Method and apparatus for manufacturing panels for vehicles

Abstract

Disclosed herein is a method and apparatus for manufacturing a panel for a vehicle. When a steel sheet is machined to form a panel for a vehicle, a blanking-texturing machine conducts a blanking process for cutting the steel sheet and a texturing process for forming depressions in the steel sheet at the same time. Therefore, the present invention reduces the number of manufacturing processes, thus enhancing the productivity, and reducing the production cost and provides a steel sheet with uniform depressions across the surface of the steel sheet, thereby reducing the coefficient of friction during the pressing process consistently.

1 . A method for manufacturing a panel for a vehicle, comprising:
 blanking-texturing a steel sheet in such a way that when the steel sheet is cut by blanking into a shape corresponding to the panel for the vehicle, a plurality of depressions are simultaneously formed in a surface of the steel sheet; and   pressing the resulting steel sheet having the depressions to form the panel for the vehicle.   
     
     
         2 . The method as set forth in  claim 1 , wherein the depressions are formed in either of both sides of the steel sheet. 
     
     
         3 . The method as set forth in  claim 1 , wherein the depressions are formed in both sides of the steel sheet. 
     
     
         4 . The method as set forth in  claim 1 , wherein each of the depressions has a size ranging from about 50 μm to 200 μm. 
     
     
         5 . The method as set forth in  claim 1 , wherein a density of the depressions with respect to a surface area of one side of the steel sheet ranges from about 1% to 20%. 
     
     
         6 . An apparatus for manufacturing a panel for a vehicle, comprising:
 a blanking-texturing machine configured to cut a steel sheet into a shape corresponding to the panel for the vehicle on a cutting surface, and simultaneously form, by a depression forming portion of the blanking-texturing machine, depressions in a surface of the steel sheet while the steel sheet is being cut; and   a press machining the resulting steel sheet having the depressions to form the panel for the vehicle.   
     
     
         7 . The apparatus as set forth in  claim 6 , wherein the blanking-texturing machine comprises an upper mold and a lower mold,
 wherein the cutting surface is provided on the upper mold, and the depression forming portion is provided on either the upper mold or the lower mold.   
     
     
         8 . The apparatus as set forth in  claim 6 , wherein the blanking-texturing machine comprises an upper mold and a lower mold,
 wherein the cutting surface is provided on the upper mold, and the depression forming portion is provided on each of the upper and lower molds.   
     
     
         9 . The apparatus as set forth in  claim 6 , wherein the depression forming portion has protrusions for forming the depressions, each of the protrusions having a particle size ranging from about 50 μm to 200 μm. 
     
     
         10 . The apparatus as set forth in  claim 6 , wherein the depression forming portion has protrusions for forming the depressions, wherein a density of the protrusions of the depression forming portion with respect to a surface area of one side of the steel sheet ranges from about 1% to 20%. 
     
     
         11 . A steel sheet for manufacturing a panel vehicle comprising: a steel sheet cut to correspond to a particular panel for the vehicle; and
 a plurality of depressions formed on one surface of the steel sheet, wherein each of the depressions is formed to be the same size which ranges from about 50 μm to 200 μm and the plurality of depressions have a density of the depressions with respect to a surface area of one side of the steel sheet ranges from about 1% to 20%, the depressions configured to retain lubricant to reduce the coefficient of friction between the steel sheet and a press.