US3764575A - Salt core containing synthetic resin and water-glass as binders - Google Patents
Salt core containing synthetic resin and water-glass as binders Download PDFInfo
- Publication number
- US3764575A US3764575A US00052716A US3764575DA US3764575A US 3764575 A US3764575 A US 3764575A US 00052716 A US00052716 A US 00052716A US 3764575D A US3764575D A US 3764575DA US 3764575 A US3764575 A US 3764575A
- Authority
- US
- United States
- Prior art keywords
- core
- water
- percent
- weight
- synthetic resin
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
- 150000003839 salts Chemical group 0.000 title claims abstract description 32
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 235000019353 potassium silicate Nutrition 0.000 title claims abstract description 12
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 12
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 12
- 239000011230 binding agent Substances 0.000 title claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 3
- 229910001514 alkali metal chloride Inorganic materials 0.000 claims description 3
- 229910001617 alkaline earth metal chloride Inorganic materials 0.000 claims description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 150000001642 boronic acid derivatives Chemical class 0.000 claims description 2
- 239000007859 condensation product Substances 0.000 claims description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 2
- 239000012768 molten material Substances 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000006872 improvement Effects 0.000 abstract description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 235000012245 magnesium oxide Nutrition 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/105—Salt cores
Definitions
- ABSTRACT In the manufacture of a casting havmg a cavity, wherein a water-soluble salt core is suspended in a Foreign Applicatiml Priority Dam mold, molten material is poured into said mold about July 9, 1969 Germany P 19 34 787.6 1 said core, the molten material is allowed to harden to the desired casting, and the core is washed away with [52] U.S.
- the improvement 2 0/ 1 40 which comprises employing as said core one compris- [51] Int. Cl C088 51/04 ing a water-soluble salt, about 5 to 20 percent by Field Of Search R, 40; weight of watepglasg and about 2 to 15 percent by 43 weight of a synthetic resin as binder.
- the invention also extends to the core and the process by which it is [56] References Cited d UNITED STATES PATENTS 12/1970 Hill et al. 106/383 X 8 Claims, No Drawings SALT CORE CONTAINING SYNTHETIC RESIN AND WATER-GLASS AS BINDERS This invention relates to a water-soluble salt core for use in foundries.
- Cavities in castings are generally formed with the aid of sand cores. With cores which are difficultly accessible, the application of that method is limited because the complete removal of residues of the sand core after the casting operation is not always ensured. In view of these difficulties it is better to embed hollow cores of steel or copper in the casting and subsequently to remove the same by etching with nitric acid. That process too has serious disadvantages, which oppose its commercial application in foundries.
- a salt core composition comprising a watersoluble salt, about 5 to 20 percent by weight of waterglass and about 2 to 15 percent by weight of a synthetic resin as binder.
- the water-soluble salt which may range from about 65 to 93 percent and preferably from about 76 to 87 percent by weight of the composition, preferably comprises an alkali or alkaline earth metal chloride, sulfate or borate.
- the water-glass is preferably present in about 8 to 12 percent by weight.
- the synthetic resin binder advantageously comprises a condensation product based on furane or phenol and preferably is present in about 5 to 12% by weight.
- the salt core it is sufficient to ram the salt core composition according to the invention into a suitable core die and, in accordance with another feature of the invention, to cure the composition at a temperature of about to 150C.
- Cores so made may be subjected to the machining operations required for the mounting of such cores, such as thread cutting, milling or turning, without destruction of or damage to the cores.
- the salt core may be heated to a temperature of about 450 to 650C and preferably about 500 to 600C for a short time, e.g., for about 5 to 30 minutes and preferably for about 10 to 20 minutes, before it is thus embedded.
- a short time e.g., for about 5 to 30 minutes and preferably for about 10 to 20 minutes.
- carbonization of the synthetic resin binder occurs without undue reduction in the compressive and bending strengths of the salt cores.
- the salt core can be removed from the cavity by rinsing without difficulty and without need for special measures.
