Nippon Steel Corporation

Nippon Steel & Sumitomo Metal Corporation

Ryuichi Nishimura

Koji Hashimoto

Koichi Sato

Yoshiaki Nakazawa

Kenichiro Otsuka

Yasuhiro Ito

Yasunori Sawa

Toru Yonebayashi

Toshiya Suzuki

Koichi Hamada

Tohru Yoshida

Masahiro Saito

Takeshi Kawachi

Keiji Ogawa

Yoshihiko Masuo

Takashi Yamamoto

Masafumi Azuma

Atsushi Ono

Takashi Miyagi

Yasuharu Tanaka

Hiroshi Nogami

Masanori Yasuyama

Atsuo Koga

Satoshi Shirakami

Yoshiyuki Ikeda

Takahiro Fujimoto

Mai Nagano

Yuki Ichikawa

Naruo Miyabe

Shohei Yamazaki

Takuya Oishi

Junki Natori

Mitsuhiro Okamoto

Seiya Ishii

Kumpei Sano

Yuiko Shiotani

Ryuichi Harada

Yorifumi Sakamoto

A stiffened panel structure includes a panel-shaped component and a wire. The panel-shaped component has a panel body that curves in such a manner as to be convex outward. The wire has a first end portion and a second end portion. The first end portion is bonded to a first point on the inner surface of the panel body. The second end portion is bonded to a second point on the inner surface of the panel body. The wire is strained between the first point and the second point.

Stiffened panel structure

A method of manufacturing a press-formed product includes: capturing the sheet thickness of a sheet B; and using a die, a punch, and a movable mold part capable of moving relative to both the dieand punchto press-form the sheet B into a press-formed product. During press-forming, the initial position of the movable mold part relative to the dieor punchis controlled depending on the sheet thickness of the sheet B.

Method of manufacturing press-formed product and press line

An automobile hoodhas an inner panel, an outer panel, and a plurality of linear sealer regions A in which jointsare arranged. A region which includes the linear sealer region A and in which both ends in a longitudinal direction L of the linear sealer region A reach the outer circumferential edge of the inner panelis defined as an end-to-end region B. Each of three longest linear sealer regions A, Aand Aamong the plurality of linear sealer regions A is a length that is 40% or more of the length of an end-to-end region B, Bor Bto which the linear sealer regions A, Aor Abelongs, respectively. These three end-to-end regions B, Band Bdo not intersect with each other within a region surrounded by the outer circumferential edge of the inner panel

Automobile hood

A method for manufacturing a press-formed product suppresses occurrence of a forming defect such as a crack in a starting material during press forming, and also suppresses occurrence of problems when transferring a starting material during press forming. A manufacturing intermediate is formed by forming, in a flat-sheet shaped blank sheet, a planned outline portion including an undulating shape which is used for forming an outline of an outer circumferential portion of a press-formed product. The flat shape of the blank sheet is maintained in a region from the planned outline portion toward the center of the manufacturing intermediate, or an intermediate stretch-formed portion having a predetermined intermediate forming height is formed in the manufacturing intermediate in the region. A through-hole is formed by piercing a flat portion at which the flat shape is maintained or a stretch-formed-side top portion of the intermediate stretch-formed portion.

Method for manufacturing press-formed product

A brake disk unit includes a rotating member, a brake disk, and a control member. The brake disk includes a disk main body, fins, and convex portions and/or concave portions. The control member includes a support portion and a projecting portion. At least a part of the projecting portion is arranged between fins that are adjacent in the circumferential direction of the brake disk. A gap is formed between the projecting portion and the brake disk. On the surface of the brake disk, the convex portions and/or the concave portions are provided further on the outer side in the radial direction of the brake disk than a minimum opening portion of the gap.

Brake disk unit for railway vehicle

There is provided an exterior panel including a steel sheet, the steel sheet including a flat portion, wherein in an outer-layer region of the flat portion, a microstructure contains, in volume fraction, ferrite of 80% or more, an average grain diameter of ferrite is 1.0 to 15.0 μm, an intensity ratio Xof ferrite is 0.30 or more to less than 3.50, when uEldenotes a uniform elongation measured with a tensile test specimen cut from the flat portion, and uEldenotes a theoretical uniform elongation that is derived from volume fractions, hardnesses, and average grain diameters of ferrite and martensite in a microstructure of an inside region of the flat portion, and a sheet thickness of the flat portion, uEl/uElis 0.44 to 0.80.

Exterior panel and automobile including the same

A method of manufacturing a press-formed product includes: capturing the amount of warp in a sheet to be pressed separately for each sheet; and using a die, a punch, and a movable mold part to press-form the sheet into a press-formed product. During press-forming, the initial position of the movable mold partrelative to the dieor punchis controlled depending on the amount of warp in the sheet.

