EP1749596B1 - Verfahren zur Herstellung einer Giessform aus einem Verbundformstoff für Giessereizwecke - Google Patents

Verfahren zur Herstellung einer Giessform aus einem Verbundformstoff für Giessereizwecke Download PDF

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Publication number
EP1749596B1
EP1749596B1 EP05016479A EP05016479A EP1749596B1 EP 1749596 B1 EP1749596 B1 EP 1749596B1 EP 05016479 A EP05016479 A EP 05016479A EP 05016479 A EP05016479 A EP 05016479A EP 1749596 B1 EP1749596 B1 EP 1749596B1
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EP
European Patent Office
Prior art keywords
foundry
mould
mould material
mold
procedure 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.)
Expired - Lifetime
Application number
EP05016479A
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German (de)
English (en)
French (fr)
Other versions
EP1749596A1 (de
Inventor
Rezo Dr.-Ing. Aliyev
Detlev Gantner
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.)
ACTech GmbH
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ACTech GmbH
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Filing date
Publication date
Application filed by ACTech GmbH filed Critical ACTech GmbH
Priority to EP05016479A priority Critical patent/EP1749596B1/de
Priority to DE502005000878T priority patent/DE502005000878D1/de
Priority to ES05016479T priority patent/ES2287844T3/es
Priority to DK05016479T priority patent/DK1749596T3/da
Priority to AT05016479T priority patent/ATE364462T1/de
Publication of EP1749596A1 publication Critical patent/EP1749596A1/de
Application granted granted Critical
Publication of EP1749596B1 publication Critical patent/EP1749596B1/de
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
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings

