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EP2059356B1 - Moule de coulée perdu, monobloc, pouvant être tempéré, destiné a des éléments moulés en métal et procédé de fabrication du moule - Google Patents

Moule de coulée perdu, monobloc, pouvant être tempéré, destiné a des éléments moulés en métal et procédé de fabrication du moule Download PDF

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Publication number
EP2059356B1
EP2059356B1 EP07817442A EP07817442A EP2059356B1 EP 2059356 B1 EP2059356 B1 EP 2059356B1 EP 07817442 A EP07817442 A EP 07817442A EP 07817442 A EP07817442 A EP 07817442A EP 2059356 B1 EP2059356 B1 EP 2059356B1
Authority
EP
European Patent Office
Prior art keywords
mould
lost
moulding material
pattern
cooling channel
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.)
Not-in-force
Application number
EP07817442A
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German (de)
English (en)
Other versions
EP2059356A1 (fr
Inventor
Heiko Voigt
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
Original Assignee
ACTech GmbH
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Filing date
Publication date
Application filed by ACTech GmbH filed Critical ACTech GmbH
Publication of EP2059356A1 publication Critical patent/EP2059356A1/fr
Application granted granted Critical
Publication of EP2059356B1 publication Critical patent/EP2059356B1/fr
Not-in-force 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
    • B22C9/04—Use of lost patterns
    • 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
    • B22C7/02—Lost patterns
    • 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
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • B22D27/045—Directionally solidified castings

