US3804641A - Method of producing foundry moulds and cores - Google Patents

Method of producing foundry moulds and cores Download PDF

Info

Publication number
US3804641A
US3804641A US00243066A US24306672A US3804641A US 3804641 A US3804641 A US 3804641A US 00243066 A US00243066 A US 00243066A US 24306672 A US24306672 A US 24306672A US 3804641 A US3804641 A US 3804641A
Authority
US
United States
Prior art keywords
mixture
cores
moulds
weight
moulding
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
US00243066A
Inventor
V Bortnik
I Korenbljum
N Kagan
J Razumeev
Z Usuboy
V Kuznetsov
A Lyass
P Borsuk
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US00243066A priority Critical patent/US3804641A/en
Application granted granted Critical
Publication of US3804641A publication Critical patent/US3804641A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • 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
    • B22C1/18—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 of inorganic agents

Definitions

  • ABSTRACT A method of producing foundry moulds and cores comprising the steps of preparing a mixture containing a moulding sand, an ingredient chosen from the group which consists of ligno sulphonate of an alkali, alkaliearth metal, ammonium and their mixture as a binder, a material containing aluminate of an alkali metal as a hardener and water, making moulds and cores from said mixture and weathering to harden.
  • the material containing aluminate of an alkali metal is an intermediate product obtainable in the production of aluminum oxide from bauxite or nepheline ores.
  • the foundry moulds and cores can be manufactured of a fluid moulding mixture containing a foaming agent apart from said ingredients.
  • the mixture can also contain a water-binding addition, such as cement or carbamide.
  • the present invention relates to the field of foundry work and more particularly to a method of producing foundry moulds and cores by using a self-hardening moulding sand or mixture.
  • a method comprising the production of cores and moulds from a self-hardening moulding sand containing ground refractory material, ligno sulphonate of an alkali, alkaliearth metal, ammonium or their mixture, cement and an acid liquor resulting from pyrolysis of wood pulp at gas producing plants.
  • a foaming agent was added to the above sand (see, for p Swedish Ba t, No. 323,476, C]. 31b 16).
  • Commonly known also is a method of making foundry moulds and cores of a moulding sand containing ground refractory material, ligno sulphonate of an alkali, alkali-earth metal, ammonium or their mixture as a binder, a compound of hexavalent chromium as a hardener, a foaming agent and water.
  • the compound of hexavalent chromium employed as the hardener being toxical, some caution is necessary in the use of this hardener.
  • the principal object of this invention is to provide such a method of producing foundry moulds and cores of a self-hardening sand, which will ensure substantial enhancement of both mechanical-and-physical properties of said moulds and cores and of their hardening rate. Besides, it would be preferable to avoid the packing operation in making foundry moulds and cores.
  • this is achieved by the fact that in preparing a mixture containing moulding sand, ligno sulphonate of an alkali, alkali-earth metal, ammonium or their mixture as a binder, a material containing alkali metal aluminate is employed as a hardener.
  • the foundry moulds and cores produced thereof Due to the reaction between ligno sulphonate and aluminate of an alkali metal, the foundry moulds and cores produced thereof feature high strength, the hardening process being effected at a perceptibly higher rate.
  • the alkali metal aluminate amounting is useful to employ to within 0.5-5.0 percent of the weight of the moulding sand. This will ensure the maximum possible strength of the foundry moulds and cores produced thereof. Sound practice would be to choose a sodium-aluminate-containing material for that purpose, the materials being most commonly used in the industry.
  • an intermediate product obtained in the production of aluminium oxide from bauxite or nepheline ores would be preferable for use as the material containing an alkali metal aluminate.
  • the above product is produced by sintering bauxite or nepheline ores mixed with sodium carbonate and limestone at a temperature of 1,200 C.
  • the resulting product hereinafter referred to in the description as accordingly a bauxite sinter or a nepheline sinter is cooled and ground to grain size of 0.3-1 mm.
  • both the mixture strength and its hardening rate depends on the amount of sodium aluminate contained therein. Naturally the higher the content of sodium aluminate in said sinters, the higher are the strength and hardening rate of the moulding mixture.
  • the quantity of the sinter which should be introduced into the mixture in order to secure the requisite strength and hardening rate of the moulds and cores ranges from 3 to 10 parts by weight to provide the sodium aluminate content of 0.5 to 5 percent respectively of the moulding sand weight.
  • ligno sulphonate of an alkali, alkali-earth metal, ammonium or their mixture is employed as a binder.
  • the most widely known material containing sodium, calcium, ammonium ligno sulphonate or their mixture is the waste product resulting from the production of cellulose from wood pulp by the sulphite process.
  • the product will be referred to as a sulphite alcohol waste liquor.
  • the sulphite alcohol waste liquor employed in the moulding mixture in accordance with the invention comes from the industry either in a liquid form or in the form of dry concentrates, the ligno sulphonate content varying from 45 to 97 percent by weight.
  • the ligno sulphonate content in the liquid sulphite alcohol waste liquor may be characterized by its specific gravity.
