FR2615425A1 - Pattern for lost foam moulding process - Google Patents
Pattern for lost foam moulding process Download PDFInfo
- Publication number
- FR2615425A1 FR2615425A1 FR8707133A FR8707133A FR2615425A1 FR 2615425 A1 FR2615425 A1 FR 2615425A1 FR 8707133 A FR8707133 A FR 8707133A FR 8707133 A FR8707133 A FR 8707133A FR 2615425 A1 FR2615425 A1 FR 2615425A1
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- FR
- France
- Prior art keywords
- model
- lost foam
- core
- model according
- pattern
- 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
Links
Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
La présente invention concerne la technique du moulage à partir de modèles en mousse perdue, connue sous le nom de LOST FOAM ou procédé de moulage à mousse perdue. The present invention relates to the molding technique from lost foam models, known as LOST FOAM or lost foam molding process.
Dans cette technique, un modèle en un matériau en mousse, tel que du polystyrène expansé, présentant la forme exacte de la pièce à obtenir, est noyé dans du sable contenu dans un moule ; puis le métal liquide est verse dans le moule et prend la place de la mousse qui se volatilise. In this technique, a model made of a foam material, such as expanded polystyrene, having the exact shape of the part to be obtained, is embedded in sand contained in a mold; then the liquid metal is poured into the mold and takes the place of the foam which volatilizes.
Or on a constaté que si la pièce finie doit comporter des passages étroits, de l'ordre de quelques millimètres, des imperfections peuvent compromettre la bonne réalisation de ces passages. Il en est ainsi, par exemple, pour la fabrication de carters ou blocs-cylindres de moteurs à explosions lorsque l'on veut réaliser, bruts de fonderie, des passages d'eau dans la partie supérieure des cloisons séparant deux cylindres. Des défauts de réalisation de ces passages d'eau sont de nature à empêcher un bon refroidissement de ces parties du moteur. However, it has been found that if the finished part must have narrow passages, of the order of a few millimeters, imperfections can compromise the good performance of these passages. This is the case, for example, for the manufacture of casings or cylinder blocks of explosion engines when it is desired to make, rough foundry, water passages in the upper part of the partitions separating two cylinders. Faults in the construction of these water passages are such as to prevent good cooling of these parts of the engine.
L'invention a pour but de remédier à cet inconvénient. The invention aims to remedy this drawback.
Elle concerne donc un modèle en matériau en mousse, réalisé en plusieurs parties assemblées pour reconstituer la forme de la pièce à obtenir et délimitant des passages de faible largeur. Ce modèle est caractérisé en ce que lesdits passages sont occupés par un noyau en sable immobilisé entre différentes parties du modèle. It therefore relates to a model made of foam material, produced in several parts assembled to reconstitute the shape of the part to be obtained and delimiting passages of small width. This model is characterized in that said passages are occupied by a core of sand immobilized between different parts of the model.
L'invention a également pour objet un procédé de moulage d'une pièce métallique mettant en oeuvre un tel procédé. The invention also relates to a method of molding a metal part using such a method.
Un exemple de réalisation fait l'objet de la rescription qui suit, en référence aux dessins joints dans lesquels - La Fig 1 est une coupe partielle, en élévation, d'un carter ou bloc-cylindres; - La Fig 2 est une coupe partielle selon la ligne 2-2 de la Fig 1; - La Fig 3 est une coupe partielle selon la ligne 3-3 de la Fig I; - La Fig 4 est une coupe partielle, en élévation, d'un modèle pour réalisation du carter-cylindres selon les Figs l à 3; - Les Fig 5 et 6 sont des coupes partielles selon les lignes 5-5 et 6-6 de la Fig 4. An exemplary embodiment is the subject of the following description, with reference to the accompanying drawings in which - FIG. 1 is a partial section, in elevation, of a casing or cylinder block; - Fig 2 is a partial section along line 2-2 of Fig 1; - Fig 3 is a partial section along line 3-3 of Fig I; - Fig 4 is a partial section, in elevation, of a model for producing the cylinder block according to Figs 1 to 3; - Figs 5 and 6 are partial sections along lines 5-5 and 6-6 of Fig 4.
On voit, sur la coupe de la Fig 1, un carter ou bloc-cylindres 1 de moteur à explosions comportant notamment des fûts de cylindres 2, deux fûts adjacents étant reliés par des cloisons 2a. Au voisinage des parties supérieures des cloisons 2a sont ménagés des passages d'eau 3 dont la largeur peut être, par exemple de 2,5 mm. Eventuellement, un pont de métal 4 est disposé au centre de chacun de ces passages d'eau. We see, in the section of Fig 1, a casing or cylinder block 1 of an explosion engine including in particular barrels of cylinders 2, two adjacent barrels being connected by partitions 2a. In the vicinity of the upper parts of the partitions 2a, water passages 3 are provided, the width of which may be, for example, 2.5 mm. Optionally, a metal bridge 4 is placed in the center of each of these water passages.
Pour obtenir ce carter-cylindres par la technique de moulage à mousse perdue avec des passages d'eau bruts de fonderie, on réalise un modèle en plusieurs parties, tel que représenté sur les Fig 4 à 6. To obtain this cylinder block by the lost foam molding technique with raw foundry water passages, a multi-part model is produced, as shown in FIGS. 4 to 6.
