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Ihe mkpuchi mkpuchi isi mkpuchi dacromet
2026-11-03
1. Okwu mmalite
skru isi okpu, nke dabara na ya ISO 4762 / DIN 912 - bụ bolts nke nhọrọ n'ebe ọ bụla nnukwu njigide ibu, kọmpat isi, na kpọmkwem torque njikwa gbakọtara. N'ihi na a na-arụpụtakarị ha na klaasị 8.8, 10.9 na ọkachasị 12.9, bolts ndị a na-arụ ọrụ na pasentị dị elu nke ike mkpụrụ ha, na otu ike ahụ na-eme ka ha nwee ike ịnweta ya. hydrogen ebrittlement, nrụgide corrosion cracking, na nchara malitere na isi fillet na hex soket mgbidi.
Dacromet mkpuchi - ndị na-abụghị electrolytic zinc-aluminom flake usoro akọwara site ISO 10683 na ASTM F1136 - na-ekwu kpọmkwem adịghị ike ndị a. N'ime ihe nkiri dị gịrịgịrị 8-12 μm ọ na-ebuga awa 720 ruo 1,000 nke nguzogide nnu na mbụ. ajari uhie (ASTM B117 NSS), anaghị emepụta ihe egwu ọ bụla hydrogen embrittlement n'oge nhazi, ma na-echekwa geometry hex ziri ezi. 6g eri ndidi na kposara okpu isi oghere na-adabere na.
2. Bolt geometry na atụmatụ atụmatụ
Ihe nkedo okpu isi sọket bụ bolt nwere ike zuru oke nwere isi cylindrical yana mbanye oghere hexagon dị n'ime:
- Isi cylindricalya na a knuru elu okirikiri; dayameta isi dk ≈ 1.5 × d - ihe dị ka 30–40% pere mpe karịa ihe mkpuchi isi hexagon nke otu nha, na-ekwe ka kọmpat, usoro ihe mkpuchi dị nso;
- Isi-na-shank fillet, mpaghara mgbanwe ike ọgwụgwụ-dị oke mkpa ebe nrụgide nrụgide kachasị elu;
- Eriri zuru oke ma ọ bụ eri akụkụụdị (smooth shank) ụdị; skru akụkụ-thread na-etinye ụgbọ elu ịkwa akwa na shank na-enweghị eriri maka ikike ịkwa akwa dị elu;
- Ntụnye dị iche iche: flat (chamfered) ọkọlọtọ ọkọlọtọ; ebe nkịtana ebe cone maka ebe na ọrụ mkpọchi.
E jiri ya tụnyere hex bolts, SHCS na-emepụta elu buo ụzọ n'ihi na otu torque ekele mbanye socket nke ọma, na ha na-arụnyere na hex igodo, torque wrenches, ma ọ bụ kwadoro hex ọkwọ ụgbọala - na-eme ka ha ọkọlọtọ bolts na igwe ngwá ọrụ, injection molds, hydraulic manifolds, jigs na fixtures, na robotics.
