EP0951959A1 - Appareil pour couler de matériaux métalliques - Google Patents

Appareil pour couler de matériaux métalliques Download PDF

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Publication number
EP0951959A1
EP0951959A1 EP98107317A EP98107317A EP0951959A1 EP 0951959 A1 EP0951959 A1 EP 0951959A1 EP 98107317 A EP98107317 A EP 98107317A EP 98107317 A EP98107317 A EP 98107317A EP 0951959 A1 EP0951959 A1 EP 0951959A1
Authority
EP
European Patent Office
Prior art keywords
pressure chamber
vessel
wall
cuvette
mold
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Withdrawn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
EP98107317A
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German (de)
English (en)
Inventor
Erfindernennung liegt noch nicht vor Die
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.)
SPEEDform GmbH
Original Assignee
SPEEDform 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 SPEEDform GmbH filed Critical SPEEDform GmbH
Priority to EP98107317A priority Critical patent/EP0951959A1/fr
Publication of EP0951959A1 publication Critical patent/EP0951959A1/fr
Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould

Definitions

  • the invention relates to a device for casting metallic Materials according to the preamble of the first claim.
  • Molds are usually used to cast metal workpieces made of plaster or ceramic mass.
  • a wax model in placed in a cuvette and cast with plaster.
  • the cuvette has a cylindrical, perforated steel jacket. After the wax model has melted the cuvette is turned over and cast with metal in a vacuum chamber.
  • the task is solved by a device with the characteristic Features of the main claim.
  • the elastic inner wall of the cuvette it is possible to support the shape on its outside in spite of the vacuum applied, that due to the internal pressure only pressure forces on the molding material, but no tensile forces act
  • the highly pressure-resistant, but very against tensile forces sensitive molding compound is not damaged.
  • the new cuvette makes it possible not only different lengths of molds, but it is also a given some leeway in diameter because of the elastic inner wall the mold has a centering effect.
  • Another advantage is the ease of demolding. Especially with Larger molds were often difficult to cast after being cast in the steel shell separate molded material, separate the cuvette and the finished casting. Thanks to the elastic inner wall, the shape can now be removed from the cuvette without any problems removed and quenched from the casting.
  • the elastic inner wall can, for example, only in the area of the upper opening the cuvette must be tightly connected to the outer wall, so that between the Cell wall and the elastic inner wall creates an airtight space.
  • the elastic inner wall can also be double-walled, so that in a very simple embodiment, no connection between the Cell wall and the elastic inner wall must exist.
  • the finished casting mold is inserted into the cuvette and firmly attached to the pressure chamber be connected to accommodate the crucible. After that, the gap filled with compressed air, so that the mold is centered and fixed independently is pushed up. This way you can use a single cell size completely different molds in the corresponding, necessary for casting Position below the crucible.
  • the mold For a quick and clean casting process, the mold must be in front of the Pouring to be evacuated. So that the elastic inner wall is not a hindrance or has a delaying effect, has the side in contact with the casting mold air-conducting channels that are designed in this way. that it exits the mold Direct air directly to a hole that is connected to a vacuum source.
  • the bottom of the cuvette is curved outwards so that if possible, a cell interior without edges is created. Should this effect still be strengthened, it is also advantageous to cast the mold in a vessel with curved To manufacture floor, so that the mold itself has no sharp edges.
  • the pressure chamber for receiving the crucible is advantageous with a central opening in its bottom.
  • the cuvette is also included closed a lid that has an opening in the middle.
  • the melting pot has on its underside a funnel-shaped extension, which is ready to cast the device through the opening in the bottom of the pressure chamber into the opening of the cell lid protrudes.
  • the arrangement is designed so that it is in the chamber built up pressure only over the funnel-shaped extension of the crucible in the can reproduce the casting mold located in the cuvette.
  • Both the cuvette and the pressure chamber have a flange, the Connection is established via an intermediate seal. This seal causes the pressure resistance of the system to the outside.
  • the pressure chamber for holding the crucible is with an induction heater provided that a simple melting of the metallic material in the crucible under vacuum.
  • the pressure chamber is with both a pressure and a vacuum source connectable while the cuvette is only connected to a vacuum source can be. This way it becomes possible to melt the metal underneath Vacuum, while evacuating the shape. For the casting process can then pressurize the pressure chamber and continue the shape be evacuated.
  • the device has a pressure chamber 1 and a cuvette 20 which Brackets 3 can be connected. Also about brackets 3 can on the Pressure chamber, a cover 2 is placed and pressure-tight with the sealing ring 5 Chamber are connected. For this purpose, both on the cover 2 and on the Wall of the pressure chamber each provided an unspecified flange which is gripped by the bracket 3.
  • the bottom 14 of the pressure chamber 1 has a central opening 15.
  • a melting vessel 6 is located on the base 14 within the pressure chamber whose outlet connector 9 projects through the opening 15 in the bottom 14 of the pressure chamber.
  • a drain valve 10 is through the valve body 11 and the drain port 9 and formed the valve stem 12.
  • the loose on the melting vessel 6 and with Pressure compensation openings provided cover 7 of the melting vessel 6 also has a central opening, with a solenoid 13 above the opening the ceiling 7l is connected. When the solenoid 13 is electrically actuated the valve stem 12 lifts and thus opens the drain valve 10.
  • An induction heater 8 is provided on the inner wall of the pressure chamber 1, which heats up the melting vessel to the required temperature.
  • the cuvette 20 has a cylindrical jacket and an outwardly curved one Floor 30 on.
  • the jacket has an outer flange at its upper edge 21 and, lying underneath, an inner flange 22.
  • the lid 23 which in turn has a central opening 26 for the passage of the Drain pipe 9 of the melting vessel 6 has.
  • In the edge area of the lid there is a bore 27.
  • the cover 23 is dimensioned so that it is flush ends with the upper edge of the outer flange 23.
  • an elastic sealing plate 19 is arranged between the bottom 14 of the pressure chamber 1 and the lid 23 of the cuvette, and the surface of the outer flange 23, an elastic sealing plate 19 is arranged.
  • the opening 24 of the sealing plate has a diameter that is designed in this way is that the drain port 9 is tightly enclosed. This will be a pressure transition between the pressure chamber 1 and the cuvette 20 only possible via the outlet connection 9.
  • the sealing plate 19 also has an opening above the opening 27 in the cover 23 25. This opening leaves an air channel between the cuvette 20 and the bore 27 free in the outer wall of the pressure chamber 1.
  • the bore 17 is with the Suction nozzle 18 connected, which is connected to a vacuum source, not shown here is.
  • the connection between the pressure chamber and the cuvette is made via the Brackets 3 constructed, which encompass the flanges 16 and 21.
  • the inner skin 31 On the inner wall of the cuvette 20 is a double-walled, elastic Inner skin 31 attached.
  • the interior 32 of the inner skin 31 can over the Stub 33 are filled with a medium, such as a gas or a fluid.
  • the inner skin is advantageously up to two thirds of the height of the cuvette Glued inside wall.
  • FIG. 2 shows the surface structure of the non-glued side of the inner skin 31 recognize.
  • Channels 34 extending from the center are provided, that open above the inner skin into the free ring channel 29.
  • the sublime Surfaces 35 form the lateral boundaries of the channels 34.
  • the non-glued side can also be provided with round knobs be spaced so that continuous channels are created which also open into the annular space 29. Also a channel structure in the form a diamond-shaped grid can be realized.
  • the casting mold 28 For a casting process, the casting mold 28 must first be placed in the cuvette 20 become. For this purpose, the interior 32 of the elastic inner skin 31 is over the nozzle 33 evacuated. The inner skin 31 thereby lies close to the inner wall of the Cell 22 on. The casting mold 28 can now be conveniently inserted into the cuvette.
  • the interior 32 of the elastic inner skin 22 can now be used, for example Air to be inflated.
  • the mold 28 is centered and is from below pressed against the cover 23.
  • the melting vessel 6 - with the closed Valve 10 attached cover 7 and filled with the required amount of metal - used.
  • the pressure chamber 1 with the help of the sealing ring 5, the cover 2 and the clamps 3 are closed pressure-tight.
  • the pressure chamber is connected to the connector 4 evacuated.
  • the cuvette 20 is opened via the opening 27 in the lid 23, the opening 25 in the sealing plate 19, the bore 17 in the wall of the pressure chamber and evacuated the suction port 18. Over the pores in the ceramic The mass of the casting mold and the channels 34 also build a vacuum in the cavities 36 on.
  • the valve 10 When the metal has reached the liquid state of aggregation, it is maintained of the negative pressure on the suction port 18, the valve 10 is opened and an overpressure is simultaneously built up in the pressure chamber 1 via the connecting piece 4. As a result, the liquid metal flows into the cavities at great speed 36 pressed until they are completely filled - without air pockets. The valve 10l is closed again and the excess pressure in the pressure chamber 1 is reduced. Now the cuvette can also be subjected to atmospheric pressure.
  • the interior 32 of the elastic inner skin 31 evacuated, so that the now filled mold 28 freely in the The cuvette is standing. After the metal solidifies, but before it cools down the mold is removed from the cuvette and immersed in cold water for demolding. The mold breaks and releases the workpieces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dental Prosthetics (AREA)
EP98107317A 1998-04-22 1998-04-22 Appareil pour couler de matériaux métalliques Withdrawn EP0951959A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98107317A EP0951959A1 (fr) 1998-04-22 1998-04-22 Appareil pour couler de matériaux métalliques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98107317A EP0951959A1 (fr) 1998-04-22 1998-04-22 Appareil pour couler de matériaux métalliques

