US20090014482A1 - Feeder Element for Metal Casting - Google Patents

Feeder Element for Metal Casting Download PDF

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Publication number
US20090014482A1
US20090014482A1 US11/883,419 US88341907A US2009014482A1 US 20090014482 A1 US20090014482 A1 US 20090014482A1 US 88341907 A US88341907 A US 88341907A US 2009014482 A1 US2009014482 A1 US 2009014482A1
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Prior art keywords
feeder
feeder element
sidewall
sleeve
sidewall region
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US11/883,419
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English (en)
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Trevor Leonard Tackaberry
Philip Robert Dahlstrom
Anthony Cosmo Midea
Colin Powell
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Foseco International Ltd
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Foseco International Ltd
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Assigned to FOSECO INTERNATIONAL LIMITED reassignment FOSECO INTERNATIONAL LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: POWELL, COLIN, DAHLSTROM, PHILIP ROBERT, MIDEA, ANTHONY COSMO, TACKABERRY, TREVOR LEONARD
Publication of US20090014482A1 publication Critical patent/US20090014482A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C19/00—Components or accessories for moulding machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/084—Breaker cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/088—Feeder heads

Definitions

  • the present invention relates to an improved feeder element for use in metal casting operations utilising casting moulds, especially but not exclusively in medium-pressure sand moulding systems.
  • molten metal is poured into a pre-formed mould cavity which defines the shape of the casting.
  • the metal solidifies it shrinks, resulting in shrinkage cavities which in tmm result in unacceptable imperfections in the final casting.
  • This is a well known problem in the casting industry and is addressed by the use of feeder sleeves or risers which are integrated into the mould during mould formation.
  • Each feeder sleeve provides an additional (usually enclosed) volume or cavity which is in communication with the mould cavity, so that molten metal also enters into the feeder sleeve.
  • molten metal within the feeder sleeve flows back into the mould cavity to compensate for the shrinkage of the casting.
  • feeder sleeves are made to be highly insulating or more usually exothermic, so that upon contact with the molten metal additional heat is generated to delay solidification.
  • the feeder sleeve cavity may be tapered towards its base (i.e. the end of the feeder sleeve which will be closest to the mould cavity) in a design commonly referred to as a neck down sleeve.
  • a sharp blow is applied to the residual metal it separates at the weakest point which will be near to the mould (the process commonly known as “knock off”).
  • a small footprint on the casting is also desirable to allow the positioning of feeder sleeves in areas of the casting where access may be restricted by adjacent features.
  • feeder sleeves may be applied directly onto the surface of the mould cavity, they are often used in conjunction with a breaker core.
  • a breaker core is simply a disc of refractory material (typically a resin bonded sand core or a ceramic core or a core of feeder sleeve material) with a hole in its centre which sits between the mould cavity and the feeder sleeve.
  • the diameter of the hole through the breaker core is designed to be smaller than the diameter of the interior cavity of the feeder sleeve (which need not necessarily be tapered) so that knock off occurs at the breaker core close to the mould.
  • Breaker cores may also be manufactured out of metal.
  • DE 196 42 838 A1 discloses a modified feeding system in which the traditional ceramic breaker core is replaced by a rigid flat annulus and
  • DE 201 12 425 U1 discloses a modified feeding system utilising a rigid “hat-shaped” annulus.
  • Casting moulds are commonly formed using a moulding pattern which defines the mould cavity. Pins are provided on the pattern plate at predetermined locations as mounting points for the feeder sleeves. Once the required sleeves are mounted on the pattern plate, the mould is formed by pouring moulding sand onto the pattern plate and around the feeder sleeves until the feeder sleeves are covered and the mould box is filled.
  • the mould must have sufficient strength to resist erosion during the pouring of molten metal, to withstand the ferrostatic pressure exerted on the mould when full and to resist the expansion/compression forces when the metal solidifies.
  • Moulding sand can be classified into two main categories. Chemical bonded (based on either organic or inorganic binders) or clay-bonded. Chemically bonded moulding binders are typically self-hardening systems where a binder and a chemical hardener are mixed with the sand and the binder and hardener start to react immediately, but sufficiently slowly enough to allow the sand to be shaped around the pattern plate and then allowed to harden enough for removal and casting.