- the salt core is coated with a layer of water-glass in a thickness of up to 0.1 millimeter to ensure the formation of a smooth surface on the casting and to increase the compressive and bending strengths of the salt core. This is done before heating to 450 to 650C.
- 80 percent NaCl 11 percent water-glass and 9 percent synthetic resin is rammed into an annular core mold of wood and then cured in a drying oven at a temperature of C for 2 hours.
- the annular salt cores are then provided with tapped bores and milled planar surfaces.
- the salt core is heated at 550C for 15 minutes in an electrically heated air-circulating furnace embedded in an eutectic aluminum-silicon alloy melt. When the casting has been cooled, the salt core is dissolved out of the cavity, without leaving any residue, by passing cold water therethrough for 2 minutes.
- a core for use in making foundry castings having cavities comprising a water-soluble salt, about 5 to 20 percent by weight of water-glass and about 2 to 15 percent by weight of a synthetic resin as binder.
- a core according to claim 1 wherein said watersoluble salt is present in about 76 to 87 percent by weight and comprises one or more alkali or alkaline earth metal chlorides, sulfates or borates.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19691934787 DE1934787A1 (de) | 1969-07-09 | 1969-07-09 | Salzkern fuer Giessereizwecke |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3764575A true US3764575A (en) | 1973-10-09 |
Family
ID=5739305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00052716A Expired - Lifetime US3764575A (en) | 1969-07-09 | 1970-07-06 | Salt core containing synthetic resin and water-glass as binders |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3764575A (de) |
| JP (1) | JPS5013739B1 (de) |
| AT (1) | AT310364B (de) |
| DE (1) | DE1934787A1 (de) |
| FR (1) | FR2051614B1 (de) |
| GB (1) | GB1255907A (de) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3991811A (en) * | 1974-01-18 | 1976-11-16 | Karl Schmidt Gmbh | Process for manufacturing a light alloy piston having an annular cooling passage in its head portion |
| US5089186A (en) * | 1990-07-11 | 1992-02-18 | Advanced Plastics Partnership | Process for core removal from molded products |
| US5248552A (en) * | 1990-07-11 | 1993-09-28 | Advanced Plastics Partnership | Molding core |
| US5262100A (en) * | 1990-07-11 | 1993-11-16 | Advanced Plastics Partnership | Method of core removal from molded products |
| US5573055A (en) * | 1990-10-19 | 1996-11-12 | Borden (Uk) Limited | Water dispersible moulds |
| FR2819205A1 (fr) * | 2001-01-05 | 2002-07-12 | Renault | Noyau de fonderie a base de borates de potassium et procede de fabrication d'un tel noyau |
| DE10359547B3 (de) * | 2003-12-17 | 2005-03-03 | Emil Müller GmbH | Wasserlösliche Salzkerne |
| US7013948B1 (en) | 2004-12-01 | 2006-03-21 | Brunswick Corporation | Disintegrative core for use in die casting of metallic components |
| US20070000410A1 (en) * | 2003-02-11 | 2007-01-04 | Herbert Pitamitz | Coating materials for cores |
| WO2007036563A1 (de) * | 2005-09-30 | 2007-04-05 | Ceramtec Ag Innovative Ceramic Engineering | Kerne sowie ein verfahren zur herstellung von kernen |
| DE102006031532B3 (de) * | 2006-07-07 | 2008-04-17 | Emil Müller GmbH | Wasserlöslicher Salzkern mit Funktionsbauteil |
