Patent ID: 11931787
Assignee: SEKI PRESS CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method for forming one or more protrusions on one or more surfaces of a metal workpiece, the method comprising:
clamping and fixing the metal workpiece between a support die and a pressure die,
wherein at least one of the support die and the pressure die has one or more through-holes to serve as one or more female molds;
pressing end cross sections of two or more outer peripheral end parts of the metal workpiece fixed between the support die and the pressure die at two or more different positions from two or more directions toward the to be formed protrusions on one surface of the metal workpiece by press molding using a pressing die or a pressing jig that is a separate individually movable component from the support die and the pressure die; and
forming the one or more protrusions by further pressing the outer peripheral end parts with the pressing die or pressing jig to cause metal plastic flow of the metal workpiece into said one or more female molds,
wherein the pressing is performed at a temperature lower than a softening point of a metal used as the metal workpiece without heating the metal workpiece;
wherein the two or more directions are perpendicular or oblique to an upright direction of the protrusions to be formed on one surface of the metal workpiece;
wherein said outer peripheral end parts are positioned in point symmetry on sides of the metal workpiece when a center of a bottom surface of the one or more to be formed protrusions is a symmetrical center.