Kuponya mchenga kwa mavavu

Kuponyera mchenga: Kuponyera mchenga komwe kumagwiritsidwa ntchito kwambiri pamakampani opanga ma valve kungathenso kugawidwa m'mitundu yosiyanasiyana ya mchenga mongamchenga wonyowa, mchenga wouma, mchenga wa galasi lamadzi ndi mchenga wa furan wosaphikamalinga ndi zomangira zosiyanasiyana.

(1) Mchenga wobiriwira ndi njira yopangira njira yomwe bentonite imagwiritsidwa ntchito ngati binder pantchitoyo. Makhalidwe ake ndi awa: nkhungu yomalizidwa ya mchenga siyenera kuwumitsidwa kapena kuthandizidwa mwapadera, nkhungu yamchenga imakhala ndi mphamvu zina zonyowa, ndipo pachimake cha mchenga ndi chipolopolo zimakhala ndi zovomerezeka bwino, zomwe ndizosavuta kuyeretsa ndi kugwa mchenga. The akamaumba kupanga dzuwa ndi mkulu, mkombero kupanga ndi lalifupi, ndipo zinthu mtengo ndi otsika, amene ndi yabwino yokonza kupanga mzere msonkhano. Zoyipa zake ndi izi: ma castings amatha kukhala ndi zilema monga pores, mchenga wothira, mchenga womata, komanso mtundu wa castings, makamaka wamkati, ndiwotalikirapo.

(2) Mchenga wouma ndi njira yachitsanzo pogwiritsa ntchito dongo ngati chomangira, ndipo bentonite yaying'ono imatha kukulitsa mphamvu yake yonyowa. Makhalidwe ake ndi awa: nkhungu yamchenga iyenera kuumitsidwa, imakhala ndi mpweya wabwino komanso kufalikira kwa mpweya, sikophweka kutulutsa zolakwika monga kuchapa mchenga, kumamatira mchenga, ndi pores, komanso khalidwe lamkati la kuponyera limakhalanso labwino. Zoyipa zake ndi izi: zida zowumitsa mchenga zimafunikira, ndipo nthawi yopanga ndi yayitali.

(3) Mchenga wa sodium silicate ndi njira yowumba pogwiritsa ntchito galasi lamadzi ngati chomangira. Makhalidwe ake ndi awa: galasi lamadzi limagwira ntchito yokhoza kuumitsa pokhapokha mutakumana ndi CO2, ndipo likhoza kukhala ndi ubwino ndi ubwino wosiyanasiyana wa gasi kuumitsa chitsanzo ndi kupanga pakati. Komabe, pali zovuta zina monga kukomoka bwino kwa zipolopolo, kuvutikira kuyeretsa mchenga poyikapo, komanso kutsika kwa mchenga wogwiritsidwa ntchito.

(4) Furan utomoni osaphika mchenga akamaumba ndi njira kuponyera ndi furan utomoni monga binder. Pa kutentha kwa chipinda, mchenga wowuma umachiritsidwa chifukwa cha mankhwala a binder pansi pa zochita za wothandizira. Makhalidwe ake ndi awa: nkhungu ya mchenga siyenera kuuma, yomwe imafupikitsa kwambiri kupanga ndikusunga mphamvu. Mchenga woumba utomoni ndi wosavuta kuphatikizika ndipo umakhala ndi kugwa kwabwino, ndipo mchenga wowumba wa ma castings ukhoza kutsukidwanso mosavuta, kulondola kwapang'onopang'ono kwa ma castings ndikwambiri, ndipo kumalizidwa kwapamtunda ndikwabwino, komwe kumatha kusintha kwambiri mtundu wa castings. Zoyipa zake ndi: zofunikira zamtundu wa mchenga waiwisi ndizokweranso, malo opangirako amakhala ndi fungo loyipa pang'ono, ndipo mtengo wa utomoni ndiwokwera. Kusakaniza kwa mchenga woumitsa utomoni wa furan: Mchenga wodziumitsa utomoni umapangidwa ndi chosakanizira chamchenga mosalekeza, kuwonjezera mchenga waiwisi, utomoni, mankhwala ochiritsira, ndi zina zotero, ndikusakaniza mwachangu. Sakanizani ndikugwiritsa ntchito nthawi iliyonse. Dongosolo lowonjezera zopangira zosiyanasiyana posakaniza mchenga wa utomoni ndi motere: mchenga woyambirira + wochiritsa (p-toluenesulfonic acid aqueous solution) – (120-180S) – resin + silane – (60-90S) – mchenga (5) Chitsanzo Mchenga wamtundu wa Casting popanga njira: kuponya mwatsatanetsatane.