EP0348248B1 - Form für die Herstellung eines metallischen Gegenstandes, Gebrauch dieser Form und Verfahren zur entsprechenden Formherstellung - Google Patents

Form für die Herstellung eines metallischen Gegenstandes, Gebrauch dieser Form und Verfahren zur entsprechenden Formherstellung Download PDF

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Publication number
EP0348248B1
EP0348248B1 EP19890401144 EP89401144A EP0348248B1 EP 0348248 B1 EP0348248 B1 EP 0348248B1 EP 19890401144 EP19890401144 EP 19890401144 EP 89401144 A EP89401144 A EP 89401144A EP 0348248 B1 EP0348248 B1 EP 0348248B1
Authority
EP
European Patent Office
Prior art keywords
mould
moulding
denseners
moulding box
densener
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
EP19890401144
Other languages
English (en)
French (fr)
Other versions
EP0348248A1 (de
Inventor
Michel Schmitt
Jean-Marie Gillet
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 EP0348248A1 publication Critical patent/EP0348248A1/de
Application granted granted Critical
Publication of EP0348248B1 publication Critical patent/EP0348248B1/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
    • 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 a mold comprising coolers for the manufacture of a metal part having at least one surface area hardened by quenching during the molding according to the preamble of claim 1, a molding method according to the preamble of claim 11 and the use of this mold for the manufacture of camshafts.
  • Parts are known, in particular parts used in the automotive industry, such as camshafts, which have certain zones whose surface hardness is higher than the hardness of the other parts of the part.
  • the sand molding of the part is carried out in an imprint formed inside the sand filling a hollow metal frame which generally consists of several parts. Rapid cooling or quenching of the cast iron is provided in the areas of the cavity corresponding to the periphery of the cams by metal coolers flush with the surface of the cavity.
  • the coolers have a surface intended to come into contact with the liquid iron, the shape of which corresponds to that of at least part of the external surface of the cam.
  • the mold is generally made up of two superimposable half-molds which each have a cavity corresponding to a half-cavity of the part.
  • the coolers are either made up of separate parts or connected together to form clusters of several coolers.
  • each of the coolers corresponds to half of the periphery of a cam and must be placed in a semi-mold produced beforehand.
  • the cluster of coolers is placed on the model plate before the half-mold is produced.
  • the coolers constitute independent elements which it is necessary to place very precisely in the mold before or after filling it with sand and before each casting.
  • the coolers are removed with the sand from which they are collected.
  • the coolers must be sorted since they are not all identical, then prepared for the next molding operation.
  • the object of the invention is therefore to propose a mold for the manufacture of a metal part having at least one surface area hardened by quenching during molding, comprising a hollow metal frame containing molding sand delimiting the imprint of the part and at least one cooler made of a metallic material placed in the molding sand and flush with the surface of the imprint in a part of this imprint corresponding to the hardened area of the part, this mold making it possible to avoid long and costly operations installation and recovery of coolers.
  • the cooler is integral with the chassis.
  • the mold according to the invention consists of a lower half-mold 1 shown in FIG. 1 and an upper half-mold 2 shown in FIG. 2.
  • the lower half-mold 1 comprises a half-frame 3 with a rectangular section and the upper half-mold 2 a half-frame 4, also with a rectangular section, the sections of the half-frames 3 and 4 being perfectly superimposable.
  • the steel half-frames 3 and 4 produced in hollow form, are filled with sand 5 in which two half-cavities 6, 6 ′ have been made for the molding of two camshafts of motor vehicles.
  • a cavity 7 communicating with the cavities 6, 6 'to constitute a metal reserve counterweight intended to compensate for shrinkage during molding as well as a filling cup 8 passing through the half-mold upper 2 over its entire thickness.
  • a runner 9 is provided in the lower half-mold 1 in accordance with the end of the filling cup 8.
  • Metal coolers 10 generally constituted by steel plates are arranged in the lower half-mold 1 and in the upper half-mold 2, in corresponding positions, at the molding zones of the cams of the cavities 6 and 6 ′ of the two camshafts.
  • the coolers 10 comprise cooling surfaces 13 flush with the surface of the cavities 6 and 6 ′ in zones corresponding to the peripheral part of the cams which it is desired to ensure quenching during molding.
  • the coolers 10 according to the invention are fixed to the corresponding half-chassis 3 and 4, of which they remain integral during all the stages of the molding process.
  • Each of the coolers 10 consists of a steel plate having two recesses intended to constitute the cooling surfaces 13 at the periphery of the cam molding zones.
  • the coolers 10 are arranged transversely inside the half-chassis 3 and 4 between the two long sides of these half-chassis.
  • the coolers 10 have a length, in the transverse direction, slightly greater than the internal width of the half-chassis and the corresponding sides of the half-chassis 3 and 4 have assembly grooves 14 (FIG. 4) in which come engage the ends of the coolers 10 during assembly.
  • the sides of the half-frames 3 and 4 are drilled at the bottom of grooves 14 with two holes 15 and 16 and the coolers 10 have, on each of their lateral sides, engaging in the grooves 14, a tapped hole 17 and a smooth hole 18.
  • the assembly and positioning of the cooler are ensured on each of its lateral sides by a screw 20 and a pin 21.
  • the pin 21, engaged in the holes 16 and 18 in concordance, ensures the positioning of the cooler in the groove 14 and the screw 20, engaged in the opening 15 and screwed in the threaded hole 17, ensures the assembly of the cooler 10 on the half chassis.
  • FIG 5 there is shown a cooler 10 'according to an alternative embodiment comprising a recess 13' of reduced amplitude.
  • the recesses 13 'of the corresponding coolers 10' surround only part of the periphery of the cam, which makes it possible to quench and harden only part of the cam .
  • the coolers 10 ′ are fixed to the corresponding half-chassis by means of their lateral sides of reduced height in which are tapped holes 17 ′.
  • the mold frame may for example be made of ordinary steel and the coolers made of alloy steel or any other metallic material.
  • half-molds 1 and 2 formed by the half-chassis and the coolers fixed to these half-chassis.
  • the manufacture of the mold is carried out by placing each of the half-chassis on the corresponding model plate and by filling the half-chassis with molding sand. It is therefore not necessary to carry out, during this operation, the installation and adjustment of the coolers which are integral with the half-chassis.
  • the mold is then assembled by superimposing the two half-molds 1 and 2, then the mold is filled by the cup 8.
  • the castings are then cooled to a temperature of between 700 and 800 ° before demolding is carried out by unhooking the mold.
  • the half-molds 1 and 2 are then ready for a new molding operation.
  • the coolers being integral with the chassis of the half-molds, it is not necessary to carry out, as in the prior art, the recovery of the coolers in the molding sand, the sorting of these coolers and then the placing of these in the mold.
  • chassis-cooler assemblies are cooled after release by an air flow to bring the half-molds to a temperature enabling the mold preparation operations to be carried out.
  • the coolers are then at a temperature of about 200 ° C. Cooling by an air flow at 10 ° C allows the temperature of these chillers to be brought to a temperature which can be between 30 and 50 ° C in a very short time.
  • coolers are detachably linked to the chassis, for example a forecourt, these coolers can be replaced in the event of wear.
  • the cooler and the mold frame can be made of different materials.
  • the invention applies regardless of the number of parts which are cast in a mold and whatever the extent of the surface to be quenched at the periphery of these parts.
  • the invention applies as well in the case of conventional foundry as in the case where the lost model process (PMP) is used.
  • PMP lost model process
  • the invention applies not only to the molding of camshafts but also to the molding of other cast iron parts or even to the molding of metal parts made of materials other than cast iron, which can be hardened by rapid cooling or quenching. certain areas during molding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Claims (13)

