Advanced Manufacturing: Ceramic Injection Molding irikukwira

Kushandiswa kweceramic jekiseni rekuumba tekinoroji

Nekukurumidza kusimudzira kweCIM tekinoroji, zvigadzirwa zvemajekiseni eceramic zvakaiswa mune zvimwe zvinhu

1. Chikamu chimwe muzvitatu cheSwiss watch kesi chinogadzirwa pachishandiswa ceramic poda jekiseni rekugadzira tekinoroji, uye zvinhu zvacho ndeye zirconia, chinhu checeramic chisingapfeki.
2. Japan ine maindasitiri ezirconia faibha zvibatanidza zvine dhayamita yemukati megomba re 0.015mm.
3. United States yakaona kugadzirwa kwe zirconia hair clippers uye kushandiswa kwesilicon nitride components mumainjini.
4. Yakagadzirwa ceramic lining ye precision double helix mixer uye ceramic nozzles ine shinda mbiri mu State Key Laboratory yePowder Metallurgy yeCentral South University of Technology yekuChina. Iyo zirconia sensor yakabudirira kugadzirwa neSchool of Materials Science uye Technology yeHuazhong University yeScience uye Technology uchishandisa CIM tekinoroji.

Basic process flow chart yeceramic jekiseni molding

Hupfu, binder, dispersant, lubricant - kusanganisa -- degassing granulation -- jekiseni -- degreasing -- sintering -- Chigadzirwa bvunzo

Ceramic Injection yekuumba tekinoroji yeceramic poda zvinodiwa

1. Powder inofanirwa kugadzirirwa zvakanyanya kune yakakwira muganho wekuzadza density uye yakaderera mutengo;
2. Iyo hupfu haina agglomerate;
3. Chimiro chehupfu chinonyanya kuita denderedzwa;
4. Pane kukakavara kwakakwana pakati pehupfu kudzivirira deformation kana kudonha kwebillet mushure mekunge binder yabviswa. Muzviitiko zvakawanda, kutsetseka kwechisikigo kweAngle kunofanira kunge kwakakura kupfuura 55 °;
5. Kuti ifambise kukurumidza sintering, inofanirwa kunge iine diki avhareji saizi, kazhinji isingasviki 1 μm;
6. Iyo poda pachayo yakaoma, isina pores mukati;
7. Kumusoro kwehupfu kwakachena uye hakuiti makemikari nebinder.

Injection molding binder system

Mabhainda mukuumba jekiseni ane mabasa maviri akakosha.

Chokutanga pane zvose, hupfu hunogona kusanganiswa zvakaenzana mujekiseni rekugadzira, uye hupfu hunogona kuva nemafuta akanaka mushure mekupisa;

Chechipiri, iyo binder inogona kuchengetedza chimiro chemuviri mushure mekugadzira jekiseni uye panguva yekudzikisa.

Zvinogona kutaurwa kuti binder ndiyo musimboti uye kiyi muupfu jekiseni rekuumba tekinoroji, uye kuvandudzwa kwega kwega uye kubudirira kwejekiseni molding process inoperekedzwa nekuzvarwa kweiyo itsva bonding system. MuCIM, nekuti saizi yehupfu idiki pane yesimbi yehupfu jekiseni rekuumba, iyo fluidity yehupfu pachayo haina kunaka, uye mukaha uripo pakati pehupfu nebhainda mushure mekusanganiswa idiki kwazvo, zvichikonzera kuoma kwakaoma, izvo zvinoisa mberi zvakanyanya kudiwa zvinodiwa kune binder. Naizvozvo, seceramic jekiseni rekuumba binder, zvinotevera zvinofanirwa kuzadzikiswa:

1. Kufamba kwakanaka. Iyo viscosity yekuumbwa kwejekiseni inofanira kuva yakadzikama, iyo viscosity yakanyanya kukwirira, hupfu haigoni kunyatsoparadzirwa mubhainda, haisi kuoma chete kusanganisa, asiwo zvakaoma kuwana yunifomu yakasanganiswa billet, iyo iri nyore kubudisa kukanganisa kuumba; Kunyanya kuderera viscosity kunokonzera delamination yeceramic poda uye binder, uye viscosity haigoni kuchinja zvakanyanya nekushisa, zvikasadaro kukanganisa kuchaitika.

