At present, zinc sheets for automotive use are mainly produced by two processes: hot-dip galvanized sheets and electro-galvanized sheets.  The main defects are holes, creases, pits, waves, black spots, white rust, zinc scars, slag, rust, edge breakage, scratches, and scuffs.
Some of the above defects are self-inflicted defects and some come from the galvanizing process.  Some coil plate manufacturers are equipped with traditional visual detection equipment at the end of the line, mainly through parameters such as greyscale and binarisation to detect defects such as scratches and large black spots.  This kind of detection is poorly resistant to interference and often fails to detect defects such as small slag, pits, abrasions, and other changes in greyscale values.
Stamping workshop - uncoiling inspection
Stamping and uncoiling inspection system
The visual detection equipment with AI detection replaces the current random detection by personnel, and at the same time enables full detection of the product, improving the quality of the subsequent production during the stamping process and avoiding cost wastage due to raw material problems.  The equipment is equipped with a defective product record function, which enables the recording of batch product defect information and facilitates subsequent quality tracing to suppliers.  The picture below shows the identification and training of defects such as bumps, scratches and black spots by means of a line camera, with an accuracy of 99%.
津ICP备17005157号 津公安备案号12011602000875