CH251941A - A method of manufacturing an agglomerating agent intended in particular for the agglomeration of foundry core sands. - Google Patents
A method of manufacturing an agglomerating agent intended in particular for the agglomeration of foundry core sands.Info
- Publication number
- CH251941A CH251941A CH251941DA CH251941A CH 251941 A CH251941 A CH 251941A CH 251941D A CH251941D A CH 251941DA CH 251941 A CH251941 A CH 251941A
- Authority
- CH
- Switzerland
- Prior art keywords
- agglomeration
- manufacturing
- foundry core
- agglomerating agent
- mixture
- Prior art date
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
- B22C1/16—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
- B22C1/20—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 organic agents
- B22C1/26—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 organic agents of carbohydrates; of distillation residues therefrom
-
- 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
- B22C1/20—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 organic agents
- B22C1/22—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 organic agents of resins or rosins
- B22C1/2293—Natural polymers
-
- 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
- B22C1/20—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 organic agents
- B22C1/24—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 organic agents of oily or fatty substances; of distillation residues therefrom
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Mold Materials And Core Materials (AREA)
Description
Procédé de fabrication d'un agglomérant destiné notamment à l'agglomération des sables à noyaux de fonderie. Dans les problèmes d'agglomérations, et particulièrement pour les sables à noyaux de fonderie, il est désirable que l'agglomé rant donne au mélange ,à agglomérer les trois propriétés suivantes: 1o Après malaxage avec l'agglomérant, le mélange doit avoir de la plasticité qui lui permet de bien se prêter au moulage, et de la "cohésion à vert" qui lui permet, après démoulage, de conserver rigoureusement la forme du moule, dans les manipulations aux quelles on peut le soumettre.
20 Le mélange ainsi moulé, porté à l'étuve et soumis à une cuisson de 180 à 240 C doit, après une ou deux heures, donner un corps dur insensible à la reprise d'humidité, et per mettant en particulier de recevoir sans se dégrader un jet de fonte ou,d'acier en fusion.
30 Cependant, après la coulée du métal, lorsque celui-ci commence à se solidifier, il faut que l'agglomérant se consume pour per- mettre au sable contenu à l'intérieur de la pièce coulée de sortir facilement par des ori fices parfois très restreints.
A ce jour, il n'existait pas d'agglomé- rants donnant ces trois propriétés simultané ment. Ainsi, par exemple, l'huile de lin et les huiles siccatives en général ont bien les propriétés 2 et 3. Les dextrines et les mé lasses ont les propriétés 1 et 3, mais pas la propriété 2. Cela est ,si vrai qu'il est de noto riété publique que les agglomérants se font en fonderie par mélanges plus ou moins heu reux de produits divers comportant toujours l'huile de lin et dextrine.
La présente invention se rapporte à un procédé de fabrication d'un agglomérant des tiné notamment ,à l'agglomération des, sables de fonderie, caractérisé en ce que l'on hydro lyse une matière a;my'la@eée de façon à ,obtenir un mélange d'amidon soluble, de dextrine et de glucose et en ce qu'on émulsionne une huile dans ce -mélange.
Dans une forme de réalisation de l'inven tion, on traite dans dés conditions convena bles de températureet de pression de la fécule avec de l'acide oxalique. On évapore sous vide après: neutralisation jusqu'à l'obtention d'un sirop .à 80 % de matières sèches. On émulsionne alors dans le sirop ainsi obtenu de l'huile de lin ou autre huile siccative ou un mélange d'huile siccative et de résines, sui vant le genre d'application à laquelle le pro doit est destiné.
A titre d'exemple, 100 kg de fécule sont traités avec 1,800 kg d'acide oxalique, puis on émulsionne dans le sirop obtenu après neutralisation et évaporation, 30 parties d'huile de lin. Pour préparer un sable à noyaux, on mélange par exemple 3 kg du produit obtenu à 100 kg de sble siliceux.- On obtient un mélange possédant les trois pro- pri6tés indiquées: plasticité -et cohésion en vert, solidité et insensibilité à l'humidité après cuisson et combustion de l'agglomérant à haute température.
A method of manufacturing an agglomerating agent intended in particular for the agglomeration of foundry core sands. In the problems of agglomerations, and particularly for foundry core sands, it is desirable that the agglomerate rant gives the mixture to agglomerate the following three properties: 1o After kneading with the binder, the mixture must have plasticity which allows it to lend itself well to molding, and the "green cohesion" which allows it, after demolding, to strictly retain the shape of the mold, in the manipulations to which it can be subjected.
20 The mixture thus molded, brought to an oven and baked at 180 to 240 C must, after one or two hours, give a hard body insensitive to moisture uptake, and in particular allowing to receive without degrade a stream of cast iron or molten steel.
However, after the metal has been poured, when it begins to solidify, the binder must be consumed in order to allow the sand contained inside the casting to easily exit through sometimes very large orifices. restricted.
To date, there have been no agglomerates which give these three properties simultaneously. So, for example, linseed oil and drying oils in general do have properties 2 and 3. Dextrins and molasses have properties 1 and 3, but not property 2. This is so true that it is well known that the agglomerants are made in a foundry by more or less happy mixtures of various products always comprising linseed oil and dextrin.
The present invention relates to a method of manufacturing an agglomerating agent in particular, for the agglomeration of foundry sands, characterized in that a material is hydrolysed a; my'la @ eée so as to, obtaining a mixture of soluble starch, dextrin and glucose and in that an oil is emulsified in this mixture.
In one embodiment of the invention, the starch is treated under suitable temperature and pressure conditions with oxalic acid. Evaporated in vacuo after: neutralization until obtaining a syrup. 80% dry matter. Linseed oil or other drying oil or a mixture of drying oil and resins are then emulsified in the syrup thus obtained, depending on the type of application for which the pro is intended.
By way of example, 100 kg of starch are treated with 1,800 kg of oxalic acid, then 30 parts of linseed oil are emulsified in the syrup obtained after neutralization and evaporation. To prepare a core sand, for example 3 kg of the product obtained is mixed with 100 kg of siliceous sand. A mixture is obtained having the three properties indicated: plasticity and cohesion in green, solidity and insensitivity to humidity. after cooking and combustion of the binder at high temperature.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR251941X | 1941-05-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH251941A true CH251941A (en) | 1947-11-30 |
Family
ID=8884160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH251941D CH251941A (en) | 1941-05-09 | 1945-10-22 | A method of manufacturing an agglomerating agent intended in particular for the agglomeration of foundry core sands. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH251941A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1129659B (en) * | 1954-10-06 | 1962-05-17 | Mo Och Domsjoe Ab | Use of cellulose ethers for foundry moldings made of sand |
-
1945
- 1945-10-22 CH CH251941D patent/CH251941A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1129659B (en) * | 1954-10-06 | 1962-05-17 | Mo Och Domsjoe Ab | Use of cellulose ethers for foundry moldings made of sand |
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