Patents Assigned to Mitsubishi Heavy Industries Plastic Technology Co., Ltd.
  • Patent number: 10946570
    Abstract: This injection molding method uses an injection molding machine for two-material molding, which comprises a first mold part that is provided with a cavity and a second mold part that is provided with a cavity and is arranged in tandem with the first mold part. This injection molding method comprises: a first molding step wherein a material is injected into the cavity of the first mold part and the material in the cavity is compressed; and a second molding step wherein a material is injected into the cavity of the second mold part. A pressure, which is generated in the second mold part by injecting the material into the cavity in the second molding step, acts on the first mold part, and a compressive force is applied to the material in the cavity in the first molding step.
    Type: Grant
    Filed: June 6, 2014
    Date of Patent: March 16, 2021
    Assignee: MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO., LTD.
    Inventors: Toshihiko Kariya, Yasuo Okochi
  • Patent number: 9669573
    Abstract: The injection molding apparatus of the present invention includes: a heating cylinder; a screw that is provided rotatably in an inner portion of the heating cylinder; a resin feed hopper that feeds a resin pellet; and a fiber feed device that is provided ahead of the resin feed hopper and feeds reinforcing fibers into the heating cylinder. The screw includes a first stage that is located on a rear side, and in which the resin pellet is melted, and a second stage that is located on a front side, and in which the melted resin pellet and the reinforcing fibers are mixed, and a lead of a second flight provided in the second stage is larger than a lead of a first flight provided in the first stage.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: June 6, 2017
    Assignee: MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO., LTD.
    Inventors: Toshihiko Kariya, Naoki Toda, Munehiro Nobuta, Kiyoshi Kinoshita, Takeshi Yamaguchi, Kosuke Ikeda, Yuji Suzumura, Hitoshi Onuma, Ryoji Okabe, Masanori Takahashi
  • Publication number: 20170050357
    Abstract: This injection molding method uses an injection molding machine for two-material molding, which comprises a first mold part that is provided with a cavity and a second mold part that is provided with a cavity and is arranged in tandem with the first mold part. This injection molding method comprises: a first molding step wherein a material is injected into the cavity of the first mold part and the material in the cavity is compressed; and a second molding step wherein a material is injected into the cavity of the second mold part. A pressure, which is generated in the second mold part by injecting the material into the cavity in the second molding step, acts on the first mold part, and a compressive force is applied to the material in the cavity in the first molding step.
    Type: Application
    Filed: June 6, 2014
    Publication date: February 23, 2017
    Applicant: Mitsubishi Heavy Industries Plastic Technology Co., Ltd.
    Inventors: Toshihiko Kariya, Yasuo Okochi
  • Publication number: 20170001353
    Abstract: There is provided a screw of an injection molding machine that can eliminate uneven distribution of reinforcing fibers without giving an excessive shear force to the reinforcing fibers. A screw is provided inside a heating cylinder of an injection molding machine to which a resin pellet is fed on an upstream side in a conveyance direction of resin and to which reinforcing fibers are fed on a downstream side therein, and includes: a first stage at which the resin pellet which is fed is melted; and a second stage that continues to the first stage, and at which molten resin and the reinforcing fibers are mixed with each other. A second flight provided at the second stage includes: a large-diameter flight with a relatively large outer diameter; and a small-diameter flight with a relatively small outer diameter.
    Type: Application
    Filed: June 9, 2014
    Publication date: January 5, 2017
    Applicant: Mitsubishi Heavy Industries Plastic Technology Co., Ltd.
    Inventors: Toshihiko KARIYA, Munehiro NOBUTA, Naoki TODA, Kiyoshi KINOSHITA, Takeshi YAMAGUCHI
  • Patent number: 9475224
    Abstract: A hydraulic supply device of an injection molding machine is provided with: a first main hydraulic power source including a first main hydraulic pump having a variable capacity and driven by a first constant rotational speed motor, and a first main discharge pipe through which working oil flows; an auxiliary hydraulic power source including an auxiliary hydraulic pump driven by a servo motor and operated at a specific capacity, an auxiliary discharge pipe through which the working oil flows, and a check valve that regulates the inflow of working oil to the auxiliary hydraulic pump; a hydraulic control unit that controls the first main hydraulic power source and the auxiliary hydraulic power source; a junction pipe at which the first main discharge pipe and the auxiliary discharge pipe join; and a switching unit that switches the supply/non-supply of working oil for a hydraulic actuator.
