{"id":2048,"date":"2026-04-10T09:07:01","date_gmt":"2026-04-10T09:07:01","guid":{"rendered":"https:\/\/helicalcutgears.top\/?post_type=product&p=2048"},"modified":"2026-04-10T09:07:01","modified_gmt":"2026-04-10T09:07:01","slug":"heavy-machinery-double-helical-gear-cast-steel-soft-tooth-flank-qt-iso-grade-8-9","status":"publish","type":"product","link":"https:\/\/helicalcutgears.top\/bs\/product\/heavy-machinery-double-helical-gear-cast-steel-soft-tooth-flank-qt-iso-grade-8-9\/","title":{"rendered":"Dvostruki spiralni zup\u010danik za te\u0161ke ma\u0161ine \u2014 Lijevani \u010delik s mekim bo\u010dnim zubom, QT, ISO klasa 8\u20139"},"content":{"rendered":"
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Dvostruki spiralni zup\u010danik te\u0161ke ma\u0161inerije - Pregled<\/h2>\n

When a gear is large enough that the blank weight approaches or exceeds five tonnes, the forging route that is standard for small and medium industrial gears becomes impractical or prohibitively expensive. The largest gears in the world \u2014 ball mill ring gears three metres in diameter, cement mill main pinions with face widths of 700mm, ship propulsion gears transmitting 20,000+ kW \u2014 are manufactured from cast steel blanks, where the complexity of the part’s final shape can be incorporated into the mold rather than laboriously machined from a forged cylinder. Korea Ever-Power Worm Gear Co.,Ltd supplies Dvostruki spiralni zup\u010danici za te\u0161ke ma\u0161ine<\/strong> u livenim \u010deli\u010dnim \u010deli\u010dnim proizvodima po narud\u017ebi, kaljenim i otpu\u0161tenim do mekog stanja bo\u010dnih strana zuba, odvaljanim do ta\u010dnosti ISO stepena 8-9, za najzahtjevnije primjene u velikim industrijskim pogonima.<\/p>\n

\"Dvostruki<\/p>\n

The double helical (herringbone) tooth form is particularly well-suited to heavy machinery applications because it eliminates the axial thrust force that a single helical gear of equivalent size and helix angle would transmit to the shaft and bearings. For a large mill drive gear transmitting several megawatts, this axial force would be substantial \u2014 requiring large, expensive thrust bearings or roller-type spherical bearings at both ends of the gear shaft. The double helical configuration removes this requirement entirely, allowing simpler bearing arrangements in very large gearbox housings where bearing accessibility and replacement cost are significant lifecycle concerns. Korea Ever-Power’s Dvostruki spiralni zup\u010danici za te\u0161ke ma\u0161ine<\/strong> are custom-manufactured to each client’s drawing \u2014 module, tooth count, helical angle, pressure angle, face width, bore, and keyway dimensions are all specified by the customer. International steel grade cross-reference is supported for customers specifying materials in ASTM, DIN, JIS, or ISO standards.<\/p>\n

Tehni\u010dke specifikacije<\/h2>\n

Specifikacije proizvoda \u2014 Dvostruki spiralni zup\u010danik za te\u0161ke ma\u0161ine<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parametar<\/th>\nVrijednost<\/th>\n<\/tr>\n
Vrsta zup\u010danika<\/td>\nDvostruki spiralni zup\u010danik (zup\u010danik u obliku riblje kosti)<\/td>\n<\/tr>\n
Materijal<\/td>\nLiveni \u010delik (prilago\u0111ena vrsta prema crte\u017eu \u2014 ZG35CrMo, ZG42CrMo, ZG310-570 ili ekvivalent)<\/td>\n<\/tr>\n
Tvrdo\u0107a<\/td>\nMeka povr\u0161ina zuba (QT do odre\u0111enog HB raspona)<\/td>\n<\/tr>\n
Toplotna obrada<\/td>\nKaljenje i otpu\u0161tanje (kaljenje do kraja); dostupne su opcije povr\u0161inske tvrdo\u0107e<\/td>\n<\/tr>\n
Proizvodnja zup\u010danika<\/td>\nZup\u010dano glodanje (bez bru\u0161enja - zavr\u0161na obrada nakon glodanja)<\/td>\n<\/tr>\n
Ugao pritiska<\/td>\n20\u00b0 (standardno); dostupni su prilago\u0111eni uglovi<\/td>\n<\/tr>\n
Spiralni ugao<\/td>\nIzra\u0111eno po narud\u017ebi (specificirano prema crte\u017eu)<\/td>\n<\/tr>\n
Stepen ta\u010dnosti zup\u010danika<\/td>\nRazred 8\u20139 (ISO 1328)<\/td>\n<\/tr>\n
Podru\u010dje primjene<\/td>\nKugli\u010dni mlinovi, mlinovi za cement, mlinovi za preradu rude, brodski pogon, vitla za priobalne objekte, veliki industrijski mjenja\u010di<\/td>\n<\/tr>\n
Minimalna koli\u010dina narud\u017ebe (MOQ)<\/td>\n1 set (potpuno prilago\u0111eno po narud\u017ebi)<\/td>\n<\/tr>\n
Vrijeme isporuke<\/td>\n15\u201320 radnih dana za masovnu proizvodnju; izrada pojedina\u010dnog komada po narud\u017ebi po dogovoru<\/td>\n<\/tr>\n
Uslovi pla\u0107anja<\/td>\nPrihvataju se EXW, FOB, CIF; T\/T i L\/C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Uobi\u010dajeni ekvivalenti legure lijevanog \u010delika<\/p>\n

\n\n\n\n\n\n\n\n
VB (Kina)<\/th>\nISO<\/th>\nASTM<\/th>\nJIS<\/th>\nDIN<\/th>\n<\/tr>\n
42CrMo<\/td>\n42CrMo4<\/td>\n4140<\/td>\nSCM440<\/td>\n42CrMo4<\/td>\n<\/tr>\n
40CrNiMoA<\/td>\n\u2014<\/td>\n4340<\/td>\nSNCM439<\/td>\n40NiCrMo6<\/td>\n<\/tr>\n
20CrNiMo<\/td>\n20CrNiMo2<\/td>\n8720<\/td>\nSNCM220<\/td>\n21NiCrMo2<\/td>\n<\/tr>\n
20CrNi2Mo<\/td>\n20NiCrMo7<\/td>\n4320<\/td>\nSNCM420<\/td>\n\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Za\u0161to lijevati \u010delik za vrlo velike dvostruke spiralne zup\u010danike<\/h2>\n

\"Proizvodnja<\/p>\n

Prag iznad kojeg lijevani \u010delik postaje prakti\u010dniji od kovanog \u010delika za blanke zup\u010danika je pribli\u017eno 2-5 tona gotove te\u017eine, ovisno o geometriji tijela zup\u010danika. Ispod ovog praga, kovanje daje vrhunsko poravnanje zrna i otpornost na zamor te je po\u017eeljno za sve visokocikli\u010dne, sigurnosno kriti\u010dne primjene (\u017eeljeznica, zrakoplovstvo, pomorska industrija). Iznad ovog praga, kapacitet kovanja, rukovanje i ekonomi\u010dnost idu u prilog lijevanju - posebno za dvostruke spiralne zup\u010danike, gdje geometrija zuba u obliku riblje kosti dodaje slo\u017eenost ve\u0107 velikom blanku.<\/p>\n

Prednosti lijevanog \u010delika za proizvodnju zup\u010danika velikih razmjera<\/h3>\n