EP2686121A1 - Formverfahren nach der technik der verlorenen form mit erzeugung von selbstformenden kühlern - Google Patents

Formverfahren nach der technik der verlorenen form mit erzeugung von selbstformenden kühlern

Info

Publication number
EP2686121A1
EP2686121A1 EP12713215.7A EP12713215A EP2686121A1 EP 2686121 A1 EP2686121 A1 EP 2686121A1 EP 12713215 A EP12713215 A EP 12713215A EP 2686121 A1 EP2686121 A1 EP 2686121A1
Authority
EP
European Patent Office
Prior art keywords
container
filling
thermosetting
lost
cooler
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
EP12713215.7A
Other languages
English (en)
French (fr)
Other versions
EP2686121B1 (de
Inventor
Guillaume MALHERBE
Christian BISSIEUX
Patrick Beauvais
Pascal BRENOT
Jean-Paul CHOBAUT
Patrick PRIOT
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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 Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP2686121A1 publication Critical patent/EP2686121A1/de
Application granted granted Critical
Publication of EP2686121B1 publication Critical patent/EP2686121B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • 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
    • B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
    • 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

Definitions

  • the invention relates to the field of foundry and, more particularly, to the field of processes using a lost model. It relates to a method for obtaining a cast metal part from a lost model.
  • the document FR 2,685,229 (Automobiles Kunststoff and Automobiles Citro ⁇ n) describes a process for obtaining metal parts from a lost model.
  • one or more models made of a sublimable material are placed in a container, the whole is embedded in sand leaving behind the casting conduits communicating at their upper part with a pouring cup and pouring liquid metal. through the tapping bucket.
  • the lost model is sublimated when the liquid metal comes to replace it.
  • the liquid metal solidifies on cooling so that the desired metal piece is obtained.
  • Refrigerating elements have been placed in the container in such a way that they are in contact with the bearing faces of the lost model which correspond to zones of the metal part of which a coefficient of elongation must be important.
  • the metal part thus obtained nevertheless has the disadvantage of having a structure of the material which is insufficiently thin.
  • such a metal part has a porosity rate which is important, which is detrimental. It follows that such metal parts have mechanical characteristics that deserve to be improved.
  • such a metal part is inhomogeneous with regard to its structure, its compactness and its mechanical characteristics due to the fact that the cooling elements are not in contact with free faces of the lost model which offer characteristics degraded with respect to the faces against which the cooling elements are positioned.
  • the object of the present invention is to propose a method for obtaining a cast metal part from a lost model, the method making it possible to control and accelerate solidification of the cast metal part, the latter having a fine structure, low porosity and improved mechanical characteristics, particularly with regard to a coefficient of elongation of the metal part thus obtained.
  • Another object of the present invention is to provide such a method for obtaining parts having a complex geometry, including nooks, for a modest cost.
  • a method of the present invention is a method for obtaining a metal part from a lost model disposed inside a container.
  • the method comprises a step of filling the container with a filling material.
  • the method comprises a step of introducing a thermosetting element in contact with at least one free face that comprises the lost model.
  • the step of introducing the thermosetting element is prior to the step of filling the container with the filling material.
  • the step of introducing the thermosetting element is subsequent to the step of filling the container with the filling material.
  • the method advantageously comprises a step of placing at least one cooler against a bearing surface that includes the lost model, the step of placing the cooler being prior to the step of filling the container with the material filling.
  • the step of placing the cooler is for example prior to the step of introducing the thermosetting element.
  • the step of placing the cooler is for example subsequent to the step of introducing the thermosetting element.
  • the method advantageously comprises a step of admitting a phase-change element in contact with the thermosetting element, the step of admitting the phase-change element being subsequent to the introduction step of the thermosetting element.
  • thermosetting element is advantageously able to solidify consecutively to a step of delivering a molten metal inside the container.
  • thermosetting element is preferably composed of a base material coated with a thermosetting resin and a catalyst.
  • the base material is at least one of sand, metal and a metal alloy.
  • Fig.1 to Fig.4 are schematic sectional illustrations of a container for implementing respective variants of a method according to the present invention.
  • Fig.5a to fig.5f, fig.6a to fig.6c, fig.7a and fig.7b, fig.8a to fig.8c, fig.9a to fig.9c, fig. l Oa and fig. 1b and 1b are respective schematic illustrations of alternative embodiments of the method according to the present invention.
  • a container 1 is provided to house at least one lost model 2.
  • the lost model 2 is of shape and dimension identical to a metal part that we wish to obtain.
  • the lost model 2 is made of a fusible material, such as wax, polystyrene or the like.
  • the lost model 2 is embedded inside a filling material 3, such as silica sand or the like, which partially completes the lost model 2 to fill the container 1.
  • the container 1 houses a filling system also made of fuse material.
  • the container 1 is preferably provided with a device capable of delivering vibrations for packing the filling material 3 around the lost model 2.
  • Molten metal 4 for example aluminum or the like, is cast so as to replace the lost model. 2 by sublimating the latter.
  • the filling system is able to guide the molten metal 4 from a reserve external to the container 1 to the lost model 2. This gives the desired metal part after solidification of the molten metal 4.
  • the metal part obtained is for example a cylinder head intended to be used on a combustion engine of a motor vehicle, however the metal part obtained from the implementation of the present invention is likely to be any metal part.
