US20050247424A1 - Sleeve, production method thereof and mixture for production of same - Google Patents

Sleeve, production method thereof and mixture for production of same Download PDF

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Publication number
US20050247424A1
US20050247424A1 US10/526,856 US52685605A US2005247424A1 US 20050247424 A1 US20050247424 A1 US 20050247424A1 US 52685605 A US52685605 A US 52685605A US 2005247424 A1 US2005247424 A1 US 2005247424A1
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US
United States
Prior art keywords
sleeve
exothermic
procedure according
resins
production
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/526,856
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English (en)
Inventor
Jaime Prat Urreiztieta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iberia Ashland Chemical SA
Original Assignee
Iberia Ashland Chemical SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Iberia Ashland Chemical SA filed Critical Iberia Ashland Chemical SA
Assigned to IBERIA ASHLAND CHEMICAL, S.A. reassignment IBERIA ASHLAND CHEMICAL, S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PRAT URREIZTIETA, JAIME
Publication of US20050247424A1 publication Critical patent/US20050247424A1/en
Priority to US12/026,697 priority Critical patent/US20080121363A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • 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
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture
    • B22D7/10—Hot tops therefor
    • B22D7/104—Hot tops therefor from exothermic material only

Definitions

  • This invention refers to exothermic sleeves for obtaining mini-deadheads applicable in the obtaining of cast pieces, especially in ductile iron, in the procedure for its production by blowing and curing and in the mixture which constitutes said sleeve.
  • the production of cast metallic pieces comprises the pouring of the molten metal into a mould, the solidification of the metal by cooling and the de-moulding or extraction of the piece formed by means of the removal or destruction of the mould.
  • the moulds can be metallic or they can be formed by aggregates of different materials (ceramics, graphite and, mainly, sand). These moulds need to have some sprues or runners for communication between the internal cavity and the exterior, through which the molten metal is poured in the moulding or casting phase. Due to the contraction of the metal during the cooling process, some overflows have to be foreseen in the mould which are filled with reserve molten metal with the object of forming a deadhead intended to offset the contractions or cavities in the metal. The purpose of the deadhead is to feed the piece when the melt contracts in this, for which reason the metal has to remain in the deadhead in a liquid state for a longer period of time than the piece. For this reason, the deadheads are usually covered with some sleeves, consisting of insulating and/or exothermic materials, which slow the cooling of the metal contained in the deadheads in order to guarantee the fluidity thereof when cavity voids are produced in the cast metal.
  • exothermic sleeves around the deadheads allows contraction problems to be reduced and the quality of the cast pieces to be improved, which allows smaller deadheads (mini-deadheads) to be employed which improve production and reduce the contact surface of the deadhead with the cast piece, the elimination of which costs money.
  • Exothermic sleeves are known based on fibres manufactured in a wet process starting with a fibrous refractory material combined with a mixture of materials capable of producing an exothermic reaction constituted by an oxidizable metal, in which aluminium is habitually the most used, an oxidizing agent and a fusing agent or initiator of the exothermic reaction which, habitually, is a fluorinated compound.
  • the oxidizable metal when mixed with the oxidizing agent and the fusing agent and exposed to extreme heat, is oxidized liberating heat in proportion to the advancing reaction.
  • Exothermic sleeves are also known based on sand, highly appreciated in ductile iron foundries.
  • the composition of these high-density sand-based sleeves contains a greater quantity of aluminium very high so that the amount of heat produced is very high. This heat is necessary to raise the temperature of the sand-based sleeve before favourably influencing the temperature of the metal in the deadhead.
