Patent ID: 11970212
Assignee: JFE STEEL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 4:
5. An automotive-structural-part manufacturing method of manufacturing the automotive structural part according to claim 3 by bending one metal sheet, the automotive-structural-part manufacturing method comprising:
a first bending step of, by using a punch and a pad configured to sandwich the metal sheet and a pair of first cams disposed on both sides of the punch and the pad, the first cams being configured to move toward the punch and the pad, bending the metal sheet into an intermediate product formed of the top portion, the side wall portions, and the vertical rib portions by moving the first cams toward the punch and the pad to fold parts of the metal sheet corresponding to the respective vertical rib portions of the automotive structural part while a part of the metal sheet corresponding to the top portion of the automotive structural part is sandwiched by the punch and the pad; and
a second bending step of, by additionally using a second cam disposed on an end part side of the punch and the pad where the other automotive structural part is joined, the second cam being configured to move toward the punch and the pad, bending the intermediate product into the automotive structural part by moving the second cam toward the punch and the pad to bend a part of the metal sheet corresponding to the flange portion of the automotive structural part while the top portion of the intermediate product is sandwiched by the punch and the pad, and the side wall portions and the vertical rib portions of the intermediate product are sandwiched by the punch, the pad, and the first cams, wherein
on the end part side of the groove portion where the other automotive structural part is joined, the second bending step includes
forming a flange portion adjacent to top by bending upward a part of the metal sheet extending from the top portion,
forming a flange portion adjacent to side wall by bending outward a part of the metal sheet extending from each of the side wall portions, and
forming a vertical-rib flange portion by folding a part of the metal sheet extending from each of the vertical rib portions.