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The effects of the straightening process on the residual stress condition of large and small sections was determined on three straightening machines. Conventional straightening processes have a particularly negative effect on the quality of the drive-side web root area. Variations of the straightening disk geometry involving different widths, edge radii, diameters and mounting positions of modified straightening disks, do indeed show the influence of the disk parameters but cannot serve to achieve a quality improvement in the form of a more even stress distribution in small sections, While an accurate adaption of the straightening disk to the shape of straightened section, in terms of diameter deviation and surface contour, can lead to an almost complete disappearance of the compression stress hump typically observed on small sections, more pronounced web thickness tolerances will nevertheless prevent an optimum stress distribution.

Larger sections exhibit event distributed low stress levels after cooling. A straightening process based on the new flange support technology (FS straightening method) preserves this favourable stress distribution quality. The new straightening method also prevents the profile height increase and the emergence of stress peaks in web areas adjacent to the flanges, which as a negative impact on product quality, and is therefore suitable for large section roller straightening applications. .

Additional information

Authors: NEUSCHÜTZ E, Verein Deutscher Eisenhüttenleute, Düsseldorf (DE);MAAG E, Verein Deutscher Eisenhüttenleute, Düsseldorf (DE);NEUSCHUTZ E, Verein Deutscher Eisenhuttenleute, Dusseldorf (DE)
Bibliographic Reference: EUR 16041 DE (1997) 75pp., FS, ECU 13.50
Availability: Available from the (2)
ISBN: ISBN 92-828-0108-X
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