WO1980001254A1 - A method of manufacturing a foundry core or mould of granular and/or fibrous material - Google Patents
A method of manufacturing a foundry core or mould of granular and/or fibrous material Download PDFInfo
- Publication number
- WO1980001254A1 WO1980001254A1 PCT/SE1979/000257 SE7900257W WO8001254A1 WO 1980001254 A1 WO1980001254 A1 WO 1980001254A1 SE 7900257 W SE7900257 W SE 7900257W WO 8001254 A1 WO8001254 A1 WO 8001254A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- core
- mould
- manufacturing
- added
- cores
- 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
- B22C1/18—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
Definitions
- Priority Country SE the claims and to be republished in the event of the receipt of amendments.
- a surface-active substance is adde at the mixing of the mould material, and the mould or core are heated moderately, i.e. to a temperature of between 1 lOoC and 180OC.
- This invention relates to a method of manufacturing a foundry core or mould of granular and/or fibrous material with sodium silicate or potassium silicate as binding agent.
- Sodium or potassium silicate hereinafter called alkali silicate
- the moulds and cores are quenched at room temperature by means of admixed hardeners or by blowing through with CO 2 .
- Such a manufacture requires a relatively high binding agent content for achieving sufficient strength.
- the use of alkali silicate as binding agent involves several other disadvantages, of which .particularly the following ones may be mentioned:
- the present invention has the object to reduce the aforesaid disadvantages and relates to a method of manufacturing a foundry core or mould of granular and/or fibrous material with. sodium silicate or potassium silicate as binding agent.
- the casting besides, is protective to the environment, because gases detrimental to health are produced only to a small extent.
- the radiation heat at the core manufacture is moderate, and the nergy consumption is low. Owing to its rapid procedure, the method renders possible series production above all of cores.
- liquid alkali silicate, ratio (molar ratio) SiO 2 /N 2 O-0.5-3.5, in a relatively small amount and a surface-active substance in the form of a tenside, a silicone oil, silicone emulsion or siliconate are added to the mould or core material to be bound.
- a sodium silicate with certain additives which latter are: a) Surface-active substances such as tensides, silicones (oils, emulsions) or siliconates (for example Berol 305 ® . Rhodorsil E55 ® and, respectively, Tegosivin ® . b) Disintegration agents and surface-hardness forming agents in the form of sugar derivatives, which usually are treated so as to maintain stable in sodium silicate solution.
- the invention is described in greater detail in the following by way of examples of the application, of the invention. It is to be observed that the heretofore usual amount of alkali silicate, calculated on the sand amount, is 3-5 % and more.
- a core box was heated to 150°C in a core shooter in a foundry for car material.
- a core mix was prepared of sand (mean grain size 0,25 mm) and 2,5 % of a binding agent according to above.
- the core mix was filled into the machine and the core was shot with such a pressure that a good packing degree was obtained, normally 400-700 kPa (4-7 kg/cm 2 ).
- the cores heathardened in the box for 20-60 seconds depending on the thickness (10-50 mm) whereafter they were ready for casting.
- the core manufacture was carried out according to 4).
- the binding agent was 3 % (by weight) pure sodium silicate 49°Be, ratio 2.7, and 1 % of a sugar derivative, i.e. the total binding agent amount was 4 %.
- the cores showed good surface hardness. The disintegration after casting, however, is somewhat worse than for 2), 3) and 4) according to above.
- the core manufacture was carried out according td 3), but with the addition of 7-10 % of an ester hardener of usual type. Hereby the core was dried through more rapidly, which is of value at the manufacture of large moulds/cores. It was found by experiments that the content of the surface-active substance should not exceed 0,1 % calculated on the amount of weight of material, and preferably it should lie within the range 0,0001-0,1 % .
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
Abstract
Method of manufacturing a foundry core or mould bound with alkali silicate. A surface-active substance is added at the mixing of the mould material, and the mould or core are heated moderately, i.e. to a temperature of between 110 C and 180 C.
Description
International Bureau
INTERNAΗONAL APPLICAΗON PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)
(51) International Patent Classification -: (11) International Publication Number: WO 80/01254
Al B22C 1/16, 9/12; C04B 19/04 (43) International Publication Date: 26 June 1980 (26.06.80)
(21) International Application Numbeπ PCT/SE79/00257 (74) Agents: AB STOCKHOLMS PATENTBYRA, ZACCO & BRUHN et al.; Box 3129, S-10362 Stockholm (SE).
