Method for detecting cracks or constriction during sheet metal formation of sheet metal blanks in forming tool of motor vehicle, involves forming sheet metal blank in forming tool, where body sound signal is transferred to forming tool

摘要

The method involves forming a sheet metal blank in a forming tool (1), where a body sound signal (5) is detected and evaluated for detecting a crack formation or a constriction at the sheet metal blank. The body sound signal produced by the crack formation or a constriction is transferred to forming tool, is detected at the forming tool by a body sound sensor (12) and is evaluated in an evaluation unit. The crack formations are detected in steel material or aluminum material. A reference measurement is carried out to obtain data used as reference data for detecting the crack formation. An independent claim is included for a forming tool with a seal.