Stamped component with improved formability

Abstract

A method of shaping a component having a stamped component contour includes forming a first stage of the component contour in a work-piece blank, such that the first stage of the contour is bordered by an outer region of material of the work-piece blank. The method additionally includes forming a stake bead in the outer region of material following the forming of the first stage of the contour, wherein the stake bead has an asymmetrical shape when viewed in a cross-sectional plane. The method furthermore includes forming a second stage of the component contour in the work-piece blank, wherein the stake bead's asymmetrical shape is configured to limit flow of work-piece blank material into the second stage of the contour from the outer region of material to thereby limit an amount of springback and a resultant twist and/or curl of the stamped component contour.

What is claimed is: 
     
         1 . A method of stamping a component having a stamped component contour, the method comprising:
 providing a work-piece blank from a formable material;   forming a first stage of the component contour in the work-piece blank, such that the first stage of the component contour is bordered by an outer region of material of the work-piece blank;   forming a stake bead in the outer region of material following the forming of the first stage of the component contour, wherein the stake bead has an asymmetrical shape when viewed in a cross-sectional plane; and   forming a second stage of the component contour in the work-piece blank, wherein the asymmetrical shape of the stake bead is configured to limit flow of work-piece blank material into the second stage of the component contour from the outer region of material to thereby limit an amount of springback and a resultant at least one of twist and curl of the stamped component contour.   
     
     
         2 . The method of stamping the component of  claim 1 , wherein the stamped component contour includes a wall arranged along a first axis, wherein the forming of the second stage of the component contour includes stretching the work-piece blank along the first axis and thereby forming the wall, and wherein the outer region of material is arranged in a plane transverse to the first axis. 
     
     
         3 . The method of stamping the component of  claim 2 , wherein the asymmetrical shape of the stake bead facilitates the stretching of the work-piece blank to thereby form the wall along the first axis without localized compression in the second stage of the component contour, and wherein at least a part of the stretching of the work-piece blank to form the wall extends into and stops in the stake bead. 
     
     
         4 . The method of stamping the component of  claim 2 , wherein, when viewed in the cross-sectional plane, the forming of the asymmetrical shape of the stake bead includes:
 forming a first radius and a fourth radius in transitions between the outer region of the material and the bead and a peak of the bead defined by a second radius and a third radius;   wherein the second radius is arranged between the first radius and the third radius, and the third radius is arranged between the second radius and the fourth radius; and   forming the first radius such that the formed first radius is at least two times greater than the formed fourth radius.   
     
     
         5 . The method of stamping the component of  claim 4 , further comprising:
 arranging the fourth radius between the first radius and the wall of the component contour; and   arranging the third radius between the wall of the component contour and the second radius.   
     
     
         6 . The method of stamping the component of  claim 4 , further comprising:
 arranging the first radius between the fourth radius and the wall of the component contour; and   arranging the second radius between the wall of the component contour and the third radius.   
     
     
         7 . The method of stamping the component of  claim 4 , wherein, when viewed in the cross-sectional plane, the forming of the stake bead in the outer region of material includes forming a flat section between the second radius and the third radius. 
     
     
         8 . A method of shaping an advanced high-strength steel (AHSS) structural component having a stamped structural component contour for a motor vehicle body structure, the method comprising:
 providing a work-piece blank from a formable material;   forming a first stage of the structural component contour in the work-piece blank, such that the first stage of the structural component contour is bordered by an outer region of material of the work-piece blank;   forming a stake bead in the outer region of material following the forming of the first stage of the structural component contour, wherein the stake bead has an asymmetrical shape when viewed in a cross-sectional plane; and   forming a second stage of the structural component contour in the work-piece blank, wherein the asymmetrical shape of the stake bead is configured to limit flow of the work-piece blank material into the second stage of the structural component contour from the outer region of material to thereby limit an amount of springback and a resultant at least one of twist and curl of the stamped structural component contour.   
     
     
         9 . The method of shaping the AHSS structural component of  claim 8 , wherein the stamped structural component contour includes a wall arranged along a first axis, wherein the forming of the second stage of the structural component contour includes stretching the work-piece blank along the first axis and thereby forming the wall, and wherein the outer region of material is arranged in a plane transverse to the first axis. 
     
