Patents Assigned to Mitsui High-tec Inc.
  • METHOD FOR MANUFACTURING LAMINATED IRON CORE AND SHAPE OF SCRAP PRODUCED THEREBY
    Publication number: 20140317908
    Abstract: A method for manufacturing a laminated iron core by press punching a thin strip material to manufacture a motor core, comprising, before punching out a scrap 10 of an iron core piece 11 for the motor core, forming a plurality of partition holes 15 in the scrap 10 to divide the scrap 10 into areas 20, each of the partition holes 15 being connected at one end thereof with a peripheral portion 14 of the scrap 10 through a first connecting portion 17. The method further comprises forming a central hole 12, which is connected with the partition holes 15 through second connecting portions 18, at a central portion of the scrap 10. Accordingly, provided are the method for manufacturing a laminated iron core without causing scrap pulling when punching out and laminating the thin iron core pieces 11 and the shape of the scraps formed thereby.
    Type: Application
    Filed: November 13, 2012
    Publication date: October 30, 2014
    Applicant: MITSUI HIGH-TEC INC.
    Inventors: Kazuhiko Umeda, Masahiro Izumi
  • Method for producing rotor
    Patent number: 8869379
    Abstract: A method of producing a rotor includes crimping and stacking a plurality of core pieces through crimping connecting portions to form a rotor stacked core having a magnet-insertion hole and inserting a permanent-magnet pieces into the magnet-insertion hole. Further, the method also includes clamping the rotor stacked core between an upper die and a lower die, and filling a resin into the magnet-insertion hole from a resin reservoir pot which is formed in the upper die or the lower die. Also, the resin may be filled into the magnet-insertion hole while placing the crimping connecting portions at a center of the resin reservoir pot.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: October 28, 2014
    Assignee: Mitsui High-Tec, Inc.
    Inventors: Hirotoshi Mabu, Kohei Yoshida
  • ROTOR CORE AND METHOD OF MANUFACTURING THE SAME
    Publication number: 20140265718
    Abstract: A method of manufacturing a rotor core includes a first process of punching out punched holes 22, 23 forming outlines of keys 13, 14 in a thin metal strip 18, the holes 22, 23 including inside areas 25 located inside a shaft hole 12 and outside areas 26 continuous from the areas 25 and located outside the hole 12; a second process of punching out the hole 12 including recesses 35, 36 to avoid the keys 13, 14 and communicating with the holes 22, 23; and a third process of punching out an outline of a core sheet 11 having the hole 12 and laminating the sheets 11. Thereby, a shaft hole having keys is formed precisely, a thickness deviation of core sheets is eliminated, and a rotor core having homogeneous magnetism is provided.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: MITSUI-HIGH-TEC, INC.
    Inventors: Daisuke Komiya, Toshio Goto
  • METHOD FOR PRODUCING ROTOR LAMINATED CORE
    Publication number: 20140230236
    Abstract: There is provided a method for producing a rotor laminated core by laminating circular core pieces. The method determines a first blanking area, a second blanking area and a third blanking area in the magnetic steel board, wherein the first blanking area defines a shape of the core piece, the second blanking area defines a shape of a magnet-insertion hole, and the third blanking area defines a shape of an arbitrary part in the magnetic steel board. The method also forms a temporary aperture in the second blanking area, forms a thinning part which extends from the temporary aperture to the third blanking area, and blanks the first blanking area, the second blanking area and the third blanking area, thereby producing each circular core piece including the thinning part and magnet-insertion holes formed in a circumferential direction.
    Type: Application
    Filed: February 12, 2014
    Publication date: August 21, 2014
    Applicant: MITSUI HIGH-TEC , INC.
    Inventors: Akihiro HASHIMOTO, Takahiro SHIMIZU
  • MANUFACTURING METHOD FOR LAMINATED CORE AND MANUFACTURING APPARATUS THEREFOR
    Publication number: 20140231003
    Abstract: A laminated core manufacturing method for performing rotational lamination by conveying a band-shaped material to be stamped 10 to a die apparatus to successively perform presswork, stamping out and dropping manufactured core pieces 20 into a blanking die 21 and rotating the blanking die 21 by a predetermined angle, in which a positioning mechanism for the blanking die 21, which has rotational lamination guide pins and rotational lamination guide holes 23-30, is disposed inward from both ends in a width direction of the band-shaped material to be stamped 10 and temporary holes 13-16 for the rotational lamination guide pins to be inserted are provided in the band-shaped material to be stamped 10. The structure allows downsizing of the die apparatus.
    Type: Application
    Filed: October 1, 2012
    Publication date: August 21, 2014
    Applicant: MITSUI HIGH-TEC, INC.
