Method for testing workpieces, e.g. vehicle crankshaft or kingpin of cast steel

摘要

The method involves producing a part from a cast blank and forging it between two tool halves, to leaving a projecting ridge. At least one specimen (4) is removed from a workpiece produced in this way, so that the sample has a processed surface part (2) with a ridge edge (3). The specimen is then subjected to a bend test, which is used to determine the rupturing limit or plastic deformation of the specimen. A further specimen (5) may be removed, which has a surface part without a ridge edge. This specimen is also subjected to a bend test to determine its rupturing limit or plastic deformation. The two specimens have the shape of a circle segment of a determined thickness. The spherical part of the segment represents the processed surface part (2).