EP0983812A1 - Verfahren zur Applikation eines Trenn- oder Schmierstoffs - Google Patents

Verfahren zur Applikation eines Trenn- oder Schmierstoffs Download PDF

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Publication number
EP0983812A1
EP0983812A1 EP99109269A EP99109269A EP0983812A1 EP 0983812 A1 EP0983812 A1 EP 0983812A1 EP 99109269 A EP99109269 A EP 99109269A EP 99109269 A EP99109269 A EP 99109269A EP 0983812 A1 EP0983812 A1 EP 0983812A1
Authority
EP
European Patent Office
Prior art keywords
release agent
casting
lubricant
die casting
mold cavity
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
EP99109269A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0983812B1 (de
Inventor
Eckhard Mekus
Helmut Bednareck
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.)
Huettenes Albertus Chemische Werke GmbH
Original Assignee
Huettenes Albertus Chemische Werke GmbH
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 Huettenes Albertus Chemische Werke GmbH filed Critical Huettenes Albertus Chemische Werke GmbH
Publication of EP0983812A1 publication Critical patent/EP0983812A1/de
Application granted granted Critical
Publication of EP0983812B1 publication Critical patent/EP0983812B1/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
    • 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
    • B22D17/2007—Methods or apparatus for cleaning or lubricating moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C23/00—Tools; Devices not mentioned before for moulding
    • B22C23/02—Devices for coating moulds or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening

