The Assel mill reduces and finishes the originally rolled mother tube.
The finished seamless pipes are used for the races of antifriction bearings
or even for other engineering applications. A tall, gigantic, rugged
gearbox, having single input and three output with several idlers, drives
this mill. The Assel mill gearbox is 5.1 metres long and 2.7 metres
tall, weighing around 23 tons and capable of absorbing strong vibrations
and shocks imparted by the tube rolling mill. The open aperture provided
in the gearbox allows backward movement of hot working stock.
Technical specifications
- Input power : 850 kW @ 0-600-1100 rpm D.C.motor
- Reduction ratio : 3.976 : 1
- Axial thrust : 1,17,000 N on each output shaft
The gears are made from high tensile carburizing alloy
steel, 17 CrNiMo6 as per DIN 17210, case hardened to 60±2HRc
and finely ground to accuracy Class 6 as per the DIN standard to give
smooth and trouble free operation. Output shafts are made from medium
carbon steel CK 60N as per DIN 17200 of adequate size to withstand heavy
load transmission for better rigidity without undue deflection. Gears
are integral with shaft/key fitted toshaft and are supported in antifriction
spherical roller bearings of adequate size to give higher working life
and to correct misalignment. Output shafts are also provided with spherical
thrust bearings to tolerate axial thrust load in both the directions.
Gears and bearings are housed in accurately machined and highly rigid/robust
MS fabricated housing to give better performance against severe jerks
and vibrations.
Separate motor driven lubricating system is provided to enhance cooling
and lubrication of bearings and gear meshings.
Separate motor driven lubricating system is provided to enhance cooling
and lubrication of bearings and gear meshings.
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