{"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\/pt\/product\/heavy-machinery-double-helical-gear-cast-steel-soft-tooth-flank-qt-iso-grade-8-9\/","title":{"rendered":"Engrenagem helicoidal dupla para m\u00e1quinas pesadas \u2014 Flanco do dente em a\u00e7o fundido macio, QT, grau ISO 8\u20139"},"content":{"rendered":"
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Engrenagens helicoidais duplas para m\u00e1quinas pesadas \u2014 Vis\u00e3o geral<\/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 engrenagens helicoidais duplas para m\u00e1quinas pesadas<\/strong> Em a\u00e7os fundidos personalizados, temperados e revenidos para uma condi\u00e7\u00e3o de flanco de dente macio, usinados com precis\u00e3o de grau ISO 8-9, para as aplica\u00e7\u00f5es de acionamento industrial de grande escala mais exigentes.<\/p>\n

\"Engrenagem<\/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 engrenagens helicoidais duplas para m\u00e1quinas pesadas<\/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

Especifica\u00e7\u00f5es t\u00e9cnicas<\/h2>\n

Especifica\u00e7\u00f5es do produto \u2014 Engrenagem helicoidal dupla para m\u00e1quinas pesadas<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Par\u00e2metro<\/th>\nValor<\/th>\n<\/tr>\n
Tipo de engrenagem<\/td>\nEngrenagem helicoidal dupla (engrenagem em espinha de peixe)<\/td>\n<\/tr>\n
Material<\/td>\nA\u00e7o fundido (grau personalizado conforme desenho \u2014 ZG35CrMo, ZG42CrMo, ZG310-570 ou equivalente)<\/td>\n<\/tr>\n
Dureza<\/td>\nSuperf\u00edcie dent\u00e1ria macia (QT para a faixa HB especificada)<\/td>\n<\/tr>\n
Tratamento t\u00e9rmico<\/td>\nT\u00eampera e revenido (endurecimento total); op\u00e7\u00f5es de dureza superficial dispon\u00edveis.<\/td>\n<\/tr>\n
Fabrica\u00e7\u00e3o de engrenagens<\/td>\nFresagem de engrenagens (sem retifica\u00e7\u00e3o \u2014 acabamento como fresado)<\/td>\n<\/tr>\n
\u00c2ngulo de press\u00e3o<\/td>\n20\u00b0 (padr\u00e3o); \u00e2ngulos personalizados dispon\u00edveis<\/td>\n<\/tr>\n
\u00c2ngulo Helicoidal<\/td>\nFeito sob encomenda (especificado por desenho)<\/td>\n<\/tr>\n
Grau de precis\u00e3o da engrenagem<\/td>\nGrau 8\u20139 (ISO 1328)<\/td>\n<\/tr>\n
\u00c2mbito de aplica\u00e7\u00e3o<\/td>\nMoinhos de bolas, moinhos de cimento, moinhos de processamento de min\u00e9rio, propuls\u00e3o naval, guinchos offshore, grandes caixas de engrenagens industriais<\/td>\n<\/tr>\n
MOQ<\/td>\n1 conjunto (totalmente personalizado por encomenda)<\/td>\n<\/tr>\n
Tempo de espera<\/td>\n15 a 20 dias \u00fateis para produ\u00e7\u00e3o em massa; encomendas personalizadas de pe\u00e7as \u00fanicas sob consulta.<\/td>\n<\/tr>\n
Condi\u00e7\u00f5es de pagamento<\/td>\nEXW, FOB, CIF; aceitamos T\/T e L\/C.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Equivalentes de graus de liga de a\u00e7o fundido comuns<\/p>\n

\n\n\n\n\n\n\n\n
GB (China)<\/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

Por que usar a\u00e7o fundido para engrenagens helicoidais duplas de grandes dimens\u00f5es?<\/h2>\n

\"Fabrica\u00e7\u00e3o<\/p>\n

O limite a partir do qual o a\u00e7o fundido se torna mais pr\u00e1tico do que o a\u00e7o forjado para a produ\u00e7\u00e3o de engrenagens brutas situa-se em aproximadamente 2 a 5 toneladas de peso final, dependendo da geometria do corpo da engrenagem. Abaixo desse limite, a forjagem proporciona um alinhamento de gr\u00e3os superior e maior resist\u00eancia \u00e0 fadiga, sendo preferida para todas as aplica\u00e7\u00f5es de alta frequ\u00eancia e cr\u00edticas para a seguran\u00e7a (ferrovi\u00e1rio, aeroespacial, offshore). Acima desse limite, a capacidade da prensa de forjamento, o manuseio e os aspectos econ\u00f4micos favorecem a fundi\u00e7\u00e3o \u2014 particularmente para engrenagens helicoidais duplas, onde a geometria em espinha de peixe dos dentes adiciona complexidade a uma pe\u00e7a bruta j\u00e1 de grandes dimens\u00f5es.<\/p>\n

Vantagens do a\u00e7o fundido para a produ\u00e7\u00e3o de engrenagens em larga escala<\/h3>\n