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Entstehung und Ermittlung von Eigenspannungen erster Art in Biege- und Tiefziehteilen

CIRP Annals - Manufacturing Technology
Publication Date
DOI: 10.1016/s0007-8506(07)61918-0


Residual stresses, which can affect its performance in later service, are contained in every workpiece. Most forming processes like bending or deep-drawing leave high residual stresses, which are caused by different forming grades throughout the cross-sections. For practice especially the residual stresses of the 1 kind, which can be considered through mm-ranges as homogeneous, are of interest. The origin and determination of these residual stresses are examined in cold-formed sheet metals, especially in those manufactured by bending and deep-drawing. This is done by numerical and experimental methods. The sheet metal forming process “bending” was calculated by using the the Finite-Elements-System MESA (Modular Extendable Structures Analyzer). In consequence of unburdening the workpiece answers with spring back and residual stresses. These numerical solutions were completed by experimental tests. So a new procedure to evaluate a special hole drilling method, the airbrasive method, was developed. During the hole drilling procedure the strain-measurement is supported. The strains are stored and evaluated automatically by the new computer-aided-procedure. The stresses as a function of the hole depth, which is equivalent to the thickness of the metal sheet, are resulting. This new method was practiced at some bended and deep-drawn specimen. The results agreed well to the numerical solutions.

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