3. Ntụle arụmọrụ corrosion
| Mkpuchi na klaasị 8.8-12.9 SHCS | Ọkpụrụkpụ | Mgbasa nnu na nchara uhie (ASTM B117) | Ihe egwu embrittlement hydrogen | Ihe ndetu |
| Black oxide (agbaji), mmanụ | <1 μm | <24 awa | Ọ dịghị | Ihe ịchọ mma naanị; mmanụ na-asachapụ |
| Zinc phosphate + mmanụ | 3-5 μm | ≈ 48–72 elekere | Ọ dịghị | Izu “oji” nkịtị, ndụ nwere oke |
| Electro-galvanized Zn12, Cr(VI) - efu | 12 μm | ≈ 192h | Elu (12.9 anaghị atụ aro ya) | Socket na eri dị mkpa |
| Zinc-nickel alloy electro-plate | 8-12 mm | ≈ 480-720 h | Na-agafeghị oke | Ọnụ ego dị elu; chọrọ post-eme achịcha |
| Dacromet DAC 320 (Klas 2) | 8 μm | ≈ 720h | Ọ fọrọ nke nta ka ọ bụrụ nke ọ bụla | Silver agba ntụ |
| Dacromet DAC 500 / nwa | 10-12 μm | ≈ 1,000 h | Ọ fọrọ nke nta ka ọ bụrụ nke ọ bụla | Ngwucha ojii dabara usoro ojii |
6. Ụkpụrụ na Ụdị Ngwaahịa a na-ahụkarị
Ụkpụrụ isi: ISO 4762 / DIN 912 (skru isi okpu oghere), ISO 898-1 (mechanical Njirimara), ISO 10683:2018 (ihe mkpuchi zinc flake na-abụghị electrolytic), ASTM F1136, ASTM B117, ISO 4042 (electrolating na HE nduzi), DIN 267-28 na GB/T 70.1 / GB/T 5267.3.
| Oke | Ọnụ ọgụgụ nkịtị |
| Dayameta | M3 – M42 (Mba.4 – 1-1/2) |
| Ogologo | 6 - 300 mm, eri zuru oke ma ọ bụ eriri akụkụ |
| Klas ihe onwunwe | 8.8 / 10.9 / 12.9 |
| Ụdị isi | Standard (ISO 4762), isi ala (DIN 6912), isi knwed |
| Ntụtu aka | Ebe dị larịị / ebe nkịta / ebe cone |
| Mkpuchi | DAC 320 / DAC 400 / DAC 500; ọlaọcha isi awọ ma ọ bụ nwa; Cr (VI) - efu |
| Nkwenye eriri | 6g, eri kpuchiri na-enweghị ịpịgharị ọzọ |
7. Ngwa na ntụzịaka nhọrọ
1.Match mkpuchi na ike: maka klas 10.9 na 12.9 bolts, na-esi ọnwụ na-abụghị electrolytic zinc flake (Dacromet / Geomet) iji kpochapụ hydrogen embrittlement;
2.Dochie oji oxide nke ọma: ezipụta Dacromet ojii mgbe ndị ahịa chọrọ ka anya ojii jiri ezigbo nchebe nchara;
3.Verify mkpuchi mkpuchisite na NSS awa (DAC 320 ≈ 720 h; DAC 500 ≈ 1,000 h) ma rịọ maka akụkọ nyocha nke onye na-emepụta mkpuchi;
4.Confirm Cr (VI) - passivation efu(chromium trivalent) maka nnabata RoHS / ELV;
5. Lelee data esemokwu: nweta nut factor na coefficient-of-fcriction report for torque-controlled mgbakọ;
6. Mezue usoro: jiri mkpụrụ ekpuchiri ekpuchi, igwe ịsa akwa na ihe ntinye nke nwere ike dakọtara iji zere ihe nrụnye nwere ike ịmekọrịta.
8. Nkwubi okwu
Dacromet mkpuchi mkpuchi mkpuchi isi mkpuchi mkpuchi na-ejikọta usoro ọrụ dị mma nke ebumnuche izugbe siri ike - kọmpat cylindrical isi, mbanye hex soket nke ọma, ikike preload dị elu - yana sistemu mkpuchi emebere maka isi ihe adịghị ike: enweghị hydrogen embrittlement na 12.9 nchara, n'ime oghere na oghere na-acha uhie uhie, mkpuchi na-acha uhie uhie na ebe a na-agbagharị agbagharị. nkwụsi ike esemokwu maka mgbakọ ziri ezi. A kọwapụtara ya nke ọma, ha na-ebuga awa ịgba nnu 720-1,000 n'ime ihe nkiri 8-12 μm, na-eweta ọdịdị gbara ọchịchịrị, matte nke bolts gbara oji n'ime ezigbo ihe mgbochi corrosion.