  • Clay-bonded moulding uses clay and water as the binder and can be used in the “green” or undried state and is commonly referred to as greensand. Greensand mixtures do not flow readily or move easily under compression forces alone and therefore to compact the greensand around the pattern and give the mould sufficient strength properties as detailed previously, a variety of combinations of jolting, vibrating, squeezing and ramming are applied to produce uniform strength moulds at high productivity.
  • the sand is typically compressed (compacted) at high pressure, usually using a hydraulic ram (the process being referred to as “ramming up”).
  • the above problem is partly alleviated by the use of spring pins.
  • the feeder sleeve and optional locator core (similar in composition and overall dimensions to breaker cores) is initially spaced from the pattern plate and moves towards the pattern plate on ram up.
  • the spring pin and feeder sleeve may be designed such that after ramming, the final position of the sleeve is such that it is not in direct contact with the pattern plate and may be typically 5 to 25 mm distant from the pattern surface.
  • the knock off point is often unpredictable because it is dependent upon the dimensions and profile of the base of the spring pins and therefore results in additional cleaning costs.
  • the solution offered in EP-A-1184104 is a two-part feeder sleeve.
  • WO2005/051568 discloses a feeder element (a collapsible breaker core) that is especially useful in high-pressure sand moulding systems.
  • the feeder element has a first end for mounting on a mould pattern, an opposite second end for receiving a feeder sleeve and a bore between the first and second ends defined by a stepped sidewall.
  • the stepped sidewall is designed to deform irreversibly under a predetermined load (corresponding to the crush strength).
  • the feeder element offers numerous advantages over traditional breaker cores including:—
  • the feeder element of WO2005/051568 is exemplified in a high-pressure sand moulding system.
  • the high ramming pressures involved necessitate the use of high strength (and high cost) feeder sleeves.
  • This high strength is achieved by a combination of the design of the feeder sleeve (i.e. shape, thickness etc.) and the material (i.e. refractory materials, binder type and addition, manufacturing process etc.).
  • the examples demonstrate the use of the feeder element with a FEEDEX HD-VS159 feeder sleeve, which is designed to be pressure resistant (i.e. high strength) and for spot feeding (high density, highly exothermic, thick walled, not high volume feed demand).
  • the feeder sleeve is secured to the feeder element via a mounting surface which bears the weight of the feeder sleeve and which is perpendicular to the bore axis.
  • a mounting surface which bears the weight of the feeder sleeve and which is perpendicular to the bore axis.
  • feeder element of WO20051051568 were to be employed in medium-pressure moulding lines it would be necessary to design the element so that it collapses sufficiently at the lower moulding pressure (as compared to high pressure moulding) i.e. to have a lower initial crush strength. It would also be highly advantageous to use lower strength feeder sleeves (typically lower density sleeves), which would allow for a greater range of sleeve designs and compositions to be used successfully and optimally for a greater range of casting types and correspondingly lower cost feeder sleeves. However, when this was attempted the inventors surprisingly discovered that the feeder sleeve suffered damage and breakages on moulding which if used for casting would have resulted in the casting suffering from defects.
  • a feeder element for use in metal casting comprising:
  • a first end for mounting on a mould pattern (i) an opposite second end for receiving a feeder sleeve; and (iii) a bore between the first and second ends defined by a stepped sidewall; said feeder element being compressible in use whereby to reduce the distance between the first and second ends, wherein the stepped sidewall has a first sidewall region defining the second end of the element and a mounting surface for a feeder sleeve in use, said first sidewall region being inclined to the bore axis by less than 90° and a second sidewall region contiguous with the first sidewall region, said second sidewall region being parallel to or inclined to the bore axis at a different angle to the first sidewall region whereby to define a step in the sidewall.
  • the feeder element may comprise additional sidewall regions, whereby multiple steps in the sidewall are defined, in which case at least one of the additional sidewall regions is preferably inclined at a greater angle to the axis than the first sidewall region.
  • orientation of the sidewall region defining the mounting surface for the feeder sleeve and bearing the weight of the feeder sleeve is not particularly limited, it is said to be preferably perpendicular to the bore axis as is shown in all of the examples. The only significance placed on the orientation of this surface is that the perpendicular arrangement is the most convenient for mounting the sleeve.
