Monitoring die casting process - by recording ultrasonic emissions above predetermined value and comparing graphical pattern with standard graph

摘要

Monitoring the quality of an die cast metal part consists of recording the ultrasonic emissions from the casting mould as it is filled with liq. metal using a sonic microphone, removing the sonic signals which do not exceed a predetermined threshold valve, graphically summing the impulses and comparing the pattern with that of a sound die casting process. USE/ADVANTAGE - Detecting faults in casting. The ultrasonic emission pattern indicates immediately whether the casting is sound (fig.2) or faulty fig.3).