{"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\/fr\/product\/heavy-machinery-double-helical-gear-cast-steel-soft-tooth-flank-qt-iso-grade-8-9\/","title":{"rendered":"Engrenage \u00e0 double h\u00e9lice pour machines lourdes \u2014 Flanc de dent en acier moul\u00e9 \u00e0 denture douce, QT, classe ISO 8\u20139"},"content":{"rendered":"
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Engrenages \u00e0 double h\u00e9lice pour machines lourdes \u2014 Aper\u00e7u<\/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 engrenages \u00e0 double h\u00e9lice pour machines lourdes<\/strong> en aciers moul\u00e9s sur mesure, tremp\u00e9s et revenus pour obtenir un flanc de dent doux, taill\u00e9s avec une pr\u00e9cision de grade ISO 8-9, pour les applications d'entra\u00eenement industrielles \u00e0 grande \u00e9chelle les plus exigeantes.<\/p>\n

\"Engrenage<\/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 engrenages \u00e0 double h\u00e9lice pour machines lourdes<\/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

Sp\u00e9cifications techniques<\/h2>\n

Sp\u00e9cifications du produit \u2014 Engrenage \u00e0 double h\u00e9lice pour machines lourdes<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Param\u00e8tre<\/th>\nValeur<\/th>\n<\/tr>\n
Type d'engrenage<\/td>\nEngrenage \u00e0 double h\u00e9lice (engrenage \u00e0 chevrons)<\/td>\n<\/tr>\n
Mat\u00e9riel<\/td>\nAcier moul\u00e9 (nuance personnalis\u00e9e selon le dessin \u2014 ZG35CrMo, ZG42CrMo, ZG310-570 ou \u00e9quivalent)<\/td>\n<\/tr>\n
Duret\u00e9<\/td>\nSurface dentaire molle (QT \u00e0 la plage HB sp\u00e9cifi\u00e9e)<\/td>\n<\/tr>\n
Traitement thermique<\/td>\nTrempe et revenu (trempe \u00e0 c\u0153ur) ; options de duret\u00e9 de surface disponibles<\/td>\n<\/tr>\n
Fabrication d'engrenages<\/td>\nTaillage d'engrenages (sans rectification \u2014 finition brute de taillage)<\/td>\n<\/tr>\n
Angle de pression<\/td>\n20\u00b0 (standard)\u00a0; angles personnalis\u00e9s disponibles<\/td>\n<\/tr>\n
Angle h\u00e9lico\u00efdal<\/td>\nFabriqu\u00e9 sur mesure (sp\u00e9cifi\u00e9 par dessin)<\/td>\n<\/tr>\n
Niveau de pr\u00e9cision de l'\u00e9quipement<\/td>\nNiveau 8-9 (ISO 1328)<\/td>\n<\/tr>\n
Champ d'application<\/td>\nBroyeurs \u00e0 boulets, broyeurs \u00e0 ciment, broyeurs de traitement de minerais, propulsion navale, treuils offshore, grandes bo\u00eetes de vitesses industrielles<\/td>\n<\/tr>\n
MOQ<\/td>\n1 ensemble (enti\u00e8rement personnalis\u00e9 sur commande)<\/td>\n<\/tr>\n
D\u00e9lai de mise en \u0153uvre<\/td>\n15 \u00e0 20 jours ouvrables pour la production en s\u00e9rie\u00a0; commande \u00e0 l\u2019unit\u00e9 sur demande.<\/td>\n<\/tr>\n
Conditions de paiement<\/td>\nEXW, FOB, CIF\u00a0; virement bancaire et lettre de cr\u00e9dit accept\u00e9s<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\u00c9quivalents courants en aciers moul\u00e9s alli\u00e9s<\/p>\n

\n\n\n\n\n\n\n\n
GB (Chine)<\/th>\nISO<\/th>\nASTM<\/th>\nJIS<\/th>\nVACARME<\/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

Pourquoi utiliser de l'acier coul\u00e9 pour les tr\u00e8s grandes roues dent\u00e9es \u00e0 double h\u00e9lice ?<\/h2>\n

\"Fabrication<\/p>\n

Le seuil \u00e0 partir duquel l'acier moul\u00e9 devient plus avantageux que l'acier forg\u00e9 pour les \u00e9bauches d'engrenages se situe approximativement entre 2 et 5 tonnes de poids fini, selon la g\u00e9om\u00e9trie du corps d'engrenage. En de\u00e7\u00e0 de ce seuil, le forgeage offre un alignement des grains et une r\u00e9sistance \u00e0 la fatigue sup\u00e9rieurs et est privil\u00e9gi\u00e9 pour toutes les applications critiques \u00e0 cycles \u00e9lev\u00e9s (ferroviaire, a\u00e9rospatiale, offshore). Au-del\u00e0 de ce seuil, la capacit\u00e9 des presses \u00e0 forger, la manutention et le co\u00fbt favorisent le moulage, notamment pour les engrenages \u00e0 double denture h\u00e9lico\u00efdale, o\u00f9 la g\u00e9om\u00e9trie en chevrons des dents complexifie une \u00e9bauche d\u00e9j\u00e0 volumineuse.<\/p>\n

Avantages de l'acier moul\u00e9 pour la production d'engrenages \u00e0 grande \u00e9chelle<\/h3>\n