CH258901A - Process for the agglomeration of molding sands. - Google Patents
Process for the agglomeration of molding sands.Info
- Publication number
- CH258901A CH258901A CH258901DA CH258901A CH 258901 A CH258901 A CH 258901A CH 258901D A CH258901D A CH 258901DA CH 258901 A CH258901 A CH 258901A
- Authority
- CH
- Switzerland
- Prior art keywords
- agglomeration
- sands
- molding sands
- oil
- drying oil
- Prior art date
Links
- 238000005054 agglomeration Methods 0.000 title claims description 4
- 230000002776 aggregation Effects 0.000 title claims description 4
- 238000000034 method Methods 0.000 title claims description 4
- 238000000465 moulding Methods 0.000 title claims description 4
- 238000001035 drying Methods 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 4
- 229920003002 synthetic resin Polymers 0.000 claims description 4
- 239000000057 synthetic resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 229920002472 Starch Polymers 0.000 claims description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 2
- 239000004202 carbamide Substances 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- B22C1/24—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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mold Materials And Core Materials (AREA)
Description
Procédé pour l'agglomération de sables de moulage. Il est hautement désirable en fonderie d'agglomérer les sables à noyaux et sables de moulage à l'aide d'un matière agglomérante qui, d'une part, à l'a, chaleur du métal fondu, la se consume complètement pour permettre> sortie du sable après refroidissement et qui, d'autre part, à la température du métal fondu, est suffisamment plastique pour céder au retrait du métal pendant son refroidisse ment.
Les agglomérants employés. actuellement en fonderie ne possèdent pas cette thermo- plasticité ou ne la possèdent que d'une façon insuffisante. Il en résulte des criques qui sont la cause de déchets importants. En vue de les éviter, le fondeur est souvent obligé à un travail supplémentaire consistant dans l'évidement du noyau après séchage.
Le procédé pour l'agglomération dessables de moulage et notamment des sables, à noyaux, qui constitue l'objet de la présente invention, obvie à ces inconvénients par le fait que l'on utilise comme agglomérant un produit préparé en mélangeant une résine synthétique résultant d'une condensation en tre de l'amidon, du formol, de l'urée et du phénol avec une huile siccative et une huile non siccative dans les, proportions de 75 kg de cette résine, à l'état sec, pour 23 kg d'huile siccative et 2 kg d'huile non siccative-,
le sable étant traité avec une quantité de 2 à 3 pour cent de cet agglomérant. Une telle résine synthétique peut être pré parée comme décrit,dans le brevet no 254540 (lu 31 mai 1946, au nom de la même titulaire.
Ladite résine peut être utilisée soit sous forme de produit solide pulvérisé, soit sous forme de produit pâteux ou sirupeux.
Les noyaux préparés de cette façon à l'aide de sables ainsi agglomérés présentent cet avantage que l'agglomérant se consume complètement tout en offrant la thermo-plas- ticité requise, de sorte que les pièces da fon derie obtenues sont exemptes de criques. De plus, l'agglomérant à base de résine synthé tique amylacée offre l'avantage d'un faible prix de revient.
Process for the agglomeration of molding sands. It is highly desirable in foundry to agglomerate the core sands and casting sands with the aid of an agglomerating material which, on the one hand, with the heat of the molten metal, burns it completely to allow> outlet of the sand after cooling and which, on the other hand, at the temperature of the molten metal, is sufficiently plastic to yield to shrinkage of the metal during its cooling.
The agglomerants used. currently in foundries do not have this thermoplasticity or only have it insufficiently. This results in cracks which are the cause of significant waste. In order to avoid them, the founder is often obliged to carry out additional work consisting of hollowing out the core after drying.
The process for the agglomeration of molding sands and in particular sands, with cores, which constitutes the object of the present invention, obviates these drawbacks by the fact that one uses as binder a product prepared by mixing a resulting synthetic resin. of a condensation between starch, formalin, urea and phenol with a drying oil and a non-drying oil in the proportions of 75 kg of this resin, in the dry state, for 23 kg drying oil and 2 kg non-drying oil,
the sand being treated with an amount of 2 to 3 percent of this binder. Such a synthetic resin can be prepared as described in Patent No. 254540 (read May 31, 1946, on behalf of the same patentee.
Said resin can be used either in the form of a pulverized solid product, or in the form of a pasty or syrupy product.
The cores prepared in this way with the aid of sands thus agglomerated have the advantage that the binder burns completely while providing the required thermoplasticity, so that the foundry pieces obtained are free from cracks. In addition, the binder based on a starchy synthetic resin offers the advantage of a low cost price.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH258901T | 1946-06-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH258901A true CH258901A (en) | 1948-12-31 |
Family
ID=4472855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH258901D CH258901A (en) | 1946-06-20 | 1946-06-20 | Process for the agglomeration of molding sands. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH258901A (en) |
-
1946
- 1946-06-20 CH CH258901D patent/CH258901A/en unknown
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