    Type: Grant
    Filed: April 6, 2011
    Date of Patent: October 25, 2016
    Assignee: MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO., LTD.
    Inventors: Masaaki Ikarashi, Mamoru Kawasaki
  • Patent number: 9441643
    Abstract: A hydraulic oil storage device and an injection molding device are provided with a connection box that partitions a storage region of a sub-tank into a first region that includes a flow channel opening portion for a coupling tube and a second region other than the first region, in which the connection box is provided with an internal region communication portion that brings the first region and the second region into communication, and causes a pressure loss equal to the pressure loss of the coupling tube, or a pressure loss greater than that pressure loss, and a return tube is connected to the sub-tank so that the flow channel outlet faces the first region.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: September 13, 2016
    Assignees: MITSUBISHI HEAVY INDUSTRIES, LTD., MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO., LTD.
    Inventors: Masaaki Ikarashi, Mamoru Kawasaki, Yuichi Hosoi, Toshihiko Kariya, Yoshinao Komatsu
  • Patent number: 9254600
    Abstract: An injection foam molding machine of the invention includes: a movable mold platen; a fixed mold platen; a mold fastening hydraulic cylinder that is provided at each of four corners of both mold platens; a tie bar that is driven by the hydraulic cylinder to fasten the molds; two sets of mold opening and closing actuators that drive the movable mold platen to move close to or away from the fixed mold platen; two sets of dedicated core back devices; and a control device that controls the two sets of mold opening and closing actuators and the two sets of dedicated core back devices, wherein the control device includes a dedicated core back program that simultaneously controls the two sets of mold opening and closing actuators and the two sets of dedicated core back devices during a foaming core back operation of moving the movable mold platen away from the fixed mold platen.
    Type: Grant
    Filed: November 27, 2009
    Date of Patent: February 9, 2016
    Assignee: MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO., LTD.
    Inventors: Saburo Fujita, Takehiro Irie, Keijiro Sugiura, Toshihiko Kariya
  • Patent number: 9096008
    Abstract: A mold clamping device includes a fixed platen on which a fixed mold is disposed, a movable platen on which a movable mold that defines a cavity along with the fixed mold is disposed, a tie bar configured to resist a mold clamping force that is generated between the fixed platen and the movable platen, and a half nut opening and closing device configured to grip the tie bar, thereby locking the movable platen and the tie bar, in which the half nut opening and closing device includes half nuts configured to grip the tie bars, an actuator which is disposed on the movable platen and configured to move the half nuts back and forth with respect to the tie bars, and a clevis configured to connect the actuator to the half nuts so as to allow the actuator to swing with respect to the gripping member.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: August 4, 2015
    Assignee: MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO., LTD.
    Inventor: Naoki Kato
  • Patent number: 9085103
    Abstract: A plasticizing screw for injection molding according to the present invention is a plasticizing screw for injection molding that is installed in an injection molding machine which performs injection molding by plasticizing granular thermoplastic resin feedstock containing reinforcement fibers, and includes a shaft, a flight, and a mixer. The mixer is provided in plural stages in an axial direction, and the number of fins of the mixer of each stage increases toward a leading end side in the axial direction from a rear end side in the axial direction. Further, the protrusion height of each fin from the peripheral surface of the shaft is lower than the protrusion height of the flight from the peripheral surface of the shaft.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: July 21, 2015
    Assignee: MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO., LTD.
    Inventors: Toshihiko Kariya, Naoki Toda, Munehiro Nobuta
  • Patent number: 9011750
    Abstract: The injection molding device of the present invention is provided with a supply pipe which supplies a heat medium to a mold, a discharge pipe which discharges the heat medium from the mold, a mold temperature adjustor to which the supply pipe and the discharge pipe are connected to adjust the temperature of the mold, and a discharge rate adjusting unit which is provided with a variable flow control valve installed on the discharge pipe to adjust a flow rate of the heat medium, a discharge pipe variable flow control valve bypass pipe for bypassing the variable flow control valve and a discharge pipe bypass on-off valve installed on the bypass pipe to change a flow rate of the heat medium and which is installed at a position upstream from the mold temperature adjustor on the discharge pipe.
    Type: Grant
    Filed: April 21, 2010
    Date of Patent: April 21, 2015
    Assignee: Mitsubishi Heavy Industries Plastic Technology Co., Ltd.
