Advanced Manufacturing: Ceramic Txhaj Moulding ntawm qhov sawv

Daim ntawv thov ntawm ceramic txhaj molding tshuab

Nrog rau kev txhim kho sai ntawm CIM thev naus laus zis, cov khoom siv tshuaj pleev xim ceramic tau siv rau qee yam

1. Ib feem peb ntawm Swiss watch case yog tsim los ntawm ceramic hmoov txhaj tshuaj molding tshuab, thiab cov khoom yog zirconia, cov khoom siv ceramic uas tsis hnav.
2. Nyiv muaj industrialized zirconia fiber connectors nrog puab lub qhov taub ntawm 0.015mm.
3. Tebchaws Asmeskas tau paub txog kev tsim cov zirconia plaub hau clippers thiab siv cov khoom siv silicon nitride hauv cov tshuab.
4. Tsim cov txheej txheem ceramic ntawm precision ob chav helix tov khoom thiab ceramic nozzles nrog ob txoj xov nyob rau hauv Lub Xeev Lub Chaw Haujlwm Tseem Ceeb ntawm Hmoov Metallurgy ntawm Central South University of Technology ntawm Tuam Tshoj. Lub zirconia sensor tau ntse tsim los ntawm Lub Tsev Kawm Ntawv ntawm Cov Khoom Siv Science thiab Tshuab ntawm Huazhong University of Science thiab Technology siv CIM thev naus laus zis.

Cov txheej txheem yooj yim khiav daim ntawv ntawm ceramic txhaj tshuaj molding

Hmoov, binder, dispersant, lubricant - sib tov - degassing granulation - txhaj tshuaj - degreasing - sintering - khoom kuaj

Ceramic Txhaj tshuaj molding tshuab rau ceramic hmoov yuav tsum

1. Cov hmoov yuav tsum tau npaj tshwj xeeb rau kev txwv tsis pub ntim ntau thiab tus nqi qis;
2. Cov hmoov tsis agglomerate;
3. Cov duab ntawm cov hmoov yog feem ntau spherical;
4. Muaj kev sib txhuam txaus ntawm cov hmoov kom tsis txhob deformation los yog lub cev qhuav dej tom qab lub binder raug tshem tawm. Feem ntau, lub kaum sab xis ntawm txoj kab nqes yuav tsum siab dua 55 °;
5. Txhawm rau kom yooj yim sintering, nws yuav tsum muaj qhov nruab nrab me me me me, feem ntau tsawg dua 1 μm;
6. Cov hmoov nws tus kheej yog ntom, tsis muaj pores sab hauv;
7. Qhov saum npoo ntawm cov hmoov yog huv si thiab tsis hnov ​​​​mob chemically nrog cov binder.

Txhaj tshuaj molding binder system

Binders hauv kev txhaj tshuaj molding muaj ob txoj haujlwm yooj yim.

Ua ntej tshaj plaws, cov hmoov tuaj yeem sib xyaw ua ke hauv cov txheej txheem txhaj tshuaj molding, thiab cov hmoov tuaj yeem muaj qhov dej zoo tom qab cua sov;

Qhov thib ob, lub binder tuaj yeem tswj cov duab ntawm lub cev tom qab txhaj tshuaj molding thiab thaum lub sij hawm degreasing.

Nws tuaj yeem hais tias binder yog qhov tseem ceeb thiab qhov tseem ceeb hauv cov hmoov txhaj tshuaj molding tshuab, thiab txhua qhov kev txhim kho thiab kev ua tiav ntawm cov txheej txheem txhaj tshuaj molding yog nrog los ntawm kev yug los ntawm kev sib koom ua ke tshiab. Nyob rau hauv CIM, vim hais tias cov hmoov particle loj me dua cov hlau hmoov txhaj tshuaj molding, lub fluidity ntawm cov hmoov nws tus kheej yog tsis zoo, thiab qhov sib txawv ntawm cov hmoov thiab cov binder tom qab sib tov yog heev me me, ua rau nyuaj degreasing, uas tso rau pem hauv ntej ntau xav tau kev pab rau lub binder. Yog li ntawd, raws li ib tug ceramic txhaj molding binder, cov nram qab no tej yam kev mob yuav tsum tau ua raws li:

1. Kev txav tau zoo. Lub viscosity ntawm kev txhaj tshuaj molding yuav tsum yog nruab nrab, viscosity siab dhau lawm, cov hmoov tsis tuaj yeem cuam tshuam zoo hauv cov ntaub ntawv, nws tsis yooj yim rau kev sib xyaw, tab sis kuj nyuaj kom tau txais ib qho kev sib xyaw ua ke, uas yooj yim los tsim cov pwm pwm; Tsis tshua muaj viscosity yuav ua rau delamination ntawm ceramic hmoov thiab binder, thiab viscosity tsis tuaj yeem hloov pauv ntau dhau nrog qhov kub thiab txias, txwv tsis pub muaj teeb meem yuav tshwm sim.

