EP0017131A1 - Procédé et installation pour compacter un matériau de moulage - Google Patents

Procédé et installation pour compacter un matériau de moulage Download PDF

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Publication number
EP0017131A1
EP0017131A1 EP80101557A EP80101557A EP0017131A1 EP 0017131 A1 EP0017131 A1 EP 0017131A1 EP 80101557 A EP80101557 A EP 80101557A EP 80101557 A EP80101557 A EP 80101557A EP 0017131 A1 EP0017131 A1 EP 0017131A1
Authority
EP
European Patent Office
Prior art keywords
pressure
discharge opening
gas
molding material
cavity
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Withdrawn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
EP80101557A
Other languages
German (de)
English (en)
Inventor
Hans 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
Publication of EP0017131A1 publication Critical patent/EP0017131A1/fr
Withdrawn legal-status Critical Current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

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 is possible with simple technical means.
  • 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 a sudden introduction 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, whereby the relaxation to atmospheric pressure is sufficiently short.
  • 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.
  • a dome-shaped cover 8 is placed, the p latte together with the flask 3, the filling frame 4, and the model 1 form a cavity 10 degrees.
  • the invention is described below using a machine according to the explosion method, 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 serves for the controlled reduction of the pressure generated in the combustion chamber of the fuel mixture in the cavity 10.
  • 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 element 19 with a bore 25 is provided, 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 diaphragm 24 into the cavity, as a result of which the discharge opening 20 increases, so that the pressure can drop more quickly.
  • Curve a - b - c - d in FIG. 5 shows a pressure relief curve without measures according to the invention.
  • the pressure peak a which here is approximately 6 bar (absolute)
  • the pressure drops sharply in a hyperbole-like manner, whereby it decreases asymptotically approaches the horizontal.
  • 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 therefore in ge to some extent inflates again and leads to a loosening.
  • the quality of the molds was significantly 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 can lead to turbulence , and because the pressure drop in the area c - e is too fast, under 0.5 seconds. Therefore, it is also recommended that the release or the enlargement of the cross section of the discharge opening 20 is linear in time.
  • the spring 26 begins at point b in the diagram to push the aperture 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, the section b - e here being fairly linear over a period of about 1.5 seconds and about a tangent to the cure vein section a - b - c forms.
  • 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, and in Fig. 4 is a dart valve 37 is provided which is movable by means of cams, not shown, of a lifting cylinder or a 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 computer.
  • a central control system 39 or by a process computer.
  • other relaxation velocities can also be achieved which, for example, run towards zero in the area of point e.
  • the control system can also be designed so that the pressure curve is independent of the temperature of the wall, since it can heat up after longer operating times.
  • the sequence is, for example, in an explosion machine such 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 by means of the Ignition element 12 is ignited and thereby brought to the combustion.
  • a fuel for example natural gas
  • an oxidizing agent for example air or oxygen
  • the fuel mixture can also be generated before it is introduced into the cavity, as indicated in FIG. 4.
  • 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)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
EP80101557A 1979-04-04 1980-03-25 Procédé et installation pour compacter un matériau de moulage Withdrawn EP0017131A1 (fr)

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
EP0017131A1 true EP0017131A1 (fr) 1980-10-15

Family

ID=4249116

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101557A Withdrawn EP0017131A1 (fr) 1979-04-04 1980-03-25 Procédé et installation pour compacter un matériau de moulage

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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3025993A1 (de) * 1980-07-09 1982-01-28 Sintokogio, Ltd., Nagoya, Aichi Formverfahren und vorrichtung zur druchfuehrung des verfahrens
EP0062331A1 (fr) * 1981-04-02 1982-10-13 BMD Badische Maschinenfabrik Durlach GmbH Procédé et dispositif de compactage pneumatique de sable de moulage
WO1983002078A1 (fr) * 1981-12-11 1983-06-23 Landolt, Christoph Procede de fabrication de moulages a l'aide de sable de moulage ou d'un autre melange a base de particules de matiere premiere
GB2199523A (en) * 1986-11-25 1988-07-13 Doyle Ltd C F Compacting a moulding mixture by a pressurised gas wave
US5024161A (en) * 1984-06-25 1991-06-18 Georg Fischer Ag Molding apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2006861A6 (es) * 1988-03-21 1989-05-16 Lopez Foronda Fernandez Vicent Mejoras introducidas en campanas de aire para moldeo por onda expansiva.
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

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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3025993A1 (de) * 1980-07-09 1982-01-28 Sintokogio, Ltd., Nagoya, Aichi Formverfahren und vorrichtung zur druchfuehrung des verfahrens
EP0062331A1 (fr) * 1981-04-02 1982-10-13 BMD Badische Maschinenfabrik Durlach GmbH Procédé et dispositif de compactage pneumatique de sable de moulage
WO1982003348A1 (fr) * 1981-04-02 1982-10-14 Koebel Alfons Procede et dispositif de compactage pneumatique de sable de moulage
WO1983002078A1 (fr) * 1981-12-11 1983-06-23 Landolt, Christoph Procede de fabrication de moulages a l'aide de sable de moulage ou d'un autre melange a base de particules de matiere premiere
US5024161A (en) * 1984-06-25 1991-06-18 Georg Fischer Ag Molding apparatus
GB2199523A (en) * 1986-11-25 1988-07-13 Doyle Ltd C F Compacting a moulding mixture by a pressurised gas wave

Also Published As

Publication number Publication date
JPS56500362A (fr) 1981-03-26
WO1980002121A1 (fr) 1980-10-16
SU1019994A3 (ru) 1983-05-23
NO803671L (no) 1980-12-04
DK516380A (da) 1980-12-03
CH640757A5 (de) 1984-01-31
AU545573B2 (en) 1985-07-18
AU5989880A (en) 1980-10-22
BR8008172A (pt) 1981-03-31
ZA801794B (en) 1981-07-29

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

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19801202

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19820827

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TANNER, HANS