EP0344042A1 - Vorrichtung zum Transport einer metallischen Schmelzzusammensetzung mittels gekühlten Kolbens unter starkem Druck für eine vertikale Druckgiessmaschine - Google Patents

Vorrichtung zum Transport einer metallischen Schmelzzusammensetzung mittels gekühlten Kolbens unter starkem Druck für eine vertikale Druckgiessmaschine Download PDF

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Publication number
EP0344042A1
EP0344042A1 EP89401324A EP89401324A EP0344042A1 EP 0344042 A1 EP0344042 A1 EP 0344042A1 EP 89401324 A EP89401324 A EP 89401324A EP 89401324 A EP89401324 A EP 89401324A EP 0344042 A1 EP0344042 A1 EP 0344042A1
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EP
European Patent Office
Prior art keywords
piston
molten metal
transferring
metal composition
composition onto
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
EP89401324A
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English (en)
French (fr)
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EP0344042B1 (de
Inventor
Jean-Claude Le Moine
Pierre Bres
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.)
BEAUJOLAISE DE FONDERIE - SOBEFO Ste
Societe Nationale des Poudres et Explosifs
Original Assignee
BEAUJOLAISE DE FONDERIE - SOBEFO Ste
Societe Nationale des Poudres et Explosifs
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.)
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Application filed by BEAUJOLAISE DE FONDERIE - SOBEFO Ste, Societe Nationale des Poudres et Explosifs filed Critical BEAUJOLAISE DE FONDERIE - SOBEFO Ste
Publication of EP0344042A1 publication Critical patent/EP0344042A1/de
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Publication of EP0344042B1 publication Critical patent/EP0344042B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2038—Heating, cooling or lubricating the injection unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/203—Injection pistons

