Nippon Steel Sumitomo Metal Corporation

Sumitomo Pipe & Tube Co., Ltd.

Sumitomo Metal Industries, Inc.

Nippon Steel Corporation

Kabushiki Kaisha Yaskawa Denki

Nippon Steel & Sumikin Pipe Co., Ltd.

Mitsubishi Jukogyo Kabushiki Kaisha

Nsk Corporation

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Toyoda Iron Works Co., Ltd.

Nsk Steering Systems Co., Ltd.

Atsushi Tomizawa

Naoaki Shimada

Shinjiro Kuwayama

Saburo Inoue

Nobuhiro Okada

Nobusato Kojima

Hiroaki Kubota

Michitaka Yoshida

Manabu Okahisa

Takashi Suyama

Yusuke Kinoshita

Takeshi Masui

Fumihiko Kikuchi

Hideo Yamamoto

Kazuya Ishii

Toyomitsu Nakamura

Hideaki Furumoto

Tamotsu Toki

Kazuhito Imai

Mitsutoshi Uchida

Kiyotaka Hori

Toru Kaneko

Shunji Kamata

Kanji Hayashi

Masaaki Mizumura

Kazuo Morimoto

Yasushi Watanabe

Mitsutoshi Kano

Masayasu Kojima

Shoichi Abe

Hidehiro Arita

Tetsuo Kajihara

Yoshiro Matsumoto

Kazuhiko Horie

Shoichi Hashimoto

Tsuneo Nakano

Ryuji Hamada

Yutaka Matsuda

Eiji Hirooka

Kazumi Shimoii

Masahiro Matsurra

Toshiya Oi

Susumu Inoue

Naoki Shimada

Mitsusato Hara

Kazuo Uematsu

A manufacturing method for a bent member of the present invention includes a holding step of holding one end portion of a long steel material having an opening end in a longitudinal direction by a chuck, a feeding step of feeding the steel material in the longitudinal direction with the one end portion as a head after the holding step, a heating step of performing high-frequency induction heating on a portion of the steel material in the longitudinal direction to form a heated portion, a bending step of moving the chuck in a three-dimensional direction to apply a bending moment to the heated portion, and a cooling step of injecting a cooling medium to the heated portion to cool the heated portion after the bending step. When the heating step is started, the chuck is cooled by the cooling medium in a state where a heating amount applied to the one end portion when the heated portion is formed on the one end portion is greater than that of an upstream side adjacent portion adjacent to the upstream side of the one end portion as seen along a feeding direction of the steel material.

Manufacturing method for bent member and hot-bending apparatus for steel material

A bending apparatus has (a) a first manipulator which feeds a hollow metal blank of closed cross section in its lengthwise direction, (b) a second manipulator which supports a first support means disposed at a first position and a metal blank while feeding it, a heating means disposed at a second position downstream of the first position in the blank feed direction for heating all or part of the circumference of the blank, and a cooling means disposed at a third position downstream of the second position for cooling a portion of the heated blank, and (c) a third manipulator which constitutes a second support means disposed at a fourth position downstream of the third position in the feed direction of the blank and which moves two-dimensionally or three-dimensionally while supporting at least one location of the metal blank to bend the metal blank into a desired shape.

Method for manufacturing a bent member

An induction heating coil for stably heating a steel tube which is being fed in its axial direction without rotating, the heating being uniform in the circumferential direction and in a narrow range in the axial direction has at least two 1-turn coils in the form of a first turn coil body and a second turn coil body. The inner peripheral length Ln (the non-effective coil length) where the effective number of coil turns is less than the total number of coil turns when the coil is projected in the axial direction and the inner peripheral length Lof the projected coil bodies (the inner coil length) satisfy Ln/L&#x3c;0.05. First and second coil bodies have insulating portions on their connecting portions, and the insulating portions are present in locations separated by a central angle of 5-45&#xb0; measured from the center of the coil bodies.

Method for manufacturing a worked member using an induction heating coil

A method for manufacturing a bent member, the method includes feeding an elongated steel material in a longitudinal direction with one end portion of the steel material as a head, performing high-frequency induction heating to one portion of the steel material in the longitudinal direction by being supplied high-frequency power to form a high-temperature portion, bending the steel material by applying a bending moment in an arbitrary direction to the high-temperature portion to form a bent portion, and injecting a cooling medium to the bent portion to cool the bent portion. The bending includes forming the bent portion having a ratio R/W which is equal to or lower than a predetermined value, where the ratio R/W is a ratio obtained by dividing a bending radius R [mm] of the bent portion on a centroid line of the steel material by a dimension W [mm] in a bend direction in a cross-section of the steel material orthogonal to the centroid line, slowing down a feeding speed of the steel material less than V, where the Vis the feeding speed of the steel material while forming the bent portion having the ratio R/W which is more than the predetermined value, and reducing the high-frequency power supplied while forming the high-temperature portion less than Q, where the Qis the high-frequency power supplied while forming the bent portion having the ratio R/W which is more than the predetermined value.

Method for manufacturing bent member, and hot-bending apparatus for steel material

A camshaft-manufacturing method includes: a split die group preparation step; a processing preparation step of preparing a cam including a through-hole, a cam body which is smaller than each of the cam accommodation portions, and ribs which are provided on both sides in a thickness direction of the cam body and configured to be fitted into the rib accommodation portions, and a hollow shaft, accommodating the cam body in the cam accommodation portion and fitting the ribs in the rib accommodation portion, and inserting the hollow shaft into the through-hole of the cam; and a processing step of performing hydroform processing, and fixing the cam to the hollow shaft by expanding the hollow shaft.

