EP3064292B1 - Mold shaping device - Google Patents

Mold shaping device Download PDF

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Publication number
EP3064292B1
EP3064292B1 EP14857419.7A EP14857419A EP3064292B1 EP 3064292 B1 EP3064292 B1 EP 3064292B1 EP 14857419 A EP14857419 A EP 14857419A EP 3064292 B1 EP3064292 B1 EP 3064292B1
Authority
EP
European Patent Office
Prior art keywords
mold
runners
forming
foamed mixture
forming mold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14857419.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3064292A1 (en
EP3064292A4 (en
Inventor
Takumi MAEGAWA
Hirotsune WATANABE
Masaomi MITSUTAKE
Toshio Kanno
Hirotaka Kurita
Yusuke Kato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sintokogio Ltd
Toyota Motor Corp
Original Assignee
Sintokogio Ltd
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sintokogio Ltd, Toyota Motor Corp filed Critical Sintokogio Ltd
Priority to PL14857419T priority Critical patent/PL3064292T3/pl
Publication of EP3064292A1 publication Critical patent/EP3064292A1/en
Publication of EP3064292A4 publication Critical patent/EP3064292A4/en
Application granted granted Critical
Publication of EP3064292B1 publication Critical patent/EP3064292B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C13/00—Moulding machines for making moulds or cores of particular shapes
    • B22C13/08—Moulding machines for making moulds or cores of particular shapes for shell moulds or shell cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C19/00—Components or accessories for moulding machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould

