Njengenqubo yokusakaza enembile, iimikhiqizo ekhiqizwa nguukutshala imaliabe nokunemba okuphezulu kobukhulu kanye namanani aphansi wokuhwalala komhlaba. Ukulingisa kwe-investimenti kuwukusakazwa kwe-net shape eseduze. Ikakhulukazi lapho i-silica sol isetshenziswa njengempahla eluhlaza yokwenza isikhunta segobolondo, ukunemba okungaphezulu kokubunjwa kokutshalwa kwezimali kungaqinisekiswa kangcono. Ngakho-ke, inqubo yokutshala imali ye-silica sol yamukelwa ngabaningiizisekelo zensimbi.
I-silica sol iyisibopho esivamile esisekelwe emanzini esine-silicic acid colloid structure. Kuyisixazululo se-polymer colloidal lapho izinhlayiya ze-silica ezihlakazeke kakhulu zincibilika emanzini. Izinhlayiya ze-colloidal ziyindilinga futhi zinobubanzi obungu-6-100nm. Iinqubo yokutshala imaliukwenza igobolondo inqubo gelling. Kunezici eziningi ezithonya i-gelation, ikakhulukazi i-electrolyte, i-pH, ukugxila kwe-sol kanye nezinga lokushisa. Kunezinhlobo eziningi zama-silica sols ezithengiswayo, futhi esetshenziswa kakhulu i-alkaline silica sol enokuqukethwe kwe-silica okungama-30%. Ukuze unqobe ukushiyeka komjikelezo omude wokwenza amagobolondo wegobolondo le-silica sol, i-silica sol eyomisa ngokushesha iye yathuthukiswa eminyakeni yamuva. Inqubo yokwenza igobolondo le-silica sol ilula. Inqubo ngayinye inezinqubo ezintathu: ukumboza, ukuhlanganisa, nokomisa. Inqubo ngayinye iphindaphindiwe izikhathi eziningi ukuze uthole igobolondo le-multilayer lobukhulu obudingekayo.
Izinga lokubekezelela kohlangothi lokukhonjiswa kokutshalwa kwezimali lingafinyelela ku-CT4 ~ CT7. Phakathi kwabo, amamaki okubekezelela okulinganayocast steel utshalomali castings, ukulingwa kwe-cast iron investment, ukufakwa kwe-investimenti kwe-nickel-based alloy nokusakazwa kwe-cobalt-based alloy investment ngokuvamile kuyi-CT5 ~ CT7. Izinga lokubekezelela kobukhulu bensimbi ekhanyayo kanyei-copper alloy investment castingsingafinyelela ku-CT4 ~ CT6.
| UKUBEKEZELEKA KOKUKHISHWA KOKUTSHALWA KWEMALI | |||
| Amayintshi | Amamilimitha | ||
| Ubukhulu | Ukubekezelelana | Ubukhulu | Ukubekezelelana |
| Kufika ku-0.500 | ±.004" | Kufika ku-12.0 | ± 0.10mm |
| 0.500 kuya ku-1.000" | ±.006" | 12.0 ukuze 25.0 | ± 0.15mm |
| 1.000 kuya ku-1.500" | ±.008" | 25.0 ukuze 37.0 | ± 0.20mm |
| 1.500 kuya ku-2.000" | ±.010" | 37.0 kuye ku-50.0 | ± 0.25mm |
| 2.000 kuya ku-2.500" | ±.012" | 50.0 ukuze 62.0 | ± 0.30mm |
| 2.500 kuya ku-3.500" | ±.014" | 62.0 ukuze 87.0 | ± 0.35mm |
| 3.500 kuya ku-5.000" | ±.017" | 87.0 ukuze 125.0 | ± 0.40mm |
| 5.000 kuya ku-7.500" | ±.020" | 125.0 kuya ku-190.0 | ± 0.50mm |
| 7.500 kuya ku-10.000" | ±.022" | 190.0 ukuze 250.0 | ± 0.57mm |
| 10.000 kuya ku-12.500" | ±.025" | 250.0 ukuze 312.0 | ± 0.60mm |
| 12.500 ukuze 15.000 | ±.028" | 312.0 ukuze 375.0 | ± 0.70mm |
Isikhathi sokuthumela: Feb-03-2021