  • the first sidewall region is inclined to the bore axis at an angle of between 50 and 85°, more preferably at an angle of between 15° and 80°, even more preferably at an angle of between 25° and 75°, and most preferably at an angle of between 30° and 70°.
  • the first sidewall region may be inclined to the bore axis at an angle of 60°.
  • the amount of compression and the force required to induce compression will be influenced by a number of factors including the material of manufacture of the feeder element and the shape and thickness of the sidewall. It will be equally understood that individual feeder elements will be designed according to the intended application, the anticipated pressures involved and the feeder size requirements.
  • the initial crush strength (i.e. the force required to initiate compression and irreversibly deform the feeder element over and above the natural flexibility that it has in its unused and uncrushed state) is no more than 5000 N, and more preferably no more than 3000 N. If the initial crush strength is too high, then moulding pressure may cause the feeder sleeve to fail before compression is initiated. Preferably, the initial crush strength is at least 250 N. If the crush strength is too low, then compression of the element may be initiated accidentally, for example if a plurality of elements is stacked for storage or during transport.
  • the feeder element of the present invention may be regarded as a collapsible breaker core as this term suitably describes some of the functions of the element in use.
  • breaker cores comprise resin bonded sand or are a ceramic material or a core of feeder sleeve material.
  • the feeder element of the current invention can be manufactured from a variety of other suitable materials including metal. In certain configurations it may be more appropriate to consider the feeder element to be a feeder neck.
  • the term “compressible” is used in its broadest sense and is intended only to convey that the length of the feeder element between its first and second ends is shorter after compression than before compression.
  • said compression is non-reversible i.e. after removal of the compression inducing force the feeder element does not revert to its original shape.
  • the stepped sidewall of the feeder element comprises a first series of sidewall regions (said series having at least one member) in the form of rings (which are not necessarily planar) of increasing diameter (when said series has more than one member) interconnected and integrally formed with a second series of sidewall regions (said second series having at least one member).
  • the sidewall regions are of substantially uniform thickness, so that the diameter of the bore of the feeder element increases from the first end to the second end of the feeder element.
  • the second series of sidewall regions are cylindrical (i.e. parallel to the bore axis), although they may be frustoconical (i.e. inclined to the bore axis). Both series of sidewall regions may be of non-circular shape (e.g. oval, square, rectangular, or star shaped).
  • the second sidewall region constitutes the sidewall region of the second series closest to the second end of the feeder element.
  • the compression behaviour of the feeder element can be altered by adjusting the dimensions of each sidewall region.
  • all of the first series of sidewall regions have the same length and all of the second series of sidewall regions have the same length (which may be the same as or different from the first series of sidewall regions and which may be the same as or different from the first sidewall region).
  • the length of the first series of sidewall regions and/or the second series of sidewall regions incrementally increases towards the first end of the feeder element.
  • the feeder element may be defined by the first sidewall region and one each of the first and second series of sidewall regions. However, the feeder element may have as many as six or more of each of the first and the second series of sidewall regions. In a particularly preferred embodiment, four of the first series and five of the second series are provided.
  • the thickness of the sidewall regions is from about 4 to 24%, preferably from about 6 to 20%, more preferably from about 8 to 16% of the distance between the inner and outer diameters of the first sidewall regions (i.e. the annular thickness in the case of planar rings (annuli)).
  • the distance between the inner and outer diameters of the first series of sidewall regions is 4 to 10 ml and most preferably 5 to 7.5 mm.
  • the thickness of the sidewall regions is 0.2 to 1.5 mm and most preferably 0.3 to 1.2 mm.
  • the ideal thickness of the sidewall regions will vary from element to element and be influenced by the size, shape and material of the feeder element, and by the process used for its manufacture.
  • the first end (base) of the feeder element being defined by a sidewall region of the first or second series which is non-perpendicular to the bore axis.
  • the sidewall region which defines the first end of the feeder element may have a different length and/or orientation to the other sidewall regions of that series.
  • the sidewall region defining the base may be inclined to the bore axis at an angle of 5 to 30°, preferably 5 to 15°.
