Method of manufacturing press-formed product, and tray and hot-press manufacturing line used for manufacturing press-formed product

A method of manufacturing a press-formed product comprising:

• a heating step in which a sheet-shaped first workpiece and a sheet-shaped second workpiece are simultaneously heated;
• a transportation step in which the first workpiece and the second workpiece heated at the heating step are transported to a press machine;
• and
• a pressing step in which the first workpiece and the second workpiece transported to the press machine are processed by the press machine,
• wherein, at the heating step, the first workpiece and the second workpiece are heated by a heating device while the first workpiece is placed on a first group of at least three struts extending upward from a tray body having an empty space extending therethrough in a top-bottom direction when viewed from above and the second workpiece is placed on a second group of at least three struts extending upward from the tray body and positioned above the first workpiece to overlap the first workpiece in a direction normal to a sheet surface of the first workpiece,
• wherein the transportation step includes:
• a first transportation sub-step in which the first workpiece and the second workpiece, together with the tray body, are transported from the heating device to a lifting location while the first workpiece is placed on the first group of struts and the second workpiece is placed on the second group of struts and positioned above the first workpiece to overlap the first workpiece in the direction normal to the sheet surface of the first workpiece;
• and
• a second transportation sub-step in which the second workpiece placed on the second group of struts, when at the lifting location, is lifted upward by a transportation device and transported to a press location for the second workpiece, and the first workpiece placed on the first group of struts, when at the lifting location, is lifted upward by the transportation device and transported to a press location for the first workpiece.