Kuponya nkhungu ya zipolopolondi njira yomwe mchenga wosakanikirana ndi utomoni wa thermosetting umaloledwa kuti ugwirizane ndi mbale yotentha yachitsulo yachitsulo, kotero kuti chipolopolo chopyapyala ndi cholimba cha nkhungu chimapangidwa mozungulira pattem. Kenako chipolopolocho chimachotsedwa pachitsanzocho ndipo cope ndi kukoka zimachotsedwa palimodzi ndikusungidwa mu botolo ndi zinthu zofunika kumbuyo ndipo chitsulo chosungunuka chimatsanuliridwa mu nkhungu.
Nthawi zambiri, mchenga wouma komanso wabwino (90 mpaka 140 GFN) wopanda dongo umagwiritsidwa ntchito pokonzekera mchenga woumba chipolopolo. Kukula kwa njere komwe kumayenera kusankhidwa kumadalira kumapeto komwe kumafunidwa pakuponyedwa. Kukula bwino kwa njere kumafuna utomoni wambiri, zomwe zimapangitsa nkhungu kukhala yokwera mtengo.
Ma resins opangira omwe amagwiritsidwa ntchito popanga zipolopolo ndi ma resins a thermosetting, omwe amaumitsidwa mosasinthika chifukwa cha kutentha. Ma resins omwe amagwiritsidwa ntchito kwambiri ndi phenol formaldehyde resins. Kuphatikiza ndi mchenga, ali ndi mphamvu zambiri komanso kukana kutentha. Ma phenolic resins omwe amagwiritsidwa ntchito popanga zipolopolo nthawi zambiri amakhala amitundu iwiri, ndiye kuti, utomoni umakhala ndi phenol wochulukirapo ndipo umakhala ngati thermoplastic material. Pa zokutira ndi mchenga utomoni pamodzi ndi chothandizira monga hexa methylene tetramine (hexa) mu gawo pafupifupi 14 mpaka 16% kuti kukulitsa makhalidwe thermosetting. Kutentha kwa machiritso kwa izi kudzakhala pafupi 150 C ndipo nthawi yofunikira ingakhale masekondi 50 mpaka 60.
Ubwino wa Shell Mold Casting Process
1.Zipolopolo za nkhunguNthawi zambiri amakhala olondola kwambiri kuposa kuponya mchenga. N'zotheka kupeza kulolerana kwa +0,25 mm kwa castings zitsulo ndi +0. 35 mm kwa imvi cast iron castings ndiductile iron castingspamikhalidwe yabwinobwino yogwirira ntchito. Pankhani ya nkhungu zololera bwino za chipolopolo, munthu atha kuzipeza mumtundu wa +0.03 mpaka +0.13 mm pazogwiritsa ntchito zina.
2. Malo osalala amatha kupezeka muzojambula za zipolopolo. Izi zimatheka makamaka ndi njere zocheperako zomwe zimagwiritsidwa ntchito. Mtundu wamtundu wa roughness ndi wa dongosolo la 3 mpaka 6 microns.
3. Ma angles okonzekera, omwe ndi otsika kuposa mchenga castings, zofunika mu nkhungu zipolopolo. Kuchepetsa kwa ma angles okonzekera kungakhale kuchokera ku 50 mpaka 75%, zomwe zimapulumutsa kwambiri ndalama zakuthupi ndi ndalama zotsatila.
4. Nthawi zina, ma cores apadera amatha kuchotsedwa popanga zipolopolo. Popeza mchenga uli ndi mphamvu zambiri nkhungu imatha kupangidwa m'njira yoti zibowo zamkati zitha kupangidwa molunjika ndi kufunikira kwa zipolopolo.
5. Komanso, zigawo zoonda kwambiri (mpaka 0.25 mm) zamtundu wa mitu ya silinda yoziziritsidwa ndi mpweya zimatha kupangidwa mosavuta ndi chipolopolo cha chipolopolo chifukwa cha mphamvu yapamwamba ya mchenga yomwe imagwiritsidwa ntchito popanga.
6. Permeability wa chipolopolo ndi mkulu choncho palibe gasi inclusions zimachitika.
7. Mchenga wochepa kwambiri uyenera kugwiritsidwa ntchito.
8. Makina amatheka mosavuta chifukwa cha njira yosavuta yopangira zipolopolo.
Zochepa za Shell Mold Casting Process
1. Ma pattens ndi okwera mtengo kwambiri ndipo chifukwa chake ndi okwera mtengo pokhapokha atagwiritsidwa ntchito pakupanga kwakukulu. Mwachizoloŵezi, kuumba kwa zipolopolo kumakhala kopanda ndalama pakuwumba mchenga ngati zomwe zimafunikira zili pamwamba pa zidutswa 15000 chifukwa cha mtengo wokwera kwambiri.
2. Kukula kwa kuponyera komwe kumapezeka popanga zipolopolo kumakhala kochepa. Nthawi zambiri, ma castings olemera mpaka 200 kg amatha kupangidwa, ngakhale pang'ono pang'ono, amapangidwa mpaka kulemera kwa 450 kg.
3. Mawonekedwe ovuta kwambiri sangapezeke.
4. Zida zamakono kwambiri zimafunika kuti zigwirizane ndi zipolopolo za zipolopolo monga zomwe zimafunikira pazitsulo zowonongeka.
Nthawi yotumiza: Dec-25-2020