EP1964626A1 - Verfahren und Vorrichtung zur Herstellung von Formen für dichte Behälter - Google Patents

Verfahren und Vorrichtung zur Herstellung von Formen für dichte Behälter Download PDF

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Publication number
EP1964626A1
EP1964626A1 EP07012211A EP07012211A EP1964626A1 EP 1964626 A1 EP1964626 A1 EP 1964626A1 EP 07012211 A EP07012211 A EP 07012211A EP 07012211 A EP07012211 A EP 07012211A EP 1964626 A1 EP1964626 A1 EP 1964626A1
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EP
European Patent Office
Prior art keywords
flask
frame
sand
pattern
lifting
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.)
Withdrawn
Application number
EP07012211A
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English (en)
French (fr)
Inventor
Minoru Hirata
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
Original Assignee
Sintokogio Ltd
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 filed Critical Sintokogio Ltd
Publication of EP1964626A1 publication Critical patent/EP1964626A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/02—Compacting by pressing devices only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/02—Compacting by pressing devices only
    • B22C15/08—Compacting by pressing devices only involving pneumatic or hydraulic mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing

Definitions

  • This invention relates to a method and a device for producing a tight-flask mold, especially one for successively producing a plurality of tight-flask molds.
  • a PCT application that was published as International Publication WO0132333 discloses a prior-art method and device relating to the method and device of the present invention for producing tight-flask molds.
  • the molding device disclosed by this publication for squeezing molding sand in a mold space defined by a pattern plate having a pattern and located in a predetermined position, a flask to be placed on the pattern plate for enclosing the pattern, and a filling frame to be placed on the flask, comprises a plurality of spaced-apart, fixedly and uprightly mounted, and upwardly-facing cylinders; a mounting frame secured to the tips of the piston rods of the upwardly-facing cylinders and supported above the mold space for vertical movement; a sand hopper secured to the mounting frame, holding molding sand therein and having a plurality of spaced-apart sand-filling nozzles at the lower part thereof for supplying the molding sand from the sand hopper to the mold space, the
  • Forming a mold space (a space in which molding sand is filled) in the molding device disclosed in WO13233 includes two steps, namely, a step of placing a flask on a leveling frame, and a step of placing a filling frame on the flask and lowering the squeeze feet to allow it to advance into the filling frame. Further, to transfer the tight-flask mold after demolding, lifting it also includes two steps, namely, a step of allowing a roller device to come into contact with the flask, and after that contact a step of lifting the tight-flask mold to an upper stop end. Accordingly, in that conventional mold-space forming, a problem is caused in that the cycle to produce a mold is long. Thus the industries in this art have a need for a method and a device that can shorten as much as possible the cycle to produce a mold.
  • This invention has been conceived in view of the above circumstances.
  • the purpose of it is to provide a method and a device that can shorten as much as possible the cycle to produce a mold.
  • the method of the invention is a method for producing a tight-flask mold by transferring the mold to a position between a pattern carrier and a sand hopper by a flask conveyor that horizontally transfers flasks at a transfer level.
  • the method includes the steps of keeping the flask in the position at the transfer level, while lowering the sand hopper, squeeze means, and a filling frame to the flask and lifting the pattern carrier and a box-like frame to the frame, thereby defining a mold space by the sand hopper, the squeeze means, the filling frame, the flask, the pattern carrier, and the box-like frame; squeezing molding sand in the mold space to produce a tight-flask mold; and lifting the sand hopper, the squeeze means, and the filling frame and lowering the pattern carrier and the box-like frame, thereby allowing the tight-flask mold to be ready to be transferred.
