Method and device for coating scaled forming products with a lubricant

Abstract

A method and a device allow scaled strand-shaped metal forming products to be coated with a solid lubricant for the purpose of a forming process in a downstream drawing process while preventing the removal of scale layers present on the metal forming product or solid layers which contain scale. At the same time, the prerequisites for substantially improving the stability of the downstream drawing process and the quality of the produced products should be met. In the method, the scaled forming product is coated with a solid lubricant prior to the downstream drawing process and formed with a degree of deformation in excess of 3%. The forming product is then drawn through at least one accumulation chamber in order to mix the scale particles produced from the scale layer as a result of the forming process with the lubricant provided on the forming product after the forming process.

1 . Method for coating of scale-covered, metallic, strand-shaped forming material with a lubricant, for forming during a downstream drawing process, wherein the scale-covered forming material is sheathed with a solid lubricant before the downstream drawing process, and formed at a forming degree ε of >3%, and afterward drawn through at least one accumulation chamber for mixing the scale particles that have formed from the scale layer, as the result of forming, with the lubricant present on the forming material after this forming. 
     
     
         2 . Method according to  claim 1 , wherein for sheathing with the solid lubricant and for forming at a forming degree ε of >3%, the scale-covered forming material is drawn through a lubricant-filled pressure chamber. 
     
     
         3 . Method according to  claim 1 , wherein for mixing of the scale particles that have formed from the scale layer as the result of forming with the lubricant present on the forming material, the forming material is drawn through an accumulation chamber having an inside diameter that runs cylindrically or conically in the draw-through direction. 
     
     
         4 . Method according to  claim 3 , wherein an accumulation chamber having an opening present at the discharge, which determines the thickness of the lubricant/scale particle film on the exiting forming material, is used. 
     
     
         5 . Method according to  claim 3 , wherein an accumulation chamber having a drawing plate present at the discharge, which determines the thickness of the lubricant/scale particle film on the exiting forming material, is used. 
     
     
         6 . Method according to  claim 1 , wherein the pressure that prevails in the accumulation chamber, in the lubricant/scale particle mixture, is regulated. 
     
     
         7 . Apparatus for coating of scale-covered, metallic, strand-shaped forming material with a lubricant, for forming during a downstream drawing process, containing, on a drawing machine, a device for sheathing a scale-covered forming material with a solid lubricant under the effect of pressure, and one or more downstream drawing plates for forming of the sheathed forming material at a forming degree ε of >3%, as well as a downstream accumulation chamber for mixing the scale particles that have formed from the scale layer as the result of forming with the lubricant that is present on the forming material after this forming. 
     
     
         8 . Apparatus according to  claim 7 , wherein the device for sheathing the scale-covered forming material with a solid lubricant and for forming at a forming degree ε of >3% is a lubricant-filled pressure chamber. 
     
     
         9 . Apparatus according to  claim 7 , wherein the accumulation chamber for mixing the scale particles that have formed from the scale layer as the result of forming with the lubricant present on the forming material after forming has an inside diameter that runs cylindrically or conically in the draw-through direction. 
     
     
         10 . Apparatus according to  claim 7 , wherein the inside diameter of the accumulation chamber that runs cylindrically is dimensioned to be >0.02 mm greater than the diameter of the forming material. 
     
     
         11 . Apparatus according to  claim 7 , wherein the accumulation chamber has an opening at its end, which opening determines the thickness of the lubricant/scale particle film desired on the exiting forming material. 
     
     
         12 . Apparatus according to  claim 7 , wherein the accumulation chamber has a drawing plate at its end, which plate determines the thickness of the lubricant/scale particle film desired on the exiting forming material. 
     
     
         13 . Apparatus according to  claim 7 , wherein a device for regulation of the lubricant pressure prevailing in the accumulation chamber is disposed on the accumulation chamber.