Abstract: An apparatus for detecting a defect of a press panel includes: an acoustic emission sensor unit configured to detect at least one elastic wave signal emitted from the press panel as a detection target during press work, a period measurer configured to measure a period as a section in which there are consecutive signals with a greater voltage than a threshold voltage among the at least one detected signals, and a defect existence determination unit configured to determine that a defect is generated in the press panel when the measured period is greater than a first reference value, and to determine that the press panel is in a normal state when the measured period is smaller than a second reference value which is smaller than the first reference value.

Abstract: An apparatus for detecting a defect of a press panel includes: an acoustic emission sensor unit configured to detect at least one elastic wave signal emitted from the press panel as a detection target during press work, a period measurer configured to measure a period as a section in which there are consecutive signals with a greater voltage than a threshold voltage among the at least one detected signals, and a defect existence determination unit configured to determine that a defect is generated in the press panel when the measured period is greater than a first reference value, and to determine that the press panel is in a normal state when the measured period is smaller than a second reference value which is smaller than the first reference value.

Abstract: According to the present invention, it is possible to determine a defect on a product caused in a pressing process by applying a predetermined acoustic signal to an object to be inspected and then sensing propagation of the applied signal, and it is possible to improve inspection performance, using an acoustic sensor capable of sensing sounds in an audible band and a sound collector that collects sounds and prevents noise. Further, it is possible to prevent defective panels from being put into the following process line by inspecting panels produced in a panel production line.

Abstract: According to the present invention, it is possible to determine a defect on a product caused in a press process by applying a predetermined acoustic signal to an object to be inspected and then sensing propagation of the applied signal, and it is possible to improve inspection performance, using an acoustic sensor capable of sensing sounds in an audible band and a high-frequency sensor capable of sensing sounds in an non-audible band.