  • the moulding mixture contains commonly an aqueous solution of the sulphite alcohol waste liquor of aspecific gravity of 1.10-1.27 g/cm, the ligno sulphonate content of the solution ranging from 25 to 55 percent by weight which corresponds to its content in the mixture of from 1 to 5 percent of the weight of the moulding sand.
  • Cited below are exemplary embodiments of this invention in which the sulphite alcohol waste liquor is nate of an alkali, alkali-earth metal, ammonium or their mixture in accordance with the invention, is of particular importance for fluidmoulding sands which, apart fror n the moulding sand, said ligno s ulphonate and the Chemical composition, by weight Sinter SiO Ano Fe,O CaO Na,0
  • Nepheline sinter 70-80 10-25 2-8 EXAMPLE 1 100 parts by weight of quartz sand are mixed for 2 1.5-2.0 min. with 4.0 parts by weight of a sulphite alcohol waste liquor of a specific gravity of 1.24-1.26 g/cm containing accordingly 48-52 percent by weight of ligno sulphonate, and tempered with 2.0 parts by weight of water. Then 2.5 parts by weight of a bauxite sinter and 40 percent by weight of sodium aluminate are added to the mixture and stirring is continued for 0.5-2.0 min.
  • the mixture being charged in a core or moulding box, a mould or a core is produced in a conventional manner. Next the mould or the core is left to harden in air.
  • the compression strength (kg/cm of the moulding sand amounts to:
  • the strength of the moulds and cores produced thereof can be improved by introducing a known addition into the hardener to bind water in the mixture.
  • loam loam, bentonite, cement or gypsum to be introduced in amounts ranging from 0.5 to 5 percent of the weight of the moulding mixture.
  • EXAMPLE 2 100 parts by weight of quartz sand are mixed for 1-2 min. with 4.0 parts by weight of a sulphite alcohol waste liquor of a specific gravity of 1.24-1.26 g/cm containing accordingly 48-52 percent by weight of ligno sulphonate, and with 2.0 parts by weight of water. Then 2.5 parts by weight ofa bauxite sinter, containing A method of hardening the binder ligno sulphomaterial containing alkali metal aluminate, include a foaming agent introduced in the mixture in quantities large enough to pass the mixture to a fluid state.
  • the amount of the foaming agent ranges within 0.4-1 percent of the weight of the moulding sand.
  • the foaming agents added to the moulding mixture may constitute anion, cation and nonionogenic surfaceactive materials. These may be alkyl aryl sulphonates, alkyl sulphonates, primary and secondary alkyl sulphates, the products of oxyethylation of alcohols, phenols, amines, quaternary ammonium compounds of long-chain fatty amines.
  • the most suitable foaming agent is an anion-type surface-active compound, such as sodium alkyl aryl sulphonate ensuring the production of a fluid moulding mixture featuring high flowability and the requisite foam stability in the mixture, i.e., the property to retain mobility during the length of time needed to pour the mixture into core and moulding boxes.
  • An advantage of the fluid moulding sand is its high flowability by which virtue the conventional sand compacting technique can be dropped to be replaced by pouring the sand into the core boxes and on patterns during the production of the moulds and cores.
  • ligno sulphonate of an alkali, alkali-earth metal, ammonium or their mixture employed according to the invention in the manufacture of moulds and cores as a binder possesses some foaming capacity, being thereby capable of imparting the mixture a better flowability when it is subjected to intense stirring during preparation.
  • the fluid moulding mixture is especially simple in production.
  • a fluid mixture can be prepared by mixing parts by weight of quartz sand, 4.0 parts by weight of a sulphite alcohol waste liquor of a specific gravity of within 1 hr. after manufacture within 3 hrs. after manufacture within 24 hrs. after manufacture
  • the overall strength of the cores can be increased by carbamide introduced into the moulding mixture.
  • EXAMPLE 4 100 parts by weight of quartz sand are mixed with 4.0 parts by weight of a sulphite alcohol waste liquor of a specific gravity of 1.24-1.26 g/cm containing accordingly 48-52 percent by weight of ligno sulphonate, the liquor being preliminarily tempered with 1.0 parts by weight of water in which 0.8 parts by weight of powdered carbamide were dissolved.
  • the moulds and cores made from said mixture featured the following compression strength (kg/cm ufter air hardening for l hr. after air hardening for 3 hrs. after air hardening for 24 hrs.
  • Example 4 incur position disclosed in Example 4 are 0.6 parts by weight of a foaming agent sodium alkyl aryl sulphonate. After the moulding mixture has passed to the fluid state 2.5 parts of a hardening agent a bauxite sinter, containing 40% by weight of sodium aluminate are introduced into the sand.
  • Said moulding mixture ensures the following compression strength (kglcm of the moulds and cores produced thereof:
  • An important merit of the present invention consists in that the strength of foundry moulds and cores will feature a l.5-2-fold increase along with a two-fold increase in the hardening rates.
  • Peculiar to the cores produced in accordance with the invention is good knockout.
  • a method of producing foundry moulds and cores comprising the steps of preparing a mixture containing parts by weight of moulding sand, from 1 to 5 parts by weight of an ingredient selected from the group which consists of ligno sulphonates: of an alkali, alkaliearth metal, ammonium and their mixture as a binder, and from 3 to 10 parts by weight of a material containing alkali metal aluminate making moulds and cores from said mixture and holding it for air hardening.

