US2583533A - Method of destroying patterns - Google Patents
Method of destroying patterns Download PDFInfo
- Publication number
- US2583533A US2583533A US778042A US77804247A US2583533A US 2583533 A US2583533 A US 2583533A US 778042 A US778042 A US 778042A US 77804247 A US77804247 A US 77804247A US 2583533 A US2583533 A US 2583533A
- Authority
- US
- United States
- Prior art keywords
- oxygen
- casting
- model
- compound
- burning
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
- B22C7/023—Patterns made from expanded plastic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/448—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles destructible
Definitions
- This invention relates to a method of casting various castable materials. It is adapted to be used particularly in casting metals and metal alloys but the invention may also be used in casting other castable materials which set upon casting.
- While casting the material to be cast is poured into a sand mold, said sand mold being obtained by means of a model.
- the model requires thorough and accurate operation.
- the models are generally made of wood and are built up from several parts which are required to fit one another so that after the sand mold is made they are adapted to be removed therefrom. It is obvious that very much care must be bestowed upon the manufacture of such models and this renders the models very expensive. If a casting model is required to be quickly available the method hitherto adopted is inconvenient. If the model serves for the manufacture of only one or some few castings the cost of the model is comparatively high.
- the invention has for its object to obviate these difllculties.
- a casting mold or a casting model is modelled entirely or in part from combustible material which is adapted to burn entirely or substantially entirely without access of air oxygen and without leaving any substantial ash-residue.
- Such a casting model is used to make mold in the usual manner by means of sand or the like.
- the combustible model is provided with a projecting part adapted to be approached and ignited from the outside. In practice a projecting part of about cm. sufiices to enable casting.
- a model according to the invention is adapted to be readily formed, for example by modelling, and there is no objection to its having the most capricious and irregular forms.
- a great advantage is that the model may be in one piece. In such cases a casting model is obtained which is made entirely from the combustible material referred to. It is however also possible for the casting model to be made from the combustible material only in part and this has particular advantages in the case of large casting models. They may be built up from thin wood or other combustible material which is coated with the combustible material required to be used in accordance with the invention. The wood may be soaked with combustible material.
- the combustible material to be used may be constituted by charcoal with a nitrate, for example ammonium nitrate.
- a nitrate for example ammonium nitrate.
- the latter gives 011 the required oxygen which is necessary for causing the charcoal to be burnt.
- a binder may be constituted by resin or synthetic resin, or an organic product comparable therewith, for example shellac.
- the model contains only organic products and inorganic substances that leave no salt residues.
- ammonium nitrate is highly suited.
- Combustible substances and mixtures of the kind required to be used in accordance with the invention are known in the pyro-technical industry. Slowly burning mixtures of this kind are used, for example, for fuses. In addition, timing in shells is effected by a slowly burning priming circle.
- the combustion gases may escape through the channel or the cavities which are produced by the combustion of the model from the outside.
- the low deposition of soot that may take place in the interior of the casting mold is not ⁇ inconvenient and: has even advantages while casting.
- a suitable choice of the components of the model permits of controlling the speed of combustion.
- a casting mould made with a pattern of a substance essentially comprising a material which combines with oxygen in an exothermic reaction and whose oxidation products are primarily gaseous, an oxygen-combustible binder and a normally stable, solid, oxygen-rich. compound which is unstable at temperatures below the temperature of said exothermic reaction, said compound being present in an amount sufficient fully to combust said material and said binder. and burning said substance within said mold, the oxygen for burning being supplied by said compound, whereby to leave a mold cavity.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Description
Patented Jan. 29, 1952 METHOD OF DESTROYING' PATTERNS J ohannes Nathanael Hiensch, Eindhoven, Netherlands No Drawing. Application October 4, 1947, Serial No. 778,042. In the Netherlands April 17, 1945 Section 1, Public Law 690, August 8, 1946 Patent expires April 17, 1965 Claims. (Cl. 22-198) This invention relates to a method of casting various castable materials. It is adapted to be used particularly in casting metals and metal alloys but the invention may also be used in casting other castable materials which set upon casting.
