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WO1980002121A1 - Procede et dispositif pour comprimer la matiere d'un moule - Google Patents

Procede et dispositif pour comprimer la matiere d'un moule Download PDF

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Publication number
WO1980002121A1
WO1980002121A1 PCT/CH1980/000041 CH8000041W WO8002121A1 WO 1980002121 A1 WO1980002121 A1 WO 1980002121A1 CH 8000041 W CH8000041 W CH 8000041W WO 8002121 A1 WO8002121 A1 WO 8002121A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
discharge opening
gas
molding material
reaching
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.)
Ceased
Application number
PCT/CH1980/000041
Other languages
German (de)
English (en)
Inventor
K Fischer
H Tanner
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.)
Georg Fischer AG
Original Assignee
Georg Fischer AG
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 Georg Fischer AG filed Critical Georg Fischer AG
Priority to BR8008172A priority Critical patent/BR8008172A/pt
Publication of WO1980002121A1 publication Critical patent/WO1980002121A1/fr
Priority to DK516380A priority patent/DK516380A/da
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor

Definitions

  • the invention relates to a method for compacting molding material, in particular foundry molding material, according to the preamble of claim 1.
  • the invention also relates to a device for carrying out the method according to the preamble of claim 5.
  • Such processes have economic advantages over mechanical processes (shaking, tamping) because the production e.g. of casting molds or cores with simple technical means is possible.
  • a metered amount of molding material is simply poured onto the model or into a core box, after which a pressure surge of a gas compresses the molding material.
  • the pressure surge can be brought about either by an abrupt entry of a high-tension gas into the cavity or by a rapid combustion of combustible gases in the cavity. Vibrating and pressing devices can thus be omitted.
  • a good, homogeneous compression and hardness as well as a flat back of the mold should be achieved, especially in the model area, the relaxation to atmospheric pressure being sufficiently short.
  • FIG. 1 shows a vertical section through a first embodiment of a device according to the invention for compacting molding sand, with a control member in a gas discharge opening,
  • Fig. 4 is a partial section of a third embodiment
  • Fig. 5 is a pressure-time diagram.
  • FIG. 1 shows a model plate 1 with a model 2.
  • Two frames, a molding box or molding frame 3 and a filling frame 4 are in contact with the model plate 1, into which a metered amount of molding material 9 is poured onto the model 2. Then a hood-shaped cover 8 is placed, which together with the molding box 3, the filling frame 4, and the model plate 1 form a cavity 10.
  • the invention is described below with the aid of a machine using the explosion process, but it is of course applicable to all machines in which a gas pressure surge is generated.
  • a first line 11 for supplying a fuel and optionally a second line 13 for supplying an oxidizing agent extend through the upper part of the cover 8.
  • an ignition element 12 in the form of a spark plug is inserted between the lines 11 and 13. The explo- Sions-like pressure surge arises from the ignition of the fuel and is sufficient to compress the molding material 9 ready for casting.
  • a pressure control element 19 is installed in a gas discharge opening 20, which is used for the controlled reduction of the pressure generated in the cavity 10 during the combustion of the fuel mixture.
  • a discharge line 21 is connected to all discharge openings 20 and collects the exhaust gases.
  • a diaphragm 24 acted upon by a spring 26 of the self-controlling control member 19 is provided with a bore 25, which is arranged in the ' hood-like cover 8 (Fig. 1).
  • the spring 26 is enclosed by a bush 30 screwed in from the outside of the side wall 18 with a bore 31 and by the cover 24.