Abstract

A method of producing foundry moulds and cores comprising the steps of preparing a mixture containing a moulding sand, an ingredient chosen from the group which consists of ligno sulphonate of an alkali, alkali-earth metal, ammonium and their mixture as a binder, a material containing aluminate of an alkali metal as a hardener and water, making moulds and cores from said mixture and weathering to harden. The material containing aluminate of an alkali metal is an intermediate product obtainable in the production of aluminum oxide from bauxite or nepheline ores. According to the invention the foundry moulds and cores can be manufactured of a fluid moulding mixture containing a foaming agent apart from said ingredients. To enhance the strength of the moulds and cores the mixture can also contain a water-binding addition, such as cement or carbamide.

Description

United States Patent [191 Lyass et al.
[ 5] Apr. 16, 1974 METHOD OF PRODUCING FOUNDRY MOULDS AND CORES [76] Inventors: Abram Moiseevich Lyass,
Sharikopodshipnikovskaya ulitsa, 2, kv. 146; Pavel Atanasievich Borsuk, Nizhne-Pervomaiskaya ulitsa, 59, kv. 10; Zokhrab Gamid Ogly Usubov, B. Cherkizovskaya ulitsa, kvartal 8-11, korpus 21, kv. 106; Viktor Georgievich Kuznetsov, 5 Kozhukhovskaya ulitsa, 10, kv. 36; Naum Yakovlevich Kagan, 2 ulitsa Mariinoi roschi, 14v, kv. 22, all of Moscow; Jury Alexeevich Razumeev, ulitsa Kolontsova, 7, kv. 6, Mytischi Moskovskoi Oblasti; Vladimir Mironovich Bortnik, Eiskaya ulitsa, 9, kv. 26; Isai Volfovich Korenbljum, Veernaya ulitsa, 3, korpus 4, kv. 112, both of 9 Moscow, all of U.S.S.R.
[22] Filed: Apr. 11, 1972 [21] Appl. No.: 243,066
[52] U.S. Cl. 106/382, 106/3835, 106/38.5 R, 106/69 [51] Int. Cl B28b 7/34 [58] Field of Search 106/3835, 38.3, 38.5 R, 106/389, 38.2, 69
[5 6] References Cited UNITED STATES PATENTS 3,032,425 5/1962 Leach 106/389 1/1969 Liass et a1. 106/3835 FOREIGN PATENTS OR APPLICATIONS.
573,171 11/1945 Great Britain 710,099 6/ 1954 Great Britain 714,728 9/1954 Great Britain Primary Examiner-Lorenzo B. Hayes Attorney, Agent, or Firm-Holman & Stern [5 7] ABSTRACT A method of producing foundry moulds and cores comprising the steps of preparing a mixture containing a moulding sand, an ingredient chosen from the group which consists of ligno sulphonate of an alkali, alkaliearth metal, ammonium and their mixture as a binder, a material containing aluminate of an alkali metal as a hardener and water, making moulds and cores from said mixture and weathering to harden. The material containing aluminate of an alkali metal is an intermediate product obtainable in the production of aluminum oxide from bauxite or nepheline ores. According to the invention the foundry moulds and cores can be manufactured of a fluid moulding mixture containing a foaming agent apart from said ingredients. To enhance the strength of the moulds and cores the mixture can also contain a water-binding addition, such as cement or carbamide.
5 Claims, No Drawings METHOD OF PRODUCING FOUNDRY MOULDS AND CORES The present invention relates to the field of foundry work and more particularly to a method of producing foundry moulds and cores by using a self-hardening moulding sand or mixture.
Well known is a method of producing moulds and cores from a moulding mixture containing moulding sand, sodium silicate and dicalcium silicate. Hardening of this mixture is due to interaction between sodium and dicalcium silicates which results in manufacturing strong cores and moulds (see, for example, French Pat. No. 1,342,529). This prior-art method proves successful in practice though it presents some problems, such as: more difficult decoring of castings, friability of hardened moulds and cores and difficulties related to hardening rate control.
To overcome these problems a method was devised comprising the production of cores and moulds from a self-hardening moulding sand containing ground refractory material, ligno sulphonate of an alkali, alkaliearth metal, ammonium or their mixture, cement and an acid liquor resulting from pyrolysis of wood pulp at gas producing plants. For producing a fluidmixture a foaming agent was added to the above sand (see, for p Swedish Ba t, No. 323,476, C]. 31b 16).