  • the patent application WO 97/00172 discloses a procedure for blowing and cold box curing to manufacture dimensionally accurate, exothermic and/or insulating sleeves, based on a mixture blowable into a mould, said mixture consisting of microspheres of aluminium silicate with an alumina content of less than 38% by weight, a binding agent for cold box curing and, optionally, some non-fibrous loads.
  • a typical composition for the production of exothermic sleeves comprises hollow microspheres with an alumina content of less than 38% by weight, aluminium powder, iron oxide and cryolite as fluorinated flux.
  • the invention arises from the challenge of furnishing a sleeve for obtaining mini-deadheads which does not require the use of a fluoride-free biscuit, nor of any other element to avoid contact of the sleeve with the piece and which, moreover, produces in the deadhead a notch to facilitate its later separation from the cast piece and all this based on a blowable mixture, without fluorine, capable of producing an exothermic reaction for the provision of the heat required.
  • the starting point for this is, in the first place, blowing the mixture which will constitute the fluoride-free sleeve, into a mould which has two cores which, on one hand, will make possible the extraction of the sleeve once cured and, on the other hand, the obtaining of two orifices: one of them in the actual mouth of the sleeve, the orifice of which has a double interior circumferential chamfer, capable of producing an equivalent notch in the deadhead when the sleeve performs its function at the time of the casting.
  • This exothermic sleeve for obtaining mini-deadheads is obtained by cold box blowing and subsequent curing of a fluoride-free mixture which comprises (a) hollow spheres of alumina silicate; (b) an exothermic material which comprises:
  • Hollow microspheres of aluminium silicate are basically used as insulating material. Mixtures of these aluminium silicate spheres with sand can also be used, when it is necessary to improve the mechanical properties of the sleeve, to the detriment of the insulating properties.
  • oxidizable metals aluminium silicon and others can be used.
  • aluminium in a combination of fine and coarse powder.
  • oxidizing agents nitrates, chlorates, permanganates and metallic oxides such as iron and magnesium oxide can be used and, of course, combinations of these compounds.
  • magnesium is used as initiator of the exothermic reaction.
  • FIG. 1 illustrates the steps for the production of a sleeve by means of a conventional procedure of blowing and cold box curing pertaining to the state of the art.
  • the mixture for the production of sleeves is blown into a mould ( 3 ) with the collaboration of a core ( 2 ) [ FIG. 1A ]; next, the sleeve ( 1 ) is cured and de-moulded leaving the void intended for the deadhead ( 4 ) [ FIG. 1B ]; and, finally, an intermediate biscuit ( 5 ) is applied which has an orifice ( 6 ) for the melt to pass [ FIG. 1C ].
  • FIG. 2 illustrates the steps for production of an exothermic sleeve according to the procedure of blowing and cold box curing disclosed by the present invention.
  • the invention is related with a procedure for the production by blowing and cold box curing of an exothermic sleeve for obtaining mini-deadheads which comprises:
  • the fluoride-free mixture for the production of exothermic sleeves is blown inside a mould, in the space defined between the mould ( 3 ) and the cores ( 2 , 2 ′) [ FIG. 2A ].
  • the sleeve ( 1 ) is cured, it is de-moulded leaving the void intended for the deadhead ( 4 ) [ FIG.
  • a plug ( 9 ) is located in an open end of the sleeve ( 1 ) for the purpose of preventing sand or of any other undesirable element from entering inside the cavity intended for the deadhead during the casting operation [ FIG. 2C ].
  • the double chamfer ( 8 ) of the sleeve will produce in the deadhead a rut or slot equivalent in form which defines and facilitates the cutting line for the separation of the deadhead from the piece.
  • the insulating/refractory material (a.1) present in the fluoride-free composition for the production of sleeves is a material which basically comprises hollow microspheres of aluminium silicate, although it could also contain a certain quantity of sand, on the assumption that, by sacrificing insulating capacity, it is desired to improve the mechanical properties of the sleeve.
  • the quantity of insulating/refractory material (a.1) will be between 30 and 70% by weight with respect to the total of the fluoride-free composition.
  • the exothermic material (a.2) present in the fluoride-free composition for the production of sleeves comprises an oxidizable metal and an oxidizing agent capable of producing an exothermic reaction, wherein said exothermic material comprises:
  • a property of the composition for the production of the exothermic sleeves according to the present invention resides in that said composition comes without the inorganic fluorinated flux habitually utilized as initiators of the exothermic reaction. Magnesium is used in place thereof, which reacts at a lower temperature whereby the exothermic reaction produced between the oxidizable metal and the oxidizing agent begins earlier.
  • the reaction between the oxidizable metal and the oxidizing agent is an exothermic reaction which produces heat thereby enhancing the heating properties of the exothermic sleeves.
  • the loss of temperature is reduced of the molten material in the sprue, which is kept hotter and liquid for a longer time.
  • the quantity of oxidizable metal present in the exothermic material (a.2) will be between 20 and 30% by weight with respect to the total of the fluoride-free composition for the production of the sleeve.
  • the procedure disclosed by this invention allows exothermic sleeves to be obtained with the desired balance of insulating and exothermic properties merely by using the quantities of insulating material (a.1) and of material exothermic (a.2) present in component A in the appropriate ratios by weight.
  • the cold box curing binding agents which can be used in the mixture for the production of sleeves according to the sleeve manufacturing procedure disclosed by this invention are known.
  • any cold box curing binding agent can be used which is capable of maintaining the fluoride-free composition for the production of sleeves in the form of a sleeve and polymerise in presence of a curing catalyst.
  • phenol resins phenol-urethane resins
  • epoxy acrylic resins epoxy acrylic resins
  • alkaline phenol resins resins of silicates, etc. activated by an appropriate catalyst in the gaseous phase.
  • this cold box curing binding agent is selected from among the epoxy acrylic resins activated by SO 2 (gas) and the phenol-urethane resins activated by amine (gas) known as cold box curing binding agents EXACTCAST® (Ashland).
  • the necessary quantity of cold box curing binding agent is the effective quantity to maintain the form of the sleeve and to permit its effective curing, that is, a quantity such as allows a sleeve to be produced which can be handled after the curing process.
  • the quantity of cold box curing binding agent will be between 1 and 10% with respect to the total of the composition for the production of the sleeve.
  • the catalyst for cold box curing is applied in gas form and is made to pass through the sleeve until the latter reaches a manageable consistency.
  • the catalyst in the gaseous phase can be an amine, carbon dioxide, methyl formate, sulphur dioxide, etc. depending on the cold box curing binder utilized.
  • exothermic sleeves can be obtained with both internal and external dimensional accuracy, which can be coupled easily to the moulding assembly in the foundry after being manufactured with no need to carry out additional manipulations.
  • the sleeve ( 1 ) provided by this invention comprises:
  • the double chamfer ( 8 ) present in the sleeve provided by this invention is due to the combined action of 2 cores ( 2 , 2 ′) during the blowing of the mixture.
  • the double chamfer ( 8 ) will define in the deadhead a rut or slot which facilitates the separation of the same from the cast piece.
  • said plug ( 9 ) has no structural purpose nor does it intervene in the formation or action of the deadhead, and, for this reason, the material used in the production of the plug can be practically any material, advantageously, a cheap material, such as plastic, wood, sawdust, paper, sand, etc., or even the actual material constituting the sleeve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Powder Metallurgy (AREA)
  • Soft Magnetic Materials (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Organic Insulating Materials (AREA)
  • Materials For Medical Uses (AREA)
US10/526,856 2002-09-09 2002-09-09 Sleeve, production method thereof and mixture for production of same Abandoned US20050247424A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/026,697 US20080121363A1 (en) 2002-09-09 2008-02-06 Sleeve, procedure for the manufacture thereof and mixture for the production of said sleeve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2002/000422 WO2004022262A1 (es) 2002-09-09 2002-09-09 Manguito, procedimiento para su fabricación y mezcla para la producción de dicho manguito

