EP0005993A2 - Masse de revêtement avec solvant volatil pour usage en fonderie - Google Patents

Masse de revêtement avec solvant volatil pour usage en fonderie Download PDF

Info

Publication number
EP0005993A2
EP0005993A2 EP79300985A EP79300985A EP0005993A2 EP 0005993 A2 EP0005993 A2 EP 0005993A2 EP 79300985 A EP79300985 A EP 79300985A EP 79300985 A EP79300985 A EP 79300985A EP 0005993 A2 EP0005993 A2 EP 0005993A2
Authority
EP
European Patent Office
Prior art keywords
flash
dressing
dressings
foundry practice
mixtures
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.)
Granted
Application number
EP79300985A
Other languages
German (de)
English (en)
Other versions
EP0005993B1 (fr
EP0005993A3 (en
Inventor
Dennis Roger Clarke
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.)
BP Chemicals Ltd
Original Assignee
BP Chemicals 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 BP Chemicals Ltd filed Critical BP Chemicals Ltd
Publication of EP0005993A2 publication Critical patent/EP0005993A2/fr
Publication of EP0005993A3 publication Critical patent/EP0005993A3/en
Application granted granted Critical
Publication of EP0005993B1 publication Critical patent/EP0005993B1/fr
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns

Definitions

  • the present invention relates to the use of flash dressings in foundry practice.
  • porous moulds and cores It is conventional to coat porous moulds and cores with a dressing which serves as a barrier between molten metal and eg the sand in the casting process. By its use, a number of other casting defects are prevented.
  • a dressing in the form of a water-based coating by brush, swab or spray gun.
  • Such water-based coatings may comprise a base or filler and a liquid vehicle.
  • the filler may be carbonaceous, graphitic, or based on a mineral flour such as zircon.
  • the dressing is normally bonded by a clay-based binder.
  • suspension agents such as bentonite may be added to prevent the settling out of heavy fillers during use.
  • Other minor components such as iron- oxide may be added to mould coatings to assist in preventing reaction between nitrogen-containing bonding agents and molten ferrous metals. This latter reaction is usually responsible for defects such as "pinholing" under the casting surface.
  • Smoke supressants such as for example ferrocene may also be added to the flash dressing compositions.
  • addition of a minor proportion, eg up to 20% by volume of the total composition, of a liquid hydrocarbon aids. not only to burn off completely-the flash dressing applied to the casting but also enhances the luminosity of the flames. This is desirable in some instances to ensure that the flash dressing has in fact been ignited.
  • the amount of liquid hydrocarbon is suitably not more than 15%, preferably not more than 10% by volume of the total composition.
  • the flash dressings of the present invention may be brushed, sprayed or swabbed onto the mould surface. Where small cores are being dressed, the components may be dipped into the liquid dressing suspension.
  • the mould After application, the mould is ignited, leaving behind a film on the surface of the sand, and when the casting has been made, the sand core can then be broken away easily leaving a smooth surface on the casting.
  • the invention is further illustrated with reference to the following tests the results of which are tabulated below.
  • the results in Table 1 are Comparative Tests not according to the invention.
  • the results in Table 2 illustrate the present invention.
  • the dressing may contain in addition 1-2% by weight of a natural or synthetic resin such as a phenol-formaldehyde resin.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
EP19790300985 1978-06-07 1979-05-30 Masse de revêtement avec solvant volatil pour usage en fonderie Expired EP0005993B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2645378 1978-06-07
GB7826453 1978-06-07

Publications (3)

Publication Number Publication Date
EP0005993A2 true EP0005993A2 (fr) 1979-12-12
EP0005993A3 EP0005993A3 (en) 1980-01-09
EP0005993B1 EP0005993B1 (fr) 1982-04-14

Family

ID=10497883

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790300985 Expired EP0005993B1 (fr) 1978-06-07 1979-05-30 Masse de revêtement avec solvant volatil pour usage en fonderie

Country Status (2)

Country Link
EP (1) EP0005993B1 (fr)
DE (1) DE2962505D1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB930391A (en) * 1960-04-20 1963-07-03 Shigeyuki Okazaki Improvements in a casting method of producing metal ingots having homogeneous and smooth surfaces
US3211560A (en) * 1961-12-18 1965-10-12 Caterpillar Tractor Co Mold wash composition and casting mold coated therewith
FR2165771A1 (en) * 1971-12-30 1973-08-10 Mitsubishi Heavy Ind Ltd Sand mould coating - contg chromium oxide to reduce metal impregnation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB930391A (en) * 1960-04-20 1963-07-03 Shigeyuki Okazaki Improvements in a casting method of producing metal ingots having homogeneous and smooth surfaces
US3211560A (en) * 1961-12-18 1965-10-12 Caterpillar Tractor Co Mold wash composition and casting mold coated therewith
FR2165771A1 (en) * 1971-12-30 1973-08-10 Mitsubishi Heavy Ind Ltd Sand mould coating - contg chromium oxide to reduce metal impregnation

Also Published As

Publication number Publication date
DE2962505D1 (en) 1982-05-27
EP0005993B1 (fr) 1982-04-14
EP0005993A3 (en) 1980-01-09

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