However, this method also presents some difficulties,
such as comparatively low hardening rates .of the moulds and cores produced thereof (the hardening process lasts for 5-12 hours) and low strength which does not exceed 0.6 kg/cm within 1 hr after their production.
Commonly known also is a method of making foundry moulds and cores of a moulding sand containing ground refractory material, ligno sulphonate of an alkali, alkali-earth metal, ammonium or their mixture as a binder, a compound of hexavalent chromium as a hardener, a foaming agent and water.
The problems associated with the above method are attributed in the first place to low gas permeability of the moulds and cores produced by the above technique necessitating thereby drying at a l50-200 C temperature for 1.5-2 hrs.
Moreover, the compound of hexavalent chromium employed as the hardener being toxical, some caution is necessary in the use of this hardener.
It is an object of the present invention to overcome or at least to diminish the above difficulties.
The principal object of this invention is to provide such a method of producing foundry moulds and cores of a self-hardening sand, which will ensure substantial enhancement of both mechanical-and-physical properties of said moulds and cores and of their hardening rate. Besides, it would be preferable to avoid the packing operation in making foundry moulds and cores.
According to the invention, this is achieved by the fact that in preparing a mixture containing moulding sand, ligno sulphonate of an alkali, alkali-earth metal, ammonium or their mixture as a binder, a material containing alkali metal aluminate is employed as a hardener.
Due to the reaction between ligno sulphonate and aluminate of an alkali metal, the foundry moulds and cores produced thereof feature high strength, the hardening process being effected at a perceptibly higher rate.
In a preferred embodiment of the present invention it is useful to employ the alkali metal aluminate amounting to within 0.5-5.0 percent of the weight of the moulding sand. This will ensure the maximum possible strength of the foundry moulds and cores produced thereof. Sound practice would be to choose a sodium-aluminate-containing material for that purpose, the materials being most commonly used in the industry. Thus, an intermediate product obtained in the production of aluminium oxide from bauxite or nepheline ores would be preferable for use as the material containing an alkali metal aluminate. The above product is produced by sintering bauxite or nepheline ores mixed with sodium carbonate and limestone at a temperature of 1,200 C. Next the resulting product hereinafter referred to in the description as accordingly a bauxite sinter or a nepheline sinter is cooled and ground to grain size of 0.3-1 mm.
The foregoing grain size is preferred with the mould and core making technique conforming to the present invention.
The chemical and mineralogical composition of the sinters are presented in the Table.
With the use of these sinters both the mixture strength and its hardening rate depends on the amount of sodium aluminate contained therein. Naturally the higher the content of sodium aluminate in said sinters, the higher are the strength and hardening rate of the moulding mixture.
The quantity of the sinter which should be introduced into the mixture in order to secure the requisite strength and hardening rate of the moulds and cores ranges from 3 to 10 parts by weight to provide the sodium aluminate content of 0.5 to 5 percent respectively of the moulding sand weight.
According to this invention, ligno sulphonate of an alkali, alkali-earth metal, ammonium or their mixture is employed as a binder. The most widely known material containing sodium, calcium, ammonium ligno sulphonate or their mixture is the waste product resulting from the production of cellulose from wood pulp by the sulphite process. Hereinafter in the description the product will be referred to as a sulphite alcohol waste liquor.
