Raws li ib tug precision casting txheej txheem, lubcov khoom tsim los ntawmpeev castingmuaj qhov siab qhov tseeb thiab qhov tsawg ntawm qhov roughness qhov tseem ceeb. Kev nqis peev casting yog qhov ze ze ntawm cov duab casting. Tshwj xeeb tshaj yog thaum silica sol yog siv los ua cov khoom siv raw rau kev ua lub plhaub pwm, qhov tseeb ntawm cov peev txheej castings tuaj yeem lav tau zoo dua. Yog li ntawd, silica sol peev casting txheej txheem yog saws los ntawm ntau thiab ntauhlau foundries.
Silica sol yog ib yam dej-raws li khi nrog ib tug silicic acid colloid qauv. Nws yog ib tug polymer colloidal tov nyob rau hauv uas heev dispersed silica hais yog soluble nyob rau hauv dej. Cov colloidal hais yog spherical thiab muaj ib txoj kab uas hla ntawm 6-100nm. Covtxheej txheem ntawm peev castingua lub plhaub yog txheej txheem ntawm gelling. Muaj ntau yam cuam tshuam rau gelation, feem ntau yog electrolyte, pH, sol concentration thiab kub. Muaj ntau hom kev lag luam silica sols, thiab feem ntau siv yog alkaline silica sol nrog cov ntsiab lus silica ntawm 30%. Txhawm rau kov yeej qhov tsis txaus ntawm lub plhaub ntev ua lub voj voog ntawm silica sol plhaub, ib qho kev ziab silica sol tau tsim nyob rau xyoo tas los no. Cov txheej txheem ntawm kev ua silica sol plhaub yog qhov yooj yim. Txhua txheej txheem muaj peb txheej txheem: txheej, xuab zeb, thiab ziab. Txhua tus txheej txheem yog rov ua ntau zaus kom tau txais lub plhaub multilayer ntawm qhov yuav tsum tau ua kom tuab.
Qhov siab kam rau ua theem ntawm peev castings tuaj yeem ncav cuag CT4 ~ CT7. Ntawm lawv, qhov dimensional tolerance qib ntawmcam khwb cia hlau peev castings, cam khwb cia hlau peev castings, npib tsib xee-raws li alloy peev castings thiab cobalt-based alloy peev castings feem ntau yog CT5 ~ CT7. Lub dimensional kam rau ua theem ntawm lub teeb hlau thiabtooj liab alloy peev castingstuaj yeem ncav cuag CT4 ~ CT6.
| INVESTMENT CASTING TOLERANCES | |||
| Ntiv | millimeters | ||
| Dimension | Ua siab ntev | Dimension | Ua siab ntev |
| Mus txog 0.500 | ± .004 " | Mus txog 12.0 | ± 0.10 hli |
| 0.500 rau 1.000 " | ± 006 " | 12.0-25.0 Nws | ± 0.15 hli |
| 1.000 rau 1.500 " | ± 008 " | 25.0-37.0 Nws | ± 0.20 hli |
| 1.500 rau 2.000 " | ± .010 " | 37.0-50.0 Nws | ± 0.25 hli |
| 2.000-2.500 " | ± .012 " | 50.0 rau 62.0 | ± 0.30 hli |
| 2.500 rau 3.500 " | ± .014 " | 62.0 rau 87.0 | ± 0.35 hli |
| 3.500 rau 5.000 " | ± .017 " | 87.0 rau 125.0 | ± 0.40 hli |
| 5,000 rau 7,500 " | ± .020 " | 125.0 rau 190.0 | ± 0.50 hli |
| 7.500-10.000 " | ± 022 " | 190.0 rau 250.0 | ± 0.57 hli |
| 10,000 rau 12,500 " | ± .025 " | 250.0 rau 312.0 | ± 0.60 hli |
| 12.500-15.000 Nws | ± 028 " | 312.0 rau 375.0 | ± 0.70 hli |
Post lub sij hawm: Feb-03-2021