Patents by Inventor Towako MATSUI
Towako MATSUI 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).
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Patent number: 11319605Abstract: A heat treatment apparatus that thermally treats an annular workpiece formed of a steel material by inductively heating the workpiece includes a treatment tank in which the workpiece is set and thermally treated, a holding portion that holds the workpiece at a predetermined position, an induction heating coil that surrounds the workpiece to inductively heat the workpiece, and a cooling medium that cools surfaces of the workpiece during the induction heating of the workpiece.Type: GrantFiled: June 28, 2018Date of Patent: May 3, 2022Assignee: JTEKT CORPORATIONInventors: Wataru Yoshida, Towako Matsui, Katsuhiko Kizawa, Takashi Sada, Tsuyoshi Mikami
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Patent number: 10538821Abstract: A heat treatment apparatus that thermally treats an annular workpiece formed of a steel material by inductively heating the workpiece includes a treatment tank in which the workpiece is set and thermally treated, a holding portion that holds the workpiece at a predetermined position, an induction heating coil that surrounds the workpiece to inductively heat the workpiece, and a cooling medium that cools surfaces of the workpiece during the induction heating of the workpiece.Type: GrantFiled: October 6, 2015Date of Patent: January 21, 2020Assignee: JTEKT CORPORATIONInventors: Wataru Yoshida, Towako Matsui, Katsuhiko Kizawa, Takashi Sada, Tsuyoshi Mikami
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Patent number: 10190185Abstract: A hardening method for an annular workpiece made of metal includes a heating process that heats the annular workpiece to a hardening temperature; an analyzing process that obtains a diameter of the annular workpiece heated to the hardening temperature, and divides the heated annular workpiece into at least a small diameter portion and a large diameter portion based on the obtained diameter; and a cooling process that injects cooling liquid under an injection condition toward the annular workpiece that has been divided into at least the large diameter portion and the small diameter portion in the analyzing process such that a dimensional difference between the large diameter portion and the small diameter portion decreases, the injection condition for the large diameter portion being different from the injection condition for the small diameter portion.Type: GrantFiled: August 12, 2016Date of Patent: January 29, 2019Assignee: JTEKT CORPORATIONInventors: Towako Matsui, Tsuyoshi Mikami, Katsuhiko Kizawa
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Publication number: 20180305779Abstract: A heat treatment apparatus that thermally treats an annular workpiece formed of a steel material by inductively heating the workpiece includes a treatment tank in which the workpiece is set and thermally treated, a holding portion that holds the workpiece at a predetermined position, an induction heating coil that surrounds the workpiece to inductively heat the workpiece, and a cooling medium that cools surfaces of the workpiece during the induction heating of the workpiece.Type: ApplicationFiled: June 28, 2018Publication date: October 25, 2018Applicant: JTEKT CORPORATIONInventors: Wataru YOSHIDA, Towako MATSUI, Katsuhiko KIZAWA, Takashi SADA, Tsuyoshi MIKAMI
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Patent number: 9709099Abstract: A bearing ring formed of quenched and tempered high carbon chromium bearing steel, including an inner layer portion formed of tempered martensite or sorbite and having a Vickers hardness of more than 490 HV and 710 HV or less, and a surface layer portion formed to enclose an entire periphery of the inner layer portion, formed of tempered martensite, and having a higher hardness than the inner layer portion.Type: GrantFiled: October 6, 2015Date of Patent: July 18, 2017Assignee: JTEKT CORPORATIONInventors: Wataru Yoshida, Towako Matsui, Katsuhiko Kizawa, Takashi Sada
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Publication number: 20170058374Abstract: A hardening method for an annular workpiece made of metal includes a heating process that heats the annular workpiece to a hardening temperature; an analyzing process that obtains a diameter of the annular workpiece heated to the hardening temperature, and divides the heated annular workpiece into at least a small diameter portion and a large diameter portion based on the obtained diameter; and a cooling process that injects cooling liquid under an injection condition toward the annular workpiece that has been divided into at least the large diameter portion and the small diameter portion in the analyzing process such that a dimensional difference between the large diameter portion and the small diameter portion decreases, the injection condition for the large diameter portion being different from the injection condition for the small diameter portion.Type: ApplicationFiled: August 12, 2016Publication date: March 2, 2017Applicant: JTEKT CORPORATIONInventors: Towako MATSUI, Tsuyoshi MIKAMI, Katsuhiko KIZAWA
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Publication number: 20160108486Abstract: A heat treatment apparatus that thermally treats an annular workpiece formed of a steel material by inductively heating the workpiece includes a treatment tank in which the workpiece is set and thermally treated, a holding portion that holds the workpiece at a predetermined position, an induction heating coil that surrounds the workpiece to inductively heat the workpiece, and a cooling medium that cools surfaces of the workpiece during the induction heating of the workpiece.Type: ApplicationFiled: October 6, 2015Publication date: April 21, 2016Inventors: Wataru YOSHIDA, Towako MATSUI, Katsuhiko KIZAWA, Takashi SADA, Tsuyoshi MIKAMI
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Publication number: 20160108961Abstract: A bearing ring formed of quenched and tempered high carbon chromium bearing steel, including an inner layer portion formed of tempered martensite or sorbite and having a Vickers hardness of more than 490 HV and 710 HV or less, and a surface layer portion formed to enclose an entire periphery of the inner layer portion, formed of tempered martensite, and having a higher hardness than the inner layer portion.Type: ApplicationFiled: October 6, 2015Publication date: April 21, 2016Inventors: Wataru YOSHIDA, Towako MATSUI, Katsuhiko KIZAWA, Takashi SADA
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Patent number: 8640341Abstract: A method of producing a rolling sliding member, wherein, after a work for a rolling sliding member, which is made of a bearing steel and formed in a predetermined shape, is quenched, a heating start temperature is set to be 10 to 100° C., a heating finish temperature is set to be 220 to 350° C., a time between the heating finish time and the heating start time is set to be a heating time, the quenched work for the rolling sliding member is heated so that a rate of temperature increase indicated by the following formula becomes 7 to 35° C./s rate of temperature increase=(heating finish temperature?heating start temperature)/heating time, the work is tempered by being cooled without being maintained at a heating finish temperature from the heating finish time.Type: GrantFiled: August 10, 2010Date of Patent: February 4, 2014Assignee: JTEKT CorporationInventors: Towako Matsui, Katsuhiko Kizawa
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Publication number: 20110030219Abstract: A method of producing a rolling sliding member, wherein, after a work for a rolling sliding member, which is made of a bearing steel and formed in a predetermined shape, is quenched, a heating start temperature is set to be 10 to 100° C., a heating finish temperature is set to be 220 to 350° C., a time between the heating finish time and the heating start time is set to be a heating time, the quenched work for the rolling sliding member is heated so that a rate of temperature increase indicated by the following formula becomes 7 to 35° C./s rate of temperature increase=(heating finish temperature?heating start temperature)/heating time, the work is tempered by being cooled without being maintained at a heating finish temperature from the heating finish time.Type: ApplicationFiled: August 10, 2010Publication date: February 10, 2011Applicant: JTEKT CorporationInventors: Towako MATSUI, Katsuhiko KIZAWA