US1844701A - Method and apparatus for centrifugal casting - Google Patents

Method and apparatus for centrifugal casting Download PDF

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US1844701A
US1844701A US516885A US51688531A US1844701A US 1844701 A US1844701 A US 1844701A US 516885 A US516885 A US 516885A US 51688531 A US51688531 A US 51688531A US 1844701 A US1844701 A US 1844701A
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crucible
mould
metal
coil
casting
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US516885A
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Tama Cyrano
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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
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings

Definitions

  • My invention relates to a method and apparatus for centrifugal casting.
  • One object of my invention is to avoid the Stratification of the castings by preventing the metals from premature cooling and freezanother object is to heat the metal in the mould inductiv ly.
  • a further object is to use the crucible itself as a mould.
  • a further object is to provide amould rotating within an induction coil.
  • the metal is heated inductively during freezing.
  • the inductive heating presents no difficulties even with rotating moulds and prevents the metal from premature freezing so that the casting of unlform structure is obtained.
  • the crucible of induction furnaces can be used as a mould by rotating it within the induction coil after the metal has reached the molten state and the input has been reduced to such extent as to allow the slow solidification of the metal in the crucible.
  • the freezing process is finished the crucible has to be destroyed for removing the casting from it.
  • the induction coil of an induction furnace for heating a separate mould being located beneath the crucible within the coil.
  • the molten metal is allowed to flow into the mould through a tap hole and is then rotated together with the mould within the lower part of the induction coil, the windings of which are spaced further at this part than about the furnace so as to supply only as much heat to the metal as necessary for obtaining its slow freezing.
  • Fig. 1 shows a diagrammatical section through a rotating mould with inductive heating
  • Fig. 2 is a diagrammatical section of an induction furnace with extended induction coil and a mould located beneath the crucible within the lower part of the coil.
  • the mould 10 is surrounded by'an induction coil 11 and is supported by a rotatable table 12 which is driven by a suitable motor 13.
  • Fig. 2 the crucible 14 of an induction furnace is surrounded by a coil 15 extending below the bottom of the crucible.
  • a mould 16 Within the lower part of the coil a mould 16 is provided which is supported by a rotatable table- 17.
  • a tap hole 18 In the bottom of the crucible a tap hole 18 is provided through which the molten metal can flow into the mould 16.
  • the number of ampere-turns is smaller in the lower 'part of the coil than in its upper part so that the metal in the mould is heated just so as to allow its slow freezing.
  • Means for adjustment of the input to the coils in Figures 1 and 2 is shown in the conventional generator 19 supplying the coil' through connections 20 and 21 within one of-which is an adjustable inductance 22.
  • the crucible After having emptied the crucible it may be charged again and the new charge is melted while the casting in the mould is freezing.
  • the method for centrifugal casting which consists in casting the molten metal into a rotating mould, heating it therein inductively so as to prevent premature freezing and progressively reducing the inductive electric heat input so as to allow slow freezing of the metal in the crucible.
  • the method for centrifugal casting which consists in melting the metal in an induction furnace, pouring the metal into the middle of the crucible, in rotating the crucible while subjecting it to electric induction to additionally heat the molten metal and freezing the molten metal in the crucible while rotating and heating the same with reduced input.
  • An induction furnace for performing centrifugal casting comprising a crucible, an induction coilsurrounding said crucible and extending below the bottom of said crucible, and a rotatable mould within the lower part of said coil.
  • An induction furnace for performing centrifugal casting comprising a crucible, an induction coil surrounding said crucible and extending below the bottom of said crucible and a rotatable mould within the lower part of said coil, the number of ampere-turns per unit of length being smaller in the lower part than in the upper part of said coil.

