Poponya mchenga, oposa 95% amagwiritsa ntchito mchenga wa silika. Ubwino waukulu wa mchenga wa silika ndikuti ndi wotsika mtengo komanso wosavuta kuupeza. Komabe, kuipa kwa mchenga wa silika kumawonekeranso, monga kusakhazikika kwamafuta, kusintha kwa gawo loyamba kumachitika pafupifupi 570 ° C, kuchuluka kwa kutentha kwapamwamba, kosavuta kusweka, ndipo fumbi lomwe limapangidwa chifukwa chopuma limavulaza kwambiri thanzi la munthu. . Panthawi imodzimodziyo, ndi chitukuko chofulumira cha chuma, mchenga wa silika umagwiritsidwa ntchito kwambiri m'makampani omanga, mafakitale a galasi, zoumba ndi mafakitale ena. Pali kusowa kwa mchenga wa silika wapamwamba komanso wokhazikika. Kupeza zolowa m'malo mwake ndi vuto lachangu padziko lonse lapansi.
Lero tiyeni tikambirane za kusiyana ena wamba yaiwisi mchenga mu bizinesi foundry, malinga sndfoundry gulu zaka zambiri zokumana nazo, komanso kulandira abwenzi ambiri kuti agwirizane nkhani.
1.Common Raw Sands ku Foundry
1.1 Mchenga wachilengedwe
Mchenga wachilengedwe, womwe umachokera ku chilengedwe, monga mchenga wa silica, mchenga wa chromite, mchenga wa zircon, mchenga wa azitona wa magnesium etc.
1.2 Mchenga Wopanga
Monga Wopanga silika mchenga, zotayidwa silicate mndandanda yokumba ozungulira mchenga, etc.
Apa ife makamaka timayambitsa zotayidwa silicate mndandanda yokumba ozungulira mchenga.
2. Aluminiyamu silicate mndandanda yokumba ozungulira mchenga
Aluminiyamu silicate mndandanda yokumba mchenga ozungulira, womwe umadziwikanso kuti "ceramic foundry sand", "Cerabeads", "ceramic mikanda", "ceramsite", "Synthetic spherical sand for casting (Moon sand)", "mullite mikanda", "high refractoriness spherical mchenga", "Ceramcast", "Super sand", etc., palibe mayina ofanana padziko lapansi ndipo miyezo imasiyanasiyananso. (Timatcha mchenga wa ceramic m'nkhaniyi)
Koma pali mfundo zitatu zofanana kuti awazindikire motere:
A. Kugwiritsa ntchito aluminium silicate refractory materials (bauxite, kaolin, miyala yamtengo wapatali, ndi zina zotero) monga zipangizo,
B. Tinthu tating'onoting'ono ta mchenga timakhala tozungulira tikasungunuka kapena kusungunuka;
C. The makamaka mankhwala zikuchokera Al2O3, Si2O, Fe2O3, TiO2 ndi okusayidi ena.
Chifukwa pali ambiri manufactures ku China wa mchenga ceramic, pali mitundu yosiyanasiyana ndi pamwamba pa njira zosiyanasiyana ndi malo osiyana choyambirira cha zopangira, ndi osiyana Al2O3 okhutira ndi kutentha zokolola.
3. The magawo mchenga kwa foundry
| Sndi s | NRD/℃ | T.E．(20-1000℃)/% | B.D./(g/cm3) | E. | TC (W/mk) | pH |
| FCS | ≥1800 | 0.13 | 1.8-2.1 | ≤1.1 | 0.5-0.6 | 7.6 |
| SCS | ≥1780 | 0.15 | 1.4-1.7 | ≤1.1 | 0.56 | 6-8 |
| Zircon | ≥1825 | 0.18 | 2.99 | ≤1.3 | 0.8-0.9 | 7.2 |
| Chromite | ≥1900 | 0.3-0.4 | 2.88 | ≥1.3 | 0.65 | 7.8 |
| Olive | 1840 | 0.3-0.5 | 1.68 | ≥1.3 | 0.48 | 9.3 |
| Silika | 1730 | 1.5 | 1.58 | ≥1.5 | 0.49 | 8.2 |
Zindikirani: Mchenga wa fakitale ndi malo osiyanasiyana, deta idzakhala ndi kusiyana kwina.
