US3923526A - Heat-insulating board for covering the top surface of a feeder head - Google Patents

Heat-insulating board for covering the top surface of a feeder head Download PDF

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Publication number
US3923526A
US3923526A US321425A US32142573A US3923526A US 3923526 A US3923526 A US 3923526A US 321425 A US321425 A US 321425A US 32142573 A US32142573 A US 32142573A US 3923526 A US3923526 A US 3923526A
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weight
heat
expanded
molding
insulating board
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Expired - Lifetime
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US321425A
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English (en)
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Masaru Takashima
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Aikoh Co Ltd
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Aikoh Co Ltd
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    • 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

Definitions

  • Zinn & Macpeak [30] Foreign Application Priority Data July 22, 1972 Japan 47-73538 57 ABSTRACT 5 5 CL 106/3822; 106/3825; 106/3827; A heat-insulating board for covering the top surface of 106/3828 a feeder head.
  • the heat-insulating board is composed [51] Int. Cl.
  • the present invention relates to a heat-insulating board for covering the top surface of the molten metal in a feeder head during the casting of a molten metal, particularly a molten steel.
  • the present invention provides a heat-insulating board for covering the top surface of a feeder head of molten metal which contains a material which expands upon being heated, or a mixture of such materials.
  • the heat-insulating board is used in combination with a heat-insulating sleeve or slab for heatinsulating the side surface of the feeder head, and the heat-insulating board is expanded during use when the heat-expandable material(s) expand by the action of the heat from the molten metal to be cast, whereby any gap between the heat-insulating board and the sleeve, slab or a side wall of a casting mold is closed.
  • a heat-insulating agent such as an exothermic powder, as is conventionally used for covering the top surface of the feeder head, is composed of fine powdery light substances, and these fine powdery substances are violently scattered when the agent is added to the top surface of molten metal, and during the exothermic reaction which occurs after the addition of the same. Consequently, a large amount of smoke and dust is generated which interferes with the casting operation. Moreover, the smoke and dust are harmful to humans and thus the use of such a heat-insulating agent is unfavorable from the view-point of environmental sanitation.
  • the heat-insulating boards which have been used to cover the top surface of the feeder head eliminate the abovementioned defects of the heat-insulating agent.
  • a gap occurs between the board and the sleeve or slab which is provided to heat-insulate the side surface of the feeder head or the side wall of the mold.
  • the present invention provides a novel heat-insulating board for covering the top surface of a feeder head which consists of a plate-like molding and a heatexpandable composition.
  • the heat-expandable compositon may be attached to the outer face of the plate-like molding or may be uniformly mixed with the plate-like molding.
  • the outer face of the plate-like molding will be referred to as the rim thereof.
  • the heat-expandable composition when attached to the outer face, need only be provided at a part of the outer face to achieve the expansion/sealing, action upon heating.
  • the heat-expandable materials are provided at only the lower portion of the outer face of the plate-like molding.
  • the platelike molding may be a homogeneous mixture with the heat-expandable material
  • an embodiment intermediate those described above is operable if only the outer portions of the plate-like molding are mixed with the expandable material, e.g., during water removal if a slurry is formed.
  • the diameter of the plate-like molding is much greater than the thickness, in both embodiments described above when the plate-like molding is heated on contact with the molten metal, it expands primarily in a plane perpendicular to the sides of the mold, and thereby seals any gap between the plate-like molding and the side of the mold or sleeve or slab (if such is interposed between the plate-like molding and the wall of the mold,) and completely covers the top surface of the molten metal in the feeder head. Accordingly, the heatinsulating effect on the feeder head is greatly improved by the use of the present heat-insulating board.
  • FIG. 1 is a sectional view of an upper part of a mold in which a heat-insulating board according to the present invention is provided in the upper portion thereof.
  • FIG. 2 is an enlarged section of the heat-insulating board of FIG. 1.
  • FIG. 3 and FIG. 4 are sectional views of other embodiments of heat-insulating boards in accordance with the present invention.