(22) International Filing Date: 21 December 1979 (21.12.79)
(81) Designated States: DE, GB, JP, SU, US.
(31) Priority Application Numbers: 7813194-3 7907450-6
Published
(32) Priority Dates: 21 December 1978 (21.12.78) With international search report 7 September 1979 (07.09.79)
Publishedbefore the expiration of the time limitfor amending
(33) Priority Country: SE the claims and to be republished in the event of the receipt of amendments.
(71) Applicant (for all designated States except US): AHL-
SELL IR AB [SE/SE]; 27 Hammarbyvagen, S-10460 Stockholm (SE).
(72) Inventors; and
(75) Inventors/Applicants (for US only): AHLANDSBERG, Ingemar [SE/SE]; 17 Dalgangen, S-139 00 Varmdό (SE). PETERSSON, Lars-Erik [SE/SE]; 41 Bergviks- gatan, S-151 50 Sodertalje (SE).
(54) Title: A METHOD OF MANUFACTURING A FOUNDRY CORE OR MOULD OF GRANULAR AND/OR FIBROUS MATERIAL
(57) Abstract
Method of manufacturing a foundry core or mould bound with alkah silicate. A surface-active substance is adde at the mixing of the mould material, and the mould or core are heated moderately, i.e. to a temperature of between 1 lOoC and 180OC.
FOR THE PURPOSES OF INFORMATION ONLY
Codes used to identify States party to the PCT on the front pages of pamphlets publishing international appli- cations under the PCT.
AT Austria LI Liechtenstein
AU Australia LU Luxembourg
BR Brazil MC Monaco
CF Central African Republic MG Madagascar
CG Congo MW Malawi
CH Switzerland NL Netherlands
CM Cameroon NO Norway
DE Germany, Federal Republic of RO Romania
DK Denmark SE Sweden
BR France SN Senegal
GA Gabon su Soviet Union
GB United Kingdom TD Chad
HU Hungary TG Togo
JP Japan US United States of America
KP Democratic People's Republic of Korea
A method of manufacturing a foundry core o.r mould of granular and/or fibrous material
This invention relates to a method of manufacturing a foundry core or mould of granular and/or fibrous material with sodium silicate or potassium silicate as binding agent. Sodium or potassium silicate, hereinafter called alkali silicate, has been used for a long time at the manufacture of moulds and cores of, for example, sand in the foundry industry. The moulds and cores are quenched at room temperature by means of admixed hardeners or by blowing through with CO2. Such a manufacture, however, requires a relatively high binding agent content for achieving sufficient strength. Besides, the use of alkali silicate as binding agent involves several other disadvantages, of which .particularly the following ones may be mentioned:
Reduction of refractoriness of moulds and cores. Poor disintegration of moulds and cores after casting. Low recovery percentage of used core and mould material (moulding sand).
These disadvantages have heretofore limited the utilization of the alkali silikate at the manufacture of moulds or cores.
At the manufacture of cores with organic binding agents, usually resins, a material (for example some acid) is admixed to act as hardener and also the core boxes or cores are heated to a temperature between 250°C and 300°C. Cores manufactured in this way give rise to a substantial gas development both at the core manufacture and during the subsequent casting, thereby rendering the environment in such a foundry unfriendly. Moreover, such a core manufacture requires relatively much energy. The present invention has the object to reduce the aforesaid disadvantages and relates to a method of manufacturing a foundry core or mould of granular and/or fibrous material with. sodium silicate or potassium
silicate as binding agent. The invention is substantially characterized in that a surface-active substance is added at the mixing of the material, and that the core or mould is heated to between 110°C and 180°C. By adding according to the invention a surface-active substance to the mould material and by heating the core or mould to between 110°C and 180°C, it is possible to reduce the added amount of alkali silicate, compared with the amount conventionally used, without thereby decreasing the strength and surface hardness of the mould or core. This implies, that the moulds and cores still can be handled and stored without difficulty, and that the moulds and cores also show satisfactory resistance to heat and mechanic stresses during the casting. Due to the low alkali silicate content, the disintegration after the casting is very good. The casting, besides, is protective to the environment, because gases detrimental to health are produced only to a small extent. The radiation heat at the core manufacture is moderate, and the nergy consumption is low. Owing to its rapid procedure, the method renders possible series production above all of cores. To the mould or core material to be bound, liquid alkali silicate, ratio (molar ratio) SiO2/N 2O-0.5-3.5, in a relatively small amount and a surface-active substance in the form of a tenside, a silicone oil, silicone emulsion or siliconate are added.