While casting the material to be cast is poured into a sand mold, said sand mold being obtained by means of a model. Particularly in the case of intricate moldings the model requires thorough and accurate operation. The models are generally made of wood and are built up from several parts which are required to fit one another so that after the sand mold is made they are adapted to be removed therefrom. It is obvious that very much care must be bestowed upon the manufacture of such models and this renders the models very expensive. If a casting model is required to be quickly available the method hitherto adopted is inconvenient. If the model serves for the manufacture of only one or some few castings the cost of the model is comparatively high.
The invention has for its object to obviate these difllculties. According to the invention a casting mold or a casting model is modelled entirely or in part from combustible material which is adapted to burn entirely or substantially entirely without access of air oxygen and without leaving any substantial ash-residue. Such a casting model is used to make mold in the usual manner by means of sand or the like. The combustible model is provided with a projecting part adapted to be approached and ignited from the outside. In practice a projecting part of about cm. sufiices to enable casting.
A model according to the invention is adapted to be readily formed, for example by modelling, and there is no objection to its having the most capricious and irregular forms. Alternatively, it is possible previously to make a block from the combustible model-material and to give to this block the desired shape by turning or other operations, which may be effected when the form of the model is required to be more regular from a geometrical viewpoint. A great advantage is that the model may be in one piece. In such cases a casting model is obtained which is made entirely from the combustible material referred to. It is however also possible for the casting model to be made from the combustible material only in part and this has particular advantages in the case of large casting models. They may be built up from thin wood or other combustible material which is coated with the combustible material required to be used in accordance with the invention. The wood may be soaked with combustible material.
The combustible material to be used may be constituted by charcoal with a nitrate, for example ammonium nitrate. The latter gives 011 the required oxygen which is necessary for causing the charcoal to be burnt. A binder may be constituted by resin or synthetic resin, or an organic product comparable therewith, for example shellac.
Care should preferably be taken that the model contains only organic products and inorganic substances that leave no salt residues. In this connection ammonium nitrate is highly suited.
Combustible substances and mixtures of the kind required to be used in accordance with the invention are known in the pyro-technical industry. Slowly burning mixtures of this kind are used, for example, for fuses. In addition, timing in shells is effected by a slowly burning priming circle.
In the use of the invention, during combustion, the combustion gases may escape through the channel or the cavities which are produced by the combustion of the model from the outside. The low deposition of soot that may take place in the interior of the casting mold is not \inconvenient and: has even advantages while casting.
A suitable choice of the components of the model permits of controlling the speed of combustion.
What I claim is:
1. In a method of casting metals, that improvement which includes the steps of providing a casting mould made with a pattern of a substance essentially comprising a material which combines with oxygen in an exothermic reaction and whose oxidation products are primarily gaseous, an oxygen-combustible binder and a normally stable, solid, oxygen-rich. compound which is unstable at temperatures below the temperature of said exothermic reaction, said compound being present in an amount sufficient fully to combust said material and said binder. and burning said substance within said mold, the oxygen for burning being supplied by said compound, whereby to leave a mold cavity.
2. A method as set forth in claim 1 wherein a portion of the pattern is extended beyond the mould and is ignited to start the burning.
