Press formed component and method for manufacturing same

Abstract

Provided are a press formed component that does not easily cause wrinkling on a vertical wall portion of a curved portion in a component shape having an L-shape, a T-shape, or the like when viewed in a plan view and a method for manufacturing the same. A press formed component includes a top sheet portion, a vertical wall portion continuous to the top sheet portion, and a flange portion and also includes a curved portion in which when viewed in a plan view, at least a part of a boundary portion between the top sheet portion and the vertical wall portion is displaced to the vertical wall portion side and curved concavely toward a longitudinal direction. In a cross-sectional shape of the curved portion, an inclination angle θ [deg] of the vertical wall portion with respect to the top sheet portion satisfies the following expression: (1−sin θ)/cos θ>0.95.

1 . A press formed component comprising a top sheet portion, a vertical wall portion continuous to the top sheet portion, and a flange portion and also comprising a curved portion in which when viewed in a plan view, at least a part of a boundary portion between the top sheet portion and the vertical wall portion is displaced to the vertical wall portion side and curved concavely toward a longitudinal direction,
 wherein, in a cross-sectional shape of the curved portion, an inclination angle θ [deg] of the vertical wall portion with respect to the top sheet portion satisfies expression (1) below:
   (1−sin θ)/cos θ>0.95  (1)
 
   
     
     
         2 . A press formed component comprising a top sheet portion, a vertical wall portion continuous to the top sheet portion, and a flange portion and also comprising a curved portion in which when viewed in a plan view, at least a part of a boundary portion between the top sheet portion and the vertical wall portion is displaced to the vertical wall portion side and curved concavely toward a longitudinal direction,
 wherein when, in a cross-sectional shape, a height of the vertical wall portion is defined as H [mm], an inclination angle of the vertical wall portion with respect to the top sheet portion as θ [deg], a curvature radius at the boundary portion between the top sheet portion and the vertical wall portion as Rp [mm], a curvature radius at a boundary portion between the vertical wall portion and the flange portion as Rd [mm], and a curvature radius of the curved portion in the plan view as r [mm], the inclination angle θ of the vertical wall portion in the curved portion satisfies expression (2) below, and further, the curved portion satisfies expression (3) below or satisfies expressions (4) and (5) below:
   0.85<(1−sin θ)/cos θ≤0.95  (2)
 
   ( r−H ·tan θ)/( r −( H /cos θ))<1.5  (3)
 
   1.5≤( r−H ·tan θ)/( r −( H /cos θ))<5.0  (4)
 
     Rd>Rp   (5)
 
   
     
     
         3 . A press formed component comprising a top sheet portion, a vertical wall portion continuous to the top sheet portion, and a flange portion and also comprising a curved portion in which when viewed in a plan view, at least a part of a boundary portion between the top sheet portion and the vertical wall portion is displaced to the vertical wall portion side and curved concavely toward a longitudinal direction,
 wherein when, in a cross-sectional shape, a height of the vertical wall portion is defined as H [mm], an inclination angle of the vertical wall portion with respect to the top sheet portion as θ [deg], a curvature radius at the boundary portion between the top sheet portion and the vertical wall portion as Rp [mm], a curvature radius at a boundary portion between the vertical wall portion and the flange portion as Rd [mm], and a curvature radius of the curved portion at the boundary portion between the top sheet portion and the vertical wall portion in the plan view as r [mm], the inclination angle θ of the vertical wall portion in the curved portion satisfies expression (6) below, and further, the curved portion satisfies expression (7) below or satisfies expressions (8) and (9) below:
   (1−sin θ)/cos θ≤0.85  (6)
 
   ( r−H ·tan θ)/( r −( H /cos θ))<1.4  (7)
 
   1.4≤( r−H ·tan θ)/( r −( H /cos θ))<2.00  (8)
 
     Rd>Rp   (9)
 
   
     
     
         4 . The press formed component according to  claim 1 , wherein a metal sheet forming the press formed component is a steel sheet having a tensile strength of from 440 MPa to 1800 MPa. 
     
     
         5 . A method for manufacturing a press formed component, wherein in manufacturing the press formed component by press forming into a component shape including a top sheet portion, a vertical wall portion continuous to the top sheet portion, and a flange portion and also including a curved portion in which when viewed in a plan view, at least a part of a boundary portion between the top sheet portion and the vertical wall portion is displaced to the vertical wall portion side and curved concavely toward a longitudinal direction, the curved portion is formed by press forming by bending or drawing in such a manner that an inclination angle θ of the vertical wall portion with respect to the top sheet portion in a cross-sectional shape satisfies expression (10) below:
   (1−sin θ)/cos θ>0.95  (10)
 
 
     
     
         6 . A method for manufacturing a press formed component, wherein, in manufacturing the press formed component by press forming into a component shape including a top sheet portion, a vertical wall portion continuous to the top sheet portion, and a flange portion and also including a curved portion in which when viewed in a plan view, at least a part of a boundary portion between the top sheet portion and the vertical wall portion is displaced to the vertical wall portion side and curved concavely toward a longitudinal direction, when, in a cross-sectional shape, a height of the vertical wall portion is defined as H [mm], an inclination angle of the vertical wall portion with respect to the top sheet portion as θ [deg], a curvature radius at the boundary portion between the top sheet portion and the vertical wall portion as Rp [mm], a curvature radius at a boundary portion between the vertical wall portion and the flange portion as Rd [mm], and a curvature radius of the curved portion at the boundary portion between the top sheet portion and the vertical wall portion in the plan view as r [mm], if forming into a shape in which the inclination angle θ of the vertical wall portion with respect to the top sheet portion in a cross-sectional shape of the curved portion satisfies expression (12) below, the press formed component is manufactured by press forming the curved portion by bending or drawing in such a manner as to satisfy expression (13) below or satisfy expressions (14) and (15) below, or if forming into a shape in which the inclination angle θ of the vertical wall portion with respect to the top sheet portion in the cross-sectional shape of the curved portion satisfies expression (16) below, the press formed component is manufactured by press forming the curved portion by bending or drawing in such a manner as to satisfy expression (17) below or satisfy expressions (18) and (15) below:
   0.85<(1−sin θ)/cos θ≤0.95  (12)
 
   ( r−H ·tan θ)/( r −( H /cos θ))<1.5  (13)
 
   1.5≤( r−H ·tan θ)/( r −( H /cos θ))<5.0  (14)
 
     Rd>Rp   (15)
 
   (1−sin θ)/cos θ≤0.85  (16)
 
   ( r−H ·tan θ)/( r −( H /cos θ))<1.4  (17)
 
   1.4≤( r−H ·tan θ)/( r −( H /cos θ))<2.00  (18)
 
 
     
     
         7 . The method for manufacturing a press formed component according to  claim 5 , wherein a metal sheet used as a material to be press formed is a steel sheet having a tensile strength of from 440 MPa to 1800 MPa. 
     
     
         8 . The press formed component according to  claim 2 , wherein a metal sheet forming the press formed component is a steel sheet having a tensile strength of from 440 MPa to 1800 MPa. 
     
     
         9 . The press formed component according to  claim 3 , wherein a metal sheet forming the press formed component is a steel sheet having a tensile strength of from 440 MPa to 1800 MPa. 
     
     
         10 . The method for manufacturing a press formed component according to  claim 6 , wherein a metal sheet used as a material to be press formed is a steel sheet having a tensile strength of from 440 MPa to 1800 MPa.