Tomohiro Nonaka

Development of Detection Technology of the Scrap-Jumping in Pierce Processing

During the consecutive piercing process of metal sheets, it is very difficult to prevent the scrap-jumping completely. The scrap-jumping causes defects generation. Defective goods will be produced when processing is continued without noticing the scrap-jumping. To solve this problem,we made a die that was able to detect scrap-jumping with the load sensor and transmission-type fiber line-laser sensors for pierce processing and executed the defect detection experiment. As a result of the experiment, the newly developed load sensor was able to detect the defect in the following stamp of the scrap-jumping. On the other hand, the fiber line-laser sensor was able to detect the scrap-jumping directly before the following stamp.

Development of Intelligent Forming Dies with In-Process Defect Detection System for Sheet Products

In press working, to prevent defects in sheet products and establish the traceability of the causes of defects, we have developed defect detection dies incorporating several types of sensor, including load sensors, fiber laser sensors, ultrasonic sensors and optional sensors. Typical defects such as the rising of pierced scraps, burrs, spring-back/spring-go and wrinkling can be detected using the defect detection dies, i.e., the intelligent forming dies. The real-time defect inspection of all products will be possible. This system can be used to identify defective products on the basis of sensor information compiled in a database. The causes of defects can be clarified from the situation in real time.