Definitions

  • the invention relates to a device for transferring a molten metal composition under high pressure, this system having a piston provided with a cooling system.
  • Known pressure molding apparatuses mostly have a molten metal injection system arranged so as to vertically inject molten metal into molds.
  • modules generally consist of two modules: - an upper module at which the mold and the mold release device can be installed; - a lower module, the main elements of which are the injection cylinder, the injection piston and the supply device.
  • supply device means a device into which the molten composition is introduced.
  • the main difficulty of the high pressure molding method is to prevent the molten metal from cooling too much during its transfer into the mold. Indeed the cooled metal sees its viscosity increase, which seriously harms the maintenance of the pressure during the pressing operation and as a corollary to the quality of the molded parts.
  • the most elaborate are provided with feeding devices aimed at reducing the transfer time by acting on the feeding mode of the molten metallic composition.
  • Patent FR 2 446 145 relates to a machine for casting under vertical pressure in which the fusion takes place directly within the machine by means of an electromagnetic coil.
  • the metal is introduced while it is solid by a mechanical arm.
  • the melting chamber is arranged coaxially under an injection cylinder to reduce the time between the melting of the metal and its injection into the mold.
  • Patent EP 164,301 describes a vertical pressure molding apparatus comprising two modules.
  • the lower module consisting of the piston and the injection cylinder is mounted in rotation on an axis so that the molten composition can be poured directly into the injection cylinder and, by a simple angular movement, brought quickly under the upper module in order to undergo the pressing operation inside the mold.
  • the supply device therefore comprises the injection cylinder itself.
  • the piston pushes the metal back into the mold at high speed so as to guarantee proper filling of the latter.
  • the introduction of molten material into the injection chamber has the effect of causing significant heating, on the one hand of the front wall of the injection piston serving as a base for the injection chamber. injection, on the other hand of the same walls of the chamber.
  • French Patent No. 2,416,754 describes a device for cooling the injection piston using a cooling water circuit inside the piston connected to a water distribution network and coupled to a water flow control.
  • European patent EP 116 906 describes an injection piston provided with a more elaborate internal cooling system consisting of a pipe delimited by the internal walls of the piston and by a mouthpiece provided with a tube for feeding the cooling liquid.
  • the technical problem which the invention proposes to solve is complex.
  • the transfer time of the molten metal must be fast to ensure good filling of the mold and good quality of the molded parts.
  • the metal to be molded must not have too high a temperature in order to avoid the problems of expansion and metallurgy explained above which adversely affect the life of the press and the metallurgical quality of the molded parts.
  • the subject of the present invention is a device for the transfer under pressure of a molten metallic composition provided with a piston with a privileged peripheral cooling zone making it possible to obtain, during the very short time of the transfer of the molten metallic composition, self-construction. a seal while avoiding the problems relating to thermal expansion of the piston and seizing on the walls of the injection chamber.
  • the object of the invention is to produce a tight seal between the piston and the wall of the injection chamber, so as to avoid any flow of molten material while ruling out the possibility of excessive cooling of the front part of the piston, in order to overcome the drawbacks mentioned in the introduction.
  • This molding apparatus can be used for molding materials having a melting point above 400 ° C, i.e. metals and alloys.
  • metals and alloys i.e. metals and alloys.
  • the designation "metallic composition” should be understood as including metals and alloys, in particular composite alloys with a metallic matrix.
  • the working pressures generated by the piston vary from 200 to 800 bars.
  • the device for transferring molten metal composition according to the invention consists of an upper module, produced according to a method known from the prior art and in which the mold can be placed, and of a lower module comprising a device and a piston.
  • the piston has a privileged cooling zone located at the periphery of its front wall, this sliding piston with a predetermined clearance inside the supply device containing the metallic composition to be discharged.
  • the front wall of this piston is provided with a peripheral chamfer forming with the front wall an acute angle less than 45 ° and preferably between 25 ° and 35 ° and delimiting with the wall of the injection chamber a frustoconical cavity .
  • the piston is also provided with an internal cooling circuit comprising a peripheral groove hollowed out in the front wall of the piston, this groove making it possible to transform the peripheral chamfer mentioned above into a privileged cooling zone.
  • the front wall of the piston has a thickness which is at least twice as great in its central part as in its peripheral part.
  • the central part is thus much less cooled than the peripheral part.
  • the front wall of the piston is coated with a heat shield.
  • This shield consists of a layer of a material having, on the one hand a sufficiently low thermal conductivity coefficient, that is to say less than that of the piston head, and on the other hand a hardness greater than that of the piston head.
  • the materials preferably used are carbides and nitrides such as chromium carbide or tungsten carbide, of the type sold by Union Carbide under the brand UCAR.
  • the piston shell is also entirely or partially coated with thermal protection to improve the sliding between the piston and the wall of the chamber and also having an anti-wear role.
  • the cooling zone is in connection with a cooling circuit the flow of which is adjustable: - At first, corresponding to the period preceding the introduction of the molten molding material, the flow rate of the coolant is low so as not to excessively cool the piston, while avoiding the risks of vaporization; - Secondly, during which the molten molding material is introduced, the flow rate is high to ensure good cooling of the privileged peripheral zone of the piston.
  • the device for supplying molten metal can be any system described in the prior art, such as the device described in patent EP 164,301.
  • the molten metal is introduced directly into the injection cylinder.
  • this supply system resides in a bottomless container which can slide horizontally and sealingly on a heating floor from a loading position. to a molding position and vice versa. When the container is in the molding position, it constitutes the upper part of the injection chamber.
  • the pressure molding apparatus described below is made of steel alloyed with 5% chromium, commonly used in the treated state in the production of molds.
  • the press body 9 consists, on the one hand of a frame 1 surmounted by an asbestos seal 34 and equipped with a heating hearth 2 and in which is arranged along a vertical axis an injection cylinder 3 and d on the other hand, a bottomless container 5 which can slide on the floor 2 in a horizontal movement so as to be placed coaxially with the injection cylinder 3.