Maximum efficiency is attained with the ligno sulphonate content ranging from 1 to 5 percent of the weight of the moulding sand.
The sulphite alcohol waste liquor employed in the moulding mixture in accordance with the invention comes from the industry either in a liquid form or in the form of dry concentrates, the ligno sulphonate content varying from 45 to 97 percent by weight. The higher the ligno sulphonate contents in the sulphite alcohol waste liquor, the smaller shall be its amount in the mixture to attain the same strength characteristics of the moulds andcores. The ligno sulphonate content in the liquid sulphite alcohol waste liquor may be characterized by its specific gravity. According to the present invention, the moulding mixture contains commonly an aqueous solution of the sulphite alcohol waste liquor of aspecific gravity of 1.10-1.27 g/cm, the ligno sulphonate content of the solution ranging from 25 to 55 percent by weight which corresponds to its content in the mixture of from 1 to 5 percent of the weight of the moulding sand.
Cited below are exemplary embodiments of this invention in which the sulphite alcohol waste liquor is nate of an alkali, alkali-earth metal, ammonium or their mixture in accordance with the invention, is of particular importance for fluidmoulding sands which, apart fror n the moulding sand, said ligno s ulphonate and the Chemical composition, by weight Sinter SiO Ano Fe,O CaO Na,0
Bauxite sinter -12 29-31 10-11 -22 21-25 Nepheline sinter Mineralogical composition, by weight Dicalcium silicate Sodium Aluminate Sodium ferrite Bauxite sinter 40-55 30-45 8-17 Nepheline sinter 70-80 10-25 2-8 EXAMPLE 1 100 parts by weight of quartz sand are mixed for 2 1.5-2.0 min. with 4.0 parts by weight of a sulphite alcohol waste liquor of a specific gravity of 1.24-1.26 g/cm containing accordingly 48-52 percent by weight of ligno sulphonate, and tempered with 2.0 parts by weight of water. Then 2.5 parts by weight of a bauxite sinter and 40 percent by weight of sodium aluminate are added to the mixture and stirring is continued for 0.5-2.0 min.
The mixture being charged in a core or moulding box, a mould or a core is produced in a conventional manner. Next the mould or the core is left to harden in air.
The compression strength (kg/cm of the moulding sand amounts to:
after air hardening for 1 hr. after air hardening for 3 hrs. after air hardening for 24 hrs.
The strength of the moulds and cores produced thereof can be improved by introducing a known addition into the hardener to bind water in the mixture.
As to the suitable additions, use may be made of loam, bentonite, cement or gypsum to be introduced in amounts ranging from 0.5 to 5 percent of the weight of the moulding mixture.
EXAMPLE 2 100 parts by weight of quartz sand are mixed for 1-2 min. with 4.0 parts by weight of a sulphite alcohol waste liquor of a specific gravity of 1.24-1.26 g/cm containing accordingly 48-52 percent by weight of ligno sulphonate, and with 2.0 parts by weight of water. Then 2.5 parts by weight ofa bauxite sinter, containing A method of hardening the binder ligno sulphomaterial containing alkali metal aluminate, include a foaming agent introduced in the mixture in quantities large enough to pass the mixture to a fluid state.
The amount of the foaming agent ranges within 0.4-1 percent of the weight of the moulding sand.
The foaming agents added to the moulding mixture may constitute anion, cation and nonionogenic surfaceactive materials. These may be alkyl aryl sulphonates, alkyl sulphonates, primary and secondary alkyl sulphates, the products of oxyethylation of alcohols, phenols, amines, quaternary ammonium compounds of long-chain fatty amines.
