Abstract: A mould for use in the casting of molten ferrous metal is described comprising a mould cavity and a runner system comprising a sprue, a sprue well and a runner, and having located in the runner a ceramic filter having an open-cell foam structure. A sealed plastics container containing particles of a treatment agent, such as an inoculant for the molten ferrous metal is located in a chamber in the runner system on that side of the filter which is further from the mould cavity such that part of the container is in the sprue well.

Abstract: A method for moulding multiple castings in which each mould is fed from a source of molten metal through a thin slit the width of which lies in the range 1.25 mm down to 0.25 mm. The cast articles can easily be removed from the runner and riser system after casting without a machining operation so that the casting moulds can be packed closer together and more castings can be produced from each mould assembly. The thin slit also acts as a filter. A particular mould assembly seen in FIG. 2 is cylindrical and comprises a plurality of wedge-shaped mould segments 2 having mould cavities 4 in abutting faces. A central runner passage 6 is formed when the mould segments are assembled and the metal flows into the mould cavities through narrow slits 10 in one edge of each mould. After casting and removal of the mould the narrow flashing formed in the slits can easily be broken to remove the cast articles from the metal formed in the central runner passage.

Abstract: A molten metals filter apparatus having a hollow frusto-conical strainer, including an inlet port and a plurality of slot apertures having a uniform width for selectively restraining particulant impurities in molten metals.

Abstract: In a mould assembly for multiple castings each mould is fed from a source of molten metal through a thin slit the width of which lies in the range 1.25 mm to 0.25 mm. The cast articles can be easily removed from the runner and riser system after casting without a machining operation so that the casting moulds can be packed closer together and more castings can be produced from each mould assembly. The thin slit also acts as a filter. A particular mould assembly seen in FIG. 2 is cylindrical and comprises a plurality of wedge-shaped mould segments 2 having mould cavities 4 in abutting faces. A central runner passage 6 is formed when the mould segments are assembled and the metal flows into the mould cavities through narrow slits 10 in one edge of each mould. After casting and removal of the mould the narrow flashing formed in the slits can be easily broken to remove the cast articles from the metal formed in the central runner passage.

Abstract: A method and a mould for making a cast single crystal in which the casting mould comprises a main casting chamber and a seed crystal mounted at or adjacent the entry aperture to this chamber. The charge of molten metal is arranged to flow over the crystal to produce melting of its upper surface. The molten metal filling the mould is then arranged to solidify progressively from the seed crystal, which then imposes its own structure and orientation on the solidifying metal.

Abstract: A gating system of general application for pouring foundry molds by gravity, based on a distinct prefabricated casting skin-strainer, located along and following the casting surface, structurally constructed and mold supported to withstand the impact of falling molten metal and the consequent metalistatic pressure, all while the cavity is filled through a skin-strainer aperture and with the skin-strainer retaining its original position and shape. The skin-strainer is able, when necessary, to allow the feeding of the casting once the mold is full and before it is solidified. Depending on the casting to be poured the system may include an overhead melt distributor, and techniques for mold casting cavity venting and sprue-feeder extraction.

Abstract: A system for the casting of metal comprising a filter through which the metal passes during pouring into a mold cavity. The filter is formed by providing a multiplicity of substantially spherical refractory particles. A ceramic binder is employed for securing the particles in a bonded assembly, the binder substantially completely coating the particles. Openings are defined between the adjoining coated particles to permit the flow of molten metal through the filter. The binder is of a type having an affinity for dross and slag constituents in the molten metal whereby the constituents are removed during passage of the metal through the filter. The refractory particles are preferably bonded into an assembly by processing which includes coating the particles with the binder material, introducing the coated particles into a mold and drying and firing the coated particles in the mold to achieve the desired bonded relationship.