  • the free edge of the sidewall region defining the first end of the feeder element has an inwardly directed annular flange or bead.
  • the feeder element is intended to be used in conjunction with a feeder sleeve.
  • the invention provides in a second aspect a feeder system for metal casting comprising a feeder element in accordance with the first aspect and a feeder sleeve secured thereto.
  • a standard feeder sleeve has an annular base for mounting onto a breaker core (collapsible or otherwise).
  • the base of the feeder sleeve is profiled at the same angle as the first sidewall region of the feeder element.
  • the nature of the feeder sleeve is not particularly limited and it may be for example insulating, exothermic or a combination of both. Neither is its mode of manufacture particularly limited, it may be manufactured for example using either the slurry or core-shot method.
  • a feeder sleeve is made from a mixture of refractory fillers (e.g. fibres, hollow microspheres and/or particulate materials) and binders.
  • An exothermic sleeve further requires a fuel (usually aluminium or aluminium alloy) and usually initiators/sensitisers.
  • Suitable feeder sleeves include for example those sold by Foseco under the trade name KALMIN, KALMINEX or FEEDEX.
  • Feeder sleeves are available in a number of shapes including closed and open cylinders, ovals, neckdowns and domes.
  • the feeder element is used in conjunction with any conventional insert sleeve design which consists of a closed (capped) sleeve that may be flat topped, domed, flat topped dome, or any other insert sleeve design.
  • the feeder sleeve may be conveniently secured to the feeder element by adhesive but may also be push fit or have the sleeve moulded around part of the feeder element.
  • the feeder sleeve is adhered to the feeder element.
  • the invention allows the use of lower strength sleeves to be used down to a value of 3.5 kN.
  • the sleeve strength is at least 5 kN.
  • the sleeve strength is less than 20 kN.
  • the strength of a feeder sleeve is defined as the compressive strength of a 50 ⁇ 50 mm cylindrical test body made from the feeder sleeve material.
  • a 201/70 EM compressive testing machine (Form & Test Seidner, Germany) is used and operated in accordance with the manufacturer's instructions. The test body is placed centrally on the lower of the steel plates and loaded to destruction as the lower plate is moved towards the upper plate at a rate of 20 mm/minute.
  • the effective strength of the feeder sleeve will not only be dependent upon the exact composition, binder used and manufacturing method, but also on the size and design of the sleeve, which is illustrated by the fact that the strength of a test body is usually higher than that measured for a standard flat topped 6/9K sleeve.
  • the potential availability of a greater range of sleeve compositions and designs that can be used together with the invention enables the most appropriate (technically and economically) sleeve to be specified for each individual casting, which is not possible with the existing prior art.
  • FIG. 1 is a cross section of a test piece containing features of the feeder element in accordance with invention.
  • FIGS. 2 a and 2 b are a cross section and a top view respectively of a known feeder element.
  • FIG. 3 a is a known VSK feeder sleeve design.
  • FIG. 3 b is a known 6/9K feeder sleeve design.
  • FIG. 3 c is a flat topped dome feeder sleeve design.
  • FIG. 4 is a cross section of another known feeder element.
  • FIGS. 5 a to 5 c are computer simulations of the known feeder element of FIG. 4 in use.
  • FIG. 6 is a cross section of a feeder element in accordance with the invention.
  • FIGS. 7 a and 7 b are computer simulations of the feeder element of FIG. 6 in use.
  • FIG. 8 is a cross section of another feeder element in accordance with the invention.
  • FIG. 9 is a flat topped dome feeder sleeve with modified base together with a feeder element in accordance with the invention.
  • FIG. 10 a is a plot of force applied against displacement for a KALMINEX 2000ZP 6/9K feeder sleeve under compression
  • FIGS. 10 b to 10 i are plots of force applied against displacement for the test pieces of FIG. 1 together with a KALMINEX 2000ZP 6/9K feeder sleeve with varying angle ⁇ .
  • a 576 ⁇ 432 mm ram plate was positioned 144 mm above the height of the flask (approximately 94 mm above the surface of the non-compressed sand) and the mould compressed by downward movement of the ram plate to the prescribed pressure, taking between 3 and 6 seconds to compact the sand to the level of the moulding flask. The mould was then excavated and the condition of the feeder elements and feeder sleeves was observed.
