1.Wiech txheej txheem

Cov txheej txheem Wiech yog sawv cev los ntawm patent tsim los ntawm Wiech hauv xyoo 1980 thiab tau txhim kho ntau zaus. Cov txheej txheem nplaum yooj yim ntawm Wiech txheej txheem yog tsim los ntawm paraffin wax thiab thermoplastic resin. Cov binder thiab hmoov sib tov rau ntawm "Z" lossis "Σ" hom hniav shear ntaus ntawv. Thawj txheej txheem degreasing yog ob-kauj ruam txheej txheem uas MIM tsim billet yog thawj zaug muab tso rau hauv lub tshuab nqus tsev ntim thiab rhuab mus rau los yog siab tshaj qhov kub ntawm cov binder, thiab tom qab ntawd cov kuab tshuaj maj mam ntxiv rau hauv daim ntawv gaseous rau lub thawv uas tsim cov billet nyob. Cov kuab tshuaj gaseous nkag mus rau hauv daim ntawv billet kom yaj lub binder, thiab thaum yaj mus rau ib qho twg, cov kuab tshuaj ntawm cov ntaub ntawv yuav exude los ntawm cov ntawv sau. Kev sib sau ua ke nrog feem ntau ntawm cov binder tshem tawm yog immersed nyob rau hauv ib tug kua hnyav kom tshem tawm cov seem binder. Thaum kawg, daim ntawv billet yog preheated kom tshem tawm ib co ntawm cov residual binder thiab hnyav, thiab cov khoom tiav yog sintered. Cov txheej txheem yuav siv sij hawm 3 hnub los degrease lub gaseous hnyav ib leeg

Lub efficiency ntawm degreasing yog tsawg heev. Raws li qhov kub degreasing siab tshaj qhov kub ntawm cov binder, lub deformation yog loj heev. Cov txheej txheem tom qab tau hloov mus rau tag nrho cov degreasing los ntawm thermal decomposition thiab lub sij hawm degreasing tau txo ntau. Hauv kev txhim kho thawj zaug ntawm MIM kev lag luam, feem ntau cov tuam txhab tau txais cov txheej txheem Wiech. Txog tam sim no, qee lub tuam txhab tseem siv cov txheej txheem Wiech rau kev tsim khoom. Txawm li cas los xij, cov txheej txheem Wiech muaj teeb meem xws li kev ntxhov siab ntawm kev txhaj tshuaj ntsuab dawb, yooj yim rau tawg thiab deformation, thiab nws yog ib qho nyuaj rau tsim cov khoom nrog loj loj.

2 txheej txheem Injectamax

Johnson ntawm AMAX Hlau Txhaj Molding Tebchaws USA tau tsim cov txheej txheem Injectamax hauv xyoo 1988. Lub ntsiab kom zoo dua ntawm cov txheej txheem yog tias nws cov binder muaj paraffin, zaub roj, thiab polymer. Cov roj zaub yog cov kua thaum txhaj thiab txias, uas ua rau lub ntim ntawm kev sib sau billet hloov me ntsis ua ntej thiab tom qab txhaj tshuaj molding, thiab alleviates cov kev ntxhov siab nyob rau hauv lub forming billet. Thaum degreasing, cov kuab tshuaj xws li trichloroethane yog siv los xaiv yaj cov roj zaub thiab cov tshuaj paraffin ua ntej, thaum cov khoom tsis zoo tsis yaj. Qhov no qhib lub pore channel thiab tom qab ntawd tshem tawm cov ntawv txuas ntxiv los ntawm thermal degreasing. Tag nrho cov txheej txheem degreasing lub sijhawm luv luv, tsuas yog 6h, yog ib qho

Txoj kev sai ntawm degreasing. Vim nws txoj kev yooj yim, kev nqis peev tsawg thiab kev ua haujlwm siab, qhov hnyav degreasing thiab thermal degreasing txheej txheem ob-kauj ruam tam sim no tau txais los ntawm feem ntau.MIM cov tuam txhabthiab manufacturers.

