Rolling Mill Assembly Part 1: Roll System Assembly

# Rolling Mill Assembly Part 1: Roll System Assembly ## 1.1 Rollers The roller material should be selected based on rolling material characteristics. Nickel-chromium-molybdenum infinitely chilled ductile iron is commonly used. The fillet radius at the roller journal must be machined to Ra1.6 or better. ## 1.2 Bearings Both ends use four-row cylindrical roller bearings. The bearing inner ring is heated to 100°C and mounted on the roller journal. Interference should be 0.06-0.09mm. The fixed end uses bidirectional thrust tapered roller bearings. Axial clearance must be within 0.10-0.15mm. ## 1.3 Bearing Sealing Four-row cylindrical roller bearing sealing uses internal skeleton single-lip oil seals. O-rings and dust seals are made of fluororubber. ## 1.4 Roller Axial Adjustment Only the top roller at the fixed end has axial adjustment. Adjustment range is +/-5mm. ## 1.5 Press-Down Nut and Tie Rod The press-down nut is made of bronze with a spherical end. The four tie rods have right-hand threads on top and left-hand threads on bottom. ## 1.6 Roll Balancing Eight springs pass through tie rods between end cover and balance nut. Balance force is approximately 1.2-1.4 times the weight being balanced.