  • FIG. 5 is a sectional view of the upper part of a mold in which still another heat-insulating board according to the present invention has been provided in the upper portion thereof.
  • FIG. 6 and FIG. 7 are sectional views of additional embodiments of heat-insulating boards according to the present invention which are different from those shown in FIGS. 1-5.
  • composition containing [heat-expandable materials of the present invention preferably consists of the following ingredients:
  • heat-expandable materials are known, and have been used as an ingredient for a feeder head heatinsulating composition.
  • the above described heat-expandable composition is attached to or will comprise the outer rim of the plate-like molding.
  • the plate-like molding is preferably either a one-layer molding comprising a uniform composition, or a two-layer molding comprising an exothermic inner layer which will be in contact with the top surface of the molten metal and an adiabatic outer layer.
  • Preferred embodiments of a one-layer molding and a two-layer molding are described below:
  • the above described heatexpandable material(s) may be uniformly incorporated into the plate-like molding.
  • the heat-insulating board thus prepared will expand primarily outwardly towards the walls of the mold to closely seal any gap between the board and azsleeve or slab for heat-insulating the side surface of the feeder head of the side wall of a mold, and simultaneously the board is expanded also in its thickness thereby to become a porous heat-insulating board.
  • a heat-insulating board of this kind will have an improved heat-insulating effect.
  • Non-porous refractory material such as silica sand, quartz, magnesia (magnesium oxide), alumina (aluminum oxide), olivine, aluminum ash, dolomite, magnesite, limestone, chamotte, Corundum, Alundum (trade name), and the like, and porous refractory materials such as diatomaceous earth, lapilli, expanded vermiculite, expanded shale, expanded obsidina, expanded perlite, expanded pitch-stone, and the like.
  • the easily oxidizable metal the following are preferred: Aluminum, magnesium, aluminum-magnesium alloys, calcium-silicon alloys, iron-silicon alloys, and the like. These metals react with an oxidizing agent by an exothermic reaction to heat the top surface of the feeder head.
  • the oxidizing agent the following are exemplary: Metal oxides such as ferrous oxide, ferric oxide, tri-iron tetraoxide, manganese dioxide, chromic oxide and the like, and nitrates such as potassium nitrate, sodium nitrate, barium nitrate, and the like.
  • the fibrous material As the fibrous material, the following are preferred: Refractory inorganic fibrous materials such as asbestos, rock wool, slag wool, glass wool, refractory clays and fibrous materials, and the like, and organic fibrous materials such as cellulosic materials derived from paper, paper wood, saw dust, wood meal, chemical fibers and the like. These fibrous materials reinforce the heatinsulating board so that the board is not damaged by any impact during the treatment of the board such as a transfer thereof, the disposition thereof in the mold, etc. Further, by the use of such a fibrous material, the resulting heat-insulating board can become a porous board which has a low bulk specific gravity, whereby the heat-insulating effect thereof is improved.
  • Refractory inorganic fibrous materials such as asbestos, rock wool, slag wool, glass wool, refractory clays and fibrous materials, and the like
  • organic fibrous materials such as cellulosic materials derived from paper, paper wood, saw dust, wood meal, chemical fibers and the like.
  • the carbonaceous substance is, for example, coke, charcoal, coal, black lead, graphite, carbonized materials such as carbonized grain stems, carbonized grain seed husks and the like.
  • oxidation accelerating agent sodium fluoride, calcium fluoride, cryolite and the like are suitable. These substances accelerate the oxidation reaction of the easily oxidizable metals described above.
  • Resin binders such as phenol-formaldehyde resins, urea-formaldehyde resins, furan resins, epoxy resins, and the like, and water glass, various types of cements, various kinds of clays, dextrin, starch and the like.
  • a heat-insulating board of the present invention is provided in a mold 1 in such manner that the hollow space of the upper portion of the mold is covered with the board, which mold is lined with a slab 2 at the inner surface of the upper part thereof for the purpose of heat-insulating the side surfaces of the feeder head.
  • the board consists of a platelike molding 3 and a composition 4 attached to the outer rim of the molding 3, which composition 4 contains a heat-expandable material or a mixture of such materials.
  • the board is fixed to the mold by means of a thin steel plate or a steel wire 5 fixed to the board by a nail or a rivet 6.
  • a molten metal particularly a molten steel
