EP0076564B1 - Masselottes d'alimentation - Google Patents

Masselottes d'alimentation Download PDF

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Publication number
EP0076564B1
EP0076564B1 EP82304235A EP82304235A EP0076564B1 EP 0076564 B1 EP0076564 B1 EP 0076564B1 EP 82304235 A EP82304235 A EP 82304235A EP 82304235 A EP82304235 A EP 82304235A EP 0076564 B1 EP0076564 B1 EP 0076564B1
Authority
EP
European Patent Office
Prior art keywords
slab
hot top
ribs
slabs
top lining
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.)
Expired
Application number
EP82304235A
Other languages
German (de)
English (en)
Other versions
EP0076564A1 (fr
Inventor
Heinrich Comes
Klaus Friede
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.)
Foseco Trading AG
Original Assignee
Foseco Trading AG
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 Foseco Trading AG filed Critical Foseco Trading AG
Priority to AT82304235T priority Critical patent/ATE13264T1/de
Publication of EP0076564A1 publication Critical patent/EP0076564A1/fr
Application granted granted Critical
Publication of EP0076564B1 publication Critical patent/EP0076564B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • B22D7/106—Configuration of hot tops

Definitions

  • the invention concerns hot tops for metallurgical moulds, in particular for ingot moulds, especially for casting steel.
  • the metal in the head of the mould In casting steel ingots it is desirable to keep the metal in the head of the mould molten whilst the metal in the body of the mould is cooling and solidifying, because the metal in the body of the mould shrinks as it cools and solidifies and, if the head metal is kept molten, the head metal feeds down into the ingot body and achieves the desirable effect of inhibiting the formation of shrinkage cavities in the body of the ingot.
  • the head metal may be kept molten by use of a hot top and this may comprise a number of refractory, heat-insulating articles e.g. slabs positioned as a lining in the head of the mould or in a separate head box at the top of the mould, in the latter case the head metal being within the head box.
  • firebrick Originally hot top linings were commonly of firebrick, usually with a density of about 2 to 3 g/ cm 3 . Firebrick is not a good heat-insulator and for this reason the firebrick linings were thick e.g. 75 mm. However the thick firebrick linings were of high thermal capacity and therefore exerted a marked and undesirable initial chilling effect on the head metal.
  • DE-U-7119091 discloses a hot top lining slab of refractory, heat-insulating material having a plurality of ribs at a vertical end face defining a plurality of recesses.
  • a hot top lining slab of refractory, heat-insulating material having a plurality of ribs at a face of the slab defining a plurality of recesses is characterised in that the refractory, heat-insulating material is slurry-formed, the slab has a density in the range of 0.3 to 0.85 g/cm 3 and an average overall thickness of at least 40 mm and the ribs are at the back i.e. outer face of the slab and define enclosed recesses spaced inwardly from the periphery of the slab.
  • the slabs are positioned with the recessed face outwards i.e. away from the molten metal.
  • the slabs are slurry-formed is a manufacturing convenience and, as part of the thickness of the slabs is accounted for by the ribs, the slabs do not present the dewatering and drying difficulties that would arise if the slabs were of the same overall thickness but did not have the recesses.
  • the great thickness of the slabs enables an excellent heat-insulating effect to be achieved, an effect enhanced by the air in the recesses. Furthermore, good heat-insulating properties are associated with the low density of the slabs. Despite the thickness of the slabs, a very small initial chilling effect is suffered as the material of the slabs is itself of low thermal capacity, a factor associated with the low density of the slabs.
  • the slabs are of low density material coupled with the presence of the recesses means that, despite their thickness, the slabs are not heavy and they can easily be handled. Also, the presence of the ribs serves to increase the mechanical strength of the slabs whilst not greatly increasing their thermal capacity. This combination of properties is especially valuable as the strength of slurry-formed refractory, heat-insulating slabs tends to decrease with a decrease in density.
  • the thick slabs enable the proportion of head metal to be decreased.
  • the average overall thickness of the slabs is at least 50 mm.
  • the ribs preferably account for at least 30%, e.g. about 50%, of the overall thickness of the slab.
  • the ribs preferably define at least three recesses and the total area of the recesses at the outer face of the slab is preferably at least 30% of the total area of the outer surface of the slab.
  • the tapered ribs are preferably at least twice as wide at the base as at the tip.
  • the recesses may be of various shapes preferably generally rectangular.
  • the slabs may be slurry-formed in known manner using known materials and using a former shaped to form the slabs with the ribs and recesses.
  • the ingredients of the slab comprise particulate refractory filler, some at least of which is lightweight e.g. has a bulk density not greater than 0.35 g/cm 3 , a binder and, optionally, organic and/or inorganic fibres.
  • the lightweight filler is one or more of calcined rice husks and expanded minerals, e.g. expanded perlite.
  • the density of the slab is most preferably 0.4 to 0.7 g/ c m3 .
  • An edge of the slab (the lowermost edge in use) is preferably bevelled so that the molten metal contacting face of the slab does not extend downwards as far as the opposite face of the slab.
  • the bevelled edge is generally concave and the concavity is preferably provided by means of a multiple, e.g. double, re-entrant bevel. In this way the abruptness of the resultant shoulder is diminished and the height in the hot top where residual mould flux remains after casting is increased.
  • the thickness of the slab enables the proportion of head metal to be decreased and the features just described help - to maximise the proportion of the head metal that is usable.
  • the ingot mould has walls 1 tapering together upwardly to give an ingot narrower at the top than the bottom, and in the head of the mould is a hot top lining comprising four slurry-formed refractory, heat-insulating slabs 2 having a density of 0.5 g/cm 3 .
  • the slabs 2 are suspended from the top of the mould by conventional means (not shown) and are held firmly in position by four wedges 3 of refractory, heat-insulating material.
  • Each of the slabs 2 has peripheral ribs 4, 5, 6, 7 at its outer face and these ribs together with two outwardly tapering inner ribs 8 define three recesses 9 in the outer face of the slab.
  • the recesses 9 may be vertically disposed in the outer face of slab 2. If desired, the eight-piece assembly illustrated in Figure 2 may be substituted by four, interengaging slabs or a six-piece assembly consisting of four slabs and two wedges.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Liquid Crystal Substances (AREA)
  • Baking, Grill, Roasting (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Road Paving Structures (AREA)
  • Ceramic Products (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Blast Furnaces (AREA)
  • Coating With Molten Metal (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Claims (9)