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/026,697 Continuation US20080121363A1 (en) 2002-09-09 2008-02-06 Sleeve, procedure for the manufacture thereof and mixture for the production of said sleeve

Publications (1)

Publication Number Publication Date
US20050247424A1 true US20050247424A1 (en) 2005-11-10

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Family Applications (2)

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US10/526,856 Abandoned US20050247424A1 (en) 2002-09-09 2002-09-09 Sleeve, production method thereof and mixture for production of same
US12/026,697 Abandoned US20080121363A1 (en) 2002-09-09 2008-02-06 Sleeve, procedure for the manufacture thereof and mixture for the production of said sleeve

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/026,697 Abandoned US20080121363A1 (en) 2002-09-09 2008-02-06 Sleeve, procedure for the manufacture thereof and mixture for the production of said sleeve

Country Status (16)

Country Link
US (2) US20050247424A1 (ja)
EP (1) EP1543897B1 (ja)
JP (1) JP4413780B2 (ja)
CN (1) CN1305601C (ja)
AT (1) ATE365086T1 (ja)
AU (1) AU2002336110B2 (ja)
BR (1) BR0215879B1 (ja)
CA (1) CA2498240C (ja)
DE (1) DE60220841T2 (ja)
DK (1) DK1543897T3 (ja)
ES (1) ES2288560T3 (ja)
HK (1) HK1078288A1 (ja)
MX (1) MXPA05002612A (ja)
PT (1) PT1543897E (ja)
SI (1) SI1543897T1 (ja)
WO (1) WO2004022262A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD872781S1 (en) * 2018-04-13 2020-01-14 Foseco International Limited Breaker core

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4749948B2 (ja) * 2006-06-23 2011-08-17 滲透工業株式会社 鋳造用発熱性造形品
DE102008058205A1 (de) * 2008-11-20 2010-07-22 AS Lüngen GmbH Formstoffmischung und Speiser für den Aluminiumguss
CN101549387B (zh) * 2009-05-18 2011-04-20 谢锦荣 一种圆柱形保温冒口的底座
WO2011154561A1 (es) 2010-06-08 2011-12-15 Iberia Ashland Chemical, S.A. Procedimiento de obtencion de una pieza metalica
CN102328027A (zh) * 2011-07-13 2012-01-25 中核苏阀横店机械有限公司 一种保温冒口防堵结构
CN103551515B (zh) * 2013-11-22 2015-05-13 哈尔滨理工大学 铸造用发热保温冒口及其制备方法
CN103586416B (zh) * 2013-11-28 2015-06-17 哈尔滨理工大学 一种无氟发热保温冒口的制备方法
RU2601721C2 (ru) * 2015-03-11 2016-11-10 федеральное государственное бюджетное образовательное учреждение высшего образования "Нижегородский государственный технический университет им. Р.Е. Алексеева" (НГТУ) Экзотермическая смесь для обогрева прибылей стальных и чугунных отливок
CN108296446B (zh) * 2018-01-25 2019-11-05 宁夏共享能源有限公司 持续发热的铸造保温冒口及其制备方法
CN111889629A (zh) * 2020-08-14 2020-11-06 欧区爱铸造材料（中国）有限公司 一种铸造冒口加热用无氟高效发热剂
US20240189889A1 (en) 2021-04-16 2024-06-13 Foseco International Limited Refractory article and composition

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Publication number Priority date Publication date Assignee Title
US3803703A (en) * 1971-08-17 1974-04-16 Canada Wire & Cable Co Ltd Welding of hollow core aluminum conductors
US3815665A (en) * 1971-09-15 1974-06-11 E Bauer Casting mold and basin-like riser therefor
US3923526A (en) * 1972-07-22 1975-12-02 Aikoh Co Heat-insulating board for covering the top surface of a feeder head
US4008109A (en) * 1975-07-01 1977-02-15 Chemincon Incorporated Shaped heat insulating articles
US4574869A (en) * 1981-01-22 1986-03-11 Foseco International Limited Casting mould, and cavity former and sleeve for use therewith
US4719958A (en) * 1986-01-14 1988-01-19 Foseco International Ltd. Method, apparatus and feeder sleeves for the production of casting moulds
US5299625A (en) * 1991-10-03 1994-04-05 Masamitsu Miki Riser sleeve with breaker core
US6197850B1 (en) * 1996-07-18 2001-03-06 Kemen Recupac, S.A. Process for fabricating couplings and other elements for hot topping and supply for castiron molds, and formulation for producing such couplings and elements
US6343642B1 (en) * 1997-10-01 2002-02-05 Masamitsu Miki Riser sleeve
US6360808B1 (en) * 2000-06-19 2002-03-26 Ashland Inc. Exothermic sleeve compositions containing aluminum dross

