[News] SPINNER HANGER SHOT BLAST MACHINE FOR LARGE CAST PARTS

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Highly Economical Desanding and Blast CleaningFor desanding and blast cleaning large and high-quality steel castings, the TechnoGuss Tangerhütte foundry invested in a new continuous spinner hanger shot blast machine. The system has seven high-performance blast wheels and is characterised by its heavy-duty design, high flexibility and optimised classification and cleaning of the blast media.TechnoGuss Tangerhutte GmbH is one of the most modern foundries in Germany and produces various parts with weights ranging from 50 to 10,000 kg that have to meet the highest quality requirements. The foundry manufactures products for ship engines, transmissions, wind power generators, fittings and pumps as well as for general heavy-duty machinery. 70% of the products are spheroidal graphite castings and the rest are grey cast iron.As part of the foundry's modernisation, a new building was equipped with a continuous spinner hanger blasting machine (RHBD 45/50-T) from the blasting systems supplier Rosler for desanding and blast cleaning. The decision was made after talks with various manufacturers.The main criteria were not only the quality of the blasting results but also the efficiency of the system and the possibility to blast the majority of the product range, which includes more than 5,000 different cast parts. “Without a high-performance shot blast system there is no way to manufacture high-value castings in a competitive manner. Rösler did not offer the lowest price but very high performance/productivity in relation to the price, and we always received good technical advice and service,” explained Jamshid Yektai, general manager of TechnoGuss Tangerhutte.Designed for high throughput and extreme loadsThe influential factor in the decision to install a customer-made machine from Rösler was that it is designed for the special requirements in foundry operation. TechnoGuss processes up to 200 tonnes of cast parts per day and each part passes through the system for desanding and then again for surface homogenisation. This throughput can only be achieved with a high blasting intensity. In order to guarantee this the blasting machine has a total of seven high-performance blast wheels (type Hurricane H42) each with a diameter of 420mm and a power of 22kW.Five of the wheels are located in the walls and two on the roof of the steel chamber. The system supplier determined the optimum arrangement of the wheels using 3D simulation of the blasting process. In normal operation all blast wheels are in use at the same time. They can, however, be stitched on and off individually for special blasting jobs.The high blast intensity naturally results in extremely high loads on the surfaces of the blasting chamber that are in contact with the blast media. For that reason the machine housing is made from wear-resistant manganese steel. In addition, critical wear areas are lined with replaceable, wear-resistant X120Mn12 manganese plates. This ensures a long service life for the shot blast machine, thus guaranteeing a secure investment.The most varied parts with weights of between 50 and 10,000 kg are blasted at Technoguss. In blast machines for desanding, a magnetic separator is located upstream of the airwash separator. Blasting process for 5,000 different partsAfter casting, the raw parts are transported to the new shot blast machines. There, the bridge crane collects the part or the batch carrier at a defined position and travels into the blast machine. The maximum batch weight is 20,000kg.The blast machine has a working envelope of 6 x 6 x 5 m. Within the blasting zone there are three fixed crane positions in which the raw cast parts undergo a rotational movement, allowing very different blasting angles to be achieved.

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