Method for producing a sheet metal product and sheet metal product

Abstract

A method for producing a sheet metal product ( 1 ) from a sheet metal preliminary product ( 2 ) is proposed, wherein at least one surface ( 7 ) of the sheet metal preliminary product ( 2 ) is coated with a coating, wherein the sheet metal preliminary product ( 2 ) is rolled, wherein depressions ( 6 ) are rolled into the surface ( 7 ) during the rolling operation, wherein after the coating and rolling operations lubricant ( 8.1 ) is introduced into the depressions ( 6 ), wherein after the introduction of lubricant ( 8.1 ) the sheet metal preliminary product ( 2 ) is mechanically formed by a forming tool ( 5 ), characterized in that the surface ( 7 ) is coated in such a way that, in the forming tool ( 5 ) during the forming process, in particular under relative movement between sheet metal surface and tool surface, the coating is elastically deformable under loads of 0.5 MPa to 20 MPa and plastically deformable under loads of above 20 MPa.

1 . A method for producing a sheet metal product ( 1 ) from a sheet metal preliminary product ( 2 ), wherein at least one surface ( 7 ) of the sheet metal preliminary product ( 2 ) is coated with a coating, wherein the sheet metal preliminary product ( 2 ) is rolled, wherein depressions ( 6 ) are rolled into the surface ( 7 ) during the rolling operation, wherein after the coating and rolling operations lubricant ( 8 . 1 ) is introduced into the depressions ( 6 ), wherein after the introduction of lubricant ( 8 . 1 ) the sheet metal preliminary product ( 2 ) is mechanically formed by a forming tool ( 5 ), characterized in that the surface ( 7 ) is coated in such a way that, in the forming tool ( 5 ) during the forming process, the coating is elastically deformable under loads of 0.5 MPa to 20 MPa and plastically deformable under loads of above 20 MPa. 
     
     
         2 . The method as claimed in  claim 1 , wherein the surface ( 7 ) is coated in such a way that, in the forming tool ( 5 ) during the forming process, the coating is elastically deformable under loads of 0.5 MPa to 15 MPa and plastically deformable under loads of above 25 MPa. 
     
     
         3 . The method as claimed in either of the preceding claims, wherein the depressions ( 6 ) are rolled in as closed depressions ( 6 ) with respect to a main plane of extent of the sheet metal preliminary product ( 2 ). 
     
     
         4 . The method as claimed in  claim 3 , wherein the depressions ( 6 ) are rolled in in the shape of an I, rectangle or square with respect to the main plane of extent of the sheet metal preliminary product ( 2 ). 
     
     
         5 . The method as claimed in one of the preceding claims, wherein the depressions ( 6 ) are rolled in with a depth of 2 μm to 15 μm, preferably 2 μm to 10 μm, and particularly preferably 2 μm to 5 μm. 
     
     
         6 . The method as claimed in one of  claims 3  to  5 , wherein the depressions ( 6 ) are rolled with a ratio of depth to volume of the depression ( 6 ) of 1:3 to 1:15, and preferably 1:5 to 1:10. 
     
     
         7 . The method as claimed in one of the preceding claims, wherein depressions ( 6 ) are rolled in on at least 30% of the area of the surface ( 7 ) of the sheet metal preliminary product ( 2 ). 
     
     
         8 . The method as claimed in one of the claims, wherein the depressions ( 6 ) are rolled such that a base ( 6 . 1 ) of the depression ( 6 ) has a smaller area than the projection of the depression ( 6 ) onto the main plane of extent of the surface ( 7 ). 
     
     
         9 . The method as claimed in  claim 8 , wherein the depressions ( 6 ) are rolled in such that walls ( 6 . 2 ) of the depressions ( 6 ) form an angle (α) of 105° to 140°, and preferably 110° to 120°, with the main plane of extent of the surface ( 7 ). 
     
     
         10 . The method as claimed in one of the preceding claims, wherein zinc is used as the coating. 
     
     
         11 . The method as claimed in one of the preceding claims, wherein the sheet metal preliminary product ( 2 ) is coated by hot-dip galvanizing, wherein the sheet metal preliminary product ( 2 ) is coated before the rolling operation. 
     
     
         12 . The method as claimed in one of  claims 1  to  10 , wherein the sheet metal preliminary product ( 2 ) is coated by electrolytic means, wherein the sheet metal preliminary product ( 2 ) is coated after the rolling operation. 
     
     
         13 . A sheet metal product ( 1 ) produced by a method as claimed in one of the preceding claims.