Magnetic suspension type device and method for eliminating bending deformation of cylindrical core mold with large length-diameter ratio

The invention discloses a magnetic suspension type device and method for eliminating bending deformation of a cylindrical core mold with a large length-diameter ratio, and belongs to the technical field of core mold manufacturing. According to the device, a mandrel body, an in-mold electromagnet, a tension permanent magnet, a buoyancy permanent magnet and a straightness sensor are included, the in-mold electromagnet is arranged in the mandrel body, and the outer wall of the middle of the mandrel body becomes a magnetic pole. Under the action of attraction force of the tension permanent magnetover the mandrel body and repulsion force of the buoyancy permanent magnet under the mandrel body, and under the guidance of a straightness sensor detection signal, the in-mold electromagnet is assisted to adjust the magnetic field force in real time, bending deformation of the cylindrical core mold with the large length-diameter ratio is corrected in a self-adaptive mode, even if the weight of the core mold is increased