{"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\/da\/product\/heavy-machinery-double-helical-gear-cast-steel-soft-tooth-flank-qt-iso-grade-8-9\/","title":{"rendered":"Dobbeltspiralgear til tunge maskiner \u2014 St\u00f8bt st\u00e5lflanke med bl\u00f8d tand, QT, ISO-kvalitet 8\u20139"},"content":{"rendered":"
\n

Dobbeltspiralgear til tunge maskiner \u2014 Oversigt<\/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 dobbeltspiralformede gear til tunge maskiner<\/strong> i specialst\u00f8bte st\u00e5lkvaliteter, h\u00e6rdet og anl\u00f8bet til en bl\u00f8d tandflanketilstand, fr\u00e6set til ISO-klasse 8-9 n\u00f8jagtighed, til de mest kr\u00e6vende store industrielle drevapplikationer.<\/p>\n

\"Dobbelt<\/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 dobbeltspiralformede gear til tunge maskiner<\/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

Tekniske specifikationer<\/h2>\n

Produktspecifikationer \u2014 Dobbeltspiralgear til tunge maskiner<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nV\u00e6rdi<\/th>\n<\/tr>\n
Geartype<\/td>\nDobbelt spiralformet gear (sildebensgear)<\/td>\n<\/tr>\n
Materiale<\/td>\nSt\u00f8bt st\u00e5l (specialfremstillet kvalitet if\u00f8lge tegning \u2014 ZG35CrMo, ZG42CrMo, ZG310-570 eller tilsvarende)<\/td>\n<\/tr>\n
H\u00e5rdhed<\/td>\nBl\u00f8d tandoverflade (QT til specificeret HB-omr\u00e5de)<\/td>\n<\/tr>\n
Varmebehandling<\/td>\nH\u00e6rdning og anl\u00f8bning (gennemh\u00e6rdet); overfladeh\u00e5rdhedsmuligheder tilg\u00e6ngelige<\/td>\n<\/tr>\n
Gearproduktion<\/td>\nTandhjulsfr\u00e6sning (ingen slibning \u2014 som fr\u00e6set finish)<\/td>\n<\/tr>\n
Trykvinkel<\/td>\n20\u00b0 (standard); brugerdefinerede vinkler tilg\u00e6ngelige<\/td>\n<\/tr>\n
Spiralvinkel<\/td>\nSpecialfremstillet (specificeret pr. tegning)<\/td>\n<\/tr>\n
Gearpr\u00e6cisionsgrad<\/td>\nKlasse 8\u20139 (ISO 1328)<\/td>\n<\/tr>\n
Anvendelsesomr\u00e5de<\/td>\nKuglem\u00f8ller, cementm\u00f8ller, malmforarbejdningsm\u00f8ller, skibsfremdrift, offshore-spil, store industrielle gearkasser<\/td>\n<\/tr>\n
MOQ<\/td>\n1 s\u00e6t (fuldt specialfremstillet pr. ordre)<\/td>\n<\/tr>\n
Leveringstid<\/td>\n15-20 arbejdsdage for masseproduktion; enkeltstykker efter forhandling<\/td>\n<\/tr>\n
Betalingsbetingelser<\/td>\nEXW, FOB, CIF; T\/T og L\/C accepteres<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Almindelige \u00e6kvivalenter i st\u00f8bt st\u00e5llegering<\/p>\n

\n\n\n\n\n\n\n\n
Storbritannien (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

Hvorfor st\u00f8best\u00e5l til meget store dobbeltspiralformede gear<\/h2>\n

\"Fremstilling<\/p>\n

T\u00e6rsklen, over hvilken st\u00f8bt st\u00e5l bliver mere praktisk end smedet st\u00e5l til tandhjulsemner, er cirka 2-5 tons f\u00e6rdigv\u00e6gt, afh\u00e6ngigt af gearhusets geometri. Under denne t\u00e6rskel giver smedning overlegen kornjustering og udmattelsesmodstand og foretr\u00e6kkes til alle h\u00f8jcyklus-, sikkerhedskritiske applikationer (jernbane, luftfart, offshore). Over denne t\u00e6rskel favoriserer smedepressens kapacitet, h\u00e5ndtering og \u00f8konomi st\u00f8bning - is\u00e6r til dobbeltspiralformede tandhjul, hvor sildebensgeometrien tilf\u00f8jer kompleksitet til et allerede stort emne.<\/p>\n

Fordele ved st\u00f8bt st\u00e5l til storskalaproduktion af gear<\/h3>\n