  • the composition 4 is expanded by the action of a heat of the molten steel to fill the gap between the board and the slab 2,whereby the atmosphere is excluded from the surface of the molten metal and the heat-insulation of the feeder head is improved.
  • FIG. 2 is an enlarged section of the heat-insulating board shown in FIG. 1. i
  • FIGS. 3 and 4 there are shown other heat-insulating boards according to the present invention which are different from the board shown in FIGS. 1 and 2.
  • the heat-insulating board consists of a plate-like molding 3 which is composed of two layers, namely, an exothermic inner layer 7 in contact with the top surface of the molten metal and an adiabatic outer layer 8.
  • a heatinsulating board is provided in a mold l, where the upper portion thereof is lined with a slab 2 for heatinsulating the side surfaces of the feeder head, in such a manner that the board covers the hollow space of the mold I.
  • a piercing hole 9 is provided in this heatinsulating board. The piercing hole 9 is closed with a plug 10, provided with a bent metal fitting 11, immediately after pouring of the molten steel has been completed.
  • FIGS. 6 and 7 show still other embodiments of the present heat-insulating boards 12, wherein heat-expandable materials are uniformly incorporated therein, the board 12 is expanded outwardly to closely seal the cap between the board and a sleeve or slab for heat-insulating the side surfaces of the feeder head or the side wall of the mold, and simultaneously the board expands in the direction of its thickness, whereby the board becomes a porous heatinsulating board which provides an improved heatinsulating effect.
  • a number of small holes 13 are shown in the heat-insulating board. From these small holes 13 any gas which is generated during the casting operation can be discharged. These small holes 13 will be closed due to the expansion of the board after the gas has been discharged, i.e., when the top surface of the molten steel comes close to or comes in contact with the board.
  • EXAMPLE 1 l A composition to be provided on the outer rim of a molding was formed of the following ingredients:
  • a heat-insulating board was formed of the following ingredients:
  • Example 2 In the manner as described in Example 1, a slurry was prepared from the mixture of the above ingredients. The slurry was charged into a model for dehydrating and molding, and the water in the slurry is removed. The thus treated slurry was molded to form a plate-like molding. Drying the molding, a heat-insulating board is prepared as shown in FIG. 6, which had a size of 830 mm (length) 830 mm (width)X40 mm (thickness).
  • the results were as follows: The average yield of the ingots cast using the heat-insulating board of the present invention was improved 1.4% as compared with the ingots cast using the conventional board. This was due to the superior heat-insulating effect attained by the use of the present board on the feeder head of the molten steel.
  • a heat-insulating board for covering the top surface of a feeder head which comprises a plate-like molding and a composition attached to the outer rim of the plate-like molding; said composition comprising 80% by weight ofa chemically treated heat-expandable material of flake-like graphite or pitch treated with an acid and/or an oxidizing agent, 092% by weight of a refractory material, 0-30% by weight of an easily oxidizable metal, 0-30% by weight of an oxidizing agent, 040% by weight of a non-metallic fibrous material, Y-% by weight of a carbonaceous substance, 0l0% by weight of an oxidation accelerating agent and 3-20% by weight of a binder; said plate-like molding comprising 20-94% by weight of a refractory material selected from the group of silica sand, quartz, magnesia (magnesium oxide), alumina (aluminum oxide), olivine, aluminum ash, dolomite, magnesite
  • the plate-like molding comprises a two-layer molding having an inner layer which is placed in contact with the top surfact of the molten metal, and an outer layer; the inner layer comprising 3-30% by weight of an easily oxidizable metal, 330% by weight of an oxidizing agent, 10-8 8% by weight ofa refractory material selected from the group of silica sand, quartz, magnesia (magnesium oxide), alumina (aluminum oxide), olivine, aluminum ash, dolomite, magnesite, limestone, chamotte, corundum, diatomaceous earth, lapilli, expanded vermiculite, expanded shale, expanded obsidina, expanded perlite and expanded pitch-stone, 3-40% by weight of a fibrous material, 0-20% by weight of a carbonaceous substance, 0-10% by weight of an oxidation accelerating agent, and 3-20% by weight of a binder; and the outer layer comprising 40-9
  • a heat-insulating board according to claim 1 wherein said board expands primarily in a plane of its greatest dimension when heated to completely cover and seal the top surface of said feeder head.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Peptides Or Proteins (AREA)
  • Thermal Insulation (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Building Environments (AREA)
US321425A 1972-07-22 1973-01-05 Heat-insulating board for covering the top surface of a feeder head Expired - Lifetime US3923526A (en)

