EP0484695A1 - Dispositif et procédé pour fabriquer des moules carapaces - Google Patents

Dispositif et procédé pour fabriquer des moules carapaces Download PDF

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Publication number
EP0484695A1
EP0484695A1 EP91117434A EP91117434A EP0484695A1 EP 0484695 A1 EP0484695 A1 EP 0484695A1 EP 91117434 A EP91117434 A EP 91117434A EP 91117434 A EP91117434 A EP 91117434A EP 0484695 A1 EP0484695 A1 EP 0484695A1
Authority
EP
European Patent Office
Prior art keywords
sand
hot air
hood
model plate
resin
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.)
Withdrawn
Application number
EP91117434A
Other languages
German (de)
English (en)
Inventor
Reiner Rommel
Werner Landua
Werner Pichler
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.)
Adolf Hottinger Maschinenbau GmbH
Original Assignee
Adolf Hottinger Maschinenbau 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 Adolf Hottinger Maschinenbau GmbH filed Critical Adolf Hottinger Maschinenbau GmbH
Publication of EP0484695A1 publication Critical patent/EP0484695A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C13/00—Moulding machines for making moulds or cores of particular shapes
    • B22C13/08—Moulding machines for making moulds or cores of particular shapes for shell moulds or shell cores
    • 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
    • B22C9/123—Gas-hardening

Definitions

  • the invention relates to a process for the production of mold masks, in which a sand-resin mixture is applied to a hot model plate, a sand mask of the desired thickness is formed by melting the resin and excess sand is removed, and a device for the production of mold masks with a hot model plate.
  • a pourable and dry sand-resin mixture is applied to a hot model plate.
  • the resin melts and changes from its resol state (A state) to the resitol state (B state).
  • the heating of the sand progresses outwards from the model plate.
  • the mask is then post-hardened, whereby the resin changes into the hard, infusible, resit state (C state) and can then be lifted off the model plate.
  • the post-curing takes place by applying heat to the side of the sand mask facing away from the model plate by means of gas heating, heat radiation, gas or electric radiators, such as heating spirals or the like, arranged above the sand mask, which radiate their heat onto the sand mask.
  • gas heating, heat radiation, gas or electric radiators such as heating spirals or the like
  • This caused quite uneven heating of different areas of the sand mask, depending on whether the areas were located closer or further away from the heater.
  • Surfaces arranged with a greater inclination to the heating plane were also poorly heated, since the heat radiated in per unit area is less than regions of the sand mask arranged parallel to the heating plane.
  • the object of the invention is to achieve uniform application of heat to the sand mask and thus uniform curing while avoiding the aforementioned disadvantages.
  • the stated object is achieved in a method of the generic type in that hot air is blown onto the sand mask formed in order to cure the resin.
  • a generic device solves the problem with a hot air device.
  • the sand mask is not irradiated with heat, but rather the heat is transmitted through the air supplied to the sand mask, that is to say by convection and preferably forced convection, uniform heating of the Sand mask can be achieved regardless of levels of individual mask areas or alignment thereof relative to a reference plane.
  • a further development of the method provides that a largely closed space is formed above the sand mask before hot air is inflated.
  • the device according to the invention is designed in such a way that the hot air device is or can be connected via a line to a hood which can be brought over the model plate. If the hood is to be placed as close as possible to the model plate for heating, then it must be removable from it for the application of the sand-resin mixture.
  • the line can either be a flexible hose, such as a corrugated hose, or another type, provided that the hose is made of material that is resistant to between 220 and 400 degrees, depending on the resin, at the required temperature.
  • connection between the hot air device and the hood has separable insulated pipes which form a continuous connection for the hot air when the hood is lowered onto the mold plate, a further development being distinguished in particular by the end faces of pipe parts being inclined to the vertical their axis are designed so that they can be moved along to each other up to a tight connection of the pipe parts.
  • the device according to the invention has, in a manner known per se, a frame 1 which carries a carrier 2 for a model plate 3 (FIG. 2) and a sand hood 4.
  • Carrier 2 and sand hood 4 are both six-jointed, so that they can be closed by applying a sand-resin mixture to the model plate 3 and pouring the excess sand back into the hood 4 by pivoting about the axis 6.
  • the carrier 2 has an underheater for heating the model plate 3.
  • a hopper 7 is further arranged, which is in the open position of the hood 4 above the opening thereof, so that the sand-resin mixture can be filled from the funnel 7 into the open hood 4.
  • a heating hood 11 On the frame 1 there are also - approximately at the level of the funnel 7 - parallel rails 8 on which carriages 9 for a heating hood 11 can be moved horizontally.
  • the carriages 9 have rollers 15 along which the hood 11 can be lowered and raised by means of vertically directed rails 12 connected to it.
  • a supply air nozzle 13 On the top of the hood 11, a supply air nozzle 13 is attached. Below the mouth 14 of the air inlet 13 there is a chicane 14, through which the hot air supplied through the nozzle 13 is distributed over the entire surface of the hood 11.
  • a hot air device 16 is provided to the side of the frame 1, which has an outlet pipe 17 which is guided next to the travel space of the hood 11 and there has a transfer opening 18 which interacts with a receiving opening 19 of the feed connector 13 when the hood 11 is on the model plate 3 is lowered.
  • the end faces of the transfer opening 18 and the receiving opening 19 are aligned obliquely in the same way, the upper region of the transfer opening 18 being set back further, that is to say shortened further than the lower region of the opening.
  • the sand-resin mixture is applied to the heated model plate 3 in a known manner.
  • sand is filled into the hood 4 from the funnel 7.
  • Carrier 2 for the model plate 3 and hood 4 are closed by pivoting about the axis 6.
  • the sand-resin mixture is applied to the model plate 3 by pivoting further.
  • the resin softens and binds a certain layer of sand on the model plate 3. Excess sand and resin remain in the latter when the carrier 2 and hood 4 are subsequently opened.
  • the hot air hood 11 is then lowered onto the model plate 3 and thus over the resin-sand layer or sand shell located thereon, by lowering the rails 12 connected to the hood 11 along rollers 15 until the openings 18, 19 are aligned with one another and the Establish the continuous hot air path mentioned.
  • the hot air device 16 is put into operation and hot air 16 is in via the pipes 17, 18, 19, 13 in the hood 11 blown. When entering, it is distributed by chicane 14 over the entire hood space, so that it hits the sand bowl on the model plate 3 evenly. This results in a very uniform melting and hardening of the resin in its hard, infusible resit state (C state).
  • the hood 11 is raised again and then the sand shell or mask can be lifted off the model plate 3 and assembled as a mold mask part with other mold mask parts for complete molding in order to cast the desired part to be produced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
EP91117434A 1990-10-25 1991-10-12 Dispositif et procédé pour fabriquer des moules carapaces Withdrawn EP0484695A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4033888 1990-10-25
DE19904033888 DE4033888A1 (de) 1990-10-25 1990-10-25 Verfahren und vorrichtung zur sandmaskenherstellung