2. Lub binder yuav tsum muaj peev xwm ntub cov hmoov zoo thiab muaj qhov adhesion zoo ntawm cov hmoov. Feem ntau txhawm rau txhawm rau txhim kho kev ua haujlwm ntub dej ntawm cov ntawv khi, qee cov khoom siv saum npoo av yuav tsum tau ntxiv kom txo cov viscosity ntawm cov sib tov thiab ua kom nws cov fluidity. Nyob rau tib lub sijhawm, tus binder ntub cov khoom los tsim cov capillary quab yuam kom adsorb cov khoom thiab ua kom lub cev tsis txhob deformation. Txhawm rau kom muaj kev ruaj ntseg ntawm lub billet, cov hmoov yuav tsum yog inert txheeb ze rau lub binder.

3. Lub binder yog tsim los ntawm ntau yam organic teeb meem. Nws yog ib qho nyuaj rau ib tug tib organic binder kom tau raws li qhov yuav tsum tau fluidity, thiab tom qab ib tug ntawm cov Cheebtsam yog degreased tawm, ib tug qhib porosity yog tsim, uas yog conducive rau lub exclusion ntawm cov seem binder. Kev xyaum tau ua pov thawj tias qhov degreasing tus nqi ntawm ntau cov khoom sib khi yog nrawm dua li ntawm ib qho khoom sib txuas thiab qhov tsis xws luag yog tsawg dua. Tau kawg, cov organic polymers nrog ntau cov khoom sib txuas yog sib xws.

4. Lub binder muaj siab thermal conductivity thiab qis thermal expansion coefficient. Qhov no tsis tsuas yog zam qhov tsis xws luag los ntawm thermal stress, tab sis kuj txo cov thermal shock rau lub cev thiab txo qhov tsis xws luag.

5. Tsis tas li ntawd, cov binder tseem yuav tsum tsis muaj tshuaj lom, tsis muaj kuab lom, tsis muaj kuab lom, tsis muaj dej tsis haum, thiab kev ua haujlwm kub ntawm cyclic tsis hloov.

Kev sib piv ntawm qhov zoo thiab qhov tsis zoo ntawm ntau yam binder systems

Muaj ob peb hom binders hauv CIM yog tsim

Nyob rau hauv xyoo tas los no, feem ntau binders feem ntau siv nyob rau hauv ntau yam ceramic hmoov txhaj molding nyob rau hauv lub ntiaj teb no. Raws li tuaj yeem pom los ntawm lub rooj, cov binders siv hauv CIM feem ntau yog cov khoom siv thermoplastic multi-component system.

Kev npaj ntawm CIM sib tov

Ib qho sib tov yog sib xyaw ntawm cov hmoov thiab binder. Nyob rau hauv tag nrho cov txheej txheem txhaj tshuaj molding, kev npaj cov hmoov thiab polymer binder sib tov yog ib qho ntawm cov kauj ruam tseem ceeb tshaj plaws. Cov txheej txheem yuav tsum tau sib tov kom muaj homogeneity zoo, zoo rheological zog thiab zoo degreasing yam ntxwv.

Rau qhov kev xaiv sib xyaw tshuab, lub luag haujlwm tseem ceeb yog kom phim tus nqi, kub thiab sijhawm. Txawm li cas los xij, yog tias qhov sib tov ceev thiab qhov kub thiab txias tsawg dhau, txawm tias lub sijhawm sib tov ntev npaum li cas tuaj yeem tsis sib xws.

Qhov teeb meem rheological ntawm PIM feem ntau yog qhov kev ntsuam xyuas thiab kev ua yam ntxwv ntawm cov viscosity ntawm qhov sib tov.

