Method of producing metallic member

Abstract

A method of producing a metallic member that reduces the burden on a mold during molding is provided. The method of producing the metallic member according to the present invention includes the step of forming a cup-like member by applying a load to a metallic plate member, and the step of forming a plurality of protrusions at an opening end portion of the cup-like member by placing the cup-like member into a mold.

1 . A method of producing a metallic member having a plurality of protrusions, the method comprising:
 forming a cup-like member by applying a load to a metallic plate member, the load applied to the plate member having a component that is perpendicular to a surface of the plate member; and   forming the plurality of protrusions at an opening end portion of the cup-like member with a mold by applying a load to the cup-like member, the load applied to the cup-like member having a component that is perpendicular to a surface of a bottom portion of the cup-like member.   
     
     
         2 . The method of producing the metallic member according to  claim 1 , wherein the cup-like member is formed so that an outside diameter of the opening end portion of the cup-like member is larger than an outside diameter of the bottom portion of the cup-like member. 
     
     
         3 . The method of producing the metallic member according to  claim 1 , further comprising preliminarily molding a groove that is shallower than a groove that is formed between the plurality of protrusions, the step of preliminarily molding the shallower groove being performed between the step of forming the cup-like member and the step of forming the plurality of protrusions. 
     
     
         4 . The method of producing the metallic member according to  claim 3 , further comprising performing heat treatment between the step of preliminarily molding the shallower groove and the step of forming the plurality of protrusions. 
     
     
         5 . The method of producing the metallic member according to  claim 1 , wherein the cup-like member has a hole or a recess at the center of the bottom portion thereof. 
     
     
         6 . The method of producing the metallic member according to  claim 1 , wherein the plate member has a thickness that is less than a width in a radial direction of the protrusions. 
     
     
         7 . The method of producing the metallic member according to  claim 1 , wherein the cup-like member is molded so that a width in a radial direction of the opening end portion of the cup-like member is less than a width in a radial direction of the protrusions. 
     
     
         8 . The method of producing the metallic member according to  claim 1 , wherein the step of forming the cup-like member is performed by any one of drawing, burring, stretch forming, and dishing. 
     
     
         9 . The method of producing the metallic member according to  claim 1 , wherein the step of forming the plurality of protrusions is performed by either forging or cold pressing. 
     
     
         10 . A method of producing a metallic member comprising:
 forming a cup-like member by applying a load to a metallic plate member; and   forming a plurality of protrusions at an opening end portion of the cup-like member by placing the cup-like member into a mold.   
     
     
         11 . The method of producing the metallic member according to  claim 10 , wherein the cup-like member is formed so that an outside diameter of the opening end portion of the cup-like member is larger than an outside diameter of a bottom portion of the cup-like member. 
     
     
         12 . The method of producing the metallic member according to  claim 10 , further comprising preliminarily molding a groove that is shallower than a groove that is formed between the plurality of protrusions, the step of preliminarily molding the shallower groove being performed between the step of forming the cup-like member and the step of forming the plurality of protrusions. 
     
     
         13 . The method of producing the metallic member according to  claim 12 , further comprising performing heat treatment between the step of preliminarily molding the shallower groove and the step of forming the plurality of protrusions. 
     
     
         14 . The method of producing the metallic member according to  claim 10 , wherein the cup-like member has a hole or a recess at the center of a bottom portion thereof. 
     
     
         15 . The method of producing the metallic member according to  claim 10 , wherein the plate member has a thickness that is less than a width in a radial direction of the protrusions. 
     
     
         16 . The method of producing the metallic member according to  claim 10 , wherein the cup-like member is molded so that a width in a radial direction of the opening end portion of the cup-like member is less than a width in a radial direction of the protrusions.