In order to be able to keep the binding agent amount at minimum and to achieve optimum disintegration after the casting, for example a sodium silicate with certain additives is used, which latter are: a) Surface-active substances such as tensides, silicones (oils, emulsions) or siliconates (for example Berol 305®. Rhodorsil E55® and, respectively, Tegosivin®. b) Disintegration agents and surface-hardness forming agents in the form of sugar derivatives, which usually are treated so as to maintain stable in sodium silicate solution.
The invention is described in greater detail in the following by way of examples of the application, of the invention. It is to be observed that the heretofore usual amount of alkali silicate, calculated on the sand amount, is 3-5 % and more.
1) A mixture of sand and 1,5 % sodium silicate (ratio 2,7) calculated on the sand amount and 0,015 % silicone emulsion (35 %) was prepared. Of this mixture cylindric test bodies with the height 50 mm and the diameter 50 mm were manufactured. The test bodies were quenched at 150ºC and pressure tested after cooling. Compressive strengths of 500-600 N/cm2 were obtained. A zero test without silicone addition yielded compressive strengths o.f only 80-90 N/cm2. At a sodium silicate content of 2 % and 0,02 % silicone emulsion compressive strengths of about 800 N/cm2 were obtained while the zero test yielded about 550 N/cm2.
2) A core box was heated to 150°C in a core shooter in a foundry for car material. A core mix was prepared of sand (mean grain size 0,25 mm) and 2,5 % of a binding agent according to above. The core mix was filled into the machine and the core was shot with such a pressure that a good packing degree was obtained, normally 400-700 kPa (4-7 kg/cm2). The cores heathardened in the box for 20-60 seconds depending on the thickness (10-50 mm) whereafter they were ready for casting.
3) Core manufacture was carried out according to above. The cores, however, now were thicker and, therefore, also hot air (110-150°C) was blown through the core box. It was possible in this way to manufacture fully satisfactory cores within tess'than 60 seconds.
4) The core manufacture was carried out according to 3). The hot air, however , was here replaced by CO2-gas . Also in this way fully satisfactory cores could be manufactured. Heretofore this was not possible at the alkali silicate contents described above.
5) The core manufacture was carried out according
to 3), but a part of, the hot air was replaced by CO2. Fully satisfactory cores were obtained.
6) The core manufacture was carried out according to 4). Here, however, the binding agent was 3 % (by weight) pure sodium silicate 49°Be, ratio 2.7, and 1 % of a sugar derivative, i.e. the total binding agent amount was 4 %. The cores showed good surface hardness. The disintegration after casting, however, is somewhat worse than for 2), 3) and 4) according to above. 7) The core manufacture was carried out according td 3), but with the addition of 7-10 % of an ester hardener of usual type. Hereby the core was dried through more rapidly, which is of value at the manufacture of large moulds/cores. It was found by experiments that the content of the surface-active substance should not exceed 0,1 % calculated on the amount of weight of material, and preferably it should lie within the range 0,0001-0,1 % .
Claims
1. A method of manufacturing a foundry core or mould of granular and/or fibrous material with sodium silicate or potassium silicate as binding agent, c h a r a c t e ri z e d in that a surface-active substance is added at the mixing of the material, and that the core or mould are heated to between 110°C and 180°C.
2. A method as defined in claim 1, c h a r a c t e ri z e d in that the sodium or potassium silicate is added to the mixture of the material in an amount of 1 to 3 % calculated on the weight amount of material.
3. A method as defined in claim 1 or 2, c h a r a c t e r i z e d in that the surface-active substance is a tenside, silicone oil, silicone emulsion or siliconate.
4. A method as defined in any on of the claims 1-3, c h a r a c t e r i z e d in that the surface-active substance is added in an amount not exceeding 0,1 % calculated on the weight amount of material.
5. A method as defined in any one of the claims 1-4, c h a r a c t e r i z e d in that a core box is used which is heated to 110-180°C.
6. A method as defined in any one of the claims 1-5, c h a r a c t e r i z e d in that the core is blown through with hot air of a temperature of 110-180ºC.
7. A method as defined in any one of the claims 1-5, c h a r a c t e r i z e d in that the core is blown through with CO2 with or without supplementary through-blowing of hot air.
8. A method as defined in any one of the claims 5-7, c h a r a c t e r i z e d in that the core or mould is formed of core and, respectively, mould mass, to which an ester hardener was added.
