EP0803303B1 - Procédé pour la production d'un moule - Google Patents

Procédé pour la production d'un moule Download PDF

Info

Publication number
EP0803303B1
EP0803303B1 EP97106203A EP97106203A EP0803303B1 EP 0803303 B1 EP0803303 B1 EP 0803303B1 EP 97106203 A EP97106203 A EP 97106203A EP 97106203 A EP97106203 A EP 97106203A EP 0803303 B1 EP0803303 B1 EP 0803303B1
Authority
EP
European Patent Office
Prior art keywords
molding sand
pattern
thin
plate
flask
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.)
Expired - Lifetime
Application number
EP97106203A
Other languages
German (de)
English (en)
Other versions
EP0803303A1 (fr
Inventor
Shigeo Oda
Ryoji Kanayama
Kuniyasu Mori
Kazuo Sugimoto
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
Priority claimed from JP12906196A external-priority patent/JP3266506B2/ja
Priority claimed from JP14077296A external-priority patent/JP3271740B2/ja
Application filed by Sintokogio Ltd filed Critical Sintokogio Ltd
Publication of EP0803303A1 publication Critical patent/EP0803303A1/fr
Application granted granted Critical
Publication of EP0803303B1 publication Critical patent/EP0803303B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing
    • B22C15/30—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing by both pressing and jarring devices
    • 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

