EP0307287B1 - Form und Verfahren zur Herstellung eines Giessereimodells - Google Patents

Form und Verfahren zur Herstellung eines Giessereimodells Download PDF

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Publication number
EP0307287B1
EP0307287B1 EP88402208A EP88402208A EP0307287B1 EP 0307287 B1 EP0307287 B1 EP 0307287B1 EP 88402208 A EP88402208 A EP 88402208A EP 88402208 A EP88402208 A EP 88402208A EP 0307287 B1 EP0307287 B1 EP 0307287B1
Authority
EP
European Patent Office
Prior art keywords
moulding
mould
segment
pattern
cylinders
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
EP88402208A
Other languages
English (en)
French (fr)
Other versions
EP0307287A1 (de
Inventor
Denis Jouguelet
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen 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 Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0307287A1 publication Critical patent/EP0307287A1/de
Application granted granted Critical
Publication of EP0307287B1 publication Critical patent/EP0307287B1/de
Anticipated expiration legal-status Critical
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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

Definitions

  • the subject of the present invention is a mold for molding a foundry model of an engine cylinder block comprising several cylinders aligned with parallel axes, several bearings for mounting a crankshaft whose axis is perpendicular to the axis of the cylinders, cavities formed around the cylinders and recesses between the bearings and the cylinders.
  • the invention more particularly aims to allow the production of an expanded polystyrene model, used in the molding technique from lost foam medels, known as LOST FOAM or lost foam molding process.
  • the lost models of internal combustion engine cylinder blocks are currently obtained by assembling and gluing different parts of models produced separately as described and shown in document US-A-4632169.
  • the assembly of the various elements has the drawback of causing leaks and cracks, especially in the engine water chamber.
  • This technique also requires precision assembly of the different parts of the model, which can cause numerous faults in the connection area of the different parts.
  • the object of the invention is to propose a mold making it possible to produce a model of cylinder block in a single piece, in particular made of expanded polystyrene.
  • the invention provides a mold of the type comprising three sections of molds superimposed in the direction of the axis of the cylinders, characterized in that it comprises an upper section making it possible to carry out the prior molding of the upper part of the model comprising the cylinders and at least a portion of the cavities, a lower section allowing the prior molding of the lower part of the model comprising the bearings and at least a portion of the recesses, and a central section allowing the molding of the central part of the model comprising the complementary portions of said portions of the cavities and recesses, between said upper and lower parts.
  • the mold comprises an upper removable mold element which cooperates with the upper section, during the prior molding operation of the upper part of the model, to delimit the portions of the cavities and close the opening. of the molding imprint of the upper section which opens to the underside of the latter.
  • the lower and upper faces can be produced in the form of flat faces, perpendicular to the axis of the cylinders, with which cooperate two parallel and opposite plane faces of the central section of the mold.
  • the two preliminary molding steps can be carried out simultaneously.
  • the foundry model 10 made of expanded polystyrene and shown in FIG. 1 has the exact shape of an internal combustion engine cylinder block comprising several aligned cylinders 12, with parallel axes XX, and several bearings 14 for mounting a crankshaft, not shown, the axis YY of which is perpendicular to the axis XX of the cylinders 12.
  • the cylinder block also comprises cavities 16 formed around the cylinders 12 and recesses 18 between the bearings 14 and the cylinders 12.
  • the mold according to the invention comprises three sections of mold 20, 22 and 24 superimposed along the direction of the axis X-X of the cylinders.
  • the upper section 20 makes it possible to pre-mold the upper part 20 ′ of the model in which the cylinders 12 are formed and at least a portion of the cavities 16.
  • the upper section 20 comprises lateral mold elements 26 and 28 as well as a fixed upper element 30 which delimits an imprint 32 in which the prior molding operation of the upper part 20 ′ of the model is carried out.
  • the cavity 32 opens at the lower face 34 of the upper section 20 through an opening 36.
  • the cavity 32 and the corresponding portions of the cavities 16 are also delimited, during the operation of prior molding of the upper part 20 ′ of the model, by an upper removable mold element 38 which cooperates with the mold elements 26, 28 and 30 and which closes the opening 36.
  • the upper section 20, provided with the upper removable mold element 38 constitutes a self-contained mold allowing the upper part 20 'of the foundry model to be produced.
  • the lower mold section 24 is constituted by lateral mold elements 40 and 42 which cooperate with a fixed lower mold element 44 to allow the prior molding of the lower part 24 'of the model comprising the bearings. 14 and at least a portion of the recesses 18 inside a molding cavity 46 which opens at the upper face 48 of the lower section 24.
  • the lower section 24 is provided with a lower removable mold element 50 which cooperates, during the preliminary molding operation of the lower part 24 ′ of the model, with the mold elements 40, 42 and 44 to delimit the molding impression 46 and the portions of the recesses 18 and close the opening 52 of the impression 46.
  • the lower section 24 When equipped with the lower removable mold element 50, the lower section 24 constitutes an autonomous mold, shown in FIG. 5, in which the operation of pre-molding the lower part 24 ′ of the model can be carried out. foundry.
  • the central section 22 of the mold according to the invention also consists of lateral mold elements 54 and 56 which cooperate with removable mold elements 58 to delimit the molding imprint of the central part 22 'of the foundry model.
  • the central section 22 is bounded upwards and downwards by two parallel flat faces 60 and 62 respectively. These opposite flat faces 60 and 62 cooperate respectively with the lower face 34 of the upper section 20 and the upper face 48 of the lower section 24, the latter being planar faces perpendicular to the axis X-X of the cylinders.
  • the mold in three sections according to the invention makes it possible to carry out the molding of a foundry model in one piece according to a process which will now be described.
  • the two preliminary molding operations of the upper 20 ′ and lower 24 ′ parts of the foundry model can be carried out simultaneously.
  • the upper 38 and lower 50 removable mold elements are dismantled.
  • the upper 20 and lower 24 mold sections then appear as shown in FIGS. 6 and 7.
  • the complete mold according to the invention is then produced by interposing the central section 22 between the lower face 34 of the upper section 20 and the upper face 48 of the lower section 24.
  • the three mold sections 20, 22 and 24 having been thus previously positioned and assembled, it only remains to carry out the molding operation of the central part 22 ′ of the model so as to obtain a one-piece foundry model as shown in FIG. 8 which does not require any operation of complementary assembly.
  • Each of the sections 20, 22 and 24 of the mold is conventionally made up of several parts which can, for example, slide and fit together so that they can be dismantled after the final molding operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Claims (7)

