Detecting adhesion of scrap

Issue

Scraps are adhered during the punching process of motor cores

• Existing adhension of scrap sensors alone are unable to detect them, causing defective products to flow out.
• To prevent the outflow of defective products, we are using 100% inspection, which is costly.

Solution

A piezoelectric load sensor "PiezoBolt" was installed behind the punch for measurement.

As a result, it was found that the load trend applied to the PiezoBolt differs greatly between normal operation and when adhension of scraps occur. By setting the forming load data to a threshold value, we have established a system that sends out a warning/stop signal when the data deviates from the threshold value. This prevents the outflow of defective products.

Result

Detects defective products due to adhension of scrap

• It was able to detect anomalies that could not be detected by the adhension of scrap sensor alone.
• Preventing the outflow of defective products has led to cost reductions by eliminating the need for full inspections.