METHOD FOR MANUFACTURING PRESS PRODUCT PROVIDED WITH INTEGRATED FLAT PART AND ROD PART, AND METHOD FOR MANUFACTURING VARIABLE VANE FOR VGS-TYPE TURBO CHARGER IN WHICH METHOD FOR MANUFACTURING PRESS PRODUCT IS APPLIED

摘要

[Problem to be solved] To provide a novel method for efficiently manufacturing a press product that includes, in an integrated manner, a flat part (a vane part) and a rod part (a shaft part) having a diameter greater than the thickness of the flat part. [Solution] The present invention includes steps of: preparing a preformed material in which a blank material is prepared as a preformed material for a press product (a variable vane); forging a rod part in which the preformed material is formed into a desired shape by interposing the preformed material between a pair of opposed dies and pressing mainly the rod part from a direction orthogonal to a punching direction; and trimming a rod part in which an unnecessary portion resulted from the forging processing is trimmed. The preformed material remains in contact with a part of a strip material to be passed along in the progressive processing. The step of forging a rod part is performed upon turning over the preformed material in a punching orientation by 90° with respect to the strip material and changing the orientation of a flat part into a vertical direction, the preformed material having been blanked in the step of preparing a preformed material. The subsequent step of trimming a rod part is also performed while the flat part is oriented in the vertical direction.