In an automobile inner panel and an automobile panel that includes the automobile inner panel, panel rigidity of the panel is secured while achieving a weight reduction. An automobile inner panelhas a plurality of sub-unitsthat each include a flange, an inclined wallcontinuous with the flange, and a bottom portioncontinuous with inclined walland separated from the flange. The bottom portionsandof the sub-unitsandwhich are adjacent to each other are butted against each other and are directly continuous with each other. A maximum value of a distance Dbetween two of the flangesandof two of the sub-unitsandin which the bottom portionsare arranged separated from each other and which are adjacent to each other is 250 mm or less.

Automobile inner panel and automobile panel

A formed bodyincludes a first flange, a body portion(a first vertical wall portion, a top plate portion, a second vertical wall portion), and a second flange, and the formed bodyis made of steel having tensile strength of 440 MPa or more. The first flangeextends toward the second flangefrom an edge portion of the first vertical wall portion. The first flangeand the body portioncurve so as to conform to each other as viewed from the direction orthogonal to the top plate portion

Formed body, structural member, and method for producing formed body

A method for producing a press-formed product includes a first pressing step and a second pressing step. In the first pressing step, an intermediate formed product is formed from a processed material by using first press tooling. The intermediate formed product includes a stepped section of a top plate section, a temporary vertical wall section adjacent to the top plate section via a ridge section and having at least part of the shape of the vertical wall section, and a temporary flange section adjacent to the temporary vertical wall section via a temporary ridge section. In the second pressing step, the press-formed product is formed from the intermediate formed product. In the second pressing step, forming is performed such that the temporary ridge section is moved toward the temporary flange section with at least part of the top plate section of the intermediate formed product restricted.

Method for producing press-formed product

A method and apparatus for manufacturing a press component without generating cracks in a flange on an inner circumferential side of a curved portion includes press working by a free bending method on a blank consisting of an ultra-high tensile strength steel sheet. A press component is manufactured by performing cold press working on a blank of an ultra-high tensile strength steel sheet. By the press working, a material inflow facilitating portion that increases the amount by which a portion of the blank to be formed into an end portion of the press component flows into a portion of the blank to be formed into a flange on an inner circumferential side of the curved portion of the press component is provided in the vicinity of the portion of the blank to be formed into the flange on an inner circumferential side of the curved portion of the press component.

Method and apparatus for manufacturing press component

A method for producing a press-formed product that includes a pair of flat sections and a bend section that connects the flat sections, in which a bending radius of the bend section is Rand an interior angle formed by the pair of flat sections is &#x3b8;, includes the steps bellow. In the first forming step, an intermediate formed product including a bend section in which a bending radius is Rand an interior angle is &#x3b8;is formed. In the second forming step, a portion of a bend section of the intermediate formed product is formed into the bend section of the press-formed product. R, &#x3b8;, Rand &#x3b8;satisfy the conditions of Formulae (1) to (3) below:1.05&#x3c;&#x2003;&#x2003;(1);1.0&#x3c;&#x2003;&#x2003;(2);&#x3c;6.0/()&#x2003;&#x2003;(3),

Production method for producing a press-formed product

A method for manufacturing the structural member (), the method including: a first step in which the pad () presses the forming material () against the punch () to raise a portion corresponding to a flange to be formed in ends of at least the gutter bottom () and the ridge () in a direction opposite to the pressing direction, the pad () bends an end of a portion to be formed into the ridge () in the pressing direction and restrains at least a part of the end, and the punch () and the die () carry out press forming to form an intermediate product while a region other than an end in a portion to be formed into the gutter bottom () remains unrestrained.

Method and press-forming apparatus for manufacturing structural member for automotive body

A press forming apparatus includes: a punch; a blank holder disposed adjacent to the punch; a die being a counterpart of the punch; and a pad disposed to face the punch. The punch has a tip surface, an outside surface, and a stepped surface having shapes corresponding to a web portion, vertical wall portions, and a flange portion of a product, respectively. When the punch and the die are relatively moved in a pressing direction in a state where a middle portion in a width direction of a workpiece is sandwiched by the pad and punch and an outer peripheral portion in the width direction of the workpiece is bound by the blank holder and the die, the workpiece's outer peripheral portion in the width direction gets out from between the blank holder and the die, and the flange portion is shaped by the die and the punch's stepped surface.

Press forming apparatus and press forming method

[Object] To achieve a weight reduction of a car body structure while maintaining collision safety to impacts from the rear side of the vehicle. [Solution] Provided is a vehicle rear portion structureincluding a pair of rear framesprovided in the vehicle length direction and a rear floor paneljoined to the pair of rear frames, in which the rear floor panelhas a concave sectionprovided from the rear side of the vehicle toward the front side of the vehicle of the rear floor panel, and the concave sectionis formed of a metal sheet having a tensile strength more than or equal to the tensile strength of the pair of rear frames. By this configuration, when an impact load from the rear side of the vehicle acts on the concave sectionof the rear floor panel, the rear floor panelcan absorb collision energy in a principal way. Thus, the burden of absorption of collision energy by the rear framesis reduced, and accordingly it becomes possible to reduce the wall thickness and the length of the rear frameand a weight reduction of the entire car body structure is achieved.

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Tokyo, Japan

Ryuichi Nishimura