Method, Pressure-supply member and pressure-supply system for active after-feeding of castings
AssigneeGeorg Fischer Disa A/S
InventorsOle Anders Jacobsen, Peter Møller Iversen, Uffe Andersen
Life of this patent
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Abstract
When pouring casting cavities in casting moulds having after-feeding reservoirs, tubular lances are introduced, firstly with their point at a short distance from the after-feeding reservoir, after which the lances are pressurized from a pressure chamber and by means of a member with an inclined surface pressed downwardly through the last short distance to the after-feeding reservoir so as to pressurize the latter. With this arrangement it is possible to pressurize the after-feeding reservoirs without the need of equipping the casting moulds with complicated extra equipment and without risk of the molten metal being pressurized unnecessarily.
Claims19
A method of active after-feeding castings in casting moulds with at least one after-feeding reservoir, each after-feeding reservoir communicating with at least one mould cavity, a gas pressure being applied and maintained on a molten metal in at least one after-feeding reservoir, until the metal in the at least one mould cavity has solidified, said method comprising the steps of:
- a) initially inserting at least one gas pressure-supply lance member into the mould such that a distal end of the lance member is located in the mould, and
- b) supplying a gas pressure to the distal end of the at least one pressure-supply lance member and further inserting the distal end of the at least one gas pressure-supply lance member into the after-feeding reservoir such that the gas pressure is supplied into the at least one after-feeding reservoir.
A pressure-supply system for carrying out an active after-feeding castings in moving casting moulds with at least one after-feeding reservoir, each after-feeding reservoir communicating with at least one mould cavity, a gas pressure being applied and maintained on a molten metal in at least one after-feeding reservoir, until the metal in the at least one mould cavity has solidified, said pressure supply system comprising:
- at least one pressure chamber adapted to be supplied with pressure from at least one pressure source, said pressure chamber being provided with a slot closed by elastically resilient lips pressing from each respective side of said slot into mutually sealing abutment about a parting surface, and
- a tubular lance having a rearmost end and a forwardmost end, said lance further having an apertured inlet end at the rearmost end and at least one exit aperture at the forwardmost most end, said lance being adapted to be inserted into a casting mould after forming thereof and to move along with the casting mould so as to make said at least one exit aperture communicate with the after-feeding reservoir of said casting mould, and
- wherein said slot and lips are shaped and dimensioned to receive the proximal end such that said proximal end moves in a longitudinal direction of the slot and hence in a direction of advancement of said mould, during which advancement said lips embracing said proximal end in a substantially air-tight manner at said parting surfaces.
Dependencies are inferred from the claim text.