1. Eine Form für die Herstellung eines metallischen Gegenstandes, der mindestens einen während des Gußverfahrens durch Glühen gehärteten Oberflächenbereich aufweist, mit einem hohlen Metallkasten (3, 4), der mit Formsand (5) befüllt ist, welcher den Formabdruck (6, 6') des Teils abgrenzt, und mit mindestens einer Kühlvorrichtung (10) aus einem metallischen Werkstoff, die in dem Formsand (5) angeordnet ist und mit der Oberfläche des Formabdruckes (6, 6') an einem Teil (13) dieses Formabdruckes bündig abschließt, die dem gehärteten Bereich des Teils entspricht, dadurch gekennzeichnet, daß die Kühlvorrichtung (10) mit dem Metallkasten (3, 4) fest verbunden ist.
2. Eine Form nach Anspruch 1, die zwei Formhälften (1, 2) aufweist, die jeweils eine Kastenhälfte (3, 4) enthalten, dadurch gekennzeichnet, daß auf jeder der Kastenhälften (3, 4) mindestens eine Kühlvorrichtung (10) angeordnet ist.
3. Eine Form nach Anspruch 2, die Kastenhälften (3, 4) mit rechteckigem Querschnitt aufweist, dadurch gekennzeichnet, daß die Kühlvorrichtungen (10) in Form von Platten gebildet sind, die in Querrichtung in den Kastenhälften (3, 4) zwischen deren großen Seiten angeordnet sind.
4. Eine Form nach einem der Ansprüche 1, 2 und 3 dadurch gekennzeichnet, daß die Kühlvorrichtungen (10) löslich an dem Kasten (3, 4) befestigt sind.
5. Eine Form nach Anspruch 4, dadurch gekennzeichnet, daß die Kühlvorrichtungen (10) durch Schrauben (20) an dem Kasten (3, 4) befestigt sind.
6. Eine Form nach Anspruch 4, dadurch gekennzeichnet, daß die Kühlvorrichtungen (10) mit ihren Enden in Nuten (14) eingreifen, die in den dem Kasten (3, 4) Flächen gegenüberliegenden Flächen eingebracht sind.
7. Eine Form nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Kasten (3, 4) einerseits und die Kühlvorrichtung (10) andererseits aus verschiedenen Werkstoffen hergestellt sind.
8. Eine Form nach Anspruch 7, dadurch gekennzeichnet, daß der Kasten (3, 4) aus gewöhnlichem Stahl und die Kühlvorrichtung (10) aus legiertem Stahl hergestellt ist.
9. Eine Form nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Kühlvorrichtung (10) mindestens eine Aussparung (13) aufweist, die eine Kühlfläche bildet, die dem gehärteten Bereich des Teils entspricht.
10. Eine Form nach Anspruch 9, dadurch gekennzeichnet, daß die Aussparung (13') der Kühlvorrichtung (10') nur einem Abschnitt der Peripherie des Teils in dem gehärteten Bereich entspricht.
11. Gußverfahren für ein metallisches Teil, das mindestens einen durch Glühen gehärteten Oberflächenbereich aufweist, das darin besteht, einen Formabdruck (6, 6') des Teils in Formsand (5) herzustellen, mit dem ein Metallkasten (3, 4) befüllt ist, in dem Kühlvorrichtungen (10) angeordnet sind, und darin, daß das flüssige Metall in den Formabdruck gegossen wird, und darin, daß das Ausformen durch Ausschlagen der Form nach Abkühlung und Verfestigung des flüssigen Metalls erfolgt, dadurch gekennzeichnet, daß nach dem Ausschlagen eine gleichzeitige Abkühlung,des Kastens (3, 4) und der Kühlvorrichtungen (10) durchgeführt wird.
12. Ein Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß die Abkühlung des Kastens (3, 4) und der Kühlvorrichtungen (10) durch zirkulierende Luft bewirkt wird.
13. Gebrauch einer Form nach einem derAnsprüche 1 bis 11 für die Herstellung von Nockenwellen aus Gußstahl für Kraftfahrzeuge, deren Nocken geglüht sind.
EP19890401144 1988-06-24 1989-04-21 Form für die Herstellung eines metallischen Gegenstandes, Gebrauch dieser Form und Verfahren zur entsprechenden Formherstellung Expired - Lifetime EP0348248B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8808541 1988-06-24
FR8808541A FR2633206B1 (fr) 1988-06-24 1988-06-24 Moule pour la fabrication d'une piece metallique, utilisation de ce moule et procede de moulage correspondant