Applications Claiming Priority (1)

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JP47073538A JPS4931535A (enrdf_load_stackoverflow) 1972-07-22 1972-07-22

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US (1) US3923526A (enrdf_load_stackoverflow)
JP (1) JPS4931535A (enrdf_load_stackoverflow)
AU (1) AU475728B2 (enrdf_load_stackoverflow)
BR (1) BR7301499D0 (enrdf_load_stackoverflow)
FR (1) FR2193668B1 (enrdf_load_stackoverflow)
GB (1) GB1417314A (enrdf_load_stackoverflow)
SE (1) SE391465B (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025047A (en) * 1974-04-11 1977-05-24 Aikoh Co., Ltd. Moulding for the heat retention of feeder head in casting molten metals
US4046187A (en) * 1974-06-24 1977-09-06 Aikoh Co., Ltd. Process of manufacturing killed steel ingots of superior quality
US4261750A (en) * 1980-03-26 1981-04-14 Pittsburgh Metals Purifying Company Improved exothermic anti-piping composition
WO1981001283A1 (en) * 1979-10-30 1981-05-14 Crosby Doors Ltd Heat resistant composition
US4354658A (en) * 1979-12-06 1982-10-19 Ab Indesko Hot top construction
US4440575A (en) * 1979-06-11 1984-04-03 Daussan Jean Granular insulation product and process for its preparation
US4462834A (en) * 1983-06-16 1984-07-31 Labate M D Ladle covering compound
US4588442A (en) * 1982-08-20 1986-05-13 Colin Richmond Refractory composition
US5115602A (en) * 1989-02-24 1992-05-26 Etat Francais, Represente Par Le: Laboratoire Central Des Ponts Et Chaussees Insulating and structural masonry block and method for the fabrication thereof
US5187991A (en) * 1989-09-12 1993-02-23 Electro-Nite International N.V. Device for withdrawing samples from molten metals
US20040256075A1 (en) * 2001-11-20 2004-12-23 Jurgen-Michael Schafer Feeder insert having protective cap
US20050247424A1 (en) * 2002-09-09 2005-11-10 Iberia Ashland Chemical, S.A. Sleeve, production method thereof and mixture for production of same
US6972059B1 (en) * 1999-06-01 2005-12-06 As Lungen Gmbh & Co. Kg Exothermic feeder
US20070051200A1 (en) * 2005-09-08 2007-03-08 Pierre Vayda Composite briquettes for electric furnace charge, and in their method of use
US20150344799A1 (en) * 2014-05-29 2015-12-03 Pierre Vayda Composite briquette for steelmaking or ironmaking furnace charge
US20150344989A1 (en) * 2014-05-29 2015-12-03 Pierre Vayda Composite briquette for steelmaking or ironmaking furnace charge
US20170010306A1 (en) * 2015-07-07 2017-01-12 Samsung Electronics Co., Ltd. Probe card, thermal insulation cover assembly for probe card, and semiconductor device test apparatus including the same
WO2021184834A1 (zh) * 2020-03-19 2021-09-23 山东春秋新材料股份有限公司 一种低发气量组合式发热冒口

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421414A (en) * 1977-07-19 1979-02-17 Foseco Trading Ag Fireeresistant* heattgnerating* heattinsulating product and method of making same
JPS59143555U (ja) * 1983-03-16 1984-09-26 大同特殊鋼株式会社 溶鋼湯面被覆用保温ボ−ド
GB8610739D0 (en) * 1986-05-01 1986-06-04 Foseco Int Exothermic compositions
CN112247119A (zh) * 2020-10-22 2021-01-22 朱春强 一种位置可多变的汽车零部件铸造模具

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US2462255A (en) * 1945-07-28 1949-02-22 Ferro Eng Co Insulating cover
US2462256A (en) * 1945-11-02 1949-02-22 Ferro Eng Co Insulating cover
US3297296A (en) * 1962-10-29 1967-01-10 Sandvikens Jernverks Ab Hot top composition for casting molds
US3300322A (en) * 1962-10-27 1967-01-24 Sandvikens Jernverks Ab Hot top
US3308514A (en) * 1965-01-07 1967-03-14 Dow Chemical Co Method of hot topping using vermicular graphite
US3574644A (en) * 1965-03-22 1971-04-13 Dow Chemical Co Method of rendering normally flamable materials flame resistant
US3672918A (en) * 1970-09-14 1972-06-27 Metallurg Exoproducts Corp Hot tops
US3759724A (en) * 1971-09-14 1973-09-18 Shinto Kugyo K K Exhothermic composition for hot tops

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GB1301922A (enrdf_load_stackoverflow) * 1969-02-18 1973-01-04
US3878192A (en) * 1972-06-05 1975-04-15 Blasina Lab Chim Farm Sweet and palatable water soluble derivatives of erythromycin

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2462255A (en) * 1945-07-28 1949-02-22 Ferro Eng Co Insulating cover
US2462256A (en) * 1945-11-02 1949-02-22 Ferro Eng Co Insulating cover
US3300322A (en) * 1962-10-27 1967-01-24 Sandvikens Jernverks Ab Hot top
US3297296A (en) * 1962-10-29 1967-01-10 Sandvikens Jernverks Ab Hot top composition for casting molds
US3308514A (en) * 1965-01-07 1967-03-14 Dow Chemical Co Method of hot topping using vermicular graphite
US3574644A (en) * 1965-03-22 1971-04-13 Dow Chemical Co Method of rendering normally flamable materials flame resistant
US3672918A (en) * 1970-09-14 1972-06-27 Metallurg Exoproducts Corp Hot tops
US3759724A (en) * 1971-09-14 1973-09-18 Shinto Kugyo K K Exhothermic composition for hot tops

