EP0054061A1 - Procede de production de moules de coulee ou noyaux solidifies. - Google Patents

Procede de production de moules de coulee ou noyaux solidifies.

Info

Publication number
EP0054061A1
EP0054061A1 EP81901923A EP81901923A EP0054061A1 EP 0054061 A1 EP0054061 A1 EP 0054061A1 EP 81901923 A EP81901923 A EP 81901923A EP 81901923 A EP81901923 A EP 81901923A EP 0054061 A1 EP0054061 A1 EP 0054061A1
Authority
EP
European Patent Office
Prior art keywords
binder
mould
frozen
deep
production
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
EP81901923A
Other languages
German (de)
English (en)
Other versions
EP0054061B1 (fr
Inventor
Emil Jespersen
Bakshi Brijindra Singh
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.)
Dansk Industri Syndikat AS
Dansk Landbrugs Grovvareselskab AMBA
Original Assignee
Dansk Industri Syndikat AS
Dansk Landbrugs Grovvareselskab AMBA
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 Dansk Industri Syndikat AS, Dansk Landbrugs Grovvareselskab AMBA filed Critical Dansk Industri Syndikat AS
Publication of EP0054061A1 publication Critical patent/EP0054061A1/fr
Application granted granted Critical
Publication of EP0054061B1 publication Critical patent/EP0054061B1/fr
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • B22C9/126—Hardening by freezing

Definitions

  • the invention relates to a method of producing frozen casting moulds or cores of a granular material and a binder in a mould chamber or a core box, comprising the use of a freezable binder which is in a gas or liquid state at positive temperatures calculated in oC.
  • Freezing of the added water is by nature a rather slow process, and consequently it takes a relatively long time from the moment when the moulding process is finished until the mould has frozen deep enough to be able to resist the effect of molten metal for a sufficiently long time, and this in turn causes the over all mould production to become considerably more time-consuming than the conventional mould manufacturing processes.
  • the object of the invention is to overcome this drawback of the known embodiments of the present method, and this object is achieved in that the binder has been frozen before the moulding process or is rapidly brought down below its freezing point during said process in that at least one of the tools and/or materials which the binder, which itself may have been precooled, is caused to contact in the moulding process, has been cooled in advance.
  • part or the entire necessary cooling may have been effected in advance, i.e. before the moulding process, so that the molten metal may be poured into the mould immediately after the termination of the moulding process.
  • This provides for such a great production rate that the method may be used in connection with fast working automatic machines for the production of casting moulds with or without cores, e.g. of the type disclosed in the applicants' Danish Patent Specification No. 87462 and Patent Application No. 3501/74 to turn the high operation rate of these machines into account.
  • the mould binder may have been cooled before the mould manufacturing process so that it is present in the form of fine, dendritic particles, e.g. snow, in the mould material, and a compression during the moulding process may entail that the binder obtains part of or its entire binding capacity depending upon the temperature conditions at the time of the mould manufacturing process.
  • the mould binder used may, as stated in claim 4, also havebeen cooled before the mould manufacturing process so that it is present in the form of a finely divided powdered material, e.g. in the mould material, and a compression during the moulding process may entail that the binder obtains part of or its entire binding capacity depending upon the temperature conditions at the time of the mould manufacturing process.
  • the snow or the ice When a suitable mixture of granular material and snow or broken ice is compressed in a mould box, the snow or the ice may thus be caused to bind the grains of the material together to impart a cohesive force to the mould or the core sufficient for it to resist the effect from liquid metal which is poured down into the finished mould with or without cores.
  • a corresponding effect can be achieved by injecting one of the mentioned mixtures of mould material into a core box with a sufficiently great force and at a sufficiently great rate.
  • the precooled binder in the form of pulverized material may, as stated in claim 5, also be combined with liquid gas. This permits the temperature of the mould material to be reduced to a very low value before and during the moulding process and during the. immediately following casting process. The mixture must be homogenous and easy flowing. Actually, there is nothing to prevent the use of conventional setting binders.
  • a binder there may be used water glass and liquid carbon dioxide, as stated in claim 6, or a mixture of polyisocyanate and phenol resin which is activated by precooled, liquid dimethylethyl amine or triethyl amine, as stated in claim 7. This provides for a reduction in the use of an environmentally harmful binder.
  • the granular material used for the formation of the mould or the core may have been deep frozen in advance, as stated in claim 8.
  • the process ingredients may have been deep-frozen in advance by means of an admixed freezing agent, and the freezing agent used may expediently be liquid gas as stated in claim 10.
  • the use of an inert gas, as stated in claim 11, obviates; any risk of chemical attacks on the equipment used for the process or for chemical reactions with the casting metal.
  • the required cooling may also be effected or be supported by deep-freezing the parts of the apparatus which the mould material contacts during the moulding process.
  • the pattern board which contacts the same mould surface as the molten metal does later may have been deep-frozen in advance, as stated in claim 12, and a core box deep-frozen in advance may be used, as stated in claim 13 , in the production of cores.
  • the core box with the core or cores may be cooled simultaneously and additionally, as stated in claim 14 , e . g . with liquid gas .
  • a specific embodiment of the method of the invention in the production of casting moulds comprises the use of deep-frozen disposable patterns of a material which evaporates when heated, as stated in claim 15, and this material may expediently have been deep-frozen and foamed, as stated in claim 16.
  • Such patterns may be produced currently in a particular bifurcate pattern mould box corresponding to a conventional core box and be placed in a closed chamber, following which the space between the pattern and the walls of the chamber is filled with the moulding material which is cooled by the pattern and may additionally have been cooled in advance as mentioned above. After the moulding process is finished the pattern evaporates rapidly owing to the heat received. This obviates the inconvenient development of gas, which otherwise takes place in the moulding of disposable patterns.
  • This embodiment of the method results in particularly accurate castings because the inaccuracies which in the conventional mould manufacturing process result from wear on the pattern board caused by shootings of sand, are avoided. Moreover, bifurcation of the mould box is not required when readily evaporable patterns are used.
  • the invention also relates to a plant for carrying out the disclosed method, said plant comprising apparatus for the production of casting moulds and/or apparatus for the production of cores.
  • the plant of the invention is characterized in that the apparatus or parts of it are contained in a cooling chamber whereby the necessary temperature conditions may be readily and constantly maintained so that valuable production time isnot lost in waiting for cooling.
  • a considerable saving in energy may be achieved by an arrangement such that waste heat from the melting apparatus is used for the operation of the cooling system of the cooling chamber, as stated in the characterizing portion of claim 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Pour produire des moules de coulee ou des boites a noyau solidifies le liant est refroidi jusqu'a obtenir une solidification au moins partielle avant ou pendant le moulage. Ceci permet d'augmenter la cadence de production jusqu'a un niveau tel que la capacite de travail des machines automatiques de production de moules de coulage et de boite a noyau puisse etre totalement utilisee.
EP81901923A 1980-06-23 1981-06-22 Procede de production de moules de coulee ou noyaux solidifies Expired EP0054061B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK2675/80 1980-06-23
DK267580A DK151776C (da) 1980-06-23 1980-06-23 Fremgangsmaade til fremstilling af frosne stoebeforme eller kerner