1. Une plaque (2) de garnissage de masselotte en matériau réfractaire thermo-isolant, dont une face présente une pluralité de nervures (4, 5, 6, 7, 8) définissant une pluralité d'évidements (9), caractérisée en ce que le matériau réfractaire thermoisolant est formé à partir de slurry, en ce que la plaque (2) a une masse spécifique comprise dans la gamme de 0,3 à 0,85 g/cml et une épaisseur totale moyenne d'au moins 40 mm et en ce que les nervures (4,5,6,7,8) sont disposées sur la face arrière de la plaque (2) et définissent entre elles des évidements (9), situés à une certaine distance, vers l'intérieur, de la surface de la plaque (2).
2. Une plaque (2) de garnissage de masselotte suivant la revendication 1 caractérisée en ce que l'épaisseur totale moyenne de la plaque (2) est d'au moins 50 mm.
3. Une plaque (2) de garnissage de masselotte suivant la revendication 1 ou 2, caractérisée en ce que les nervures (4, 5, 6, 7, 8) interviennent pour au moins 30% de l'épaisseur totale de la plaque (2).
4. Une plaque (2) de garnissage de masselotte suivant l'une ou l'autre des revendications précédentes, caractérisée en ce que les nervures (4, 5, 6, 7, 8) définissent au moins trois évidements (9).
5. Une plaque (2) de garnissage de masselotte suivant l'une ou l'autre des revendications précédentes, caractérisée en ce que la surface totale des évidements (9) à la face arrière de la plaque (2) vaut au moins 30% de la superficie totale de la face arrière de la plaque (2).
6. Une plaque (2) de garnissage de masselotte suivant l'une ou l'autre des revendications précédentes, caractérisée en ce qu'au moins une des nervures (8) s'effile vers l'extérieur.
7. Une plaque (2) de garnissage de masselotte suivant la revendication 6, caractérisée en ce qu'au moins la nervure effilée (8) est au moins deux fois plus large à sa base qu'à son sommet.
8. Une plaque (2) de garnissage de masselotte suivant l'une ou l'autre des revendications précédentes, caractérisée en ce que la face frontale est chanfreinée à son arête qui, en service, est située au niveau le plus inférieur.
9. Une plaque (2) de garnissage de masselotte suivant la revendication 8, caractérisée en ce que le chanfrein est un chanfrein multiple rentrant.
EP82304235A 1981-09-23 1982-08-11 Masselottes d'alimentation Expired EP0076564B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82304235T ATE13264T1 (de) 1981-09-23 1982-08-11 Speiser.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8128713 1981-09-23
GB8128713 1981-09-23

Publications (2)

Publication Number Publication Date
EP0076564A1 EP0076564A1 (fr) 1983-04-13
EP0076564B1 true EP0076564B1 (fr) 1985-05-15

Family

ID=10524687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82304235A Expired EP0076564B1 (fr) 1981-09-23 1982-08-11 Masselottes d'alimentation

Country Status (10)

Country Link
EP (1) EP0076564B1 (fr)
KR (1) KR880001957B1 (fr)
AT (1) ATE13264T1 (fr)
AU (1) AU546187B2 (fr)
BR (1) BR8205540A (fr)
DE (1) DE3263540D1 (fr)
ES (1) ES267396Y (fr)
IN (1) IN157313B (fr)
MX (1) MX162784A (fr)
ZA (1) ZA825958B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20108394U1 (de) 2001-05-18 2002-09-26 Keramed Medizintechnik Gmbh Knie-Endoprothese

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1255938A (en) * 1967-12-12 1971-12-01 Aikou Kogyo Kaisha Ltd An improvement in or relating to a heat-resisting and retaining moulding for hot tops
DE7119091U (de) * 1971-05-15 1971-10-28 Continentale Erzgesellschaft Mbh Platte zur auskleidung von kokillenaufsaetzen
GB2077160B (en) * 1980-05-17 1983-10-05 Foseco Int Holding means for hot top lining slabs for ingot moulds

Also Published As

Publication number Publication date
DE3263540D1 (en) 1985-06-20
ES267396U (es) 1983-03-16
EP0076564A1 (fr) 1983-04-13
AU546187B2 (en) 1985-08-22
KR880001957B1 (ko) 1988-10-08
MX162784A (es) 1991-06-26
IN157313B (fr) 1986-03-01
BR8205540A (pt) 1983-08-30
ATE13264T1 (de) 1985-06-15
AU8754182A (en) 1983-03-31
KR840001451A (ko) 1984-05-07
ES267396Y (es) 1983-10-16
ZA825958B (en) 1983-06-29

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