    Inventors: Michitaka Hattori, Satoshi Imaeda, Toshihiko Kariya
  • Publication number: 20150044325
    Abstract: A mold clamping device includes a fixed platen on which a fixed mold is disposed, a movable platen on which a movable mold that defines a cavity along with the fixed mold is disposed, a tie bar configured to resist a mold clamping force that is generated between the fixed platen and the movable platen, and a half nut opening and closing device configured to grip the tie bar, thereby locking the movable platen and the tie bar, in which the half nut opening and closing device includes half nuts configured to grip the tie bars, an actuator which is disposed on the movable platen and configured to move the half nuts back and forth with respect to the tie bars, and a clevis configured to connect the actuator to the half nuts so as to allow the actuator to swing with respect to the gripping member.
    Type: Application
    Filed: January 31, 2012
    Publication date: February 12, 2015
    Applicant: MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO., LTD.
    Inventor: Naoki Kato
  • Patent number: 8814552
    Abstract: Breakage of the actuator moving the movable platen in the clamping device of an injection molder is prevented. The clamping device includes a movable platen shifting device increasing and decreasing a horizontal distance between the movable platen (3) and the fixed platen (2). It includes an actuator (41), a clevis pin connecting the actuator (41) and the movable platen (3), a clevis pin holding part holding a central axis of the clevis pin perpendicular to a moving direction of the movable platen (3), and a clevis pin connecting part that connects the actuator (41) and the clevis pin. The clevis pin connecting part is a supporting structure rotating with the clevis pin. The clevis pin connecting part is supported by the movable platen (3). The clevis pin, the clevis pin connecting part, and the front end of the actuator are aligned in a straight line.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: August 26, 2014
    Assignee: Mitsubishi Heavy Industries Plastic Technology Co., Ltd.
    Inventors: Saburo Fujita, Naoki Kato
  • Patent number: 8741193
    Abstract: The injection molding method for injecting a resin into a cavity formed within a mold is provided with a heating step in which the temperature of a cavity surface forming the cavity of the mold is heated to a temperature equal to or higher than a heat distortion temperature of the resin and an injection step in which after the heating step, during a decrease in temperature of the cavity surface of the mold, the resin is injected into the cavity.
    Type: Grant
    Filed: March 18, 2010
    Date of Patent: June 3, 2014
    Assignee: Mitsubishi Heavy Industries Plastic Technology Co., Ltd.
    Inventors: Naoki Toda, Satoshi Imaeda, Toshihiko Kariya, Takeshi Yamaguchi
  • Patent number: 8641400
    Abstract: There is provided a mold clamping apparatus that can prevent a molding material from spouting from a split surface of a mold even if in-cavity resin pressure causes offset of a mold opening force, and can extend the life of the mold. The mold clamping apparatus includes a control device that estimates a mold opening force by mold internal pressure for molding with mold internal pressure being asymmetrical with respect to a center of a mold block, determines a mold clamping hydraulic value applied to each tie bar correspondingly to the estimated mold opening force, and distributes hydraulic pressure supplied to each tie bar so that the determined mold clamping hydraulic value is reached.
    Type: Grant
    Filed: March 17, 2009
    Date of Patent: February 4, 2014
    Assignees: Mitsubishi Heavy Industries Plastic Technology Co., Ltd., Mitsubishi Heavy Industries, Ltd.
    Inventors: Kazunori Kuga, Takashi Mizuno, Toshihiko Kariya, Nobuhiro Uchida, Koji Suzuki
  • Publication number: 20130313746
    Abstract: A hydraulic supply device of an injection molding machine is provided with: a first main hydraulic power source including a first main hydraulic pump having a variable capacity and driven by a first constant rotational speed motor, and a first main discharge pipe through which working oil flows; an auxiliary hydraulic power source including an auxiliary hydraulic pump driven by a servo motor and operated at a specific capacity, an auxiliary discharge pipe through which the working oil flows, and a check valve that regulates the inflow of working oil to the auxiliary hydraulic pump; a hydraulic control unit that controls the first main hydraulic power source and the auxiliary hydraulic power source; a junction pipe at which the first main discharge pipe and the auxiliary discharge pipe join; and a switching unit that switches the supply/non-supply of working oil for a hydraulic actuator.
    Type: Application
    Filed: April 6, 2011
    Publication date: November 28, 2013
    Applicant: Mitsubishi Heavy Industries Plastic Technology Co. Ltd.