  • the device of the invention is a molding device for producing a tight-flask mold, comprising a lifting and supporting frame mounted on tops of upwardly-facing cylinders that are uprightly mounted on right and left sides of the base of the molding device; a pattern carrier for holding a pattern plate; a box-like frame for surrounding the periphery of the pattern carrier, said box-like frame being vertically movable; a pattern changer rotatably mounted on one of the upwardly-facing cylinders, for holding a plurality of said pattern carriers and for alternatively transferring the pattern carriers to and away from a position above a central part of the base of the molding device; a two-stage lifting means disposed below the pattern carrier that is located above the central part of the base of the molding device, for lifting the pattern carrier and the box-like frame; a sand hopper suspended from the lifting and supporting frame, said sand hopper including an air-ejecting chamber for an aeration that allows air to be ejected into molding
  • the mold space is formed by substantially one step, namely, by lowering the sand hopper, the squeeze means, and the filling frame, and by lifting the pattern carrier and the box-like frame to the flask
  • the cycle to produce a mold is shorter than in the conventional two-step mold space forming.
  • the cycle to produce a mold is again shortened compared with the conventional method, wherein the tight-flask mold is made ready to be transferred by the two steps.
  • upwardly-facing cylinders 2, 2 are uprightly mounted on right and left sides of the base 1 of a molding device.
  • a lifting and supporting frame 3 is mounted on the tops of the piston rods 2a, 2a of the upwardly-facing cylinders 2, 2.
  • a rotary pattern changer 4 which is rotatable in a horizontal plane, is mounted at its central part on one of the upwardly-facing cylinders 2, 2 (the cylinder located at the left side in Fig. 1 ) at its lower part.
  • Pattern carriers 6 and 6A are placed on the ends of the pattern changer 4.
  • the pattern carriers 6 and 6A hold pattern plates 5a and 5a, respectively.
  • the pattern plates 5a, 5a may hold the same patterns or different patterns (for example, an upper pattern half for a cope and a lower pattern half for a drag).
  • the pattern carriers 6, 6A are alternately transferred to or from a position located above the base 1 of the molding device.
  • a plurality of guide rods 7, 7 are secured to the four corners of the bottom of each pattern carrier 6 or 6A.
  • the guide rods 7, 7 are vertically and slidably inserted in holder parts 8a, 8a of box-like frames 8, 8A, which surround the pattern carriers 6, 6A and are movable vertically.
  • a plurality of positioning members 4b, 4b ( Fig. 2 ) are secured to the upper surfaces of frame parts 4a, 4a of the pattern changer 4.
  • the box-like frames 8, 8A are placed in position on the pattern changer 4 by allowing depressions formed in the box-like frames 8, 8A to be placed on and engaged by the positioning members 4b, 4b.
  • the pattern carriers 6, 6A are set on the pattern changer 4 through the box-like frames 8, 8A.
  • the box-like frames 8, 8A are moved upward with respect to the frame parts 4a, 4a.
  • a two-stage lifting means 9 is disposed below that pattern carrier 6.
  • the structure of the two-stage lifting means (a telescopic cylinder) 9 is now explained in detail.
  • a first lifting member 9c of which the periphery extends upward, is secured to the upper end of a first lifting rod 9b of a first cylinder 9a of the two-stage lifting means 9.
  • a through hole 9d is formed in the center of the first lifting members 9c.
  • the two-stage lifting means is arranged such that a second lifting rod 9f of a second cylinder 9e is disposed in the first lifting rod 9b.
  • the first lifting rod 9b of the first cylinder 9a acts as a cylinder of the second cylinder 9e.
  • the second lifting rod 9f passes through the through hole 9d.
  • a second lifting member 9g is secured to the upper end of the second lifting rod 9f.
  • the second lifting member 9g has holding means 9h, 9h ( Fig. 2 ).
  • the pattern-carrier holding means 9h, 9h in this embodiment are means that use electromagnets for holding the pattern carrier. However, those means are not limited to this. There may be other means such as suction or some mechanical members to hold the pattern carrier.
  • a sand hopper 14 is suspended from the lifting and supporting frame 3.
  • the sand hopper 14 has a sand-feeding port 11 at its top, which is opened or closed by a sliding gate 10, and has an air-supply pipe 12 at its lower part.
  • a valve for the air-supply pipe 12
  • a low-pressure airflow (for example, at a pressure of 0.05-0.18 MPa) may be introduced into the sand hopper 14 through the air-supply pipe 12.
