System for assembling body panel

A vehicle body assembly system in which a pre-buck section and a main-buck section are respectively formed along a transport path of a floor assembly, comprising:

• a pre-buck unit disposed in the pre-buck section and configured to regulate a lower portion of a different side assembly for each vehicle model with respect to opposite sides of the floor assembly, regulate a cowl and a front roof rail with respect to an upper portion of the side assembly, and weld the upper portion of the side assembly, the cowl, and the front roof rail;
• wherein the pre-buck unit includes:
• a first gripper detachably provided in a handling robot, coupled to a first side of a first post frame provided in the transport path of the pre-buck section, and configured to regulate the cowl and the upper portion of the side assembly;
• and
• a second gripper detachably provided in the handling robot, coupled with a second side of the first post frame, and configured to regulate a front roof rail and the upper portion of the side assembly,
• wherein the first post frame is coupled to the first and second grippers, the first post frame having first posts provided at opposite sides of the transport path;
• and
• a main-buck unit disposed in the main-buck section, configured to regulate a rear roof rail and a package tray with respect to the upper portion of the side assembly that is pre-assembled in the pre-buck unit, and weld the upper portion of the side assembly, the rear roof rail, and the package tray;
• wherein the main-buck unit includes:
• a third gripper detachably provided in the handling robot, coupled with a first side of a second post frame provided in the transport path of the main-buck section, and configured to regulate the rear roof rail and the upper portion of the side assembly;
• and
• a fourth gripper detachably provided in the handling robot, coupled to a second side of the second post frame, and configured to regulate the package tray and the upper portion of the side assembly,
• wherein the second post frame is coupled to the third and fourth grippers, the second post frame having second posts provided at opposite sides of the transport path.