  • the bottomless container is shown in the molding position, while the loading position is shown in thin phantom.
  • the piston 4 slides vertically in the injection cylinder and is here shown in the low position.
  • the bottomless container 5 delimits a cylindrical space which constitutes the upper part of the injection chamber 6, the part bottom of this chamber being delimited by the injection cylinder 3.
  • the internal diameter of the bottomless container 5 is the same as that of the injection cylinder 3.
  • the walls of the bottomless container 5 are thermally insulated and treated with anti-adhesion.
  • This bottomless container 5 is further provided with an internal preheating system 8.
  • the bottomless container slides by a horizontal movement at variable speed on the heating floor 2 also thermally insulated and treated non-stick.
  • the sole 2 is provided with a heating means 33.
  • the sole 2 is only heated on one part, corresponding approximately to the area in contact with the container when the latter is in the loading position. This position is shown in thin dashed lines.
  • the thermal insulation and the anti-adhesion treatment of the walls of the bottomless container 5 and of the surface of the heating sole 2 are produced by adding a layer of rectified tungsten carbide, followed by smoothing with graphite.
  • the carbides and nitrides preferably used are chromium carbide, tungsten carbide, bromine nitride and tungsten nitride.
  • the tightness of the container 5 without sliding bottom on the heating floor 2 is obtained by metal-metal contact of the isolated areas on the floor 2 and on the walls of the container 5.
  • the injection cylinder 3 has a position coaxial with the container when the latter is in the molding position.
  • the inner surface of this cylinder is also coated with thermal protection and treated with non-sticking in the same way as the heating sole 3 and the bottomless container walls 5.
  • the interior of the press body that is to say the injection chamber 6 delimited on the one hand by the injection cylinder 3 on the other hand by the internal walls of the container 5 is therefore entirely graphite.
  • the chamber graphitation operation is regularly carried out using a graphite fill.
  • the sole surface is also permanently graphitized using a graphite tank.
  • the injection piston 4 according to the invention consists of a rod 10, a body 11 and a head 12.
  • the piston rod 10 comprises at its end a body 13 provided with a shoulder 14.
  • the body 11 is screwed into the body 13 of the piston until a stop position defined by shoulder 14.
  • the seal between the body of the piston 11 and the body of the rod 13 is produced by means of an O-ring 15.
  • the piston head has on the external face of its front wall 16 a peripheral chamfer 17 forming an acute angle of 25 ° with the normal to this face.
  • the front wall 16 is hollowed out on its internal face with a peripheral groove 19.
  • the chamfer 17 and the groove 19 define a preferred peripheral cooling zone 18.
  • the rod 10 of the piston has a coaxial channel 20 in which is disposed a central tube 21 of annular section allowing the supply of coolant.
  • the diameter of the tube 21 is sufficiently smaller than the diameter of the coaxial channel of the piston so as to provide an annular slot 28 between the internal wall of the piston rod and the external wall of the tube 21.
  • This tube 21 is provided at its end with a lateral opening 22 of diameter equal to the diameter of the internal section of the tube 21.
  • An extension 23 is supported on the internal central part of the head of the piston 12 and has, on the one hand an opening 24 of the same diameter as the opening 22 and on the other hand a spiral rib 25 of trapezoidal section so as to that the openings 22 and 24 are facing each other. All of the internal parts of the piston are held in place by means of the body of the rod 13 which is screwed into the body of the piston 11.
  • This chamber is extended by another annular chamber 27 defined by the peripheral groove 19 formed in the internal wall of the piston head and is also in communication with the annular slot 28 defined by the walls of the rod 10 of the piston and by the tube 21.
  • the chamfer 17 and the plate 29 constitute the front wall 16 of the head 12 of the piston.
  • the plate 29 is coated with a heat shield 32 over its entire surface.
  • the chamfer 17 has recessed surfaces 30 covered with a thermal protection of the same kind as the coating of the plate and ensure continuity with the coating of the ferrule.
  • the number of spans that the chamfer 17 has is four but this number can vary from four to eight.
  • the head 12 of the piston constructed according to a preferred variant of the invention comprises a ferrule 31 which is provided with a partial thermal protection arranged in wide pitch spirals and having partial continuity with the thermal coating 32 of the stage.
  • a composition to be molded is, for example, on standby in a so-called holding oven which makes it possible to keep it at a given temperature, generally comprised around 650 ° C.
  • the bottomless container 5 is placed in the loading position (in thin lines in FIG. 1).
  • An automatic ladle allows the container to be fed into the waiting position by a predetermined volume of the molten composition.
  • the ladle allows the volume of metal to be deposited in the container, possibly through a gaseous protection to prevent the formation of oxides.
  • the filled container 5 is animated by a horizontal sliding movement at variable speed on the heating floor 2.
  • the molten composition is thus translated above the injection cylinder 3 in which the piston 4 is arranged in the low position.
  • the low position of the piston is such that the plate 29 thereof is in the same plane as the upper surface of the sole 2.
  • the front wall 16 of the piston 4, that is to say the plate 29 and the chamfer 17 thus form the base of the injection chamber 6.
  • the coolant supply system After switching on the coolant supply system, it is brought under pressure by the tube 21. It then invades the annular chamber 27 thanks to the connection formed by the openings 22 and 24.
  • the small thickness of the wall of the piston head at the chamfer 17 makes it possible to create a privileged cooling zone 18 on the periphery of the piston head.
  • the coolant then circulates in the helical chamber 26 and then in the slot annular 28 which communicates with a pump not shown.
  • the seal in the form of a frustoconical ring thus produced seals and resists pressure and therefore makes it possible to maintain this pressure during solidification. Any undesirable flow is thus avoided at the level of the clearance between the piston and the supply system containing the metal to be discharged, and any risk of seizure between the piston and the bottomless container is thus eliminated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP19890401324 1988-05-26 1989-05-12 Vorrichtung zum Transport einer metallischen Schmelzzusammensetzung mittels gekühlten Kolbens unter starkem Druck für eine vertikale Druckgiessmaschine Expired - Lifetime EP0344042B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8807020 1988-05-26
FR8807020A FR2631862B1 (fr) 1988-05-26 1988-05-26 Dispositif de transfert a piston refroidi, d'une composition metallique en fusion sur une presse verticale de moulage a forte pression

