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Flange Bolts nwere Dacromet na mkpụrụ flange
2026-10-29
1. Okwu mmalite
Njikọ ọ bụla gbachiri agbachi siri ike dịka onye mmekọ ya na-esighị ike. Ngwunye flange siri ike dị elu jikọtara ya na akị hex nkịtị na-enweghị nchebe na-emepụta a di na nwunye galvanic, ọnyà corrosion, na ọdịda ubi n'ọdịnihu. Edemede a na-ewebata ụzọ abụọ dabara na ya - Dacromet mkpuchi flange bolts (hex bolts na integral flange n'okpuru isi) na Mkpụrụ flange nwere dacromet (hex nuts na a na-atụgharị flange olu akwa) - na-akọwa ihe mere ma ndị òtù nke nkwonkwo kwesịrị iburu otu zinc-aluminom flake mkpuchi.
Dacromet mkpuchi - usoro zinc-flake na-abụghị nke electrolytic akọwapụtara ISO 10683 na ASTM F1136 - na-ebuga awa 700 ruo 1,000 nke nguzogide nnu nnu (ASTM B117 nnu nnu na-anọpụ iche, NSS) na mbụ. ajari uhie, na ihe nkiri 8-12 μm dị mkpa, na-enweghị hydrogen ebrittlement ihe ize ndụ. Tinyere mgbe niile na bolt na aku, ọ na-echebe usoro ihe nkedo niile nke eri: ihe na-ebupụta ya, ihu flange, na eriri dị n'ime na nke mpụga.
2. Akụkụ abụọ ahụ
2.1 Hex flange bolts
Ihe mkpuchi hex flange bụ ihe mkpuchi isi hexagon nwere flange okirikiri agbakwunyere (ihu igwe eji arụ ọrụ) n'elu ebe ebu n'okpuru isi, ahaziri na ISO 4162 / DIN 6921 na GB/T 5789/GB/T 16674. Nhọrọ imewe gụnyere:
- Obere usoro flange- kọmpat na-ebu dayameta maka ebe mkpuchi akpọchi;
- Usoro flange buru ibu (obosara).- dayameta nke ihe dịka 1.5 × d, nke na-ebelata nrụgide elu n'okpuru isi ma belata ntinye n'ime ihe ndị dị nro dị ka ihe nkedo aluminom;
- Flange siri ike- ezé radial na flange dị n'okpuru nke na-ata n'ime elu ahụ kpọgidere, na-abawanye iguzogide ịma jijiji na-ebute onwe ya na-enweghị ihe mgbochi mkpọchi dị iche.
3. Ihe kpatara na usoro dabara adaba maka njikwa corrosion
Ihe mkpuchi zinc-flake nwere mkpuchi na-abanye n'ime akị efu ma ọ bụ electro-plated etolite a di na nwunye galvanic: elu abụọ dị iche iche na kọntaktị na electrolyte (mmiri ozuzo, condensation, nnu okporo ụzọ). N'elu ala mara mma na-emebi emebi nke ọma, na-emepụta ajari ọcha (ngwaahịa oxidation zinc) na n'ikpeazụ ajari uhie (base-steel corrosion) na kpọmkwem ebe kacha dị egwu - eri na-ebu preload. Ikpuchi ma bolt na nut na otu usoro Dacromet na-eme ka ikike corrosion na-ewepụ ma na-ewepụ ike ịkwọ ụgbọala maka mwakpo galvanic.
Usoro Dacromet na-agụnye enweghị acid pickling na enweghị electrolytic ugbu a, n'ihi ya, ọ dịghị atomic hydrogen na-ewebata n'ime ígwè. Nke a na-eme ka ọ bụrụ ọkọlọtọ nhọrọ maka ike dị elu flange bolts na flange akụ nke klaasị 10.9 na 12.9, ebe hydrogen embrittlement (HE) ọdịda nke electro-plated fasteners bụ a akwụkwọ ize ndụ.
4. Ntụle arụmọrụ mkpuchi mkpuchi
| Sistemụ mkpuchi mkpuchi (bolt + nut, klas 8.8) | Ụdị ọkpụrụkpụ | Nnu na-efesa nchara ọcha | Mgbasa nnu na nchara uhie (NSS) | Hydrogen ebrittlement |
| Electro-galvanized Zn5 | 5 μm | ≈ 24h | ≈ 72–96 elekere | Nnukwu ihe ize ndụ |
| Electro-galvanized Zn12 | 12 μm | ≈ 72 h | ≈ 192h | Nnukwu ihe ize ndụ |
| Mechanical galvanizing | 25-40 μm | ≈ 96h | ≈ 400-500 h | Dị ala |
| galvanized na-ekpo ọkụ | 45-85 μm | — | ≈ 720h | Dị ala; eri chọrọ re-tapping, nut oversize |
| Dacromet DAC 320 (Klas 2) | 8 μm | ≈ 240h | ≈ 720h | Ọ fọrọ nke nta ka ọ bụrụ nke ọ bụla |
| Dacromet DAC 500 / nwa | 10-12 μm | ≈ 480h | ≈ 1,000 h | Ọ fọrọ nke nta ka ọ bụrụ nke ọ bụla |
Uru ọgbakọ ọzọ: mkpụrụ osisi galvanized na-ekpo ọkụ ga-akụrịrị nke ukwuu, nke na-ebelata mpaghara nut dị mma, ebe mkpụrụ flange nwere mkpuchi dacromet na-ejigide ọkọlọtọ. 6H eri ndidi na ike zuru oke - nke dị gịrịgịrị, ihe nkiri siri ike na-echekwa eri dabara adaba, yabụ bolts na mkpụrụ na-ezukọta kpamkpam na esemokwu na-agbanwe agbanwe na enweghị. na-egbu egbu nke mkpuchi elu.
5. Mmechi
Dacromet mkpuchi flange bolts na flange nuts na-etolite usoro ntinye nke injinia: geometry flange na-ekesa mwekota ibu, na-ebelata ịma jijiji, na-ewepụkwa washers dị iche iche, ebe mkpuchi zinc-aluminom flake na ndị otu abụọ ahụ na-egbochi ndị di na nwunye galvanic, mechie mpaghara crevice, na-eguzogide nchara na-acha ọcha na nchara na-acha ọbara ọbara - maka 70000. ígwè free nke hydrogen ebrittlement. Otu iwu nkọwapụta kacha mkpa ka dị: tụọ bolts na mkpụrụ dị ka otu dabara, sistem na-echekwa corrosion.
