that the rod piece and the tool are heated the bending tool must be at least 650 u00b0 c in order to prevent the rapid cooling of the rod or wire piece in contact therewith however its temperature is not higher than 856 u00b0 c which is the bending temperature for the rod or wire when the bending tool is at the predetermined temperature and the clamped in piece of rod or wire is at bending temperature in the bending area the wire is put into the bending tool jig and when it is fully in place the two electric circuits are interrupted both parts are then cooled down the curvature shape is imparted to the rod or wire when the red glow disappears the wire or rod is removed from the clamping device and permitted to cool down naturally the rod or wire is placed into an oven which has been preheated to 850 u00b0 c and is tempered for 12 hours after the tempering the rod or wire is removed and is immediately quenched in water of ambient temperature now the rod or wire has the predetermined curvature together with the superelastic properties over its full length and this curvature is preserved as desired the building component can fulfill the predetermined function the radius of curvature can only be so small that the cross section of the almost finished product during bending into the predetermined does not change essentially that is the material must not be subjected to material flow processes in the bent area they would irreparably destroy the material crystal structure with band.