Description

Feb. 9, 1932. c. TAMA 1,844,7M
METHOD AND APPARATUS FOR CENTRIF'UGAL CASTING Filed Feb. 19, 1931 Patented Feb. 9, 1932 GYBAANO TAMA, OI BERLIN, GERMANY METHOD AND APPARATUS FOR OENTRIIUGAL CASTING Application filed February 19, 1981, Serial No. 516,885, and in Germany December 19, 1929.
My invention relates to a method and apparatus for centrifugal casting.
It is known to cast metals by centrifugal casting. In performing this method the metal is cast into a rotating mould and freezed therein. Due to the uniform pressure caused by the centrifugal force, these castings have an extremely high density. However, this method has the disadvantage, that stratification occurs in thecasting if the metal is cooled too early, and this stratification deteriorates the quality of the casting.
One object of my invention is to avoid the Stratification of the castings by preventing the metals from premature cooling and freezanother object is to heat the metal in the mould inductiv ly.
A further object is to use the crucible itself as a mould.
A further object is to provide amould rotating within an induction coil.
Further objects will appear from the specification and the drawings aflixed thereto.
According to the invention the metal is heated inductively during freezing. The inductive heating presents no difficulties even with rotating moulds and prevents the metal from premature freezing so that the casting of unlform structure is obtained. As the inductive heating is very advantageous also for the melting operation, and is often used for this purpose, the crucible of induction furnaces can be used as a mould by rotating it within the induction coil after the metal has reached the molten state and the input has been reduced to such extent as to allow the slow solidification of the metal in the crucible. When the freezing process is finished the crucible has to be destroyed for removing the casting from it.
It is also possible to use the induction coil of an induction furnace for heating a separate mould being located beneath the crucible within the coil. Here the molten metal is allowed to flow into the mould through a tap hole and is then rotated together with the mould within the lower part of the induction coil, the windings of which are spaced further at this part than about the furnace so as to supply only as much heat to the metal as necessary for obtaining its slow freezing.
In the accompanying drawings Fig. 1 shows a diagrammatical section through a rotating mould with inductive heating and Fig. 2 is a diagrammatical section of an induction furnace with extended induction coil and a mould located beneath the crucible within the lower part of the coil.
Referring first to Fig. 1, the mould 10 is surrounded by'an induction coil 11 and is supported by a rotatable table 12 which is driven by a suitable motor 13.
In Fig. 2 the crucible 14 of an induction furnace is surrounded by a coil 15 extending below the bottom of the crucible. Within the lower part of the coil a mould 16 is provided which is supported by a rotatable table- 17. In the bottom of the crucible a tap hole 18 is provided through which the molten metal can flow into the mould 16. The number of ampere-turns is smaller in the lower 'part of the coil than in its upper part so that the metal in the mould is heated just so as to allow its slow freezing.
Means for adjustment of the input to the coils in Figures 1 and 2 is shown in the conventional generator 19 supplying the coil' through connections 20 and 21 within one of-which is an adjustable inductance 22.
After having emptied the crucible it may be charged again and the new charge is melted while the casting in the mould is freezing.
Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is:
1. The method for centrifugal casting which consists in casting the molten metal into a rotating mould, heating it therein inductively so as to prevent premature freezing and progressively reducing the inductive electric heat input so as to allow slow freezing of the metal in the crucible.
2. The method for centrifugal casting which consists in melting the metal in an induction furnace, pouring the metal into the middle of the crucible, in rotating the crucible while subjecting it to electric induction to additionally heat the molten metal and freezing the molten metal in the crucible while rotating and heating the same with reduced input.
3. An induction furnace for performing centrifugal casting comprising a crucible, an induction coilsurrounding said crucible and extending below the bottom of said crucible, and a rotatable mould within the lower part of said coil.
4. An induction furnace for performing centrifugal casting, comprising a crucible, an induction coil surrounding said crucible and extending below the bottom of said crucible and a rotatable mould within the lower part of said coil, the number of ampere-turns per unit of length being smaller in the lower part than in the upper part of said coil.
In testimony whereof I aflix my signature.
CYRANO TAMA.
US516885A 1929-12-19 1931-02-19 Method and apparatus for centrifugal casting Expired - Lifetime US1844701A (en)

