Gantry numerical control machining center and control system and machining method of gantry numerical control machining center

The invention discloses a gantry numerical control machining center and a control system and a machining method of the gantry numerical control machining center. The gantry numerical control machiningcenter comprises a worktable device. The worktable device comprises multiple sets of automatic positioning moving worktable mechanisms which are arranged in the X direction. The gantry numerical control machining center has the beneficial effects that automatic moving positioning of worktables and suckers can be achieved. The control system comprises a CNC controller, a servo control unit in parallel connection with a bus in a bidirectional control manner, a machine head control unit, a worktable control unit and a vacuum control unit. The worktable control unit comprises multiple sets of automatic positioning moving worktable control units and X-direction positioning control units. Each set of automatic positioning moving worktable control unit comprises a set of worktable X-axis feedingservo system, multiple se