    Inventors: Yukinori Oba, Hirokazu Arakawa
  • METHOD OF MANUFACTURING LAMINATED ROTOR CORE
    Publication number: 20140196276
    Abstract: There is provided a method of manufacturing a laminated rotor core, including: a mounting step of placing a core body on a carrier tray, the core body having a plurality of magnet insertion holes provided around the shaft hole, the carrier tray having a mount plate and a columnar guide member standing on a front surface of the mount plate 41, the placement of the core body being carried out by fitting the guide member into the shaft hole; an inserting step of inserting permanent magnets respectively in the magnet insertion holes; an injecting step of injecting a liquefied resin material in each of the magnet insertion holes; and a first preheating step of heating the core body before the mounting step, wherein the inserting step and the injecting step are carried out in a state in which the core body is placed on the carrier tray.
    Type: Application
    Filed: January 10, 2014
    Publication date: July 17, 2014
    Applicant: MITSUI HIGH-TEC, INC.
    Inventors: Akira Nagai, Go Kato, Mei Ogata
  • LEAD FRAME
    Publication number: 20140196938
    Abstract: A lead frame includes a plurality of unit lead frames arranged in a matrix. Leads of adjacent ones of the unit lead frames are connected via a connecting bar, in which a longitudinal connecting bar and a transverse connecting bar are crossed at a crossing part. The lead frame further includes a dicing part including the connecting bar and a part of the leads, to be cut along a dicing line, a half-etching part formed along the dicing part, and being smaller in width than the dicing part, and a strength retention part formed in the half-etching part and extended from the crossing part of the connecting bar at least to an end lead located closest to the crossing part among the leads of the unit lead frame adjacent to the crossing part.
    Type: Application
    Filed: January 2, 2014
    Publication date: July 17, 2014
    Applicant: MITSUI HIGH-TEC , INC.
    Inventor: Takahiro ISHIBASHI
  • LEAD FRAME
    Publication number: 20140192506
    Abstract: A lead frame includes adjacent die pads which lie adjacent to each other; grounding leads extended from the adjacent die pads; a connecting bar by which the grounding leads extended from the adjacent die pads are interconnected. The grounding leads and the connecting bar are formed to be thinner at one surface than a maximum thickness of leads of the lead frame, the grounding leads extended from the adjacent die pads are aligned on a common axis while providing the connecting bar between the grounding leads, and a support projection is provided at the one surface on the connecting bar in the common axis.
    Type: Application
    Filed: January 2, 2014
    Publication date: July 10, 2014
    Applicant: MITSUI HIGH-TEC , INC.
    Inventor: Takahiro ISHIBASHI
  • LEAD FRAME, METHOD FOR MANUFACTURING LEAD FRAME AND SEMICONDUCTOR DEVICE USING SAME
    Publication number: 20140159221
    Abstract: Provided is a lead frame by which a die pad can be easily exposed when the lead frame is used for a semiconductor device. The lead frame has a die pad with an upper surface on which a semiconductor element is mounted. The lead frame is used for the semiconductor device with the exposed surface of the die pad being exposed from a sealing resin. A downwardly-projecting first metal burr is formed along the peripheral portion of the exposed surface of the die pad and heads of the first metal burr are flat.
    Type: Application
    Filed: July 3, 2012
    Publication date: June 12, 2014
    Applicant: MITSUI HIGH-TEC , INC.
    Inventors: Koji Shimizu, Masanori Mitsui
  • METHOD OF RESIN SEALING PERMANENT MAGNETS IN LAMINATED ROTOR CORE
    Publication number: 20140151926
    Abstract: A laminated rotor core (36) wherein permanent magnets (47) are inserted in respective magnet insertion holes (46) is disposed between and pressed by an upper die (37) and a lower die (29). The upper die (37) has resin reservoir pots (50) provided above the laminated rotor core (36) and at positions corresponding to the respective magnet insertion holes (46). Raw resin material put in the resin reservoir pots (50) is heated by the upper die (37). Subsequently, the resin material in a liquefied state is ejected from the resin reservoir pots (50) by plungers (52) that are inserted and moves vertically in the resin reservoir pots (50) and is directly filled in the magnet insertion holes (46). Consequently, the respective magnet insertion holes (46) are filled with the resin material more evenly and highly reliable products can be supplied at low cost.
    Type: Application
    Filed: February 4, 2014
    Publication date: June 5, 2014
    Applicant: MITSUI HIGH-TEC, INC.
