公开(公告)号：US20170314094A1

公开(公告)日：2017-11-02

申请号：US15524001

申请日：2015-11-20

Applicant: NETUREN CO., LTD.

Inventor： Hironori OOYAMA ,  Fumiaki IKUTA

IPC: C21D9/46 ,  C21D1/40 ,  B21D22/02 ,  C21D1/42 ,  C21D1/673 ,  H05B3/00

CPC classification number: C21D9/46 ,  B21D22/02 ,  C21D1/40 ,  C21D1/42 ,  C21D1/673 ,  C21D9/0068 ,  H05B3/0004 ,  H05B2203/016 ,  Y02P10/253

Abstract: A heating method, a heating apparatus and a method for fabricating a press-molded article using the heating method is provided. A plate workpiece has a main heating target region having a cross sectional area monotonically varying in a first direction and a sub heating target region provided adjacent to and integrally with the main heating target region. After heating the sub heating target region, the main heating target region is heated by a direct resistance heating to heat the main heating target region and the sub heating target region to be in a target temperature range. To heat the main heating target region, at least one of a pair of electrodes arranged to extend across the main heating target region in a second direction intersecting the first direction is moved in the first direction and at a constant speed, with electric current between the pair of electrodes being adjusted.

公开(公告)号：US20160346828A1

公开(公告)日：2016-12-01

申请号：US15117293

申请日：2015-03-17

Applicant: NETUREN CO., LTD.

Inventor： Yoshitaka KUWAHARA ,  Kazuki MORI ,  Mitsuhiro OKAMOTO ,  Takashi IKEDA ,  Fumiaki IKUTA

IPC: B21J5/08 ,  B21J13/00

CPC classification number: B21J5/08 ,  B21J13/00 ,  B21K1/12

Abstract: A shaft holding sleeve is inserted in a fitting hole of a compressing machine of a shaft diameter enlarging apparatus that applies an axial compression stress to a shaft stock to hold an end portion of the shaft stock during a shaft diameter enlarging process for radially enlarging a portion of the shaft stock. The shaft holding sleeve includes a front end surface to be inserted in the fitting hole, an exposed portion to be exposed to an outside of the fitting hole, and at least one air communication passage extending from the front end surface to a surface of the exposed portion. A jig may be attached to the shaft diameter enlarging apparatus to facilitate the insertion of the shaft holding sleeve into the fitting hole.

Abstract translation: 轴保持套筒插入轴直径扩大装置的压缩机的装配孔中，该轴直径扩大装置在轴直径扩大过程中向轴坯施加轴向压缩应力以保持轴坯的端部，以径向扩大部分 的轴库存。 轴保持套筒包括插入到装配孔中的前端面，暴露于装配孔外部的暴露部分，以及至少一个空气连通通道，从前端表面延伸到露出的外表面 一部分。 夹具可以附接到轴直径扩大装置，以便于将轴保持套筒插入到装配孔中。

公开(公告)号：US20190218635A1

公开(公告)日：2019-07-18

申请号：US16361813

申请日：2019-03-22

Applicant: NETUREN CO., LTD.

Inventor： Akira TERAJIMA ,  Kazuhiro KAWASAKI ,  Fumiaki IKUTA ,  Yasuyuki KOYATA ,  Yoshitaka MISAKA

IPC: C21D1/18 ,  C22C38/00 ,  C21D6/00 ,  B23K11/25 ,  B23K11/24 ,  C21D9/50 ,  B23K11/11 ,  C22C38/02 ,  C22C38/04

CPC classification number: C21D1/18 ,  B23K11/115 ,  B23K11/24 ,  B23K11/25 ,  B23K2101/18 ,  B23K2103/04 ,  C21D6/005 ,  C21D6/008 ,  C21D9/50 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04

Abstract: Object of the present invention is to provide a welding method prevented the fracture at the spot welding zone by recovering the strength of a spot welding zone, namely, the ductility and the toughness in the spot welding zone, and a weld structure manufactured by the method. In the welding method, a spot welding zone provided with a weld nugget is formed by conducting spot welding on the heat treated steel sheets in a stack; the spot welding zone is tempering treated by the high-frequency electrical current application to make the weld nugget have a hardness of 150% or less of the hardness of the heat treated steel sheets, and the heat affected zone surrounding the weld nugget is made to have a hardness of 30% to 90% of the hardness at the weld nugget before the tempering treatment by the high-frequency electrical current application.