  • the sand hopper 14 also has a number of air-ejecting chambers 13, 13 at its inner lower part.
  • the air-ejecting chambers are connected to a pressurized-air source (not shown) through a valve (not shown) so that low-pressure airflows (for example, at a pressure of 0.05-0.18 MPa) are ejected from them into the sand hopper 14 for aerating molding sand S in the hopper to fluidize it.
  • a plurality of squeeze feet as a squeeze means are disposed at the lower end of the sand hopper 14. The squeeze feet are vertically movable and can stop at any level along their vertical passage.
  • Sand-filling nozzles 16, 16 are disposed around the squeeze feet 15, 15.
  • a filling frame 17 is disposed and connected to downwardly-facing, filling-frame cylinders 18, 18 such that it can vertically move and surround the group of the squeeze feet and the sand-filling nozzles 16, 16. Some vent holes (not shown) are formed in the upper part of the filling frame 17.
  • a roller conveyor 20, acting as a flask conveyor is disposed in a position between the sand hopper 14 and the pattern carrier 6 that is located above the central part of the base 1 of the molding device for horizontally transferring flasks 19 to and from that position.
  • the roller conveyor 20, which is secured to a frame (not shown), holds the flasks 19 at the transfer level of the roller conveyor 20, at which level the flasks 19 are transferred along the roller conveyor.
  • Fig. 1 shows the stage of a device wherein the pattern carrier 6 in which the pattern plate 5 is placed has been transferred to the position above the central part of the base 1 of the molding device, and wherein an empty flask 1 has been transferred by the roller conveyor 20 to the position between the sand hopper 14 and the pattern carrier 6.
  • the molding sand S has been introduced into the sand hopper 14, and the plurality of squeeze feet 15, 15 are disposed to form a concave and convex shape (i.e., they are positioned at different levels) corresponding to the concave and convex shape of the pattern plate 5.
  • the box-like frame 8 is located to project upward by a small amount (30 mm in this embodiment) from the periphery of the surface of the pattern plate 5.
  • the sliding gate 10 is operated to close the sand-feeding port 11. Then, the upwardly-facing cylinders 2, 2 are retracted to lower the sand hopper 14, the squeeze feet 15, 15, and the filling frame 17 to the flask 19, while the first lifting rod 9b is extended from the first cylinder 9a to lift the pattern carrier 6 and the box-like frame 8 to the flask 19, to define a mold space by the sand hopper 14, the squeeze feet 15, 15, the filling frame 17, the flask 19, the pattern plate 5, and the box-like frame 8.
  • This stage is shown in Fig. 3 .
  • This mold space is shaped such that the concave and convex shape formed by the squeeze feet 15, 15 corresponds to the concave and convex shape of the pattern plate 5. While the extending operation of the first lifting rod 9b is started, the pattern carrier 6 is held by the second lifting member 9g via the operation of the pattern-carrier holding means 9h, 9h.
  • the molding sand S is blow-filled by low-pressure air from the sand-filling nozzles 16, 16 into the mold space, as shown in Fig. 4 .
  • the air for blow-filling at the low pressure is discharged from the aforementioned vent holes (not shown) formed in the filling frame and/or vent holes (not shown) of the pattern plate 5.
  • the upwardly-facing cylinders 2, 2 are then further retracted to lower the lifting and supporting frame 3 and the elements supported by it, while the filling-frame cylinders 18, 18 are retracted, to perform a primary squeeze of the molding sand until the bottoms of all the squeeze feet are at the same level (during the squeeze the hydraulic fluid for the squeeze feet is allowed to be discharged), while the sliding gate 10 is reversely operated to open the sand-feeding port 11, as shown in Fig. 5 .
  • the second lifting rod 9f of the second cylinder 9e is then extended to allow the pattern carrier 6 to slidably move upward via the second lifting member 9g and with the aid of the guide rods 7, 7, to lift the pattern plate 5, to perform a secondary squeeze. Accordingly, the level of the periphery of the surface of the pattern plate 5 comes to coincide with the level of the mating surfaces of the flask 19 (its bottom) and the box-like frame 8 (its top), as shown in Fig. 6 .
