
Tom qab txias, castings yuav tsum txiav kev kho kom huv, thiab kho cua sov (xws li kev daws teeb meem kub thiab kev laus) kom tshem tawm sab hauv kev ntxhov siab thiab txhim kho cov khoom siv hauv sab hauv. Cov txheej txheem kev txiav yuav tsum zam kev ua kom muaj kev puas tsuaj (tshwj xeeb tshaj yog cov npoo muag). Hlau txiav los txiav laser txiav. Kev kho tshav kub kub (xws li cua sov kub thiab tuav lub sijhawm) yuav tsum nruj me ntsis phim cov txheej txheem txheej txheej alloy. Piv txwv li, nickel {{4 4}} based superalloys feem ntau yog kev kho mob kho thaum 1100} 1180 txias, thiab tom qab ntawd muaj hnub nyoog ntawm 700-800 degree.
Kev soj ntsuam zoo yog kab kawg ntawm kev tiv thaiv thiab xav tau kev sib xyaw ua ke) kom paub txog qhov tseeb ntawm qhov tseeb (thev naus laus zis feem ntau yog tswj tau hauv ± 0.05 hli); X - duab tshav lossis ultrasonic kuaj kom paub qhov tsis xws sab hauv (xws li pores thiab shrinkage); metallographic microscopy los txheeb xyuas cov microstructure (xws li cov nplej loj thiab theem faib khoom); Thiab saum npoo roughness ntsuas ntsuas qhov tseem ceeb (ra tsawg dua lossis sib npaug rau 0.8μm rau qhov chaw ntsuas). Yog tsis ua raws li cov tseev kom muaj cov tseev kom muaj cov txheej txheem rov qab thiab kev hloov kho, nrog cov duab kos duab thiab rov qab yog qhov tsim nyog.
Tag
High - Cov zis zoo nyob rau hauv precision casting rawm ntawm kev tswj hwm meticulous thoob plaws tag nrho cov txheej txheem. Los ntawm millimeter -}}}}} Kev tsim cov khoom lag luam kom ua kom pom tseeb qhov ntsuas kub, txhua kauj ruam yuav tsum tau ua cov kev txawj ntse. Tsuas yog los ntawm txhais lus kev qhia tawm ua haujlwm rau hauv kev ua haujlwm zoo nkauj ua ntej lawv muaj peev xwm pom tau tias muaj peev xwm ua tau zoo rau cov khoom lag luam