  • Feeder element test pieces and feeder sleeves were tested by sitting them between the two parallel plates of a Hounsfield compression strength tester.
  • the bottom plate was fixed, whereas the top plate traversed downwards via a mechanical screw thread mechanism at a constant rate of 30 mm per minute and graphs of force applied against plate displacement were plotted.
  • the feeder element test piece 10 consists of a circular base 12 (of diameter D) with a cylindrical sidewall region 14 (of height h) extending upwardly therefrom. Contiguous with the cylindrical sidewall region 14 is an outwardly tapering sidewall region 16 (with a maximum diameter d) which is inclined toward the cylindrical sidewall region 14 by an angle ⁇ .
  • the tapering sidewall region 16 serves as a mounting surface for a feeder sleeve in use. It will be noted that these test pieces used for compression testing are not provided with an opening in the base since they will not be used for casting.
  • the test pieces were manufactured from mild steel with a thickness of 0.5 mm.
  • D was 53.5 mm
  • h was 7.5 mm
  • d was 80.0 mm.
  • the test pieces were designed such that the height (h) of the cylindrical sidewall region 14 , the maximum diameter (d) of the outwardly tapering sidewall region 16 and the area of the mounting surface provided by the first sidewall region 16 remained constant whilst a was varied (i.e. as a decreases, the diameter (D) of the circular base 12 increases).
  • the feeder elements were tested with a KALMINEX 2000ZP 6/9K exothermic feeder sleeve as supplied by Foseco having a density of 0.55-0.65 g/cm 2 and a compression strength of the order 4 kN.
  • a feeder element (a metal collapsible breaker core sold under the nomenclature MH/33 as described in WO2005/051568 and shown in FIGS. 2 a and 2 b ) was tested in combination with the following feeder sleeves listed in Table 1:
  • the sleeve formulations vary according to the required product properties, however, all have the general formulation: 20-25% aluminium fuel; 10-20% oxidants and sensitisers; 5-10% organic binders; and 35-55% refractory fillers.
  • the type of refractory fillers used has the most direct influence on both density and strength of the sleeves.
  • the feeder element 20 comprises a first end (base) 22 for mounting on a mould pattern; an opposite second end (top) 24 for receiving a feeder sleeve; and a bore 26 between the first and second ends 22 , 24 defined by a stepped sidewall 28 .
  • the second end 24 of the feeder element 20 is defined by a first sidewall region 25 , said first sidewall region 25 being perpendicular to the bore axis A.
  • a second sidewall region 30 is contiguous with the first sidewall region 25 and parallel to the bore axis A.
  • the stepped sidewall 28 additionally comprises an alternating series of first 28 a and second 28 b sidewall regions of approximately equal length.
  • the second sidewall region 30 constitutes the first sidewall region of the second series 28 b closest to the second end 24 of the feeder element 20 .
  • the first series of sidewall regions 28 a consists of three sidewall regions that are perpendicular to the bore axis A.
  • the second series of sidewall regions 28 b consists of four sidewall regions.
  • the first three sidewall regions of the second series 28 b are parallel to the bore axis A.
  • the fourth sidewall region 32 is inclined to the bore axis A at an angle of 15° and has an inwardly directed annular flange in order to minimise its footprint and thus improve knock off.
  • the fourth sidewall region 32 is also approximately twice the length of the other sidewalls of the second series 28 b.
  • the feeder elements and feeder sleeves were moulded as described above using a moulding pressure of 380 PSI (2620 kN).
  • the feeder elements collapsed as expected and there was no visible damage to the FEEDEX HD VSK feeder sleeve, however, there was cracking and some breakages at the base of the KALMINEX 95 6/9K sleeve and KALMINEX 2000XP dome sleeve as well as some slumping (compression of the sleeve).
  • the KALMINEX 2000XP 6/9K sleeve showed severe damage and the sleeve base was broken into several pieces.
  • a KALMINEX 2000ZP feeder sleeve was not tested with the feeder element 20 because it is weaker than the KALMINEX XP and KALMINEX 95 feeder sleeves which suffered from damage at 380 PSI (2620 kN).