Txhaj tshuaj molding

Lub hom phiaj ntawm kev txhaj tshuaj molding yog kom tau txais CIM tsim lub cev uas tsis muaj qhov tsis xws luag thiab cov khoom sib xws hauv cov duab uas xav tau. Cov kev npaj sib tov feem ntau tuaj yeem raug txhaj rau hauv lub tshuab yas txhaj tshuaj molding tshuab, lossis tuaj yeem txhaj rau hauv lub tshuab txhaj tshuaj tshwj xeeb. Cov txheej txheem molding feem ntau suav nrog kev txhaj tshuaj kub, txhaj tshuaj siab, txhaj tshuaj ceev, siab tuav, siab tuav lub sijhawm txias thiab pwm kub. Yog tias cov txheej txheem tsis raug tswj tau zoo, nws yooj yim los tsim ntau yam tsis xws luag. Kev txhaj tshuaj tsis tuaj yeem raug tshem tawm hauv cov txheej txheem tom ntej, yog li cov txheej txheem no yuav tsum tau tswj hwm nruj, uas yog qhov tseem ceeb rau kev txhim kho cov khoom lag luam tawm los thiab kev siv cov khoom siv.

Zirconia txhaj tshuaj molding qhov chaw

Kev tswj ntawm qhov tsis xws luag hauv cov txheej txheem txhaj tshuaj ceramic

Kev tswj xyuas qhov tsis xws luag hauv cov txheej txheem txhaj tshuaj molding tuaj yeem txiav txim siab los ntawm ob yam: ntawm ib sab, kev sib raug zoo ntawm molding kub, siab thiab lub sijhawm teem; Lwm qhov nam yog qhov ntws ntawm pub hauv pwm kab noj hniav thaum txhaws. Vim tias feem ntau cov khoom CIM yog qhov me me nrog cov duab sib txawv thiab cov kev xav tau siab, cov dej ntws ntawm cov khoom sib xyaw hauv cov pwm kab noj hniav cuam tshuam cov pwm tsim teeb meem, nrog rau qhov chaw ntawm qhov chaw noj mov, qhov ntev ntawm cov dej ntws, qhov chaw ntawm lub qhov dej, thiab lwm yam.

Ceramic sintering

Cov txheej txheem sintering feem ntau yog los tswj cov qoob loo loj hlob ntawm cov ceramics, tau txais cov ntaub ntawv theem uas yuav tsum tau ua, thiab xyuas kom lub siab sintering ceev thiab ntom ceramic sintered lub cev.

Sintering txheej txheem ob qho tseem ceeb tsis: sintering kub thiab sintering lub sij hawm

Tshiab ceramic txhaj tshuaj molding txheej txheem

Powder co-injection molding (PCM) yog ib qho tshiab ntawm kev txhaj tshuaj molding.Cov txheej txheem no siv lub tshuab txhaj tshuaj molding ob lub taub hau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm Cov txheej txheem no tso cai rau kev kho saum npoo kom ua tiav thaum txhaj tshuaj molding, tsis yog tom qab cov khoom tiav tau npaj. Kev npaj thiab kev kho saum npoo ntawm cov khoom tuaj yeem ua tiav hauv ib qho txheej txheem, uas yog nws tus kheej txaus nyiam los ntawm kev pom thiab kev lag luam.

Tsis tshua muaj siab txhaj tshuaj molding tshuab, nyob rau hauv cov nqe lus ntawm kev txhaj tshuaj nws tus kheej, tsis tshua muaj siab txhaj tshuaj txheej txheem yog zoo dua li kev txhaj tshuaj siab.Kev pub noj ntawm cov viscosity dav dav ntawm 1.5-4.0Pa.s tuaj yeem ua tiav los ntawm 0.8Mpa compressed cua, uas tuaj yeem tshem tawm cov hydraulic system, txhaj tshuaj piston thiab txuas pas nrig hauv cov khoom siv ib txwm muaj. Nws tuaj yeem pom tau tias qhov zoo ntawm kev txhaj tshuaj tsis tshua muaj siab yog qhov tsis tshua muaj siab gradient nyob rau hauv kev txhaj tshuaj ntsuab, me me pwm hnav, tsis yog-stick pwm pub, tsis txhob noj cov pa phem los ntawm kev hnav ntawm cov tshuaj piston thiab tsis sib cais ntawm cov hmoov / khi. Tsis tas li ntawd, muaj kev siv hluav taws xob tsawg, cov khoom siv me me, cov qauv yooj yim thiab tus nqi qis.