Definitions

  • the invention relates to a one-piece lost mold for castings made of metal and a method for their preparation.
  • a preferred application of one-piece lost molds for metal castings is the rapid and economical production of single castings or castings in small numbers, most of which are used as so-called prototypes.
  • Such prototype castings are used to verify the properties, eg. As the strength of more complex workpieces, which are standard z. B. to be produced by pressure or Kokilleng imagine compiler before making the permanent metal molds for mass production.
  • they In order to be able to realistically evaluate the prototype castings, they must correspond in their material properties to the later series product or come as close as possible.
  • Gypsum and ceramic molds are usually made using fusible wax models, sand molds using, for example, burnable or gasifiable foam polystyrene or plastic models. Due to the poor heat conduction of such molds made of gypsum, ceramic or foundry sand, the solidification times for the molten metal are relatively long, at least for larger wall thicknesses. Due to the slow solidification and cooling, depending on the metal to be cast, a relatively coarse-grained and therefore not always sufficiently load-bearing structure is often produced. Furthermore, by an unfavorable directional course of solidification in the individual areas of the mold and casting defects such. B. porosities or voids arise.
  • a number of casting molds and methods for making prototype castings having one-piece gypsum, ceramic or sand molds made using lost models are known in the art.
  • US 4579166 describes the application of the plaster casting technique for the testing of new machined parts, which could otherwise only be produced by pressure or chill casting.
  • the casting of such components by means of plaster casting technique is indeed well suited for the production of prototypes made of aluminum, zinc, magnesium and their alloys.
  • the prototypes produced therewith correspond only in their outer shape produced in a mold or die casting, and the casting of such parts of magnesium or its alloys without inert gas and without cooling is difficult.
  • the provision of a more or less porous plaster mold is recommended, which contains only a small amount of unbound and bound water after calcination.
  • the casting mold is protected from melt reactions by flooding the mold cavity with a protective gas.
  • This shielding gas contains sulfur or sulfur hexafluride (SF 6 ) as inhibiting agents.
  • SF 6 sulfur or sulfur hexafluride
  • a thermocouple is placed in the mold near the casting and the temperature monitored during the cooling of the casting to detect uncontrolled reactions in the mold in time and, for. B. to prevent impending explosions. An active control of the cooling to achieve a finer structure is not possible with such a shape.
  • Chilled plaster molds are disclosed in Japanese Laid-Open Publications JP 63168250 A1 and JP 02187236 A1 described.
  • a closure plate made of a plastic, which is burned out during curing of the plaster mold.
  • a cooling plate is used during casting in order to achieve local cooling of the casting mold.
  • a cooler is also inserted into a plaster mold.
  • a wax model consisting of a product part and a rotor part is inserted into an iron frame.
  • a pattern material having the same shape as the radiator is placed on the part in which the cooling speed in the product part is to be accelerated.
  • the plaster is filled in the space under the pattern material and the wax pattern as well as in the frame.
  • the whole is fired at about 700 ° C, whereby the wax pattern melts out.
  • the plaster mold is turned and the cooler used. Finally, the liquid metal is poured.
  • the present invention is therefore based on the object to develop a casting mold for metal castings for the production of single castings or castings in small quantities, in which controlled by the casting of the molten metal solidification to a cast body with respect to the direction and speed of solidification using a coolant can be. It is a further object of the present invention to develop a simple and inexpensive method for producing such a casting mold.
  • FIG. 1 schematically illustrated pattern or master model 1 provides the exact shape of a casting to be produced with a casting mold according to the invention for metal castings 4 4, which in FIG. 5 is shown.
  • a so-called master model 1 must first be produced.
  • the production of such a basic model 1 is usually carried out by means of stereolithography.
  • Other suitable methods are for. These include Selective Laser Sintering, Fused Deposition Modeling, Laminated Object Modeling and 3D Printing.
  • a master model 1 has to be recreated, if only one casting 2 is to be made, it should immediately be manufactured as a lost model of fusible wax, a low melting model alloy, a burnable plastic, or a plastic foam suitable for making the mold of the invention. If a sample of the casting to be produced is present or if the master model 1 is not already a lost model, a lost model must first be produced from the existing pattern or master model 1 to produce the casting mold according to the invention. This is done by molding the pattern or master model 1 in a mold box with liquid silicone, as shown in FIG FIG. 2 is recognizable.
  • the silicone mold 5 formed in this way is divided by cutting along a dividing plane 15, the pattern 1 is taken from the mold cavity formed and the silicone mold 5 is provided with a pouring and feeding system (not shown in detail). Thereafter, the silicone mold 5 is exactly assembled again in the mold box and z. B. poured with liquid wax (also not shown). After the solidification of the wax from the silicone mold a lost model 3 z. B. be removed from wax.
  • the mold material for the one-piece lost casting mold for metal castings 2 may also include binder-containing mold base material (eg quartz sand).
  • binder-containing mold base material eg quartz sand.
  • one-piece sand molds especially lost models of foam polystyrene are particularly suitable, which by foaming in a foam mold or by mechanical processing, for. As milling, a foam polystyrene block are produced.
  • the lost model 3 made in one way or another is made of wax, plastic (eg foam polystyrene) or a low melting model alloy for the purpose of making the invention one-piece lost mold for castings made of metal 4 at least partially encased with a flexible cooling duct 6.
  • plastic eg foam polystyrene
  • a low melting model alloy for the purpose of making the invention one-piece lost mold for castings made of metal 4 at least partially encased with a flexible cooling duct 6.
  • the selection of these critical areas can, for. B. done by simulation of the solidification processes (casting simulation) advantageous.
  • the lost model After sheathing the lost model 3 with the cooling channel 6, the lost model is embedded in a solidifiable molding material by providing a casting and feeding system 12.
  • the lost model 3 is a wax model and is used as a molding material plaster
  • the wax model is melted after solidification of the plaster mold.
  • the wax model is also melted after solidification of the molding material and then fired the ceramic form.
  • the lost model is a polystyrene foam or a plastic model and if a binder-containing molding base material is used as molding material
  • the one-piece lost casting mold according to the invention for castings made of metal 4, as described in US Pat FIG. 4 is shown ready for use after solidification of the binder-containing molding base material. The burnout or gasification of the lost model takes place in this case only during casting by the molten metal itself.
  • the metallic cooling channel 6 a metal material is selected which is resistant to the molten metal.
  • the metallic cooling channel 6 may be smooth-walled and have a round or oval cross-section.
  • the cooling channel 6 can be made smooth-walled and bent by means of bending tools to the lost model 3 with contact to the surface.
  • a flexible metal hose, a flexible metal corrugated pipe or a wound corrugated metal hose is used for the metallic cooling channel 6.
  • a flexible stainless steel corrugated hose can easily be wound around the lost model 3 with a small radius of curvature.
  • Such stainless steel corrugated hoses are manufactured in the form of a corrugated pipe or wound as Stahlwellschlauch.
  • the corrugation of the tube may have a wavy contour or a rectangular contour. Such contours allow the formation of narrow arches and create a relatively large cooling surface. At the same time they improve the heat exchange between the molten metal and the guided in the cooling channel 6 cooling medium.
  • the ends of the at least one cooling channel 6 are provided with connecting flanges 7, 8, which are each connected to a cooling medium feed 9, not shown, and a cooling medium discharge 10.
  • As cooling media are gaseous and liquid substances such. As air or cooling water used.
  • the quantity of heat supplied to the one-piece lost casting mold for metal castings 4 with the molten metal can not be released directly to the environment by convection and radiation, as in the case of a mold or a diecasting mold. Rather, according to the invention, the heat is intensively extracted via the cooling medium via the cooling channel 6 embedded in the molding material and exposed to the mold cavity or only slightly covered, in order to cool the solidifying casting 2 as quickly as possible.
  • the cooling and heat transfer fluids can be used with which the one-piece lost mold for castings made of metal 4 can be tempered before pouring. If the cooling is started at the latest when pouring the melt into the casting mold for metal castings 4, the melting of the melt at the cooling channel 6 can be avoided.
  • the mold materials used for the one-piece lost mold for castings made of metal 4 are poor heat conductors, via the uncovered and / or only slightly covered outer sides of the metallic cooling channel 6 to the mold cavity, the heat supplied with the molten metal through the existing heat gradient in the cooling channel 6 on derived the cooling medium become.
  • suitable arrangement of the at least one cooling channel 6 in the one-piece lost casting mold for castings made of metal 4 also a directional solidification can be effected and thus the formation of casting defects such as voids and porosities can be counteracted.
  • the casting 2 can be easily demolded after cooling.
  • the cooling channel 6 can be easily removed from the casting 2 together with the mold material of the lost casting mold for metal castings 4.
  • the casting parts 2 produced in the one-piece lost casting mold according to the invention for castings made of metal 4 have the same or very similar properties as can be achieved during casting in molds or die casting molds.
  • the one-piece lost casting mold according to the invention for castings made of metal 4 is therefore particularly suitable for producing prototypes of castings whose service properties, eg. B. whose strength before production of expensive mold or die casting molds are checked for mass production.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Claims (10)

