EP0931606A1 - Vorrichtung zum Behandeln von Dauerformen - Google Patents

Vorrichtung zum Behandeln von Dauerformen Download PDF

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Publication number
EP0931606A1
EP0931606A1 EP99101069A EP99101069A EP0931606A1 EP 0931606 A1 EP0931606 A1 EP 0931606A1 EP 99101069 A EP99101069 A EP 99101069A EP 99101069 A EP99101069 A EP 99101069A EP 0931606 A1 EP0931606 A1 EP 0931606A1
Authority
EP
European Patent Office
Prior art keywords
permanent molds
release agent
permanent
molds
cooling
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
EP99101069A
Other languages
English (en)
French (fr)
Other versions
EP0931606B1 (de
Inventor
Fabio Giolo
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.)
IMR SpA
Original Assignee
IMR SpA
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 IMR SpA filed Critical IMR SpA
Publication of EP0931606A1 publication Critical patent/EP0931606A1/de
Application granted granted Critical
Publication of EP0931606B1 publication Critical patent/EP0931606B1/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
    • B22C—FOUNDRY MOULDING
    • B22C23/00—Tools; Devices not mentioned before for moulding
    • B22C23/02—Devices for coating moulds or cores

Definitions

  • the present invention relates to an apparatus for preparing permanent molds in low-pressure and gravity die-casting units.
  • Cooling is indispensable, since the permanent mold, which is usually made of a copper alloy, has heated by receiving the molten metal inside it.
  • the cooling must be as uniform as possible, because if there are colder spots in the permanent mold, when the molten metal is poured into it its inflow slows in those spots and cooling occurs earlier than in the remaining regions, leading to a finished product which has an unacceptable surface finish.
  • Graphitization of the permanent mold instead consists in depositing thereon a film of graphite which acts as a release agent, i.e., prevents the product obtained by casting molten metal from sticking to it.
  • Cooling and graphitization are currently performed by immersion.
  • the permanent molds are in fact immersed in a tank containing a mix of water and graphite for a certain time, which must be sufficient to ensure its cooling and the adhesion of a layer of graphite on the surface of the permanent mold.
  • cooling and graphitization are in fact performed simultaneously and the cooling time coincides with the graphitization time.
  • oxides, impurities and slag deposit on the permanent molds owing to the destruction of the layer of graphite, causing a deterioration of the surface quality of the products obtained with the molten metal and causing uneven cooling and a consequent higher likelihood of cracks.
  • Each permanent mold must therefore be removed to be placed in a peening machine, in which metal pellets are propelled against it, separating the slag attached to it.
  • the permanent molds are made of an aluminum alloy, graphitization is not used; other types of release materials are used instead.
  • the aim of the present invention is to provide an apparatus for preparing permanent molds in casting units solving the drawbacks noted above in conventional types.
  • an important object of the present invention is to provide an apparatus capable of cleaning the permanent molds and of coating them with a layer of release agent in a fully automatic manner at each casting cycle.
  • a further object is to provide an apparatus which can include means for cooling the permanent molds in a fully automatic manner before cleaning them.
  • a further object of the present invention is to provide an apparatus for preparing permanent molds for casting which cools and coats them with a layer of release agent with two fully mutually independent operations.
  • a further important object of the present invention is to provide an apparatus for preparing permanent molds for casting units which is repeated at each cycle in order to achieve the maximum cleanliness of the permanent molds and avoid peening them.
  • a further object of the present invention is to provide an apparatus for preparing permanent molds which can be used for all kinds of currently available low-pressure and gravity die-casting units.
  • an apparatus for preparing permanent molds in casting units characterized in that it comprises:
  • an apparatus comprises, in this embodiment: means 10 for cooling the permanent molds 11 by means of a distribution of low-pressure nebulized water; means 12 for flushing the permanent molds 11 by distributing water in high-pressure jets; and, in this case, means 13 for graphitizing (coating) the permanent molds 11 by means of a pressurized distribution of a nebulized mix of graphite and liquid.
  • the permanent molds 11 are made of a copper alloy.
  • the cooling means 10 comprise a low-pressure pump 14 (conveniently operating at a pressure on the order of a few bars) which is connected to sprinkler nozzles 15.
  • the flushing means 12 are constituted in this case, for each portion of the permanent molds 11, by a high-pressure pump 16 which is connected to a movable manifold 17 which is provided with spray nozzles 18.
  • the manifold 17 can move at right angles to its extension, so as to affect the entire surface of each portion of the permanent molds 11 arranged in front of it by means of a respective movement unit 19 by means of a rotation from an active position, in which the permanent mold 11 is in a vertical configuration, to a flushing position, in which it is horizontal so that the surface to be flushed faces downward.
  • the high-pressure pump 16 is advantageously constituted by a double-acting piston pump with a pressure conveniently between 80 and 120 bar and deliveries which converge into a single duct, particularly the manifold 17.
  • the graphitization means 13 instead comprise a compressed-air unit, not shown in the figures for the sake of simplicity, which is combined with a device 20 for feeding a liquid-graphite mix from which the vertical portion of a flexible hose 21 draws; its horizontal portion, after a guiding element 22, ends with a nozzle 23 which is installed on a universal joint 23a which is in turn mounted on a disk 24 motorized by means of a gearmotor 25.
  • a nozzle 23 which is installed on a universal joint 23a and is connected to a disk 24 and a gearmotor 25 and is connected by means of the flexible hose 21 to the feeder device 20.
  • the sprinkler nozzles 15, the manifolds 17, the nozzles 23 are contained in a single enclosed tank 26 which is provided, on its bottom, with a discharge duct 27 with a filter 28 and a settling tank 29.
  • a pipe 30 returns the water collected therein to the high-pressure pump 16 and to the low-pressure pump 14.
  • Movable protections 31 affect the region of the paths along which the portions of the permanent molds 11 move from the active position to the flushing position.
  • the movable protections 31 can rotate with respect to a horizontal axis and are actuated by a fluid-driven jack 32 between a position which does not interfere with said path and a position adapted to complete the enclosure of the tank 26.
  • All the process variables are controlled and actuated by means of an electronic apparatus which is shown schematically in the figures and is designated by the reference numeral 33; said apparatus is connected to control means constituted, for example, by television cameras 34.
  • the apparatus described with the present invention can be used in all currently existing casting units, both for low-pressure die-casting and for gravity die-casting.
  • the permanent molds are made of an aluminum alloy or of other materials, different types of release agent are used.
  • a further important advantage is achieved with the present invention in that an apparatus for preparing permanent molds in casting units has been provided which is capable of cooling and flushing the permanent molds and of coating them with a layer of release agent in a fully automatic manner at each casting cycle.
  • a further important advantage obtained with the present invention is that an apparatus for preparing permanent molds has been provided which is used at each casting cycle to achieve maximum cleanliness of the permanent molds and thus avoid peening.
  • the materials employed, so long as they are compatible with the contingent use, as well as the dimensions, may be any according to requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP99101069A 1998-01-27 1999-01-25 Vorrichtung zum Behandeln von Dauerformen Expired - Lifetime EP0931606B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD980011 1998-01-27
IT98PD000011A ITPD980011A1 (it) 1998-01-27 1998-01-27 Apparecchiatura per la preparazione delle conchiglie negli impianti di colata