Definitions

  • the invention relates to a method for producing a casting mold from a composite molding material composed of various molding materials which are heat-resistant for the casting of metals and which have a different material composition or a different content of organic or inorganic binders.
  • molding materials are in particular compositions of heat-resistant molding compositions and core materials, which consist of a refractory mineral base material, usually quartz sand, and a binder system.
  • quartz sand is the predominant molding material due to its reasonable price, its frequency and its properties.
  • the largest part of the molding box or the core box is filled with a molding material of lesser value, the so-called filler or filler sand. It contains significantly less binder and allows significant cost reductions compared to filling the entire mold with high-quality molding material, as it is needed at the contact surface of the molding material to the liquid metal.
  • the disadvantage is that a model is needed for the production of a casting mold. The production of a model is associated with a further cost increase and a considerable amount of time. Besides that is limited the process to the production of molds consisting exclusively of foundry sand.
  • a method of making a lost mold from a composite molding material having a plaster mold embedded in a sand mold is known.
  • each of the production of a model is required.
  • a model is made of wax, which is placed in a container and potted with a gypsum slurry.
  • the plaster mold is subjected to primary and secondary calcination to harden the ceramic mold.
  • the plaster mold is embedded in the casting mold with foundry molding sand and subsequently the liquid metal is poured.
  • This procedure requires various time-consuming manufacturing steps for the manufacture of the sand mold and plaster mold models, which are associated with considerable expense. In particular, for the rapid production of prototypes, the proposed method is not suitable for this reason.
  • the individual molded part segments consist of one and the same foundry usual foundry sand, which is cured with a binder.
  • the individual segments with the mating surfaces are molded separately with a pattern device.
  • the mold-forming inner contour of the casting mold assigned to the respective segment is produced by direct milling of the molding material using CAD data.
  • the individual molding material segments are joined together after milling to form the mold and interconnected by means of locking elements.
  • the segments without forming inner contour can be advantageously made on stock. Due to the individual production, however, the molding segments are subject to tolerances that can adversely affect the assembly.
  • the invention aims at a rapid and inexpensive process for the production of a mold from a composite molding material for foundry, which is composed of various molding materials.
  • the invention solves the above problem by the production of a block-shaped composite molding material from different foundry mold materials and its subsequent mechanical processing.
  • a solid molded body of the foundry material A is first prepared, usually cuboid, which is enveloped by a powdery and pourable foundry mold material B, usually chemically bonded molding sand, which is connected after curing with the foundry material A and a positive fit Connection is received.
  • the positive embedding of the ceramic molding in the foundry sand can be done by means of projections or recesses or by a corresponding prismatic shape of the ceramic molding with conically extending side walls.
  • the negative contour of the casting is introduced into the area of the foundry mold material A, while in the area of the foundry mold material B only the sprue system and feeder system is introduced.
  • a separate CAD / CAM machining program for the machining of the mold cavity for the casting in the region of the foundry mold material A.
  • a second processing program for a removal process preferably a milling program for direct molding material milling, can accordingly be used.
  • the advantage of the proposed method is a mold made of a composite molding material of two different foundry mold materials, which has a different material composition corresponding to the desired casting quality.
  • the different material composition may be characterized by a different content of binders or by the composition of the foundry molding material used.
  • Particularly advantageous is a composite molding material in combination of conventional foundry sand for the foundry mold material B with ceramic materials for the foundry mold material A.
  • the ceramic material contains only the casting geometry.
  • FIG. 1 shows one of the casting mold halves which together with the counterpart, not shown, together form a casting mold for a metallic casting.
  • the mold cavity 1 of the casting is thereby imaged by a molded body 2, which is made entirely of a ceramic foundry mold material A.
  • the molded body 2 forms with a molding material block 3 of a foundry mold material B a block-shaped composite molding material.
  • a piece of the sprue system 4 and the feeder system 5 is visible.
  • the mold is a two-part mold, for example with a top and a bottom.
  • the mold may consist of several parts, e.g. still made of cores.
  • core marks 6 can be easily incorporated into the mold halves.
  • a composite molding material corresponding to the respective mold half is produced, which contains a shaped body 2 made of a ceramic foundry mold material A.
  • a prismatic molded body 2 is first produced, which substantially corresponds to the dimensions of the actual casting, except for the sprue system 4 and feeder system 5.
  • the ceramic body 2 is made in final strength using a foundry material A suitable for abrasive machining by a method such as milling, drilling, turning, grinding or erosion is suitable and meets the casting requirements in terms of heat resistance and the reaction resistance to the casting material.
  • the ceramic molded body 2 from the foundry mold material A with a powdery and pourable, chemically bound foundry mold material B is wrapped, whereby the molding material block 3 is formed.
  • the sprue system 4 and the feeder system 5 are substantially integrated.
  • the molding 2 is to be positively connected to the enveloping chemically hardening foundry molding material B.
  • the positive connection can be effected by means of projections or recesses or by a corresponding prismatic shape of the shaped body 2 with conically extending side walls 7.
  • a quartz sand foundry molding sand is used with a thermosetting binder for wrapping the ceramic molded body 2.
  • the casting mold is heated to a temperature above the melting temperature of the binder during block molding with the introduced foundry sand - binder - mixture and the molding material block 3 cured.
  • the molded body 2 of the foundry mold material A with the molding material block 3 from the foundry mold material B forms a composite molding material which can be machined in one clamping by a machining process with a corresponding machine tool by milling, drilling, turning or grinding.
  • the invention should not be limited to a foundry mold material B with a thermosetting binder. Rather, bentonites can be used in the context of the patent claims as a binder for foundry molding sand.
  • binders for example, water glass or furan resins and other products of organic chemistry are applicable.
  • cement can be successfully used as a hardening binder. It is also possible to use a foundry mold material which has an addition of gypsum as binder.
  • binders can be used which subsequently enable the machining of the casting system with erosive methods.
  • the machining of the sprue system 4 and of the feeder system 5 takes place in a further working step, which can be carried out particularly advantageously when using foundry molding sand by direct molding material milling with a CNC milling machine.
  • the production of the mold cavity 1 for the casting is also carried out with a CNC machine tool.
  • CAM systems are used which make manual programming superfluous.
  • the development work in the production of prototypes is reduced to the tailor - made design within a CAD system.
  • Such systems are independent of the complexity of the casting and allow different machining instructions for milling strategies and other abrasive methods.
  • the production of the prototypes is thus based directly on the 3D datasets of the cast raw part, from which the datasets for the mold cavity 1 are generated.
  • the construction of the cavity for the sprue system 4 and the feeder system 5 is made from the raw part data of the casting, from which the datasets for the sprue system 4 and the feeder system 5 are made.
  • the milling program is created with the NC data derived from it using the tool specifications.
  • Advantageous is the possibility of using a special milling strategy for the production of the sprue system 4 and the feeder system 5 when using a resin bonded foundry sand.
  • a foundry mold material A which is optimal for the casting can be selected, while the foundry mold material B simplifies the mechanical processing or better satisfies other boundary conditions. Accordingly, for the mold cavity 1, the sprue system 4 and for the feeder system 5, the most favorable milling strategy can be selected separately.
  • This method can also be used for castings with a complicated geometry. In this way, the invention enables the production of faster prototypes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
EP05016479A 2005-07-29 2005-07-29 Verfahren zur Herstellung einer Giessform aus einem Verbundformstoff für Giessereizwecke Expired - Lifetime EP1749596B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP05016479A EP1749596B1 (de) 2005-07-29 2005-07-29 Verfahren zur Herstellung einer Giessform aus einem Verbundformstoff für Giessereizwecke
DE502005000878T DE502005000878D1 (de) 2005-07-29 2005-07-29 Verfahren zur Herstellung einer Giessform aus einem Verbundformstoff für Giessereizwecke
ES05016479T ES2287844T3 (es) 2005-07-29 2005-07-29 Metodo para la fabricacion de un molde de vidrio a partir de un material de moldeo compuesto para fines de vidrieria.
DK05016479T DK1749596T3 (da) 2005-07-29 2005-07-29 Fremgangsmåde til fremstilling af en stöbeform af sammensat formmateriale og til stöberiformål
AT05016479T ATE364462T1 (de) 2005-07-29 2005-07-29 Verfahren zur herstellung einer giessform aus einem verbundformstoff für giessereizwecke