Definitions

  • the present invention relates to a mold forming apparatus, and more particularly to a mold forming apparatus including: a storage tank that has in its bottom an injection port capable of being opened and closed and that stores a foamed mixture formed by agitating a granular aggregate and an additive; a forming mold that has a runner into which the foamed mixture is introduced through the injection port of the storage tank and that has a cavity for forming the introduced foamed mixture into a mold in a predetermined shape; and pressing means that is disposed so as to correspond to the forming mold and that presses the foamed mixture stored in the storage tank to inject the foamed mixture into the cavity through the runner of the forming mold.
  • Patent Document 1 is known as related art of a mold forming apparatus.
  • Patent Document 1 describes a mold forming apparatus that forms a mold by filling a cavity of a heated mold with a foamed mixture formed by agitating a granular aggregate, a water soluble binder, and water by an injection method, characterized by including: mixture storage means that has a hollow rectangular parallelepiped body having the shape of a rectangular parallelepiped and having a space extending in the vertical direction, that has a bottom plate closing an opening at the lower end of the hollow rectangular parallelepiped body and having injection holes for injecting the foamed mixture, and that has both a function as an agitation tank in which the granular aggregate, the water soluble binder, and the water are agitated, and a function as an injection cylinder that stores the foamed mixture in order to inject the foamed mixture; and plug means capable of closing the injection holes.
  • a plurality of runners are formed in the forming mold according to the size, shape, etc. of a mold to be formed, and a plurality of injection holes are formed in the bottom plate of the hollow rectangular parallelepiped body (hereinafter referred to as a "bottom of the storage tank") so as to correspond to inlets of the runners.
  • the runners are typically formed linearly and parallel to the direction in which the foamed mixture stored in the storage tank is injected.
  • the forming mold is typically formed by a pair of forming molds that can be opened and closed, and is often formed such that abutting surfaces (parting surface) of both the forming molds extend in a direction perpendicular to the direction in which the pressing means presses the foamed mixture, that is, such that the runners are formed in one of the forming molds and the direction in which the forming molds are opened and closed is parallel to the direction in which the pressing means presses the foamed mixture.
  • Patent Document 2 discloses a mold forming apparatus having the features of the preamble of independent claim 1.
  • injection ports are formed in the bottom of the storage tank so as to correspond to the inlets of the runners.
  • the bottom of the storage tank therefore needs to have substantially the same size as the maximum width of the surface of the forming mold in which the inlets of the runners are formed.
  • the storage tank is formed in a cylindrical shape in order to agitate the granular aggregate and the additive to form the foamed mixture by rotating agitating blades in the storage tank
  • the storage tank is formed such that the diameter of the bottom of the cylindrical storage tank is substantially the same as the maximum width of the surface of the forming mold in which the inlets of the runners are formed. Accordingly, in the case where the cavity of the forming mold is large or has a complex shape etc., the diameter of the storage tank is increased accordingly, which increases the overall size of the mold forming apparatus and the space required to install the mold forming apparatus.
  • the direction in which the forming molds are opened and closed is parallel to the direction in which the pressing means presses the foamed mixture
  • a large distance is required between the forming mold and the pressing means so that the forming mold does not interfere with the pressing means when opened. This increases the overall size of the mold forming apparatus and the space required to install the mold forming apparatus.
  • the runners are formed in one of the forming molds. In this case, the solidified foamed mixture remains in the runners after a mold is formed, and it is difficult to remove this solidified foamed mixture.
  • the present invention was developed in view of the above problems, and it is an object of the present invention to provide a mold forming apparatus capable of accurately forming a mold by reliably causing a foamed mixture to appropriately fill a cavity of a forming mold by a simple configuration, and capable of achieving reduction in size.
  • a mold forming apparatus of claim 1 is a mold forming apparatus including a storage tank that has in its bottom a plurality of injection ports capable of being opened and closed, and that stores a foamed mixture formed by agitating a granular aggregate and an additive, a forming mold that has a plurality of runners into which the foamed mixture is introduced through their inlets formed so as to correspond to the respective injection ports of the storage tank, and that has a cavity for forming the introduced foamed mixture into a mold with a predetermined shape, and pressing means that is disposed so as to correspond to the forming mold and that presses the foamed mixture stored in the storage tank to inject the foamed mixture into the cavity through the runners of the forming mold, characterized in that a parting surface of the forming mold is formed parallel to a pressing direction of the pressing means, and each of the runners of the forming mold is formed in the parting surface and is tilted with respect to the pressing direction of the pressing means so as to spread
  • the invention of the mold forming apparatus of claim 2 is characterized in that the runners extend from the inlets and branch off in an intermediate portion on a downstream side being allowed to obtain the plurality of outlets guided to the cavities.
  • the parting surface of the forming mold is formed parallel to the pressing direction of the pressing means, and each of the runners of the forming mold is formed in the parting surface of the forming mold and is tilted with respect to the pressing direction of the pressing means so as to spread apart from other runners from the inlet toward its outlet to the cavity.
  • the bottom of the storage tank can be made smaller than the maximum width of the surface of the forming mold in which the inlets of the runners are formed.
  • the storage tank therefore need not have a size according to the size of the forming mold, and can thus be reduced in size.
  • the forming mold does not interfere with the pressing means when opened.
  • the mold forming apparatus can thus be reduced in size. Since the runners are formed in the parting surface of the forming mold, any solidified foamed mixture remaining inside the runners can be easily removed by opening the forming mold.