The most suitable foaming agent is an anion-type surface-active compound, such as sodium alkyl aryl sulphonate ensuring the production of a fluid moulding mixture featuring high flowability and the requisite foam stability in the mixture, i.e., the property to retain mobility during the length of time needed to pour the mixture into core and moulding boxes. An advantage of the fluid moulding sand is its high flowability by which virtue the conventional sand compacting technique can be dropped to be replaced by pouring the sand into the core boxes and on patterns during the production of the moulds and cores.
It should be noted that ligno sulphonate of an alkali, alkali-earth metal, ammonium or their mixture employed according to the invention in the manufacture of moulds and cores as a binder, possesses some foaming capacity, being thereby capable of imparting the mixture a better flowability when it is subjected to intense stirring during preparation.
By using said binder and by adding a small amount of the foaming agent the fluid moulding mixture is especially simple in production.
EXAMPLE 3 A fluid mixture can be prepared by mixing parts by weight of quartz sand, 4.0 parts by weight of a sulphite alcohol waste liquor of a specific gravity of within 1 hr. after manufacture within 3 hrs. after manufacture within 24 hrs. after manufacture Conforming to this invention, the overall strength of the cores can be increased by carbamide introduced into the moulding mixture.
The best results are obtained when adding from 0.8 to 2.0% of carbamide (of the weight of the moulding sand).
We have found that the use of carbamide for improving the strength of the moulds and cores made from a fluid self-hardening sand containing the foaming agent, can reduce appreciably sand humidity; the amount of water added to the sand can be also decreased by 1.0-2.0 percent of the weight of the moulding sand.
EXAMPLE 4 100 parts by weight of quartz sand are mixed with 4.0 parts by weight of a sulphite alcohol waste liquor of a specific gravity of 1.24-1.26 g/cm containing accordingly 48-52 percent by weight of ligno sulphonate, the liquor being preliminarily tempered with 1.0 parts by weight of water in which 0.8 parts by weight of powdered carbamide were dissolved.
Within 1.5-2 min. 2.5 parts by weight of a bauxite sinter containing 40 percent by weight of sodium aluminate are introduced into the moulding mixture.
The moulds and cores made from said mixture featured the following compression strength (kg/cm ufter air hardening for l hr. after air hardening for 3 hrs. after air hardening for 24 hrs.
wuu
incur position disclosed in Example 4 are 0.6 parts by weight of a foaming agent sodium alkyl aryl sulphonate. After the moulding mixture has passed to the fluid state 2.5 parts of a hardening agent a bauxite sinter, containing 40% by weight of sodium aluminate are introduced into the sand.
Said moulding mixture ensures the following compression strength (kglcm of the moulds and cores produced thereof:
after air hardening for 1 hr. 3; after air hardening for 3 hrs. 6.5; after air hardening for 24 hrs. [2.0.
An important merit of the present invention consists in that the strength of foundry moulds and cores will feature a l.5-2-fold increase along with a two-fold increase in the hardening rates.
Peculiar to the cores produced in accordance with the invention is good knockout.
What we claim is:
l. A method of producing foundry moulds and cores comprising the steps of preparing a mixture containing parts by weight of moulding sand, from 1 to 5 parts by weight of an ingredient selected from the group which consists of ligno sulphonates: of an alkali, alkaliearth metal, ammonium and their mixture as a binder, and from 3 to 10 parts by weight of a material containing alkali metal aluminate making moulds and cores from said mixture and holding it for air hardening.
2. A method as of claim 1, in which the aluminate of an alkali metal is sodium aluminate.
3. A method as of claim 1, in which the material containing aluminate of an alkali metal is a bauxite sinter.
4. A method as of claim 1, in which the material con taining aluminate of an alkali metal is a nepheline sinter.
5. A method as of claim 1, in which ligno sulphonate is a sulphite alcohol waste liquor.