Definitions

  • This invention relates to a method for producing a mold by pressing molding sand which is first put in a mold space defined by a pattern plate and a flask.
  • molding sand tends not to be well compacted at the part near lower peripheral (i.e., lower inner and outer side) surfaces of the mold and the inner side surface of the flask.
  • Japanese Patent A (KOKAI) 4-28453 discloses a method to compact molding sand, wherein a plurality of points on the molding sand are previously selected in a program, and wherein these points are successively pressed first by a single pressing rod that moves to the selected points, and then all the molding sand is pressed by a squeeze member.
  • a device to perform this method is complicated, and this method takes a lot of time to pre-compact the molding sand.
  • This invention is conceived in view of the above prior-art drawbacks. It aims to provide a method to sufficiently consolidate molding sand to produce a mold wherein the molding sand is also well consolidated at the lower part of it near the inner and outer side surfaces of a pattern and the inner side surface of the flask.
  • the method of the present invention includes pre-compressing molding sand in a mold space at the lower part of it near the side surfaces of the pattern and flask, where it tends to be not well consolidated, by inserting a thin-plate body or rod into the molding sand at the lower part near the side surfaces.
  • the method also includes pre-compacting the molding sand at the lower part of it (near the pattern plate) and/or consolidating all the molding sand.
  • Figs. 1 - 4 are vertical, sectional views of a molding machine to carry out a first embodiment of the method of the present invention.
  • Fig. 5 is a horizontal, sectional view taken along Arrow V-V in Fig. 3.
  • Fig. 6 is a horizontal, sectional view similar to Fig. 5, showing an alternative example of a thin-plate body.
  • Fig. 7 is a vertical, sectional view of a molding machine to carry out a second embodiment of the method of the present invention.
  • Fig. 8 is a horizontal, sectional view taken along Arrow VIII - VIII in Fig. 7.
  • Fig. 9 is a vertical, sectional view of a molding machine to carry out a third embodiment of the method of the present invention.
  • Fig. 10 is a horizontal, sectional view taken along Arrow X- X in Fig. 9.
  • a table 1 formed with a central opening 2 is disposed.
  • a circular pattern 23 formed with a large, central depression or pocket 26 (Figs. 3 and 5) is mounted on a pattern plate 20.
  • the pattern plate 20 is placed on the table 1 such that it bridges the opening 2 of the table 1.
  • the pattern plate 20 has a plurality of vent holes 21 provided with vent plugs 22. These vent plugs 22 communicate with the opening 2 of the table 1.
  • a flask 3 and a filling frame 4 are placed on the pattern plate 20.
  • the pattern plate 20, flask 3, and filling frame 4 define a mold space. Molding sand S is then put into the mold space, and the surface of it is leveled.
  • Fig. 2 the mold space is then sealingly covered with a covering member 5, which is connected by way of a valve 5A to a source P for supplying compressed air into the mold space.
  • the valve 5A is opened for a while, so that compressed air is introduced into the mold space.
  • the introduced air pre-compacts the molding sand S, especially its lower part close to the pattern plate 20, and is then evacuated from the vent plugs 22.
  • the covering member 5 is then removed.
  • a pre-compressing device or means comprised of a tubular thin-plate body 8 attached to a rigid plate 7, which in turn is attached to a piston rod 6 of a cylinder (not shown), is moved to a position just above the mold space.
  • the length of the thin-plate body 8 generally equals the total height of the flask 3 and filling frame 4.
  • the diameter of the body 8 is slightly less than that of the mold space.
  • the piston rod 6 is lowered so that the thin-plate body 8 is inserted into the molding sand S until the lower end of it reaches a part of the molding sand above the pattern plate 20. By this insertion the lower part of the molding sand near the inner side surface of the flask is well pre-compressed.
  • the thin-plate body 8 is then withdrawn from the molding sand S and moved away from the mold space.
  • the thin-plate body 8 is preferably 20 mm thick. If it were thicker, a void would be left in the surface of the molding sand S when the thin-plate body 8 is withdrawn from it.
  • a press plate 10 attached to a piston rod 9 of a cylinder (not shown) is pressed against the entire surface of the molding sand to thereby compact all the molding sand. This completes the process of producing a mold.
  • a thin-plate body 8A that has a plurality of metal strips and angles as in the drawing may be used.
  • an additional tubular thin-plate body 11 (shown in dotted lines), which has a diameter slightly less than the inner side surface 25 of the pattern 20, may be attached to the rigid plate 7 such that the lower end of the thin-plate body 11 reaches the lower part of the molding sand S near the inner side surface 25 of the pattern 20 as in Fig. 3 when the piston rod 6 is lowered.
  • the thin-plate body 11 well pre-compresses this part of the molding sand.
  • Figs. 7 and 8 a second embodiment of the method of the present invention is explained.
  • another method is used to pre-compress the lower part of the molding sand near the outer and inner side surfaces of a pattern and to consolidate all the molding sand.
  • the same numbers and letters are used for the same elements of the first embodiment, and similar numbers and letters for similar elements.
  • a pattern plate 20A (with no vent hole) is placed on a table 1A (with no opening).
  • a pattern 23A is mounted on the pattern plate 20A.
  • the pattern 23A is in the form of an almost square block and has a small, cylindrical central throughbore or pocket 26A.
  • the pattern plate 20A, flask 3, and filling frame define a mold space.
  • the device to pre-compact the molding sand includes a piston rod 6, a rigid plate 7 attached to it, and a thin-plate body 8 and a round bar or rod 11A, both attached to the rigid plate 7.
  • the diameter of the round rod 11A is slightly less than that of the pocket 26A.
  • molding sand is fed into the mold space, and the side surface of the molding sand is leveled.
  • the piston rod 6 is then lowered until the thin-plate body 8 and round rod 11A reach the lower part of the molding sand near the outer and inner side surfaces of the pattern 23A, respectively, as in Fig. 7.
  • the molding sand is well pre-compressed at the part near the side surfaces by the thin-plate body 8 and rod 11A.
  • the device is then moved away from the molding sand.
  • a covering member which is connected to means for supplying compressed air through a valve (such as the covering member 5, the valve 5A, and the means P of Fig. 2), is then sealingly attached to the top of the filling frame 4.
  • the valve is opened to introduce compressed air into the mold space to consolidate all the molding sand.
  • a mold is produced.
  • a third embodiment of the method to pre-compress the molding sand is shown. This method is similar to that of the second embodiment.
  • a pattern 23B and a thin-plate body 8B are circular in plan, but the inner side surface of the flask 3 is square.
  • the distance between the inner side surface of the flask and outer side surface of the pattern is great at the inner corners of the flask 3. Molding sand tends to be not well consolidated at these corners.
  • four more thin-plate bodies or angle rods 12 are attached to comers of the rigid plate 7 so that the lower part of the molding sand S near the inner side surface of the flask 3 is well pre-compressed.
  • the foregoing embodiments are exemplary only.
  • One or more of thin-plate bodies and/or rods may be selectively used depending on the part of the molding sand to be especially compressed and the shape of a pattern and a flask. Any other modification to or variation of the embodiments, or any combination of the embodiments, can be made within the scope of the appended claims.
  • the vent holes and vent plugs may be eliminated in the first embodiment.
  • pre-compacting by compressed air pre-compacting by the jolting process may be used.
  • molding sand is pre-compacted by compressed air before pre-compressing by a thin-plate body, this sequence may be changed.
  • the molding sand may be pre-compressed first by the thin-plate body and then be pre-compacted by compressed air.
  • the thin-plate body and/or rod is inserted into molding sand in the mold space by lowering it, instead of this, by a conventional method the molding sand in the mold space may be lifted to the fixed thin-plate body and/or rod.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)