2. Iyo binder inofanira kukwanisa kunyorovesa hupfu zvakanaka uye kuva nehutano hwakanaka hwekunamatira pahupfu. Kazhinji kuitira kuti uvandudze kunyorova kwebhainda, zvimwe zvinhu zvinoshanda zvinofanirwa kuwedzerwa kuderedza viscosity yemusanganiswa uye kuwedzera fluidity. Panguva imwecheteyo, binder inonyorovesa zvimedu kuti zvibudise simba re capillary kushambadza zvimedu uye kuchengetedza muviri kubva pakushanduka. Kuti uve nechokwadi chekugadzikana kwebillet, hupfu hunofanira kuva inert maererano nebhainda.

3. Binder inoumbwa ne-multi-component organic matter. Zvakaoma kune imwechete organic binder kuti isangane nezvinodiwa fluidity, uye mushure mekunge chimwe chezvikamu zvadzikiswa, porosity yakazaruka inoumbwa, iyo inobatsira kusabatanidzwa kwebinder yasara. Kudzidzira kwakaratidza kuti kuderera kwechiyero che-multi-component binder chinokurumidza kudarika chechikamu chimwe chete chebhainda uye hurema hushoma. Ehe, organic polymers ane akawanda-component binders anowirirana.

4. Binder ine high thermal conductivity uye yakaderera thermal kuwedzera coefficient. Izvi hazvisi kungodzivirira kukanganisa kunokonzerwa nekushungurudzika kwekushisa, asiwo kunoderedza kupisa kwekushisa kumuviri uye kunoderedza kukanganisa.

5. Mukuwedzera, iyo binder inofanirawo kunge isiri-chepfu, isina-kusvibisa, isingasviki, isina kunyorova, uye cyclic heat performance haishanduki.

Kuenzanisa zvakanakira uye kuipa kweakasiyana binder masisitimu

Mabhaidha akati wandei muCIM anogadzirwa

Mumakore achangopfuura, akajairika mabhainda anowanzoshandiswa mune dzakasiyana-siyana zvedongo poda jekiseni kuumba munyika. Sezvinoonekwa kubva patafura, mabhanhire anoshandiswa muCIM anonyanya kunge ari eiyo thermoplastic multi-component system.

Kugadzirira kweCIM musanganiswa

Musanganiswa musanganiswa wehupfu uye binder. Mune iyo yese jekiseni yekuumba maitiro, kugadzirira kwehupfu uye polymer binder musanganiswa ndeimwe yematanho akakosha. Iyo nzira inoda kuti musanganiswa uve nehomogeneity yakanaka, yakanaka rheological properties uye yakanaka degreasing maitiro.

Kune yakasarudzwa yekusanganisa tekinoroji, basa guru nderekufananidza chiyero, tembiricha uye nguva. Zvisinei, kana kusanganiswa kwekukurumidza uye kutonhora kwakanyanya kuderera, zvisinei kuti nguva yekusanganiswa haigoni kuva yunifomu yakareba sei.

Dambudziko rerheological rePIM rinonyanya kuongororwa uye hunhu hweiyo viscosity yemusanganiswa.