Definitions

  • the invention relates to a method for applying a separation or Lubricant on the surface of a casting piston and / or the inner wall a casting chamber, a pouring channel and / or a mold cavity Die casting machine.
  • the press system of a casting machine regularly includes a die casting unit with a casting mold, a casting piston and a casting chamber.
  • the casting plunger and casting chamber system elements are usually combined with one Lubricant or release agent treated by a release film around the casting piston forms, reduces the friction between the piston and chamber and thus their Extended lifespan.
  • the mold cavity of a die casting unit is regularly covered with a mold release agent (Die casting release agent) treated, the one in the first place Welding or sticking the liquid cast metal to the mold wall prevent, but also to improve the metal flow as well as for the lubrication of the ejector pins and the movable molded parts should serve.
  • a mold release agent Die casting release agent
  • a release agent or lubricant is used (hereinafter also briefly Called “release agent”), which in gaseous form when entering the die casting unit Condition is present and then within the die casting unit on the surfaces to be treated, the temperature of which is lower than the evaporation temperature of the release agent or lubricant.
  • release agent or lubricant
  • the selection of the Release agent or lubricant (or its components) depends on the previously known temperatures of the surfaces to be treated within the Casting unit off before filling the mold with casting metal. These temperatures again vary depending on the casting weight / shot weight from which Wall thickness of the castings, the composition of the cast alloy, the Melting temperature of the casting metal, the casting temperature etc.
  • the invention also relates to a die casting system for Implementation of the die casting method according to the invention, comprising a Casting chamber, a mold and a device for introducing a vaporized Release agent in the die casting system (and preferably in the Gleßhunt).
  • release pellets which consist of a composition of Wax exist, melt after pouring into the casting chamber and partially evaporate.
  • the "release agent pellets” are thixotropic and - despite their application in the solid state - only lubricated or in the liquid state separable.
  • the vapors include volatile components of the separation or Lubricant material and are useful in so far as they may be can connect with separately applied mold release material.
  • the method according to the invention advantageously takes advantage of the fact that the casting piston and the various walls of the casting chamber, the Pouring channel and the mold cavity of a die casting machine before filling liquid metal regularly for technical reasons on different Temperatures are set.
  • the evaporated release agent or lubricant into the by means of a pressure pulse Die casting machine initiated.
  • the release gas can be mixed with a carrier gas are introduced; however, this is not necessary if the release gas is itself under a sufficiently high pressure and therefore has a correspondingly great desire to expand.
  • the separating or lubricant in the area of the casting chamber initiate. From there, the release gas can flow into the Mold cavity of a casting machine penetrate and - if the wall temperatures allow this - condense there by condensation. In some cases, the gaseous release agent is advantageously in the Area of the mold cavity introduced; from there it penetrates into the Caster before.
  • a pressure is set that is less than atmospheric pressure.
  • the one set in the mold cavity Partial vacuum supports the spreading of the release gas within the Die casting unit and thus promotes even separation on the treating walls and surfaces.
  • the casting piston and the respective Walls of the casting chamber, the pouring channel and the mold cavity in front of the Filling liquid metal as mentioned regularly different Temperatures can be based on this fact adapt flexibly, especially by using the release agent or lubricant is designed so that it comprises a mixture of substances, which at least two substances with different evaporation temperatures contains. These at least two substances will then differ in places Separate temperature. For example, the temperature is present a given (first) location within the die casting unit between the Evaporation temperatures of two substances in a release substance mixture, in this (first) place, the (first) Separate the substance whose evaporation temperature is above the local temperature lies.
  • the (second) substance whose vaporization temperature is below the Local temperature is not preferred at this (first) location precipitate, but essentially as long as in the gaseous state remain until it condenses in another (second) place, the one Has temperature that is lower than the evaporation temperature of the (second) release substance.
  • vaporizable can be used as the release agent or release agent component
  • Substances are used whose evaporation temperature with practicable Evaporation plants can be reached.
  • the evaporation temperature is advantageous a release agent (a release agent component) for Use in a method according to the invention, however, not more than 1000 ° C. It is typically between 100 and 1000 ° C.
  • a release agent evaporated according to the invention can be used before or during the Introduction into the die casting unit solid substances such as boron nitride, cerium fluoride, Graphite, molybdenum disulfide and / or soaps can be added, which the Can affect piston lubrication positively. Such an addition is also still possible after condensation.
  • liquid e.g. a liquid release agent
  • aerosols or mists with the release agent are introduced into the pressure molding machine becomes.
  • Fig. 1 is a schematic representation of a die casting system according to the invention in the operating state.
  • the die casting system shown first comprises a casting chamber 1 and one two-part mold 2, which is closed in the state shown.
  • the casting chamber 1 is in the usual way via a pouring channel 4 with a Mold cavity 3 within the closed mold 2 In connection.
  • the Mold cavity 3 is at its end remote from the casting chamber with a system 5 for Generating a vacuum connected within the mold cavity as they do is known from vacuum die casting machines.
  • the casting chamber 1 has a metal filling opening 6 through which liquid Metal can be poured into the casting chamber.
  • a casting piston 7 which is movable in the longitudinal direction of the casting chamber is arranged, the rest position in the schematic representation of FIG. 1 at the end of the casting chamber 1 remote from the casting channel.
  • a metal filling device 13 which is based on conventional Way above the metal filling opening 6 is arranged.
  • the system shown in Fig. 1 includes in addition to those previously mentioned usual components of a (vacuum) die casting machine a device 8 for vaporizing a release agent with a feed 9 for solid or liquid release agent and a release agent line 10 attached below for Introducing evaporated release agent into the casting chamber 1.
  • the release agent evaporator 8 also has a carrier gas supply 11, which does not have a shown carrier gas source is connected; see. Fig. 5.
  • the release agent line 10, in the gaseous release agent to the casting chamber 1 is the metal filling opening 6 of the casting chamber 1 assigned, cf. also Fig. 3.
  • the feed 9 for solid release agent is available with a release agent metering device 12 in connection, in which sufficient amounts of release agent are stored become.
