The invention relates to a straightening machine (1) for bending straightening, in particular metallic, workpieces (9) and / or components (9), comprising a bending straightening device (10) with at least one bending straightening tool (5, 6), a machine control (14) for controlling / regulating the straightening machine (1) and / or straightening machine components, and a defect detection device (17) for detecting existing in the workpiece / component (9) before bending straightening or arising during bending straightening Material defects. The straightening machine (1) comprises a calibration device (18), the calibration device (18) with the flaw detection device (17) carrying out a calibrating flaw measurement on a sample workpiece / component, while the bending straightening tool (5, 6) is controlled in this way / it is regulated that the sample workpiece / component is subjected to a variable bending calibration force until the sample workpiece / component visibly fails structurally. Based on the calibrating defect measurement, the calibration device (18) generates a calibration data packet comprising calibration parameters and forwards the calibration data packet in terms of data technology to the machine controller (14), so that the bending straightening of other workpieces / components (9) Device (10) taking into account the calibration parameters.
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