Claims (4)

  1. Procédé de fabrication d'un moule comprenant une opération de consolidation de sable de moulage, comprenant les opérations consistant à :
    introduire du sable de moulage dans un volume de moule défini par un plaque de modèle (20) qui présente un modèle (23) et un chassis (3);
    déplacer la plaque de modèle (2) et un moyen (6, 7) pour pré-compresser le sable de moulage relativement proches l'un de l'autre, ledit moyen étant disposé au dessus du volume de moule, ledit moyen comprenant un corps (8, 11) en forme de plaque mince ou tige qui est latéralement espacé de la surface latérale intérieure du châssis (3) vers l'intérieur, et/ou est latéralement espacé des surfaces latérales intérieure et extérieure du modèle (23), de façon à introduire ladite au moins une plaque mince ou tige dans le sable de moulage (5) en pré-compressant ainsi le sable de moulage dans sa partie qui est proche de la plaque de modèle (20), et qui est proche d'au moins l'une de la surface latérale intérieure du châssis (3) et des surfaces latérales intérieure et extérieure du modèle (23);
    déplacer la plaque de modèle (20) et ledit moyen dans le sens les éloignant relativement l'un de l'autre de façon à retirer ledit au moins un corps en forme de plaque mince ou tige du sable de moulage; et, après le retrait,
    presser toute la surface du sable de moulage;
    caractérisé par une opération consistant à
    pré-compacter le sable de moulage introduit dans sa partie proche de la plaque de modèle (2), exécutée soit avant soit après l'opération de pré-compression.
  2. Procédé selon la revendication 1, dans lequel ladite opération de pré-compactage comprend l'application d'air comprimé au sable de moulage dans le volume de moulage.
  3. Procédé selon la revendication 1, dans lequel ladite opération de pré-compactage comprend un pré-compactage par le procédé à trépidation.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé par l'opération consistant à
    appliquer de l'air comprimé à la surface du sable de moulage pour ainsi compresser tout le sable de moulage.
EP97106203A 1996-04-24 1997-04-15 Procédé pour la production d'un moule Expired - Lifetime EP0803303B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP129061/96 1996-04-24
JP12906196A JP3266506B2 (ja) 1996-04-24 1996-04-24 鋳型造型方法
JP12906196 1996-04-24
JP14077296A JP3271740B2 (ja) 1996-05-10 1996-05-10 鋳型造型方法
JP140772/96 1996-05-10
JP14077296 1996-05-10

Publications (2)

Publication Number Publication Date
EP0803303A1 EP0803303A1 (fr) 1997-10-29
EP0803303B1 true EP0803303B1 (fr) 1999-09-01

Family

ID=26464579

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97106203A Expired - Lifetime EP0803303B1 (fr) 1996-04-24 1997-04-15 Procédé pour la production d'un moule

Country Status (7)

Country Link
EP (1) EP0803303B1 (fr)
KR (1) KR970073798A (fr)
CN (1) CN1071163C (fr)
DE (1) DE69700459T2 (fr)
ES (1) ES2138411T3 (fr)
ID (1) ID16815A (fr)
SG (1) SG52957A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011051420A1 (de) 2011-06-28 2013-01-03 Künkel-Wagner Prozesstechnologie GmbH Ausbilden einer kastengebundenen Sandform