  • the second lifting rod 9f of the second cylinder 9e is then retracted to lower the pattern plate 5 via the second lifting member 9g, the pattern-carrier holding means 9h, 9h and the pattern carrier 6, to perform a demolding, as shown in Fig. 7 .
  • the demolding is carried out with the flask 19 being sandwiched between the filling frame 17 and the box-like frame 8.
  • the upwardly-facing cylinders 2, 2 are then extended to lift the sand hopper 14, the squeeze feet 15, 15, and the filling frame 17, while the first cylinder 9a is retracted to lower the pattern carrier 6 and the box-like frame 8, to allow the tight-flask mold M to be free to be transferred, as shown in Fig. 8 .
  • an amount of molding sand S is refilled in the sand hopper 14.
  • the pattern-carrier holding means 9h, 9h are deactivated, so that the holding of the pattern carrier 6 by the second lifting member 9g, via the pattern-carrier holding means 9h, 9h, is released.
  • the tight-flask mold M is then transferred by the roller conveyor 20, and an empty flask is transferred in, while the pattern changer 4 is rotated through 180 degrees to change the pattern plate 5 and the pattern plate 5A. Further, the squeeze feet 15, 15 are moved to form a concave and convex shape corresponding to the concave and convex shape of the pattern plate 5A. The operation explained above may be repeated.
  • a mold space is defined by the sand hopper 14, the squeeze means 15, 15, the filling frame 17, the flask 19, pattern plate 5, and the box-like frame 8.
  • the mold space (a space in which molding sand is filled) is defined by substantially one step.
  • the mold-producing cycle can be shorter than that when a mold space is conventionally formed, requiring two steps, namely, a step of placing a flask on a leveling frame and a step of placing a filling frame on the flask and lowering the squeeze feet to allow it to advance into the filling frame.
  • the contact of the bottom of the filling frame 17 with the top of the flask 19 coincides with the contact of the top of the box-like frame 8 with the bottom of the flask, although some time difference between the lowering operation of the sand hopper 14, the squeeze means 15, 15, and the filling frame 17 and the lifting operation of the pattern carrier 6 and the box-like frame 3 may be allowed.
  • the tight-flask mold M can be freely transferred.
  • the tight-flask mold can be freely transferred by substantially one step.
  • the mold-producing cycle can again be shorter than when a mold is conventionally free to be transferred, requiring two steps, namely, a step of allowing the roller device to come into contact with the flask and a step of lifting the flask to the upper stop end.
  • the disengagement of the bottom of the filling frame from the top of the flask coincides with the disengagement of the top of the box-like frame 8 from the bottom of the flask, although some difference of time between the lifting operation of the sand hopper 14, the squeeze means 15, 15, and the filling frame 17 and the lowering operation of the pattern carrier 6 and the box-like frame 8 may be allowed.
  • the two-stage lifting means 9 for lifting the pattern carrier 6 and the box-like frame 8 is disposed below the pattern carrier 6, which is located above the central part of the base 1 of the molding device, the aforementioned secondary squeeze is easily carried out even in the structure of the present invention, where the flask 19 is not moved vertically.
  • the two-stage lifting means 9 includes the first cylinder 9a having the first lifting rod 9b, the tip of which is connected to the first lifting member 9c, and includes the second cylinder 9e having the second lifting rod 9f, wherein the tip of the second lifting rod 9f is connected to the second lifting member 9g, and the second lifting rod 9f is disposed within the first lifting rod 9b of the first cylinder 9a.
  • the lifting means 9 can be a compact structure.
  • the flask 19 is sandwiched between the filling frame 17 and the box-like frame 8, with the flask 19 being in contact with rollers 20a, 20a of the roller conveyor 20, as in Fig. 3 .
  • the molding device of the invention is not limited to this structure.
  • the molding device may be provided with a flask-leveling mechanism (not shown). By using this flask-leveling mechanism the flask may be located above the rollers 20a, 20a by a small distance, for example, 5 mm, while being sandwiched between the filling frame 17 and the box-like frame 8.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
EP07012211A 2007-02-17 2007-06-21 Verfahren und Vorrichtung zur Herstellung von Formen für dichte Behälter Withdrawn EP1964626A1 (de)

