The invention provides a neck-down feeder of unitary construction for use in metal casting. The feeder comprises a body portion integrally formed at a first end thereof with a tapered base portion for mounting on a mold pattern. The body portion and the base portion are defined by a continuous sidewall having one or more regions of weakness arranged such that the feeder is breakable in use whereby at least a part of the base portion detaches from the body portion and is received therein.

The present invention relates to a feeder system for use in metal casting operations utilising casting moulds, and to feeder sleeves and breaker cores for use in the feeder system. There is provided a feeder system for metal casting, the feeder system comprising a feeder sleeve mounted on a breaker core, the feeder sleeve having a first end and an opposite second end, a longitudinal axis extending between the first and second ends, and a continuous sidewall extending generally around the longitudinal axis between the first and second ends, the sidewall defining a cavity for receiving molten metal during casting, and the breaker core defining an open bore therethrough for connecting the cavity to the casting, wherein the first end of the feeder sleeve comprises a base portion which is mounted on the breaker core, and the second end of the feeder sleeve comprises a planar roof portion and a curved or chamfered portion extending around the periphery of the roof portion, for connecting the sidewall and the roof portion.

The present invention relates to a feeder system for use in metal casting operations utilising casting moulds, and to feeder sleeves and breaker cores for use in the feeder system. There is provided a feeder system for metal casting, the feeder system comprising a feeder sleeve mounted on a breaker core, the feeder sleeve having a first end and an opposite second end, a longitudinal axis extending between the first and second ends, and a continuous sidewall extending generally around the longitudinal axis between the first and second ends, the sidewall defining a cavity for receiving molten metal during casting, and the breaker core defining an open bore therethrough for connecting the cavity to the casting, wherein the first end of the feeder sleeve comprises a base portion which is mounted on the breaker core, and the second end of the feeder sleeve comprises a planar roof portion and a curved or chamfered portion extending around the periphery of the roof portion, for connecting the sidewall and the roof portion.

The present invention relates to a feeder system for use in metal casting operations utilising casting moulds and to a feeder sleeve for use in the feeder system. There is provided a feeder system for metal casting, the feeder system comprising a feeder sleeve mounted on a breaker core, the feeder sleeve having a first end and an opposite second end, a longitudinal axis extending between the first and second ends, and a continuous sidewall extending generally around the longitudinal axis between the first and second ends, the sidewall defining a cavity for receiving molten metal during casting, and the breaker core defining an open bore therethrough for connecting the cavity to the casting, wherein the first end of the feeder sleeve is mounted on the breaker core, and the feeder sleeve comprises at least one protrusion extending from an exterior surface of the sidewall at the second end of the feeder sleeve.

A feeder system for metal casting comprising a feeder sleeve mounted on a tubular body. The feeder sleeve has a first end and a second end and a longitudinal axis extending generally between said first and second ends. The feeder sleeve comprises a continuous sidewall that extends generally around the longitudinal axis that defines a cavity for receiving liquid metal during casting and the sidewall has a base at the first end of the feeder sleeve. The tubular body defines an open bore therethrough for connecting the cavity to the casting in use. The feeder sleeve comprises at least one cut-out that extends into the sidewall from the base to a first depth and the tubular body projects into the cut-out to a second depth, the tubular body having at least one abrading region in contact with a surface of the feeder sleeve within the cut-out. The second depth is equal to or less than the first depth so that upon application of a force in use the abrading region abrades the surface of the feeder sleeve with which it is in contact such that the tubular body is pushed towards the second end. The invention also resides in a feeder sleeve for use in the system and a process for preparing a casting mould employing the system.

A method for producing a feeder (10) that is intended for use in a casting mold used for the casting of metals and comprises a feeder body (11), which encloses an inner cavity (25) as a feeder volume, consists of an exothermic and/or insulating material, has at least one lateral wall region (12) and a bottom region (13) with a feeder opening (14) arranged therein for connecting the inner cavity (25) of the feeder body (11) to the mold cavity of the casting mold during the casting operation and has a mesh-like fabric consisting of a refractory material covering over the feeder opening (14) therein, is characterized in that, in the course of the production of the feeder in a core shooter, a piece of fabric (21) of the mesh-like fabric is positioned in a pattern device (17) forming the shape of the feeder (10) in a core box (30) of the core shooter, in such a way that the peripheral region (22) of the piece of fabric (21) positioned in the bottom region (13) of the later feeder (10) is at least partially bent up in the direction of the lateral wall region (13) of the feeder body (11) and, during the shooting of the feeder (10), the bent-up peripheral region (22) is surrounded by the material shot in and is anchored in the material of the finished shot feeder (10).

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 process employing the feeder system.

The invention relates to a feeder insert (1, 1, 1, 1, 100, 100) for use in metal casting in casting molds, comprising a feeder body (2, 2, 2, 2, 102, 102) which delimits a feeder cavity (4, 4, 4, 4, 104, 104) for receiving liquid metal, wherein the feeder body (2, 2, 2, 2, 102, 102) has a first end (6, 6, 6, 6, 106, 106) having a passage opening (8) for the liquid metal and a second end (10, 10, 10, 10, 110, 110) opposite the first end (6, 6, 6, 6, 106, 106), and wherein the feeder body (2, 2, 2, 2, 102, 102) comprises a central axis (Z) extending through the passage opening (8). The feeder body (2, 2, 2, 2, 102, 102) is separated at least one partition plane (E) extending in a direction of the central axis (Z) and is formed at least from a first feeder shell (18, 18, 18, 18, 118, 118) and a second feeder shell (20, 20, 20, 20, 120, 120). The first and second feeder shells (18, 18, 18, 18, 118, 118) are connected to each other to form the feeder body (2, 2, 2, 2, 102, 102).

A feeder system for metal casting comprising a feeder sleeve mounted on a tubular body. The feeder sleeve has a first end and a second end and a longitudinal axis extending generally between said first and second ends. The feeder sleeve comprises a continuous sidewall that extends generally around the longitudinal axis that defines a cavity for receiving liquid metal during casting and the sidewall has a base at the first end of the feeder sleeve. The tubular body defines an open bore therethrough for connecting the cavity to the casting in use. The feeder sleeve comprises at least one cut-out that extends into the sidewall from the base to a first depth and the tubular body projects into the cut-out to a second depth, the tubular body having at least one abrading region in contact with a surface of the feeder sleeve within the cut-out. The second depth is equal to or less than the first depth so that upon application of a force in use the abrading region abrades the surface of the feeder sleeve with which it is in contact such that the tubular body is pushed towards the second end. The invention also resides in a feeder sleeve for use in the system and a process for preparing a casting mould employing the system.

There is provided a refractory article for use in metal casting and a composition for manufacture thereof, comprising a particulate refractory material, an oxidisable fuel, an oxidant, a sensitizer; a binder, and from 0.5 to 5 wt % CaSO.sub.4.