Method and device for production of hollow sections

Abstract

The invention relates to a method and device used to produce hollow sections with very high degrees of reduction at very high manufacturing speeds, while at the same time maintaining or improving the quality of the final product. According to the inventive method, it is possible to produce hollow sections having defined cross-sectional forms and dimensions from a starting material in the form of hollow sections having larger diameters. The starting material is shaped to form the desired hollow section by combinations of stretch reductions and drawing through drawing nozzles. The invention also includes a device for carrying out the above-mentioned method.

1 . Method for producing hollow profiled sections having defined cross-sectional forms and dimensions from base material in the form of hollow profiled sections with greater diameters, comprising: forming the base material is into the desired hollow profiled section via combinations of stretch-reduction and drawing through drawing plates.  
     
     
         2 . Method pursuant to  claim 1 , wherein the base material is formed via a combination of stretch-reduction, drawing, and subsequent stretch reduction.  
     
     
         3 . Method pursuant to  claim 2 , wherein an interior of the stretch-reduced hollow profiled section is calibrated in a drawing stage.  
     
     
         4 . Method pursuant to claims  1  wherein the hollow profiled section is stretch-reduced in a milling stage.  
     
     
         5 . Method pursuant to  claim 1  after the forming process, the hollow profiled section is subjected to stress relief by means of heating.  
     
     
         6 . Method pursuant to  claim 5 , wherein the hollow profiled section is cooled following the stress-relief.  
     
     
         7 . Method pursuant to  Claim 6 , wherein the hollow profiled section is post-formed following the temperature treatment.  
     
     
         8 . Method pursuant to  claim 7 , wherein the post-forming is accomplished via stretch-reduction.  
     
     
         9 . Method pursuant to  claim 1 , wherein the finished hollow profiled section is cut into lengths.  
     
     
         10 . Device for producing hollow profiled sections having defined cross-sectional forms and dimensions from base material in the form of hollow profiled sections with greater diameters, comprising at least one roller assembly for performing a stretch-reduction and at least one drawing plate assembly.  
     
     
         11 . Device pursuant to  claim 10 , wherein rollers in each roller assembly are arranged in pairs, each with essentially parallel axes of rotation.  
     
     
         12 . Device pursuant to  claim 11 , wherein the axes of rotation of the roller pairs are arranged alternating at an angle of 90°, one above the other.  
     
     
         13 . Device pursuant to  Claim 10 , further comprising an interior tool inserted into the hollow profiled section at the drawing plate.  
     
     
         14 . Device pursuant to  Claim 10 , further comprising a post-forming stage  1  equipped with a drawing plate the at least one drawing plate assembly arranged between two roller units of the at least one roller assembly for the purpose of executing a the stretch-reduction.  
     
     
         15 . Device pursuant to  Claim 10 , further comprising an annealing furnace arranged to follow the post-forming stage.  
     
     
         16 . Device pursuant to  claim 15 , further comprising a cooling stage Positioned behind the annealing furnace.  
     
     
         17 . Device pursuant to  Claim 16 , further comprising a roller assembly is positioned to follow temperature processing station in the form of the annealing furnace and/or the cooling stage.  
     
     
         18 . Device pursuant to Claims  10 , further comprising a cutter with a discharge unit.