  • a computer simulation (ABAQUS, manufactured by Abaqus Inc.) was conducted to evaluate the stresses imposed on a feeder system comprising a standard feeder sleeve with similar dimensions to a FEEDEX HD VSK sleeve and the feeder element 40 of FIG. 4 .
  • the advanced finite element analysis software includes a static and dynamic stress-strain resolver which was used for the simulations.
  • the simulation was conducted by fixing the feeder element in the z-axis and then putting the model under a level of strain such that it compresses in the z-axis by a certain distance in a certain time. This puts various parts of the model under different stresses.
  • the model was programmed with the mechanical properties of the sleeve and the feeder element, such that the stresses within the feeder sleeve can be simulated and the metal feeder element compresses.
  • the feeder element 40 comprises a first end (base) 42 for mounting on a mould pattern; an opposite second end (top) 43 for receiving a feeder sleeve; and a bore 44 between the first and second ends 42 , 43 defined by a stepped sidewall 45 .
  • the second end 43 is defined by a first sidewall region 46 , said first sidewall region 46 being perpendicular to the bore axis A.
  • a second sidewall region 47 is contiguous with the first sidewall region 46 and parallel to the bore axis A.
  • the stepped sidewall 45 additionally comprises an alternating series of first 45 a and second 45 b sidewall regions.
  • the second sidewall region 47 constitutes the first sidewall region of the second series 45 b .
  • the first series of sidewall regions 45 a consists of two sidewall regions that are perpendicular to the bore axis A.
  • the second series of sidewall regions 45 b consists of three sidewall regions that are parallel to the bore axis A.
  • FIG. 5 a shows part of the a feeder sleeve 50 mounted on the feeder element 40 of FIG. 4 before moulding.
  • FIG. 5 b is an enlarged view of the base of the feeder element 50 mounted on feeder element 40 . . .
  • FIG. 5 c shows an enlarged view of the same feeder sleeve 50 and feeder element 40 during moulding.
  • the feeder sleeve cavity is indicated by arrow A.
  • the shading represents the magnitude of the force imposed on the feeder sleeve 50 .
  • FIG. 5 c it can be seen that the feeder element 40 deforms under pressure as expected. Surprisingly, its mounting surface 46 is forced incrementally downward at its peripheral edge. This leads to an uneven distribution of forces with a concentration on the inner wall of the feeder sleeve 50 (point loading) as indicated by arrow B.
  • the computer simulation of comparative example 2 suggests that the cracking observed in comparative example 1 may be caused by point loading on the inner wall of the feeder sleeve.
  • the inventors attempted to alleviate this by changing the shape of the feeder element.
  • the simulation was run again using the feeder element 52 of FIG. 6 in place of the feeder element 40 of FIG. 4 .
  • the inventive feeder element 52 is the same in all respects to that shown in FIG. 4 except that the mounting surface 54 of the feeder element 52 is inclined relative to the bore axis A at an angle of 60°.
  • the base of the feeder sleeve 56 ( FIG. 7 a ) was profiled to the same angle.
  • FIGS. 7 a and 7 b show the feeder element 52 and the base of the corresponding feeder sleeve 56 before and during moulding respectively.
  • FIG. 7 b shows that the force is no longer concentrated on the inner wall of the feeder sleeve 56 during moulding. It is more evenly distributed along the base of the feeder sleeve 56 so that no part of the base suffers from an excessive force.
  • the area of maximum force (arrow B) is in a region of the sleeve remote from the feeder sleeve cavity (arrow A). Failure in this region will not cause fragments of feeder sleeve material to enter the casting and thereby cause defects.
  • a feeder element 60 as shown in FIG. 8 was tested in combination with the flat topped dome shaped feeder sleeves listed in Table 2 below (as shown in FIG. 9 ):
  • the sleeve formulations vary according to the required product properties, however, all have the general formulation: 20-25% aluminium fuel; 10-20% oxidants and sensitisers; 5-10% organic binders; and 35-55% refractory fillers.
  • the type of refractory fillers used has the most direct influence on both density and strength of the sleeves.
  • the feeder element 60 is identical to the feeder element 20 shown in FIGS. 2 a and 2 b except that the first sidewall region 62 is inclined to the bore axis at an angle of 60°.
