Steel

Mill Stand Roll Housing Bore Reclamation

Worn roll housing bores and liner seats rebuilt cold and shimmed with conforming support to restore the bearing fit, no machining required.

Metal RepairChocking Grouting Alignment
Worn mill stand roll housing bore rebuilt with cold-applied composite

The challenge

A rolling mill stand carries heavy, shock-loaded forces through the roll housing bores and the liner seats that locate the bearings. Over time those surfaces wear and fret, the bores go out of round, and the seats lose their grip. With the fit gone slack, the bearings shift under load instead of sitting fixed, which knocks the roll out of position, accelerates wear, and shows up as off-gauge product and chatter. Left alone, the movement keeps pounding the housing oversize, and the usual fix means line-boring or replacing a heavy casting that is slow to source and hard to pull.

Our approach

We take the worn surfaces back to sound metal and rebuild them in place rather than machine the housing oversize. After we blast the bores and liner seats clean and profiled, we rebuild the lost and fretted metal cold with a 1000 Series composite so the casting sees no heat or distortion. Then we cast conforming support directly against the bearing or liner, releasing it so the support takes the exact shape of the mating part and carries the load across the full contact area. That puts the bearing back in a fixed, fully supported fit so it stops shifting under the rolling forces.

  1. Assess and mapWe measure the bores and liner seats to find where they have gone out of round and where the metal has fretted away, so we know what has to be rebuilt.
  2. Surface preparationWe grit-blast the worn bores and seats back to clean, profiled metal so the rebuild bonds to a sound surface.
  3. Cold metal rebuildWe rebuild the lost and fretted metal with a 1000 Series composite, working cold so the heavy casting takes no welding heat or distortion.
  4. Cast in conforming supportWe release the bearing or liner and cast support directly against it so the rebuilt seat takes the exact shape of the mating part and bears across the full contact area.
  5. Reassemble and return to serviceWe check the restored fit, reassemble the stand, and hand it back so the bearings sit fixed and the roll holds position under load.

The result

  • Worn bores and liner seats rebuilt in place without line-boring or replacing the housing
  • Bearing fit restored so the roll stays fixed and stops shifting under the rolling forces
  • Conforming support cast directly against the mating part to spread the load across the full contact area
  • Stand returned to service by factory-trained and factory-certified Belzona applicators

Belzona systems used

1000 Series

In the field

Roll housing bore and bearing seat rebuilt to a fixed fit
Conforming support cast against a bearing to spread load across the seat
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