A direct resistance heating method for shaped blank

Direct electric resistance heating allows fast and uniform of rectangular blanks in hot forming process. To adapt this technology for any blank shape, a solution is proposed by splitting the part several strips heated generators. By optimizing number, orientation dimensions to reduce added material energy costs, method applied case windscreen upright blank. From 3D thermoelectric model taking into account imperfection contact between electrodes, integrating PID-controller electrical power limitations, demonstrator developed. This has proved be effective shaped quickly uniformly during stamping