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Dacromet-Coated Flange Bolts thiab Flange Ceev
2026-10-29 IB
1. Taw qhia
Txhua qhov sib koom bolted tsuas yog muaj zog raws li nws tus khub tsis muaj zog tshaj plaws. Lub siab muaj zog flange ntsia liaj qhov rooj nrog ib qho tsis muaj kev tiv thaiv zoo tib yam hex txiv ntoo tsim galvanic ob peb, lub cuab yeej corrosion, thiab yav tom ntej teb tsis ua hauj lwm. Kab lus no qhia txog kev sib tw ua khub - Dacromet-coated flange bolts (hex bolts nrog ib qho flange hauv qab lub taub hau) thiab Dacromet-coated flange ceev (cov txiv ntseej hex nrog lub caj dab flange tig) - thiab piav qhia vim li cas ob leeg cov tswv cuab ntawm kev sib koom tes yuav tsum nqa tib lub zinc-aluminium flake txheej.
Dacromet txheej - cov txheej txheem uas tsis yog electrolytic zinc-flake txhais los ntawm ISO 10683 Kev Tswj Xyuas Kev Lag Luam thiab ASTM F 1136 Cov Lus Qhia - xa 700 mus rau 1,000 xuab moos ntawm ntsev tsuag tshuaj tiv thaiv (ASTM B117 nruab nrab ntsev tsuag, NSS) ua ntej liab xeb, hauv nyias 8-12 μm zaj duab xis, tsis muaj hydrogen embrittlement pheej hmoo. Siv tsis tu ncua rau bolt thiab txiv ntseej, nws tiv thaiv tag nrho cov threaded fastening system: cov kabmob nto, lub ntsej muag flange, thiab cov kabmob load-cov kabmob sab hauv thiab sab nraud.
2. Ob Cheebtsam
2.1 Hex flange bolts
Hex flange ntsia liaj qhov rooj yog lub taub hau hexagon ntsia liaj qhov rooj nrog ib qho kev sib txuas flange (built-in washer ntsej muag) ntawm lub taub hau bearing nto, standardized hauv TS EN ISO 4162 / DIN 6921 thiab GB/T 5789/GB/T 16674. Cov kev xaiv tsim muaj xws li:
- Me flange series- compact bearing txoj kab uas hla rau confined ntsia liaj qhov rooj qhov chaw;
- Loj (dav) flange series- bearing txoj kab uas hla ntawm kwv yees li 1.5 × d, uas txo qis nto siab nyob rau hauv lub taub hau thiab txo embedded rau hauv cov ntaub ntawv mos xws li txhuas castings;
- Serrated flange- cov hniav radial ntawm lub flange hauv qab uas tom rau hauv qhov chaw clamped, nce kev tiv thaiv rau kev vibration-induced nws tus kheej-loosing yam tsis muaj lub tshuab ntxhua khaub ncaws cais.
3. Yog vim li cas qhov Matched System Matters rau Corrosion Control
Ib lub zinc-flake-coated bolt khiav mus rau hauv ib qho liab qab lossis electro-plated txiv ntoo daim ntawv a galvanic ob peb: ob qhov sib txawv ntawm qhov sib cuag nrog ib qho electrolyte ( nag, condensation, txoj kev ntsev). Qhov tsawg noble nto corrodes preferentially, generating dawb xeb (zinc oxidation khoom) thiab thaum kawg liab xeb (base-steel corrosion) raws nraim qhov chaw tseem ceeb tshaj plaws - cov xov uas nqa lub preload. Txheej ob lub ntsia liaj qhov rooj thiab cov txiv ntoo nrog tib lub Dacromet system sib npaug ntawm qhov muaj peev xwm corrosion thiab tshem tawm lub zog tsav rau galvanic nres.
Cov txheej txheem Dacromet tsis muaj kua qaub thiab tsis muaj electrolytic tam sim no, yog li tsis muaj atomic hydrogen nkag rau hauv cov hlau. Qhov no ua rau nws tus qauv xaiv rau lub zog siab flange bolts thiab flange ceev ntawm cov cuab yeej chav kawm 10.9 thiab 12.9, qhov twg hydrogen embrittlement (HE) tsis ua hauj lwm ntawm electro-plated fasteners yog ib qho kev pheej hmoo ntawm cov ntaub ntawv.
4. Txheej kev ua tau zoo sib piv
| Txheej txheej (bolt + txiv ntseej, chav kawm 8.8) | Hom tuab | Ntsev tsuag rau dawb xeb | Tshuaj tsuag ntsev rau liab xeb (NSS) | Hydrogen embrittlement |
| Electro-galvanized Zn5 | 5m ua | ≈ 24 h | ≈ 72–96 h | Kev pheej hmoo siab |
| Electro-galvanized Zn12 | 12m ua | ≈ 72 h | ≈ 192 h | Kev pheej hmoo siab |
| Mechanical galvanizing | 25-40 m | 96h ib | ≈ 400–500 h | Tsawg |
| Kub-dip galvanized | 45-85 hli | — | ≈ 720 h | Tsawg; threads yuav tsum rov tapping, txiv ntseej oversize |
| Dacromet DAC 320 (Class 2) | 8m ua | ≈ 240 h | ≈ 720 h | Zoo tsis muaj |
| Dacromet DAC 500 / dub | 10-12 m | ≈ 480 h | ≈ 1,000 h | Zoo tsis muaj |
Ib qho txiaj ntsig kev sib dhos ntxiv: cov txiv ntoo kub-dip galvanized yuav tsum tau tapping oversize, uas txo cov txiv ntoo zoo shear cheeb tsam, whereas Dacromet-coated flange ceev tuav tus qauv. 6H xov kam rau ua thiab tag nrho lub zog - lub nyias, tawv zaj duab xis khaws cov xov haum, yog li bolts thiab txiv ntseej sib sau ua ke ywj pheej nrog kev sib txhuam thiab tsis muaj siab ntawm cov coated nto.
5. Xaus
Dacromet-coated flange bolts thiab flange ceev tsim ib qho kev sib txuas ua ke: lub flange geometry faib clamp load, suppresses vibration loosening, thiab tshem tawm cov ntxhua khaub ncaws, thaum sib tw zinc-aluminium flake txheej ntawm ob tus tswv cuab tiv thaiv cov khub niam txiv galvanic, ntsaws cov kab nrib pleb, tiv thaiv xeb dawb, 0-0 teev thiab xim liab. ua kom muaj zog hlau tsis muaj hydrogen embrittlement. Ib txoj cai tseem ceeb tshaj plaws yog tseem: xaj cov bolts thiab cov txiv ntoo ua ib qho kev sib tw, tiv thaiv corrosion.
