US3650313A - Method for the production of castings from alloys of metals and gases - Google Patents

Method for the production of castings from alloys of metals and gases Download PDF

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Publication number
US3650313A
US3650313A US863153A US3650313DA US3650313A US 3650313 A US3650313 A US 3650313A US 863153 A US863153 A US 863153A US 3650313D A US3650313D A US 3650313DA US 3650313 A US3650313 A US 3650313A
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US
United States
Prior art keywords
gas
melt
reservoir
mould
chamber
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Expired - Lifetime
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US863153A
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English (en)
Inventor
Angel Tontchev Balevski
Ivan Dimov Nikolov
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Institute po Metaloznanie i Technologia na Metalite
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Institute po Metaloznanie i Technologia na Metalite
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/08—Controlling, supervising, e.g. for safety reasons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum

Definitions

  • the solubility of the gas which depends upon its partial pressure, may be equal in the melt, as well as in the solidifying metal; the total gas pressure in both [56] References cued chambers may be chosen in accordance with the requirement UNITED STATES PATENTS of the casting process, so that the melt may be conveyed to the mold.- 1,888,132 11/1932 Kinzel 164/66 2,069,205 2/1937 Arness ..75/59 X 4 Claims, 2 Drawing Figures Patented March 21, 1972 2 Sheets-Sheet 1 ATTORNEY INVENTORS I Patented March 21, 1972 3,650,313
  • the invention relates to a method of production of shaped castings from metals and metal alloys, which contain in solid state a dissolved or chemically bound gas, in such a quantity as to exert an advantageous influence on the physical, chemical or other properties of the material obtained, as well as to an apparatus for the realization of the method. It is known, that gases when contained as a solid solution or chemically bound components in the structure of metals, have an extremely favorable effect on their properties. Nitrogen, as a typical example, induces in a number of iron-based alloys the formation of structures with improved or new properties.
  • the object of the present invention is to overcome the existing difficulties in obtaining highly efficient alloys from metal and gases by using a method which eliminates all the disadvantages mentioned, i.e., a method permitting the obtaining by comparatively simple means castings from such alloys in moulds, whereby the molten metal is treated with the gas to be dissolved in a separate reservoir, which is larger compared to the weight of the casting.
  • this problem is solved in such a way that during the casting process the reservoir with the melt and the mould are disposed in separate chambers, and are subjected to the pressure of an atmosphere composed by the gas to be dissolved, and some other gas which is inert to the metal, in such proportion, that the partial pressure of the gas to be dissolved in the chamber with the mold is higher than that in the chamber with the reservoir for the melt.
  • solubility of the gas which depends on its partial pressure, may be equal in the melt, as well as in the solidifying metal, and the total gas pressure in both chambers may be chosen in accordance with the requirements of the casting process, i.e., to be equal in both chambers, or to be increased from the side of the chamber with the reservoir for the melt, so that the melt may be conveyed to the mould.
  • FIG. 1 shows a first embodiment of apparatus, in which the melt is conveyed under the action of gas pressure
  • FIG. 2 shows a second embodiment of apparatus, in which the melt is conveyed gravitationally.
  • the reservoir for the melt l is placed in a hermetically closed and heat-insulated or heated chamber 2, and is connected by means of a delivery pipe 3 to the mould 4, which is closed in another hermetic chamber 5.
