PURPOSE: To work asymmetrical section bandlike goods having no bend by use of an existing press, by pressing a wide stepped part by long pressure width in the longitudinal direction, and pressing a narrow stepped part by short pressure width.
CONSTITUTION: A base material 9 is placed on a lower anvil 8, and the first pressure of a wide stepped part 2 is executed by pressure width a2 in the longitudinal direction by a square punch 7. Subsequently, the base material 9 is moved to a prescribed position on the lower anvil 8, and the first pressure of a narrow stepped part 3 is executed. Pressure width a3 in the longitudinal direction in this case is shorter than the pressure width a2. Subsequently, the base material 9 is fed by the length a3 in the longitudinal direction, it is repeated to feed it by the length a3 after pressing by the pressure width a3 in the same way as the previous pressure, and the pressure is applied to the same length as the pressure width a2 in the longitudinal direction of the first time of the wide stepped part 2. Subsequently, the base material 9 is fed by length a2 in the longitudinal direction, and the second pressure of the wide stepped part 2 is executed in the same way as the previous pressure. Said pressure process is repeated successively, and the pressure is executed over the whole length of the base material 9, by which desired asymmetrical section bandlike parts are obtained.
ASAO HIROSHI
WATANABE SHINOBU
Next Patent: FORGING DIE