Pano pali deta wamba basi.
3.1 Makhalidwe osangalatsa
Malinga ndi chilling capacity formula, kuzizira kwa mchenga kumakhudzana makamaka ndi zinthu zitatu: matenthedwe matenthedwe, kutentha kwapadera, ndi kachulukidwe weniweni. Tsoka ilo, zinthu zitatuzi ndizosiyana ndi mchenga kuchokera kwa opanga osiyanasiyana kapena koyambira, kotero pakukula Pakugwiritsa ntchito zitsulo zosamva kuvala, tapeza kuti mchenga wa chromite umakhala ndi zotsatira zabwino kwambiri zoziziritsa kukhosi, kuthamanga kwachangu kuzirala, komanso kusamva bwino. kuuma, kutsatiridwa ndi mchenga wa ceramic wosakanikirana, mchenga wa silika, ndi mchenga wa sintered ceramic. , kuuma kosagwirizana ndi kuvala kwa kuponyera kudzakhala kochepa ndi mfundo 2-4.
3.2 Kutha kufananiza
Monga chithunzi pamwambapa, mitundu itatu ya mchenga imasunga maola 4 ndi 1590 ℃ mu ng'anjo.
Kuwonongeka kwa mchenga wa sintered ceramic ndiye wabwino kwambiri. Katunduyu adagwiritsidwanso ntchito bwino muzopanga za Aluminium.
3.3 Kufananiza mphamvu ya mchenga nkhungu kwa maziko
ATiye magawo a utomoni yokutidwa mchenga nkhungu kwa maziko
| Mchenga | HTS(MPa) | RTS(MPa) | AP (Pa) | Mtengo wa LE (%) |
| CS70 | 2.1 | 7.3 | 140 | 0.08 |
| CS60 | 1.8 | 6.2 | 140 | 0.10 |
| CS50 | 1.9 | 6.4 | 140 | 0.09 |
| CS40 | 1.8 | 5.9 | 140 | 0.12 |
| RSS | 2.0 | 4.8 | 120 | 1.09 |
Zindikirani:
1. Mtundu wa utomoni ndi kuchuluka kwake ndizofanana, mchenga woyambirira ndi kukula kwa AFS65, ndi zokutira zomwezo.
2. CS: Mchenga wa ceramic
RSS: Mchenga wa silika wokazinga
HTS: Mphamvu yotentha yotentha.
RTS: Kulimba kwachipinda
AP: Kuthekera kwa mpweya
Mtengo wa LE: Kukula kwa liner.
3.4 Kuchulukanso kwabwino kwa mchenga wa ceramic
Matenthedwe ndi makina reclamation njira zonse zabwino zoyenera ceramic mchenga, chifukwa cha tinthu ake 'kulimba mkulu, kuuma mkulu, mkulu kuvala kukana, ceramic mchenga pafupifupi ndi apamwamba kubadwanso nthawi yaiwisi mchenga mu ntchito mchenga foundry. Malinga ndi makasitomala athu apakhomo, mchenga wa ceramic ukhoza kubwezeredwa nthawi zosachepera 50. Nazi zina zomwe zimagawana:
Posachedwapa zaka khumi, chifukwa cha ceramic mchenga mkulu refractoriness, mpira mawonekedwe amene angathandize kuchepetsa utomoni Kuwonjezera padziko 30-50%, yunifolomu chigawo chimodzi zikuchokera ndi khola njere kugawa kukula, permeability mpweya wabwino, kukula pang'ono matenthedwe ndi makhalidwe apamwamba zongowonjezwdwa zobwezerezedwanso etc. monga aa ndale zinthu, izo zimagwira ntchito kwambiri ku castings angapo kuphatikizapo chitsulo choponyedwa, zitsulo zotayidwa, zitsulo zotayidwa, zotayidwa mkuwa, ndi zitsulo zosapanga dzimbiri. Njira zopangira ntchito zimakhala ndi mchenga wokutidwa ndi utomoni, mchenga wa Cold box, mchenga wosindikizira wa 3D, mchenga wosaphika utomoni, ndondomeko ya Investment, njira yotayira thovu, njira yamagalasi amadzi etc.
Nthawi yotumiza: Jun-15-2023
