CH317962A - Process for the production of foundry sand cores and molds - Google Patents
Process for the production of foundry sand cores and moldsInfo
- Publication number
- CH317962A CH317962A CH317962DA CH317962A CH 317962 A CH317962 A CH 317962A CH 317962D A CH317962D A CH 317962DA CH 317962 A CH317962 A CH 317962A
- Authority
- CH
- Switzerland
- Prior art keywords
- hydrophobic
- cement
- sand
- plasticizing agent
- parts
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 230000002209 hydrophobic effect Effects 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 7
- 150000004665 fatty acids Chemical class 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 4
- 229930195729 fatty acid Natural products 0.000 claims description 4
- 239000000194 fatty acid Substances 0.000 claims description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 235000013379 molasses Nutrition 0.000 claims description 4
- 229920001353 Dextrin Polymers 0.000 claims description 3
- 239000003110 molding sand Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 239000004375 Dextrin Substances 0.000 claims description 2
- 235000019425 dextrin Nutrition 0.000 claims description 2
- 238000004821 distillation Methods 0.000 claims description 2
- 229920000126 latex Polymers 0.000 claims description 2
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 2
- 239000011118 polyvinyl acetate Substances 0.000 claims description 2
- 239000011271 tar pitch Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 6
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims 1
- 239000004902 Softening Agent Substances 0.000 claims 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 239000011230 binding agent Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- 239000011295 pitch Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 description 1
- 241000219310 Beta vulgaris subsp. vulgaris Species 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- DCXXMTOCNZCJGO-UHFFFAOYSA-N Glycerol trioctadecanoate Natural products CCCCCCCCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCCCC DCXXMTOCNZCJGO-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 235000021536 Sugar beet Nutrition 0.000 description 1
- RSWGJHLUYNHPMX-ONCXSQPRSA-N abietic acid Chemical compound C([C@@H]12)CC(C(C)C)=CC1=CC[C@@H]1[C@]2(C)CCC[C@@]1(C)C(O)=O RSWGJHLUYNHPMX-ONCXSQPRSA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000001055 chewing effect Effects 0.000 description 1
- FYGDTMLNYKFZSV-MRCIVHHJSA-N dextrin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)OC1O[C@@H]1[C@@H](CO)OC(O[C@@H]2[C@H](O[C@H](O)[C@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O FYGDTMLNYKFZSV-MRCIVHHJSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000135 prohibitive effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229960004793 sucrose Drugs 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin 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
- B22C1/167—Mixtures of inorganic and organic binding agents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Description
<B>Verfahren zur Herstellung von</B> Giessereisandkernen <B>und -formen</B> In den Stahl- und Eisengiessereien ist es seit langem üblich, Kerne und Formen, die in folge ihrer Formgebung oder Grösse dazu ge.eig- riet sind, mit sogenannten Erstarrungsbindern herzustellen. Es sind dies Bindemittel auf Basis von Kunstharzen oder von trocknenden Ölen, die durch Polymerisations- und Oxydationsvor gänge dem als Formmaterial benützten Sand die gewünschten mechanischen und giessereitech- nischen Eigenschaften verleihen.
Es ist schon vielfach versucht worden, die sen Abbinde- oder Erstarrungseffekt mittels eines viel billigeren Binders, z. B. Zement, zu erreichen, wobei aber zum Teil schwerwiegende und giessereitechnisch prohibitive Nachteile in Kauf genommen werden mussten. Speziell die grosse Härte und Sprödigkeit des abgebunde nen Sand-Zement-Kerns schloss eine Verwen dung bei dünnwandigen Gussstücken aus, da die Kerne stark zum Reissen neigten, wenn das flüssige Metall erstarrte.
Diese grosse Härte und Sprödigkeit der Kerne bedingte ebenfalls Giessereimodelle, die dem Zementverfahren speziell angepasst waren, da sonst bei kompli zierten Formen Kern und Holzmodell nicht mehr voneinander gelöst werden konnten.
Bei der Herstellung von Zementformen war die verhältnismässig lange Abbindezeit des Ze- ment-Sand-Gemisches hinderlich, da das Ab heben des Modells von der Form nicht innert nützlicher Frist bewerkstelligt werden konnte.
Die vorliegende Erfindung bezweckt, die geschilderten Unzukömmlichkeiten bei der Ver- wendung von Zement-Sand-Mischungen in der Giesserei zu beheben und deren Gebrauch auf breitester Basis zu erlauben, das heisst: Ab bindezeit, Elastizität und Zerfall nach dem Abguss auf die gewünschten und giessereitech- nisch brauchbaren Werte zu bringen.
Das erfindungsgemässe Verfahren zur Her -Stellung von Giesserei-Sandkernen und -Sand formen ist dadurch gekennzeichnet, dass man den Formsand mit Zement und einer Mischung von Melasse, Sulfitablauge, hydrophoben, auf den Zement weichmachend wirkenden Stoffen, Dextrin und Mineralsäure verarbeitet, verformt und abbinden lässt.
Als hydrophobe Weichmacher für den Ze ment eignen sich insbesondere Fettsäuren Rückstände . der Fettsäuredestillation, soge- nannte Stearinpeche, polymerisierte Öle, Kolo phonium, Teerpech, Kauts chuklatex, Polyvinyl- acetat usw. oder Mischungen dieser Stoffe.