    Inventors: Satoshi Matsubayashi, Hirotoshi Mabu, Katsumi Amano, Atsushi Shiraishi
  • Method of resin sealing permanent magnets in laminated rotor core
    Patent number: 8728375
    Abstract: A laminated rotor core (36) wherein permanent magnets (47) are inserted in respective magnet insertion holes (46) is disposed between and pressed by an upper die (37) and a lower die (29). The upper die (37) has resin reservoir pots (50) provided above the laminated rotor core (36) and at positions corresponding to the respective magnet insertion holes (46). Raw resin material put in the resin reservoir pots (50) is heated by the upper die (37). Subsequently, the resin material in a liquefied state is ejected from the resin reservoir pots (50) by plungers (52) that are inserted and moves vertically in the resin reservoir pots (50) and is directly filled in the magnet insertion holes (46). Consequently, the respective magnet insertion holes (46) are filled with the resin material more evenly and highly reliable products can be supplied at low cost.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: May 20, 2014
    Assignee: Mitsui High-Tec, Inc.
    Inventors: Satoshi Matsubayashi, Hirotoshi Mabu, Katsumi Amano, Atsushi Shiraishi
  • METHOD FOR MANUFACTURING LAMINATED IRON CORE
    Publication number: 20140131919
    Abstract: A method for manufacturing a laminated iron core is provided. A laminated iron core body including a permanent magnet inserted into a magnet-insert hole is arranged between a molding die and a holding die. A cull plate is arranged between the molding die and the laminated iron core body. The cull plate has a groove shaped runner directed toward the magnet-insert hole from a resin reservoir and provided with a gate hole communicating with the magnet-insert hole, and a through hole which vertically passes through the cull plate is formed in the runner of the cull plate at a different position from a position of the gate hole. After the magnet-insert hole is filled with the mold resin a resin residue remaining in the cull plate is pushed off and removed from the gate hole and the through hole.
    Type: Application
    Filed: November 5, 2013
    Publication date: May 15, 2014
    Applicant: MITSUI HIGH-TEC , INC.
    Inventor: Hirotoshi MABU
  • METHOD FOR MANUFACTURING LAMINATED CORE
    Publication number: 20140124980
    Abstract: A method for manufacturing a laminated core, in which while a laminated core body 10 formed by caulking and with permanent magnets 20 inserted in a plurality of magnet insertion holes 17, 18 is held between a resin injection die 23 and a receiving die 22 opposed to each other, resin is injected into the magnet insertion holes 17, 18 from resin reservoir portions provided to the resin injection die 23 to fix the permanent magnets 20, the method comprising: at a time of resin injection, pressing a flat press surface 24 of the resin injection die 23 against caulking portions 13 protruding from a surface of the laminated core body 10 to apply pressure thereto, thereby allowing the surface of the laminated core body 10 whereon the caulking portions 13 are formed to be pressed against the flat press surface 24 so as to prevent resin leakage.
    Type: Application
    Filed: November 5, 2013
    Publication date: May 8, 2014
    Applicant: MITSUI HIGH-TEC, INC.
    Inventors: Akira Nagai, Jin Oda
  • METHOD OF RESIN-SEALING LAMINATED CORE
    Publication number: 20140124978
    Abstract: A method of resin-sealing for a laminated core includes the steps of: holding by sandwiching a core body 11 between a resin injection mold 20 and a supporting mold 21; extruding a molten resin using a plunger 37 from a resin reservoir pot 24 provided in the resin injection mold 20; and resin-sealing the permanent magnets 18 in the magnet insertion holes 16 and 17, wherein a material of the resin reservoir pot 24 of the resin injection mold 20 and a region through which the resin passes from the resin reservoir pot 24 is a superhard material, and wear in the resin injection mold 20 due to a flow of the resin is reduced. With this, a gap between the resin reservoir pot 24 and the resin injection mold 20 due to a difference in thermal expansion is less easily produced.
    Type: Application
    Filed: October 22, 2013
    Publication date: May 8, 2014
    Applicant: MITSUI HIGH-TEC, INC.
    Inventor: Hirotoshi Mabu
  • METHOD OF MANUFACTURING LAMINATED CORE HAVING PERMANENT MAGNETS SEALED WITH RESIN
    Publication number: 20140109391
    Abstract: A method of manufacturing a laminated core, having a laminated core body 10a formed by laminating plural core sheets 11 and having magnet insertion holes 13, 14 with openings 17, 18 opening to a inner space 15 or an external side, inserting and resin-sealing permanent magnets 20, 21 in the magnet insertion holes 13, 14, with the openings 17, 18 blocked by a blocking member 23, the method including: temporarily connecting blocking member pieces 32 to be the blocking member 23 in each of the core sheets 11 and removing the blocking member 23 with the laminated core body 10a resin-sealed. By this, without a special blocking member, the permanent magnets 20, 21 are resin-sealed while the magnet insertion holes 13, 14, parts of which have the openings 17, 18, are blocked.