3. A method as set forth in claim 1 wherein the substance is plastic.
4. A method as set forth in clim 1 wherein UNITED STATES PATENTS the material is charcoal, the binder is a resin i Number Name Date and the compound is a nitrate. 1 583 459 Hansen May 1926. 5. A method as set forth in claim 1 wherein 1856419 McRae May 1932 the pattern is thin wood coated with charcoal, 2351919 Bright 1944 nitrate and a resin" 2:362:50? Steinboeh et Z1: J. Nov. 141 1944 JOHANNES NATHANAEL HIENSCH' 2,393,594 Davis Jan, 2 194 REFERENCES CITED The following references are of f'ecord in the 10 file of this patent:
Claims (1)
1. IN A METHOD OF CASTING METALS, THAT IMPROVEMENT WHICH INCLUDES THE STEPS OF PROVIDING A CASTING MOULD MEAD WITH A PATTERN OF A SUBSTANCE ESSENTIALLY COMPRISING A MATERIAL WHICH COMBINES WITH OXYGEN IN AN EXOTHERMIC REACTION AND WHOSE OXIDATION PRODUCTS ARE PRIMARILY GASEOUS, AN OXYGEN-COMBUSTIBLE BINDER AND A NORMALLY STABLE, SOLID, OXYGEN-RICH COMPOUND WHICH IS UNSTABLE AT TEMPERATURES BELOW THE TEMPERATURE OF SAID EXOTHERMIC REACTION, SAID COMPOUND BEING PRESENT IN AN AMOUNT SUFFICIENT FULLY TO COMBUST SAID MATERIAL AND SAID BINDER, AND BURNING SAID SUBSTANCE WITHIN SAID MOLD, THE OXYGEN FOR BURNING BEING SUPPLIED BY SAID COMPOUND, WHEREBY TO LEAVE A MOLD CAVITY.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL2583533X | 1945-04-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2583533A true US2583533A (en) | 1952-01-29 |
Family
ID=19874864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US778042A Expired - Lifetime US2583533A (en) | 1945-04-17 | 1947-10-04 | Method of destroying patterns |
Country Status (3)
Country | Link |
---|---|
US (1) | US2583533A (en) |
BE (1) | BE475874A (en) |
NL (1) | NL62872C (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2830343A (en) * | 1956-04-26 | 1958-04-15 | Harold F Shroyer | Cavityless casting mold and method of making same |
US2871528A (en) * | 1954-09-01 | 1959-02-03 | Kolcast Ind Inc | Method of and apparatus for forming frangible casting molds |
US2944338A (en) * | 1953-12-30 | 1960-07-12 | Gen Electric | Spray metal process for making precision articles |
US3144323A (en) * | 1959-05-01 | 1964-08-11 | Foseco Int | Treatment of molten light alloys |
US3314116A (en) * | 1962-04-02 | 1967-04-18 | Full Mold Process Inc | Gasifiable casting pattern |
US4240492A (en) * | 1978-10-23 | 1980-12-23 | Nibco, Inc. | Process of forming multi piece vaporizable pattern for foundry castings |
US4743462A (en) * | 1986-07-14 | 1988-05-10 | United Technologies Corporation | Method for preventing closure of cooling holes in hollow, air cooled turbine engine components during application of a plasma spray coating |
US9206499B2 (en) | 2010-08-30 | 2015-12-08 | United Technologies Corporation | Minimizing blockage of holes in turbine engine components |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1583459A (en) * | 1925-04-28 | 1926-05-04 | Thomas C Hansen | Pin form for crowns and the like |
US1856419A (en) * | 1927-06-18 | 1932-05-03 | Anna Catherine Frisbey | Safety combination fuse tip |
US2351919A (en) * | 1942-07-16 | 1944-06-20 | Plastie Veneering Inc | Method of coating wooden patterns |
US2362507A (en) * | 1942-10-27 | 1944-11-14 | Steinbock | Method and means for producing commercial castings |
US2393594A (en) * | 1941-07-08 | 1946-01-29 | Du Pont | Operation of internal-combustion engines |
-
0
- NL NL62872D patent/NL62872C/xx active
- BE BE475874D patent/BE475874A/xx unknown
-
1947
- 1947-10-04 US US778042A patent/US2583533A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1583459A (en) * | 1925-04-28 | 1926-05-04 | Thomas C Hansen | Pin form for crowns and the like |
US1856419A (en) * | 1927-06-18 | 1932-05-03 | Anna Catherine Frisbey | Safety combination fuse tip |
US2393594A (en) * | 1941-07-08 | 1946-01-29 | Du Pont | Operation of internal-combustion engines |
US2351919A (en) * | 1942-07-16 | 1944-06-20 | Plastie Veneering Inc | Method of coating wooden patterns |
US2362507A (en) * | 1942-10-27 | 1944-11-14 | Steinbock | Method and means for producing commercial castings |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2944338A (en) * | 1953-12-30 | 1960-07-12 | Gen Electric | Spray metal process for making precision articles |
US2871528A (en) * | 1954-09-01 | 1959-02-03 | Kolcast Ind Inc | Method of and apparatus for forming frangible casting molds |
US2830343A (en) * | 1956-04-26 | 1958-04-15 | Harold F Shroyer | Cavityless casting mold and method of making same |
US3144323A (en) * | 1959-05-01 | 1964-08-11 | Foseco Int | Treatment of molten light alloys |
