EP0344225B1 - Verfahren zur herstellung einer giessform - Google Patents

Verfahren zur herstellung einer giessform Download PDF

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Publication number
EP0344225B1
EP0344225B1 EP88907601A EP88907601A EP0344225B1 EP 0344225 B1 EP0344225 B1 EP 0344225B1 EP 88907601 A EP88907601 A EP 88907601A EP 88907601 A EP88907601 A EP 88907601A EP 0344225 B1 EP0344225 B1 EP 0344225B1
Authority
EP
European Patent Office
Prior art keywords
material mixture
casting
water
moulding material
casting mould
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
EP88907601A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0344225A1 (de
Inventor
Ludwig Wilhelm
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.)
Georg Fischer AG
Original Assignee
Georg Fischer 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 Georg Fischer AG filed Critical Georg Fischer AG
Publication of EP0344225A1 publication Critical patent/EP0344225A1/de
Application granted granted Critical
Publication of EP0344225B1 publication Critical patent/EP0344225B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/162—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents use of a gaseous treating agent for hardening the binder
    • 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

Definitions

  • the invention relates to a method for producing a casting mold in the manner of a block mold from a granular molding material mixture for pouring preferably coreless castings, a molding material mixture containing quartz sand and a predetermined amount of water glass being introduced into a molding box containing the model and the molding material mixture being introduced during a certain time with CO2 gas is applied.
  • the known molding processes such as Shaking, pressing, blowing, shooting or high pressure pressing have in common that molding materials with additives such as e.g. Bentonite can be used. Since the old sand accumulated when the castings are emptied is reused and must therefore be processed accordingly, any type of additive in the molding material - for the process of reprocessing - is problematic.
  • a method of the type mentioned is known from GB-A-745 402. According to this, in order to shorten the hardening time or to accelerate the removal of water, a water-soluble, emulsifiable or saponifiable substance, which serves to bind the water formed during hardening, is additionally added to the molding material mixture. This addition of this substance can increase the strength of the casting mold in accordance with the removal of water, which, however, is only comparatively small.
  • FR-A-1 322 512 is also next to quartz sand only used as a binder water glass in casting mold manufacture, however, no CO2 exposure is intended here, but only a heat exposure by dielectric high-frequency exposure by practically insulating, ie made of plastic, the green mold-containing mold boxes are guided between two capacitor plates connected to a high-frequency generator.
  • the object of the present invention is to propose a method for producing a casting mold from a granular molding material mixture, in which there are no reactive additives to the liquid metal.
  • the casting mold produced by the process should be environmentally friendly and easy to process.
  • quartz sand is first mixed with water glass, the water glass serving as a binder. Fumigation with carbonic acid rapidly solidifies the molding material. Silica gels are formed with the elimination of water, which firmly bind the quartz sand.
  • the bonding introduced by the carbon dioxide allows the mold to be separated from the model without damage.
  • the pourable final hardness is adjusted by exposure to microwaves.
  • a casting mold 1 according to the invention has molded parts 2 and 3 modeled on both sides with cavities already molded. Several such molds are produced for series production, two of them each be pushed together in a block so that a complete casting cavity is created. This not only brings optimal use of the shape, but also leads to economical series production.
  • Directional solidification can be achieved by providing cooling bores 4 which can be supplied with air as the cooling medium.
  • Sand with the designation M36 and 5% was used for the mold production.
  • Water glass e.g. Kernex
  • the molds were placed in the microwave oven. The oven was operated at a power level corresponding to an energy output of about 700 watts for 5 minutes. Loss of water has increased the dimensional stability.
  • the mold After the casting and solidification of the metal in the mold, the mold can be dissolved in water. The castings are then cleaned by blasting. The lowering of the mold in the water can be carried out in various stages, which means that a change in the structure of the casting can be avoided or set in a targeted manner.
  • the sand detached in the water is fed to the reprocessing after drying, whereby this reprocessing can be carried out in an environmentally friendly process without additional manipulations, since no additives are used, e.g. Bentonite, coal dust or other additives.
  • the casting mold produced in the proposed manner has a very high strength, there is no feeder for gray-rigid materials.
  • the cast body cast in this form has a good surface due to the low penetration.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP88907601A 1987-09-18 1988-09-15 Verfahren zur herstellung einer giessform Expired - Lifetime EP0344225B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH3608/87 1987-09-18
CH3608/87A CH675973A5 (enrdf_load_stackoverflow) 1987-09-18 1987-09-18
PCT/CH1988/000161 WO1989002325A1 (en) 1987-09-18 1988-09-15 Process for manufacturing a casting mould

Publications (2)

Publication Number Publication Date
EP0344225A1 EP0344225A1 (de) 1989-12-06
EP0344225B1 true EP0344225B1 (de) 1994-08-17

Family

ID=4259648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88907601A Expired - Lifetime EP0344225B1 (de) 1987-09-18 1988-09-15 Verfahren zur herstellung einer giessform

Country Status (6)

Country Link
EP (1) EP0344225B1 (enrdf_load_stackoverflow)
JP (1) JPH02501204A (enrdf_load_stackoverflow)
AT (1) ATE110016T1 (enrdf_load_stackoverflow)
CH (1) CH675973A5 (enrdf_load_stackoverflow)
DE (1) DE3851143D1 (enrdf_load_stackoverflow)
WO (1) WO1989002325A1 (enrdf_load_stackoverflow)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB745402A (en) * 1952-07-09 1956-02-22 Wilhelm Schmidt Improvements in or relating to a process for the production of moulds and cores for foundry purposes
DE1030525B (de) * 1952-11-13 1958-05-22 Gutehoffnungshuette Sterkrade Verfahren zur Herstellung von Formmasken
FR1322512A (fr) * 1962-05-02 1963-03-29 Siemens Ag Procédé et dispositif de construction de moules et noyaux de fonderie à dimensions stables à partir de sables de moulage et de liants
FR1517167A (fr) * 1967-03-09 1968-03-15 Usines Belges Vynckier Freres Procédé de durcissement d'une composition à base de sable et installation pour lamise en oeuvre de ce procédé
JPS58100938A (ja) * 1981-12-11 1983-06-15 Sintokogio Ltd 鋳型造型方法

Also Published As

Publication number Publication date
WO1989002325A1 (en) 1989-03-23
CH675973A5 (enrdf_load_stackoverflow) 1990-11-30
EP0344225A1 (de) 1989-12-06
ATE110016T1 (de) 1994-09-15
JPH02501204A (ja) 1990-04-26
DE3851143D1 (de) 1994-09-22

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