    Type: Application
    Filed: May 7, 2012
    Publication date: April 24, 2014
    Applicant: MITSUI HIGH-TEC, INC.
    Inventors: Satoshi Matsubayashi, Akira Nagai, Go Kato
  • METHOD OF RESIN-SEALING LAMINATED CORE
    Publication number: 20140103574
    Abstract: A method of resin-sealing a laminated core, including inserting permanent magnets 24 into magnet insertion holes 18 of a core body 15, pressing the body 15 with upper and lower dies 11, 12, and injecting resin 29 to the holes 18 from a resin reservoir 17 of the die 11 or 12 via a runner 19 in a removable cull plate 14, one end of the runner 19 having plural resin injection holes 33, 34 per hole 18. The resin 29 presses the magnets 24 in the holes 18 to one sides in a radial direction of the holes 18. Thereby, resin-sealing is performed using the plate 14 and the magnets 24 are arranged in radially outward or inward sides even with narrow gaps between the magnets 24 and the holes 18 or without resin injection holes in centers in a width direction of the holes 18.
    Type: Application
    Filed: October 9, 2013
    Publication date: April 17, 2014
    Applicant: MITSUI HIGH-TEC, INC.
    Inventor: Hisatomo Ishimatsu
  • Lead frame, semiconductor apparatus using this lead frame, intermediate product thereof and manufacturing method thereof
    Patent number: 8680657
    Abstract: In a lead frame for a semiconductor apparatus 10, including plural terminals 13, one portions of the terminals 13 being sealed with a resin, a resin-sealed portion 16 of the terminal 13 has a polygonal columnar shape that is pentagonal or more or a deformed columnar shape having at least one notch or groove part extending vertically in a periphery. This resin-sealed portion 16 is formed by etching processing or press processing, and an exposed portion 18 of lower half of the terminal 13 is formed by the etching processing.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: March 25, 2014
    Assignee: Mitsui High-Tec, Inc.
    Inventors: Koji Shimizu, Hiroaki Yatsukawa
  • Method of manufacturing laminated rotor core
    Patent number: 8578592
    Abstract: A method of manufacturing a laminated rotor core, includes a first process of placing segment dummy plates between an iron core and a die, each of each segment dummy plates covering one or more of plural magnet insertion portions and including a resin injection hole communicating to the one or more of the magnet insertion portions; a second process of injecting a resin from resin reservoir parts formed in any one of an upper die and a lower die holding the iron core through the resin injection hole of each segment dummy plate to the corresponding one or more of the magnet insertion portions; and a third process of detaching the segment dummy plates together with excess resin after the resin injected to the one or more of the magnet insertion portions is cured.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: November 12, 2013
    Assignee: Mitsui High-Tec, Inc.
    Inventors: Akira Nagai, Mei Arazoe, Go Kato
  • METHOD OF MANUFACTURING LAMINATED STATOR CORE AND LAMINATED STATOR CORE MANUFACTURED BY THE METHOD
    Publication number: 20130293060
    Abstract: A method of manufacturing a laminated stator core and a laminated stator core manufactured by the method, the method capable of forming a recess 21 over one or both of (a) a lateral portion of an ear piece C of the stator core sheet A to be formed adjacent to the stator core sheet B and (b) a peripheral portion of the annular yoke piece D continuing to the lateral portion, the peripheral portion beside the ear piece C; fitting one ear piece E of the stator core sheet B with a gap in the recess 21; and thereby improving a material yield when the stator core sheets 13 are formed from the strip material 14.
    Type: Application
    Filed: February 2, 2012
    Publication date: November 7, 2013
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, MITSUI HIGH-TEC, INC.
    Inventors: Yusuke Hasuo, Shinya Sano, Eiji Yanagida
  • Profile grinding machine
    Patent number: RE45075
    Abstract: The profile grinding machine includes: a base; a work unit disposed on one side on the base and including a work table for gripping a work; and a stone unit disposed on the other side on the base and including a stone rotating mechanism for holding and rotating a grinding stone on its axis. The work unit includes first to third moving device for supporting and moving the work table in an X-direction and a Y-direction perpendicular to each other in a horizontal plane, and in a Z-direction normal to the horizontal plane, respectively. The stone unit includes turning mechanism for turning the grinding stone about a vertical axis substantially coinciding with the leading end portion of the grinding stone.
    Type: Grant
    Filed: October 23, 2012
    Date of Patent: August 12, 2014
    Assignee: Mitsui High-Tec, Inc.
    Inventors: Tadao Hirose, Hiroshi Iwakiri, Akikazu Higuchi, Atsushi Nagata