Patents by Inventor Kazumichi Nakatani
Kazumichi Nakatani 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: 11901117Abstract: A method for manufacturing a powder magnetic core, the method including: forming a soft magnetic powder (SMP) layer by putting an SMP having a surface on which an insulating coating film is formed into a space surrounded by a lower punch and a die; forming a pressed powder by compressing the SMP layer in the die by the lower punch and an upper punch; and causing the pressed powder and the die to slide relative to each other and then removing the pressed powder from the die is provided. In forming the SMP layer, a different powder different from the SMP is put into the space before and after the SMP is put into the space and a different powder layer having a spring back rate higher than that of the SMP layer by 0.6-1.1% is formed on upper and lower sides of the SMP layer.Type: GrantFiled: June 10, 2021Date of Patent: February 13, 2024Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroto Nagaki, Kazumichi Nakatani, Kohei Ishii
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Publication number: 20220020531Abstract: A method for manufacturing a powder magnetic core, the method including: forming a soft magnetic powder (SMP) layer by putting an SMP having a surface on which an insulating coating film is formed into a space surrounded by a lower punch and a die; forming a pressed powder by compressing the SMP layer in the die by the lower punch and an upper punch; and causing the pressed powder and the die to slide relative to each other and then removing the pressed powder from the die is provided. In forming the SMP layer, a different powder different from the SMP is put into the space before and after the SMP is put into the space and a different powder layer having a spring back rate higher than that of the SMP layer by 0.6-1.1% is formed on upper and lower sides of the SMP layer.Type: ApplicationFiled: June 10, 2021Publication date: January 20, 2022Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroto NAGAKI, Kazumichi NAKATANI, Kohei ISHII
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Patent number: 10532404Abstract: In molding a compact having portions of an equal thickness on opposite sides of a through-hole, an advancing speed of a holder holding a powder material is adjusted before the holder is advanced and retracted over a die cavity of a die. Specifically, a first preparation of determining in advance a relation between the advancing speed of the holder and a packing density of the powder material packed in the die cavity at each of the portions to be of an equal thickness of the compact on opposite sides of the through-hole is made; and, based on the relation determined in the first preparation, the advancing speed of the holder is adjusted to a speed at which the packing density becomes uniform. Thus, the packing density of the powder material packed in the die cavity can be uniformized, so that the dimensional accuracy of the molded compact can be improved.Type: GrantFiled: March 8, 2017Date of Patent: January 14, 2020Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yoshiyuki Sanada, Kazumichi Nakatani
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Patent number: 9815114Abstract: A powder for molding is a mixture of first constituent particles, which are made up of first metal base particles, and second constituent particles, which are made up of second metal base particles. A first lubricant concentration that is a mass proportion of a first internal lubricant adhered to the surface of the first metal base particles with respect to the total of the first constituent particles, is greater than a second lubricant concentration that is a mass proportion of a second internal lubricant that is adhered to the surface of the second metal base particles with respect to the total of the second constituent particles.Type: GrantFiled: March 11, 2014Date of Patent: November 14, 2017Assignee: Toyota Jidosha Kabushiki KaishaInventors: Mikio Kondoh, Nobuhiko Matsumoto, Toshitake Miyake, Kazumichi Nakatani
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Patent number: 9802252Abstract: There is provided a method for controlling a powder compacting apparatus including: a die having a hollow; an upper punch and a floating lower punch; a first actuator that pushes down the upper punch; a second actuator that controls a floating load of the floating lower punch; and a stopper that defines a pressurization stop position of the floating lower punch. The powder compacting apparatus is configured such that the first actuator is operated to push down the upper punch to pressurize powder charged into the cavity, and the second actuator is controlled to pressurize the powder such that a load acting on the powder during pressurization becomes a prescribed floating load required to compact the powder. The method includes reducing the floating load in a stepwise manner after completion of the pressurization.Type: GrantFiled: September 22, 2016Date of Patent: October 31, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Kazumichi Nakatani
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Publication number: 20170259335Abstract: In molding a compact having portions of an equal thickness on opposite sides of a through-hole, an advancing speed of a holder holding a powder material is adjusted before the holder is advanced and retracted over a die cavity of a die. Specifically, a first preparation of determining in advance a relation between the advancing speed of the holder and a packing density of the powder material packed in the die cavity at each of the portions to be of an equal thickness of the compact on opposite sides of the through-hole is made; and, based on the relation determined in the first preparation, the advancing speed of the holder is adjusted to a speed at which the packing density becomes uniform. Thus, the packing density of the powder material packed in the die cavity can be uniformized, so that the dimensional accuracy of the molded compact can be improved.Type: ApplicationFiled: March 8, 2017Publication date: September 14, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Yoshiyuki SANADA, Kazumichi NAKATANI
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Publication number: 20170095859Abstract: There is provided a method for controlling a powder compacting apparatus including: a die having a hollow; an upper punch and a floating lower punch; a first actuator that pushes down the upper punch; a second actuator that controls a floating load of the floating lower punch; and a stopper that defines a pressurization stop position of the floating lower punch. The powder compacting apparatus is configured such that the first actuator is operated to push down the upper punch to pressurize powder charged into the cavity, and the second actuator is controlled to pressurize the powder such that a load acting on the powder during pressurization becomes a prescribed floating load required to compact the powder. The method includes reducing the floating load in a stepwise manner after completion of the pressurization.Type: ApplicationFiled: September 22, 2016Publication date: April 6, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Kazumichi NAKATANI
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Publication number: 20170095860Abstract: There is provided a method for controlling a powder compacting apparatus including: a die having a hollow; an upper punch; a floating lower punch; a first actuator that pushes down the upper punch; a second actuator that controls a floating load of the floating lower punch; and a stopper that defines a pressurization stop position of the floating lower punch. The powder compacting apparatus is configured such that the first actuator is operated to push down the upper punch to pressurize powder charged into the cavity, and the second actuator is controlled to pressurize the powder such that a load acting on the powder during pressurization becomes a prescribed floating load required to compact the powder. The method includes causing the first actuator to reduce a descending speed of the upper punch when the floating lower punch reaches a position at a prescribed distance from the stopper.Type: ApplicationFiled: September 22, 2016Publication date: April 6, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Kazumichi NAKATANI
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Publication number: 20140271327Abstract: A powder for molding is a mixture of first constituent particles, which are made up of first metal base particles, and second constituent particles, which are made up of second metal base particles. A first lubricant concentration that is a mass proportion of a first internal lubricant adhered to the surface of the first metal base particles with respect to the total of the first constituent particles, is greater than a second lubricant concentration that is a mass proportion of a second internal lubricant that is adhered to the surface of the second metal base particles with respect to the total of the second constituent particles.Type: ApplicationFiled: March 11, 2014Publication date: September 18, 2014Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Mikio Kondoh, Nobuhiko Matsumoto, Toshitake Miyake, Kazumichi Nakatani