  • the Release agent metering device 12 for example, solid release agent pellets can be found as in their own publication in the magazine Giesserei 84 (1997), No. 17, pages 43-46; the Release agent metering device 12 is then preferably a pneumatic metering device, that in connection with the feeder 9 via a plastic hose 14 stands, and the feed 9 then preferably comprises a cyclone.
  • pellets are preferably made with a short Blast of compressed air out of the separator metering device 12 and through the transport hose transported into the cyclone (feeder), in which the air escapes and the pellets fall down by gravity.
  • the still solid release material pellets arrive from the feed 9 in the separator evaporator 8 (see FIG. 5), where it evaporates become.
  • the carrier gas supply 11 becomes carrier gas introduced into the evaporator the release agent through line 10, which is typically a Copper pipe, and through the metal filler opening into the Casting chamber 1 initiated.
  • the release agent reaches the mold cavity 3, and it can be found in the die casting machine takes the condensation processes according to the invention, which are based on the fact that the separating agent consists of one substance (or several Substances), their (respective) evaporation temperature at atmospheric pressure is higher than the temperature of the surface of the plunger 7 and / or at least one inner wall of the casting chamber 1, the pouring channel 4 or the mold cavity 3 at the time of introducing the release agent the evaporator 8 into the die casting unit.
  • the release agent is on the applied areas applied.
  • FIG. 2 shows a system according to the invention in a highly schematic manner, to take place when a method according to the invention is carried out To illustrate processes.
  • the evaporation temperature T 0 of the release agent is, for example, greater than T 4 (temperature of the casting piston surface before the mold is filled), condensation is possible at this location.
  • the foundry specialist is able to determine or estimate the local temperatures before filling the mold. It gets these local temperatures with the evaporation temperatures compare possible release agents and then decide in individual cases, which release agent and, if applicable, which release agent / substance mixture he is using becomes.
  • FIG. 3 the die casting system according to the invention according to FIG. 1 is a detail and shown in six different operating states, which are labeled with letters a to f.
  • the system elements shown are identified by the reference symbols already used in FIG. 1, insofar as a label is required for understanding.
  • Fig. 3a shows the die casting system according to the invention at the time of Introduction of a vaporized (gaseous) release agent according to the invention.
  • the vacuum system 5 is turned on, which contributes to the fact that the gaseous Release agent quickly penetrates into the mold cavity 3 and fills it.
  • the flow course of the supplied gaseous release agent is in Fig. 3a indicated by arrows.
  • the condensation of the release agent in the die casting unit happens in the manner already described depending on the release agent evaporation temperature and the local wall temperatures inside the die casting unit.
  • the casting piston 7 is at the introduction of the release agent in its resting position.
  • the die casting system according to the invention is again at the time the introduction of a vaporized (gaseous) release agent according to the invention shown; however, the vacuum system 5 is switched off this time, and the Mold cavity 3 is only over the pouring channel 4 and the casting chamber 1 with the Environment in open communication.
  • Fig. 3c is the operating state of the die casting system after the completion of Release agent discharge shown as it is when the vacuum system 5 is switched on is present. Air and any remaining gaseous release agent residues are removed withdrawn from the casting chamber through the mold cavity, which in turn is indicated by arrows.
  • FIG. 3d The filling of the casting chamber 1 with liquid metal is shown in FIG. 3d.
  • the inner walls of the casting chamber and the free surface of the Casting pistons are in this operating state with condensed release agent document that prevents a disturbing effect of the metal.
  • 3f finally shows the die casting system with the mold 2 open (hatched). The solidified casting can be removed.
  • FIG. 4 shows three operating positions of a die casting system according to the invention shown, the casting chamber 21 one of the metal filling opening spatially separate connection for introducing a vaporized separating material owns.
  • Fig. 4a shows the die casting system at the time of initiating a evaporated (gaseous) release agent according to the invention by an
  • FIG. 4a corresponds insofar as the operating state shown in Fig. 3a.
  • the plunger 27 has advanced somewhat from its rest position closes the metal filling opening 26; this way becomes a special one high pressure drop between the vacuum system 25 and the casting chamber 21 reached.
  • the die casting system according to the invention is again at the time the introduction of a vaporized (gaseous) release agent according to the invention shown.
  • the plunger 27 is in its rest position and the vacuum system 25 is switched off. To that extent corresponds to 4b the state shown in Fig. 3b.
  • the separating material is swirled inside the casting chamber 21, that spreads from the point of discharge. What has been said about FIG. 3b applies analogous.
  • FIG. 4c shows the filling of the casting chamber 21 with liquid Shown in metal.
  • the casting piston 21 is in its rest position and opens the metal fill opening 26.
  • Fig. 4c corresponds - except for the other arrangement of the separator line - Fig. 3d.
  • FIG. 5 shows a device 28 for evaporating a release agent. It corresponds to device 8 according to FIG. 1.
  • the separator evaporator 28 comprises a housing 31 made of a thermal insulating material that has an interior 32 for receiving a solid or liquid evaporable release agent.
  • the fixed or Liquid release agent can be fed into the interior 32 by means of a feed 33 be entered.
  • a carrier gas supply line 35 is also provided, by the carrier gases from a carrier gas source, not shown (for example a gas bottle) passed into the interior of the evaporator become.
  • a separator gas line leads from the interior of the evaporator downwards 36 for a die casting unit not shown in FIG. 5, cf. 1.
  • Feed 33, carrier gas supply line 35 and separator line 36 can independently of one another by means of controllable shut-off elements 43, 45 and 46 either locked or opened.
  • shut-off element 43 of the feeder 33 When filling the solid or liquid separator is in the interior of the evaporator 28, for example only the shut-off element 43 of the feeder 33 is opened. After filling a batch of release agent to be evaporated is closed. Then be the heating elements 34, 34 'are activated and the release material evaporates, whereupon the shut-off element 46 of the separator gas line 36 and, if appropriate, that Shut-off element 45 of the carrier gas supply line 35 can be opened.
  • the gaseous Release agent is then - optionally mixed with carrier gas - under Pressure is introduced into the die casting unit, not shown in FIG. 5, see. in particular FIGS. 3 and 4.
EP99109269A 1998-08-31 1999-05-26 Verfahren zur Applikation eines Trenn- oder Schmierstoffs Expired - Lifetime EP0983812B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19840869 1998-08-31
DE19840869 1998-08-31

