EP0316978A1 - Dispositif de moulage à porosité variable pour la fabrication de moules de fonderie en sable et son procédé de fabrication - Google Patents

Dispositif de moulage à porosité variable pour la fabrication de moules de fonderie en sable et son procédé de fabrication Download PDF

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Publication number
EP0316978A1
EP0316978A1 EP88202375A EP88202375A EP0316978A1 EP 0316978 A1 EP0316978 A1 EP 0316978A1 EP 88202375 A EP88202375 A EP 88202375A EP 88202375 A EP88202375 A EP 88202375A EP 0316978 A1 EP0316978 A1 EP 0316978A1
Authority
EP
European Patent Office
Prior art keywords
molding tool
pore
molding
mold
tool according
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.)
Granted
Application number
EP88202375A
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German (de)
English (en)
Other versions
EP0316978B1 (fr
Inventor
Walter Dipl.-Ing. Knöss
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.)
Metallwerk Plansee GmbH
Original Assignee
Metallwerk Plansee GmbH
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 Metallwerk Plansee GmbH filed Critical Metallwerk Plansee GmbH
Priority to AT88202375T priority Critical patent/ATE71862T1/de
Publication of EP0316978A1 publication Critical patent/EP0316978A1/fr
Application granted granted Critical
Publication of EP0316978B1 publication Critical patent/EP0316978B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/18—Plants for preparing mould materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • B22C9/123—Gas-hardening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/06—Core boxes

