US681527A - Method of producing soft-metal castings. - Google Patents
Method of producing soft-metal castings. Download PDFInfo
- Publication number
- US681527A US681527A US4904101A US1901049041A US681527A US 681527 A US681527 A US 681527A US 4904101 A US4904101 A US 4904101A US 1901049041 A US1901049041 A US 1901049041A US 681527 A US681527 A US 681527A
- Authority
- US
- United States
- Prior art keywords
- metal
- mold
- castings
- stearic acid
- metal castings
- 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
- 238000000034 method Methods 0.000 title description 6
- 238000005058 metal casting Methods 0.000 title description 2
- 229910052751 metal Inorganic materials 0.000 description 26
- 239000002184 metal Substances 0.000 description 26
- 235000021355 Stearic acid Nutrition 0.000 description 10
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 10
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 10
- 239000008117 stearic acid Substances 0.000 description 10
- 238000005266 casting Methods 0.000 description 9
- 239000002253 acid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910001241 britannia metal Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000978 Pb alloy Inorganic materials 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 239000011507 gypsum plaster Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
Definitions
- the present invention relates to a process of making castings from soft metal, such as britannia metal or similar alloys composed mainly of tin or of lead.
- the present invention is based upon the discovery that stearic acid, if properly applied to the molten metal in the mold, will increase its uidity, probably by preventing or diminishing the oxidation, and will cause the metal to How in such manner as to properly fill all parts of the mold.
- the invention consists in exposing the molten metal to the action of stearic acid when running the metal into the mold, the said mold being composed of porous or absorptive material and having the portion forming and adjacent to the inner or pattern surface coated or impregnated with the acid.
- a mold for casting soft metal in accordance with this invention may be constructed in any usual manner, being made of porous absorptive material, such as plaster-of-paris or baked molding-sand, and in order that the metal may be properly subjected to the action of the stearic acid in the casting operation the inner surface of said mold is coated or impregnated with the acid. This may be done by Warming or slightly heating the parts of the mold, so as to thoroughly dry the same, and then applying stearic acid to the inner surfaces of the mold that are to come in contact with and give form to the metal.
- porous absorptive material such as plaster-of-paris or baked molding-sand
- the acid material will thus fill and impregnate the material of the mold adjacent to its internal surface, as indicated at a, Without affecting or changing the form of said surface and will act on the molten metal, which may be poured. into the mold in the usual manner and will cause the fluidity of the metal to be retained, so that it will readily iiow and completely and perfectly iill the cavity of the mold, thus resulting in the production of a sound and homogeneous casting havingahighly-nished surface.
- soft metal as herein employed l mean to include britannia, alloys of tin and lead, and similar metals or so-called metals or metallic compositions.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
G. H. BRABROOK.
Patented Aug. 27, |901.
METHD UFPRUDUCING SOFT METAL CASTINGS.
(Application led Peb. 27, 1901.)
NTTED STATES PATENT FFTCEQ GEORGE HALE BRABROOK, OF TAUNTON, MASSACHUSETTS.
METHOD OF PRODUCING SOFT-METAL CASTINGS.
SPECIFICATIGN forming part of Letters Patent N o. 681,527, dated August 27, 1901. Application tiled February 27, 1901. Serial No. 49|04l. (Specimens.)
To all whom t may concern:
Beit known that I, GEORGE HALE BRA- BROOK, of Taunton, county of Bristol, and State of Massachusetts, have invented an Improvement in Methods of Producing Soft- Metal Castings, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.
The present invention relates to a process of making castings from soft metal, such as britannia metal or similar alloys composed mainly of tin or of lead.
It has been found impracticable to make thin castings from britannia metal in the ordinary method of running the molten metal into a mold, because the metal will not sufficiently retain its fluidity, but by reason of chilling or oxidation ceases to flow, and thus fails to ll the mold so as to obtain perfect castings, especially where the article to be produced is of considerable extent, but of relatively small thickness or body, as is the case with hollow articles for tableware and the like, which are commonly made in whole or part from such alloys, but which are now commonly made by working up the sheet metal, because of the practical impossibility of producing satisfactory castings.
The present invention is based upon the discovery that stearic acid, if properly applied to the molten metal in the mold, will increase its uidity, probably by preventing or diminishing the oxidation, and will cause the metal to How in such manner as to properly fill all parts of the mold.
The invention consists in exposing the molten metal to the action of stearic acid when running the metal into the mold, the said mold being composed of porous or absorptive material and having the portion forming and adjacent to the inner or pattern surface coated or impregnated with the acid.
The accompanying drawing illustrates a mold in cross-section properly treated or prepared for the purposes of this invention.
A mold for casting soft metal in accordance with this invention may be constructed in any usual manner, being made of porous absorptive material, such as plaster-of-paris or baked molding-sand, and in order that the metal may be properly subjected to the action of the stearic acid in the casting operation the inner surface of said mold is coated or impregnated with the acid. This may be done by Warming or slightly heating the parts of the mold, so as to thoroughly dry the same, and then applying stearic acid to the inner surfaces of the mold that are to come in contact with and give form to the metal. The acid material will thus fill and impregnate the material of the mold adjacent to its internal surface, as indicated at a, Without affecting or changing the form of said surface and will act on the molten metal, which may be poured. into the mold in the usual manner and will cause the fluidity of the metal to be retained, so that it will readily iiow and completely and perfectly iill the cavity of the mold, thus resulting in the production of a sound and homogeneous casting havingahighly-nished surface. The result of the treatment of the metal indicates that some chemical action takes place between the hot metal and the stearic acid, this action probably involving the liberation of hydrogen which prevents or retards the oxidation of the metal, which oxidation takes place when the metal is not so treated and results in the solidifying or partially solidifyingof the metal, so that it will not flow and properly fill the cavity of the mold.
It is found in practice that a single coating of stearic acid will enable a mold to be used for several castings, and when it becomes insulicient to cause the metal toflow properly the mold may be supplied with a fresh coating of the stearic acid and again used until the eect thereof is exhausted.
Of the fat acids tried in the exploitation of this invention stearic acid of more or less perfect purity has been found most efficient; but it is within my invention to use a substitute for chemically pure stearic acid. Furthermore, by the term soft metal as herein employed l mean to include britannia, alloys of tin and lead, and similar metals or so-called metals or metallic compositions.
I elaimname to this specification in the presence of The method of producing a casting of soft two subscribing Witnesses.
metal which consists in impregnating the innersurface of a porous non-metallic mold GEORGE HALE BRABROOK 5 with stearic acid and running in the molten Witnesses:
metal. Jos. P. LIVERMORE,
In testimony whereof I have signed my NANCY P. FORD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4904101A US681527A (en) | 1901-02-27 | 1901-02-27 | Method of producing soft-metal castings. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4904101A US681527A (en) | 1901-02-27 | 1901-02-27 | Method of producing soft-metal castings. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US681527A true US681527A (en) | 1901-08-27 |
Family
ID=2750070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US4904101A Expired - Lifetime US681527A (en) | 1901-02-27 | 1901-02-27 | Method of producing soft-metal castings. |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US681527A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3410681A (en) * | 1965-09-28 | 1968-11-12 | Fur Tech Entwicklung Und Verwe | Composition for the treatment of steel |
-
1901
- 1901-02-27 US US4904101A patent/US681527A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3410681A (en) * | 1965-09-28 | 1968-11-12 | Fur Tech Entwicklung Und Verwe | Composition for the treatment of steel |
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