PWE October 2021

I f a bearing becomes worn, due to misalignment, false brinelling or corrosion, for example, the most common approach is to replace the entire component. However, there is another option using a remanufacturing process to restore the component back to working life. As the name suggests, remanufacturing involves rebuilding a bearing to either meet or exceed the specifications of the original manufactured product. This can use a combination of reused, repaired and new parts. Bearings with more than 30% of their remaining service life can be remanufactured. This can offer a practical and crucially, environmentally sustainable alternative for industrial sectors such as pulp and paper, food and beverage, mining and marine. The key is knowing when to opt for remanufacturing and which approach will yield more cost-savings in the long run. How does it work? Firstly, the used bearing must undergo a thorough inspection, which will compare it with the initial specification drawing. At this stage, the bearing will also be disassembled, cleaned and degreased. Following a visual inspection, microscopic inspection, dimensional inspection and testing will occur. This will culminate in a detailed analysis report that will detail recommendations for appropriate refurbishment and remanufacturing processes. In addition, the data gathered during this initial analysis phase of the remanufacturing process can be used to improve future maintenance programmes. Data relating to recurring failures or accelerated wear can be used as part of an on-going preventative maintenance schedule. Next follows reclassification services — encompassing minor repair, demagnetisation, dynamic testing, re-lubrication, reassembly and packaging for the bearing’s return to industry. If, however, further intervention is needed, Process, Controls & Plant Focus on: Seals, Bearings & Lubrication 28 | Plant & Works Engineering www.pwemag.co.uk October 2021 Should remanufactured bearings become the norm? It takes approximately 100 process steps to produce a new bearing, compared to roughly ten for a remanufactured bearing, according to SKF. It’s no surprise, therefore, that there has been an increasing demand for remanufactured bearings in heavy duty industrial applications. Chris Johnson* explores this attractive alternative to bearing replacement.