| 摘要 |
A method of producing by forging a light alloy wheel having a disk with a large diameter by using a small-scaled press machine. A cast or forged intermediate product (3) having a circular plate portion (3b) that is to be a disk and a rim in a finished state and a thick-walled hollow-cylindrical portion (3c) is heated to a temperature at which they are easily deformed plastically. After that, the intermediate product (3) is rotated such that it is stopped at every predetermined angle, and when stopped, at least a part of the to-be-disk portion is pressed by a die. This causes the material to be extruded into a recess portion (2a) of a lower die, adding holes (4). A pattern is added to the entire part of the circular plate portion that is to be the disk by sequentially repeating the above operation, and then the disk and the rim are press-formed and finished. |