  1. Moule de coulée perdu monobloc pour des éléments moulés en métal (4) en un matériau de moulage durci, qui entoure une cavité de moulage et présente au moins un canal de refroidissement métallique (6) noyé dans le matériau de moulage, qui transporte un fluide de refroidissement, caractérisé en ce que des segments de la face extérieure dudit au moins un canal de refroidissement métallique (6) vers la cavité de moulage sont découverts et/ou ne sont que peu couverts par le matériau de moulage.
  2. Moule de coulée pour des éléments moulés en métal (4) selon la revendication 1, caractérisé en ce que ledit au moins un canal de refroidissement (6) a des parois lisses et présente une section transversale ronde ou ovale.
  3. Moule de coulée pour des éléments moulés en métal (4) selon la revendication 1, caractérisé en ce que ledit au moins un canal de refroidissement métallique (6) est un tuyau métallique flexible, un tube ondulé métallique flexible ou un tuyau ondulé métallique bobiné.
  4. Moule de coulée pour des éléments moulés en métal (4) selon au moins une des revendications précédentes, caractérisé en ce que ledit au moins un canal de refroidissement métallique (6) est fabriqué en acier ou en acier allié.
  5. Moule de coulée pour des éléments moulés en métal (4) selon au moins une des revendications précédentes, caractérisé en ce que l'on utilise comme matériau de moulage du plâtre ou une masse céramique.
  6. Moule de coulée pour des éléments moulés en métal (4) selon au moins une des revendications 1 à 4, caractérisé en ce que l'on utilise comme matériau de moulage un matériau de moulage de base contenant un liant.
  7. Procédé de fabrication d'un moule de coulée perdu monobloc pour des éléments moulés en métal (4) selon au moins une des revendications 1 à 6, caractérisé par les étapes suivantes :
    - formation d'un modèle perdu (3),
    - enrobage de zones sélectionnées du modèle perdu (3) avec au moins un canal de refroidissement (6),
    - enfouissement du modèle perdu (3) enrobé par ledit au moins un canal de refroidissement (6) dans un matériau de moulage durcissable, en prévoyant un système de coulée et d'alimentation (12),
    - durcissement du matériau de moulage, et
    - fusion ou combustion ou gazéification du modèle perdu (3).
  8. Procédé selon la revendication 7, caractérisé en ce que le modèle perdu (3) est un modèle en cire, on utilise du plâtre comme matériau de moulage et on provoque la fusion du modèle en cire après le durcissement du moule de plâtre.
  9. Procédé selon la revendication 7, caractérisé en ce que le modèle perdu (3) est un modèle en cire, on utilise une masse céramique comme matériau de moulage, et on provoque la fusion du modèle perdu et la combustion du moule céramique après le durcissement du matériau de moulage.
  10. Procédé selon la revendication 7, caractérisé en ce que le modèle perdu (3) est un modèle en mousse de polystyrène ou en matière plastique, on utilise un matériau de moulage de base contenant un liant comme matériau de moulage, et on ne provoque la combustion ou la gazéification du modèle perdu que lors du moulage du métal en fusion lui-même.
EP07817442A 2006-09-05 2007-08-25 Moule de coulée perdu, monobloc, pouvant être tempéré, destiné a des éléments moulés en métal et procédé de fabrication du moule Not-in-force EP2059356B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006041627A DE102006041627A1 (de) 2006-09-05 2006-09-05 Einteilige verlorene Gießform für Gussteile aus Metall sowie Verfahren zu ihrer Herstellung
PCT/DE2007/001516 WO2008028455A1 (fr) 2006-09-05 2007-08-25 Moule de coulée perdu, monobloc, pouvant être tempéré, destiné a des éléments moulés en métal et procédé de fabrication du moule

