Method for measuring door sealing gap of vehicle

A method for measuring a door sealing gap comprising the steps of:

• establishing a base coordinate system based on a car line coordinate system by detecting NC holes of a block base on which a vehicle body and a door are placed and generating the base coordinate system;
• converting the base coordinate system into an established coordinate system so that a laser measuring unit can recognize the base coordinate system as the car line coordinate system;
• generating a reference rotational axis by detecting hinge holes that are used for mounting the door onto the vehicle body, displaying the hinge holes in real-time through a controller, and setting a line passing through center points of the hinge holes as the reference rotational axis;
• mounting the door to the vehicle body, and mounting reflectors at predetermined positions at areas around a window opening in the door;
• generating initial reflector position values, in a state where the door is closed, by irradiating laser beams onto the reflectors using the laser measuring unit, then detecting reflected laser beam signals and outputting position information signals to the controller, after which the received signals are used to generate initial reflector position values for performing rotation about the reference rotational axis;
• measuring, in a state where the door is open, positions of the reflectors using the laser measuring unit and outputting corresponding signals to the controller, then scanning specific areas for measuring the sealing gap using a probe;
• displaying surface data of the specific areas scanned in the above step in real-time, and performing CAD data trace-rotation in which the surface data is rotated to the measured initial position centered about the reference rotational axis;
• and
• determining a sealing gap based on the surface data of the specific areas.