  • the pressure of the explosion first presses the diaphragm 24 against the spring action onto a sealing stop shoulder 32, so that only the bore 25 remains as a gas outlet opening through which the gas can escape.
  • the spring 26 presses the orifice 24 into the cavity, as a result of which the discharge opening 20 increases, so that the pressure can drop more quickly.
  • a curve of pressure relaxation without measures according to the invention is shown in curve a-b-c-d in FIG. 5.
  • the pressure peak a which here is approximately 6 bar (absolute)
  • the pressure initially drops sharply in a hyperbolic manner, whereby it approaches the horizontal asymptotically. It has been found that in the case of a sudden pressure drop according to the curve a - b - c - the tightness of the molding material is lower in certain areas than in the case of slow expansion, since the gas in the molding material relaxes too quickly and this thereby -
  • OM to some extent inflates again and leads to a loosening.
  • the quality of the molds was substantially improved for a given period of relaxation to atmospheric pressure during the enlargement of the discharge opening 20 of at least 0.5 seconds, preferably 1 second.
  • the dashed curves b-e and c-e of FIG. 5 show two of these pressure levels b and c, the curve c-e being poorly chosen since this creates a point of discontinuity at point c in the decrease in pressure, which leads to eddies can lead, and because the pressure decrease in the area c - e takes place too quickly, under 0.5 seconds. Therefore, it is also recommended that the release or the enlargement of the cross section of the discharge opening 20 takes place linearly over time.
  • the spring 26 begins at point b in the diagram to push the diaphragm 24 away, so that the exhaust gas passage area is gradually increased, whereby no kinking can occur.
  • the time span a - b should expediently be between 0.5 and 1.5 seconds, so that on the one hand a cycle time of, for example, 3 seconds can be maintained and, on the other hand, the gas can be relaxed too quickly.
  • the relaxation to atmospheric pressure runs along the curve a - b - e, with section b - e here being fairly linear over a period of about 1.5. Seconds and about a tangent to the course section a - b - c. Adjustment options for the pressure relief curve are provided by different bores 25, 31, springs 26 and spring lengths, for example a stronger spring would shift point b, at which the gas discharge opening is enlarged, to the left in the diagram.
  • the bore 25 in the panel 24 is not absolutely necessary. Without a hole, the aperture 24 is a sealing plate, e.g. can also be a rectangular, one-sided clamped metal sheet. The pressure drop across section a - b would then be somewhat less steep. The relaxation then takes place only as a result of cold walls of the cavity 10 and leaks between the parts 1, 3, 4, 8.
  • the cover 8 is a flat plate.
  • a shut-off valve 36 is arranged in the discharge opening .20 and in FIG. 4 a shock valve 37 is provided which can be moved by means of cams (not shown), a lifting cylinder or a toothed rack 38.
  • the movement speeds of the shut-off devices 36 and 37 can be controlled or regulated by a central control system 39 or by a process engineer. This can also be used to achieve other relaxation speeds, e.g. Going to zero in the area of point e
  • the control system can also be designed such that the pressure profile is independent of the temperature of the wall, since this can heat up after longer operating times.
  • the sequence is, for example, in the case of an explosion machine of the type that a fuel, for example natural gas, is introduced through the first nozzle 11 and an oxidizing agent, for example air or oxygen, is introduced into the cavity 10 through the second nozzle 13 and mixed to form a fuel mixture of the ignition element 12 is ignited and thereby brought to the combustion.
  • an oxidizing agent for example air or oxygen
  • the fuel mixture can also be generated before it is introduced into the cavity, as is indicated in FIG. 4. Or the atmospheric oxygen in the cavity 10 is sufficient for the combustion, then the nozzle 13 is unnecessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