  • a valve 6 and a barrier 7 are provided on the delivery pipe 3 along the path of the metal, which can be controlled by means of familiar devices, i.e., selectively to close and open the delivery pipe while the process takes place.
  • Two reservoirs 8 and 9 contain under pressure the gas being dissolved mixed with an inert gas at different and suitably chosen concentrations, while a circulation-regenerative system 10 is provided for purification and returning to these reservoirs the gases that escape from the hermetic chambers with the reservoir for the melt and with the mould.
  • the capacity and the pressure of the gas flows are controlled by the valves 12 to 17.
  • the process is carried out in the apparatus of F IG. 1 in the following way.
  • the chamber 2 with the reservoir for the melt l is filled by opening the valve 12 to permit a gas mixture from the reservoir 8 to flow into a tube 11 immersed in the melt for treating it. It is important that the delivery of the gas mixture should be done slowly and should take place through the melt, by means of the pipe 11 or through a porous wall at the bottom of the crucible, thus ensuring a good mixing of the gas with the melt.
  • a gas mixture from reservoir 9 is let in through the valve 13 into the chamber 5 with the mould 4. The pressures in both chambers 2 and 5 are equal during this preparatory stage of the process, so that by opening the barrier 7 no moving of the melt is provoked.
  • the melt is conveyed along the delivery pipe 3 to the mould 4 and fills it. If the concentration of the active gas in the reservoir 9, respectively in the chamber 5 and the mould 4, is considerably higher than that in the reservoir 8 and in the chamber 2, it is not possible, because of the short time of filling the mould, to enrich considerably the molten metal with gas; but the whole crystallization process in the mould, which begins immediately after filling of the said mould with melt, takes place at a high partial pressure of the active gas, i.e., the gas already dissolved in the melt 1 cannot be separated from the solidifying-melt and remains dissolved in the said melt.
  • the superfluous melt from the delivery pipe returns in the reservoir for the melt, and the barrier 7 may be closed. It will be easy, if needed, to increase additionally the pressure of the active gas in chamber 5 during the period till the crystallization of the casting is completed.
  • the casting is removed from the mould 4 after the active gas from chamber'S has been sucked through valve 17 in the circulation-regenerative system 10, in order to be returned in reservoir 9.
  • the casting process may be repeated.
  • valve 16 is operated for sucking the gas from chamber 2 only after the molten metal in reservoir 1 has been totally drained.
  • the apparatus may operate while the melt is conveyed to the mould gravitationally.
  • the apparatus has the same basic elements as the apparatus of FIG. 1, and designated by the same reference characters.
  • the reservoir for the melt is disposed higher than the mould 4.
  • the melt flow may be controlled by a known stopper device 18, which is operated from outside the reservoir for the melt, and opens or closes the pouring hole at the bottom of said reservoir at will.
  • a method for the production of castings from alloys of I metals and gases which comprises disposing a reservoir for a melt of metal in a first hermetically closed chamber, disposing a mould in a second hermetically closed chamber, subjecting both chambers to the pressure of an atmosphere composed of the gas to be dissolved in the molten metal and some other gas which is inert to the metal, feeding molten metal from the reservoir into the mould, and controlling the proportions of said gases so that the partial pressure of the gas to be dissolved in the second chamber is higher than that in the first chamber, and maintaining such condition until the casting completely solidifies.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Polyurethanes Or Polyureas (AREA)
US863153A 1968-10-09 1969-10-02 Method for the production of castings from alloys of metals and gases Expired - Lifetime US3650313A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BG1078568 1968-10-09

