Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D35/00—Equipment for conveying molten metal into beds or moulds
  • B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D39/00—Equipment for supplying molten metal in rations

Definitions

• the present invention relates to counter-gravity casting and more specifically the supply of molten metal to the moulds in a plant, in which the moulds are filled by pumping the molten metal into the mould cavities via a filling head temporarily connected to a filling opening in the mould, the moulds being held stationary and the filling head being moved axially and possibly laterally for providing the temporary connection.
• the molten metal is transferred to the pump oven and pumped through the filling tube and filling head into the moulds.
• the ovens are preferably constructed as substantially closed containers.
• Figure 1 is a diagrammatic side view of a mould string and apparatus for supplying molten metal to the mould string in accordance with the invention
• Figure 2 illustrates different positions of the flexibility for providing the possibility of performing the lateral and axial movement, respectively, of the filling head
• FIG. 3 illustrates a preferred embodiment of an apparatus in accordance with the invention
• Figure 4 shows an arrangement with turning movement of the filling head, filling tube and pump
• Figure 5 shows an arrangement with tilting movement of the filling head, filling tube and pump
• Figure 6 shows an arrangement with linear movement of the filling head, filling tube and pump in a plane forming an angle with the horizontal plane.
• the mould-string plant shown in Figure 1 is considered to be well-known and will, therefore, not be explained in detail.
• the mould cavities 1 are filled with molten metal, in order to produce the desired moulded articles.
• a filling head 2 is brought into engagement with a filling opening 3 in the mould and the molten metal is pumped into the mould through the filling head 2.
• the mould is filled by pumping the molten metal into the mould cavity and the filling opening 3 is closed in a convenient manner as e.g. known from EP-760723.
• the pump 8 pressure is reduced and the filling head 2 may be retracted from the mould ready for engagement with the next mould in the string 4.
• the molten metal for filling the moulds is provided by melting raw material metal in a melting oven 5, from which the molten metal is transferred to a buffer oven 6, in which the molten metal is prepared for casting by temperature regulation, degasification, alloy addition, mixing, etc.
• molten metal is transferred to the pump oven 7, which has a relatively low capacity, from which the molten metal is pumped 8 to the filling head 2 via a filling tube 9.
• the pumping may be performed by means of an electromagnetic pump 8 or a pressure activated pump which is immersed into the molten metal and is connected to the filling tube 9 and filling head 2.
• Another possibility of pumping the molten metal from the pump oven 7 is by setting the inside of the pump oven 7 under pressure whereby the molten metal will rise up into an immersed filling tube 9 connected to the filling head 2. This last pumping method presupposes that the pump oven 7 can be completely closed, in order to be able to create a sufficient over-pressure inside the pump oven 7.
• each of the ovens 5, 6 and 7 are constructed as closed containers, in order to be able to control the atmosphere above the molten metal.
• the connections between the different ovens are made from rigid materials, due to the fact that all elements in contact with the molten metal must be made of ceramic material or the like, which is able to withstand the influences from the molten metal.
• the whole system of ovens may be made gas-tight without flexible seals. This would, however, require that in order to provide the lateral and axial movement of the filling head 2, the whole system consisting of melting oven 5, buffer oven 6 and pump oven 7, including pump 8 and filling tube 9, should be moved both laterally and axially to provide the desired lateral and axial movement of the filling head 2.
• the movability needed to provide a lateral and axial movement of the filling head 2, respectively can be provided between any two successive mutually connected components, i.e. filling head 2-filling tube 9, filling tube 9-pump 8, pump 8-pump oven 7, pump oven 7- buffer oven 6, and buffer oven 6-melting oven 5. It must here be emphasized that the movability for the lateral movement need not be provided at the same place as the movability for the axial movement. By splitting the movability up, the movability can be made as a purely linear movability in each of the movability points in the system.
