Patents by Inventor Yusaku TAKAGAWA

Yusaku TAKAGAWA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10737317
    Abstract: A core molding method for molding a core having a twisted shape by use of a core mold includes a curing step and a mold extracting step. In the curing step, after the core mold is disposed along a vertical direction within a frame whose top is open, a self-hardening sand formed of a kneaded mixture of a sand, a resin and a curing agent is charged into the frame from the top of the frame, and then cured. In the mold extracting step, the core mold is extracted in the vertical direction from the core formed of the cured self-hardening sand while rotating the core mold and the frame relatively to each other around an axis of the core mold.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: August 11, 2020
    Assignee: Kobe Steel, Ltd.
    Inventors: Kazuyuki Tsutsumi, Yusaku Takagawa
  • Patent number: 10589345
    Abstract: A mold molding method includes a binder reaction amount calculation step of calculating a reaction amount ?C(?, ti) [wt %] (i=1, 2) of a binder, a specimen room temperature compressive strength calculation step of calculating room temperature compressive strength ?c(?, t) [MPa] of a specimen, a mold room temperature compressive strength prediction step of predicting room temperature compressive strength ?ca(?, t) of the mold in advance, and a mold room temperature compressive strength extraction step of extracting room temperature compressive strength ?ce(?, t) of the mold. When the mold is actually molded, the model is removed just after elapse of the time t1, as one of the molding condition parameters which satisfies the room temperature compressive strength ?ce(?, t).
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: March 17, 2020
    Assignee: Kobe Steel, Ltd.
    Inventors: Yusaku Takagawa, Kazuyuki Tsutsumi
  • Publication number: 20190224743
    Abstract: A mold molding method includes a binder reaction amount calculation step of calculating a reaction amount ?C(?, ti) [wt %] (i=1, 2) of a binder, a specimen room temperature compressive strength calculation step of calculating room temperature compressive strength ?c(?, t) [MPa] of a specimen, a mold room temperature compressive strength prediction step of predicting room temperature compressive strength ?ca(?, t) of the mold in advance, and a mold room temperature compressive strength extraction step of extracting room temperature compressive strength ?ce(?, t) of the mold. When the mold is actually molded, the model is removed just after elapse of the time t1, as one of the molding condition parameters which satisfies the room temperature compressive strength ?ce(?, t).
    Type: Application
    Filed: September 1, 2017
    Publication date: July 25, 2019
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Yusaku TAKAGAWA, Kazuyuki TSUTSUMI
  • Publication number: 20180361468
    Abstract: A core molding method for molding a core having a twisted shape by use of a core mold includes a curing step and a mold extracting step. In the curing step, after the core mold is disposed along a vertical direction within a frame whose top is open, a self-hardening sand formed of a kneaded mixture of a sand, a resin and a curing agent is charged into the frame from the top of the frame, and then cured. In the mold extracting step, the core mold is extracted in the vertical direction from the core formed of the cured self-hardening sand while rotating the core mold and the frame relatively to each other around an axis of the core mold.
    Type: Application
    Filed: December 5, 2016
    Publication date: December 20, 2018
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Kazuyuki TSUTSUMI, Yusaku TAKAGAWA
  • Patent number: 10016807
    Abstract: When a core die is being removed from a core while being rotated around its axis, the hardening time of self-hardening sand, the frictional forces generated between the core and the core die during die removal, and the strength of the core during die removal are optimized.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: July 10, 2018
    Assignee: Kobe Steel, Ltd.
    Inventors: Kazuyuki Tsutsumi, Yusaku Takagawa
  • Patent number: 9862022
    Abstract: Provided is a casting method using lost foam capable of forming a small highly-finished hole with a diameter of 18 mm or less and a length of 50 mm or more by casting. A casting method using lost foam of the present embodiment includes the steps of embedding, in foundry sand, a casting pattern formed by applying a mold wash with a thickness of 1 mm or more to a surface of the foam pattern, the foam pattern having a hole with a diameter of D (mm); replacing the foam pattern with molten metal by pouring the molten metal into the casting pattern and losing the foam pattern; and forming a casting having a small hole with a diameter of 18 mm or less and a length of 50 mm or more by cooling the molten metal, and the method satisfies the following formulas (0) and (1): 2<D?19.7??Formula (0) ?c??0.36+140/D2??Formula (1) where ?c (MPa) is transverse rupture strength (bending strength) of the mold wash that is heated to decompose resin constituting the mold wash and then returned to room temperature.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: January 9, 2018
    Assignee: Kobe Steel, Ltd
    Inventors: Kazuyuki Tsutsumi, Yusaku Takagawa
  • Publication number: 20170239711
    Abstract: Provided is a casting method using lost foam capable of forming a small highly-finished hole with a diameter of 18 mm or less and a length of 50 mm or more by casting. A casting method using lost foam of the present embodiment includes the steps of embedding, in foundry sand, a casting pattern formed by applying a mold wash with a thickness of 1 mm or more to a surface of the foam pattern, the foam pattern having a hole with a diameter of D (mm); replacing the foam pattern with molten metal by pouring the molten metal into the casting pattern and losing the foam pattern; and forming a casting having a small hole with a diameter of 18 mm or less and a length of 50 mm or more by cooling the molten metal, and the method satisfies the following formulas (0) and (1): 2<D?19.7 ??Formula (0) ?c??0.36+140/D2 ??Formula (1) where ?c (MPa) is transverse rupture strength (bending strength) of the mold wash that is heated to decompose resin constituting the mold wash and then returned to room temperature.
    Type: Application
    Filed: August 5, 2015
    Publication date: August 24, 2017
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Kazuyuki TSUTSUMI, Yusaku TAKAGAWA
  • Publication number: 20160303645
    Abstract: When a core die is being removed from a core while being rotated around its axis, the hardening time of self-hardening sand, the frictional forces generated between the core and the core die during die removal, and the strength of the core during die removal are optimized.
    Type: Application
    Filed: November 25, 2014
    Publication date: October 20, 2016
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Kazuyuki TSUTSUMI, Yusaku TAKAGAWA