Publications (1)

Publication Number Publication Date
US3650313A true US3650313A (en) 1972-03-21

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US863153A Expired - Lifetime US3650313A (en) 1968-10-09 1969-10-02 Method for the production of castings from alloys of metals and gases

Country Status (14)

Country Link
US (1) US3650313A (ru)
JP (1) JPS524490B1 (ru)
AT (1) AT301064B (ru)
BE (1) BE739953A (ru)
CH (1) CH507756A (ru)
DK (1) DK123511B (ru)
ES (1) ES372140A1 (ru)
FR (1) FR2020237A1 (ru)
GB (1) GB1269146A (ru)
LU (1) LU59588A1 (ru)
NL (1) NL161385C (ru)
NO (1) NO133577C (ru)
SE (1) SE369048B (ru)
SU (1) SU427506A3 (ru)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788790A (en) * 1971-02-20 1974-01-29 Niitm Pri Ban Machine for casting under pressure
US3861457A (en) * 1971-07-21 1975-01-21 Renault Regulating devices for pouring molten metal
US3880221A (en) * 1971-04-07 1975-04-29 Inst Melalognanie I Technologi Method for continuous casting of metals
US3901305A (en) * 1971-04-07 1975-08-26 Inst Po Metalloznanie I Tekno Apparatus for continuous casting of metals
US4405295A (en) * 1982-03-01 1983-09-20 Amsted Industries Incorporated Method of manufacturing complex metallic plate
US4550763A (en) * 1980-12-11 1985-11-05 Institute Po Metaloznanie I Technologia Na Metalite Method and machine for pressure diecasting
US4573517A (en) * 1982-02-08 1986-03-04 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Fiber-reinforced metals
US6722417B2 (en) * 2000-04-10 2004-04-20 Nissin Kogyo Co., Ltd. Deoxidation casting, aluminium casting and casting machine
US6745816B2 (en) 2000-05-10 2004-06-08 Nissin Kogyo Kabushiki Kaisha Method of casting and casting machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1979000436A1 (en) * 1977-12-26 1979-07-12 Nippon Telegraph & Telephone Optical coordinate input device
JPS58209464A (ja) * 1982-05-28 1983-12-06 Japan Steel Works Ltd:The 層状複合金属板素材の製造方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1888132A (en) * 1930-10-27 1932-11-15 Electro Metallurg Co Method of casting steel ingots
US2069205A (en) * 1932-12-03 1937-02-02 Rustless Iron & Steel Corp Method of producing iron chromium alloys of appreciable nitrogen content
US2426814A (en) * 1944-02-24 1947-09-02 George R Burkhardt Method for treating metals with noble gases
US2724160A (en) * 1951-06-08 1955-11-22 Int Alloys Ltd Method of reducing shrinkage defects in metal castings
US2745740A (en) * 1954-09-02 1956-05-15 Ford Motor Co Process of preparing an iron base melt
US3196501A (en) * 1961-01-26 1965-07-27 Balgarska Akademia Na Naukite Apparatus and method for metal casting
US3402756A (en) * 1964-05-12 1968-09-24 Frehser Josef Process of producing high-nitrogen alloy steel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1888132A (en) * 1930-10-27 1932-11-15 Electro Metallurg Co Method of casting steel ingots
US2069205A (en) * 1932-12-03 1937-02-02 Rustless Iron & Steel Corp Method of producing iron chromium alloys of appreciable nitrogen content
US2426814A (en) * 1944-02-24 1947-09-02 George R Burkhardt Method for treating metals with noble gases
US2724160A (en) * 1951-06-08 1955-11-22 Int Alloys Ltd Method of reducing shrinkage defects in metal castings
US2745740A (en) * 1954-09-02 1956-05-15 Ford Motor Co Process of preparing an iron base melt
US3196501A (en) * 1961-01-26 1965-07-27 Balgarska Akademia Na Naukite Apparatus and method for metal casting
US3402756A (en) * 1964-05-12 1968-09-24 Frehser Josef Process of producing high-nitrogen alloy steel

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788790A (en) * 1971-02-20 1974-01-29 Niitm Pri Ban Machine for casting under pressure
US3880221A (en) * 1971-04-07 1975-04-29 Inst Melalognanie I Technologi Method for continuous casting of metals
US3901305A (en) * 1971-04-07 1975-08-26 Inst Po Metalloznanie I Tekno Apparatus for continuous casting of metals
US3861457A (en) * 1971-07-21 1975-01-21 Renault Regulating devices for pouring molten metal
US4550763A (en) * 1980-12-11 1985-11-05 Institute Po Metaloznanie I Technologia Na Metalite Method and machine for pressure diecasting
US4573517A (en) * 1982-02-08 1986-03-04 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Fiber-reinforced metals
US4405295A (en) * 1982-03-01 1983-09-20 Amsted Industries Incorporated Method of manufacturing complex metallic plate
US6722417B2 (en) * 2000-04-10 2004-04-20 Nissin Kogyo Co., Ltd. Deoxidation casting, aluminium casting and casting machine
US6745816B2 (en) 2000-05-10 2004-06-08 Nissin Kogyo Kabushiki Kaisha Method of casting and casting machine
US20050000672A1 (en) * 2000-05-10 2005-01-06 Keisuke Ban Method of casting and casting machine
US6964293B2 (en) 2000-05-10 2005-11-15 Nissin Kogyo Co., Ltd. Method of casting and casting machine

Also Published As

Publication number Publication date
GB1269146A (en) 1972-04-06
SU427506A3 (ru) 1974-05-05
FR2020237A1 (ru) 1970-07-10
ES372140A1 (es) 1971-09-16
DE1950987B2 (de) 1974-05-16
NL161385C (nl) 1980-02-15
DK123511B (da) 1972-07-03
SE369048B (ru) 1974-08-05
JPS524490B1 (ru) 1977-02-04
BE739953A (ru) 1970-03-16
DE1950987A1 (de) 1970-04-16
NO133577C (ru) 1976-05-26
NL161385B (nl) 1979-09-17
NL6915179A (ru) 1970-04-13
NO133577B (ru) 1976-02-16
CH507756A (de) 1971-05-31
LU59588A1 (ru) 1970-01-15
AT301064B (de) 1972-08-25

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