Method And Tool For Closed Die Forging

Abstract

A press tool for closed die forging a blank into a product is described. Said tool including upper and lower centre members and first and second side members. Said members define a cavity with the form of the product. In a two-step closed die forge process the blank is placed between said upper and lower centre members. The first and second side members are forced against the blank horizontally upsetting the outer edges of the blank. Then, the centre members are forced vertically into the blank, until the material in the blank has substantially filled the cavity.

1 . A method for closed die forging a product from a preform blank of a forgeable material, characterized in 
 placing the blank in a press tool, said press tool including a number of centre and side members surrounding the blank,    closing the press tool upon the blank, by vertically clamping the blank between an upper and lower centre member,    horizontally moving first and second side members synchronously towards said centre members centring the blank in the press tool,    upsetting the outer parts of said blank with the first and second said members in a continuation of said horizontal movement,    forcing the upper and lower centre members into the blank until the material of the blank fills a cavity defined by said centre and side members, by which the blank is forged with short horizontal and vertical movements of the tool avoiding large horizontal movements in the material.    
   
   
       2 . (canceled)  
   
   
       3 . (canceled)  
   
   
       4 . A tool for forging a blank into a product with the method claimed in  claim 1 , wherein the tool includes a number of upper and lower centre members, and first and second side members, said first and second side members enclosing said upper and lower centre members defining a closed cavity with the form of product, 
 said first and second side members being adapted to upset outer parts of the blank in short horizontal movements,    the upper and lower centre members being adapted to be forced into the blank causing it to fill said closed cavity.    
   
   
       5 . A tool as claimed in  claim 4 , wherein first and second side members having sloping outer surfaces, a number of press members with mating inner surfaces acting on said first and second side members in order to force said first and second side members together.  
   
   
       6 . A tool as claimed in  claim 5 , wherein first and second side members comprising upper and lower parts.  
   
   
       7 . A tool as claimed in  claim 4 , wherein first and second side members including brake surfaces forming a gutter.  
   
   
       8 . (canceled)