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05016479A EP1749596B1 (de) 2005-07-29 2005-07-29 Verfahren zur Herstellung einer Giessform aus einem Verbundformstoff für Giessereizwecke

Publications (2)

Publication Number Publication Date
EP1749596A1 EP1749596A1 (de) 2007-02-07
EP1749596B1 true EP1749596B1 (de) 2007-06-13

Family

ID=35431839

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05016479A Expired - Lifetime EP1749596B1 (de) 2005-07-29 2005-07-29 Verfahren zur Herstellung einer Giessform aus einem Verbundformstoff für Giessereizwecke

Country Status (5)

Country Link
EP (1) EP1749596B1 (da)
AT (1) ATE364462T1 (da)
DE (1) DE502005000878D1 (da)
DK (1) DK1749596T3 (da)
ES (1) ES2287844T3 (da)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2804645C (en) 2010-08-09 2018-10-30 Synthes Usa, Llc Method for manufacturing an injection molded product
DE102021122520A1 (de) 2020-08-31 2022-03-03 Mikromat Gmbh Verfahren und Vorrichtung zur Entwicklung und/oder Herstellung von Gussbauteilen

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104347A (en) * 1974-11-19 1978-08-01 Kubota, Ltd. Method of making a sand mold
JPS61172650A (ja) * 1985-01-29 1986-08-04 Mitsubishi Heavy Ind Ltd 鋳型造型方法
JPS61245942A (ja) 1985-04-22 1986-11-01 Honda Motor Co Ltd 金型の製造方法
GB8726967D0 (en) * 1987-11-18 1987-12-23 D Sa R Production of castings
JP3114159B2 (ja) * 1995-11-29 2000-12-04 株式会社荏原製作所 鋳型製造方法
DE19825448C2 (de) * 1998-06-06 2000-07-13 Actech Gmbh Adv Casting Tech Verfahren und Vorrichtung zum direkten Herstellen einer verlorenen Gießform für Gußstücke aus Metall
US6286581B1 (en) * 1999-07-28 2001-09-11 Ronald Gustafson Method for machining sand block into sand molding elements including sand molds and sand cores for metal casting foundry operations
DE10242191B4 (de) * 2001-09-27 2009-02-05 Actech Gmbh Verfahren für die Herstellung von hitzebeständigen Gießformen
DE10156332B4 (de) * 2001-11-19 2005-09-15 Actech Gmbh Advanced Casting Technologies Giessereitechnologie Verfahren und Baukastensystem für die schnelle Herstellung von Giessformen
JP3533444B2 (ja) * 2001-12-10 2004-05-31 サカキバラモデル株式会社 鋳造用原型製造方法及び原型用親型
EP1334785A1 (en) * 2002-02-07 2003-08-13 X-Tend ApS A method of machining a mould from a block of sand and use of said method
DE10247715B4 (de) * 2002-10-12 2004-09-30 Actech Gmbh Advanced Casting Technologies Giessereitechnologie Mehrschneidiges Fräswerkzeug mit Schneidplatten für das direkte Formstoff-Fräsen

Also Published As

Publication number Publication date
DE502005000878D1 (de) 2007-07-26
EP1749596A1 (de) 2007-02-07
DK1749596T3 (da) 2007-10-08
ATE364462T1 (de) 2007-07-15
ES2287844T3 (es) 2007-12-16

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