  • the runners extend from the inlets and branch off in an intermediate portion on the downstream side, and have the plurality of the outlets, which guide to the cavities.
  • the inlets of the runners therefore need not be formed so as to correspond to the number of cavities, and the foamed mixture can be reliably caused to appropriately fill the cavities of the forming mold.
  • invention that can be claimed includes at least the "invention” or “present invention” that is the invention described in the claims, but may include an invention having a narrower concept than the present invention or an invention having a broader concept or a different concept than the present invention) will be shown and described below.
  • the forms are divided into items, the items are numbered, and the number(s) of other item(s) is cited as necessary. This is merely for facilitating understanding of the invention that can be claimed, and is not intended to limit the combination of constituent elements forming the invention that can be claimed to the combinations described in the items shown below.
  • the agitating member After the granular aggregate and the additive which have been put in the storage tank are agitated by the agitating member to form the foamed mixture, the agitating member is immediately moved relative to the storage tank to the withdrawn position by the moving means, and the storage tank is relatively moved to the position between the forming mold and the pressing means to connect the injection ports to the inlets of the runners of the forming mold.
  • the cavities of the forming mold can thus be reliably and quickly filled with the foamed mixture in a satisfactory state.
  • FIGS. 1 to 3 An embodiment of a mold forming apparatus of the present invention will be described in detail based on FIGS. 1 to 3 .
  • the same reference numerals and characters are used throughout the figures to denote similar or corresponding portions.
  • the mold forming apparatus of the present invention generally includes: a storage tank 1 that has in its bottom 1a a plurality of injection ports 10 capable of being opened and closed, and that stores a foamed mixture formed by agitating a granular aggregate and an additive; a forming mold 2 that has a plurality of runners 20 into which the foamed mixture is introduced through their inlets 20a formed so as to correspond to the respective injection ports 10 of the storage tank 1, and that has cavities 21 for forming the introduced foamed mixture into a mold with a predetermined shape; and pressing means 3 that is disposed so as to correspond to the forming mold 2 and that presses the foamed mixture stored in the storage tank 1 to inject the foamed mixture into the cavities 21 through the runners 20 of the forming mold 2.
  • a parting surface 22 of the forming mold 2 is formed parallel to a pressing direction P of the pressing means 3.
  • Each of the runners 20 of the forming mold 2 is formed in the parting surface 22 and is tilted with respect to the pressing direction P of the pressing means 3 so as to spread apart from other runners in a direction from the inlet toward its outlet guided to the cavity.
  • the runners 20 extend from the inlets 20a and branch off in an intermediate portion on a downstream side being allowed to obtain the plurality of the outlets 20b guided to the cavities 21.
  • the storage tank 1 is formed in a cylindrical shape (hereinafter referred to as the "cylindrical tank 1"), and the bottom 1a has a diameter D smaller than the maximum width W of a surface 2a of the forming mold 2 in which the inlets 20a of the runners 20 are formed.
  • the mold forming apparatus of the present embodiment further includes agitating means 4 including an agitating member 40 that rotates inside the cylindrical tank 1 to agitate the granular aggregate and the additive, which have been put in the cylindrical tank 1, to form the foamed mixture.
  • the mold forming apparatus of the present embodiment further includes moving means (described later) for relatively moving the cylindrical tank 1 and the agitating member 40 between an agitating position where the agitating member 40 is located inside the cylindrical tank 1 and a withdrawn position where the agitating member 40 is located outside the cylindrical tank 1 and for relatively moving the cylindrical tank 1 between the withdrawn position and a position between the forming mold 2 and the pressing means 3 where the injection ports 10 are connected to the inlets 20a of the runners 20 of the forming mold 2.
  • moving means described later
  • the cylindrical tank 1 is open in its upper part and has the plurality of injection ports 10 in the bottom 1a.
  • the bottom 1a therefore has a circular shape as shown in FIG. 2 .
  • the bottom 1a is provided with opening/closing means such as a plug member or a shutter which controllably opens and closes the injection ports 10.
  • the forming mold 2 is formed by a pair of forming molds 2A, 2B so that the parting surface 22 of the forming molds 2A, 2B extends vertically.
  • the forming molds 2A, 2B are therefore opened and closed along the vertical direction on the paper of FIG. 2 showing a plan view.
  • the runners 20 for introducing the foamed mixture and the cavities 21 for forming a mold with a predetermined shape are formed in abutting surfaces of the forming molds 2A, 2B.
  • the inlets 20a of the runners 20 are open at the upper surface of the forming mold 2 in FIG. 3 .
  • the inlets 20a of the runners 20 are disposed so as to be aligned with the injection ports 10 when the cylindrical tank 1 is located on the surface 2a of the forming mold 2 in which the inlets 20a of the runners 20 are formed.
  • the runners 20 are formed such that small parts of their upstream portions which extend from the inlets 20a to be connected to the injection ports 10 are parallel to the pressing direction P of the pressing means 3.
  • the runners 20 are bent at an intermediate position, and their intermediate portions forming large parts of the runners 20 are tilted with respect to the pressing direction P of the pressing means 3 so as to spread apart from each other.
  • each of the runners 20 branches into two in its downstream portion, and the outlets 20b are respectively open to a plurality of the cavities 21 via a core print part 23 provided in the forming mold 2.
  • the angle at which the runners 20 are tilted with respect to the pressing direction P of the pressing means 3 can be set as appropriate in view of the shape and size of a mold to be formed, the positions of the cavities 21 that are formed in the forming mold 2, fluidity of the foamed mixture, etc.
  • the pressing means 3 has a cylinder 30 provided above the forming mold 2, and a piston 31 fittingly inserted in the cylinder 30 and provided with a pressing portion 31a that enters the cylindrical tank 1 through an opening in the upper part of the cylindrical tank 1 to press the foamed mixture.
  • the pressing direction P of the pressing means 3 is downward in the vertical direction in FIG. 3 .
