TPT January 2013

Technology News

Descaling 14 tons of steel bars in one hour

Manufacturing

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the most challenging applications, for example, in the automotive industry. Prior to being drawn into steel bars with standard round, square and hexagonal profiles as well as steel bars with special profiles, the rolled steel must be blast cleaned to remove scale and rust from its surface. Günther Dorscheid, plant manager at Saar- Blankstahl, said: “Blast cleaning is highly critical for meeting the specific customer requirements for an absolutely homogeneous surface, for two reasons: on the one hand, residual scale on the steel can damage the drawing die, which causes scratch marks on the drawn steel products. And on the other hand, scale embedded in the drawn steel can damage the tools during the subsequent machining process. For this reason, after the blast cleaning process the surface of the rolled steel must have a degree of cleanliness of SA 2.5 – SA 3.” This was a key requirement for the replacement of the old shot blast machine with a new blast cleaning system in the Burbach plant. In addition, the customer specifications called for a high parts throughput, high equipment availability, ease of maintenance and a highly efficient dust collection system. Rösler Oberflächentechnik GmbH – Germany Fax: +49 95339 24300 Email: b.mueller@rosler.com Website: www.rosler.com

DRAWN steel, also known as bright steel, used in the production of injection parts for diesel engines, must meet strict quality standards. A key stage in the manufacturing of drawn bright steel is the blast cleaning of the raw material prior to the drawing process. Recently, Rösler developed a continuous shot blast system for a leading manufacturer allowing the fully automatic blast cleaning of steel bars with diameters/ cross-sectional dimensions of 24 to 80mm (approximately 1.0 – 3.2"). This system not only produces excellent descaling results but permits processing speeds of up to 60m (197ft) per minute. As a fully owned subsidiary of Saarstahl AG, Saar-Blankstahl GmbH is able to procure all its raw steel requirements from the parent company. This is a key factor for the quality of the Saar-Blankstahl drawn steel products sold all over the world. Other factors for the high quality of these products are the comprehensive know-how and state-of-the-art manufacturing lines for the drawing, peeling/stripping and heat treatment processes. In addition, the company, with plants in Homburg and Burbach, can offer in-house high performance quality control technologies like eddy current and ultra sonic testing. By individually planning and coordinating the manufacturing processes and using special wires and steel bars, Saar-Blankstahl can produce high performance steel products for

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Cleaning steel bars with diameters up to 80mm

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J anuary 2013