US2021023601A1PendingUtilityA1

Method of designing press-formed product, press-forming die, press-formed product, and method of producing press-formed product

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Assignee: JFE STEEL CORPPriority: Mar 28, 2018Filed: Feb 25, 2019Published: Jan 28, 2021
Est. expiryMar 28, 2038(~11.7 yrs left)· nominal 20-yr term from priority
Inventors:Yuta KariyazakiYuji Yamasaki
B21D 24/00B21D 22/26B21D 53/88B21D 22/20B21D 22/02B21D 17/02B21D 22/04
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Claims

Abstract

There is a need to suppress falling or rising of an end of a press-formed product and twisting of the press-formed product due to springback to suppress a shape defect of the press-formed product due to the springback and, in designing a shape of a press-formed product produced by press-forming a sheet material, a curvature radius (R1) of a concave curved portion and a curvature radius (R2) of a convex curved portion of a concave and convex curved shape of an additional shape arranged on the press-formed product where the concave curved portion and the convex curved portion are continuous are set to be the same.

Claims

exact text as granted — not AI-modified
1 - 8 . (canceled) 
     
     
         9 . A method of designing a press-formed product, wherein
 in designing a shape of a press-formed product produced by press-forming a sheet material,   an additional shape having a concave and convex curved shape where a concave curved portion and a convex curved portion are continuous is arranged on the press-formed product, and   a curvature radius of the concave curved portion and a curvature radius of the convex curved portion of the concave and convex curved shape are set to be the same.   
     
     
         10 . The method according to  claim 9 , wherein the additional shape is added to improve rigidity of the press-formed product. 
     
     
         11 . A press-forming die for producing a press-formed product provided with an additional shape having a concave and convex curved shape where a concave curved portion and a convex curved portion are continuous from a sheet material, wherein
 the press-forming die is provided with a die member including shoulder portions that each form the concave curved portion and the convex curved portion of the concave and convex curved shape of the additional shape arranged on the press-formed product, and   curvature radii of the shoulder portions of the die member are the same.   
     
     
         12 . The press-forming die according to  claim 11 , wherein the additional shape is added to improve rigidity of the press-formed product. 
     
     
         13 . A press-formed product produced by press-forming a sheet material and provided with an additional shape having a concave and convex curved shape where a concave curved portion and a convex curved portion are continuous, wherein
 a curvature radius of the concave curved portion and a curvature radius of the convex curved portion of the concave and convex curved shape are the same.   
     
     
         14 . The press-formed product according to  claim 13 , wherein the additional shape is added to improve rigidity of the press-formed product. 
     
     
         15 . A method for producing a press-formed product, wherein,
 in producing a press-formed product provided with an additional shape having a concave and convex curved shape where a concave curved portion and a convex curved portion are continuous by press-forming a sheet material,   a curvature radius of the concave curved portion and a curvature radius of the convex curved portion of the concave and convex curved shape are set to be the same.   
     
     
         16 . The method according to  claim 15 , wherein the additional shape is added to improve rigidity of the press-formed product.

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