The present invention relates to a feeder system for metal casting. The feeder system comprises a feeder sleeve mounted on a tubular body. The feeder sleeve has a longitudinal axis and comprises a continuous sidewall that defines a cavity for receiving liquid metal during casting. The sidewall extends generally around the longitudinal axis and has a base adjacent the tubular body. The tubular body defines an open bore therethrough for connecting the cavity to the casting. A groove extends into the sidewall from the base to a first depth and the tubular body projects into the groove to a second depth and is held in position by retaining means. The second depth being less than the first depth so that upon application of a force in use the retaining means are overcome and the tubular body is pushed further into the groove.

A feeder system for metal casting comprising a feeder sleeve mounted on a tubular body. The tubular body has a first end and an opposite second end and a compressible portion therebetween so that upon application of a force in use, the distance between the first and second ends is reduced. The feeder sleeve has a longitudinal axis and comprises a continuous sidewall extending generally around the longitudinal axis that defines a cavity for receiving liquid metal during casting, the sidewall having a base adjacent the second end of the tubular body. The tubular body defines an open bore therethrough for connecting the cavity to the casting. The feeder sleeve has at least one cut-out that extends into the sidewall from the base and the second end of the tubular body projects into the cut-out to a fixed depth. The cut-out can be a groove which is separate from the cavity. The invention also resides in a feeder sleeve for use in the system and a process employing the feeder system.

A method for manufacturing a shell mold for the production by lost-wax casting of bladed elements (1) of an aircraft turbine engine, including the following steps: creating an assembly (200) including a wax pattern (100) as well as a device for forming a cup for pouring metal (32b) and having an end surface (40a); depositing a hot wax coating layer on at least one portion of the end surface (40a); forming the shell mold around the assembly (200). In addition, the method includes, between steps b) and c), the implementation of a step of structuring the coating layer intended for reinforcing the adhesion between the layer (46) and the shell mold, and including the production of recesses (62) and projections (60) on the still-malleable coating layer.

A lip for an earth moving machine shovel, comprising: a main body (1a, 1b), and a plurality of noses (3) protruding from the main body (1a, 1b); the at least one transmission surface (4a, 4b) between each nose (3) and the main body (1b) has a 5 slope variation of between 0 and 10, each transmission surface (4a, 4b) comprising at least a portion of a stabilisation surface (9a, 9b) of the respective nose (3) and a portion of a surface of the main body (1b). Also, a method for manufacturing a lip comprising: introducing molten steel into a lip mould through one or more openings in the mould, the mould comprising a plurality of risers; cooling or 0 waiting for the molten steel introduced into the mould until it solidifies; and removing the plurality of risers from the lip manufactured with the mould.

A method of improving riser feedability in semi-permanent mold casting is disclosed. The method includes providing a first receptacle fluidly connected to a mold cavity and providing a second receptacle fluidly connected to a riser. Further, the method includes delivering molten metal to the first receptacle and conveying the molten metal into the mold cavity through a sprue. Delivery of molten metal to the first receptacle is terminated when the mold cavity reaches a predetermined fill level delivery of molten metal to the second receptacle is initiated. In certain embodiments, the first receptacle and the second receptacle are combined into a single receptacle and the sprue is connected to the mold cavity through a lower runner and is connected to the riser through an upper runner.

The riser base is an insert obtained by manual moulding or by blowing having an insulating or exothermal composition. The composition includes hollow microspheres of aluminium silicate. The mould is mainly comprised of silica sand and presents a main cavity configured to be filled with molten metal to obtain a cast part and one or several auxiliary cavities. The insert fits into the auxiliary cavity made in the mould and presents an interior cavity configured to receive molten metal from a feeding riser or mini-feeding riser and an exterior geometry which coincides with the geometry of the aforesaid auxiliary cavity. The auxiliary cavity or cavities made in the mould itself are disposed in such a way that when the riser base is inserted into the auxiliary cavity, the interior cavity of the riser base is left in communication with the main cavity of the mould to allow passage of the molten metal.

A breaker core for use in a casting process includes a disk-shaped breaker core (10) having breaker core body and a through-opening (11) for liquid metal. A ring-shaped frame (12) made from a heat-resistant material is secured to the breaker core (10) and has a netlike webbing (15) tensioned therein. The netlike webbing (15) is made from a fire-proof material and spans the through-opening (11) of the breaker core (10) on an underside of a feeder. The frame (17) is secured with an outer sidewall (17) to the body of the disk-shaped breaker core (10). A plane of the netlike webbing (15) tensioned in the frame (12) is secured with a stepped offset to an upper end of the sidewall (17) facing the feeder, so that the netlike webbing (15) is placed in an area of an underside of the breaker core (10) facing the casting model.

A feeder (10) for use in a casting mold includes a feeder body (11) made from an exothermic and/or insulating material. The feeder body has a bottom surface (15) with a feeder opening (16) for connection of the inner cavity (12) of the feeder body (1) with the mold cavity of the casting mold during a casting process. A ring-shaped frame (17) made of a heat-resistant material is secured to the feeder body (11). A netlike webbing (18) made from a fire-resistant material is tensioned within the ring-shaped frame (17). The frame (17) is arranged on the surface (15) of the feeder body (11), such that the netlike webbing (18) is positioned with the feeder (10) formed in the casting mold directly on a surface of a casting piece to be formed during casting.

A sleeve (110) for use in metal casting has a sleeve body, where a longitudinal axis (B) has a side wall (116) formed around it, defining a sleeve interior. The sleeve body is open at a first end (118). A core (120) is formed integrally along an interior surface extends into the sleeve interior. The sleeve body and the core are formed of a gas-permeable refractory material. At least the core contains material for generating heat when heated by a molten metal. The core extends along the side wall from the first end to a second end. The core has a width that is constant or decreases in a radial direction away from the side wall, especially with a triangular profile, with a base thereof in contact with the side wall. The sleeve body is cylindrical or frustoconical, with a diameter that decreases from the open first end.

The invention relates to a method for producing a feeder configured for use in a casting mold used for casting metals, wherein the feeder has a feeder body (14) enclosing a feeder cavity (15) and a through opening (19) in its base region (18) for connecting the feeder cavity (15) to the casting mold and the feeder body (14) consists of an exothermic material and is enclosed on its outer side at least in regions by an external shell (27) consisting of insulating refractory material, and wherein the feeder is provided with a feeder foot (20) arranged externally in its base region (18) and having an opening (21) flush with the through opening (19). The feeder is characterized in that the feeder body (14) produced in a first step in a conventional method from an exothermic material is used together with the feeder foot (20) associated with the base region (18) to form the external shell (27) into an injection mold (10) having a mold cavity (30) and feeder body and feeder foot are shot simultaneously with the insulating material, wherein the feeder body (14) including the feeder foot (20) is positioned in such a manner that the insulating material shot into the mold cavity (30) of the injection mold (10) fills in a gap (25) left between the feeder foot (20) and the base of the mold cavity (30) at least one part of the circumference of the feeder foot (20) and extending over at least a part of the height of the feeder foot (20), and the shot external shell (27) thereby extends at least partially under the feeder foot (20) with the exception of its opening (21) and is attached to the base region (18) of the feeder body (14) without the use of auxiliary means.