Publications (2)

Publication Number Publication Date
EP0054061A1 true EP0054061A1 (fr) 1982-06-23
EP0054061B1 EP0054061B1 (fr) 1984-10-03

Family

ID=8114515

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81901923A Expired EP0054061B1 (fr) 1980-06-23 1981-06-22 Procede de production de moules de coulee ou noyaux solidifies

Country Status (13)

Country Link
EP (1) EP0054061B1 (fr)
JP (1) JPH0144424B2 (fr)
BE (1) BE889350A (fr)
CA (1) CA1183320A (fr)
CS (1) CS257755B2 (fr)
DD (1) DD159531A5 (fr)
DK (1) DK151776C (fr)
ES (1) ES8301130A1 (fr)
IT (1) IT1136695B (fr)
PL (1) PL130506B1 (fr)
SU (1) SU1366043A3 (fr)
WO (1) WO1982000015A1 (fr)
ZA (1) ZA814230B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113579161A (zh) * 2021-07-28 2021-11-02 南京航空航天大学 大型复杂冷冻砂型低温成形及超过冷控性协同制造方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2681811A1 (fr) * 1991-09-27 1993-04-02 Air Liquide Procede de fabrication de pieces ouvrees.

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU428843A1 (ru) * 1971-01-04 1974-05-25 Способ изготовления литейных форм замораживанием
US3978906A (en) * 1974-01-29 1976-09-07 Borden, Inc. Process for the rapid production of foundry molds and cores and to a composition for use therein
NO142944L (fr) * 1975-08-14 1900-01-01
JPS592575B2 (ja) * 1978-06-17 1984-01-19 淳策 中島 冷凍鋳型の造型法及びその装置
SU718215A1 (ru) * 1978-09-21 1980-02-29 Предприятие П/Я А-3470 Способ изготовлени замороженных форм
JPS5548452A (en) * 1978-09-29 1980-04-07 Ishikawa Chuzosho:Kk Manufacture of mold
PL124538B1 (en) * 1979-02-16 1983-01-31 Inst Odlewnictwa Method of making foundry moulds and cores
DE2909839A1 (de) * 1979-03-13 1980-09-25 Linde Ag Verfahren zum herstellen einer giessform
DE2912201A1 (de) * 1979-03-28 1980-10-09 Linde Ag Verfahren zum herstellen einer giessform
PL124680B1 (en) * 1979-09-27 1983-02-28 Inst Odlewnictwa Apparatus for making casting moulds and cores
PL124681B1 (en) * 1980-05-12 1983-02-28 Odlewniczych Fab Mas Method of and apparatus for making casting moulds

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8200015A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113579161A (zh) * 2021-07-28 2021-11-02 南京航空航天大学 大型复杂冷冻砂型低温成形及超过冷控性协同制造方法

Also Published As

Publication number Publication date
ES503284A0 (es) 1982-11-16
EP0054061B1 (fr) 1984-10-03
JPH0144424B2 (fr) 1989-09-27
CA1183320A (fr) 1985-03-05
CS257755B2 (en) 1988-06-15
DK151776C (da) 1988-08-15
BE889350A (fr) 1981-12-23
PL231819A1 (fr) 1982-02-15
IT1136695B (it) 1986-09-03
WO1982000015A1 (fr) 1982-01-07
PL130506B1 (en) 1984-08-31
DK267580A (da) 1981-12-24
ZA814230B (en) 1982-04-28
DK151776B (da) 1988-01-04
IT8122460A0 (it) 1981-06-19
JPS57500819A (fr) 1982-05-13
DD159531A5 (de) 1983-03-16
SU1366043A3 (ru) 1988-01-07
ES8301130A1 (es) 1982-11-16

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