| DE102008039208A1 (de) | 2008-08-20 | 2009-02-12 | Heppes, Frank, Dipl.-Ing. | Urformkerne zur Herstellung umfangreich konturierter, hinterschnittener Hohlräume in Urformteilen, damit hergestellte Urformteile sowie Verfahren zur Herstellung, Anwendung und Entfernung der Kerne |
| WO2010133596A3 (de) * | 2009-05-18 | 2011-02-03 | Ceramtec Gmbh | Kerne auf der basis von salz mit behandelter oberfläche |
| CN107262661A (zh) * | 2017-05-23 | 2017-10-20 | 厦门建霖工业有限公司 | 一种耐高温高强度水溶性型芯及其制备方法 |
| EP3024610B1 (de) | 2013-07-24 | 2018-11-21 | Emil Müller GmbH | Salzkerne und generative fertigungsverfahren zur herstellung von salzkernen |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4462453A (en) * | 1979-06-04 | 1984-07-31 | Deere & Company | Casting methods with composite molded core assembly |
| WO1996015866A1 (en) * | 1994-11-21 | 1996-05-30 | Pechiney Recherche (G.I.E.) | Ceramic core for investment casting and method for preparation of the same |
| DE10312782B4 (de) * | 2003-03-21 | 2005-05-04 | Emil Müller GmbH | Wasserlösliche Salzkerne und Verfahren zur Herstellung wasserlöslicher Salzkerne |
| DE102007009274A1 (de) | 2007-02-26 | 2008-08-28 | Daimler Ag | Wasserlösliche Gießkerne für den Leichtmetallguss |
| US20160158831A1 (en) * | 2013-07-24 | 2016-06-09 | Emil Müller GmbH | Salt cores and additive manufacturing method for producing salt cores |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2712533A (en) * | 1950-10-23 | 1955-07-05 | Borden Co | Lamp basing cement containing sodium silicate-magnesium oxide bonding mixture |
| US3179523A (en) * | 1960-11-21 | 1965-04-20 | Mo Och Domsjoe Ab | Methods of making foundry cores and moulds |
| US3385345A (en) * | 1966-03-04 | 1968-05-28 | Ashland Oil Inc | Method of making rapid curing foundry cores |
| US3548914A (en) * | 1966-06-06 | 1970-12-22 | Wellworthy Ltd | Soluble core fabrication |
| US3550670A (en) * | 1968-01-11 | 1970-12-29 | North American Rockwell | Mold manufacturing method |
| US3645491A (en) * | 1969-07-22 | 1972-02-29 | Aeroplane Motor Aluminum Casti | Soluble metal casting cores comprising a water-soluble salt and a synthetic resin |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH414070A (de) * | 1964-03-12 | 1966-05-31 | Sulzer Ag | Verfahren zum Herstellen eines in der Form zerstörbaren Giessereimodells |
| FR1526465A (fr) * | 1966-06-06 | 1968-05-24 | Wellworthy Ltd | Noyaux solubles de moulage |
-
1969
- 1969-07-09 DE DE19691934787 patent/DE1934787A1/de active Pending
-
1970
- 1970-06-27 JP JP45056411A patent/JPS5013739B1/ja active Pending
- 1970-07-01 FR FR7024434A patent/FR2051614B1/fr not_active Expired
- 1970-07-02 AT AT599070A patent/AT310364B/de not_active IP Right Cessation
- 1970-07-06 US US00052716A patent/US3764575A/en not_active Expired - Lifetime
- 1970-07-07 GB GB32992/70A patent/GB1255907A/en not_active Expired
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2712533A (en) * | 1950-10-23 | 1955-07-05 | Borden Co | Lamp basing cement containing sodium silicate-magnesium oxide bonding mixture |
| US3179523A (en) * | 1960-11-21 | 1965-04-20 | Mo Och Domsjoe Ab | Methods of making foundry cores and moulds |
| US3385345A (en) * | 1966-03-04 | 1968-05-28 | Ashland Oil Inc | Method of making rapid curing foundry cores |
| US3548914A (en) * | 1966-06-06 | 1970-12-22 | Wellworthy Ltd | Soluble core fabrication |
| US3550670A (en) * | 1968-01-11 | 1970-12-29 | North American Rockwell | Mold manufacturing method |