Claims (4)

  1. 2. A method as of claim 1, in which the aluminate of an alkali metal is sodium aluminate.
  2. 3. A method as of claim 1, in which the material containing aluminate of an alkali metal is a bauxite sinter.
  3. 4. A method as of claim 1, in which the material containing aluminate of an alkali metal is a nepheline sinter.
  4. 5. A method as of claim 1, in which ligno sulphonate is a sulphite alcohol waste liquor.
US00243066A 1972-04-11 1972-04-11 Method of producing foundry moulds and cores Expired - Lifetime US3804641A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US00243066A US3804641A (en) 1972-04-11 1972-04-11 Method of producing foundry moulds and cores

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00243066A US3804641A (en) 1972-04-11 1972-04-11 Method of producing foundry moulds and cores

Publications (1)

Publication Number Publication Date
US3804641A true US3804641A (en) 1974-04-16

Family

ID=22917228

Family Applications (1)

Application Number Title Priority Date Filing Date
US00243066A Expired - Lifetime US3804641A (en) 1972-04-11 1972-04-11 Method of producing foundry moulds and cores

Country Status (1)

Country Link
US (1) US3804641A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006027A (en) * 1974-02-11 1977-02-01 Abram Moiseevich Lyass Process for producing foundry mounds and cores
US4131477A (en) * 1976-04-01 1978-12-26 Kagan Naum Y Moulding composition for making foundry moulds and cores
US4137085A (en) * 1976-04-08 1979-01-30 Hirofumi Matsui Green sand composition for casting
US4203771A (en) * 1976-04-08 1980-05-20 Hirofumi Matsui Green sand composition for casting
US4357165A (en) * 1978-11-08 1982-11-02 The Duriron Company Aluminosilicate hydrogel bonded granular compositions and method of preparing same
US4432798A (en) * 1980-12-16 1984-02-21 The Duriron Company, Inc. Aluminosilicate hydrogel bonded aggregate articles
US5837047A (en) * 1996-12-11 1998-11-17 Ashland Inc. Heat curable binder systems and their use
US20050017405A1 (en) * 2003-07-25 2005-01-27 Charles Leu Method of manufacturing molded article with decorative pattern
US20110139310A1 (en) * 2009-12-16 2011-06-16 Showman Ralph E Foundry mixes containing sulfate and/or nitrate salts and their uses

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB573171A (en) * 1943-05-01 1945-11-08 Oel & Chemie Werk A G Improvements in or relating to the manufacture of a binding agent for core sand
GB710099A (en) * 1951-04-11 1954-06-09 Harborough Construction Compan Improvements in or relating to the production of moulds, cores and the like
GB714728A (en) * 1950-08-30 1954-09-01 Martin Beilhack Improvements in or relating to moulding masses for foundry purposes and a process for producing such mass
US3032425A (en) * 1958-02-06 1962-05-01 Union Carbide Corp Dry investment mold and method
US3424600A (en) * 1965-05-26 1969-01-28 Abram Moiseevich Liass Liquid mixes for foundry cores and moulds and method of manufacturing foundry cores and moulds from same
US3464838A (en) * 1964-04-06 1969-09-02 Harvest Queen Mill & Elevator Method of casting metallic articles
US3600203A (en) * 1969-09-05 1971-08-17 Sperimentale Metallurg Soc Per Fluidized molding material for manufacturing cores and molds and a method therefor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB573171A (en) * 1943-05-01 1945-11-08 Oel & Chemie Werk A G Improvements in or relating to the manufacture of a binding agent for core sand
GB714728A (en) * 1950-08-30 1954-09-01 Martin Beilhack Improvements in or relating to moulding masses for foundry purposes and a process for producing such mass
GB710099A (en) * 1951-04-11 1954-06-09 Harborough Construction Compan Improvements in or relating to the production of moulds, cores and the like
US3032425A (en) * 1958-02-06 1962-05-01 Union Carbide Corp Dry investment mold and method
US3464838A (en) * 1964-04-06 1969-09-02 Harvest Queen Mill & Elevator Method of casting metallic articles
US3424600A (en) * 1965-05-26 1969-01-28 Abram Moiseevich Liass Liquid mixes for foundry cores and moulds and method of manufacturing foundry cores and moulds from same
US3600203A (en) * 1969-09-05 1971-08-17 Sperimentale Metallurg Soc Per Fluidized molding material for manufacturing cores and molds and a method therefor

