Metal plate shaping method

Abstract

There are provided a step of preparing a plurality of metal plates that has a concave shape in a center principal portion except a predetermined peripheral portion, and a step of executing a thermal treatment to the plurality of metal plates in such a state that a plurality of metal plates are stacked to mate the predetermined peripheral portion with each other and also predetermined peripheral portions are pushed.

What is claimed is:  
     
         1 . A metal plate shaping method comprising the steps of: 
 preparing a plurality of metal plates that have a concave shape in a center principal portion except a predetermined peripheral portion; and    executing a thermal treatment to the plurality of metal plates in such a state that the plurality of metal plates are stacked to mate the predetermined peripheral portion with each other and also predetermined peripheral portions are pushed.    
     
     
         2 . A metal plate shaping method comprising the steps of: 
 preparing a metal plate that has a concave shape in a center principal portion except a predetermined peripheral portion; and    executing a thermal treatment to the metal plate in such a state that the predetermined peripheral portion is pushed.    
     
     
         3 . The metal plate shaping method according to  claim 1 , wherein the step of preparing the plurality of metal plates includes the step of forming the concave shape by pushing the center principal portion of a metal plate by virtue of a stamping.  
     
     
         4 . The metal plate shaping method according to  claim 1 , wherein the step of preparing the plurality of metal plates includes the steps of, 
 reducing a thickness by etching the center principal portion of a metal plate, and    forming the concave shape by pushing the center principal portion of the metal plate by virtue of a stamping.    
     
     
         5 . The metal plate shaping method according to  claim 1 , wherein the step of preparing the plurality of metal plates includes the step of forming the concave shape by etching the center principal portion of a metal plate to reduce a thickness.  
     
     
         6 . The metal plate shaping method according to  claim 1 , wherein, in the step of executing the thermal treatment, the plurality of metal plates are stacked to insert a spacer between the predetermined peripheral portions.  
     
     
         7 . The metal plate shaping method according to  claim 1 , wherein the metal plate is formed of any one selected from a group consisting of an alloy of nickel (Ni) and iron (Fe), an alloy of nickel (Ni), iron (Fe) and cobalt (Co), tungsten (W), and molybdenum (Mo).  
     
     
         8 . The metal plate shaping method according to  claim 1 , wherein the thermal treatment is executed at a temperature of 600 to 800° C.  
     
     
         9 . The metal plate shaping method according to  claim 1 , wherein the thermal treatment is executed in an atmosphere of a nonoxidizing gas.