Die bevorzugte Mineralsäure ist Schwefel säure; da sie bei der Hitze des Giessens eineKar- bonisierung der organischen Komponenten be wirkt, welche die Porosität der Kerne und Formen günstig beeinflusst.
Beispiel <I>1</I> Es wird eine Emulsion von 60 Gewichts teilen Zuckerrübenmelasse, 30 GT Sulfitablauge von 32 Baume, 5 GT Kartoffeldextrin, 5 GT -Leinölfettsäure und 2 GT Schwefelsäure 95 /oig hergestellt.
Dieselbe wird einem Gemisch von 92 Volumteilen Quarzsand und 8 Volumteilen Portlandzement in der Menge von 5 Volum- teilen in einem Sandmischer zugesetzt und anschliessend Wasser bis zum formgerechten Zustande beigegeben. Die so aufbereitete Mischung hat eine A bbindezeit von 2-3 Stun den als Formsand.
<I>Beispiel 2</I> Es wird eine Emulsion von 60 Gewichts teilen Rohrzuckermelasse, 10 GT Glukose, 10 GT Stearinpech, 8,5 GT Wasser und 9,5 GT Maisdextrin, und mit 2,0 GT Schwefel säure 95 /o versetzt.
Diese Emulsion wird einem Gemisch von 90 Volumteilen Quarzsand und 10 Volumteilen Portlandzement in der Menge von 4 Volumteilen in einem Sandmischer zu gesetzt und anschliessend Wasser bis zum form gerechten Zustande beigegeben. Die auf diese Weise aufbereitete Mischung hat eine Abbinde zeit von 4 Stunden als Kernsand:
<B> Process for the production of </B> foundry sand cores <B> and molds </B> In steel and iron foundries, it has long been customary to produce cores and molds that are suitable due to their shape or size. are advised to use so-called solidification binders. These are binders based on synthetic resins or drying oils which, through polymerization and oxidation processes, give the sand used as a molding material the desired mechanical and foundry properties.
It has been tried many times, the sen setting or solidification effect using a much cheaper binder, such. B. cement to achieve, but sometimes serious and foundry technically prohibitive disadvantages had to be accepted. In particular, the great hardness and brittleness of the set sand-cement core ruled out its use in thin-walled castings, since the cores had a strong tendency to crack when the liquid metal solidified.
This great hardness and brittleness of the cores also required foundry models that were specially adapted to the cement process, as otherwise the core and wooden model could no longer be separated from one another in the case of complicated shapes.
In the manufacture of cement molds, the relatively long setting time of the cement-sand mixture was a hindrance, since the model could not be lifted from the mold within a reasonable period of time.
The aim of the present invention is to remedy the described inconveniences in the use of cement-sand mixtures in the foundry and to allow their use on the broadest basis, that is: from setting time, elasticity and disintegration after casting to the desired and giessereitech - to bring usable values.
The inventive method for the production of foundry sand cores and sand forms is characterized in that the molding sand is processed, shaped and set with cement and a mixture of molasses, sulphite waste liquor, hydrophobic substances that soften the cement, dextrin and mineral acid leaves.
Fatty acid residues are particularly suitable as hydrophobic plasticizers for the cement. fatty acid distillation, so-called stearic pitch, polymerized oils, colophonium, tar pitch, chewing latex, polyvinyl acetate etc. or mixtures of these substances.
The preferred mineral acid is sulfuric acid; as it causes carbonization of the organic components at the heat of casting, which has a favorable effect on the porosity of the cores and molds.
Example <I> 1 </I> An emulsion of 60 parts by weight of sugar beet molasses, 30 parts by weight of sulphite waste liquor from 32 Baume, 5 parts by weight of potato dextrin, 5 parts by weight of linoleum fatty acid and 2 parts by weight of 95% sulfuric acid is produced.
The same is added to a mixture of 92 parts by volume of quartz sand and 8 parts by volume of Portland cement in an amount of 5 parts by volume in a sand mixer, and then water is added until it is in the correct shape. The mixture prepared in this way has a setting time of 2-3 hours as molding sand.
<I> Example 2 </I> An emulsion of 60 parts by weight cane sugar molasses, 10 parts by weight of glucose, 10 parts by weight of stearin pitch, 8.5 parts by weight of water and 9.5 parts by weight of corn dextrin, and with 2.0 parts by weight of sulfuric acid 95 / o offset.
This emulsion is added to a mixture of 90 parts by volume of quartz sand and 10 parts by volume of Portland cement in the amount of 4 parts by volume in a sand mixer and then water is added until it is in the right shape. The mixture prepared in this way has a setting time of 4 hours as core sand:
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH317962T | 1953-12-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH317962A true CH317962A (en) | 1956-12-15 |
Family
ID=4497018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH317962D CH317962A (en) | 1953-12-14 | 1953-12-14 | Process for the production of foundry sand cores and molds |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH317962A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1508689B1 (en) * | 1965-10-22 | 1970-03-05 | Mitsubishi Heavy Ind Ltd | Binder-containing molding sand |
-
1953
- 1953-12-14 CH CH317962D patent/CH317962A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1508689B1 (en) * | 1965-10-22 | 1970-03-05 | Mitsubishi Heavy Ind Ltd | Binder-containing molding sand |
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