{"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\/et\/product\/heavy-machinery-double-helical-gear-cast-steel-soft-tooth-flank-qt-iso-grade-8-9\/","title":{"rendered":"Rasketehnika topeltsilindriline hammasratas \u2014 valuterasest pehmete hammastega k\u00fclg, QT, ISO klass 8\u20139"},"content":{"rendered":"
\n

Rasketehnika topeltspiraal\u00fclekanne \u2014 \u00fclevaade<\/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 rasketehnika topeltspiraalsed k\u00e4igud<\/strong> eritellimusel valmistatud valuterasest, karastatud ja n\u00fcritud pehmete hammastega k\u00fcljega, freesitud ISO-klassi 8\u20139 t\u00e4psusega, k\u00f5ige n\u00f5udlikumate suuremahuliste t\u00f6\u00f6stuslike ajamirakenduste jaoks.<\/p>\n

\"Topelt<\/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 rasketehnika topeltspiraalsed k\u00e4igud<\/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

Tehnilised andmed<\/h2>\n

Toote spetsifikatsioonid \u2014 rasketehnika topeltsilindr\u00fclekanne<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameeter<\/th>\nV\u00e4\u00e4rtus<\/th>\n<\/tr>\n
K\u00e4igukasti t\u00fc\u00fcp<\/td>\nTopeltspiraalk\u00e4ik (kalasabaga k\u00e4ik)<\/td>\n<\/tr>\n
Materjal<\/td>\nValatud teras (joonise j\u00e4rgi eritellimusel valmistatud klass \u2014 ZG35CrMo, ZG42CrMo, ZG310-570 v\u00f5i samav\u00e4\u00e4rne)<\/td>\n<\/tr>\n
K\u00f5vadus<\/td>\nPehme hambapind (QT kuni m\u00e4\u00e4ratud HB vahemik)<\/td>\n<\/tr>\n
Kuumt\u00f6\u00f6tlus<\/td>\nKarastamine ja noolutamine (l\u00e4bikarastatud); pinna k\u00f5vaduse valikud on saadaval<\/td>\n<\/tr>\n
K\u00e4ikude tootmine<\/td>\nHammasrataste freesimine (lihvimata \u2014 viimistlus nagu freesitud)<\/td>\n<\/tr>\n
R\u00f5hu nurk<\/td>\n20\u00b0 (standardne); saadaval on ka kohandatud nurgad<\/td>\n<\/tr>\n
Spiraalne nurk<\/td>\nEritellimusel valmistatud (joonise j\u00e4rgi t\u00e4psustatud)<\/td>\n<\/tr>\n
K\u00e4igukasti t\u00e4psusaste<\/td>\nKlass 8\u20139 (ISO 1328)<\/td>\n<\/tr>\n
Rakendusulatus<\/td>\nKuulveskid, tsemendiveskid, maagit\u00f6\u00f6tlemisveskid, laevade j\u00f5useadmed, avamere vintsid, suured t\u00f6\u00f6stuslikud k\u00e4igukastid<\/td>\n<\/tr>\n
MOQ<\/td>\n1 komplekt (t\u00e4ielikult tellimuse j\u00e4rgi kohandatud)<\/td>\n<\/tr>\n
Tarneaeg<\/td>\n15\u201320 t\u00f6\u00f6p\u00e4eva masstootmise puhul; \u00fcksiktootmine l\u00e4bir\u00e4\u00e4kimiste teel<\/td>\n<\/tr>\n
Maksetingimused<\/td>\nEXW, FOB, CIF; T\/T ja L\/C aktsepteeritakse<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Tavalised valatud terase sulamiklassi ekvivalendid<\/p>\n

\n\n\n\n\n\n\n\n
Suurbritannia (Hiina)<\/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

Miks valida v\u00e4ga suurte topeltspiraalhammasrataste jaoks valatud teras?<\/h2>\n

\"suurte<\/p>\n

L\u00e4vi, millest alates on valuteras hammasrataste toorikute puhul praktilisem kui sepistatud teras, on umbes 2\u20135 tonni valmiskaalu, olenevalt hammasratta kere geomeetriast. Sellest l\u00e4vest allpool tagab sepistamine parema terasejoonduse ja v\u00e4simuskindluse ning seda eelistatakse k\u00f5igis k\u00f5rge ts\u00fckliga ja ohutuskriitilistes rakendustes (raudtee, lennundus, avamere). Sellest l\u00e4vest k\u00f5rgemal soosivad sepistamispressi v\u00f5imsus, k\u00e4sitsemine ja \u00f6konoomsus valamist \u2013 eriti kahekordsete spiraalhammasrataste puhul, kus kalasabakujulise hammasgeomeetria lisab niigi suurele toorikule keerukust.<\/p>\n

Valatud terase eelised suuremahuliseks hammasrataste tootmiseks<\/h3>\n