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742328C (en) * 1941-07-12 1943-11-29 Glyco Metall Werke Method for lining bearing shells
US2450832A (en) * 1943-07-05 1948-10-05 Theodore C Kuhlman Centrifugal casting
US2542503A (en) * 1946-11-08 1951-02-20 Electric Storage Battery Co Apparatus for casting connecting straps on battery terminal lugs
US2557971A (en) * 1948-06-08 1951-06-26 Jr Harold M Jacklin Method of centrifugal casting
US2591424A (en) * 1948-09-02 1952-04-01 Warren Kinney Jr J Furnace charging device
DE860401C (en) * 1941-01-08 1952-12-22 Glyco Metall Werke Method for pouring composite cast bearing shells
US2779073A (en) * 1952-10-27 1957-01-29 Jr Harry B Osborn Receptacle for molten metal
US2826624A (en) * 1956-12-05 1958-03-11 Stanton L Reese Vapor shield for induction furnace
US2875483A (en) * 1959-03-03 Method and apparatus for solidifying steel ingots
US2917797A (en) * 1956-09-13 1959-12-22 Normacem Sa Rotary casting apparatus
US3304589A (en) * 1963-07-22 1967-02-21 Vologdin Vladisl Valentinovich Method of casting a wear-resistant layer on cast-iron internal combustion engine cylinder liners
US3410331A (en) * 1966-03-16 1968-11-12 Gen Motors Corp Method of casting an aluminumbased bearing alloy
US3557656A (en) * 1964-03-03 1971-01-26 Tech De Rech Industielles Et M Charging explosive projectiles, especially hollow charge projectiles
US3678986A (en) * 1970-04-27 1972-07-25 Siemens Ag Method for manufacturing homogeneous bodies from semiconductor alloys
US4170940A (en) * 1976-09-27 1979-10-16 Societe D'etudes, De Realisations Et D'applications Techniques Projectile charges
US4605054A (en) * 1983-09-26 1986-08-12 Kawachi Aluminium Casting Co., Ltd. Casting apparatus including a conductor for electromagnetic induction heating
US20080236707A1 (en) * 2004-09-03 2008-10-02 Gianfranco Passoni Method and Device For Producing a Mechanical Part, in Particular a Bearing Ring and a Part Produced By Said Method

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875483A (en) * 1959-03-03 Method and apparatus for solidifying steel ingots
DE860401C (en) * 1941-01-08 1952-12-22 Glyco Metall Werke Method for pouring composite cast bearing shells
DE742328C (en) * 1941-07-12 1943-11-29 Glyco Metall Werke Method for lining bearing shells
US2450832A (en) * 1943-07-05 1948-10-05 Theodore C Kuhlman Centrifugal casting
US2542503A (en) * 1946-11-08 1951-02-20 Electric Storage Battery Co Apparatus for casting connecting straps on battery terminal lugs
US2557971A (en) * 1948-06-08 1951-06-26 Jr Harold M Jacklin Method of centrifugal casting
US2591424A (en) * 1948-09-02 1952-04-01 Warren Kinney Jr J Furnace charging device
US2779073A (en) * 1952-10-27 1957-01-29 Jr Harry B Osborn Receptacle for molten metal
US2917797A (en) * 1956-09-13 1959-12-22 Normacem Sa Rotary casting apparatus
US2826624A (en) * 1956-12-05 1958-03-11 Stanton L Reese Vapor shield for induction furnace
US3304589A (en) * 1963-07-22 1967-02-21 Vologdin Vladisl Valentinovich Method of casting a wear-resistant layer on cast-iron internal combustion engine cylinder liners
US3557656A (en) * 1964-03-03 1971-01-26 Tech De Rech Industielles Et M Charging explosive projectiles, especially hollow charge projectiles
US3410331A (en) * 1966-03-16 1968-11-12 Gen Motors Corp Method of casting an aluminumbased bearing alloy
US3678986A (en) * 1970-04-27 1972-07-25 Siemens Ag Method for manufacturing homogeneous bodies from semiconductor alloys
US4170940A (en) * 1976-09-27 1979-10-16 Societe D'etudes, De Realisations Et D'applications Techniques Projectile charges
US4305324A (en) * 1976-09-27 1981-12-15 Societe D'etudes, De Realisations Et D'applications Techniques Projectile charges
US4605054A (en) * 1983-09-26 1986-08-12 Kawachi Aluminium Casting Co., Ltd. Casting apparatus including a conductor for electromagnetic induction heating
US20080236707A1 (en) * 2004-09-03 2008-10-02 Gianfranco Passoni Method and Device For Producing a Mechanical Part, in Particular a Bearing Ring and a Part Produced By Said Method
US7594310B2 (en) * 2004-09-03 2009-09-29 Gianfranco Passoni Method and device for producing a mechanical part, in particular a bearing ring and a part produced by said methods

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