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US5252526A (en) * 1988-03-30 1993-10-12 Indresco Inc. Insulating refractory
GB9308363D0 (en) * 1993-04-22 1993-06-09 Foseco Int Refractory compositions for use in the casting of metals
JP3374242B2 (ja) * 1998-10-09 2003-02-04 正光 三木 鋳物用発熱性アセンブリ
DE19925167A1 (de) * 1999-06-01 2000-12-14 Luengen Gmbh & Co Kg As Exotherme Speisermasse
CN2465837Y (zh) * 2001-02-12 2001-12-19 盛天良 冒口颈盘

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803703A (en) * 1971-08-17 1974-04-16 Canada Wire & Cable Co Ltd Welding of hollow core aluminum conductors
US3815665A (en) * 1971-09-15 1974-06-11 E Bauer Casting mold and basin-like riser therefor
US3923526A (en) * 1972-07-22 1975-12-02 Aikoh Co Heat-insulating board for covering the top surface of a feeder head
US4008109A (en) * 1975-07-01 1977-02-15 Chemincon Incorporated Shaped heat insulating articles
US4574869A (en) * 1981-01-22 1986-03-11 Foseco International Limited Casting mould, and cavity former and sleeve for use therewith
US4719958A (en) * 1986-01-14 1988-01-19 Foseco International Ltd. Method, apparatus and feeder sleeves for the production of casting moulds
US5299625A (en) * 1991-10-03 1994-04-05 Masamitsu Miki Riser sleeve with breaker core
US6197850B1 (en) * 1996-07-18 2001-03-06 Kemen Recupac, S.A. Process for fabricating couplings and other elements for hot topping and supply for castiron molds, and formulation for producing such couplings and elements
US6343642B1 (en) * 1997-10-01 2002-02-05 Masamitsu Miki Riser sleeve
US6360808B1 (en) * 2000-06-19 2002-03-26 Ashland Inc. Exothermic sleeve compositions containing aluminum dross

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD872781S1 (en) * 2018-04-13 2020-01-14 Foseco International Limited Breaker core
USD881240S1 (en) 2018-04-13 2020-04-14 Foseco International Limited Breaker core

Also Published As

Publication number Publication date
CA2498240C (en) 2009-05-19
WO2004022262A1 (es) 2004-03-18
DE60220841D1 (de) 2007-08-02
BR0215879B1 (pt) 2014-01-21
US20080121363A1 (en) 2008-05-29
HK1078288A1 (en) 2006-06-09
ATE365086T1 (de) 2007-07-15
BR0215879A (pt) 2005-08-02
CA2498240A1 (en) 2004-03-18
AU2002336110A1 (en) 2004-03-29
JP2005537935A (ja) 2005-12-15
CN1668402A (zh) 2005-09-14
JP4413780B2 (ja) 2010-02-10
EP1543897B1 (en) 2007-06-20
AU2002336110B2 (en) 2009-09-03
SI1543897T1 (sl) 2007-12-31
CN1305601C (zh) 2007-03-21
DE60220841T2 (de) 2008-02-28
PT1543897E (pt) 2007-09-12
DK1543897T3 (da) 2007-09-24
EP1543897A1 (en) 2005-06-22
ES2288560T3 (es) 2008-01-16
MXPA05002612A (es) 2005-05-05

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AS Assignment

Owner name: IBERIA ASHLAND CHEMICAL, S.A., SPAIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PRAT URREIZTIETA, JAIME;REEL/FRAME:016818/0084

Effective date: 20050222

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION