Abstract: A magnetic device for gripping and clamping a workpiece in a machining unit or on a machining line including a magnetic plate having a distribution of high-energy permanent-magnet modules, which can be electrically activated. An auxiliary workpiece-holder plate made of ferromagnetic material rests on a main surface of the magnetic plate and has a top surface shaped in a way complementary to a surface of the workpiece that rests thereon. The workpiece rests on the top surface of the auxiliary workpiece-holder plate only in points corresponding to some supporting pads, whilst the facing surfaces of the workpiece and auxiliary workpiece-holder plate are kept slightly set apart from one another for most of their extension.

Abstract: A method for monitoring the quality of an industrial working process, which includes identifying defects of the working process, comprises acquiring at least one signal having multiple frequency components from the industrial working process, decomposing the at least one signal having multiple frequency components in signals having single frequency components, calculating the information content for each signal having a single frequency component, analyzing the information content for each signal having a single frequency component, and if the value of the information content of the signal at the lowest single frequency component does not represent a main percentage of the information content of the whole acquired signal, the acquired signal having multiple frequency components is evaluated as indicative of a working process with defects and a defect analysis step is performed on the signal having multiple frequency components.