WO1989002325A1 - Process for manufacturing a casting mould - Google Patents
Process for manufacturing a casting mould Download PDFInfo
- Publication number
- WO1989002325A1 WO1989002325A1 PCT/CH1988/000161 CH8800161W WO8902325A1 WO 1989002325 A1 WO1989002325 A1 WO 1989002325A1 CH 8800161 W CH8800161 W CH 8800161W WO 8902325 A1 WO8902325 A1 WO 8902325A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- molding material
- material mixture
- casting
- mold
- water
- Prior art date
Links
- 238000005266 casting Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000012778 molding material Substances 0.000 claims description 13
- 239000006004 Quartz sand Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 5
- 239000004576 sand Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 2
- 239000001569 carbon dioxide Substances 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- 239000000654 additive Substances 0.000 description 5
- 238000012958 reprocessing Methods 0.000 description 3
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003958 fumigation Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000126 substance 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
- B22C1/162—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 use of a gaseous treating agent for hardening the binder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
Definitions
- the present invention relates to a method for producing a casting mold in the manner of a block mold, from a granular molding material mixture, for casting preferably coreless castings, and casting molds produced by the method.
- the known molding processes such as shaking, pressing, blowing, shooting or high-pressure pressing, have in common that molding materials with additives such as bentonite are used. Since the old sand accumulated when the castings are emptied is reused and must therefore be processed accordingly, any type of additive in the molding material - for the process of reprocessing - is problematic.
- the object of the present invention is to propose a method for producing a casting mold from a granular molding material mixture, in which there are no reactive additives to the liquid metal.
- the casting mold produced by the process should be environmentally friendly and easy to process.
- quartz sand is first mixed with water glass, the water glass serving as a binder. Fumigation with carbonic acid rapidly solidifies the molding material. Silica gels are formed with the elimination of water, which firmly bind the quartz sand.
- the bonding introduced by the carbon dioxide allows the mold to be separated from the model without damage.
- the pourable final hardness is set by exposure to microwaves.
- a casting mold 1 according to the invention has molded parts 2 and 3 modeled on both sides with cavities already molded. Several such molds are produced for series production, two of them each be pushed together in a block so that a complete casting cavity is created. This not only brings optimal use of the shape, but also leads to economical series production.
- Directional solidification can be achieved by providing cooling bores 4 which can be supplied with air as the cooling medium.
- Sand with the designation M36 and 5% water glass (e.g. Kernex) was used for the mold production. After carbonation, the molds were placed in the microwave oven. The oven was operated for 5 minutes at a power level that corresponds to an energy output of about 700 watts. Loss of water has increased the form strength.
- the mold After the casting and solidification of the metal in the mold, the mold can be dissolved in water. The castings are then cleaned by blasting. The lowering of the mold in the water can be carried out in various stages, which means that a change in the structure of the casting can be avoided or set in a targeted manner.
- the sand detached in the water is fed to the reprocessing after drying, whereby this reprocessing can be carried out in an environmentally friendly process without additional manipulations, since no additives are used, e.g. Bentonite, coal dust or other additives.
- the mold produced in the proposed way is very high. Has solidity, there is no feeder for gray-rigid materials.
- the cast body cast in this form has a good surface due to the low penetration.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3851143T DE3851143D1 (de) | 1987-09-18 | 1988-09-15 | Verfahren zur herstellung einer giessform. |
| EP88907601A EP0344225B1 (de) | 1987-09-18 | 1988-09-15 | Verfahren zur herstellung einer giessform |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH3608/87A CH675973A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1987-09-18 | 1987-09-18 | |
| CH3608/87-0 | 1987-09-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1989002325A1 true WO1989002325A1 (en) | 1989-03-23 |
Family
ID=4259648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CH1988/000161 WO1989002325A1 (en) | 1987-09-18 | 1988-09-15 | Process for manufacturing a casting mould |
Country Status (6)
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB745402A (en) * | 1952-07-09 | 1956-02-22 | Wilhelm Schmidt | Improvements in or relating to a process for the production of moulds and cores for foundry purposes |
| DE1030525B (de) * | 1952-11-13 | 1958-05-22 | Gutehoffnungshuette Sterkrade | Verfahren zur Herstellung von Formmasken |
| FR1322512A (fr) * | 1962-05-02 | 1963-03-29 | Siemens Ag | Procédé et dispositif de construction de moules et noyaux de fonderie à dimensions stables à partir de sables de moulage et de liants |
| FR1517167A (fr) * | 1967-03-09 | 1968-03-15 | Usines Belges Vynckier Freres | Procédé de durcissement d'une composition à base de sable et installation pour lamise en oeuvre de ce procédé |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58100938A (ja) * | 1981-12-11 | 1983-06-15 | Sintokogio Ltd | 鋳型造型方法 |
-
1987
- 1987-09-18 CH CH3608/87A patent/CH675973A5/de not_active IP Right Cessation
-
1988
- 1988-09-15 WO PCT/CH1988/000161 patent/WO1989002325A1/de active IP Right Grant
- 1988-09-15 DE DE3851143T patent/DE3851143D1/de not_active Expired - Fee Related
- 1988-09-15 JP JP63507037A patent/JPH02501204A/ja active Pending
- 1988-09-15 AT AT88907601T patent/ATE110016T1/de not_active IP Right Cessation
- 1988-09-15 EP EP88907601A patent/EP0344225B1/de not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB745402A (en) * | 1952-07-09 | 1956-02-22 | Wilhelm Schmidt | Improvements in or relating to a process for the production of moulds and cores for foundry purposes |
| DE1030525B (de) * | 1952-11-13 | 1958-05-22 | Gutehoffnungshuette Sterkrade | Verfahren zur Herstellung von Formmasken |
| FR1322512A (fr) * | 1962-05-02 | 1963-03-29 | Siemens Ag | Procédé et dispositif de construction de moules et noyaux de fonderie à dimensions stables à partir de sables de moulage et de liants |
| FR1517167A (fr) * | 1967-03-09 | 1968-03-15 | Usines Belges Vynckier Freres | Procédé de durcissement d'une composition à base de sable et installation pour lamise en oeuvre de ce procédé |
Non-Patent Citations (2)
| Title |
|---|
| Patent Abstracts of Japan, Band 7, Nr. 211 (M-243)(1356), 17. September 1983; & JP-A-58107250 (KOMATSU SEISAKUSHO K.K.) 25. Juni 1983 * |
| Patent Abstracts of Japan, Band 9, Nr. 209 (M-407)(1932), 27. August 1985; & JP-A-6068133 (KOMATSU SEISAKUSHO K.K.) 18. Apil 1985 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE110016T1 (de) | 1994-09-15 |
| JPH02501204A (ja) | 1990-04-26 |
| EP0344225B1 (de) | 1994-08-17 |
| CH675973A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1990-11-30 |
| DE3851143D1 (de) | 1994-09-22 |
| EP0344225A1 (de) | 1989-12-06 |
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