| US3645491A (en) * | 1969-07-22 | 1972-02-29 | Aeroplane Motor Aluminum Casti | Soluble metal casting cores comprising a water-soluble salt and a synthetic resin |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3991811A (en) * | 1974-01-18 | 1976-11-16 | Karl Schmidt Gmbh | Process for manufacturing a light alloy piston having an annular cooling passage in its head portion |
| US5089186A (en) * | 1990-07-11 | 1992-02-18 | Advanced Plastics Partnership | Process for core removal from molded products |
| AU639116B2 (en) * | 1990-07-11 | 1993-07-15 | Advanced Plastics Partnership | Core removal from molded products |
| US5248552A (en) * | 1990-07-11 | 1993-09-28 | Advanced Plastics Partnership | Molding core |
| US5262100A (en) * | 1990-07-11 | 1993-11-16 | Advanced Plastics Partnership | Method of core removal from molded products |
| USRE35334E (en) * | 1990-07-11 | 1996-09-24 | Advanced Plastics Partnership | Process for core removal from molded products |
| US5573055A (en) * | 1990-10-19 | 1996-11-12 | Borden (Uk) Limited | Water dispersible moulds |
| FR2819205A1 (fr) * | 2001-01-05 | 2002-07-12 | Renault | Noyau de fonderie a base de borates de potassium et procede de fabrication d'un tel noyau |
| US7717994B2 (en) * | 2003-02-11 | 2010-05-18 | Ashland-Sudchemie-Kernfest Gmbh | Coating materials for cores |
| US20070000410A1 (en) * | 2003-02-11 | 2007-01-04 | Herbert Pitamitz | Coating materials for cores |
| DE10359547B3 (de) * | 2003-12-17 | 2005-03-03 | Emil Müller GmbH | Wasserlösliche Salzkerne |
| WO2005058527A1 (de) | 2003-12-17 | 2005-06-30 | Emil Müller GmbH | Wasserlösliche salzkerne |
| US20070036941A1 (en) * | 2003-12-17 | 2007-02-15 | Emil Muller Gmbh | Water-soluble salt cores |
| US8403028B2 (en) * | 2003-12-17 | 2013-03-26 | Kolbenschmidt Aluminum Technologie GmbH | Water-soluble salt cores |
| US20120132785A1 (en) * | 2003-12-17 | 2012-05-31 | Kolbenschmidt Aluminium Technologie Gmbh | Water-soluble salt cores |
| US7013948B1 (en) | 2004-12-01 | 2006-03-21 | Brunswick Corporation | Disintegrative core for use in die casting of metallic components |
| US20090250587A1 (en) * | 2005-09-30 | 2009-10-08 | Kaefer Dieter | Core and a Method for the Production Thereof |
| WO2007036563A1 (de) * | 2005-09-30 | 2007-04-05 | Ceramtec Ag Innovative Ceramic Engineering | Kerne sowie ein verfahren zur herstellung von kernen |
| DE102006031532B3 (de) * | 2006-07-07 | 2008-04-17 | Emil Müller GmbH | Wasserlöslicher Salzkern mit Funktionsbauteil |
| DE102008039208A1 (de) | 2008-08-20 | 2009-02-12 | Heppes, Frank, Dipl.-Ing. | Urformkerne zur Herstellung umfangreich konturierter, hinterschnittener Hohlräume in Urformteilen, damit hergestellte Urformteile sowie Verfahren zur Herstellung, Anwendung und Entfernung der Kerne |
| WO2010133596A3 (de) * | 2009-05-18 | 2011-02-03 | Ceramtec Gmbh | Kerne auf der basis von salz mit behandelter oberfläche |
| EP3024610B1 (de) | 2013-07-24 | 2018-11-21 | Emil Müller GmbH | Salzkerne und generative fertigungsverfahren zur herstellung von salzkernen |
| CN107262661A (zh) * | 2017-05-23 | 2017-10-20 | 厦门建霖工业有限公司 | 一种耐高温高强度水溶性型芯及其制备方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2051614A1 (de) | 1971-04-09 |
| GB1255907A (en) | 1971-12-01 |
| DE1934787A1 (de) | 1971-01-14 |
| FR2051614B1 (de) | 1974-08-09 |
| AT310364B (de) | 1973-09-25 |
| JPS5013739B1 (de) | 1975-05-22 |
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