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2151755T3 (es) * 1997-03-28 2001-01-01 Sintokogio Ltd Procedimiento y dispositivo para precompactar arena de moldeo.
JPH1177242A (ja) * 1997-09-05 1999-03-23 Sintokogio Ltd 鋳型造型装置
GB0611430D0 (en) * 2006-06-09 2006-07-19 Foseco Int Improved feeder element for metal casting
CN104759595B (zh) * 2015-03-31 2016-10-19 青岛意特机械有限公司 微震压实式造型机及其造型方法
CN107262674A (zh) * 2017-07-04 2017-10-20 湖南江滨机器（集团）有限责任公司 一种盐芯压模以及盐芯制造方法
CN108339951A (zh) * 2018-05-03 2018-07-31 临沂市卓杰机械有限公司 铸件大端型腔造型组件、自动造型机和造型工艺

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8702873L (sv) * 1987-07-15 1989-01-16 Hybe Maskin System Ab Anordning foer underpressning
JPH0428453A (ja) * 1990-05-18 1992-01-31 Sintokogio Ltd 鋳型造型方法および加圧圧縮装置
AU644702B2 (en) * 1990-12-14 1993-12-16 Sintokogio Ltd. Compressed air blowing apparatus for use in green sand mold molding facility
US5660221A (en) * 1995-06-16 1997-08-26 Sintokogio, Ltd. Apparatus and method for producing molds

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011051420A1 (de) 2011-06-28 2013-01-03 Künkel-Wagner Prozesstechnologie GmbH Ausbilden einer kastengebundenen Sandform
DE102011051420B4 (de) * 2011-06-28 2015-09-24 Künkel Wagner Germany Gmbh Ausbilden kastengebundener Sandformen und Sandform

Also Published As

Publication number Publication date
ID16815A (id) 1997-11-13
CN1071163C (zh) 2001-09-19
DE69700459D1 (de) 1999-10-07
KR970073798A (ko) 1997-12-10
SG52957A1 (en) 1998-09-28
EP0803303A1 (fr) 1997-10-29
CN1170646A (zh) 1998-01-21
DE69700459T2 (de) 2000-03-16
ES2138411T3 (es) 2000-01-01

Similar Documents

Publication Publication Date Title
EP0803303B1 (fr) Procédé pour la production d'un moule
US6499531B1 (en) Machine for producing flaskless moulds
EP0811445B1 (fr) Machine à mouler
GB2043507A (en) Moulding apparatus
EP0748663B1 (fr) Dispositif et procédé de préparation des moules
US20060008376A1 (en) Method and an apparatus for producing multi-level components by shock compression of powdered material
US5148851A (en) Method of charging sand and molding machine utilizing thereof
JP2759433B2 (ja) 鋳型列装置において粉末材料から鋳型を二方向に突き固める方法
JP3329691B2 (ja) 砂鋳型の造型方法及びその装置
CA1201272A (fr) Methode et dispositif pour degarnir un creux de moule du sable qu'il renferme
US5137091A (en) Process of producing molded body from green molding sand
US5601777A (en) Process for compressing granular material in a molding box
RU2172656C2 (ru) Устройство и способ изготовления литейных форм
JPS638728Y2 (fr)
CA1220014A (fr) Methode et dispositif de faconnage des moules de fonderie
JPH0428453A (ja) 鋳型造型方法および加圧圧縮装置
JPS6321577B2 (fr)
JPH091288A (ja) 鋳型造型方法及びその装置
JPH0367780B2 (fr)
JPS6239079Y2 (fr)
JPH0910892A (ja) 鋳型造型方法
JPH03146243A (ja) 鋳型造型装置
JPS6239081Y2 (fr)
JPH07150202A (ja) 粉末成形プレスのフィーダー
JP3262201B2 (ja) 鋳型造型方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT

17P Request for examination filed

Effective date: 19980109

17Q First examination report despatched

Effective date: 19980224

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT

REF Corresponds to:

Ref document number: 69700459

Country of ref document: DE

Date of ref document: 19991007

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: GUZZI E RAVIZZA S.R.L.

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2138411

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20010330

Year of fee payment: 5

Ref country code: FR

Payment date: 20010330

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20010423

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20010514

Year of fee payment: 5

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020415

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020416

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021101

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20020415

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20021231

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20030514

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050415