Roughly shaped material for forging, forged product, apparatus for molding roughly shaped material for forging, and method of molding roughly shaped material for forging

Abstract

A forging stock formed by extrusion such that its cross section perpendicular to the direction of extrusion varies along the direction of extrusion. The forging stock is cut into portions in the direction of extrusion to be forged individually, each cut portion having cross sections varying along the direction of extrusion. Each cut portion includes a pair of first parallel parts at both ends thereof in the direction of extrusion, a second parallel part, which is between the first parallel parts, and which differs in thickness from said first parallel parts, and oblique parts each of which is between the first parallel parts and the second parallel part.

1 . A forging stock which is formed by extrusion such that its cross section perpendicular to the direction of extrusion varies along the direction of extrusion. 
   
   
       2 . The forging stock defined in  claim 1  which is cut into portions in the direction of extrusion to be forged individually, each cut portion having cross sections varying along the direction of extrusion. 
   
   
       3 . The forging stock as defined in  claim 2 , wherein each cut portion has a pair of first parallel parts at both ends thereof in the direction of extrusion, a second parallel part which is between said first parallel parts and which differs in thickness from said first parallel parts, and oblique parts each of which is between said first parallel parts and said second parallel part. 
   
   
       4 . The forging stock as defined in  claim 1 , which is formed in such a way that the width remains constant along the direction of extrusion and that thick parts, a thin part, and transitional parts between said thick parts and said thin part are formed in any cross section perpendicular to the direction of extrusion. 
   
   
       5 . The forging stock as defined in  claim 1 , which is of light metal. 
   
   
       6 . A forged product which is obtained by forging from the forging stock defined in  claim 1 . 
   
   
       7 . An apparatus for forming the forging stock defined in  claim 1 , said apparatus comprising a fixed die, movable dies, and a drive mechanism, said fixed die having a forming hole provided with guide grooves extending obliquely to the direction of extrusion, said movable dies being arranged in the forming hole, and each of them having a forming face, said drive mechanism moves the movable dies along the guide grooves. 
   
   
       8 . A method for forming the forging stock defined in  claim 1 , said method employing a fixed die and movable dies, said fixed die having a forming hole with guide grooves extending in the direction oblique to the direction of extrusion, said movable dies, each having a forming face, being arranged in the forming hole, such that during extrusion, said movable dies move along said guide grooves and extrusion gives the forging stock whose cross section perpendicular to the direction of extrusion varies along the direction of extrusion.