System and method for automatic vehicle body sanding

An automatic vehicle body sanding system operated in a painting factory, the automatic vehicle body sanding system comprising:

• a painting inspection device including a camera disposed on a vehicle body and configured to capture a two-dimensional (2D) image of the vehicle body for which an intermediate process has been completed taken and to process the 2D image based on a painting inspection algorithm to identify a defective position (NG Point), and display the NG Point on a three-dimensional (3D) vehicle body drawing;
• a robot having a multi-joint structure on which at least one of a 3D scanner, a sanding tool, or a dust absorber for sanding work is mounted;
• a server configured to match the defective position of the vehicle body detected by the painting inspection device and 3D scan data of the vehicle body scanned by the 3D scanner with a 3D vehicle body drawing shape on a simulator, and control the sanding work of the robot by creating a 3D robot path so that a sandpaper of the sanding tool contacts with a surface of the defective position horizontally;
• and
• a sandpaper replacement device including a sandpaper recovery machine and a sandpaper supply machine,
• wherein the sandpaper recovery machine includes:
• a cylinder on which the aged sandpaper is seated;
• a limit switch configured to check the seating of the sandpaper;
• a vision sensor configured to check a home position state of the sanding tool;
• a gripper configured to grip the seated sandpaper from both sides;
• and
• a recovery box configured to collect the sandpaper released from the grip by the gripper and freely falling after the sandpaper gripped by the gripper is removed from the sanding tool by retraction of the cylinder.