Chock Bearing Sleeve

Back-up-roll and Work-roll chock bearing sleeve refurbishment for Hot and Cold Rolling plate mills. Tapered inside diameter of chock bearing sleeve fits over roll journal. Outside diameter of bearing sleeve rides against soft babbitt bearing fitted to the inside diameter of the chock bearing housing. By design the babbitt bearing will wear and needed to be serviced / and or replaced. For the most part the sleeves don't see much wear, but overtime some wear does occur and through servicing some of the sleeve material is ground and polished back true. Eventually the outside diameter dimension become too small and needs to be restored. Traditionally, because of the small amount of wear / material loss the outside diameter of the chock bearing sleeves would get restored via a metalizing thermal spray process, which was limited to 1.5mm in thickness via a mechanical type bond to the sleeve. Plate rolling mills are notoriously hard on rolling mill equipment, and their heavy loading of the rolling mills exceeds the mechanical strength limit of the thermal spray coating. In order to achieve thicker refurbishment depth and increased bond strength of the refurbishment coating, a weld overlay solution was developed by Cunova with the support of Welding Alloys. The weld refurbishment process incorporates the use of a modified WA R3000 welding lathe (Mod to accept and control diameters up to 1.25m), WA's BUF-S 1.2mm (for edges of sleeves), WA's BUF-S 2.4mm (for main body of sleeves), and WAF 325 flux.

Back-up-roll and Work-roll chock bearing sleeve refurbishment for Hot and Cold Rolling plate mills. Tapered inside diameter of chock bearing sleeve fits over roll journal. Outside diameter of bearing sleeve rides against soft babbitt bearing fitted to the inside diameter of the chock bearing housing. By design the babbitt bearing will wear and needed to be serviced / and or replaced. For the most part the sleeves don't see much wear, but overtime some wear does occur and through servicing some of the sleeve material is ground and polished back true. Eventually the outside diameter dimension become too small and needs to be restored. Traditionally, because of the small amount of wear / material loss the outside diameter of the chock bearing sleeves would get restored via a metalizing thermal spray process, which was limited to 1.5mm in thickness via a mechanical type bond to the sleeve. Plate rolling mills are notoriously hard on rolling mill equipment, and their heavy loading of the rolling mills exceeds the mechanical strength limit of the thermal spray coating. In order to achieve thicker refurbishment depth and increased bond strength of the refurbishment coating, a weld overlay solution was developed by Cunova with the support of Welding Alloys. The weld refurbishment process incorporates the use of a modified WA R3000 welding lathe (Mod to accept and control diameters up to 1.25m), WA's BUF-S 1.2mm (for edges of sleeves), WA's BUF-S 2.4mm (for main body of sleeves), and WAF 325 flux.