SE429509B - VIEW TO PREPARE A CASTERY OR FORM OF CORN-SHAPE AND / OR FIBROSE MATERIALS WITH SODIUM SILICATE OR CALCIUM SILICATE AS BINDING AGENT - Google Patents

VIEW TO PREPARE A CASTERY OR FORM OF CORN-SHAPE AND / OR FIBROSE MATERIALS WITH SODIUM SILICATE OR CALCIUM SILICATE AS BINDING AGENT

Info

Publication number
SE429509B
SE429509B SE7907450A SE7907450A SE429509B SE 429509 B SE429509 B SE 429509B SE 7907450 A SE7907450 A SE 7907450A SE 7907450 A SE7907450 A SE 7907450A SE 429509 B SE429509 B SE 429509B
Authority
SE
Sweden
Prior art keywords
core
silicate
mold
added
sodium
Prior art date
Application number
SE7907450A
Other languages
Swedish (sv)
Other versions
SE7907450L (en
Inventor
I Ahlandsberg
L E Petersson
Original Assignee
Ahlsell Ir Ab
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 Ahlsell Ir Ab filed Critical Ahlsell Ir Ab
Priority to SE7907450A priority Critical patent/SE429509B/en
Priority to FI793967A priority patent/FI64525C/en
Priority to NO794187A priority patent/NO151921C/en
Priority to IT28350/79A priority patent/IT1126678B/en
Priority to PCT/SE1979/000257 priority patent/WO1980001254A1/en
Priority to DE19792953426 priority patent/DE2953426C2/en
Priority to JP55500148A priority patent/JPS6338254B2/ja
Priority to GB8026801A priority patent/GB2048735B/en
Priority to FR8018238A priority patent/FR2464766A1/en
Publication of SE7907450L publication Critical patent/SE7907450L/en
Publication of SE429509B publication Critical patent/SE429509B/en

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
    • B22C1/18—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
    • B22C1/186—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 contaming ammonium or metal silicates, silica sols
    • B22C1/188—Alkali metal silicates

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)

Description

15 20 40 '1997456-6 kande material ( t ex någon syra) och även genom värmning av kärnlådorna eller kärnorna upp till en temperatur mellan 250 och SOOOC. På dylikt sätt framställda kärnor förorsakar kraf- tig gasutveckling både vid kärntíllverkning och den efterföl- jande avgjutningen och ger upphov till en ovänlig miljö inom ett sådant gjuteri. Dessutom kräver en dylik kärnframställ- ning en relativt stor energiätgång. Materials (eg some acid) and also by heating the core boxes or cores up to a temperature between 250 and 50 ° C. Cores produced in this way cause strong gas evolution both during nuclear production and the subsequent casting and give rise to an unfriendly environment within such a foundry. In addition, such a nuclear production requires a relatively large energy consumption.

Föreliggande uppfinning har till syfte att reducera nämnda nackdelar och avser ett sätt att framställa en gjuterikärna el- ler form av kornformiga och/eller fíbrösa material med natrium- silikat eller kaliumsilikat som bindemedel, varvid uppfinning- en í huvudsak utmärkes av att ett ytaktivt ämne tillsätts vid blandningen av materialet och att kärnan eller formen uppvärms till mellan 110 och 1so°c.The present invention has for its object to reduce said disadvantages and relates to a method of producing a foundry core or form of granular and / or fibrous materials with sodium silicate or potassium silicate as binder, the invention being mainly characterized in that a surfactant is added in the mixing of the material and that the core or mold is heated to between 110 and 1000 ° C.

