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Dacromet-Coated Flange Bolts uye Flange Nuts
2026-10-29
1. Nhanganyaya
Majoini ese akasungwa anongosimba semumwe waro asina kusimba. Iyo yakakwirira-yakasimba flange bhaudhi yakasanganiswa neasina kudzivirirwa yakajairwa hex nati inogadzira a galvanic vaviri, musungo wekuora, uye kukundikana kwemunda mune ramangwana. Ichi chinyorwa chinosuma vaviri vakafanana - Dacromet-yakavharwa flange mabhoti (hex mabhoti ane yakakosha flange pasi pemusoro) uye Dacromet-yakavharwa flange nzungu (hex nuts ine collar inotenderera yeflange) - uye inotsanangura kuti sei nhengo dzese dzejoini dzichifanira kutakura zvakafanana zinc-aluminium flake coating.
Dacromet coating - iyo isiri-electrolytic zinc-flake process inotsanangurwa na ISO 10683 uye ASTM F1136 - inopa mazana manomwe kusvika kumaawa e1,000 emunyu wekupfapfaidza kuramba (ASTM B117 neutral salt spray, NSS) kutanga ngura tsvuku, mune yakaonda 8-12 μm firimu, isina hydrogen embrittlement ngozi. Yakaiswa nguva dzose kubhaudhi uye nut, inodzivirira iyo yese yakarukwa yekusimbisa sisitimu: iyo inotakura nzvimbo, zviso zveflange, uye inotakura-inotakura tambo dzemukati nekunze.
2. Zvikamu Zviviri
2.1 Hex flange mabhaudhi
Hex flange bhaudhi ine hexagon musoro bhaudhi ine yakabatanidzwa denderedzwa flange (yakavakirwa-mukati washer chiso) pazasi-musoro inotakura nzvimbo, yakamisikidzwa mukati. ISO 4162 / DIN 6921 uye GB/T 5789 / GB/T 16674. Design sarudzo dzinosanganisira:
- Small flange series- compact bearing dhayamita yenzvimbo dzakavharirwa mabhaudhi;
- Yakakura (yakafara) flange series- inotakura dhayamita ingangoita 1.5 × d, iyo inoderedza kudzvanywa kwepamusoro pasi pemusoro uye inoderedza kunyura mumidziyo yakapfava senge aluminium castings;
- Serrated flange- mazino eradial paflange pasi anoruma munzvimbo yakasungirirwa, achiwedzera kuramba kune vibration-induced kuzvisunungura pasina yakasarudzika yekukiyiwa washer.
3. Sei Matched System Iine Nyaya Yekuora Kudzora
Zinc-flake-yakavharwa bhaudhi inomhanya ichienda isina chinhu kana electro-plated nati inoumba a galvanic vaviri: nzvimbo mbiri dzakasiyana dzakasangana ne electrolyte (mvura, condensation, mugwagwa munyu). Iyo isinganyanyi kunaka inoora zviri nani, ichigadzira ngura chena (zinc oxidation zvigadzirwa) uye pakupedzisira ngura tsvuku (base-steel corrosion) panzvimbo inonyanya kukosha - tambo dzinotakura preload. Kupfekedza zvese bhaudhi uye nati neiyo yakafanana Dacromet system inoenzana nekugona kuita ngura uye inobvisa simba rekutyaira galvanic kurwisa.
Iyo Dacromet process inosanganisira isina asidi pickling uye hapana electrolytic ikozvino, saka hapana atomic hydrogen inounzwa musimbi. Izvi zvinoita kuti ive sarudzo yakajairwa kune yakakwirira-simba flange mabhaudhi uye flange nzungu dzepfuma kirasi 10.9 uye 12.9, uko hydrogen embrittlement (HE) kutadza kwemagetsi-plated fasteners injodzi yakanyorwa.
4. Coating Performance Kuenzanisa
| Coating system (bhaudhi + nzungu, kirasi 8.8) | Typical ukobvu | Kupfapfaidza munyu kuti chena ngura | Kupfapfaidza munyu kune tsvuku tsvuku (NSS) | Hydrogen embrittlement |
| Electro-galvanized Zn5 | 5 μm | ≈ 24 h | ≈ 72–96 h | Dambudziko guru |
| Electro-galvanized Zn12 | 12 μm | ≈ 72 h | ≈ 192 h | Dambudziko guru |
| Mechanical galvanizing | 25–40 μm | ≈ 96 h | ≈ 400-500 h | Low |
| Kupisa-kunyura kwakabatiswa | 45–85 μm | — | ≈ 720 h | Low; shinda dzinoda kudzokororwa, nut oversize |
| Dacromet DAC 320 (Kirasi 2) | 8 μm | ≈ 240 h | ≈ 720 h | Zvinenge hapana |
| Dacromet DAC 500 / dema | 10–12 μm | ≈ 480 h | ≈ 1,000 h | Zvinenge hapana |
Imwezve bhenefiti yegungano: hot-dip galvanized nuts dzinofanirwa kukwizwa zvakanyanya, izvo zvinoderedza nzvimbo yekugera nzungu, nepo Dacromet-yakavharwa flange nzungu dzinochengeta mwero. 6H thread kushivirira uye kusimba kwakazara - iyo yakaonda, yakaoma firimu inochengetedza shinda yakakodzera, saka mabhaudhi nenzungu zvinoungana zvakasununguka nekukakavadzana kunoenderana uye kwete. galling yenzvimbo dzakaputirwa.
5. Mhedziso
Dacromet-yakavharidzirwa flange mabhoti uye flange nzungu zvinogadzira enjiniya yekusimbisa sisitimu: iyo flange geometry inogovera clamp mutoro, inodzvanya vibration kusunungura, uye inobvisa yakaparadzana washers, nepo inofananidzwa zinc-aluminium flake yekuputira panhengo dzese idzi inodzivirira galvanic vakaroora, inovhara nzvimbo dzakatsemuka, inodzivirira chena pfuti uye inodzivirira ngura chena kwemaawa, 7. inochengetedza simbi yakasimba isina hydrogen embrittlement. Iyo imwechete inonyanya kukosha yekutsanangurwa mutemo inosara: odha mabhaudhi uye nzungu seimwe inofananidzwa, corrosion-protected system.