Publications (2)

Publication Number Publication Date
EP0931606A1 true EP0931606A1 (de) 1999-07-28
EP0931606B1 EP0931606B1 (de) 2003-10-22

Family

ID=11392020

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99101069A Expired - Lifetime EP0931606B1 (de) 1998-01-27 1999-01-25 Vorrichtung zum Behandeln von Dauerformen

Country Status (3)

Country Link
EP (1) EP0931606B1 (de)
DE (1) DE69912165T2 (de)
IT (1) ITPD980011A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100017975A1 (it) * 2021-07-08 2023-01-08 Imr Engineering & Tech S R L Attrezzatura e procedimento per la pulizia e la grafitatura di stampi e/o semistampi per colata in bassa pressione
CN114211569B (zh) * 2021-12-15 2023-10-24 英科医疗科技股份有限公司 一种带有铁氟龙涂层的刀模

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005021688A1 (de) * 2005-05-11 2006-11-16 Volkswagen Ag Einsatz von Trennmitteln im Schwerkraft-Kokillenguss

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3482652A (en) * 1967-11-13 1969-12-09 Rimrock Corp Automatic reciprocating lubricant applicator
FR2252875A1 (en) * 1973-11-30 1975-06-27 Kestrel Sa Slag ladle spray coating - using automatic mechanical spraying appts. having an arrangement to keep coating prod. and air used under pressure
GB2007557A (en) * 1977-11-08 1979-05-23 Mannesmann Ag Cleaning Casting Moulds
JPH06210398A (ja) * 1993-01-19 1994-08-02 Unisia Jecs Corp 鋳造用金型の冷却方法
EP0811447A1 (de) * 1996-06-04 1997-12-10 IMR S.r.l. Niederdruck-Kokillengiessanlage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3482652A (en) * 1967-11-13 1969-12-09 Rimrock Corp Automatic reciprocating lubricant applicator
FR2252875A1 (en) * 1973-11-30 1975-06-27 Kestrel Sa Slag ladle spray coating - using automatic mechanical spraying appts. having an arrangement to keep coating prod. and air used under pressure
GB2007557A (en) * 1977-11-08 1979-05-23 Mannesmann Ag Cleaning Casting Moulds
JPH06210398A (ja) * 1993-01-19 1994-08-02 Unisia Jecs Corp 鋳造用金型の冷却方法
EP0811447A1 (de) * 1996-06-04 1997-12-10 IMR S.r.l. Niederdruck-Kokillengiessanlage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 572 (M - 1696) 2 November 1994 (1994-11-02) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100017975A1 (it) * 2021-07-08 2023-01-08 Imr Engineering & Tech S R L Attrezzatura e procedimento per la pulizia e la grafitatura di stampi e/o semistampi per colata in bassa pressione
CN114211569B (zh) * 2021-12-15 2023-10-24 英科医疗科技股份有限公司 一种带有铁氟龙涂层的刀模

Also Published As

Publication number Publication date
EP0931606B1 (de) 2003-10-22
DE69912165D1 (de) 2003-11-27
DE69912165T2 (de) 2004-08-12
ITPD980011A1 (it) 1999-07-27
ITPD980011A0 (it) 1998-01-27

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