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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22C—FOUNDRY MOULDING
  • B22C23/00—Tools; Devices not mentioned before for moulding
  • B22C23/02—Devices for coating moulds or cores
• • 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

• ABSTRACT OF THE DISCLOSURE Ingot mould bases are protected by a bottom plate dressing applied by placing a heat rupturable bag of the lrquld dressing on the hot base of the mould.
• This invention relates to the treatment of ingot moulds.
• this takes the form of a suspension of refractory particles in water, together with a binder.
• the coating is brushed, sprayed or otherwise applied to the base or bottom plate, and also, if desired, to other parts of the ingot mould interior, and then dried down by evaporation of the liquid vehicle, usually due to residual heat in the mould to give a thin coherent coating which is not wet by the molten metal.
• ingot mould bases or bottom plates may be protected by placing on the base, prior to teeming molten metal into the mould, a quantity of liquid coating composition contained in an easily heat fracturable container.
• a method of preparing in ingot mould which comprises locating, on the hot base of the mould, a quantity of liquid bottom plate coating composition contained in an easily heat-rupturable container, whereby the container ruptures, allows the liquid coating composition to spread to an even thickness and dry to a dry layer, prior to the commencement of teeming molten metal.
• the base of the mould may possess sufficient residual heat from the previous casting cycle to effect the necessary rupture of the container and drying out of the composition; alternatively, it may be preheated.
• the bottom plate coating composition may be any of those known for such use. Particularly preferred are those of the type described in British specification No. 1,128,816, and those described in copending application U.S. Ser. No. 18,702 filed Mar. 11, 1970, now abandoned.
• the quantity of coating material used is preferably that which would give a dry coating of thickness 0.4 to 2.0 mm. on the mould base.
• the preferred heat-rupturable container is a plastics bag, e.g. of polyethylene.
• the invention is of particular value with recessed ingot mould base plates, in which the recess acts to hold a pool of the bottom plate dressing.
• EXAMPLE A polyethylene container having a wall thickness of 50 microns and nominal overall dimensions of 17.5-12.5-5 cms., holds suflicient coating composition to elfect a lining of 1 mm. thickness in the recessed area of a recessed ingot mould base plate.
• the recess has the following dimensions: 20 X 20 cms. and is approximately 10 cms. deep. The sides of the recess are inclined to an angle of 45 from the horizontal plane of the base plate.
• the container In use the container is placed in the recess of the base plate which is at a temperature of 300 C. from a previous casting. The container melts and the composition flows, and spreads evenly over the flat area of the recess and along the inclined walls. After casting it was observed that the ingot stripped cleanly from the base plate. Visual inspection showed that the coating had wholly withstood the erosive action of the molten metal protecting the plate.
• thermorupturable container is a plastic bag.
• a method according to claim 1 wherein the amount of liquid dressing applied is sufiicient to give a dry coatmg of thickness 0.4 to 2.0 mm. on the base of the mould.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Furnace Housings, Linings, Walls, And Ceilings (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)
• Cookers (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=10021811

Family Applications (1)

Country Status (6)

Cited By (3)

Family Cites Families (1)

• 1970
  • 1970-03-19 GB GB03374/70A patent/GB1283618A/en not_active Expired
• 1971
  • 1971-03-04 CA CA106891A patent/CA931322A/en not_active Expired
  • 1971-03-08 US US122094A patent/US3686013A/en not_active Expired - Lifetime
  • 1971-03-17 DE DE19712112782 patent/DE2112782A1/de active Pending
  • 1971-03-19 JP JP46015218A patent/JPS5111045B1/ja active Pending
  • 1971-03-19 FR FR717109720A patent/FR2083425B1/fr not_active Expired

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