Abnormality determination and estimation method for product of plastic working, and an abnormality determination and estimation device

• Main Authors: MURAO, MASUAKI, ONISHI, YASUHIRO
• Format: Patent
• Language: English; French; German
• Published: 01.09.2010
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PHYSICS; PRESSES; PRESSES IN GENERAL; PUNCHING METAL; TESTING; TRANSPORTING; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

The abnormality determination and estimation means (200a) estimates the presence or absence of an abnormality of the product of plastic working with respect to an elastic wave in processing of a non-defective product, based on a first elastic wave A1 that is an elastic wave generated in a processing step immediately before an upper die comes into contact with a lower die after the beginning of plastic working, a second elastic wave A2 that is an elastic wave generated in a processing step when the upper die comes into contact with the lower die, and a third elastic wave A3 that is an elastic wave generated in a processing step after the upper die comes into contact with the lower die. This makes it possible to improve the precision of abnormality detection and discriminate the abnormalities.