1.Wiech ndondomeko

Njira ya Wiech imayimiridwa ndi patent yopangidwa ndi Wiech mu 1980 ndipo yasinthidwa kangapo. Njira zomatira za Wiech zimapangidwa ndi sera ya parafini ndi utomoni wa thermoplastic. Zomangira ndi ufa zimasakanizidwa pa chipangizo cha "Z" kapena "Σ" chamtundu wa blade. Njira yoyamba yochepetsera mafuta ndi njira ziwiri zomwe MIM imapanga billet imayikidwa poyamba mu chidebe cha vacuum ndikutenthedwa kapena pamwamba pa kutentha kwa kutentha kwa binder, ndiyeno zosungunulirazo zimawonjezedwa pang'onopang'ono mu mawonekedwe a mpweya ku chidebe chomwe kupanga billet kuli. Chosungunulira mpweya chimalowa mu billet kupanga kuti asungunuke chomangiracho, ndipo chikasungunuka pamlingo wina, njira yosungunulira ya binder idzatuluka kuchokera pakupanga billet. Chopanda chopanda kanthu chomwe chomangiracho chimachotsedwa chimamizidwa mumadzi osungunulira kuti achotse chomangira chotsalira. Pomaliza, kupanga billet kumatenthedwa kuti achotse zotsalira zotsalira ndi zosungunulira, ndipo chomalizidwacho chimatenthedwa. Njirayi imatenga masiku atatu kuti muchepetse mafuta osungunulira mpweya okha

Kuchita bwino kwa degreasing ndikotsika kwambiri. Popeza kutentha kwa degreasing ndikwambiri kuposa kutentha kwa chomangira, kupindika kumakhala koopsa. Pambuyo pake ndondomekoyi inasinthidwa kuti ikhale yowonongeka ndi kuwonongeka kwa kutentha ndipo nthawi yowonongeka inachepetsedwa kwambiri. Pachitukuko choyambirira chamakampani a MIM, makampani ambiri adatengera njira ya Wiech. Mpaka pano, makampani ena amagwiritsabe ntchito njira ya Wiech popanga. Komabe, njira ya Wiech ili ndi zovuta monga kupsinjika kwakukulu kwa jakisoni wobiriwira wopanda kanthu, kosavuta kusweka komanso kupindika, ndipo ndizovuta kupanga magawo okhala ndi kukula kwakukulu.

2 Njira ya Injectamax

Johnson wa AMAX Metal Injection Molding USA adapanga njira ya Injectamax mu 1988. Ubwino waukulu wa njirayi ndikuti binder yake imakhala ndi parafini, mafuta a masamba, ndi polima. Mafuta a masamba ndi madzi pamene jekeseni ndi utakhazikika, zomwe zimapangitsa kuti voliyumu ya kupanga billet isinthe pang'ono isanayambe kapena itatha kupanga jekeseni, ndipo imachepetsa kupsinjika kwa mkati mwa kupanga billet. Pamene degreasing, zosungunulira monga trichloroethane ntchito kusankha kusungunula mafuta masamba ndi parafini sera poyamba, pamene insoluble zigawo zikuluzikulu si kusungunuka. Izi zimatsegula njira ya pore kenako ndikuchotsa chomangira chotsaliracho pochotsa mafuta. Nthawi yonse yochotsera mafuta ndi yochepa, 6h yokha, ndi imodzi

Njira yofulumira kwambiri yochepetsera mafuta. Chifukwa cha kuphweka kwake, ndalama zochepa komanso kugwiritsa ntchito bwino kwambiri, njira yosungunulira yosungunulira ndi kutenthetsa matenthedwe awiri imatengedwa ndi ambiri.Makampani a MIMndi opanga.

