Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Sintokogio, Ltd.

Arcelormittal France

Arcelor France

Nippon Steel & Sumitomo Metal Corporatin

Usinor

Mitsuharu Yamagata

Shuji Yamamoto

Yasuhiro Wada

Toshiyuki Niwa

Noriyuki Suzuki

Akihiro Uenishi

Takuya Kuwayama

Yukihisa Kuriyama

Koki Tanaka

Michio Kaneko

Hiroshi Kihira

Yoichi Ikematsu

Wataru Hisada

Yoichi Matsuzaki

Yasushi Tsukano

Kazuto Kawakami

Suguru Suzuki

Takeshi Kawachi

Yasunori Ito

Yutaka Mikazuki

Nobuo Yoshikawa

A lateral surface member structure () of a vehicle body () includes a tubular body () extending in a front-rear direction of the vehicle body () and an impact absorbing member () disposed inside the tubular body (). The impact absorbing member () includes a web () extending along the front-rear direction and flat in a vehicle width direction, a vehicle outer flange () joined to a vehicle outer end portion of the web () and extending along the front-rear direction, and a vehicle inner flange () joined to a vehicle inner end portion of the web () and extending along the front-rear direction. The vehicle outer flange () and the vehicle inner flange () each include a rib (R,R) disposed so as to sandwich the web () from above and below and extending along the front-rear direction.

Lateral surface member structure of vehicle body

A press forming method includes a first process of obtaining a pressing force applied to each portion of a tool by an workpiece material during press forming while independently driving the respective each portion of the tool divided into multiple portions and press forming the workpiece material, and a second process of adjusting at least one of an applied driving force, an applied driving speed, and an applied driving timing for each portion of the tool to cause a processing portion of the workpiece material in which the state approaching an overload state is detected based on the pressing force to flow to other processing portions of the workpiece material.

Press forming method and tool for press forming

There is provided a method for estimating a hardness of a cold worked component including: preparing a test piece for hardness measurement having a dent portion of a shape corresponding to a shape of the contact surface of the punch by using a mounting base on which a test piece is mounted and a punch of which a contact surface to be in contact with the test piece is a curved surface, and compressing the test piece mounted on the mounting base using the punch; measuring hardnesses of the test piece for hardness measurement at a plurality of hardness measurement positions in a measurement direction while taking, as the measurement direction, a direction in the dent portion in which a sheet thickness changes; performing numerical analysis to calculate equivalent plastic strains of the test piece for hardness measurement, and acquiring a hardness-equivalent plastic strain curve on the basis of the hardnesses and the equivalent plastic strains at the hardness measurement positions; and specifying a hardness from the calculated value of equivalent plastic strain of an arbitrary part of the cold worked component on the basis of the hardness-equivalent plastic strain curve by performing numerical analysis to calculate a value of equivalent plastic strain of a cold worked component.

Method for estimating hardness of cold worked component and method for acquiring hardness-equivalent plastic strain curve of steel material

A method of manufacturing a tooth-shaped component including a process of draw-forming a workpiece so as to obtain a cylindrical container, which has a bottom surface portion and a side surface portion; a diameter-reducing process of reducing the diameter of a particular part in which a tooth tip portion is to be formed in the side surface portion of the cylindrical container, so as to increase the thickness of a corner portion such that an external shape of the corner portion between the bottom surface portion and the side surface portion satisfies the following conditional expression (&#x394;R+&#x394;H)&#x2264;2t; and a tooth shape-forming process of forming the tooth tip portion in the particular part of the cylindrical container reduced in diameter in the diameter-reducing process, so as to obtain a tooth-shaped component which has the bottom surface portion, the side surface portion, and the tooth tip portion.

Method of manufacturing tooth-shaped component, and tooth-shaped component

A method of manufacturing a mechanical part of the present invention includes a first process of forming, by performing a folding processing to an end portion of the material, a portion to be processed having a structure, in which a plurality of layers respectively having a thickness corresponding to a plate thickness of a material overlap each other, in the material such that a plate thickness direction of the layer is orthogonal to a plate thickness direction of the material; and a second process of changing, by performing a forging processing to the portion to be processed, a shape of the portion to be processed to a target shape while press-welding the layers of the portion to be processed to each other by plastic deformation.

Method of manufacturing mechanical part and mechanical part

A forming die includes: a lower forming die having a bottom part and a side wall part; an upper forming die that is movable toward the bottom part of the lower forming die along an axis parallel to the side wall part of the lower forming die; and a push-in die that is movable toward the bottom part of the lower forming die along the axis between the side wall part of the lower forming die and the upper forming die.

Forming die, and undercut forming method

While a compression part (B) in a bottom wall part of a cup-shaped workpiece (B) is compressed by an inner punch () and an inner die () and moved in a direction to get away from an intermediate die (), the inner die () is pushed toward the inner punch (); and a compression part (B) being an outer end portion in a radial direction of the workpiece (B) is compressed by an outer punch () and an outer die () and moved in an direction to approach the intermediate die (), to thereby suppress the workpiece (B) in the compression part (B) from material-flowing in a direction to get away from a central axis (), whereby thickness reduction processing of the compression part (B) and thickness increase processing of a vertical wall part (B) of the workpiece (B) sandwiched by an intermediate punch () and the inner die () and a vertical wall part (B) of the workpiece (B) sandwiched by the intermediate punch () and an outer die () are performed.