• the movability for this movement is preferably positioned as close as possible to the filling head 2 in order to reduce the mass to be moved.
• the axial movement is provided by movement of the pump 8, the filling tube 9 and the filling head 2 as one unit relative to the pump oven 7, and a possible sealing 10 between the pump 8 and the pump oven 7 is provided by having the pump mounted in a movable lid 11 on the pump oven 7.
• the lateral movement may be provided by moving the pump oven 7 and a movable connection may be provided between the pump oven 7 and the buffer oven 6, e.g. by means of a linkage connection 14.
• the sealing 10 between the pump 8 and the pump oven 7 is preferably provided by mounting the pump 8 in a lid 11 which is slidingly movable relative to the pump oven 7, and the sealing 10 between the lid 11 and the pump oven 7 is provided in the form of a flexible fibre-ceramic sealing mounted on one part and in sliding engagement with the other part.
• FIG. 3 An example of such a construction is shown in Figure 3, in which the pump 8 is mounted in a pump lid 11 which is laterally and axially movable together with the pump 8.
• Two pump oven lids 12, 13 are provided to the lateral sides of the pump lid 11, these pump oven lids 12, 13 being movable only in the lateral direction.
• the pump lid 11 is provided with flanges at the front and back, which are slidingly engaging flexible sealing elements 10 mounted on the corresponding top edges of the pump oven 7. Furthermore, the side edges of the pump lid 11 are provided with vertical flanges slidingly engaging flexible sealing elements 10 mounted on the corresponding adjacent vertical edges of the two pump oven lids 12, 13.
• the two pump oven lids 12, 13 are provided with flanges at the front and back, which are slidingly engaging the above-mentioned flexible sealing elements 10 mounted on the corresponding top edges of the pump oven 7, and these lids are further provided with flexible sealing elements 10 along their edges opposite the edges engaging the pump lid 11 , said sealing elements 10 sealingly engaging a large surface flange positioned to the lateral sides of the pump oven 7.
• these lids 12, 13 are provided with rollers running on rails positioned along the front and back edges of the pump oven 7 on the outside of the sealing elements 10.
• the pump lid 11 is fixed to the pump 8 which is mounted on a two- axes-slide system for providing the lateral and axial movement of the filling head 2, filling tube 9, pump 8 and pump lid 11 together, the pump oven lids 12, 13 being connected to that part of the slide system which is providing the lateral movement.
• the construction shown has the further function of permitting removal of the pump 8 and pump lid 11 from the pump oven 7, whereafter the two pump oven lids 12, 13 can be brought together to close off the pump oven 7 from the surroundings. This will be an advantage in connection with starting up and closing down the system.
• the flexible sealing elements 10 are preferably made of a fibre-ceramic material.
• Figure 4 shows how a pivotal movement of the pump 8, filling tube 9 and filling head 2 in connection with an appropriate construction of the filling tube 9 provides an axial movement of the filling head 2. Furthermore, Figure 4 shows a linkage connection 14 between the buffer oven 6 and the pump oven 7 for providing the necessary flexibility between those two parts in order to be able to move the pump oven 7 in the lateral direction and keeping the buffer oven 6 stationary.
• Figure 5 shows a corresponding construction, in which the pivotal movement of the pump 8, filling tube 9 and filling head 2 is performed in a vertical plane, i.e. a tilting of those parts relative to the pump oven 7.
• Figure 6 shows a linear movement of the same components, where the movement is performed in a plane forming an angle with the horizontal plane.
• Many other types of movement can be envisaged by a man skilled in the art.
• the sealing 10 between the moving and the stationary parts will have to be constructed in accordance with the necessary movement.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Reciprocating Pumps (AREA)
• Basic Packing Technique (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Applications Claiming Priority (1)

Publications (2)

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• 1999
  • 1999-03-29 AU AU30251/99A patent/AU3025199A/en not_active Abandoned
  • 1999-03-29 DE DE69903980T patent/DE69903980T2/de not_active Expired - Fee Related
  • 1999-03-29 EP EP99911636A patent/EP1165275B1/de not_active Expired - Lifetime
  • 1999-03-29 WO PCT/DK1999/000183 patent/WO2000058042A1/en active IP Right Grant
  • 1999-03-29 JP JP2000607781A patent/JP2002539953A/ja active Pending

Non-Patent Citations (1)

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