    Inventors: Masaaki Ikarashi, Mamoru Kawasaki
  • Patent number: 8550800
    Abstract: It is an object to prevent dies from interfering with each other when the dies are closed and effectively prevent overshoot of cavity temperature while efficiently performing heating of the dies. In an injection molding machine for two-material molding including two sets of a first injecting unit and a second injecting unit that respectively plasticize different resin materials and inject and fill the resin materials, prior to performing injection molding on the first injecting unit side on a secondary side, after injection molding on the second injecting unit side on a primary side, heating of the dies is started before 180-degree rotation of a rotary die plate is completed. After the start of heating, until the 180-degree rotation of the rotary die plate is completed, i.e., die closing is performed, die temperatures are maintained within a temperature range set higher than die temperatures during the heating start and lower than die temperatures during injection.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: October 8, 2013
    Assignee: Mitsubishi Heavy Industries Plastic Technology Co., Ltd.
    Inventors: Satoshi Miyagawa, Naoki Kato, Yasuaki Ozeki, Hiroto Matsushita, Masamitsu Saji, Yasuo Okochi, Toshihiko Kariya, Koji Kubota
  • Publication number: 20130220459
    Abstract: A hydraulic oil storage device and an injection molding device are provided with a connection box that partitions a storage region of a sub-tank into a first region that includes a flow channel opening portion for a coupling tube and a second region other than the first region, in which the connection box is provided with an internal region communication portion that brings the first region and the second region into communication, and causes a pressure loss equal to the pressure loss of the coupling tube, or a pressure loss greater than that pressure loss, and a return tube is connected to the sub-tank so that the flow channel outlet faces the first region.
    Type: Application
    Filed: September 26, 2012
    Publication date: August 29, 2013
    Applicants: MITSUBISHI HEAVY INDUSTRIES, LTD., MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO. , LTD.
    Inventors: MITSUBISHI HEAVY INDUSTRIES PLASTIC TEC, MITSUBISHI HEAVY INDUSTRIES, LTD.
  • Publication number: 20130200552
    Abstract: A plasticizing screw for injection molding according to the present invention is a plasticizing screw for injection molding that is installed in an injection molding machine which performs injection molding by plasticizing granular thermoplastic resin feedstock containing reinforcement fibers, and includes a shaft, a flight, and a mixer. The mixer is provided in plural stages in an axial direction, and the number of fins of the mixer of each stage increases toward a leading end side in the axial direction from a rear end side in the axial direction. Further, the protrusion height of each fin from the peripheral surface of the shaft is lower than the protrusion height of the flight from the peripheral surface of the shaft.
    Type: Application
    Filed: October 29, 2010
    Publication date: August 8, 2013
    Applicant: Mitsubishi Heavy Industries Plastic Technology Co., Ltd.
    Inventors: Toshihiko Kariya, Naoki Toda, Munehiro Nobuta
  • Patent number: 8460586
    Abstract: An injection molding device is provided with a mold, an injection unit equipped with an injection screw that is displaceably configured such that a molten resin is filled into a cavity by forward movement to perform plural injection operations including at least a filling operation and a pressure keeping operation by displacing the injection screw, a position sensor for detecting the position of the injection screw, a temperature sensor capable of measuring the temperature of the vicinity of the cavity of the mold, a temperature adjustment unit capable of adjusting the temperature of the mold by heating or cooling the mold, a control unit for controlling the displacement of the injection screw and the temperature of the mold and determining plural switching timings of the injection operations on the basis of the position of the screw, and a display unit for displaying an image.
    Type: Grant
    Filed: April 15, 2009
    Date of Patent: June 11, 2013
    Assignee: Mitsubishi Heavy Industries Plastics Technology Co., Ltd.
    Inventors: Toshihiko Kariya, Michitaka Hattori, Shigeru Nozaki, Satoshi Imaeda
  • Publication number: 20130099421
    Abstract: A plasticizing screw for injection molding according to the present invention is installed in an injection molding machine that performs injection molding by plasticizing thermoplastic resin feedstock containing reinforcement fibers, and includes a shaft, a main flight, and a sub-flight. The protrusion height of the main flight from the circumferential surface of the shaft is formed to be constant in at least an area in which the sub-flight is provided.
    Type: Application
    Filed: October 25, 2010
    Publication date: April 25, 2013
    Applicant: MITSUBISHI HEAVY INDUSTRIES PLASTIC TECHNOLOGY CO. LTD
    Inventors: Toshihiko Kariya, Naoki Toda, Munehiro Nobuta