Applications Claiming Priority (1)

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JP2007037239 2007-02-17

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EP1964626A1 true EP1964626A1 (de) 2008-09-03

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WO (1) WO2008099521A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5455161B2 (ja) * 2010-05-13 2014-03-26 新東工業株式会社 サンドカッター装置及び鋳型造型装置
JP5626639B2 (ja) * 2010-08-09 2014-11-19 新東工業株式会社 鋳型造型方法

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0195864A2 (de) * 1985-03-29 1986-10-01 Osborn Manufacturing Company Giessereiformmaschine und Verfahren
US4860817A (en) * 1988-01-14 1989-08-29 Georg Fischer Ag Apparatus for the compacting of granular molding materials
EP0900606A1 (de) * 1997-09-05 1999-03-10 Sintokogio, Ltd. Vorrichtung zur Herstellung von Sandformen
EP0995521A1 (de) * 1998-10-19 2000-04-26 Josef Mertes Giesserei-Formmaschine
WO2001032333A1 (fr) * 1999-11-04 2001-05-10 Sintokogio, Ltd. Dispositif et procede de moulage pour moule en sable
EP1184106A1 (de) * 2000-02-17 2002-03-06 Sintokogio, Ltd. Verfahren und vorrichtung zum befüllen mit giessereisand
EP1208928A1 (de) * 2000-04-21 2002-05-29 Sintokogio, Ltd. Druckgussmaschiene und modellabdruckträger
EP1222979A1 (de) * 2000-04-13 2002-07-17 Sintokogio, Ltd. Komprssionsverfahren für giess-sand und vorrichtung dafür
EP1240957A2 (de) * 2001-03-16 2002-09-18 Sintokogio, Ltd. Verfahren und Vorrichtung zum Verdichten von Formsand
JP2002346698A (ja) * 2001-05-29 2002-12-03 Sintokogio Ltd 無枠式水平割鋳型造型機における鋳物砂充填方法およびその装置
EP1433548A1 (de) * 2001-08-06 2004-06-30 Sintokogio, Ltd. Verfahren und system zur überwachung einer spritzgiessmaschine
JP2005007439A (ja) * 2003-06-19 2005-01-13 Sintokogio Ltd 鋳型造型方法
JP2005329469A (ja) * 2005-08-19 2005-12-02 Sintokogio Ltd パターンキャリア移載機構
JP2005334976A (ja) * 2005-08-29 2005-12-08 Sintokogio Ltd 鋳型の造型方法及び造型装置
EP1738847A1 (de) * 2004-04-21 2007-01-03 Sintokogio, Ltd. Verfahren zur herstellung einer sandform

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0195864A2 (de) * 1985-03-29 1986-10-01 Osborn Manufacturing Company Giessereiformmaschine und Verfahren
US4860817A (en) * 1988-01-14 1989-08-29 Georg Fischer Ag Apparatus for the compacting of granular molding materials
EP0900606A1 (de) * 1997-09-05 1999-03-10 Sintokogio, Ltd. Vorrichtung zur Herstellung von Sandformen
EP0995521A1 (de) * 1998-10-19 2000-04-26 Josef Mertes Giesserei-Formmaschine
WO2001032333A1 (fr) * 1999-11-04 2001-05-10 Sintokogio, Ltd. Dispositif et procede de moulage pour moule en sable
EP1149646A1 (de) * 1999-11-04 2001-10-31 Sintokogio, Ltd. Formvorrichtung und -verfahren für sandformen
EP1184106A1 (de) * 2000-02-17 2002-03-06 Sintokogio, Ltd. Verfahren und vorrichtung zum befüllen mit giessereisand
EP1222979A1 (de) * 2000-04-13 2002-07-17 Sintokogio, Ltd. Komprssionsverfahren für giess-sand und vorrichtung dafür
EP1208928A1 (de) * 2000-04-21 2002-05-29 Sintokogio, Ltd. Druckgussmaschiene und modellabdruckträger
EP1240957A2 (de) * 2001-03-16 2002-09-18 Sintokogio, Ltd. Verfahren und Vorrichtung zum Verdichten von Formsand
JP2002346698A (ja) * 2001-05-29 2002-12-03 Sintokogio Ltd 無枠式水平割鋳型造型機における鋳物砂充填方法およびその装置
EP1433548A1 (de) * 2001-08-06 2004-06-30 Sintokogio, Ltd. Verfahren und system zur überwachung einer spritzgiessmaschine
JP2005007439A (ja) * 2003-06-19 2005-01-13 Sintokogio Ltd 鋳型造型方法
EP1738847A1 (de) * 2004-04-21 2007-01-03 Sintokogio, Ltd. Verfahren zur herstellung einer sandform
JP2005329469A (ja) * 2005-08-19 2005-12-02 Sintokogio Ltd パターンキャリア移載機構
JP2005334976A (ja) * 2005-08-29 2005-12-08 Sintokogio Ltd 鋳型の造型方法及び造型装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"RECENT TRENDS IN GREENSAND MOULDING MACHINE DESIGN", FOUNDRY TRADE JOURNAL, INSTITUTE OF CAST METALS ENGINEERS, WEST BROMWICH, GB, vol. 166, no. 3453, 1 May 1992 (1992-05-01), pages 254,256,258,26, XP000267328, ISSN: 0015-9042 *

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JP2010519040A (ja) 2010-06-03
WO2008099521A1 (en) 2008-08-21

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