3 Njira ya Metamold

Metamold process ndi njira yochepetsera mafuta ya MIM yopangidwa ndi Bloemacher yofanana ndi BSAF ku Germany koyambirira kwa 1990s. Waukulu luso khalidwe la njira imeneyi ndi kuti amagwiritsa poliyesi utomoni monga binder ndi catalyzes degreasing mwamsanga mu acidic mpweya. Kugwiritsa ntchito utomoni wautali wa polyether monga binder, pogwiritsa ntchito polyether resin polarity kulumikiza ufa wachitsulo, ukhoza kukhala woyenera pamitundu yambiri ya ufa. Formaldehyde imasinthidwa kukhala formaldehyde pansi pa catalysis ya acid atmosphere. Kuwonongeka kumeneku kumachitika mwachangu pamwamba pa 110 ℃, komwe ndi kusintha kwachindunji kwa gasi-2. BASF poyamba inkagwiritsa ntchito nitric acid ngati chothandizira, chomwe chimapangitsa kuti mafuta azichepa kwambiri kuposa polymerization.

Kutentha kofewetsa kwa utomoni wa aldehyde kumapewa kupangika kwa gawo lamadzimadzi, komwe kumakhala kopindulitsa kuwongolera kusinthika kwa billet yobiriwira ndikuwonetsetsa kulondola kwake pambuyo pa sintering. The catalytic degreasing ikuchitika pa mawonekedwe a binder mu mlengalenga 2. Palibe mpweya mu kupanga billet, ndi patsogolo liwiro la anachita mawonekedwe akhoza kufika 1 ~ 4mm / h. Pambuyo pake BASF inapanga njira yatsopano yogwiritsira ntchito oxalic acid monga chothandizira, chomwe chingagwiritsidwe ntchito pazitsulo zolimba ndi zoumba, kukulitsa ntchito ya Metamold. Mbali yofunika ya Metamold njira ndi utenga chothandizira degreasing, ndipo palibe gawo madzi limapezeka pa degreasing, amene amapewa kufooka kuti MIM mankhwala sachedwa mapindikidwe ndi dimensional molondola kulamulira n'kovuta. Ndiwopambana kwambiri pamakampani a MIM, ndipo chifukwa ndikuthandizira kuchepetsa, nthawi yotsitsa imafupikitsidwa kwambiri ndipo mtengo wake umachepetsedwa. Kukula kwakukuluZithunzi za MIMakhoza kupangidwa ndi njira ya Metamold. Ndi CREMER's mosalekeza degreasing ndi sintering system, kupanga mosalekeza ndi kotheka, kupanga MIM kukhala PM mpikisano kwenikweni pafupi-ukhondo kupanga teknoloji. Komabe, njira iyi ili ndi zovuta zina monga zida zowononga mpweya wa asidi ndi chithandizo cha gasi, ndipo mtengo wa zida zoyambira ndi wokwera kwambiri.

Nkhuku za kampani ya Us-Based Thermal Precision Technology yapanga njira yatsopano yotchedwa precision metalufa jekeseni akamaumba(PPIM). Kampaniyo imati kugwiritsa ntchito njirayi kupangitsa ukadaulo wa MIM kukhala nthawi yatsopano yotsika mtengo, yolondola kwambiri, yokolola zambiri komanso kusintha chilengedwe. Makhalidwe akuluakulu aukadaulo a PPIM ali ndi mbali ziwiri, imodzi ndikugwiritsa ntchito binder yosungunuka m'madzi. Chomangiracho chimakhala ndi polyethylene glycol (PEG) monga chinthu choyamba ndi polima chophatikizika monga polyvinyl butyral (PVB) ngati chinthu chachiwiri. Choncho degreasing akhoza kugawidwa mu masitepe awiri, woyamba amachotsedwa ndi madzi Kutha methodPEG, kumene PVB amakhalabe mu mtanda zolumikizidwa olimba boma. Komano, ndondomeko PPIM utenga zitsulo ufa wopangidwa ndi kutumizidwa kwa lonse tinthu kukula, ntchito coarse ufa, chabwino ufa collocation, kuti Mumakonda ufa mu chakudya chawonjezeka, chifukwa zosapanga dzimbiri ufa akhoza kufika 74% (voliyumu kagawo), kuchepetsa kwambiri shrinkage kukula. Chifukwa cha kuwongolera kuwiri uku, kulondola kwazinthuzo kumatha kufika ± 011% pogwiritsa ntchitoNjira ya PPIM, amene ali wapamwamba kwambiri mwa onse Zotsatira za MIMpakadali pano.