Patent ID: 8590357

Claim:
A metal manufacturing method of manufacturing a plurality of metal objects from a single metal plate, the method comprising: an interval specification step which specifies the interval of the feature pattern which is repeatedly produced on a plurality of metal objects by a twist processing and, when manufacturing the plurality of metal objects by cutting a plurality of laminated metal plates after twisting processing; a determination step which determines a number of times of twist performed by the twist processing based on a length of the a plurality of metal objects in a direction of rotation axis of the twist processing and the interval specified at the interval specification step; a lamination step which laminates the plurality of metal plates; a junction step which joins the plurality of metal plates laminated by heating and pressurizing; a twist step which performs twist processing to the plurality of metal plates joined at the junction step by heating so that inversions of back and front of the number of times of twist determined at the determination step occurs; a plate formation step which forms a metal plate by processing the plurality of metal plates into a shape of plate; and a cut step which cuts the metal plate formed at the plate formation step into a first and second metal objects having a common shape of section which intersects perpendicularly in an rotation axis direction and on which a feature pattern having the specified interval, wherein the cut step further includes cutting the metal plate into a third metal object having shape of a section which is different from the section of the first metal object, from the plurality of metal plates laminated, the determination step calculates the number of times of twist by dividing a total length of a length of a direction of the circumference of the first object and the second object having a predetermined section, a length of a portion which forms an end portion at the time of the twist step which is omitted as an unnecessary portion and which is converted into the section by the specified interval by which the feature pattern is formed on the predetermined position of the first object, the second object and the third object.