Method for producing light alloy vehicle wheel

Abstract

A method for producing a light alloy vehicle wheel in which a casting material is forged to produce a rim-integrated vehicle wheel, the method comprising: a casting step of preparing a flat, square billet by continuous casting or semi-continuous casting using a mold whose mold outlet port is formed into a substantially rectangular shape; a cutting step of cutting the flat, square billet at a right angle to a casting direction to flatly form a rectangular casting material in the casting direction; a primary forging step of pressing down the rectangular casting material from a flat surface side of the rectangular casting material to forge the rectangular casting material into a disc shape; and a secondary forging step of forging the disc-shaped forging product into a rough wheel shape having a disc portion and a rim portion.

1 . A method for producing a light alloy vehicle wheel in which a casting material is forged to produce a rim-integrated vehicle wheel, the method comprising:
 a casting step of preparing a flat, square billet by continuous casting or semi-continuous casting using a mold whose mold outlet port is formed into a substantially rectangular shape;   a cutting step of cutting the flat, square billet at a right angle to a casting direction to flatly form a rectangular casting material in the casting direction;   a primary forging step of pressing down the rectangular casting material from a flat surface side of the rectangular casting material to forge the rectangular casting material into a disc shape; and   a secondary forging step of forging the disc-shaped forging product into a rough wheel shape having a disc portion and a rim portion.   
     
     
         2 . The method for producing the light alloy vehicle wheel according to  claim 1 , wherein
 a ratio of a short side and a long side of the mold outlet port is 1:1.5 or more and a short-side length is 200 mm or less in the mold, and the flat, square billet is prepared using the mold.   
     
     
         3 . The method for producing the light alloy vehicle wheel according to  claim 1 , comprising
 a step of scraping a chill layer by machining, the chill layer being formed in a casting surface corresponding to a wheel design surface in the flat rectangular casting material.   
     
     
         4 . The method for producing the light alloy vehicle wheel according to  claim 1 , wherein
 the mold is formed by a semi-fire-resistant mold to suppress formation of a segregation layer in a surface of the flat, square billet, and therefore surface scraping is eliminated in the casting surface of the flat, rectangular casting material.