Article ID: 241102
In this study, we evaluate defects generated during press forming using an ultrasonic phased array. The ultrasonic phased array can capture the occurrence of defects better than measurements using a single probe because it can display the measurement results as a two-dimensional image. A phased array probe was attached to a die using the magnetic force of a magnet, and ultrasonic waves were irradiated to the flange of a cylindrical drawing to evaluate the occurrence of flange wrinkles. When ultrasonic waves were irradiated parallel to wrinkle waves, the wrinkles could be recognized even if the irradiation position was changed. When the wrinkles with a height of about 0.5 mm occurred, the wrinkles could be evaluated for a sheet metal with a thickness of 0.5 mm even with a lubricant of 0.2 ml/s and a processing speed of 50 spm. For a sheet metal with a thickness of 1 mm, the wrinkles could be evaluated by reducing the processing speed to 30 spm with the lubricant usage of 0.2 ml/s.
