US570919A - Process of annealing metal castings - Google Patents
Process of annealing metal castings Download PDFInfo
- Publication number
- US570919A US570919A US570919DA US570919A US 570919 A US570919 A US 570919A US 570919D A US570919D A US 570919DA US 570919 A US570919 A US 570919A
- Authority
- US
- United States
- Prior art keywords
- castings
- annealing
- metal castings
- annealing metal
- asbestos
- 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 22
- 238000000137 annealing Methods 0.000 title description 14
- 239000002184 metal Substances 0.000 title description 12
- 229910052751 metal Inorganic materials 0.000 title description 12
- 239000010425 asbestos Substances 0.000 description 14
- 229910052895 riebeckite Inorganic materials 0.000 description 14
- 239000000835 fiber Substances 0.000 description 10
- 238000005266 casting Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000003247 decreasing Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
Definitions
- the process of our invention may be generally described as consisting in enveloping the castings to be annealed in fibrous or finelydivided asbestos, which is preferably tightly packed about the castings in a porous or perforated chamber, whereupon the whole is introduced into the annealing-furnace and subjected to an annealing heat for a period of, say, twenty-four hours, when it is withdrawn therefrom and allowed to cool slowly,the process being thus completed.
- the asbestos may be slightlymoistened when packing to secure flexibility.
- a represents a bar of caststeel, around which is packed the asbestos fiber 6, contained in the iron box 0, said asbestos fiber being first moistened to secure flexibility, and afterward tamped thoroughly in.
- the box 0 has perforations d d drilled in its walls to admit of a free circulation of air and escape of vapor.
- the box is then closed, and the whole introduced into the annealingfurnace, where it is allowed to remain for a period of, say, twenty-four hours, when it is withdrawn and allowed to cool, the process thereupon being completed.
- a saving of time varying from seven to ten days is thus effected by the process of our invention over the methods heretofore in use.
Description
(No Model.)
J. BVETTS 81; P. C. SGHURZ.
PROCESS OF ANNBALING METAL GASTINGS.
No. 570.919. Patented'Nov'. 10, 1896.
- rzz/arzfor-sx m: moms mans 00.. wcfoumm, wAsumoYom n. a
UNITED STATES PATENT OFFICE.
JAMES EVETTS AND FRANCIS G. SOIIURZ, OF CHICAGO, ILLINOIS.
PROCESS OF ANNEALING M ETAL CASTINGS.
SPECIFICATION forming part of Letters Patent No. 570,919, dated November 10, 1896.
Application filed July 11,1896. Serial No. 598,788. (No specimens.)
To all whom it may concern.-
Be it known that we, JAMES EvE'rTs, a subject of the Queen of Great Britain, and FRAN- oIs C. SCHURZ, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Processes of nealing metal castings, and has for its object to provide means for annealing or decarbonizing metal castings, as, for instance, steel castings, in shorter space of time and with less application of heat than heretofore.
The process of our invention may be generally described as consisting in enveloping the castings to be annealed in fibrous or finelydivided asbestos, which is preferably tightly packed about the castings in a porous or perforated chamber, whereupon the whole is introduced into the annealing-furnace and subjected to an annealing heat for a period of, say, twenty-four hours, when it is withdrawn therefrom and allowed to cool slowly,the process being thus completed. The asbestos may be slightlymoistened when packing to secure flexibility.
The advantages of this system are as follows: The thorough enveloping of the casting in the non-conductingmaterial secures a more even and regular heating; also the asbestos fiber, being in intimate contact with the surfaces of the metal, precludes the possibility of an oxid scale or crust forming on said surfaces, thereby allowing the atmospheric oxygen free and uninterrupted access to the same. By this means thedecarbonizing process is carried on with much greater speed, and the possibility of breaking or cracking the casting is greatly decreased.
The packing of asbestos fiber having once admitted the heat, retains it for a sufficient period of time to insure very gradual cooling of the casting.
The rough scaly surfaces which are present in castings annealed after the ordinary method are totally obviated .by our process of annealing, as when the protecting fiber is removed the castings come out with clean and smooth surfaces.
In the drawing, a represents a bar of caststeel, around which is packed the asbestos fiber 6, contained in the iron box 0, said asbestos fiber being first moistened to secure flexibility, and afterward tamped thoroughly in. The box 0 has perforations d d drilled in its walls to admit of a free circulation of air and escape of vapor. The box is then closed, and the whole introduced into the annealingfurnace, where it is allowed to remain for a period of, say, twenty-four hours, when it is withdrawn and allowed to cool, the process thereupon being completed.
A saving of time varying from seven to ten days is thus effected by the process of our invention over the methods heretofore in use.
Having thus described our invention,-'What we claim as new, and desire to secure by Letters Patent, is
The process of annealing metal castings,
which consists in enveloping the castings to be annealed in fibrous or finely-divided asbestos, which is tightly packed about the castings in a perforated or porous chamber or casing, the whole being exposed to an annealing heat and allowed to slowly cool, substantially as described.
In witness whereof we hereunto subscribe our names this 8th day of July, A. D. 1896.
JAMES EVETTS. FRANCIS O. SOHURZ. lVitnesses:
ELMER BISHOP, SELDEN FIsH.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US570919A true US570919A (en) | 1896-11-10 |
Family
ID=2639619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US570919D Expired - Lifetime US570919A (en) | Process of annealing metal castings |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US570919A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3370993A (en) * | 1965-03-18 | 1968-02-27 | Babcock & Wilcox Co | Heat treatment of metals |
-
0
- US US570919D patent/US570919A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3370993A (en) * | 1965-03-18 | 1968-02-27 | Babcock & Wilcox Co | Heat treatment of metals |
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