EP0344225A1 - Process for manufacturing a casting mould. - Google Patents
Process for manufacturing a casting mould.Info
- Publication number
- EP0344225A1 EP0344225A1 EP88907601A EP88907601A EP0344225A1 EP 0344225 A1 EP0344225 A1 EP 0344225A1 EP 88907601 A EP88907601 A EP 88907601A EP 88907601 A EP88907601 A EP 88907601A EP 0344225 A1 EP0344225 A1 EP 0344225A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- molding material
- material mixture
- casting
- mold
- water
- 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.)
- Granted
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
- B22C1/162—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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH3608/87A CH675973A5 (en) | 1987-09-18 | 1987-09-18 | |
CH3608/87 | 1987-09-18 | ||
PCT/CH1988/000161 WO1989002325A1 (en) | 1987-09-18 | 1988-09-15 | Process for manufacturing a casting mould |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0344225A1 true EP0344225A1 (en) | 1989-12-06 |
EP0344225B1 EP0344225B1 (en) | 1994-08-17 |
Family
ID=4259648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88907601A Expired - Lifetime EP0344225B1 (en) | 1987-09-18 | 1988-09-15 | Process for manufacturing a casting mould |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0344225B1 (en) |
JP (1) | JPH02501204A (en) |
AT (1) | ATE110016T1 (en) |
CH (1) | CH675973A5 (en) |
DE (1) | DE3851143D1 (en) |
WO (1) | WO1989002325A1 (en) |
Family Cites Families (5)
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 (en) * | 1952-11-13 | 1958-05-22 | Gutehoffnungshuette Sterkrade | Process for the production of molded masks |
FR1322512A (en) * | 1962-05-02 | 1963-03-29 | Siemens Ag | Method and apparatus for constructing dimensionally stable foundry molds and cores from molding sands and binders |
FR1517167A (en) * | 1967-03-09 | 1968-03-15 | Usines Belges Vynckier Freres | Process for curing a sand-based composition and installation for carrying out this process |
JPS58100938A (en) * | 1981-12-11 | 1983-06-15 | Sintokogio Ltd | Molding method for mold |
-
1987
- 1987-09-18 CH CH3608/87A patent/CH675973A5/de not_active IP Right Cessation
-
1988
- 1988-09-15 AT AT88907601T patent/ATE110016T1/en not_active IP Right Cessation
- 1988-09-15 JP JP63507037A patent/JPH02501204A/en active Pending
- 1988-09-15 EP EP88907601A patent/EP0344225B1/en not_active Expired - Lifetime
- 1988-09-15 DE DE3851143T patent/DE3851143D1/en not_active Expired - Fee Related
- 1988-09-15 WO PCT/CH1988/000161 patent/WO1989002325A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO8902325A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH02501204A (en) | 1990-04-26 |
WO1989002325A1 (en) | 1989-03-23 |
DE3851143D1 (en) | 1994-09-22 |
CH675973A5 (en) | 1990-11-30 |
ATE110016T1 (en) | 1994-09-15 |
EP0344225B1 (en) | 1994-08-17 |
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