  • the feeder element was manufactured from mild steel and has a thickness of 0.5 mm.
  • the maximum diameter d is 92.9 mm and the height h is 35.4 mm.
  • the diameter of the bore 26 at the base of the feeder element is 22.9 mm.
  • the feeder element 60 and feeder sleeve combinations were moulded as described above at various pressures between 420 PSI (2896 kPa) and 700 PSI (4826 kPa). The results are summarised in Table 3 below.
  • the flat topped dome shaped KALMINEX 2000XP feeder sleeve was employed with a conventional feeder element 20 in Comparative, Example 1 where it failed at much lower pressures. At just 380 PSI (2620 kPa), the feeder sleeve slumped and cracked along its base and at 620 PSI (4275 kPa) it suffered severe damage.
  • the KALMINEX 95 6/9K feeder sleeve was employed with a conventional feeder element 20 in Comparative Example 1 with very different results.
  • the feeder sleeve suffered from cracking along its base at just 380 PSI (2620 kPa). At 620 PSI (4275 kPa) it suffered from more extensive cracking along its base and significant slumping. Cracking along the base is particularly problematic because chips of feeder sleeve may enter the casting.
  • feeder element 60 of the present invention provides advantages over conventional feeder elements such as feeder element 20 shown in Comparative Example 1.
  • feeder element 52 When used in combination with feeder element 52 the medium strength feeder sleeves KALMINEX 2000XP and KALMINEX 95 are successful to much higher pressures. Further, when the feeder sleeves do eventually fail their mode of failure is less likely to lead to casting defects.
  • FIG. 10 a force is plotted against plate displacement for a KALMINEX 2000ZP 6/9K feeder sleeve (as shown in FIG. 3 b ) without a feeder element test piece.
  • a critical force is applied (point Z), referred to herein as the sleeve crush strength (approximately 4.5 kN) after which point the compression of the sleeve proceeds steadily under a reducing loading.
  • point A a critical force is applied
  • point B marking the minimum force measurement after the initial feeder element test piece crush strength occurs. Further compression occurs and the force increases to a maximum (maximum feeder element crush strength, point C).
  • This is due to the initial feeder element test piece crush strength being lower but also, more significantly, it is due to damage of the feeder sleeve at the base due to the applied force from the feeder element test piece (damaging) breaking the feeder sleeve such that the feeder element is pushed up into the feeder sleeve and causes the measured displacement.
  • the initial feeder element test piece crush strength point A
  • the previously measured feeder sleeve crush strength Z, approximately 4.5 kN
  • the ideal initial crush strength of the feeder element will be dependent upon the feeder sleeve (compression strength) and the moulding pressures employed.
  • the initial feeder element crush strength should clearly be lower than the sleeve crush (compression) strength and ideally, the initial crush strength should be lower than 3000 N. If the initial crush strength is too high then moulding pressure may cause failure of the feeder sleeve before the feeder element has a chance to compress.
  • the ideal maximum crush strength is very much dependent on the application for which the feeder element core is intended i.e. the moulding pressure employed and the sleeve composition (strength). If the maximum crush strength were too high for the moulding pressures employed, then there would be insufficient collapsing of the feeder element and subsequently insufficient sand compaction. In addition, it would limit the type (strength) of sleeves that could be successfully employed.