  • a cooler 5 is interposed between at least one bearing surface 6 of the lost model 2 and the filling material 3.
  • the cooler 5 is for example made of metal material.
  • the bearing face 6 and the cooler 5 are preferably planar.
  • the cooler 5 is intended to facilitate cooling of the molten metal 4 during solidification.
  • the cooler 5 is intended to accelerate the cooling of the bearing surface 6 of the lost model 2 with which the cooler 5 is in contact.
  • the cooler 5 is likely to comprise at least one coil traversed by a coolant, such as water or the like.
  • the cooler 5 advantageously constitutes a support element of the lost model 2 and / or the metal part obtained.
  • the method of the present invention aims to bring into contact at least one free face 8 of the lost model 2 with a thermosetting element 7 prior to the casting of the molten metal 4.
  • the contacting of the face 8 free with the thermosetting element 7 takes place before or after an introduction of the lost model 2 inside the container 1.
  • the free face 8 is any face of the lost model 2, the free face 8 is nevertheless distinct from a bearing face 6.
  • the free face 8 is a concave face optionally comprising one or more recesses.
  • the free face 8 is for example a compression side of a cylinder head of the heat engine mentioned above.
  • the free face 8 is for example bordered by the bearing face 6.
  • the thermosetting element 7 is preferably made of a base material, of granular shape, which is coated with a thermosetting resin and a catalyst for curing the thermosetting resin under the effect of a heat source.
  • the base material is for example a sand, a shot and / or needles made from a metal and / or a metal alloy comprising tin, zinc, copper, steel, zircon, chromite or the like.
  • the base material is indifferently a phase change material or not.
  • thermosetting element 7 advantageously constitutes a shell which at least partly envelops the lost pattern 2 by covering the free face 8.
  • thermosetting element 7 is interposed between the free face 8 of the lost model 2 and a phase-change element 11 which is provided to increase heat consumption from the molten metal 4, and thus to facilitate cooling of the free face 8.
  • the phase change element 1 1 is indifferently a solid-liquid phase change element, a liquid-gas phase change element or a solid-gas phase change element.
  • the thermosetting element 7 forms a screen between the lost model 2, or the metal part obtained, and the phase-change element 11 so that the nature of the phase-change element is capable of be any such as water, liquid nitrogen, a foundry binder or the like.
  • thermosetting element 1 1 in contact with the thermosetting element 7 allows an acceleration of the cooling of the free face 8, from a phase change operated by the phase change element 1 1 .
  • a filling device makes it possible to feed the thermosetting element 7 and / or the phase-change element 11 from the outside of the container 1 to a filling volume 9 adjacent to the free face 8 of the lost element. 2.
  • the filling device is indifferently a device for delivering the thermosetting element 7 and / or the phase-change element 11 by natural flow and / or by injection. According to the variants illustrated in FIG. 2 and FIG. 4, the filling device comprises at least one channel 10 through which the cooler 5 passes to enable the thermosetting element 7 and / or the element to be placed in position.
  • phase change 1 1 between the lost model 2 and the cooler 5 is formed through the cooler 5 at the level of the free face 8 and communicates with the filling volume 9.
  • the latter is advantageously bordered by the support surface 6 of the lost model 2 so as to prevent escape of the element thermosetting 7 and / or the phase change element 1 1 out of the filling volume 9. This prevention is facilitated by a flatness of the support face 6 and the cooler 5.
  • the implementation of such a method allows to cumulate the respective advantages of a metal shell gravity molding and a lost model process. More particularly, the metal part obtained has a structure and high mechanical characteristics and equivalent to those of a metal part obtained by a shell process, especially with regard to a coefficient of elongation of the part.
  • Such a method makes it possible to obtain metal parts having a complex geometry, in particular with concave zones having, for example, recesses.
  • Such a method offers a manufacturing cost which is advantageously low and little higher than the lost model method of the prior art.
  • Such a method also allows optimized production flexibility on an assembly line, for a modest investment compared to a lost mold process of the prior art and minimizing environmental pollution.
  • the method of the present invention comprises:
  • the method comprises successively:
  • the method comprises successively:
  • the method comprises successively:
  • the method comprises successively:
  • the method comprises successively an installation step O of the model lost inside the container 1,
  • the method comprises successively:
  • the method of the present invention comprises:
  • the method comprises successively:
  • the method comprises successively:
  • the method comprises successively:
  • the method of the present invention comprises:
  • the method successively comprises:
  • the method comprises successively:
  • the method of the present invention comprises:
  • the method of the present invention comprises successively:
  • the method of the present invention comprises successively:
  • the method of the present invention comprises successively:
  • the method of the present invention comprises:
  • the method comprises successively:
  • the method comprises successively:
  • the method comprises successively:
  • the method of the present invention comprises:
  • the method comprises successively:
  • the method comprises successively:
  • the method comprises successively:
  • the method comprises successively:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP12713215.7A 2011-03-17 2012-03-08 Formverfahren nach der technik der verlorenen form mit erzeugung von selbstformenden kühlern Active EP2686121B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1152172A FR2972655B1 (fr) 2011-03-17 2011-03-17 Procede d'obtention d'une piece metallique a partir d'un modele perdu
PCT/FR2012/050486 WO2012146845A1 (fr) 2011-03-17 2012-03-08 Moulage en procede modele perdu avec creation de refroidisseurs " auto-formants "