  • the pressing portion 31a at the tip end of the piston 31 can thus enter the cylindrical tank 1 through the opening in the upper part of the cylindrical tank 1 and press the foamed mixture to inject the foamed mixture through the injection ports 10 to fill the cavities 21 with the foamed mixture through the runners 20 of the forming mold 2. That is, the cylindrical tank 1 functions as an injection cylinder that injects the foamed mixture stored therein to fill the cavities 21 of the forming mold 2 with the foamed mixture.
  • the parting surface 22 of the forming molds 2A, 2B extends vertically, and the forming molds 2A, 2B are opened and closed along the lateral direction or in the front -back direction in the plane of the paper of FIG. 3 .
  • the cylinder 30 can therefore be disposed at about such a height that, with the piston 31 in the cylinder 30 being in a retracted state, the pressing portion 31a does not interfere with the cylindrical tank 1 when the cylindrical tank 1 is moved to the left from the withdrawn position of agitating blades 40a as indicated by an arrow S in FIG. 1 .
  • the agitating member 40 of the agitating means 4 has a plurality of agitating blades 40a around a rotary shaft 40b.
  • the rotary shaft 40b for the agitating blades 40a is connected to a rotary drive shaft of a motor 41.
  • the motor 41 is supported by a support member 42.
  • the cylindrical tank 1 can function not only as the injection cylinder described above but also as an agitation tank in which the granular aggregate and the additive are agitated to form the foamed mixture.
  • the agitating blades 40a can also be reduced in size. The load on the motor 41 that drivingly rotates the agitating blades 40a is therefore reduced accordingly, whereby the motor 41 can also be reduced in size.
  • the moving means includes: agitating blade moving means 5 that moves the agitating blades 40a of the agitating means 4 between the agitating position where the agitating blades 40a having been moved into the cylindrical tank 1 through the opening in the upper part of the cylindrical tank 1 can agitate the granular aggregate and the additive, and the withdrawn position where the agitating blades 40a are withdrawn out of the cylindrical tank 1 through the opening in the upper part of the cylindrical tank 1 (see an arrow V in FIG. 1 ); and moving the cylindrical tank 1 to the position between the pressing portion 31a and the forming mold 2 with the agitating blades 40a being located at the withdrawn position and the piston 31 of the pressing means 3 being in the retracted state (see the arrow S in FIG.
  • the agitating blade moving means 5 includes a cylinder 50 disposed at a predetermined height and having the support member 42 bonded to the tip end of a piston rod 51.
  • the piston rod 51 of the cylinder 50 is immediately driven to retract so that the agitating blades 40a are moved to withdraw, and the cylindrical tank 1 is moved in the direction indicated by the arrow S in FIG. 1 to the position between the upper surface 2a of the forming mold 2 and the pressing portion 31a of the pressing means 3.
  • the bottom 1a is placed on the upper surface 2a of the forming mold 2 such that the injection ports 10 are aligned with the inlets 20a of the runners 20.
  • the cavities 21 of the forming mold 2 are thus filled with the foamed mixture in a satisfactory state, and a mold having satisfactory shape accuracy etc. can be formed.
  • the outlets 20b of the runners 20 which open to the cavities 21 in the forming mold 2 are disposed according to the size or shape of a mold to be formed.
  • the runners 20 are formed in the parting surface 22 of the forming mold 2 and are tilted with respect to the pressing direction P of the pressing means 3 so as to spread apart from each other from the inlets 20a toward the outlets 20b.
  • the inlets 20a of the runners 20 are formed in the upper surface 2a of the forming mold 2 which is to be contacted by the cylindrical tank 1, and are open to the parting surface 22 of the forming molds 2A, 2B.
  • the injection ports 10 of the cylindrical tank 1 are disposed in the bottom 1a such that the injection ports 10 can be aligned with the inlets 20a of the runners 20 so as to communicate with the inlets 20a of the runners 20.
  • the cylindrical tank 1 is therefore formed such that its diameter D is smaller than the maximum width W of the forming mold 2.
  • the diameter D of the cylindrical tank 1 can be set such that the area of the bottom 1a is 70% to 30%, more preferably 50% to 30%, of that of the upper surface 2a of the forming mold 2 in which the inlets 20a of the runners 20 are open. This can reliably make the bottom 1a of the cylindrical tank 1 smaller than the maximum width W of the upper surface 2a of the forming mold 2 in which the inlets 20a of the runners 20 are formed.
  • the mold forming apparatus can therefore be reduced in size. Since the parting surface 22 of the forming mold 2 is parallel to the pressing direction P of the pressing means 3, the pressing means 3 does not interfere with the forming mold 2 when the forming mold is opened. The mold forming apparatus can therefore be reduced in size. Any solidified foamed mixture remaining in the runners 20 can be easily removed by opening the forming mold 2.
  • the present invention is not limited to the above embodiment in which the bottom 1a of the cylindrical tank 1 is positioned on the lower side in the figure and the pressing means 3 presses the foamed mixture from above.
  • the present invention may include a configuration in which the bottom 1a of the cylindrical tank 1 is disposed laterally, the forming mold 2 is disposed laterally on the bottom 1a of the cylindrical tank 1, and the pressing means 3 laterally presses the foamed mixture to fill the cavities of the forming mold 2 with the foamed mixture.
  • the present invention may also include a configuration in which the bottom 1a of the cylindrical tank 1 is positioned on the upper side upward, the forming mold 2 is disposed on the bottom 1a of the cylindrical tank 1, and the pressing means 3 presses the foamed mixture from below to fill the cavities of the forming mold 2 with the foamed mixture, etc.
  • the present invention can be applied to any apparatus that forms a mold in a predetermined shape by storing in a storage tank a foamed mixture formed by agitating a granular aggregate and an additive, and pressing the foamed mixture by pressing means to inject the foamed mixture from the storage tank through an injection port to fill a cavity with the foamed mixture through a runner of a forming mold.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Devices For Molds (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP14857419.7A 2013-10-30 2014-09-17 Mold shaping device Active EP3064292B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14857419T PL3064292T3 (pl) 2013-10-30 2014-09-17 Urządzenie do formowania formy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013225382A JP5854525B2 (ja) 2013-10-30 2013-10-30 鋳型造型装置
PCT/JP2014/074549 WO2015064236A1 (ja) 2013-10-30 2014-09-17 鋳型造型装置