La matiere du moule (9) est versee jusqu'a un niveau determine sur une plaque (1) portant le modele (2). Celui-ci est entoure d'une boite de forme (3) et d'un cadre de remplissage (4). La mise en place d'un couvercle (8) forme un espace creux (10) dans lequel une substance combustible est allumee. La combustion rapide produit une onde de pression qui comprime la matiere du moule. La detente du gaz sous pression ainsi produit peut etre commandee ou reglee au moyen d'un diaphragme ou d'un clapet, de facon qu'en un bref laps de temps un moule homogene et dense soit forme.
PCT/CH1980/000041 1979-04-04 1980-04-02 Procede et dispositif pour comprimer la matiere d'un moule Ceased WO1980002121A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BR8008172A BR8008172A (pt) 1979-04-04 1980-04-02 Processo e aparelho para o adesamento de material para moldes
DK516380A DK516380A (da) 1979-04-04 1980-12-03 Fremgangsmaade og apparat til komprimering af formmateriale

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3124/79 1979-04-04
CH312479A CH640757A5 (de) 1979-04-04 1979-04-04 Verfahren und einrichtung zum verdichten von formstoffen.

Publications (1)

Publication Number Publication Date
WO1980002121A1 true WO1980002121A1 (fr) 1980-10-16

Family

ID=4249116

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1980/000041 Ceased WO1980002121A1 (fr) 1979-04-04 1980-04-02 Procede et dispositif pour comprimer la matiere d'un moule

Country Status (10)

Country Link
EP (1) EP0017131A1 (fr)
JP (1) JPS56500362A (fr)
AU (1) AU545573B2 (fr)
BR (1) BR8008172A (fr)
CH (1) CH640757A5 (fr)
DK (1) DK516380A (fr)
NO (1) NO803671L (fr)
SU (1) SU1019994A3 (fr)
WO (1) WO1980002121A1 (fr)
ZA (1) ZA801794B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19957800B4 (de) * 1999-11-18 2004-03-11 Hottinger Maschinenbau Gmbh Verfahren zur Herstellung von Gussformen
DE202018107002U1 (de) 2018-04-12 2019-03-14 Krämer + Grebe GmbH & Co. KG Modellbau Vorrichtung zur Herstellung von Kernen aus Formstoff
DE102019116531B3 (de) * 2019-06-18 2020-03-26 Krämer + Grebe GmbH & Co. KG Modellbau Vorrichtung zur Herstellung von Kernen aus Formstoff

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3025993C2 (de) * 1980-07-09 1983-11-10 Sintokogio, Ltd., Nagoya, Aichi Formvorrichtung zur Explosionsverdichtung eines sandartigen Füllmaterials
JPS58500474A (ja) * 1981-04-02 1983-03-31 ベ−エムデ−・バ−ディッシェ・マシ−ネンファブリ−ク・ドゥルラッハ・ゲ−エムベ−ハ− 型砂の空気圧圧縮法及び装置
DE3149172A1 (de) * 1981-12-11 1983-06-30 Georg Fischer AG, 8201 Schaffhausen "verfahren zur herstellung von formkoerpern mittels gasdruck"
CH666426A5 (de) * 1984-06-25 1988-07-29 Fischer Ag Georg Formanlage.
GB8628132D0 (en) * 1986-11-25 1986-12-31 Doyle Ltd C F Compacting moulding mixture
ES2006861A6 (es) * 1988-03-21 1989-05-16 Lopez Foronda Fernandez Vicent Mejoras introducidas en campanas de aire para moldeo por onda expansiva.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1465342A (en) * 1921-02-28 1923-08-21 Donald J Campbell Automatic-exhaust-valve construction
US3170202A (en) * 1962-08-22 1965-02-23 Sr William J Huston Foundry process
FR2141235A5 (fr) * 1971-06-08 1973-01-19 Dynamit Nobel Ag
FR2197673A1 (fr) * 1972-08-31 1974-03-29 Huettenes Albertus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1465342A (en) * 1921-02-28 1923-08-21 Donald J Campbell Automatic-exhaust-valve construction
US3170202A (en) * 1962-08-22 1965-02-23 Sr William J Huston Foundry process
FR2141235A5 (fr) * 1971-06-08 1973-01-19 Dynamit Nobel Ag
FR2197673A1 (fr) * 1972-08-31 1974-03-29 Huettenes Albertus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19957800B4 (de) * 1999-11-18 2004-03-11 Hottinger Maschinenbau Gmbh Verfahren zur Herstellung von Gussformen
DE202018107002U1 (de) 2018-04-12 2019-03-14 Krämer + Grebe GmbH & Co. KG Modellbau Vorrichtung zur Herstellung von Kernen aus Formstoff
DE102019105819B3 (de) 2018-04-12 2019-10-02 Krämer + Grebe GmbH & Co. KG Modellbau Vorrichtung zur Herstellung von Kernen aus Formstoff
WO2020177832A1 (fr) 2018-04-12 2020-09-10 Kramer+Grebe Gmbh & Co. Kg Modellbau Dispositif et procédé pour produire des noyaux à partir d'une matière de moulage
DE102019116531B3 (de) * 2019-06-18 2020-03-26 Krämer + Grebe GmbH & Co. KG Modellbau Vorrichtung zur Herstellung von Kernen aus Formstoff

Also Published As

Publication number Publication date
NO803671L (no) 1980-12-04
BR8008172A (pt) 1981-03-31
ZA801794B (en) 1981-07-29
DK516380A (da) 1980-12-03
EP0017131A1 (fr) 1980-10-15
JPS56500362A (fr) 1981-03-26
AU5989880A (en) 1980-10-22
AU545573B2 (en) 1985-07-18
CH640757A5 (de) 1984-01-31
SU1019994A3 (ru) 1983-05-23

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