Publications (2)

Publication Number Publication Date
EP0348248A1 EP0348248A1 (de) 1989-12-27
EP0348248B1 true EP0348248B1 (de) 1992-07-01

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Family Applications (1)

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EP19890401144 Expired - Lifetime EP0348248B1 (de) 1988-06-24 1989-04-21 Form für die Herstellung eines metallischen Gegenstandes, Gebrauch dieser Form und Verfahren zur entsprechenden Formherstellung

Country Status (4)

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EP (1) EP0348248B1 (de)
DE (1) DE68901957T2 (de)
ES (1) ES2033535T3 (de)
FR (1) FR2633206B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4431713C2 (de) * 1994-09-06 2001-03-15 Audi Ag Vorrichtung zum Herstellen von Gußstücken

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH577864A5 (de) * 1974-05-29 1976-07-30 Sulzer Ag
DE2646060A1 (de) * 1976-10-13 1978-04-20 Friedhelm Prof Dr Ing Kahn Verfahren und vorrichtungen zur steuerung des waermehaushalts von giessformen
CH650430A5 (de) * 1980-08-29 1985-07-31 Fischer Georg Gmbh Verfahren zum giessen von metallen mittels phenolharzgebundenen sandformen.

Also Published As

Publication number Publication date
DE68901957D1 (de) 1992-08-06
FR2633206A1 (fr) 1989-12-29
EP0348248A1 (de) 1989-12-27
FR2633206B1 (fr) 1990-10-12
ES2033535T3 (es) 1993-03-16
DE68901957T2 (de) 1992-12-10

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