Njengenkqubo yokuphosa echanekileyo, iiimveliso eziveliswa nguutyalo malibabe nokuchaneka okuphezulu komgangatho kunye namaxabiso asezantsi oburhabaxa. Ukwenziwa kotyalo-mali kukubunjwa kwenethi ekufutshane. Ngokukodwa xa i-silica sol isetyenziswa njengemathiriyeli ekrwada yokwenza i-shell molds, ukuchaneka komphezulu wotyalo-mali kunokuqinisekiswa ngcono. Ke ngoko, inkqubo yotyalo-mali ye-silica sol yamkelwa ngakumbi nangakumbimetal foundries.
I-silica sol iyisibophelelo esiqhelekileyo samanzi kunye nesakhiwo se-colloid ye-silicic. Sisisombululo se-polymer colloidal apho amasuntswana e-silica ahlakazeke kakhulu anyibilika emanzini. Amasuntswana e-colloidal angqukuva kwaye anobubanzi obuyi-6-100nm. Iinkqubo yotyalo-maliukwenza iqokobhe yinkqubo yegelling. Zininzi izinto eziphembelela i-gelation, ikakhulu i-electrolyte, i-pH, i-sol concentration kunye nobushushu. Kukho iintlobo ezininzi ze-silica sol zorhwebo, kwaye eyona isetyenziswayo yi-alkaline silica sol kunye nomxholo we-silica we-30%. Ukuze unqobe ukusilela komjikelezo omde wokwenza iqokobhe le-silica sol shell, i-silica sol eyomileyo ekhawulezayo iye yaphuhliswa kwiminyaka yakutshanje. Inkqubo yokwenza i-silica sol shell ilula. Inkqubo nganye ineenkqubo ezintathu: ukugquma, ukugalela isanti, nokomisa. Inkqubo nganye iphinda iphindwe kaninzi ukufumana igobolondo le-multilayer yobunzima obufunekayo.
Inqanaba lonyamezelo lomyinge wotyalo-mali lunokufikelela kwi-CT4 ~ CT7. Phakathi kwazo, amabakala okunyamezelana alinganayocast intsimbi kutyalo mali, i-cast iron investment castings, i-nickel-based alloy investment castings kunye ne-cobalt-based alloy investment castings ngokubanzi yi-CT5 ~ CT7. Inqanaba lokunyamezela idimensional yentsimbi ekhanyayo kunyeutyalo-mali lwe-alloy yobheduinokufikelela kwi-CT4 ~ CT6.
| UKUNYAMEZELA UKULAHLWA KOTYALO-MALI | |||
| I-intshi | Iimilimitha | ||
| Ubungakanani | Ukunyamezelana | Ubungakanani | Ukunyamezelana |
| Ukuya kuthi ga kwi-0.500 | ±.004" | Ukuya kuthi ga kwi-12.0 | ± 0.10mm |
| 0.500 ukuya kwi-1.000" | ±.006" | 12.0 ukuba 25.0 | ± 0.15mm |
| 1.000 ukuya 1.500” | ±.008" | 25.0 ukuba 37.0 | ± 0.20mm |
| 1.500 ukuya ku-2.000” | ±.010" | 37.0 ukuba 50.0 | ± 0.25mm |
| 2.000 ukuya 2.500” | ±.012" | 50.0 ukuba 62.0 | ± 0.30mm |
| 2.500 ukuya 3.500” | ±.014" | 62.0 ukuba 87.0 | ± 0.35mm |
| 3.500 ukuya ku-5.000" | ±.017" | 87.0 ukuba 125.0 | ± 0.40mm |
| 5.000 ukuya 7.500” | ±.020" | 125.0 ukuya ku-190.0 | ± 0.50mm |
| 7.500 ukuya 10.000” | ±.022" | 190.0 ukuba 250.0 | ± 0.57mm |
| 10.000 ukuya kwi-12.500" | ±.025" | 250.0 ukuba 312.0 | ± 0.60mm |
| 12.500 ukuba 15.000 | ±.028" | 312.0 ukuba 375.0 | ± 0.70mm |
Ixesha lokuposa: Feb-03-2021