Jekiseni kuumba

Chinangwa chekugadzira jekiseni ndechekuwana CIM inoumba muviri isina kukanganisa uye yunifomu particle kurongwa mune yaunoda chimiro. Musanganiswa wakagadzirirwa unogona kubaiwa mumushini wakajairwa jekiseni repurasitiki, kana kuti unogona kubaiwa mumuchina wakakosha wejekiseni rehupfu. Molding process paramita kazhinji inosanganisira tembiricha yejekiseni, kumanikidza jekiseni, kumhanya kwejekiseni, kumanikidza kubata, kudzvanywa inobata nguva yekutonhora uye tembiricha yekuumbwa. Kana maparameter ekugadzirisa asina kudzorwa zvakanaka, zviri nyore kugadzira kukanganisa kwakasiyana. Kukanganisa kwejekiseni hakugone kubviswa muchirongwa chinotevera, saka maitiro aya anofanira kunyatsodzorwa, izvo zvakakosha pakuvandudza goho rechigadzirwa uye kushandiswa kwezvinhu.

Zirconia jekiseni kuumba zvikamu

Kudzora kwekukanganisa mune ceramic jekiseni molding process

Kudzora kwekuremara mukuumbwa kwejekiseni kunogona kutariswa kubva pamativi maviri: kune rumwe rutivi, hukama pakati pekushisa kwekuumba, kumanikidza uye nguva yakatarwa; Chimwe chikamu ndechekuyerera kwechikafu mugomba rekuumbwa kana uchizadza. Nekuti zvizhinji zveCIM zvigadzirwa zvikamu zvidiki zvine maumbirwo akaomarara uye nepamusoro-soro zvinodiwa, kuyerera kwemusanganiswa mugomba remuvhu kunosanganisira nyaya dzekugadzira mold, kusanganisira nzvimbo yechiteshi chekudya, kureba kwechiteshi chekuyerera, nzvimbo yegomba remhepo, nezvimwewo, izvo zvinoda kunzwisiswa kwakajeka kwemaparamendi emusanganiswa wekuyerera pfuma, tembiricha mugomba rekuumbwa uye kugoverwa kwekunetseka kwasara.

Ceramic sintering

Iyo sintering process inonyanya kudzora kukura kwezviyo kukura kweceramics, kuwana inodiwa chikamu zvinhu, uye kuve nechokwadi chepamusoro sintering density uye dense ceramic sintered body.

Sintering maitiro maviri akakosha paramita: sintering tembiricha uye sintering nguva

New ceramic jekiseni kuumba maitiro

Powder co-injection molding (PCM) kuvandudzwa kutsva kwehupfu jekiseni molding.Iyi tekinoroji inoshandisa kaviri-barrel jekiseni rekuumba muchina kupinza zvinotevedzana maviri akasiyana ehupfu/binder musanganiswa mugomba reforoma. Iyi nzira inobvumira kurapwa kwepamusoro kuti kuitwe panguva yekuumbwa kwejekiseni, kwete mushure mekunge chigadzirwa chakapedzwa chagadzirwa. Kugadzirira uye kurapwa kwepamusoro kwechigadzirwa kunogona kupedzwa mune imwe nzira, iyo pachayo inoyevedza zvikuru kubva kune unyanzvi uye hupfumi hwemaonero.

Low pressure jekiseni rekugadzira tekinoroji, maererano nejekiseni pachayo, yakaderera kumanikidza jekiseni maitiro ari nani pane yakanyanya kudzvanywa jekiseni.Kudyiswa kwegeneral viscosity pakati pe1.5-4.0Pa.s kunogona kupedzwa ne0.8Mpa yakadzvanywa mweya, iyo inogona kubvisa iyo hydraulic system, jekiseni piston uye yekubatanidza tsvimbo mumidziyo yechinyakare. Zvinogona kuonekwa kuti zvakanakira jekiseni yakaderera-yakaderera kudzvinyirira gradient mujekiseni yakasvibirira, diki kupfeka mold, isina-tsvimbo mold kudyisa, kudzivirira kusvibiswa kwekudya kunokonzerwa nekupfeka kwejekiseni piston uye kusaparadzaniswa kwehupfu / binder. Uye zvakare, kune yakaderera simba rekushandisa, diki midziyo saizi, yakapusa chimiro uye yakaderera mutengo.