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  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
US11/883,419 2006-06-09 2007-04-30 Feeder Element for Metal Casting Abandoned US20090014482A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0611430.0 2006-06-09
GBGB0611430.0A GB0611430D0 (en) 2006-06-09 2006-06-09 Improved feeder element for metal casting
PCT/GB2007/001572 WO2007141466A1 (fr) 2006-06-09 2007-04-30 Élément de masselotte pour fonderie de métaux

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US (1) US20090014482A1 (fr)
EP (1) EP1879710B1 (fr)
JP (1) JP5068312B2 (fr)
KR (1) KR101361436B1 (fr)
CN (1) CN101466488A (fr)
AT (1) ATE424950T1 (fr)
AU (1) AU2007255228B2 (fr)
BR (1) BRPI0712328B1 (fr)
CA (1) CA2597109C (fr)
DE (2) DE202006011980U1 (fr)
ES (1) ES2322211T3 (fr)
GB (1) GB0611430D0 (fr)
MX (1) MX2008015021A (fr)
WO (1) WO2007141466A1 (fr)

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US20120211192A1 (en) * 2011-02-17 2012-08-23 Foseco International Limited Feeder element
US20130306685A1 (en) * 2012-05-15 2013-11-21 Foseco International Limited Feeder element
EP2792432A1 (fr) * 2013-04-16 2014-10-22 Foseco International Limited Élément d'alimentation
US9987676B2 (en) 2013-02-15 2018-06-05 Chemex Gmbh Feeder insert and method for arranging same in a casting mold
WO2020156770A1 (fr) 2019-01-31 2020-08-06 Chemex Foundry Solutions Gmbh Corps de masselotte en une pièce a utiliser lors du coulage de métaux

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WO2017007433A1 (fr) * 2015-07-08 2017-01-12 Gündoğdu Muhittin Noyau conique de rupteur de métal
RU2682731C2 (ru) * 2015-09-02 2019-03-21 Фосеко Интернэшнл Лимитед Система питателя
JP6669858B2 (ja) 2015-09-02 2020-03-18 フォセコ インターナショナル リミテッドＦｏｓｅｃｏ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｌｉｍｉｔｅｄ 押湯システム
TR201714494A2 (tr) * 2017-09-28 2019-04-22 Cukurova Kimya Enduestrisi A S Besleyici gömlek koruma elemanı.
TR201716582A2 (tr) * 2017-10-26 2019-05-21 Cukurova Kimya Enduestrisi A S Besleyici gömlek sabitleme sistemi.
DE102017131280A1 (de) * 2017-12-22 2019-06-27 Chemex Foundry Solutions Gmbh Verfahren zum Herstellen eines Formteils sowie Speisereinsatz zur Verwendung in einem solchen Verfahren
TWI823196B (zh) * 2021-11-26 2023-11-21 財團法人金屬工業研究發展中心 自動生成冒口之系統與方法
DE202022105722U1 (de) * 2022-10-11 2022-11-04 Ask Chemicals Gmbh Speiser mit beweglicher Tülle

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
US20120211192A1 (en) * 2011-02-17 2012-08-23 Foseco International Limited Feeder element
US8430150B2 (en) * 2011-02-17 2013-04-30 Foseco International Limited Feeder element
US20130306685A1 (en) * 2012-05-15 2013-11-21 Foseco International Limited Feeder element
US9027801B2 (en) * 2012-05-15 2015-05-12 Foseco International Limited Feeder element
US9987676B2 (en) 2013-02-15 2018-06-05 Chemex Gmbh Feeder insert and method for arranging same in a casting mold
EP2792432A1 (fr) * 2013-04-16 2014-10-22 Foseco International Limited Élément d'alimentation
WO2020156770A1 (fr) 2019-01-31 2020-08-06 Chemex Foundry Solutions Gmbh Corps de masselotte en une pièce a utiliser lors du coulage de métaux
DE102019102449A1 (de) * 2019-01-31 2020-08-06 Chemex Foundry Solutions Gmbh Einteiliger Speiserkörper zur Verwendung beim Gießen von Metallen

Also Published As

Publication number Publication date
ATE424950T1 (de) 2009-03-15
GB0611430D0 (en) 2006-07-19
DE602007000670D1 (de) 2009-04-23
WO2007141466A1 (fr) 2007-12-13
CN101466488A (zh) 2009-06-24
AU2007255228B2 (en) 2010-10-14
CA2597109C (fr) 2008-11-18
BRPI0712328A2 (pt) 2012-01-10
BRPI0712328B1 (pt) 2015-12-08
EP1879710B1 (fr) 2009-03-11
EP1879710A1 (fr) 2008-01-23
ES2322211T3 (es) 2009-06-17
AU2007255228A1 (en) 2007-12-13
KR20090016577A (ko) 2009-02-16
JP5068312B2 (ja) 2012-11-07
CA2597109A1 (fr) 2007-11-12
JP2009539612A (ja) 2009-11-19
MX2008015021A (es) 2009-02-20
KR101361436B1 (ko) 2014-02-10
DE202006011980U1 (de) 2006-10-05

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