Iyo yekuzviomesa-kuomesa jecha kukanda kana kusabikira jecha kukanda ndeyeimwe mhando yeresin yakavharwa jecha kukanda kana.shell mold castings process. Inoshandisa kemikari binder zvinhu kusanganisa nejecha uye kuvabvumira kuti vaome pachavo. Nekuti hapana pre-heat process inodiwa, maitiro aya anonziwo no-bake sand molding casting process.
Iro zita rekuti kwete-bike rakabva kuoiri-okisijeni yekuzviomesa-yakagadzirwa neSwitzerland mukutanga kwa1950, kureva kuti, mafuta akaoma senge linseed mafuta uye tung mafuta anowedzerwa nesimbi desiccants (senge cobalt naphthenate uye aluminium naphthenate) uye oxidant. (zvakadai se potassium permanganate kana sodium perborate, nezvimwewo). Uchishandisa maitiro aya, jecha repakati rinogona kuomeswa kune simba rinodiwa kuti mold isunungurwe mushure mekuchengetwa kwemaawa akati wandei patembiricha yekamuri. Yainzi kuomesa tembiricha yekamuri (Air Set), kuzviomesa (Self Set), kuomesa kutonhora (Cold Set) zvichingodaro. Asi haisati yasvika pakuzviomesa chaiko, ndiko kuti, hapana kubika (Kwete Bake), nekuti iyo yakapedzwa mold (core) inoda kuomeswa kwemaawa akati wandei isati yadururwa kuti iwane kuoma kwakakwana.
"jecha rinozviomesa" ishoko rakaonekwa mushure mekunge indasitiri yekuvakisa yatora makemikari anosunga, uye zvarinoreva ndezvi:
1. Mujecha rekusanganiswa kwejecha, kunze kwekuwedzera bhainda, chigadziro chekugadzirisa (kuoma) chinogona kuomesa binder chinowedzerwawo.
2. Mushure mekugadzira uye kugadzirwa kwepakati nejecha remhando iyi, hapana kurapwa (sekuomesa kana kuputika gasi rinoomesa) rinoshandiswa kuomesa mold kana core, uye mold kana core inogona kuoma pachayo.
Kubva mukupera kwema1950 kusvika kumavambo ekuma1960, nzira chaiyo yekuzviomesa isina hovhoni yakagadziridzwa zvishoma nezvishoma, inova iyo acid-yakarapwa (catalyzed) furan resin kana phenolic resin yekuzviomesa, uye nzira yekuzviomesa yega mafuta urethane yakagadzirwa 1965. Iyo phenolurethane self-hardening nzira yakatangwa muna 1970, uye phenolic ester. nzira yekuzviomesa yakaonekwa muna 1984. Naizvozvo, pfungwa ye "self-setting jecha" inoshandiswa kune ese majecha ekuumbwa akaomeswa nekemikari, kusanganisira jecha remafuta, jecha regirazi remvura, jecha resimende, aluminium phosphate bonded jecha uye jecha resin.
Sejecha rinozviomesa bhokisi rinosungira jecha, furan resin jecha ndiro rekutanga uye parizvino rinoshandiswa zvakanyanya sejecha rekugadzira binder muChinese foundry. Huwandu hweresin inowedzerwa mujecha rekuumbwa kazhinji 0.7% kusvika 1.0%, uye huwandu hweresin yakawedzerwa mujecha repakati kazhinji 0.9% kusvika 1.1%. Zvirimo zvemahara aldehyde mu furan resin zviri pazasi 0.3%, uye mamwe mafekitori adzika kusvika pazasi 0.1%. Munzvimbo dzakavambwa muChina, iyo furan resin inoomesa jecha yasvika padanho repasirese zvisinei nemaitiro ekugadzira uye nepamusoro pemhando yekukanda.
Mushure mekusanganisa jecha rekutanga (kana jecha rakadzoserwa), resin yemvura uye inokonzeresa yemvura zvakaenzana, uye kuizadza mubhokisi repakati (kana jecha bhokisi), wobva waisimbisa kuti iome kuita mold kana mold mubhokisi repakati (kana jecha bhokisi. ) pakupisa kwekamuri, iyo yekukanda mold kana kukanda core yakaumbwa, iyo inonzi self-hardening inotonhora-core box modeling (core), kana self-hardening method (core). Iyo yekuzviomesa nzira inogona kukamurwa kuita acid-catalyzed furan resin uye phenolic resin jecha self-hardening nzira, urethane resin jecha self-hardening nzira uye phenolic monoester self-hardening nzira.
Iwo ekutanga maitiro e-self-harding molding casting process ndeaya:
1) Kuvandudza kurongeka kwedimensional yecastingsuye kushata kwepamusoro.
2) Kuomeswa kwejecha (core) jecha hakudi kuomeswa, izvo zvinogona kuchengetedza simba, uye matanda asingadhuri kana epurasitiki mabhokisi epakati uye matemplate anogona kushandiswa zvakare.
3) Self-hardnening molding jecha iri nyore kubatanidza uye kudonha, nyore kuchenesa castings, uye jecha rekare rinogona kushandiswazve uye kushandiswa zvakare, izvo zvinoderedza zvakanyanya kusimba kwekushanda kwepakati kugadzira, kuenzanisa, kudonha kwejecha, kuchenesa uye zvimwe zvinongedzo, uye zviri nyore kuona mechanization kana otomatiki.
4) Iyo yakawanda chikamu cheresin mujecha ingori 0.8% ~ 2.0%, uye mutengo wakakwana wezvigadzirwa zvakaderera.
Nekuti iyo yekuzviomesa yekukanda maitiro ine akawanda ataurwa pamusoro akasarudzika mabhenefiti, iyo yekuzviomesa yejecha mold cast haingoshandiswe chete kugadzira core, asi zvakare inoshandiswa pakukanda kuumba. Iyo inonyanya kukodzera chidimbu chimwe chete uye diki kugadzirwa kwebatch, uye inogona kugadzira simbi yakakandwa, simbi yakakandwa uyenon-ferrous alloy castings. Mamwe maChinese akawanikwa akatsiva zvachose zviumbwa zvevhu rakaoma rejecha, zviumbwa zvejecha resimende, uye zvishoma zvakatsiva zviumbwa zvejecha remvura.
Nguva yekutumira: Jan-21-2021