Genom att sålunda enligt uppfinningen till formmaterialet tillsätta ett ytaktivt ämne och genom att uppvärma kärnan el- ler formen till mellan 110 och 180°C är det möjligt att i jäm- förelse med vad som hittills är brukligt minska den tillsatta mängden alkalisilikat, utan att hållfastheten och ythårdheten sjunker hos formen eller kärnan. Detta medför att hantering och lagring av formar och kärnor alltjämt kan ske utan svårig- het och att formarna och kärnorna också uppvisar tillfredstäl- lande motstånd mot värme och mekanisk påkänning under gjutning- en. Den låga halten alkalisilikat medför att sönderfallet ef- ter gjutningen blir mycket gott. Gjutningen är dessutom miljö- vänlig emedan hälsovâdliga gaser endast alstras i ringa omfatt- ning. Vid kärntillverkningen blir strålningsvärmen måttlig och energiätgången låg och genom sin snabbhet möjliggör meto- den seriemässig produktion av främst kärnor.Thus, by adding a surfactant to the molding material according to the invention and by heating the core or mold to between 110 and 180 ° C, it is possible to reduce the added amount of alkali silicate, compared to what is hitherto customary, without the strength and the surface hardness decreases with the mold or core. This means that handling and storage of molds and cores can still take place without difficulty and that the molds and cores also show satisfactory resistance to heat and mechanical stress during casting. The low content of alkali silicate means that the decomposition after casting is very good. The casting is also environmentally friendly because hazardous gases are only generated to a small extent. During nuclear production, the radiant heat becomes moderate and the energy consumption is low, and due to its speed, the method enables serial production of mainly nuclei.

Till det material för formen eller kärnan som skall bin- das tillsätts flytande alkalisilikat, ratio (molförhållande) SiO2/Na2O=0,5-3,5, i jämförelsevis liten mängd, samt ett yt- aktivt ämne i form av en tensid, en silikonolja, silikonemul- sion eller silikonat.To the material for the mold or core to be bonded is added liquid alkali silicate, ratio (molar ratio) SiO 2 / Na 2 O = 0.5-3.5, in a comparatively small amount, and a surfactant in the form of a surfactant, a silicone oil, silicone emulsion or siliconate.

För att kunna hälla bíndemedelsmängden på ett minimum och uppnå bästa möjliga sönderfall efter gjutningen används t ex' ett natriumsilikat med vissa tillsatser. Dessa är! a) Ytaktiva ämnen såsom tensider, silikoner (oljor, emulsio- ner] eller silikonater (t ex Berol 305 , Rhodorsil E55 respektive Tegosivinfiš. 10 15 20 25 35 40 7907450-6 b) Sönderfallsmedel och ythårdhetsbildande medel i form av sockerderivat, vilka vanligen behandlats så att de håller sig stabila i natriumsilikatlösning.In order to be able to pour the amount of binder to a minimum and achieve the best possible decomposition after casting, for example, a sodium silicate with certain additives is used. These are! a) Surfactants such as surfactants, silicones (oils, emulsions] or siliconates (eg Berol 305, Rhodorsil E55 and Tegosivin respektive š. 10 15 20 25 35 40 7907450-6 b) Decomposition and surface hardening agents in the form of sugar derivatives, which are usually treated so that they remain stable in sodium silicate solution.

Uppfinningen kommer närmare att beskrivas i form av exem- pel på uppfinningens tillämpning, varvid det skall observeras, att den hittills vanliga mängden alkalisilikat, räknat på sandmängden, är 3-5 % och mera. 1) En blandning bereddes av sand och 1,5 % natriumsilikat (ra- tio 2,7) räknat på sandmängden samt 0,015 % silikonemulsion (35 procentig). Av denna blandning tillverkades cylindriska provkroppar med höjden 50 mm och diametern 50 mm. Provkroppar- na härdade vid 150°C och tryckprovades efter avsvalning. Här- vid erhölls tryckhållfastheter på 500-600 N/cmz. Ett nollprov utan silikontillsats gav tryckhållfastheter på endast 80-90 N/cmz.The invention will be described in more detail in the form of examples of the application of the invention, it being observed that the hitherto usual amount of alkali silicate, calculated on the amount of sand, is 3-5% and more. 1) A mixture was prepared from sand and 1.5% sodium silicate (ratio 2.7) based on the amount of sand and 0.015% silicone emulsion (35%). From this mixture, cylindrical specimens with a height of 50 mm and a diameter of 50 mm were made. The specimens were cured at 150 ° C and pressure tested after cooling. This gave compressive strengths of 500-600 N / cmz. A blank without silicone additive gave compressive strengths of only 80-90 N / cmz.