公开(公告)号：US20180304343A1

公开(公告)日：2018-10-25

申请号：US15769869

申请日：2016-10-20

Applicant: NETUREN CO., LTD.

Inventor： Yoshitaka KUWAHARA ,  Fumiaki IKUTA ,  Takashi IKEDA ,  Kazuki MORI

IPC: B21J5/08 ,  B21K1/12 ,  B21K23/04 ,  B21K25/00

CPC classification number: B21J5/08 ,  B21K1/12 ,  B21K23/04 ,  B21K25/00

Abstract: A composite member includes a metal shaft member, and a fit member having an insertion hole and secured onto the shaft member inserted in the insertion hole. The shaft member includes a receiving portion contacting a first end surface of the fit member, a first radially enlarged portion adjacent to the receiving portion in an axial direction and tightly contacting an inner peripheral surface of the insertion hole, and a second radially enlarged portion adjacent to the first radially enlarged portion in the axial direction and tightly contacting a second end surface of the fit member opposite to the first end surface. The first and second radially enlarged portions are formed by applying a compressive load in the axial direction to the shaft member and an alternating load in a direction intersecting the axial direction to a portion of the shaft member inserted in the insertion hole.

公开(公告)号：US20170087615A1

公开(公告)日：2017-03-30

申请号：US15315925

申请日：2015-07-28

Applicant: NETUREN CO., LTD.

Inventor： Hironori OOYAMA ,  Fumiaki IKUTA

IPC: B21D22/02 ,  C21D1/40 ,  B21D37/16 ,  H05B3/00 ,  H05B1/02

CPC classification number: B21D22/022 ,  B21D37/16 ,  C21D1/40 ,  C21D9/48 ,  H05B1/0236 ,  H05B3/0004

Abstract: In a direct resistance heating method, a current is applied to a plate workpiece having a varying cross-sectional area to heat the workpiece such that a high-temperature heating region and a non-high-temperature heating region are provided side by side. The method includes a preparation step of arranging a pair of electrodes on the workpiece, and a heating step of moving a first electrode from one end of the high-temperature heating region while applying a current to the pair of electrodes, stopping the movement of the first electrode when the first electrode reaches the other end of the high-temperature heating region, and stopping the current from being applied to the pair of electrodes when a predetermined time elapses after stopping the first electrode. A press-molded product manufacturing method includes pressing the workpiece that has been heated by direct resistance heating method using a press die to perform hot press molding.

公开(公告)号：US20160076117A1

公开(公告)日：2016-03-17

申请号：US14848807

申请日：2015-09-09

Applicant: NETUREN CO., LTD.

Inventor： Akira TERAJIMA ,  Kazuhiro KAWASAKI ,  Fumiaki IKUTA ,  Yasuyuki KOYATA ,  Yoshitaka MISAKA

IPC: C21D1/18 ,  C22C38/00 ,  C22C38/04 ,  C22C38/02 ,  B23K11/11 ,  C21D6/00

CPC classification number: C21D1/18 ,  B23K11/115 ,  B23K11/24 ,  B23K11/25 ,  B23K2101/18 ,  B23K2103/04 ,  C21D6/005 ,  C21D6/008 ,  C21D9/50 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04

Abstract: Object of the present invention is to provide a welding method prevented the fracture at the spot welding zone by recovering the strength of a spot welding zone, namely, the ductility and the toughness in the spot welding zone, and a weld structure manufactured by the method. In the welding method, a spot welding zone provided with a weld nugget 13a is formed by conducting spot welding on the heat treated steel sheets in a stack; the spot welding zone is tempering treated by the high-frequency electrical current application to make the weld nugget have a hardness of 150% or less of the hardness of the heat treated steel sheets, and the heat affected zone surrounding the weld nugget is made to have a hardness of 30% to 90% of the hardness at the weld nugget before the tempering treatment by the high-frequency electrical current application.

Abstract translation: 本发明的目的是提供一种通过回收点焊区域的强度即点焊区域的延展性和韧性以及通过该方法制造的焊接结构来防止点焊区域的断裂的焊接方法 。 在焊接方法中，通过在堆叠处理的热处理钢板上进行点焊而形成设置有焊点13a的点焊区域， 点焊区域通过高频电流施加回火处理，使得焊点的硬度达到热处理钢板硬度的150％以下，焊接点周围的热影响区域为 在通过高频电流施加回火处理之前，在焊接熔核处具有硬度为30％至90％的硬度。