Publications (2)

Publication Number Publication Date
EP0983812A1 true EP0983812A1 (de) 2000-03-08
EP0983812B1 EP0983812B1 (de) 2002-11-27

Family

ID=7880145

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Application Number Title Priority Date Filing Date
EP99109269A Expired - Lifetime EP0983812B1 (de) 1998-08-31 1999-05-26 Verfahren zur Applikation eines Trenn- oder Schmierstoffs

Country Status (5)

Country Link
EP (1) EP0983812B1 (un)
JP (1) JP2000071055A (un)
AT (1) ATE228410T1 (un)
DE (2) DE19906770C2 (un)
ES (1) ES2186276T3 (un)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1086765A1 (de) * 1999-09-22 2001-03-28 Linde Gas Aktiengesellschaft Verfahren zur Verbesserung des Magnesium-Druckgussprozesses
US6460596B1 (en) 1999-10-21 2002-10-08 The Japan Steel Works, Ltd. Method of coating powder lubricant in metallic injection molding machine and die used of metallic injection molding
EP1820584A1 (de) * 2006-02-21 2007-08-22 Tribo-Chemie GmbH Kaltkammer-Druckgießmaschine, Kaltkammer-Druckgießverfahren, und Kolbenschmiermittel dafür

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007020586A1 (de) * 2007-05-02 2008-11-06 Ashland-Südchemie-Kernfest GmbH Beschichtungsmassen für Gießformen und Kerne zur Vermeidung von Reaktionsgasfehlern

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5662156A (en) * 1995-12-05 1997-09-02 Freeman; Lewis Gene Method of die casting machine lubrication with unitized lubricant
JPH09276981A (ja) * 1996-04-19 1997-10-28 Taiho Kogyo Co Ltd 金型成型用離型剤および鋳造プランジャ潤滑剤

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3812634A1 (de) * 1988-04-15 1989-10-26 Sued Chemie Ag Verfahren zur herstellung von giessformen aus tongebundenem formsand
DE4016368A1 (de) * 1989-05-19 1990-12-13 Theophil Bauer Spruehkopf einer spruehvorrichtung zum aufspruehen von fluessigkeiten, insbesondere trennmitteln

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5662156A (en) * 1995-12-05 1997-09-02 Freeman; Lewis Gene Method of die casting machine lubrication with unitized lubricant
JPH09276981A (ja) * 1996-04-19 1997-10-28 Taiho Kogyo Co Ltd 金型成型用離型剤および鋳造プランジャ潤滑剤

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BEDNARECK H: "VERBESSERTE KOLBENSCHMIERUNG BEIM DRUCKGIESSEN - ERFAHRUNGEN MIT TRENNSTOFF-PELLETS UND EINEM PASSENDEN DOSIERGERAET", GIESSEREI,DE,GIESSEREI VERLAG. DUSSELDORF, vol. 84, no. 17, pages 43-46, XP000703831, ISSN: 0016-9765 *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 02 30 January 1998 (1998-01-30) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1086765A1 (de) * 1999-09-22 2001-03-28 Linde Gas Aktiengesellschaft Verfahren zur Verbesserung des Magnesium-Druckgussprozesses
US6460596B1 (en) 1999-10-21 2002-10-08 The Japan Steel Works, Ltd. Method of coating powder lubricant in metallic injection molding machine and die used of metallic injection molding
DE10052130C2 (de) * 1999-10-21 2002-11-14 Japan Steel Works Ltd Kokille zum Metallspritzgießen und Verfahren zum Betreiben einer Metallspritzgießvorrichtung
EP1820584A1 (de) * 2006-02-21 2007-08-22 Tribo-Chemie GmbH Kaltkammer-Druckgießmaschine, Kaltkammer-Druckgießverfahren, und Kolbenschmiermittel dafür

Also Published As

Publication number Publication date
EP0983812B1 (de) 2002-11-27
ES2186276T3 (es) 2003-05-01
DE59903523D1 (de) 2003-01-09
JP2000071055A (ja) 2000-03-07
DE19906770A1 (de) 2000-03-02
ATE228410T1 (de) 2002-12-15
DE19906770C2 (de) 2003-03-27

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