Camshaft-manufacturing method and gear shaft-manufacturing method

Not only a reduction in the load resistant performance of a structural member in a vehicle body having a quenched portion with a tensile strength of 1,470 MPa or greater, but also a reduction in the shock absorbing performance associated with the HAZ softening by welding are suppressed. In a joining structure () for a member in a vehicle body in which a first member () that is made of steel, has a closed hollow cross-section having no outward flange, and is provided with a quenched portion having a tensile strength of 1,470 MPa or greater, a base material portion having a tensile strength of less than 700 MPa, and a transition portion () between the quenched portion () and the base material portion () in a longitudinal direction thereof, and a second member () that is made of steel and overlaps the first member () are welded to each other in an overlapping portion, the overlapping portion exists over the base material portion () from the quenched portion () of the first member () through the transition portion (), and a welding portion () formed by welding exists in the transition portion () or the base material portion () in the first member ().

Joining structure for member in vehicle body

A bent product having a three-dimensionally bent portion intermittently or continuously in the lengthwise direction is manufactured by supporting a steel pipe at a first position A while feeding it in the lengthwise direction, locally heating the steel pipe being fed at a second position B, cooling the heated portion of the steel pipe at a third position C, and varying the position of a gripping means, which grips the steel pipe in a region ID downstream of the third position C, in a three-dimensional direction including the feed direction of the steel pipe in a workspace including a space on the upstream side of the third position C in the feed direction of the steel pipe to impart a bending moment to the heated portion of the steel pipe.

Method and apparatus for manufacturing a bent product

Provided is a high frequency induction heating apparatus capable of quenching a workpiece having an outward flange, over the whole circumference by means of a frequency with which a penetration depth of an electromagnetic wave is larger than a sheet thickness of the workpiece The high frequency induction heating apparatus includes a high frequency induction heating coil used for heating a long hollow steel workpiece having a closed cross section and an outward flange, in 3DQ in which a bending member is manufactured from the workpiece The high frequency induction heating coil includes a magnetic material core facing each other between which both faces of the outward flange are interposed, having a distance from both faces, and an induction heating coil connected to the magnetic material core and arranged surrounding an outer circumference of a general portion where the outward flange is excluded from the workpiece.

High frequency induction heating apparatus and processing apparatus

A bent product having a three-dimensionally bent portion intermittently or continuously in the lengthwise direction is manufactured by supporting a steel pipe at a first position A while feeding it in the lengthwise direction, locally heating the steel pipe being fed at a second position B, cooling the heated portion of the steel pipe at a third position C, and varying the position of a gripping means, which grips the steel pipe in a region D downstream of the third position C, in a three-dimensional direction including the feed direction of the steel pipe in a workspace including a space on the upstream side of the third position C in the feed direction of the steel pipe to impart a bending moment to the heated portion of the steel pipe.

Induction heating coil, and an apparatus and method for manufacturing a worked member

Method and apparatus for manufacturing a bent member

A positioning apparatus and a working system which can position a workpiece with better accuracy at a lower cost and in a reduced space even when the workpiece is heavy are provided. The positioning apparatus has 3 robot arms ()-() each having an arm and an actuator which drives the arm, a mounting platform () which is supported by the ends of the three robot arms ()-(), a securing jig () which secures a workpiece W which is mounted on the mounting platform () to the mounting platform (), and a controller () which controls the operation of each of the actuators.

Positioning apparatus, working system, and hot working apparatus

A heat treated galvannealed steel material having excellent post-painting corrosion resistance and a high strength which is suitable for use as an automotive part and a method for its manufacture are provided. A galvannealed steel material having a galvannealed coating on at least one side thereof is heat treated by heating at least a portion thereof to a temperature range in which hardening is possible. The coating remaining on the surface of at least a part of the portion which underwent heat treatment has a coating weight of at least 20 g/mand at most 80 g/mper side and an Fe content of at least 15% and at most 35%, an &#x3b7; phase is present in the coating, and the centerline average roughness Ra of the surface of the coating is at most 1.5 &#x3bc;m.

Heat treated galvannealed steel material and a method for its manufacture

A method for three-dimensionally bending a workpiece comprises feeding the workpiece by a feeding unit provided at an upstream side of the workpiece, supporting the workpiece by a supporting unit at a downstream side of the feeding unit, processing the workpiece by clamping the workpiece with a three-dimensionally movable unit that is provided downstream of the supporting unit, heating a local part of the workpiece in a temperature range which allows quenching to be performed, applying a bending moment to the heated local part of the workpiece by the three-dimensionally movable unit in association with the supporting position and/or the moving speed of the workpiece after the heating step, and rapidly quenching the heated portion. Even when a high-strength workpiece is bent, it is possible to effectively obtain a product having excellent shape fixability and uniform hardness distribution at low costs for wide application for bending sophisticated automobile parts.

Method for three-dimensionally bending workpiece and bent product

A side structure for an automobile body has an A-pillar having a first portion which has a closed cross section and which is connected to a side sill and extends upwards, and a second portion which has a closed cross section and which is continuous with the first portion and extends along a slope therefrom, and a roof rail side member which has a closed cross section and which is continuous with the A-pillar and is connected to a B-pillar. The side reinforcing member having a closed cross section and a shape which is bent three-dimensionally and which is constituted by a single member in the axial direction and has undergone high frequency quenching is disposed so a to extend at least inside the second portion and inside the roof rail side member to be positioned to the rear of the connection with the B-pillar.

Strength member for an automobile body, front side member, and side structure for an automobile body

Growing community of inventors

Minou, Japan

Atsushi Tomizawa