Investment Casting Tolerance

Monga njira yolondola yoponyera, azopangidwa ndikuponya ndalamakukhala ndi kulondola kwapamwamba kwambiri komanso kutsika kwakanthawi kochepa. Investment casting ndi njira yapafupi yopangira maukonde. Makamaka pamene silica sol ikugwiritsidwa ntchito ngati zopangira popanga nkhungu za zipolopolo, kulondola kwapamwamba kwa zopangira ndalama kumatha kutsimikiziridwa bwino. Chifukwa chake, njira yopangira ndalama za silika sol imatengedwa mochulukiramaziko azitsulo.

Silica sol ndizomwe zimapangidwira m'madzi zomwe zimakhala ndi silicic acid colloid. Ndi polima colloidal njira imene kwambiri omwazikana silika particles sungunuka m'madzi. Ma colloidal particles ndi ozungulira ndipo ali ndi mainchesi a 6-100nm. Thendondomeko yoyendetsera ndalamakupanga chipolopolo ndi ndondomeko ya gelling. Pali zinthu zambiri zomwe zimakhudza gelation, makamaka electrolyte, pH, sol concentration ndi kutentha. Pali mitundu yambiri yazitsulo zamalonda za silika, ndipo zomwe zimagwiritsidwa ntchito kwambiri ndi zamchere zamchere zamchere zomwe zili ndi silica 30%. Pofuna kuthana ndi zofooka za chipolopolo chautali wa chipolopolo cha silica sol, silika yowuma mofulumira yapangidwa m'zaka zaposachedwa. Njira yopangira chipolopolo cha silica sol ndiyosavuta. Njira iliyonse ili ndi njira zitatu: zokutira, kupukuta mchenga, ndi kuyanika. Njira iliyonse imabwerezedwa kangapo kuti mupeze chipolopolo cha multilayer cha makulidwe ofunikira.

Mulingo wololera wazinthu zopangira ndalama zitha kufikira CT4 ~ CT7. Pakati pawo, dimensional kulolerana makalasi akuponyedwa zitsulo zopangira ndalama, zitsulo zopangira ndalama zopangira chitsulo, zopangira ndalama zopangira faifi tambala ndi ma aloyi opangidwa ndi cobalt nthawi zambiri amakhala CT5 ~ CT7. The dimensional kulolerana mlingo wa kuwala zitsulo ndiCopper alloy Investment castingsimatha kufika ku CT4 ~ CT6.