Patent ID: 7054789
Filing Date: 2006-05-30
Classification: B21D,G01N

Abstract:
1. An abnormality determination and estimation method for a product of plastic working, comprising: providing an AE sensor in a processing apparatus of the product of the plastic working, for detecting an elastic wave in the processing apparatus; and performing an abnormality determination and estimation for discriminating at least two or more abnormalities of the product of plastic working and estimating a presence or an absence of the abnormality for each processing step of the processing apparatus based on the elastic wave that is generated in the processing step of the plastic working detected by the AE sensor; wherein performing the abnormality determination and estimation step estimates the presence or absence of the 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 that is an elastic wave generated in a processing step immediately before an upper die comes into contact with a lower die after start of plastic working, a second elastic wave 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 that is an elastic wave generated in a processing step after the upper die comes into contact with the lower die.