Frame component product flexible combination tool and design method

The invention discloses a flexible combination tool for frame component products, and particularly relates to a large frame component tool based on MBD digital marking on the basis of the aircraft manufacturing technology, which comprises a fixed end positioning seat and a movable end positioning seat which are symmetrical, a pair of guide rails is arranged between the two positioning seats, a ball screw is arranged between the guide rails, and a movable end positioning seat is arranged between the movable end positioning seat and the fixed end positioning seat. The movable end positioning seat is fixedly connected with a nut on the ball screw; a positioning plate is fixed on each of the two positioning seats, the two positioning plates are parallel to each other, four tool ball holes are formed in each positioning plate, and a plurality of positioning pin holes are designed in each positioning plate and used for positioning an end frame positioner; and a plurality of stringer positioners are mounted on the o