3 Metamold txoj kev

Metamold txheej txheem yog MIM catalytic degreasing txheej txheem tsim los ntawm Bloemacher sib npaug ntawm BSAF hauv lub teb chaws Yelemees thaum ntxov 1990s. Cov yam ntxwv tseem ceeb ntawm txoj kev no yog tias nws siv polyether resin li khi thiab catalyzes degreasing sai nyob rau hauv acidic cua. Kev siv cov saw ntev polyether resin ua cov ntawv khi, siv polyether resin polarity los txuas cov hmoov hlau, tuaj yeem tsim nyog rau ntau hom hmoov. Formaldehyde yog decomposed rau hauv formaldehyde nyob rau hauv catalysis ntawm acid cua. Cov tshuaj tiv thaiv decomposition no tshwm sim sai tshaj 110 ℃, uas yog ib qho kev hloov pauv ntawm cov khoom siv roj-2. BASF pib siv nitric acid ua ib qho catalyst, uas catalyzes degreasing ntawm qib qis dua polymerization.

Lub softening kub ntawm aldehyde resin zam lub tsim ntawm cov kua theem, uas yog zoo los tswj lub deformation ntawm ntsuab billet thiab xyuas kom meej qhov tseeb qhov ntev tom qab sintering. Lub catalytic degreasing yog nqa tawm ntawm lub interface ntawm lub binder nyob rau hauv cov huab cua 2. Tsis muaj roj nyob rau hauv lub forming billet, thiab cov advancing ceev ntawm cov tshuaj tiv thaiv interface yuav ncav cuag 1 ~ 4mm / h. BASF tom qab tsim ib txoj kev tshiab ntawm kev siv oxalic acid ua ib qho catalyst, uas tuaj yeem siv rau cov alloys nyuaj thiab ceramics, nthuav dav cov txheej txheem Metamold. Ib qho tseem ceeb ntawm Metamold txoj kev yog tias nws txais catalyst degreasing, thiab tsis muaj cov theem ua kua tshwm sim thaum lub sij hawm degreasing, uas tsis txhob muaj qhov tsis muaj zog uas MIM cov khoom muaj feem cuam tshuam rau deformation thiab kev tswj qhov tseeb yog qhov nyuaj. Nws yog ib qho kev tawg loj hauv MIM kev lag luam, thiab vim tias nws yog catalytic degreasing, lub sij hawm degreasing tau luv heev thiab tus nqi txo. Loj lojMIM qhov chawtuaj yeem tsim los ntawm Metamold txoj kev. Nrog CREMER qhov kev ua kom tsis tu ncua thiab sintering system, kev tsim khoom tas mus li yog ua tau, ua rau MIM muaj kev sib tw PM ze-huv sib sau tshuab. Txawm li cas los xij, txoj kev no muaj qee qhov teeb meem xws li cov khoom siv acid cua corrosion thiab cov khoom siv khib nyiab pov tseg, thiab tus nqi ntawm cov cuab yeej siv thawj zaug yog qhov siab.

Hens ntawm peb lub tuam txhab Thermal Precision Technology tau tsim cov txheej txheem tshiab hu ua precision hlauhmoov txhaj molding(PPIM). Lub tuam txhab thov tias kev siv cov txheej txheem no yuav txhawb nqa MIM thev naus laus zis mus rau lub sijhawm tshiab ntawm tus nqi qis, siab precision, siab tawm los thiab kev hloov pauv ib puag ncig. Cov yam ntxwv tseem ceeb ntawm PPIM txheej txheem yog embodied nyob rau hauv ob yam, ib tug yog siv cov dej-soluble binder. Lub binder muaj polyethylene glycol (PEG) ua thawj lub caij thiab ib qho crosslinked polymer xws li polyvinyl butyral (PVB) ua cov khoom thib ob. Yog li degreasing tuaj yeem muab faib ua ob kauj ruam, thawj zaug yog tshem tawm los ntawm dej dissolution methodPEG, qhov twg PVB tseem nyob rau hauv ib qho kev sib txuas ntawm cov khoom sib txuas. Ntawm qhov tod tes, cov txheej txheem PPIM tau txais cov hmoov hlau uas tsim los ntawm kev xa tawm ntawm qhov loj me me, siv cov hmoov ntxhib, hmoov zoo sib xyaw ua ke, kom cov khoom ntim ntawm cov hmoov hauv cov khoom noj yog nce, rau cov hmoov hlau stainless tuaj yeem ncav cuag 74% (ntim feem), zoo heev txo qhov me me shrinkage. Vim yog ob qho kev txhim kho no, qhov tseeb qhov tseeb ntawm cov khoom tuaj yeem ncav cuag ± 011% los ntawm kev sivPPIM txheej txheem, uas yog qhov siab tshaj ntawm tag nrho cov Cov txheej txheem MIMtam sim no.