9. A method as defined in any one of the preceding claims, c h a r a c t e r i z e d in that the sodium or potassium silicate has a molar ratio of between 2 and 3.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7813194 | 1978-12-21 | ||
SE7813194 | 1978-12-21 | ||
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 (1)
Publication Number | Publication Date |
---|---|
WO1980001254A1 true WO1980001254A1 (en) | 1980-06-26 |
Family
ID=26657178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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 |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPS6338254B2 (en) |
DE (1) | DE2953426C2 (en) |
FI (1) | FI64525C (en) |
GB (1) | GB2048735B (en) |
IT (1) | IT1126678B (en) |
NO (1) | NO151921C (en) |
WO (1) | WO1980001254A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5127461A (en) * | 1989-10-31 | 1992-07-07 | Ube Industries, Ltd. | Water soluble cores, process for producing them and process for die casting metal using them |
WO1995015229A1 (en) * | 1993-11-30 | 1995-06-08 | Borden (Uk) Limited | Foundry binder |
US6139619A (en) * | 1996-02-29 | 2000-10-31 | Borden Chemical, Inc. | Binders for cores and molds |
US6299677B1 (en) | 1996-06-25 | 2001-10-09 | Borden Chemical, Inc. | Binders for cores and molds |
WO2013159762A1 (en) | 2012-04-26 | 2013-10-31 | Ask Chemicals Gmbh | Method for producing moulds and cores for metal casting and moulds and cores produced according to this method |
US10232430B2 (en) | 2007-10-30 | 2019-03-19 | Ask Chemicals Gmbh | Mould material mixture having improved flowability |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
SE319582B (en) * | 1966-10-18 | 1970-01-19 | Mitsubishi Heavy Ind Ltd | |
GB1366705A (en) * | 1971-07-09 | 1974-09-11 | Foseco Int | Hardening of refractory/sodium silicate |
-
1979
- 1979-12-18 FI FI793967A patent/FI64525C/en not_active IP Right Cessation
- 1979-12-20 NO NO794187A patent/NO151921C/en unknown
- 1979-12-21 WO PCT/SE1979/000257 patent/WO1980001254A1/en unknown
- 1979-12-21 IT IT28350/79A patent/IT1126678B/en active
- 1979-12-21 DE DE19792953426 patent/DE2953426C2/en not_active Expired
- 1979-12-21 GB GB8026801A patent/GB2048735B/en not_active Expired
- 1979-12-21 JP JP55500148A patent/JPS6338254B2/ja not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
SE319582B (en) * | 1966-10-18 | 1970-01-19 | Mitsubishi Heavy Ind Ltd | |
GB1366705A (en) * | 1971-07-09 | 1974-09-11 | Foseco Int | Hardening of refractory/sodium silicate |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5127461A (en) * | 1989-10-31 | 1992-07-07 | Ube Industries, Ltd. | Water soluble cores, process for producing them and process for die casting metal using them |
WO1995015229A1 (en) * | 1993-11-30 | 1995-06-08 | Borden (Uk) Limited | Foundry binder |
US6139619A (en) * | 1996-02-29 | 2000-10-31 | Borden Chemical, Inc. | Binders for cores and molds |
US6299677B1 (en) | 1996-06-25 | 2001-10-09 | Borden Chemical, Inc. | Binders for cores and molds |
US10232430B2 (en) | 2007-10-30 | 2019-03-19 | Ask Chemicals Gmbh | Mould material mixture having improved flowability |
WO2013159762A1 (en) | 2012-04-26 | 2013-10-31 | Ask Chemicals Gmbh | Method for producing moulds and cores for metal casting and moulds and cores produced according to this method |
DE102012103705A1 (en) * | 2012-04-26 | 2013-10-31 | Ask Chemicals Gmbh | Method for producing molds and cores for casting metal, and molds and cores produced by this method |
Also Published As
Publication number | Publication date |
---|---|
JPS6338254B2 (en) | 1988-07-29 |
FI793967A (en) | 1980-06-22 |
FI64525C (en) | 1983-12-12 |
NO151921C (en) | 1985-07-10 |
NO794187L (en) | 1980-06-24 |
DE2953426T1 (en) | 1980-12-18 |
JPS55501134A (en) | 1980-12-18 |
IT7928350A0 (en) | 1979-12-21 |
GB2048735B (en) | 1983-03-09 |
DE2953426C2 (en) | 1987-03-12 |
GB2048735A (en) | 1980-12-17 |
IT1126678B (en) | 1986-05-21 |
NO151921B (en) | 1985-03-25 |
FI64525B (en) | 1983-08-31 |
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