Rolling Mill Gearbox
A rolling-mill gearbox transmits power from the main motor to the work rolls of a steel, copper or aluminium rolling mill, holding the rolls at a uniform speed under the heavy, fluctuating and impact loads of the bite. The drive train usually pairs a main helical reduction gearbox with a pinion stand (2HI or 3HI) that splits drive to the upper and lower rolls at the required spacing; on some lines a speed-increaser or combined reduction-and-pinion stand is used. Because rolling loads are high and shock-laden, the gear set and bearings are sized to a high service factor and the housing is built rigid to hold tooth contact under deflection.
Main mill reducers run from a few hundred kW into the megawatt range, with ratios typically from about 1:1 (pinion stands, for splitting) up to 20:1 or more in the reduction box, helical efficiency near 97-98%, and one to three stages. Rating follows AGMA 2101/ISO 6336 with AGMA 6010 enclosed-drive practice and ISO 1328 / AGMA 2015 gear quality; a high service factor covers the rolling shock and any reversing-mill reversals.
Gears are case-hardened, ground alloy steel (18CrNiMo7-6) in heavy fabricated housings on large roller bearings, with forced lubrication and oil cooling for the heat load, and flexible couplings to the rolls.
Integration covers motor coupling, the pinion-stand output spacing matched to the roll set, forced lubrication with filtration and cooling, and synthetic PAO ISO VG 220/320 oil, with service factor set to the rolling duty and shock spectrum.
Himalay's MSME partners manufacture rolling-mill gear drives with gear-rating to AGMA/ISO 6336, ISO 9001 quality systems, load and efficiency test reports and traceability; CE (Machinery Directive), ATEX/IECEx for hazardous areas, and SABER (Saudi Arabia) coordinated as part of the standard order flow.
