Finishing system boosts throughput

The copper laminates fitted to the central rotor of each generator are formed from strip typically 30 x 6mm and have to meet precise specifications to ensure reliable long-term performance. After being cut to length, the strips are bent on edge at 90° at both ends, which has a work-hardening effect, requiring annealing at 700°C. Oxidisation caused by the heat-treatment then has to be removed.

In the past, scale on the copper was removed by staff using powered hand-tools and wearing breathing apparatus in an enclosed area. The company has now invested in two Hodge Clemco blast cabinets linked to an automatic feed system designed by Rotary Engineering, which has tripled throughput, improved working conditions and resulted in a better and more consistent finish. As well as blast cabinets and feed conveyor, the system incorporates abrasive hopper, abrasive cleaning and dust collection equipment in a single integrated unit.