Publications (2)

Publication Number Publication Date
EP2686121A1 true EP2686121A1 (de) 2014-01-22
EP2686121B1 EP2686121B1 (de) 2018-11-14

Family

ID=44168880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12713215.7A Active EP2686121B1 (de) 2011-03-17 2012-03-08 Formverfahren nach der technik der verlorenen form mit erzeugung von selbstformenden kühlern

Country Status (3)

Country Link
EP (1) EP2686121B1 (de)
FR (1) FR2972655B1 (de)
WO (1) WO2012146845A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2989907B1 (fr) * 2012-04-26 2015-07-03 Peugeot Citroen Automobiles Sa Procede d'obtention d'une piece metallique a partir d'un modele perdu
CN104226923A (zh) * 2014-09-22 2014-12-24 青阳县天平机械制造有限公司 一种生产转向桥的铁模覆砂工艺

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2836867A (en) * 1950-12-04 1958-06-03 Morris Bean & Company Process of making mold
US2965514A (en) * 1955-08-09 1960-12-20 Hooker Chemical Corp Process for coating particles with a thermosetting phenolic resin
GB842158A (en) * 1957-05-07 1960-07-20 Misco Prec Casting Company Process of casting titanium and related metal and alloys and apparatus therefor
JPS59166346A (ja) * 1983-03-11 1984-09-19 Toyota Motor Corp 充填鋳造法
JPS59191542A (ja) * 1983-04-15 1984-10-30 Toyota Motor Corp 充填鋳造法
JPS6277148A (ja) * 1985-09-30 1987-04-09 Toyota Motor Corp 急冷凝固フルモ−ルド鋳造法及び装置
FR2685229B1 (fr) * 1991-12-20 1995-05-24 Peugeot Procede de moulage en modele perdu et element refrigerant pour la mise en óoeuvre de ce procede.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012146845A1 *

Also Published As

Publication number Publication date
WO2012146845A1 (fr) 2012-11-01
FR2972655A1 (fr) 2012-09-21
FR2972655B1 (fr) 2015-02-27
EP2686121B1 (de) 2018-11-14

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