Ce modèle comprend, notamment, les parties suivantes - des cylindres 5, 6, 7. This model includes, in particular, the following parts - cylinders 5, 6, 7.
- des flancs 8, 9. - flanks 8, 9.
- une partie supérieure 10 disposée entre les flancs 8, 9 et dans laquelle s'engagent les parties supérieures des cylindres 5, 6;7. an upper part 10 disposed between the sides 8, 9 and in which the upper parts of the cylinders 5, 6 engage; 7.
Un intervalle délimité entre les cylindres 5, 6 ou 6, 7 et la pièce 10, est destiné à former les passages d'eau 3 de la pièce finie. Cet intervalle est occupé par un noyau 12 réalisé en sable et immobilisé entre les cylindres, la pièce 10 et les flancs 8 et 9. Un orifice 13 ménagé dans ce noyau, permet l'obtention du pont 4 au milieu des passages d'eau 3. An interval defined between the cylinders 5, 6 or 6, 7 and the part 10, is intended to form the water passages 3 of the finished part. This interval is occupied by a core 12 made of sand and immobilized between the cylinders, the part 10 and the sides 8 and 9. An orifice 13 formed in this core, makes it possible to obtain the bridge 4 in the middle of the water passages 3 .
Le modèle ainsi réalisé est ensuite utilisé suivant la technique classique du moulage à mousse perdue, le métal liquide prenant la place occupée par la mousse et comblant l'espace vide 13 ménagé au milieu du noyau 12. Ce dernier est éliminé, après coulée, par tout moyen connu, notamment par grenaillage. The model thus produced is then used according to the conventional technique of lost foam molding, the liquid metal taking the place occupied by the foam and filling the empty space 13 formed in the middle of the core 12. The latter is eliminated, after casting, by any known means, in particular by shot peening.
Grâce à l'invention, on obtient des passages d'eau, bruts de fonderie, qui sont nets et précis et parfaitement positionnés par rapport aux fûts des cylindres. Thanks to the invention, we obtain water passages, rough foundry, which are clean and precise and perfectly positioned relative to the barrels of the cylinders.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8707133A FR2615425B1 (en) | 1987-05-21 | 1987-05-21 | MODEL FOR LOSS FOAM MOLDING PROCESS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8707133A FR2615425B1 (en) | 1987-05-21 | 1987-05-21 | MODEL FOR LOSS FOAM MOLDING PROCESS |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2615425A1 true FR2615425A1 (en) | 1988-11-25 |
FR2615425B1 FR2615425B1 (en) | 1990-11-16 |
Family
ID=9351296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8707133A Expired - Lifetime FR2615425B1 (en) | 1987-05-21 | 1987-05-21 | MODEL FOR LOSS FOAM MOLDING PROCESS |
Country Status (1)
Country | Link |
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FR (1) | FR2615425B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6446697B1 (en) | 1993-11-29 | 2002-09-10 | Ford Global Technologies, Inc. | Rapidly making complex castings |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR82833E (en) * | 1962-12-26 | 1964-04-24 | Gruenzweig & Hartmann | Manufacturing process of metal castings |
DE1181373B (en) * | 1962-01-20 | 1964-11-12 | Gruenzweig & Hartmann | Casting method and method for producing cores using gasifiable models |
GB1071668A (en) * | 1963-04-03 | 1967-06-14 | Eduard Baur | Feeder body for providing a feeding space in a casting mould |
US3889737A (en) * | 1974-01-04 | 1975-06-17 | Ford Motor Co | Dry sand core process for use with lost foam molding process |
US4632169A (en) * | 1985-05-01 | 1986-12-30 | Outboard Marine Corporation | Two cycle cylinder block foam pattern |
US4691754A (en) * | 1985-12-31 | 1987-09-08 | Deere & Company | Method for forming castings having inserts |
-
1987
- 1987-05-21 FR FR8707133A patent/FR2615425B1/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1181373B (en) * | 1962-01-20 | 1964-11-12 | Gruenzweig & Hartmann | Casting method and method for producing cores using gasifiable models |
FR82833E (en) * | 1962-12-26 | 1964-04-24 | Gruenzweig & Hartmann | Manufacturing process of metal castings |
GB1071668A (en) * | 1963-04-03 | 1967-06-14 | Eduard Baur | Feeder body for providing a feeding space in a casting mould |
US3889737A (en) * | 1974-01-04 | 1975-06-17 | Ford Motor Co | Dry sand core process for use with lost foam molding process |
US4632169A (en) * | 1985-05-01 | 1986-12-30 | Outboard Marine Corporation | Two cycle cylinder block foam pattern |
US4691754A (en) * | 1985-12-31 | 1987-09-08 | Deere & Company | Method for forming castings having inserts |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6446697B1 (en) | 1993-11-29 | 2002-09-10 | Ford Global Technologies, Inc. | Rapidly making complex castings |
Also Published As
Publication number | Publication date |
---|---|
FR2615425B1 (en) | 1990-11-16 |
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