     
         10 . The method of shaping the AHSS structural component of  claim 9 , wherein the asymmetrical shape of the stake bead facilitates the stretching of the work-piece blank to thereby the wall along the first axis without localized compression in the second stage of the structural component contour, and wherein at least a part of the stretching of the work-piece blank to form the wall extends into and stops in the stake bead. 
     
     
         11 . The method of shaping the AHSS structural component of  claim 9 , wherein, when viewed in the cross-sectional plane, the forming of the asymmetrical shape of the stake bead includes:
 forming a first radius and a fourth radius in transitions between the outer region of the material and the bead and a peak of the bead defined by a second radius and a third radius;   wherein the second radius is arranged between the first radius and the third radius, and the third radius is arranged between the second radius and the fourth radius; and   forming the first radius such that the formed first radius is at least two times greater than the formed fourth radius.   
     
     
         12 . The method of shaping the AHSS structural component of  claim 11 , further comprising:
 arranging the fourth radius between the first radius and the wall of the component contour; and   arranging the third radius between the wall of the component contour and the second radius.   
     
     
         13 . The method of shaping the AHSS structural component of  claim 11 , further comprising:
 arranging the first radius between the fourth radius and the wall of the component contour; and   arranging the second radius between the wall of the component contour and the third radius.   
     
     
         14 . A stamping tooling for forming a component having a component contour from a work-piece blank (from a formable material), wherein the stamping tooling is configured to:
 form a first stage of the component contour in the work-piece blank, such that the first stage of the component contour is bordered by an outer region of material of the work-piece blank; and   form a second stage of the component contour in the work-piece blank following the forming of the first stage of the component contour;   the stamping tooling comprising:
 a stake bead profile configured to form in the outer region of material, after completion of the first stage of the component contour and during forming of the second stage of the component contour, a stake bead having an asymmetrical shape when viewed in a cross-sectional plane, such that the asymmetrical shape of the stake bead is configured to limit flow of work-piece blank material into the second stage of the component contour from the outer region of material to thereby limit an amount of springback and a resultant at least one of twist and curl of the stamped component contour. 
   
     
     
         15 . The stamping tooling of  claim 14 , wherein the stamped component contour includes a wall arranged along a first axis, wherein the stamping tooling forms the second stage of the component contour by at least in part stretching the work-piece blank along the first axis and thereby forms the wall, and maintains the outer region of material arranged in a plane transverse to the first axis. 
     
     
         16 . The stamping tooling of  claim 15 , wherein the stake bead profile forms the asymmetrical shape of the stake bead to stretch the work-piece blank and thereby form the wall along the first axis without localized compression in the second stage of the component contour, and wherein the stake bead profile forms the asymmetrical shape of the stake bead such that at least a part of the stretching of the work-piece blank to form the wall extends into and stops in the stake bead. 
     
     
         17 . The stamping tooling of  claim 15 , wherein, when viewed in the cross-sectional plane, the stake bead profile further forms the asymmetrical shape of the stake bead by:
 forming a first radius and a fourth radius in transitions between the outer region of the material and the bead and a peak of the bead defined by a second radius and a third radius;   wherein the second radius is arranged between the first radius and the third radius, and the third radius is arranged between the second radius and the fourth radius; and   forming the first radius such that the formed first radius is at least two times greater than the formed fourth radius.   
     
     
         18 . The stamping tooling of  claim 17 , wherein the stake bead profile further forms the asymmetrical shape of the stake bead stake by:
 arranging the fourth radius between the first radius and the wall of the component contour; and   arranging the third radius between the wall of the component contour and the second radius.   
     
     
         19 . The stamping tooling of  claim 17 , wherein the stake bead profile further forms the asymmetrical shape of the stake bead stake by:
 arranging the first radius between the fourth radius and the wall of the component contour; and   arranging the second radius between the wall of the component contour and the third radius.   
     
     
         20 . The stamping tooling of  claim 17 , wherein, when viewed in the cross-sectional plane, the stake bead profile further forms the asymmetrical shape of the stake bead by forming a flat section between the second radius and the third radius.