1. Form zur Herstellung eines insbesondere aus expandiertem Polystyrol bestehenden Gießereimodells, eines Motorzylinderblocks (50) mit mehreren in einer Linie liegenden Zylindern (12) mit zueinander parallelen Achsen (X-X), mehreren Lagern (14) zur Montage einer Kurbelwelle, deren Achse (Y-Y) zur Achse der Zylinder senkrecht ist, um die Zylinder herum geformten Hohlräumen (16) und Ausnehmungen (18) zwischen den Lagern und den Zylindern, wobei die Form (3) in Richtung der Achse der Zylinder übereinander angeordnete Formabschnitte (20, 22, 24) besitzt, gekennzeichnet durch einen oberen Abschnitt (20), der die Verformung des oberen Teils (20') des Modells mit den Zylindern und mindestens einem Teil der Hohlräume gestattet, einen unteren Abschnitt (24), der die Vorformung des unteren Teils (24') des Modells mit den Lagern und mindestens einem Teil der Ausnehmungen gestattet, und einen mittleren Abschnitt (22), der die Formung des mittleren Teils (22') des Modells mit den die Teile der Hohlräume und Ausnehmungen ergänzenden Teilen zwischen dem oberen Teil (20') und dem unteren Teil (24') gestattet.
2. Form nach Anspruch 1, gekennzeichnet durch ein abnehmbares oberes Formelement (38), das mit dem oberen Abschnitt (20) bei der Vorformung des oberen Teils (20') des Modells zur Abgrenzung der Teile der Hohlräume und zur Verschließung der Öffnung (36) des Formenhohlraums (32) des oberen Abschnitts (20), der an dessen Unterseite (34) ausmündet, zusammenwirkt.
3. Form nach Anspruch 1, gekennzeichnet durch ein abnehmbares unteres Formelement (50), das mit dem unteren Abschnitt (24) bei der Vorformung des unteren Teils (24') des Modells zurAbgrenzung der Teile der Ausnehmungen und zum Verschließen der Öffnung (52) des Formenhohlraums (46) des unteren Abschnitts (24), der an dessen Oberseite (48) ausmündet, zusammenwirkt.
4. Form nach den Ansprüchen 2 und 3, dadurch gekennzeichnet, daß die untere Seite (34) und die obere Seite (48) ebene, zur Achse der Zylinder senkrechte Flächen sind, mit denen zwei einander entgegengesetzte, parallele und ebene Flächen (60, 62) des mittleren Abschnitts (22) zusammenwirken.
5. Verfahren zur Herstellung eines Gießereimodells unter Verwendung einer Form nach den Ansprüchen 1 bis 3, gekennzeichnet durch die folgenden Schritte:
a1) Vorformung des oberen Teils (20') des Modells mit Hilfe des mit dem abnehmbaren oberen Formelement (38) versehenen oberen Abschnitts (20) der Form,
a2) Vorformung des unteren Teils (24') des Modells mit Hilfe des mit dem abnehmbaren unteren Formelement (50) versehenen unteren Abschnitts (24) der Form,
b) Abnahme des oberen und des unteren abnehmbaren Formelements (38) und (50),
c) Herstellung der Form durch Einfügung des mittleren Abschnitts (22) zwischen die untere Fläche (34) des oberen Abschnitts (20) und die obere Fläche (48) des unteren Abschnitts (24) und Zusammenbau der drei Abschnitte, und
d) Formung des mittleren Teils (22') des Modells.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die beiden Vorformungsschritte (a1) und (a2) gleichzeitig ausgeführt werden.
EP88402208A 1987-09-11 1988-09-01 Form und Verfahren zur Herstellung eines Giessereimodells Expired - Lifetime EP0307287B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8712642 1987-09-11
FR8712642A FR2620357B1 (fr) 1987-09-11 1987-09-11 Moule pour le moulage d'un modele de fonderie et son procede de mise en oeuvre

