Device and method for eliminating bending deformation of ferromagnetic cylindrical core mold with large length-diameter ratio

The invention discloses a device and method for eliminating bending deformation of a ferromagnetic cylindrical core mold with a large length-diameter ratio, and belongs to the technical field of coremold manufacturing. The device comprises a core mold body, rotating shafts are installed at the two ends of the core mold body, the device further comprises a portal frame, arc-shaped permanent magnets, a bending deformation measuring instrument and a control module, wherein the core mold body is rotationally arranged on stand columns on the two sides of the portal frame around the center axis ofthe core mold body, and the arc-shaped permanent magnets are fixed to a cross beam of the portal frame and keep a certain distance from the core mold body, and exhibits attraction to a core mold bodymade of a ferromagnetic material; a height adjusting device is arranged on the stand columns of the portal frame; the bending deformation measuring instrument is used for measuring the bending direction and degree of the core m