Dacromet Hex Nuts-Technical Taw Qhia 

1. Taw qhia

Hexagonal txiv ntoo (hex txiv ntseej) yog cov feem ntau siv fasteners nyob rau hauv txhua yam sib dhos, kev tsim kho, tsheb, thiab kev siv tshuab. Thaum ua ke nrog cov kev kho saum npoo zoo xws li Dacromet txheej, lawv xa cov kev tiv thaiv corrosion tshwj xeeb thaum tswj xyuas qhov zoo ntawm qhov ntev thiab kev ua haujlwm zoo.

1.1 Hex ceev yog dab tsi?

Ib tug hex txiv ntseej yog ib hom fastener nrog ib tug hexagonal sab nrauv duab thiab ib tug internally threaded qhov. Tus tsim rau rau sab tso cai rau kev siv lub zog zoo siv cov qauv wrenches lossis cov qhov (sockets). Hex txiv ntseej feem ntau yog tsim los raws li cov qauv thoob ntiaj teb xws li ISO 4032 (style 1 cov txiv ntseej), DIN 934, lossis ASME B18.2.2, npog ntau yam metric thiab imperial ntau thiab tsawg.

Cov yam ntxwv geometric tseem ceeb muaj xws li cov xov nominal txoj kab uas hla (d), suab (P), dav thoob plaws flats (s), dav hla cov ces kaum (e), thiab txiv ntseej qhov siab (m). Cov chav kawm khoom vaj khoom tsev (piv txwv li, 8, 10, 12 rau cov hlau) txhais cov cuab yeej siv zog kom phim cov qhab nia sib xws.

1.2 Txheej txheem cej luam ntawm Dacromet Txheej

Dacromet yog dej-raws li, tsis-electrolytic zinc-aluminium flake txheej tsim nyob rau hauv 1970s. Nws muaj cov zinc dispersed zoo thiab txhuas flakes raug tshem tawm nyob rau hauv ib qho inorganic chromate (los yog chromium-dawb) binder. Siv feem ntau los ntawm dip-spin los yog tshuaj tsuag txoj kev thiab kho ntawm kwv yees li 280-320 ° C, nws tsim ib daim nyias nyias (feem ntau yog 5-12 μm), sib xws, nyiaj-grey tiv thaiv zaj duab xis.

Tsis zoo li cov tsoos electroplating los yog kub-dip galvanizing, Dacromet muab kev tiv thaiv corrosion zoo tshaj yam tsis muaj hydrogen embrittlement txaus ntshai - ua rau nws tshwj xeeb tshaj yog haum rau high-strength fasteners (qib 10.9 thiab 12.9).

2. Dacromet Txheej Technology

2.1 Kev sib xyaw thiab cov qauv

Cov txheej txheej yog tsim los ntawm txheej txheej txheej ntawm zinc thiab txhuas flakes khi los ntawm ib qho inorganic matrix. Cov qauv lamellar no tsim ntau yam kev tiv thaiv lub cev tiv thaiv ya raws thiab corrosive ions, thaum zinc muab kev tiv thaiv kev txi (galvanic). Aluminium txhim khu kev tiv thaiv kev tiv thaiv thiab kub ua hauj.

Daim duab 2. Simplified ntau txheej txheej ntawm Dacromet txheej ntawm steel substrate

2.2 Cov txheej txheem thov

Cov txheej txheem ib txwm ua ntu zus yog:

1. Kev npaj nto - alkaline degreasing thiab abrasive tu (tsis muaj kua qaub pickling).
2. Daim ntawv thov txheej - dip-spin los yog tshuaj tsuag ntawm dej-raws li zinc-aluminium slurry.
3. Centrifuging - tshem tawm cov txheej dhau los kom ntseeg tau tias cov tuab tuab.
4. Curing - ci ntawm ~ 300 ° C rau 15-30 feeb los tsim cov zaj duab xis ntom ntom. Ntau lub tsho loj tuaj yeem siv rau qib siab dua.

2.3 Qhov zoo tshaj plaws

• Qhov zoo tshaj plaws corrosion kuj: 1,000-2,000+ xuab moos ntsev tsuag (ASTM B117) rau liab xeb - feem ntau 5-10 npaug zoo dua tus qauv zinc plating.
• Tsis muaj hydrogen embrittlement: Cov txheej txheem tsis-electrolytic muaj kev nyab xeeb rau cov hlau muaj zog (10.9 / 12.9).
• Txheej nyias (5-12 μm): Khaws cov xov haum thiab qhov tseeb ntawm qhov ntev; tsis xav tau overtapping.
• Kev kub siab ua haujlwm: ruaj khov mus txog 300 ° C kev pabcuam txuas ntxiv.
• Uniform coverage: Zoo heev nkag mus rau hauv recesses, threads, thiab complex geometry ntawm dip-spin.
• Kev sib txhuam coefficients sib xws: tuaj yeem ua ke nrog lubricated topcoats rau kev tswj torque-nrawm kev ua haujlwm.