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025047A (en) * 1974-04-11 1977-05-24 Aikoh Co., Ltd. Moulding for the heat retention of feeder head in casting molten metals
US4046187A (en) * 1974-06-24 1977-09-06 Aikoh Co., Ltd. Process of manufacturing killed steel ingots of superior quality
US4440575A (en) * 1979-06-11 1984-04-03 Daussan Jean Granular insulation product and process for its preparation
WO1981001283A1 (en) * 1979-10-30 1981-05-14 Crosby Doors Ltd Heat resistant composition
US4354658A (en) * 1979-12-06 1982-10-19 Ab Indesko Hot top construction
US4261750A (en) * 1980-03-26 1981-04-14 Pittsburgh Metals Purifying Company Improved exothermic anti-piping composition
US4588442A (en) * 1982-08-20 1986-05-13 Colin Richmond Refractory composition
US4462834A (en) * 1983-06-16 1984-07-31 Labate M D Ladle covering compound
US5115602A (en) * 1989-02-24 1992-05-26 Etat Francais, Represente Par Le: Laboratoire Central Des Ponts Et Chaussees Insulating and structural masonry block and method for the fabrication thereof
US5187991A (en) * 1989-09-12 1993-02-23 Electro-Nite International N.V. Device for withdrawing samples from molten metals
US6972059B1 (en) * 1999-06-01 2005-12-06 As Lungen Gmbh & Co. Kg Exothermic feeder
US20040256075A1 (en) * 2001-11-20 2004-12-23 Jurgen-Michael Schafer Feeder insert having protective cap
US7156146B2 (en) * 2001-11-20 2007-01-02 Gtp-Schafer Giesstechnishe Produkte Gmbh Feeder insert having protective cap
US20050247424A1 (en) * 2002-09-09 2005-11-10 Iberia Ashland Chemical, S.A. Sleeve, production method thereof and mixture for production of same
US20070051200A1 (en) * 2005-09-08 2007-03-08 Pierre Vayda Composite briquettes for electric furnace charge, and in their method of use
US9499755B2 (en) * 2014-05-29 2016-11-22 Pierre Vayda Composite briquette for steelmaking or ironmaking furnace charge
US20150344989A1 (en) * 2014-05-29 2015-12-03 Pierre Vayda Composite briquette for steelmaking or ironmaking furnace charge
US20150344799A1 (en) * 2014-05-29 2015-12-03 Pierre Vayda Composite briquette for steelmaking or ironmaking furnace charge
US9499878B2 (en) * 2014-05-29 2016-11-22 Pierre Vayda Composite briquette for steelmaking or ironmaking furnace charge
US20170010306A1 (en) * 2015-07-07 2017-01-12 Samsung Electronics Co., Ltd. Probe card, thermal insulation cover assembly for probe card, and semiconductor device test apparatus including the same
KR20170006127A (ko) * 2015-07-07 2017-01-17 삼성전자주식회사 프로브 카드, 프로브 카드용 단열 커버 어셈블리, 및 이를 갖는 반도체 디바이스의 검사 장치
US10082536B2 (en) * 2015-07-07 2018-09-25 Samsung Electronics Co., Ltd. Probe card, thermal insulation cover assembly for probe card, and semiconductor device test apparatus including the same
KR102328101B1 (ko) 2015-07-07 2021-11-17 삼성전자주식회사 프로브 카드, 프로브 카드용 단열 커버 어셈블리, 및 이를 갖는 반도체 디바이스의 검사 장치
WO2021184834A1 (zh) * 2020-03-19 2021-09-23 山东春秋新材料股份有限公司 一种低发气量组合式发热冒口

Also Published As

Publication number Publication date
DE2301228B2 (de) 1976-04-22
AU5070973A (en) 1974-07-04
SE391465B (sv) 1977-02-21
FR2193668A1 (enrdf_load_stackoverflow) 1974-02-22
FR2193668B1 (enrdf_load_stackoverflow) 1976-04-09
AU475728B2 (en) 1976-09-02
DE2301228A1 (de) 1974-02-14
BR7301499D0 (pt) 1974-02-12
GB1417314A (en) 1975-12-10
JPS4931535A (enrdf_load_stackoverflow) 1974-03-22

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