Definitions

  • the invention relates to a gas-permeable mold for producing casting and core molds from hardenable molding sand, as well as a method for its production and an advantageous use of such tools.
  • Molds made from molding sand are widely used in the manufacture of cast metal parts. These are solid or bowl-shaped shapes that can only be used once.
  • fine-grained molding sand is provided with hardenable binder additives, placed in a mold via a sand inlet opening and cured there.
  • the curing takes place thermally - high energy expenditure - or more recently alternatively also by means of reaction gases which are pressed under pressure through the molding sand in the molding tool.
  • the gas is pressed into the sand at the sand inlet opening and has to emerge from the mold through bores, nozzles or other channels and openings mechanically introduced into the mold wall.
  • DE 30 02 939 describes a molding tool with a wall into which ribs and slots of different dimensions are mechanically introduced. The reaction gas entering the molding sand through an inlet is drawn off through the slots.
  • the slots are sanding.
  • the production is very expensive and does not allow the production of a really close-knit network of slots and bores.
  • the reaction gas also flows through the sand only unevenly in this embodiment of a mold.
  • reaction gas is consumed in excess, that is, in much larger amounts than required by the stoichiometry of the desired reaction.
  • the object of the present invention is therefore to produce a mold with a wall which is homogeneously gas-permeable in the micro range.
  • the methods and techniques described at the outset are thus ruled out.
  • the object is to create, by means of a suitable combination of techniques known per se for the production of porous materials, a mold wall which has a suitable microporosity in its region adjacent to the molding sand and which overall has sufficient mechanical stability.
  • the molding tools produced in this way are intended to permit the production of casting molds from molding sand in large numbers, in particular also as a non-massive, shell-shaped casting mold.
  • the surface of the molding tool exposed to the molding sand must be particularly wear-resistant. Pore clogging by molding sand should no longer be a major cause of failure of the molding tool. Pores that may be blocked by molding sand have to regenerate with little effort, i. H. get exposed again.
  • the object of creating a gas-permeable molding tool is achieved according to the invention in that the tool is made of heteroporous, open-pored material, the wall of the mold has a first, adjacent to the molding sand fine-pore layer area of 0.2 - 2 mm thickness, from 75 - 95% theoretical material density and pore diameter ⁇ 50 microns, on which a second, massive area in shape a large-pore supporting skeleton with ⁇ 80% theoretical material density and an average pore diameter> 100 ⁇ m.
  • the molding tools include both casting and core forms, i. H. both molds for the production of solid and hollow cast parts.
  • metallic and / or ceramic materials and / or plastics come into consideration as materials for the mold wall.
  • Up to 60,000 sand molds can be produced in a single mold of known designs.
  • the sand is filled into the mold at high speed and under high pressure.
  • the wear requirements for the surface of the mold coming into contact with the molding sand are correspondingly high. This fact must be taken into account by the selection of the material for the fine-pored layer of the molding tool.
  • Wear-resistant steel grades as well as wear-resistant ceramics as well as metallic and non-metallic hard materials e.g. As silicon nitride, boron nitride, titanium carbide, titanium nitride, silicon carbide.
  • the heteroporous wall of the mold can be formed either by viscous, foamed and then solidified material or the wall is formed by means of powdered starting material to be solidified.
  • the layer of the mold wall that comes into contact with the molding sand can be formed by isostatically pressing powder onto a gage mold corresponding to the casting.
  • the powder, mixed with a volatile solvent, can be applied as a paste or sprayed onto the gauge.
  • Galvanic processes and gas deposition processes (PVD processes) for forming such layers have also proven successful.
  • the layer can be placed on the gauge shape in the form of a flexible metallic or ceramic film.
  • the flexibility of such foils is given by volatile, highly flexible thermoplastic components in solid form during subsequent heat treatment. Otherwise, the foils consist of powdery metals, hard materials or ceramics.
  • the gauge form covered with the layer material is then either foamed or, after embedding in a corresponding outer form, backfilled with coarse-grained powder material and preferably isostatically pressed.
  • the finished composite body is produced by thermal or chemical curing, firing or sintering of the compacted composite materials.
  • the open-pore support structure For the manufacture of the open-pore support structure, it has proven useful to first coat sand, glass or ceramic grains with a thin plastic layer by immersing them in appropriate dispersions or solutions. The granules pretreated in this way can be poured into a mold and / or pressed and then chemically or thermally cured.
  • Molding tools according to the present invention have a number of advantages.
  • the molding sand enclosed in the molding tool can be pressurized through the heteroporous wall when using the molding tools according to the invention.
  • the gas pressure and time it is possible to effect curing of the enclosed molding sand only in an edge zone to a desired depth.
  • An even finer dosage can be achieved by soaking the mold with a suitable liquid.
  • a defined capillary pressure builds up in the fine pores of the tool wall, which releases the reaction gas only when this pressure is exceeded.
  • the core of the enclosed sand remains free-flowing if the gas is dosed stoichiometrically and can be removed and reused after the edge zone has hardened through the sand inlet opening.
  • An essential advantage of molding tools according to the present invention lies in the possibility of their surface facing the molding sand adjust the desired mold, but the back surface with a few flat surfaces, e.g. B. cuboid or cylindrical. Due to the gas loading of the molding sand through the porous wall of the molding tool, a fine gas layer regularly forms between the wall of the molding tool and the molding sand. This prevents the molding sand from sticking to the mold wall during the sand curing process. The sand mold easily detaches from the mold after the hardening process. Special measures against the gluing of molding sand and molding tool (spraying the molding tool wall, inserting a film), as are required in known tools and processes for the production of casting molds, can therefore generally be avoided.
  • Figure 1 shows the design of a half-shell of a mold, in section, and devices for producing the mold according to a preferred method.
  • 1 shows the model plate -1- with the gauge shape for the half-shell of a molding tool.
  • the area of the model plate which gives off the sand inlet opening of the molding tool -1a- during later use is particularly marked.
  • a sealing plate -2- lies on the model plate or is screwed or clamped to it. It has a central recess according to the geometric shape of the one to be manufactured Molding tool.
  • the fine-pore layer area -3- of the mold adjoining the molding sand has a constant layer thickness over the entire surface area, with the exception of a narrow area at the separating surface of the two half-shells.
  • the open-pore support skeleton -4- is materially adjacent to the fine-pore layer area of the molding tool.
  • the external geometric shape of the mold is specified by a mold box -5- or mold frame screwed onto the model plate. Manufacturing variants are possible where the molding box is not completely filled with the material, but where an air space -6- remains between the supporting skeleton and the top of the molding box when filling in a flowable or spreadable material.
  • a model plate with the gauge shape of one half of the cast part to be manufactured is first produced from a metallic and / or ceramic material or from plastic by customary methods. In the majority of cases, it is advisable for core and casting molds to produce the mold from two half-shells. After previously applying a release agent, a sealing plate, preferably made of steel or ceramic, is applied to the model plate and screwed to the model plate. The central recess in the sealing plate is to be dimensioned such that in the area of the separating surface of the two half-shells of the mold between the gauge surface (model plate) and the sealing plate there remains a gap at least as thick as the fine-pored layer area of the mold.
  • the fine-pored layer of the molding tool is first applied to the gauge surface of the model plate - if necessary after applying a release agent on the gauge surface.
  • a paste is spread or sprayed on.
  • the paste consists of fine-grained, corrosion-resistant ceramic powder with an average grain size of 10 - 100 ⁇ m, which, to increase the surface wear resistance of the mold, has about 10 - 20% by volume titanium carbide powder (measured by the proportion of ceramic powder) same grain size are added.
  • the powder is processed into a paste with a volatile or thermally evaporable binder. If appropriate, non-volatile metallic and / or non-metallic components and / or pore formers are added to the binder.
  • the fine-pore layer is advantageously applied in several layers until the desired total layer thickness is reached.
  • the layer application according to FIG. 1 also takes place over the edge of the sealing plate.
  • the fine-pored layer applied in this way is dried or cured.
  • a molding box or molding frame according to FIG. 1 is screwed onto the model plate or sealing plate and the material for forming the wall area is introduced into the molding box with an open-pore support skeleton.
  • It is a coarse-grained ceramic powder to which volatile pore-forming materials have been added, such as are used, for example, in the production of porous ceramic filters.
  • the ceramic powder is mixed with volatile binders to form a paste, which is then brushed into the molding box and cured there.
  • the mold is then separated from the model plate and sintered or fired in high-temperature furnaces. In this way, wear-resistant, mountable mold half-shells with flat parting surfaces are obtained.
  • the mold surface does not require any surface treatment.
  • the area of the sand inlet opening of the mold is finally sealed with a pore filler, so that no reaction gas can pass through this area of the mold wall during later operation and the molding sand cannot harden in this area.
  • the testing of molds produced in this way with a wall structure according to the invention has shown that a pressure difference of 1-2 bar can be built up at the boundary between coarse and fine-pored layers.
  • the fluctuation range of the absolute gas pressure in front of the limit in the coarse-pored part of the wall in different sections of the mold wall or in different molds manufactured according to the same process is between 0.1 - 0.2 bar and is therefore largely independent of how thick the large-pored support skeleton of the mold wall is actually.
  • the said jump of the Gas pressure at the boundary between the coarse and fine-pored layer occurs practically solely due to the structure of the fine-pored layer.
  • This pressure jump can still be stabilized by impregnating the molding tool with a suitable sealing liquid, as a result of which a very homogeneous capillary pressure builds up in the pores of the fine-pored layer over the entire surface area of the molding tool.
  • the production of a casting mold from hardenable molding sand using a molding tool according to the present invention then proceeds as follows. After the molding sand has been filled in, the molding tool is pressurized with reaction gas from the outside at a pressure of> 2 bar. This presses the liquid out of the capillaries of the fine-pored layer of the molding tool and reaches the molding sand or an edge zone of the sand mold with precisely metered gas pressure.
  • the core area of the filled molding sand remains free-flowing. It can be removed and reused via the sand inlet after curing is complete. When the gas pressure drops below 2 bar, the barrier liquid is drawn back into the pores of the fine-pored layer by wicking. This means short production times for the individual sand molds as well as low susceptibility to faults and reject rates.
  • a jig mold or model plate is produced for a half-shell of a molding tool. Similarly to Example 1, a sealing plate is clamped onto the model plate.
  • the mold wall material for the fine-pored layer is placed on the gauge shape in the form of a flexible metallic foil.
  • the separately manufactured metallic foil consists of a homogeneous mixture of corrosion-resistant steel particles with a grain size distribution of 10 - 100 ⁇ m, possibly enriched with a few volume percent wear-resistant titanium carbide particles of comparable grain size, possibly supplemented by powdered fillers and pore-forming materials as well as a thermoplastic that evaporates at higher temperatures Plastic.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Earth Drilling (AREA)
  • Powder Metallurgy (AREA)
  • Mold Materials And Core Materials (AREA)
EP88202375A 1987-10-22 1988-10-20 Dispositif de moulage à porosité variable pour la fabrication de moules de fonderie en sable et son procédé de fabrication Expired - Lifetime EP0316978B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88202375T ATE71862T1 (de) 1987-10-22 1988-10-20 Heteroporoeses formwerkzeug zur herstellung von gussformen aus formsand und verfahren zu dessen herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3735751 1987-10-22
DE19873735751 DE3735751A1 (de) 1987-10-22 1987-10-22 Heteroporoeses formwerkzeug zur herstellung von gussformen aus formsand und verfahren zu dessen herstellung

Publications (2)

Publication Number Publication Date
EP0316978A1 true EP0316978A1 (fr) 1989-05-24
EP0316978B1 EP0316978B1 (fr) 1992-01-22

Family

ID=6338850

Family Applications (2)

Application Number Title Priority Date Filing Date
EP88908950A Pending EP0342209A1 (fr) 1987-10-22 1988-10-20 Outil heteroporeux de formage de moules de fonte en sable de moulage et son procede de fabrication
EP88202375A Expired - Lifetime EP0316978B1 (fr) 1987-10-22 1988-10-20 Dispositif de moulage à porosité variable pour la fabrication de moules de fonderie en sable et son procédé de fabrication

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP88908950A Pending EP0342209A1 (fr) 1987-10-22 1988-10-20 Outil heteroporeux de formage de moules de fonte en sable de moulage et son procede de fabrication

Country Status (8)

Country Link
US (1) US5190094A (fr)
EP (2) EP0342209A1 (fr)
JP (1) JP2851293B2 (fr)
KR (1) KR890701245A (fr)
AT (1) ATE71862T1 (fr)
DE (2) DE3735751A1 (fr)
ES (1) ES2029000T3 (fr)
WO (1) WO1989003736A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT518323A1 (de) * 2016-02-29 2017-09-15 Wienerberger Ag Pressform für Dachziegel

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6015518A (en) * 1994-11-02 2000-01-18 Unipor Ag Method of making a device for conducting a fluid between a space bounded by a fixed surface and a duct
US5686038A (en) * 1995-06-06 1997-11-11 The Boeing Company Resin transfer molding of composite materials that emit volatiles during processing
US5709893A (en) * 1995-06-06 1998-01-20 The Boeing Company Breathable tooling for forming parts from volatile-emitting composite materials
DE10326788B4 (de) * 2003-06-13 2005-05-25 Robert Bosch Gmbh Kontaktoberflächen für elektrische Kontakte und Verfahren zur Herstellung
US7416401B2 (en) * 2005-06-13 2008-08-26 The Boeing Company Lightweight composite fairing bar and method for manufacturing the same
DE102007001303B4 (de) * 2007-01-02 2008-09-18 Quadriga Gbmh Verfahren zur Herstellung eines Füllkörpers für einen Kernkasten
US8465607B1 (en) 2008-09-18 2013-06-18 The United States Of America As Represented By The Secretary Of The Navy Higher-performance solid-rocket propellants and methods of utilizing them
DE102017217096B3 (de) 2016-12-06 2018-03-22 Wolfram Bach Werkzeugeinsatz, Form- oder Kernwerkzeug sowie Verfahren zur Herstellung von Formen oder Kernen
DE202018106268U1 (de) 2018-11-04 2018-11-28 Wolfram Bach Werkzeug zur Herstellung von Formen oder Kernen durch elektrische Widerstandserwärmung eines kunststoffbasierten Materials
GB2600700B (en) * 2020-11-04 2023-07-12 Diageo Great Britain Ltd A system and method for forming a moulded article