Publications (1)

Publication Number Publication Date
EP0484695A1 true EP0484695A1 (fr) 1992-05-13

Family

ID=6416995

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91117434A Withdrawn EP0484695A1 (fr) 1990-10-25 1991-10-12 Dispositif et procédé pour fabriquer des moules carapaces

Country Status (3)

Country Link
EP (1) EP0484695A1 (fr)
JP (1) JPH04262833A (fr)
DE (1) DE4033888A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1059189A (fr) * 1952-06-24 1954-03-23 Tech Modernes De Fonderie Machine pour la confection de moules de fonderie à l'aide de noyaux extérieurs
GB745288A (en) * 1952-12-02 1956-02-22 Alfred Bartlett Smith Improvements relating to the manufacture of shell moulds
GB799861A (en) * 1954-11-09 1958-08-13 Clifford Ross Smith Improvements relating to stoves for drying foundry moulds and cores
CH654501A5 (en) * 1981-11-19 1986-02-28 Sintokogio Ltd Process for mould production
JPS62176634A (ja) * 1986-01-28 1987-08-03 Sintokogio Ltd シエル中子の造型方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1002161A (fr) * 1946-08-06 1952-03-03 Procédé de confection de noyaux creux et de carapaces de moules de fonderie ou de pièces moulées de toute nature
DE1247560B (de) * 1962-05-17 1967-08-17 Nat Acme Co Maschine zum Herstellen von Schalenkernen
US3850224A (en) * 1973-07-30 1974-11-26 Sherwood Refractories Process and apparatus for drying shell molds
US4114285A (en) * 1976-08-09 1978-09-19 United Technologies Corporation Method and apparatus for drying investment casting molds

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1059189A (fr) * 1952-06-24 1954-03-23 Tech Modernes De Fonderie Machine pour la confection de moules de fonderie à l'aide de noyaux extérieurs
GB745288A (en) * 1952-12-02 1956-02-22 Alfred Bartlett Smith Improvements relating to the manufacture of shell moulds
GB799861A (en) * 1954-11-09 1958-08-13 Clifford Ross Smith Improvements relating to stoves for drying foundry moulds and cores
CH654501A5 (en) * 1981-11-19 1986-02-28 Sintokogio Ltd Process for mould production
JPS62176634A (ja) * 1986-01-28 1987-08-03 Sintokogio Ltd シエル中子の造型方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 18 (M-660)[2865], 20. Januar 1988; & JP-A-62 176 634 (SINTOKOGIO LTD) 03-08-1987 *

Also Published As

Publication number Publication date
JPH04262833A (ja) 1992-09-18
DE4033888A1 (de) 1992-04-30

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