Publications (2)

Publication Number Publication Date
EP0307287A1 EP0307287A1 (de) 1989-03-15
EP0307287B1 true EP0307287B1 (de) 1991-02-06

Family

ID=9354829

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88402208A Expired - Lifetime EP0307287B1 (de) 1987-09-11 1988-09-01 Form und Verfahren zur Herstellung eines Giessereimodells

Country Status (5)

Country Link
US (1) US4884622A (de)
EP (1) EP0307287B1 (de)
JP (1) JPH01157741A (de)
DE (1) DE3861756D1 (de)
FR (1) FR2620357B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2087763C (en) * 1992-02-11 2002-07-02 Jimmy Cochimin Stator frame for dynamoelectric machine and method for making same
US5681518A (en) * 1995-03-15 1997-10-28 Handy & Harman Automotive Group Process for molding a fuel rail assembly

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2824347A (en) * 1952-11-21 1958-02-25 Bohn Aluminium & Brass Corp Molding machine
US2965938A (en) * 1956-06-21 1960-12-27 Permanent Mold & Die Co Inc Apparatus for casting pistons and the like
DE1113726B (de) * 1958-03-26 1961-09-14 Siemens Ag Verfahren zum Herstellen von Hochspannungsisolatoren aus Giessharz
US3897816A (en) * 1970-09-07 1975-08-05 Toyoda Automatic Loom Works Foundry pattern assembly
JPS6036930B2 (ja) * 1978-04-10 1985-08-23 住友重機械工業株式会社 成形金型装置
FR2479044B1 (fr) * 1980-03-26 1985-08-23 Rozier Guy Fusibles pour pieces de fonderie de tres haute precision, procede de fabrication et applications metallurgiques
SU935209A1 (ru) * 1980-12-01 1982-06-15 Научно-Исследовательский Институт Специальных Способов Литья Кокиль
FR2509661A1 (fr) * 1981-07-17 1983-01-21 Ouest Cie Procede et dispositif de moulage de pieces composites en matiere plastique
US4533312A (en) * 1982-12-27 1985-08-06 Holdt J W Von Simplified collapsible mold core
US4576568A (en) * 1985-02-25 1986-03-18 E-W Mold & Tool Company, Inc. Injection mold with thin wall hole forming means
US4632169A (en) * 1985-05-01 1986-12-30 Outboard Marine Corporation Two cycle cylinder block foam pattern

Also Published As

Publication number Publication date
US4884622A (en) 1989-12-05
JPH01157741A (ja) 1989-06-21
FR2620357A1 (fr) 1989-03-17
FR2620357B1 (fr) 1990-01-26
EP0307287A1 (de) 1989-03-15
DE3861756D1 (de) 1991-03-14

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