Daim duab 3. Kev sib piv ntawm cov ntsev-txhaj tshuaj ua haujlwm

2.4 Sib piv nrog Lwm Cov Txheej Txheem

Table 1. Kev sib piv ntawm cov txheej txheem fastener

3. Hex Ceev - Cov Qauv, Qhov Loj & Lub Zog

3.1 International Standards

Cov qauv zoo tshaj plaws rau metric hex txiv ntseej yog ISO 4032 (style 1 cov txiv ntseej tsis tu ncua) thiab cov laus dua tab sis tseem siv dav dav DIN 934. Cov qauv no txhais qhov ntev, qhov ntev, thiab cov khoom qib (A, B, C). Cov chav kawm rau cov txiv ntoo steel tau teev tseg hauv ISO 898-2 (piv txwv li, chav kawm 6, 8, 10, 12).

Lus Cim: DIN 934 thiab ISO 4032 sib txawv me ntsis nyob rau hauv qhov ntev ntawm lub tiaj tiaj rau qee qhov ntau thiab tsawg (piv txwv li, M10, M12, M22). Nco ntsoov xyuas kev sib raug zoo thaum sib xyaw cov qauv.

3.2 Cov Metric Dimensions (ISO 4032 Style 1)

Rooj 2. Xaiv metric hex txiv ntseej qhov ntev (ISO 4032, mm). s = dav thoob cov flats; e = dav hla cov ces kaum; m = txiv ntseej qhov siab.

3.3 Chav Kawm Khoom & Kev Sib Tw

Cov txiv ntseej yuav tsum tau muab sib xyaw ua ke rau lub zog bolt kom ntseeg tau tias kev sib koom ua tsis tau raws li kev tswj hwm (xws li hauv lub bolt). Kev sib koom ua ke raws li ISO 898-2:

• Bolt chav kawm 8.8 → Txiv ntseej chav kawm 8 lossis siab dua
• Bolt chav kawm 10.9 → Txiv ntseej chav kawm 10 lossis siab dua
• Bolt chav kawm 12.9 → Txiv ntseej chav kawm 12

Dacromet txheej yog tshwj xeeb tshaj yog muaj nqis rau chav kawm 10 thiab 12 neeg rau vim hais tias cov txheej txheem qhia tsis muaj hydrogen embrittlement txaus ntshai uas yuav cuam tshuam cov ntaub ntawv uas muaj zog.

4. Daim ntawv thov ntawm Dacromet Hex Ceev

Dacromet-coated hex txiv ntseej ua tau zoo nyob txhua qhov chaw muaj kev tiv thaiv corrosion, qhov ntev precision, thiab kev ntseeg siab ntawm cov neeg kho tshuab ib txhij:

Automotive & Tsheb thauj mus los

Chassis Cheebtsam, ncua kev kawm ntawv, nres lub rooj sib txoos, cav fasteners, thiab underbody seem raug rau txoj kev ntsev thiab kub.

Cua Zog & Infrastructure

Ntauwd bolts thiab lub hauv paus fasteners rau onshore thiab offshore cua turbines, qhov twg ntsev-spray raug tshaj 2,000 teev ntawm kev tiv thaiv yuav tsum tau.

Kev tsim kho & Lub tshuab hnyav

Cov qauv kev sib txuas, cov khoom siv ua liaj ua teb, cov tshuab mining, thiab kev teeb tsa sab nraum zoov raug rau huab cua thiab tshuaj lom neeg.

Marine & Chemical Environments

Deck hardware, offshore platforms, thiab cov txheej txheem txheej txheem uas cov txheej txheem ib txwm degrade sai.

4.1 Cov txheej txheem xaiv

Rooj 3. Cov lus qhia ceev ceev rau coated hex ceev

5. Cov lus xaus

Dacromet hex txiv ntseej muab cov neeg kho tshuab kev ntseeg tau thiab cov qauv geometry ntawm tsoos hexagonal txiv ntseej nrog kev tiv thaiv corrosion siab heev ntawm zinc-aluminium flake technology. Lawv cov txheej txheej nyias nyias khaws cov xov kev sib koom ua ke thiab lub zog sib xws, thaum xa cov tshuaj tsuag ntsev kom zoo dua li cov pa zinc plating thiab tsis muaj kev txhawj xeeb ntawm hydrogen-embrittlement.

Rau cov kws tsim khoom thiab cov neeg yuav khoom hais txog cov khoom siv rau tsheb, lub zog tauj dua tshiab, kev tsim kho vaj tse, lossis chaw ua haujlwm hnyav, Dacromet-coated hex txiv ntseej muab cov pov thawj sib npaug ntawm kev ua haujlwm ntev, kev ua tau zoo, thiab kev ua haujlwm ntev.

Thaum xaiv cov khoom, nco ntsoov paub meej tias qib txheej (A / B lossis sib npaug), kev ntsuas ntsev-txheej, kev sib txhuam coefficient (yog tias lubricated topcoat yog siv), thiab kev sib raug zoo nrog mating bolt chav kawm thiab ib puag ncig ntawm daim ntawv thov zaum kawg.

Daim ntawv pov thawj & Cov Qauv: ISO 4032, ISO 898-2, DIN 934, ASTM B117, cov ntaub ntawv chaw tsim khoom rau Dacromet / zinc-flake systems (xws li DACROMET®, GEOMET®).