Muhandislik uchun bepul vosita
Moy yopishqoqligini haroratga bog'liq holda hisoblash kalkulyatori
Walther (ASTM D341) tenglamasidan foydalanib, istalgan haroratda kinematik yopishqoqlikni hisoblang. ASTM D2270 bo'yicha yopishqoqlik indeksi. Optimal ish diapazoni va quyish nuqtasini baholash.
Yopishqoqlik natijalari
Walther tenglamasi (ASTM D341)
Bu yerda ν — kinematik yopishqoqlik mm²/s (cSt) da, T — mutlaq harorat (K), A va B esa ikki ma'lumot nuqtasidan aniqlanadigan doimiylardir.
Yopishqoqlik indeksi (ASTM D2270)
VI compares the oil’s viscosity-temperature behavior to two reference oils: L (VI=0, naphthenic) and H (VI=100, paraffinic). Higher VI = less viscosity change with temperature.
Amaliy Misol
Given: ν₄₀=68 cSt, ν₁₀₀=8.7 cSt
Walther: A=9.3097, B=3.6244
At 80°C (353.15 K): log log(ν+0.7)=9.3097−3.6244×log(353.15)=9.3097−9.2348=0.0749
ν = 10^(10^(0.0749))−0.7 = 14.7 cSt
VI ≈ 98 (odatdagi mineral moy)
ISO VG ma'lumotnoma jadvali
| ISO VG | ν 40°C da (cSt) | ν 100°C da (cSt) | Odatiy qo'llanilishi |
|---|---|---|---|
| VG 10 | 10 | 2.6 | Shpindel moylari, gidravlika |
| VG 22 | 22 | 4.4 | Gidravlik tizimlar |
| VG 32 | 32 | 5.4 | Gidravlika, yengil podshipniklar |
| VG 46 | 46 | 6.8 | Gidravlika, umumiy podshipniklar |
| VG 68 | 68 | 8.7 | Og'ir gidravlika, yengil tishli uzatmalar |
| VG 100 | 100 | 11.4 | Aylanma yog'lash, yengil tishli uzatmalar |
| VG 150 | 150 | 15 | Tishli uzatmalar, podshipniklar |
| VG 220 | 220 | 19 | Sanoat tishli uzatmalari |
| VG 320 | 320 | 24.5 | Og'ir tishli uzatmalar, qurtsimon uzatmalar |
| VG 460 | 460 | 31 | Yuqori yukli tishli uzatmalar |
| VG 680 | 680 | 40 | O'ta og'ir tishli uzatmalar |
| VG 1000 | 1000 | 52 | Open gears |
| VG 1500 | 1500 | 68 | Ochiq tishli uzatmalar, sim arqonlar |
💡 Optimal diapazon: Ko'pgina podshipniklar va tishli uzatmalar 13–100 cSt qiymatida eng yaxshi ishlaydi. 13 cSt dan past bo'lsa chegara yog'lash xavfi mavjud; 100 cSt dan yuqori bo'lsa ortiqcha moyli qarshilik yuzaga keladi.