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026049B (de) * 1956-11-08 1958-03-13 Heinz Eyckeler Dr Ing Form, Kernkasten oder Modellplatte aus luftdurchlaessigem Material
DE1070347B (fr) * 1959-12-03
US3101514A (en) * 1961-12-04 1963-08-27 Int Harvester Co Sintered powder metal mold
GB1043174A (en) * 1962-08-07 1966-09-21 Gruenzweig & Hartmann A core box and a method of producing the same
DE2437328A1 (de) * 1974-08-02 1976-02-12 Buderus Eisenwerk Giessereimodell

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DE1058226B (de) * 1958-03-08 1959-05-27 Rheinische Maschinenfabrik Form zur Herstellung von Formlingen fuer Giessereizwecke
US3550673A (en) * 1968-06-10 1970-12-29 Foundry Allied Ind Inc Polyurethane mold articles
DE2361820C3 (de) * 1973-01-29 1975-07-03 Eugen Dipl.-Ing. 8871 Burtenbach Buehler Verfahren und Vorrichtung zum Weitertransportieren eines aus horizontal geteilten kastenlosen Gießformen gebildeten Formstranges längs einer GIeB- und Kühlstrecke
JPS5414212A (en) * 1977-07-02 1979-02-02 Otani Moriyuki Circular magnetic card
JPS5852528B2 (ja) * 1979-04-10 1983-11-24 葛城産業株式会社 金属の多孔質焼結板状体およびその製造法
US4473526A (en) * 1980-01-23 1984-09-25 Eugen Buhler Method of manufacturing dry-pressed molded articles
DE3002939A1 (de) * 1980-01-28 1981-07-30 Gottfried 6335 Lahnau Zimmermann Duese zum entlueften, belueften oder bedampfen von formen
US4291740A (en) * 1980-05-28 1981-09-29 Anatol Michelson Apparatus and method for heatless production of hollow items, for instance, foundry shell cores
DE3039394C2 (de) * 1980-10-18 1987-04-02 Heinrich Wagner Maschinenfabrik GmbH & Co, 5928 Laasphe Unterdruckanschluß für vakuumverfestigte Gießformen
JPS57142798A (en) * 1981-02-26 1982-09-03 Nippon Piston Ring Co Ltd Powder molding method and molded article

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1070347B (fr) * 1959-12-03
DE1026049B (de) * 1956-11-08 1958-03-13 Heinz Eyckeler Dr Ing Form, Kernkasten oder Modellplatte aus luftdurchlaessigem Material
US3101514A (en) * 1961-12-04 1963-08-27 Int Harvester Co Sintered powder metal mold
GB1043174A (en) * 1962-08-07 1966-09-21 Gruenzweig & Hartmann A core box and a method of producing the same
DE2437328A1 (de) * 1974-08-02 1976-02-12 Buderus Eisenwerk Giessereimodell

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT518323A1 (de) * 2016-02-29 2017-09-15 Wienerberger Ag Pressform für Dachziegel
AT518323B1 (de) * 2016-02-29 2018-03-15 Wienerberger Ag Pressform für Dachziegel

Also Published As

Publication number Publication date
US5190094A (en) 1993-03-02
WO1989003736A1 (fr) 1989-05-05
EP0342209A1 (fr) 1989-11-23
DE3868014D1 (de) 1992-03-05
ES2029000T3 (es) 1992-07-16
JPH02501721A (ja) 1990-06-14
DE3735751A1 (de) 1989-05-03
ATE71862T1 (de) 1992-02-15
EP0316978B1 (fr) 1992-01-22
JP2851293B2 (ja) 1999-01-27
DE3735751C2 (fr) 1989-08-31
KR890701245A (ko) 1989-12-19

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