Vid en natriumsilikathalt av 2 % och 0,02 % silikonemul- sion erhölls tryckhållfastheter på ca 800 Nficmz, medan noll- firovet gav ca S50 N/cmz. 2) En kärnlåda uppvärmdes till 150°C i en kärnskjutmaskin i ett bilgodsgjuteri. En kärnmassa bereddes av sand (medelkorn- storlek 0,25 mm) samt 2,5 % ovan. Kärnmassan påfylldes i maskinen och kärnan sköts med ett sådant tryck att god packningsgrad erhölls, normalt 400- 700 kPa (4-7 kg/cmz). Kärnorna fick värmehärda i lådan i 20- 60 sekunder beroende på tjocklek (10-50 mm), varefter de var klara för avgjutning. 3) Kärntillverkning utfördes enligt ovan, Kärnorna var nu emellertid tjockare varför även varmluft (110-150°C) blåstes genom kärnlädan. Pâ detta sätt var det möjligt att på mindre än 60 sekunder tillverka fullgoda kärnor. 4) Kärntillverkningen utfördes enligt 3). Varmluften ersattes dock här av C02-gas. Även på detta sätt var det möjligt att tillverka fullgoda kärnor. Detta har tidigare ej varit möj- ligt vid ovan beskrivna alkalisilikathalter. 5) Kärntillverkningen utfördes enligt 3) men där en del av , varmluften ersatts av C02. Fullgoda kärnor erhölls. 6) Kärntillverkningen utfördes enligt 4). Här utgjordes dock bindemedlet av 3 % (vikts) rent natriumsilikat 49° Bé, ratio 2,7, samt 1 % av ett sockerderivat, dvs total bíndemedels- mängd 4 %. Kärnorna erhöll god ythårdhet. Sönderfallet efter av ett bindemedel enligt 79Û71§5Û=6 gjutningen är dock något sämre än för 2), 3) och 4] enligt ovan. 7) Kärntillverkningen utfördes enligt 3) men med tillsats av 7-10 % av en esterhärdare av gängse typ. Härigenom erhölls en snabbare genomtorkning av kärnan, vilket är av värde vid till- verkning av större formar/kärnor.At a sodium silicate content of 2% and 0.02% silicone emulsion, compressive strengths of about 800 N fi cm 2 were obtained, while the zero fi yield gave about S50 N / cm 2. 2) A core box was heated to 150 ° C in a core firing machine in a car body foundry. A core mass was prepared from sand (average grain size 0.25 mm) and 2.5% above. The core mass was filled into the machine and the core was operated with such a pressure that a good degree of packing was obtained, normally 400-700 kPa (4-7 kg / cm 2). The cores were allowed to heat cure in the box for 20-60 seconds depending on thickness (10-50 mm), after which they were ready for casting. 3) Core production was carried out as above, however, the cores were now thicker, so hot air (110-150 ° C) was also blown through the core sled. In this way it was possible to manufacture complete kernels in less than 60 seconds. 4) The core production was performed according to 3). However, the hot air was replaced here by CO2 gas. In this way, too, it was possible to produce complete kernels. This has not previously been possible at alkali silicate contents described above. 5) The core production was carried out according to 3) but where part of the hot air was replaced by CO 2. Full-bodied kernels were obtained. 6) The core production was performed according to 4). Here, however, the binder consisted of 3% (weighted) pure sodium silicate 49 ° Bé, ratio 2.7, and 1% of a sugar derivative, ie the total amount of binder was 4%. The cores obtained good surface hardness. However, the decomposition after of a binder according to 79Û71§5Û = 6 casting is slightly worse than for 2), 3) and 4] as above. 7) The core production was carried out according to 3) but with the addition of 7-10% of an ester hardener of the usual type. As a result, a faster drying of the core was obtained, which is of value in the manufacture of larger molds / cores.