Press-forming method

A press-forming method includes: a step of forming a first cup-shaped workpiece (B); a step of moving an axial pressing punch () relatively to a die () to abut on a cup opening end (B) of a cup sidewall portion (B), and while constraining the cup opening end (B), moving a second-stage forming punch () relatively to the die () to insert the second-stage forming punch () into a second die hole portion (), and pushing a part of the first cup-shaped workpiece into the second die hole portion () through a second die shoulder portion (), to thereby reduce the cup sidewall portion (B) in diameter and thicken the cup sidewall portion (B); and a step of, in a state of the constraint of the cup opening end (B) by the axial pressing punch () being released, moving the second-stage forming punch () relatively to the die () and further pushing the first cup-shaped workpiece deeper in the second die hole portion (), to thereby form a second cup-shaped workpiece smaller in diameter than the first cup-shaped workpiece.

An inner punch (), an outer punch (), and a die () are disposed on the same center axis (). The outer punch () is disposed so as to be apart from the inner punch () in a radial direction perpendicular to the center axis () by a first space Swhich is larger than a plate thickness T of a cup longitudinal wall portion (A). Further, an inner peripheral surface of the outer punch () has, on its die () side, a punch shoulder R portion (A) widening as it goes toward the die (). A cup bottom portion (A) is sandwiched by the inner punch () and the die () while an outer peripheral surface of the inner punch () and an inner peripheral surface of the cup longitudinal wall portion (A) are apart from each other by a second space S, and drawing to radially reduce the cup longitudinal wall portion (A) is performed by pushing the cup longitudinal wall portion (A) toward the outer peripheral surface of the inner punch () by the outer punch () while making the outer punch () abut on the cup longitudinal wall portion (A) from the punch shoulder portion (A), whereby a surplus material is made to flow into a cup shoulder portion (A) to thicken the cup shoulder portion (A).

Press forming method

A press forming apparatus () consecutively carries out: a first step of pushing a flat plate-shaped workpiece into a die () by a forming punch (), to form the workpiece into a cup-shaped workpiece (B); a second step of making the cup-shaped workpiece (B) move relatively to a position where a space (S) is formed between a cup bottom part (B) and the forming punch () by a holding down member () abutting on an end part of a cup vertical wall part (B); and a third step of making a counter punch () approach the forming punch (), to push a cup bottom part (B) to a forming punch () side so that the cup bottom part (B) is compressed by the forming punch () and the counter punch (), making a material of the cup vertical wall part (B) flow to a cup shoulder part (B), thereby to thicken the cup shoulder part (B).

A press mold includes an inner punch (), an intermediate punch () disposed along an outer periphery of the inner punch () and having an intermediate punch inclined portion () at a leading end, an outer punch () disposed along an outer periphery of the intermediate punch (), and a die () having a die inclined portion () facing the intermediate punch inclined portion (), central axes () of all of which are coaxially disposed. While a bottom portion of a bottomed container () is constrained by the inner punch () and the die (), an end portion of the bottomed container () is pressed by the outer punch (), and the intermediate punch () is moved in a direction opposite a direction in which the outer punch () is pressed, whereby a bottomed container inclined portion () of the bottomed container () sandwiched by the intermediate punch inclined portion () and the die inclined portion () is thickened.

Press-work method and bottomed container

Exemplary embodiments of a press-forming device, press-forming method, computer program/software arrangement and storage medium can be provided. The exemplary press-forming device can include a material characteristic input configured to input material characteristics. A state variable detector can be configured to measure a state variable comprising a metal mold distortion amount. A processing condition computer arrangement can be configured to determine from a first moment to a second moment at least one particular processing condition. Further, a processing condition controller can be configured to control the at least one processing condition from processing conditions.

Press-forming device, press-forming method, computer program/software arrangement and storage medium

The present invention releases a method of producing a metal separator for a solid polymer fuel cell by stainless steel, titanium, or titanium alloy during which securing lower cost and mass producibility by using a material having a high workability to form a complicated shape by a high productivity, then using an inexpensive blast process to drive a conductive substance into the surface of the metal separator member, that is, provides a stainless steel, titanium, or titanium alloy solid polymer fuel cell separator comprised of stainless steel, titanium, or titanium alloy in the surface of which a low ion release conductive substance is buried, having an arithmetic mean roughness (Ra) of the separator surface of 0.5 to 5.0 &#x3bc;m, having a 10-point mean roughness (Rz) of 3 to 20 &#x3bc;m, having an average spacing of surface relief shapes (Sm) of 300 &#x3bc;m or less, having values of a warp rate and twist rate of a separator of 0.1 or less, and having a contact resistance value with respect to carbon paper of 15 m&#x3a9;cmor less at a surface pressure of 1 MPa.

Stainless steel, titanium, or titanium alloy solid polymer fuel cell separator and its method of production and method of evaluation of warp and twist of separator

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Tokyo, Japan

Mitsuharu Yamagata