German machine supplier Heinrich Georg Maschinenfabrik recently put a new high performance straightening machine into operation at EMW Stahl Service Center GmbH in Neunkirchen in Siegerland in North Rhine Westphalia in Germany, which expands the product range with coils made of high strength materials and at the same time achieves a significantly higher throughput. EMW has equipped its existing multi blanking line 2 with a new GEORG high-performance straightening machine. It replaces a straightening machine that could process strip with maximum yield strength of 300 newton per square millimetre. The focus of the project was on significantly increasing the ability to deliver coils made of materials with yield strengths between 600 and 1,000 newton per square millimetre and a thickness between 1.0 and 1.5 mm. EMW's product range includes both hot rolled grades with a pickled or galvanized surface and cold rolled, inorganic or organic coated grades.
The new machine of the type RM 55/17 / 7–6h – 1600 is equipped with a set of straightening rolls in six-high design with 19 straightening rolls, each with a diameter of 50 mm. It is also suitable for strips with high quality surfaces, including electrolytically galvanized sheet metal or grades for the outer skin of automobiles.
The new straightening machine is designed for a material width between 300 and 1,600 mm. In the thickness range between 0.4 and 3.0 mm, it aligns tape with a tensile strength of up to 700 newton per square millimetre, a yield point of up to 450 newton per square millimetre and an elongation at break between 15-45%. In the range between 0.4 and 2.0 mm thick, it processes strip with a maximum tensile strength of 1,200 newton per square millimetre, a yield point of up to 1,000 newton per square millimetre and an elongation at break of 8%. In order to meet the high requirements for high-strength applications, the machine has a particularly stable machine frame and a drive with three output levels on the transfer case.
The first results show that the new machine can process a significantly larger product range than the old one. It also achieves flatness values for all products that are 50% better than DIN EN 10131 requires.