Det har vid försök visat sig att halterna av det ytaktíva ämnet ej bör överstiga 0,1 % räknat på viktsmängden material, och lämpligen ligga inom området 0,00G1-0,1 %.Experiments have shown that the levels of the surfactant should not exceed 0.1% by weight of the material, and should preferably be in the range 0.00G1-0.1%.

Claims (6)

7907450-6 Pateïítkïavi7907450-6 Pateïítkïavi 1. Sätt att framställa en gjuterikärna eller form av korn- tormiga och/eller fíbrösa material med natriumsilikat eller kalium- silikat som bindemedel, k ä n n e t e c k n a t av att natrium- eller kaliumsilikat tillsätts blandningen av materialet i en mängd av 1-3% räknat på viktsmängden material, att ett ytaktivt ämne såsom silikonolja, silikonemulsíon eller silikonat, företrädesvis silikon- emulsion, tillsätts i en mängd ej överstigande 0,1% räknat på víkts- mängden material, och blandas med bindemedlet och att blandningen av ämnet och bindemedlet håller sig stabil och att kärnan eller formen uppvärms till mellan 110 och 180°C.Method for preparing a foundry core or form of granular and / or fibrous materials with sodium silicate or potassium silicate as binder, characterized in that sodium or potassium silicate is added to the mixture in an amount of 1-3% based on the amount by weight of material, that a surfactant such as silicone oil, silicone emulsion or siliconate, preferably silicone emulsion, is added in an amount not exceeding 0.1% by weight of the material, and mixed with the binder and that the mixture of the substance and the binder remains stable and that the core or mold is heated to between 110 and 180 ° C. 2. Sätt enligt krav 1, k ä n n e t e c k n a t av att en kärnlåda används, som uppvärms till 110-180°C.2. A method according to claim 1, characterized in that a core box is used, which is heated to 110-180 ° C. 3. Sätt enligt krav 1 eller 2, k ä n n e t e c k n a t av att kärnan genomblåses med varmluft med en temperatur av 110-180°C.3. A method according to claim 1 or 2, characterized in that the core is blown through with hot air at a temperature of 110-180 ° C. 4. Sätt enligt krav 1 eller 2, k ä n n e t e c'k n a t av att kärnan genomblåses med C02 med eller utan kompletterande genom- blàsning av varmluft.4. A method according to claim 1 or 2, characterized in that the core is blown through with CO 2 with or without additional blowing of hot air. 5. S. Sätt enligt något av kraven 2-4, k ä n n e t e c k n a t av att kärnan eller formen bildas av kärn- respektive formmassa som tillsatts en esterhärdare.5. S. A method according to any one of claims 2-4, characterized in that the core or mold is formed of core or molding compound to which an ester hardener has been added. 6. Sätt enligt något av föregående krav, k ä n n e t e c k- n a t av att natrium- eller kaliumsilíkat har ett molförhållande av mellan 2 och 3. 7907450-6 SAMMANDRAG Härmed avses ett sätt att framställa en gjuterikärna el- ler -form bunden med alkalísilikat, varvid ett ytaktivt ämne tillsätts vid blandningen av formmaterialet och formen eller kärnan uppvärms måttligt, dvs till en temperatur av mellan 11o°c och 1so°c.6. A method according to any one of the preceding claims, characterized in that sodium or potassium silicate has a molar ratio of between 2 and 3. 7907450-6 SUMMARY This refers to a method of preparing a foundry core or mold bonded with alkali silicate , wherein a surfactant is added to the mixture of the molding material and the mold or core is moderately heated, i.e. to a temperature of between 110 ° C and 1000 ° C.
SE7907450A 1978-12-21 1979-09-07 VIEW TO PREPARE A CASTERY OR FORM OF CORN-SHAPE AND / OR FIBROSE MATERIALS WITH SODIUM SILICATE OR CALCIUM SILICATE AS BINDING AGENT SE429509B (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
SE7907450A SE429509B (en) 1979-09-07 1979-09-07 VIEW TO PREPARE A CASTERY OR FORM OF CORN-SHAPE AND / OR FIBROSE MATERIALS WITH SODIUM SILICATE OR CALCIUM SILICATE AS BINDING AGENT
FI793967A FI64525C (en) 1978-12-21 1979-12-18 SAETT ATT FRAMSTAELLA EN GJUTKAERNA ELLER -FORM AV KORNFORMIGAOCH / ELLER FIBROESA MATERIAL
NO794187A NO151921C (en) 1978-12-21 1979-12-20 PROCEDURE FOR THE PREPARATION OF A CASTLE CORE OR CASTLE FORM OF CORN-FORMED AND / OR FIBROSE MATERIAL
IT28350/79A IT1126678B (en) 1978-12-21 1979-12-21 METHOD FOR FORMING A SOUL OR FOUNDRY FORM OF GRANULAR AND / OR FIBROUS MATERIAL
PCT/SE1979/000257 WO1980001254A1 (en) 1978-12-21 1979-12-21 A method of manufacturing a foundry core or mould of granular and/or fibrous material
DE19792953426 DE2953426C2 (en) 1978-12-21 1979-12-21 Process for producing a foundry core or a foundry mold from granular and / or fibrous material
JP55500148A JPS6338254B2 (en) 1978-12-21 1979-12-21
GB8026801A GB2048735B (en) 1978-12-21 1979-12-21 Method of manufacturing a foundry core or mould of granular and/or fibrous material
FR8018238A FR2464766A1 (en) 1979-09-07 1980-08-20 Foundry mould or core mfr. from granular and/or fibrous material - using silicate binder and surfactant to increase strength and facilitate disintegration after use