Publications (2)

Publication Number Publication Date
EP0344042A1 true EP0344042A1 (de) 1989-11-29
EP0344042B1 EP0344042B1 (de) 1992-02-26

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EP19890401324 Expired - Lifetime EP0344042B1 (de) 1988-05-26 1989-05-12 Vorrichtung zum Transport einer metallischen Schmelzzusammensetzung mittels gekühlten Kolbens unter starkem Druck für eine vertikale Druckgiessmaschine

Country Status (3)

Country Link
EP (1) EP0344042B1 (de)
DE (1) DE68900858D1 (de)
FR (1) FR2631862B1 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5758711A (en) * 1995-05-26 1998-06-02 Water Gremlin Company Molding apparatus for minimizing shrinkage and voids
FR2949694A1 (fr) * 2009-09-10 2011-03-11 Peugeot Citroen Automobiles Sa Piston d'injection pour le moulage sous pression et procede de moulage
US8202328B2 (en) 2004-01-02 2012-06-19 Water Gremlin Company Battery part
US8497036B2 (en) 2009-04-30 2013-07-30 Water Gremlin Company Battery parts having retaining and sealing features and associated methods of manufacture and use
US8701743B2 (en) 2004-01-02 2014-04-22 Water Gremlin Company Battery parts and associated systems and methods
US9034508B2 (en) 2002-03-29 2015-05-19 Water Gremlin Company Multiple casting apparatus and method
US9748551B2 (en) 2011-06-29 2017-08-29 Water Gremlin Company Battery parts having retaining and sealing features and associated methods of manufacture and use
US9954214B2 (en) 2013-03-15 2018-04-24 Water Gremlin Company Systems and methods for manufacturing battery parts
US9962761B2 (en) 2013-11-25 2018-05-08 Pratt & Whitney Services Pte Ltd. Replaceable piston ring for die casting machine plunger
US11038156B2 (en) 2018-12-07 2021-06-15 Water Gremlin Company Battery parts having solventless acid barriers and associated systems and methods