Publications (1)

Publication Number Publication Date
EP0951959A1 true EP0951959A1 (fr) 1999-10-27

Family

ID=8231799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98107317A Withdrawn EP0951959A1 (fr) 1998-04-22 1998-04-22 Appareil pour couler de matériaux métalliques

Country Status (1)

Country Link
EP (1) EP0951959A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1810765A2 (fr) 2006-01-24 2007-07-25 LMC Technology LLC Procédé et appareil pour moulage de pression pulsée
US9555472B2 (en) 2011-05-27 2017-01-31 Aalto University Foundation Arc melting and tilt casting apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2300666A1 (de) * 1973-01-08 1974-07-11 Inresa Alfons Schultheiss Kg Schmelz- und giessvorrichtung
EP0387107A2 (fr) * 1989-03-10 1990-09-12 Daido Tokushuko Kabushiki Kaisha Procédé et dispositif pour la coulée de métal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2300666A1 (de) * 1973-01-08 1974-07-11 Inresa Alfons Schultheiss Kg Schmelz- und giessvorrichtung
EP0387107A2 (fr) * 1989-03-10 1990-09-12 Daido Tokushuko Kabushiki Kaisha Procédé et dispositif pour la coulée de métal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1810765A2 (fr) 2006-01-24 2007-07-25 LMC Technology LLC Procédé et appareil pour moulage de pression pulsée
EP1810765A3 (fr) * 2006-01-24 2008-05-21 LMC Technology LLC Procédé et appareil pour moulage de pression pulsée
US9555472B2 (en) 2011-05-27 2017-01-31 Aalto University Foundation Arc melting and tilt casting apparatus

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