Method for Straightening Hot Profiled Sections

Abstract

The invention relates to a method for leveling profiles ( 5 ). When the hot-rolled profiles are cooled off, they deform considerably. Therefore, the profiles are not leveled while they are hot but are first cooled off. The inventive method for the first time allows leveling hot profiles at a profile temperature of >70° C. while maintaining their once leveled profile shape when cooled off. For this purpose, the leveling force during leveling is applied directly to the flange ( 5 b, 5 c ). As a consequence, the original state of stresses in the web ( 5 a ) and in the web roots remains unchanged and disadvantageous internal stresses are avoided.

1 .- 10 . (canceled) 
   
   
       11 . A method, comprising the step of straightening a profiled section having a web and at least one flange by introducing a straightening force directly into the flange by means of a straightening tool at a temperature of the profiled section of >70° C. 
   
   
       12 . The method of  claim 11 , wherein the profiled section is straightened at a temperature of the profiled section of over 100° C. 
   
   
       13 . The method of  claim 11 , wherein the straightening force is exerted via a lateral surface of the straightening tool, with the lateral surface extending at an angle with respect to a surface of the flange on which the straightening tool acts. 
   
   
       14 . The method of  claim 11 , wherein the straightening force is introduced into a narrow side of the flange. 
   
   
       15 . A method of producing a profiled section, comprising the steps of:
 hot-rolling a blank to shape the blank into a profiled section with a flange; and   straightening the profiled section by a straightening tool at a temperature of the profiled section of >70° C., with the straightening tool introducing a straightening force directly into a narrow side of the flange.   
   
   
       16 . The method of  claim 15 , wherein the profiled section is straightened at a temperature pf the profiled section of over 100° C. 
   
   
       17 . The method of  claim 15 , wherein the straightening force is exerted via a lateral surface of the straightening tool, with the lateral surface extending at an angle with respect to a surface of the flange on which the straightening tool acts. 
   
   
       18 . The method of  claim 15 , wherein the straightening force is introduced into a narrow side of the flange. 
   
   
       19 . The method of  claim 15 , wherein the straightening step is executed after the hot-rolling step, without intervention of a further heating step. 
   
   
       20 . An apparatus for straightening a profiled section having a web and at least one flange, said apparatus comprising a straightening tool for introducing a straightening force directly into the flange of the profiled section at a temperature of the profiled-section of >70° C. 
   
   
       21 . The apparatus of  claim 20 , wherein the straightening tool is arranged above the profiled section to be straightened. 
   
   
       22 . The apparatus of  claim 20 , wherein the straightening tool has a lateral surface which is inclined at an angle with respect to a surface of the flange on which the straightening tool acts. 
   
   
       23 . The apparatus of  claim 22 , wherein the angle is of the order of magnitude of an angle of friction between the straightening tool and the surface of the flange on which the straightening tool acts.