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006027A (en) * 1974-02-11 1977-02-01 Abram Moiseevich Lyass Process for producing foundry mounds and cores
US4131477A (en) * 1976-04-01 1978-12-26 Kagan Naum Y Moulding composition for making foundry moulds and cores
US4137085A (en) * 1976-04-08 1979-01-30 Hirofumi Matsui Green sand composition for casting
US4203771A (en) * 1976-04-08 1980-05-20 Hirofumi Matsui Green sand composition for casting
US4357165A (en) * 1978-11-08 1982-11-02 The Duriron Company Aluminosilicate hydrogel bonded granular compositions and method of preparing same
US4432798A (en) * 1980-12-16 1984-02-21 The Duriron Company, Inc. Aluminosilicate hydrogel bonded aggregate articles
US5837047A (en) * 1996-12-11 1998-11-17 Ashland Inc. Heat curable binder systems and their use
US20050017405A1 (en) * 2003-07-25 2005-01-27 Charles Leu Method of manufacturing molded article with decorative pattern
US20110139310A1 (en) * 2009-12-16 2011-06-16 Showman Ralph E Foundry mixes containing sulfate and/or nitrate salts and their uses
WO2011075221A1 (en) 2009-12-16 2011-06-23 Ashland Licensing And Intellectual Property Llc Foundry mixes containing sulfate and/or nitrate salts and their uses
US8426493B2 (en) * 2009-12-16 2013-04-23 Ask Chemicals L.P. Foundry mixes containing sulfate and/or nitrate salts and their uses
EP2513005A4 (en) * 2009-12-16 2015-09-23 Ask Chemicals Lp Foundry mixes containing sulfate and/or nitrate salts and their uses

Similar Documents

Publication Publication Date Title
US3600203A (en) Fluidized molding material for manufacturing cores and molds and a method therefor
US3804641A (en) Method of producing foundry moulds and cores
US3874885A (en) Method of making foundry moulds and cores
US4541869A (en) Process for forming foundry components
US3725090A (en) Method of preparing a liquid mixture for the production of foundry cores and moulds
US4006027A (en) Process for producing foundry mounds and cores
US3826658A (en) Foundry moulding materials
US3615755A (en) Method for making a mold using manganese carbonate
RU2445185C1 (en) Mix for making casting cores and moulds
GB1283301A (en) Improvements in or relating to the manufacture of foundry cores and moulds
US3970462A (en) Self setting molding process
RU2224619C1 (en) Molding sand for making casting molds and cores
KR830003262A (en) Casting mold treatment composition and its manufacturing method
AT323043B (en) SELF-CURING MOLDING MIXTURE FOR MANUFACTURING CASTING FORMS AND CORES
SU1724415A1 (en) Method of producing water-glass binder
SU1682030A1 (en) Method of preparation of water glass binder for mould and core sand
SU852434A1 (en) Suspension for producing ceramic moulds and cores with use of permanent equipment
SU1678497A1 (en) Method of preparation liquid class binder for forming sand and core sand mixtures
CH583075A5 (en) Foundry moulds and cores - contg alkali meeal aluminate as hardener
RU2167021C2 (en) Mixture for manufacture of casting molds and cores
SU1458058A1 (en) Self-hardening sand for making moulds and cores
SU884823A1 (en) Mixture for producing casting moulds and cores
DE2217651A1 (en) Foundry moulds and cores - contg alkali meeal aluminate as hardener
SU1069922A1 (en) Mix for preparing moulds and cores
NO135124B (en)