Method and apparatus of forming tailored blank plate

A method of forming a tailored blank plate having a stepped part in which a thin plate is integrally connected to a thick plate, the forming method comprising:

• positioning the tailored blank plate by mounting a side of the stepped part of the tailored blank plate on a first punch protruding part swollen on a first punch part;
• pressing a plate part of the tailored blank plate including a connecting surface of the thin plate and the thick plate, by making a first die part in contact with the positioned tailored blank plate, displacing the first die part with respect to the first punch protruding part, and pressing a pressing part of the first die part to the plate part;
• press-forming the tailored blank plate by moving first punch part and the first die part to relatively come close to each other while fixing the stepped part of the tailored blank plate between the first punch protruding part of the first punch part and a first punch recessed part of the first die part;
• and
• re-striking the press-formed tailored blank plate, wherein the step of re-striking comprises:
• mounting the press-formed tailored blank plate on a second punch part for re-striking so that the tailored blank plate is bridged over at least one set of second punch protruding parts formed in the second punch part;
• and
• displacing a second die part for re-striking toward a part between the second punch protruding parts and pressing the part between the second punch protruding parts by a pad, so as to re-strike the tailored blank plate by the second punch part and the second die part.