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2416754A1 (fr) * 1978-02-08 1979-09-07 Weingarten Ag Maschf Dispositif de refroidissement pour le piston d'injection d'une machine a couler sous pression
DE3013226A1 (de) * 1980-04-03 1981-10-15 Nippon Light Metal Co. Ltd., Tokyo Verfahren und vorrichtung fuer die kuehlung der spitze eines pressstempels in einer spritzgussmaschine
DE3323328C1 (de) * 1983-06-29 1984-05-03 Mahle Gmbh, 7000 Stuttgart Einteiliger flüssigkeitsgekühlter Gießkolben
EP0116906A1 (de) * 1983-02-18 1984-08-29 Friedrich Glas Giesskolben für Druckgiessmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2416754A1 (fr) * 1978-02-08 1979-09-07 Weingarten Ag Maschf Dispositif de refroidissement pour le piston d'injection d'une machine a couler sous pression
DE3013226A1 (de) * 1980-04-03 1981-10-15 Nippon Light Metal Co. Ltd., Tokyo Verfahren und vorrichtung fuer die kuehlung der spitze eines pressstempels in einer spritzgussmaschine
EP0116906A1 (de) * 1983-02-18 1984-08-29 Friedrich Glas Giesskolben für Druckgiessmaschinen
DE3323328C1 (de) * 1983-06-29 1984-05-03 Mahle Gmbh, 7000 Stuttgart Einteiliger flüssigkeitsgekühlter Gießkolben

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5758711A (en) * 1995-05-26 1998-06-02 Water Gremlin Company Molding apparatus for minimizing shrinkage and voids
US9034508B2 (en) 2002-03-29 2015-05-19 Water Gremlin Company Multiple casting apparatus and method
US10283754B2 (en) 2004-01-02 2019-05-07 Water Gremlin Company Battery parts and associated systems and methods
US8202328B2 (en) 2004-01-02 2012-06-19 Water Gremlin Company Battery part
US9190654B2 (en) 2004-01-02 2015-11-17 Water Gremlin Company Battery parts and associated systems and methods
US8701743B2 (en) 2004-01-02 2014-04-22 Water Gremlin Company Battery parts and associated systems and methods
US9917293B2 (en) 2009-04-30 2018-03-13 Water Gremlin Company Battery parts having retaining and sealing features and associated methods of manufacture and use
US8802282B2 (en) 2009-04-30 2014-08-12 Water Gremlin Company Battery parts having retaining and sealing features and associated methods of manufacture and use
US8497036B2 (en) 2009-04-30 2013-07-30 Water Gremlin Company Battery parts having retaining and sealing features and associated methods of manufacture and use
US11942664B2 (en) 2009-04-30 2024-03-26 Water Gremlin Company Battery parts having retaining and sealing features and associated methods of manufacture and use
US10910625B2 (en) 2009-04-30 2021-02-02 Water Gremlin Company Battery parts having retaining and sealing features and associated methods of manufacture and use
US9935306B2 (en) 2009-04-30 2018-04-03 Water Gremlin Company Battery parts having retaining and sealing features and associated methods of manufacture and use
FR2949694A1 (fr) * 2009-09-10 2011-03-11 Peugeot Citroen Automobiles Sa Piston d'injection pour le moulage sous pression et procede de moulage
WO2011030025A1 (fr) * 2009-09-10 2011-03-17 Peugeot Citroën Automobiles SA Piston d'injection pour le moulage sous pression et procede de moulage
US10181595B2 (en) 2011-06-29 2019-01-15 Water Gremlin Company Battery parts having retaining and sealing features and associated methods of manufacture and use
US9748551B2 (en) 2011-06-29 2017-08-29 Water Gremlin Company Battery parts having retaining and sealing features and associated methods of manufacture and use
US10217987B2 (en) 2013-03-15 2019-02-26 Water Gremlin Company Systems and methods for manufacturing battery parts
US9954214B2 (en) 2013-03-15 2018-04-24 Water Gremlin Company Systems and methods for manufacturing battery parts
US9962761B2 (en) 2013-11-25 2018-05-08 Pratt & Whitney Services Pte Ltd. Replaceable piston ring for die casting machine plunger
US11038156B2 (en) 2018-12-07 2021-06-15 Water Gremlin Company Battery parts having solventless acid barriers and associated systems and methods
US11283141B2 (en) 2018-12-07 2022-03-22 Water Gremlin Company Battery parts having solventless acid barriers and associated systems and methods
US11804640B2 (en) 2018-12-07 2023-10-31 Water Gremlin Company Battery parts having solventless acid barriers and associated systems and methods

Also Published As

Publication number Publication date
DE68900858D1 (de) 1992-04-02
FR2631862A1 (fr) 1989-12-01
FR2631862B1 (fr) 1990-08-10
EP0344042B1 (de) 1992-02-26

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