Bolt anti -} loosening, anti - corrosion, thiab siv zog torque
- Dab tsi yog lub hauv paus rau kev teeb tsa 60 -} haul rauv taws ob npaug thiab cov txiv ntoo los tiv thaiv?
Lub hauv paus: 60-116% ntawm cov txiv ntoo tseem ceeb kom tiv thaiv 10-20hz kev co loosening yam tsis muaj kev puas tsuaj (tsawg dua los yog sib npaug). Kev Txhim Kho: Torque Luv 25% → 8% hauv 3 lub hlis, kev txo me txhua xyoo 12% → 3%. Zawm cov txiv ntseej ua ntej, tom qab ntawd kaw cov txiv ntseej, coj mus kuaj ntau dua lossis sib npaug nrog rau 20% nrog lub zog cua (tsawg dua lossis sib npaug ntawm 10% sib txawv).
- Dab tsi yog cov tseem ceeb anti - corrosion zoo ntawm 80}}}} roj av zoo li lawv haum rau?
Cov txiaj ntsig: ① 1000h vs {{{}} hill txau tsis kam, corrosion tus nqi 0.02 → 0.005mm / xyoo hauv ntug hiav txwv; ② 180 Degree khoov tsis muaj tev (vs. galvanizing tawg); Tsis muaj hydrogen embrittlement (5% → 0.5% sawb tus nqi). Haum rau ntug dej hiav txwv, tshuaj lom neeg, thiab thaj chaw alpine, lub neej txuas mus rau 15 xyoos (5 xyoos ntev dua li galvanizing).
- What causes >15% bolt torque lwj (450 → 380 → 380), thiab yuav ua li cas tswj nws ntawm cov txheej txheem ua kom zoo?
Causes: ① >0.2mm xov tshem tawm; ② Tsis muaj kev sib txhuam (± 0.05) tsis muaj roj; ③ Unrection zawm. Kev ua kom zoo: ① Siv 0.1 - 0.15mm clearance bolts, qauv 10%; ② Thov mo - raws li roj (0.12-0-0.15 txhuam); ③ "Thawj npe (200Nus) -Reemenessing (450N · m)" Cawv sib txawv. Txo kom lwj rau<8% in 1 month, stable 200±20kN preload.
- Yuav kho bolts nrog 0.1mm Xov Rust (24 → 23.8mm INCH) rau kev rov siv dua tshiab, thiab kev ntsuas tom qab kho?
Cov kauj ruam: ‡ Tshem tawm xeb, soak hauv 10% oxalic acid rau 10 feeb; ② Cov xov zoo rau Ra tsawg dua lossis sib npaug rau 6.3μm; ③ Thov Siv -40 Qib rau 120 Degree Grease; ④ Tefes kom 450hnen · m. Kev Ntsuam Xyuas: ① 23.8 ± 0.1mm lub suab seev; Ntau dua los yog sib npaug rau 750MPA tensile lub zog; ③ tsawg dua li lossis sib npaug rau 10% Torque txoj kab tsib hlis 100,000 mus; ④ 48h tshuaj txau tsis kam. Kav 5 xyoos, txuag 80% nqi.
- Dab tsi yog daim ntawv thov sib txawv ntawm 40Cr, 35Crmo, thiab 20mntib bolts nyob rau hauv hnyav {} haul railways, thiab dab tsi yog lub hauv paus?
Qhov sib txawv: ① 40Cr (800-900MPA, ntau dua lossis sib npaug nrog 30j / cmo kab): kab ntxiv (<8000Mt), ￥12/piece, 8-year life; ② 35CrMo (900-1000MPa, ≥40J/cm²): Main lines (8000-12000Mt), 20-30Hz vibration resistance, 12-year life; ③ 20MnTiB (1000-1100MPa, ≥35J/cm²): Extra heavy-haul (>12000mt), 250k preload, 0.08mm / xyoo hnav, 15 - xyoo lub neej. Bases los ntawm thauj khoom - kev co-ua kev sib txuam, tsawg dua lossis sib npaug ntawm 2% ua tsis tiav.