Jfe Steel Corporation

Yasuhiro Kishigami

Yuji Yamasaki

Toyohisa Shinmiya

Yusuke Vincent Fujii

Kinya Nakagawa

Eiji Iizuka

Yusuke Fujii

A press forming method includes: moving a die toward a punch; bringing a punch side and a die side elastic bodies into contact with a metal sheet; and press forming the metal sheet, wherein an amount of protrusion of the punch side elastic body is set so that the punch side elastic body: comes into contact with the metal sheet before the punch; and becomes flush at a bottom dead center, and an amount of protrusion of the die side elastic body is set so that: the die side elastic body comes into contact with the metal sheet before the punch; and a product of: a load of the die side elastic body; and a friction coefficient between the die side elastic body and the metal sheet, becomes equal to or larger than an absolute value of a difference between tensions acting on the portions sandwiching a character-line equivalent portion.

Press forming method and press forming apparatus for outer panel of automobile

A method for press forming an automotive outer panel includes: providing an elastic body to a punch such that the elastic body abuts against a metal sheet away from a portion corresponding to a character line in the metal sheet; abutting a contact surface portion of the protruding elastic body against the metal sheet; and forming the character line with the ridgeline and the valley line by relatively moving the die toward the punch while abutting the contact surface portion against the metal sheet to deform the elastic body such that the elastic body becomes flush with the punch-side forming surface portion at a bottom dead center of forming. A protrusion amount of the elastic body from the punch-side forming surface portion is set such that the elastic body contacts the metal sheet before the ridgeline contacts the metal sheet to cause the metal sheet to become plastically deformed.

Method for press forming and apparatus for press forming automotive outer panel

A press forming method for an automotive outer panel according to the present invention is a method for press forming a metal sheetinto an automotive outer panelhaving a character lineand panel surface portionsandby using a punch, a die, and a blank holder. The press forming method includes: a step of providing an elastic bodyprotruding toward the punchside on a die-side forming surface portionb forming the panel surface portion, and bringing the elastic bodyinto contact with the metal sheetprior to the die; and a step of press forming while crushing the elastic bodyand pressing the metal sheet, and the elastic bodyis caused to protrude from the die-side forming surface portionso that a frictional force of the crushed elastic bodyand the metal sheetis equal to or greater than an absolute value of a difference between tensions acting on both sides of a portioncorresponding to the character line

Press forming method and press forming apparatus for automotive outer panel

Provided is a method for forming a blank, the method being capable of improving both yields and formability. The method for forming a blankincludes forming the blankinto a preforming shape by plastic deformation and then plastically deforming the blankfrom the preforming shape into a final shape. The preforming shape is determined so that, in each of cross sections in the final shape, the ratio (L/L) of a cross-sectional line length Lin the preforming shape to a cross-sectional line length Lin the final shape in the same cross section position falls within a predetermined tolerance range.

Method for forming blank and method for determining preforming shape

There is provided a method of manufacturing a curved channel part having a curved portion in a vertical wall portion by press forming, the method restricting stretch flange deformation, which occurs in the vertical wall portion and a flange portion. The method includes a shear deformation step as a step of forming the vertical wall portion. In the shear deformation step, a boundary-side portion of a base section of a blank with respect to a deformation section, and an outer portion of the deformation section are individually restrained, a portion to be a vertical wall portion of the deformation section is shear-deformed in a sheet face, and a material is caused to flow from a portion separated from a curved portion toward the curved portion in an outer edge portion of the portion to be the vertical wall portion.

Press forming method and method of manufacturing press-formed part

A method of producing a polygonal closed cross-section structural component includes press-forming a metal sheet into a gutter-shaped pre-processed part with a curved form along its longitudinal direction having plural ridge lines corresponding to corner portions of the polygonal closed cross-section in a cross-sectional form developed by cutting the component at a position corresponding to the ridge line located at the innermost side in the radial direction to provide a flange portion extending along the ridge line at the resulting respective ends, and press-forming the pre-processed part to deform inwardly in the cross-sectional direction at a position of one or more of the plural ridge lines to butt the ridge lines located at the innermost side and the flange portions to each other.

Method of producing polygonal closed cross-section structural component with a curved form and polygonal closed cross-section structural component produced by the method

Growing community of inventors

Chiba, Japan

Yasuhiro Kishigami