Publications (2)

Publication Number Publication Date
EP2059356A1 EP2059356A1 (fr) 2009-05-20
EP2059356B1 true EP2059356B1 (fr) 2010-04-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07817442A Not-in-force EP2059356B1 (fr) 2006-09-05 2007-08-25 Moule de coulée perdu, monobloc, pouvant être tempéré, destiné a des éléments moulés en métal et procédé de fabrication du moule

Country Status (7)

Country Link
US (1) US20090133848A1 (fr)
EP (1) EP2059356B1 (fr)
JP (1) JP2010502443A (fr)
AT (1) ATE465832T1 (fr)
CA (1) CA2646675A1 (fr)
DE (2) DE102006041627A1 (fr)
WO (1) WO2008028455A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007023152A1 (de) * 2007-05-16 2008-11-20 Mtu Aero Engines Gmbh Verfahren zur Herstellung eines Gussteils, Gussform und damit hergestelltes Gussteil
FR3004366B1 (fr) * 2013-04-10 2021-04-30 Snecma Moule de fonderie monocristalline
CN109937016A (zh) * 2016-09-30 2019-06-25 苏尔莫迪克斯公司 包括泄放导引件的介入性球囊系统
CN110893453B (zh) * 2019-12-02 2024-02-27 中北大学 一种镁合金铸件石膏型精密铸造方法和装置
CN112427606A (zh) * 2020-10-21 2021-03-02 德盛镁汽车部件（芜湖）有限公司 一种布置在发动机缸盖生产线上的铸造模具
CN113600795B (zh) * 2021-06-30 2023-07-14 上海航天精密机械研究所 一种细化熔模铸件组织的铸造方法
CN114012071B (zh) * 2021-09-26 2023-09-15 芜湖泓鹄材料技术有限公司 基于风冷技术解决汽车冲压模具铸件型面异常的方法
CN119456959A (zh) * 2024-11-06 2025-02-18 贵州安吉航空精密铸造有限责任公司 一种用于不锈钢铸件顶注式浇筑的工装及方法
CN119282030A (zh) * 2024-11-28 2025-01-10 中国航发西安动力控制科技有限公司 一种异形件的砂型铸造装置及使用方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54138062A (en) * 1978-04-19 1979-10-26 Yamahito Kogure Super hard resin production and apparatus therefor
US4574451A (en) * 1982-12-22 1986-03-11 General Electric Company Method for producing an article with a fluid passage
US4579166A (en) * 1984-04-10 1986-04-01 Amax Inc. Magnesium alloy casting in plaster molds

Also Published As

Publication number Publication date
EP2059356A1 (fr) 2009-05-20
WO2008028455A8 (fr) 2008-05-02
ATE465832T1 (de) 2010-05-15
DE102006041627A1 (de) 2008-03-20
US20090133848A1 (en) 2009-05-28
CA2646675A1 (fr) 2008-03-13
DE502007003621D1 (de) 2010-06-10
WO2008028455A1 (fr) 2008-03-13
JP2010502443A (ja) 2010-01-28

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