Patent ID: 7219524

Claim:
A method for manufacturing a piping part for a high-pressure fluid, the method comprising the steps of: providing a die constructed with a first die part and a second die part defining a closed space; arranging a billet made of a raw material in the closed space within the die; and forming a body structure before a passage for the high-pressure fluid is formed, by pressing a punch to the billet after the arranging step to plastically deform the billet, wherein: in the forming step, the billet is plastically deformed in such a way that fiber flows along an area where the passage is to be formed in the body structure, wherein: the closed space within the die includes: a forward axially extending extrusion portion in which the billet, axially extending in the axial direction of the forward extension portion, is arranged in the arranging step and which extends to plastically deform the billet in a pressing direction of the punch in the forming step, and a side extrusion portion defined between the first die part and second die part and branching from the forward extrusion portion in such a way as to plastically deform the billet in a direction different from the pressing direction of the punch in the forming step; and the forming step includes a step of pressing the billet in said axial direction so that the body structure is formed to include a main portion that is plastically deformed in correspondence with the forward extrusion portion and has therein the fiber flow along the area where the passage thereof is to be formed, and a side arm portion that is plastically deformed in correspondence with the side extrusion portion and has therein the fiber flow along the area where the passage thereof is to be formed.