US3807684A - Mold stool - Google Patents

Mold stool Download PDF

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Publication number
US3807684A
US3807684A US00325417A US32541773A US3807684A US 3807684 A US3807684 A US 3807684A US 00325417 A US00325417 A US 00325417A US 32541773 A US32541773 A US 32541773A US 3807684 A US3807684 A US 3807684A
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US
United States
Prior art keywords
percent
weight
insert
mold
stool
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 - Lifetime
Application number
US00325417A
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English (en)
Inventor
T Kurihara
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.)
Nippon Crucible Co Ltd
Original Assignee
Nippon Crucible Co Ltd
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 Nippon Crucible Co Ltd filed Critical Nippon Crucible Co Ltd
Application granted granted Critical
Publication of US3807684A publication Critical patent/US3807684A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D7/062—Stools for ingot moulds

Definitions

  • the ingot mold of top pouring type is generally used, in which a cast iron ingot case is rested on a flat cast iron plate so .called stool with its bottom 1 of ingot metal to the stool, so that severe and costly operations are required to separate them. Moreover, the life of the stools may be decreased by such severe separating operations.
  • refractory material such as fused silica.
  • this method is not satisfactory for protecting large size stools, and can be used only for casting small size ingots of less than about tons.
  • electrode graphite which has a high enough thermal conductivity, has also been proposed for the insert. However, they are not usefull as being worn rapidly by oxidation.
  • a main object of the present invention is to provide a suitable material for the insert, having necessary strength, anti-spalling and -oxidation charac- Another object of the present invention is to provide a suitable material and constructions to join the inserts to the stools.
  • the material is made mainly of natural graphite, sili- 0 con carbide and silica, bonded together with organic binder such as tar, andcomprises 30 50 percentby weight of carbon and graphite, 30 50 percent by weight of silicon carbide and 5- 20 percent by weight of silicon oxide.
  • Inserts of higher thermal conductivity may be mainly obtained from groups of higher graphite content.
  • groups of higher graphite content a small amount of iron oxideand zirconium oxide may be added to increase strength.
  • the inserts of the present invention have shown excellent results in the practical performances.
  • FIG. 1 is a sectional view of the ingot mold embodying the present invention.
  • FIG. 2 is a plan view of the mold shown in FIG. 1.
  • the top pouring type ingot mold 1 includes cast iron ingot caseZ'rested upon cast iron stool 3.
  • a circular hollow 4 is formed about thecenter of the surface of stool 3, and an insert 5 of circular plate form is fitted therein and secured firmly with joint material 6 of the composition aforementioned.
  • a thin layer 7 of refractory powder, preferably the powder components of the joint material, is placed on the bottom surface of hollow 4 as a .cushon.
  • the joint material 6 should be dried thoroughly after being applied. Any suitable form may be employed for insert 5 and corresponding hollow .4 other than circular.
  • the upper surface of insert 5, which is to be exposed to molten metal is about 15 4O of the mold bottom area in case of producing large size steel ingot weighing '10 tons or over. For small size ingot of less than l tons, 100 percent would be better.
  • the surface of insert is lowered slightly from the surface level of stool 3 about 30 50 mm according to the size of ingot so as to prevent splashing by providing a pool under the falling molten metal at the beginning of the pouring operations, as well as to facilitate the provision of a support on the bottom of the ingot which may be used conveniently for the subsequent operations.
  • annular or spiral grooves 8 and 9 are provided on the opposed vertical surfaces of hollow 4 and insert 5 respectively, preferably at the lower half of the insert. Joint material 6 filled within grooves 8 and 9 may hold insert 5 securely by its wedge action.
  • the stools could withstand more than 80 times of usage without showing any appreciable defect. No appreciable defect was observed also within the ingot metal.
  • a mold of the top pouring type in which an ingot case is received on a stool for casting a steel ingot in which said stool has an insert fixed within a hollow provided on the upper surface thereof substantially at the center thereof, the improvement in which said insert is made essentially of carbon-bonded-silicon carbidegraphite refractory material having thermal conductivity within a range of 20 3O Kcal/mhrC.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Products (AREA)
  • Mold Materials And Core Materials (AREA)
US00325417A 1972-12-14 1973-01-22 Mold stool Expired - Lifetime US3807684A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5770672A GB1391638A (en) 1972-12-14 1972-12-14 Mould stool

Publications (1)

Publication Number Publication Date
US3807684A true US3807684A (en) 1974-04-30

Family

ID=10479851

Family Applications (1)

Application Number Title Priority Date Filing Date
US00325417A Expired - Lifetime US3807684A (en) 1972-12-14 1973-01-22 Mold stool

Country Status (9)

Country Link
US (1) US3807684A (it)
AU (1) AU470217B2 (it)
BE (1) BE808612A (it)
BR (1) BR7309846D0 (it)
ES (1) ES421730A1 (it)
FR (1) FR2327003A1 (it)
GB (1) GB1391638A (it)
IT (1) IT1000853B (it)
NL (1) NL7317093A (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918624A (en) * 1974-06-06 1975-11-11 Nippon Rutsubo Kabushiki Kaish Method and device for fixing an insert to a mold stool
US4005846A (en) * 1975-11-19 1977-02-01 Nalco Chemical Company Ingot mold base member

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2170555A (en) * 1937-09-03 1939-08-22 Whitacre Greer Fireproofing Co Ingot mold plug
US3682435A (en) * 1964-06-22 1972-08-08 Sandivkens Jernveks Ab Bottom brick for ingot molds

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2170555A (en) * 1937-09-03 1939-08-22 Whitacre Greer Fireproofing Co Ingot mold plug
US3682435A (en) * 1964-06-22 1972-08-08 Sandivkens Jernveks Ab Bottom brick for ingot molds

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Black, Graphite Stool Inserts for B End Down Molds, Iron and Steel Engineer, Sept. 1949, pp. 140 142. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918624A (en) * 1974-06-06 1975-11-11 Nippon Rutsubo Kabushiki Kaish Method and device for fixing an insert to a mold stool
US4005846A (en) * 1975-11-19 1977-02-01 Nalco Chemical Company Ingot mold base member
US4077600A (en) * 1975-11-19 1978-03-07 Nalco Chemical Company Ingot mold base member

Also Published As

Publication number Publication date
FR2327003A1 (fr) 1977-05-06
IT1000853B (it) 1976-04-10
BE808612A (fr) 1974-03-29
NL7317093A (it) 1974-06-18
FR2327003B1 (it) 1978-03-24
IT7303008A1 (it) 1975-06-14
AU6346573A (en) 1975-06-12
ES421730A1 (es) 1976-04-01
AU470217B2 (en) 1976-03-04
GB1391638A (en) 1975-04-23
BR7309846D0 (pt) 1974-08-15

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