Publications (3)

Publication Number Publication Date
EP3064292A1 EP3064292A1 (en) 2016-09-07
EP3064292A4 EP3064292A4 (en) 2017-07-26
EP3064292B1 true EP3064292B1 (en) 2018-05-16

Family

ID=53003849

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14857419.7A Active EP3064292B1 (en) 2013-10-30 2014-09-17 Mold shaping device

Country Status (6)

Country Link
US (1) US20160228942A1 (ja)
EP (1) EP3064292B1 (ja)
JP (1) JP5854525B2 (ja)
CN (1) CN105705267A (ja)
PL (1) PL3064292T3 (ja)
WO (1) WO2015064236A1 (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10149028B2 (en) 2016-04-15 2018-12-04 Hi-Tech Mold & Engineering, Inc. Die insert for molding a speaker grille
US10144164B2 (en) 2016-04-15 2018-12-04 Hi-Tech Mold & Engineering, Inc. Die insert for molding a speaker grille and method of forming same
CN110587940B (zh) * 2019-08-23 2022-02-18 合肥帝品数码科技有限公司 一种pvc发泡板挤出模具
JP7310666B2 (ja) * 2020-03-16 2023-07-19 トヨタ自動車株式会社 中子成形装置

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US1432666A (en) * 1921-03-21 1922-10-17 Ira A Wyant Core-box plate
FR2382293A1 (fr) * 1977-03-02 1978-09-29 Pont A Mousson Machine a fabriquer des noyaux de fonderie
US4135569A (en) * 1977-07-13 1979-01-23 Acme-Cleveland Corporation Molding machine clean out
DE2833999C2 (de) * 1978-08-03 1981-11-19 Eugen Dipl.-Ing. 8871 Burtenbach Bühler Verfahren und Vorrichtung zur Herstellung von Gießformen und -kernen
US4239079A (en) * 1979-05-30 1980-12-16 Joseph Simmons Sand deflector for automatic molding machine
JPH04127936A (ja) * 1990-09-19 1992-04-28 Sanyu:Kk シェルモールド中子形成装置
JPH0747445A (ja) * 1993-08-06 1995-02-21 Honda Motor Co Ltd 金型鋳造法
JPH0929387A (ja) * 1995-07-20 1997-02-04 Aisin Takaoka Ltd 中子金型加熱制御装置
JP3407877B2 (ja) * 2000-03-24 2003-05-19 新東工業株式会社 吹込み式鋳型造型機
WO2001070433A1 (fr) * 2000-03-21 2001-09-27 Sintokogio, Ltd. Dispositif de soufflage de sable de moulage, destine a des machines de moulage
US20040031580A1 (en) * 2002-08-15 2004-02-19 Smith Douglas W. Contour mold casting method
DE602005024953D1 (de) 2004-03-23 2011-01-05 Sintokogio Ltd Allformeinheit für den einsatz darin
JP4301343B2 (ja) * 2005-11-21 2009-07-22 新東工業株式会社 鋳型の造型方法
JP5484502B2 (ja) * 2012-03-13 2014-05-07 リョービ株式会社 中子製造装置

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Also Published As

Publication number Publication date
PL3064292T3 (pl) 2018-09-28
EP3064292A1 (en) 2016-09-07
WO2015064236A1 (ja) 2015-05-07
CN105705267A (zh) 2016-06-22
EP3064292A4 (en) 2017-07-26
JP5854525B2 (ja) 2016-02-09
US20160228942A1 (en) 2016-08-11
JP2015085351A (ja) 2015-05-07

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