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7907450A SE429509B (en) 1979-09-07 1979-09-07 VIEW TO PREPARE A CASTERY OR FORM OF CORN-SHAPE AND / OR FIBROSE MATERIALS WITH SODIUM SILICATE OR CALCIUM SILICATE AS BINDING AGENT

Publications (2)

Publication Number Publication Date
SE7907450L SE7907450L (en) 1981-03-08
SE429509B true SE429509B (en) 1983-09-12

Family

ID=20338784

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7907450A SE429509B (en) 1978-12-21 1979-09-07 VIEW TO PREPARE A CASTERY OR FORM OF CORN-SHAPE AND / OR FIBROSE MATERIALS WITH SODIUM SILICATE OR CALCIUM SILICATE AS BINDING AGENT

Country Status (2)

Country Link
FR (1) FR2464766A1 (en)
SE (1) SE429509B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29925010U1 (en) * 1999-10-26 2008-09-04 Mincelco Gmbh Water glass bonded core molding material

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1240877A (en) * 1968-07-26 1971-07-28 British Non Ferrous Metals Res Foundry moulding sand compositions
GB2016483A (en) * 1978-03-09 1979-09-26 Ahlsell Ir Ab Method at the making of bodies of granular and/or fibrous material with sodium silicate or potassium silicate as binder
DE2856267A1 (en) * 1978-12-27 1980-07-17 Woellner Werke Free-flowing, non-settling alkali silicate binder - for foundry moulds and cores, contg. anionic or nonionic surfactant

Also Published As

Publication number Publication date
SE7907450L (en) 1981-03-08
FR2464766A1 (en) 1981-03-20
FR2464766B1 (en) 1984-10-19

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