US3314116A (en) * | 1962-04-02 | 1967-04-18 | Full Mold Process Inc | Gasifiable casting pattern |
US4240492A (en) * | 1978-10-23 | 1980-12-23 | Nibco, Inc. | Process of forming multi piece vaporizable pattern for foundry castings |
US4743462A (en) * | 1986-07-14 | 1988-05-10 | United Technologies Corporation | Method for preventing closure of cooling holes in hollow, air cooled turbine engine components during application of a plasma spray coating |
US9206499B2 (en) | 2010-08-30 | 2015-12-08 | United Technologies Corporation | Minimizing blockage of holes in turbine engine components |
Also Published As
Publication number | Publication date |
---|---|
NL62872C (en) | |
BE475874A (en) |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2583533A (en) | Method of destroying patterns | |
ES8105595A1 (en) | Foundry core for producing hardly accessible hollow cavities in casting pieces, and process for its manufacture. | |
US1912889A (en) | Method of producing metallic dies | |
US2530853A (en) | Method of casting | |
ES472801A1 (en) | Investment casting method for making a desired casting | |
GB1371572A (en) | Method of manufacturing an article constructed from two separate metal parts such as an article of jewellery | |
DE817187C (en) | Model for casting, especially of metals and metal alloys | |
JPS5656756A (en) | Mold for precision casting and its production | |
SU603483A1 (en) | Method of making ceramic casting moulds with use of removable patterns | |
ES430585A1 (en) | Production of casting moulds | |
US1704384A (en) | Casting magnesium and alloy thereof | |
RU2771419C1 (en) | Suspension for the front layer of the ceramic mold for casting on heat-removable models | |
FR2325449A1 (en) | Mfr. of moulds for casting high melting metals - by forming a graphite compsn. around a water-soluble model | |
US20030041992A1 (en) | Rapid investment casting or molding method | |
JPS5843169B2 (en) | Resin coated sand | |
US3208115A (en) | Investment molding | |
US142790A (en) | Improvement in cores for casting metals | |
JPH06142820A (en) | Resin sand and parting material for shell mold method | |
SU501835A1 (en) | A METHOD FOR REMOVING A MODEL COMPOSITION OF A CERAMIC SHAPED FORM IN THE MANUFACTURE OF CASTING ON A MOLDED MODELS1 improving the quality of ceramic shells and sanitary-hygienic working conditions. There is a well-known method of melting a model composition from ceramic shells in liquid Yu media, according to which Which medium for melting, which is simultaneously a heat carrier, is known a composition for removing model material 1 [from ceramic forms, including a mixture of glycols and 15 carbitol. A well-known method is that models are made of a low-melting model material (for example, composition P-3) and collect them in blocks. On the assembled model blocks, apply the required number of layers of a refractory coating based on a binder hydrolyzed solution of ethyl silicate and with them in an exothermic ammonia atmosphere. After the act !! All the layers of the block — o are transported by the condom to the bath for the smelting of models. when heated to a temperature above the melt of the moling composition with a liquid, for example, a mixture of glycols and carbitol, the blocks in this mixture are kept for the time necessary for the complete removal of the models from the cavity, and then the forms are transported to the next operation. The disadvantage of this method is the following: —When using shell forms of glass glass or a hydrolyzed solution of ethyl silicate as a binder, around the shell form, immersed in a model bath, forms with an area with high pH (pH). If the models are melted in high-boiling organic liquids, such as mixtures of glycols and carb'Itol, then at high pH the medium will produce slow-burning tar-like products, which accumulate the oxidation products of the bath material, as well as sand particles, etc. Getting into the internal cavity of the mold, these products cause incomplete burning of combustible during annealing, resulting in the rejection of castings due to insufficient heat, gas shells and clogs. At the time of removing the ceramic shells from the installation, they have a high temperature y (about SO' ^ C) and reduced proch- | |
RU2051008C1 (en) | Method of manufacturing special ingots according to removable patterns | |
CN105014011A (en) | Precision casting magnesium alloy mould housing preparation process | |
PL65489B1 (en) | ||
SU87909A1 (en) | Method of making molds for the production of wax products in them in precision casting | |
JPS6228044A (en) | Manufacture of casting mold | |
JPS63286243A (en) | Lost foam pattern having member for hole as cast |