US2885751A - Vacuum casting apparatus - Google Patents

Vacuum casting apparatus Download PDF

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Publication number
US2885751A
US2885751A US681406A US68140657A US2885751A US 2885751 A US2885751 A US 2885751A US 681406 A US681406 A US 681406A US 68140657 A US68140657 A US 68140657A US 2885751 A US2885751 A US 2885751A
Authority
US
United States
Prior art keywords
chamber
plate
ladle
base
bell
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
Application number
US681406A
Other languages
English (en)
Inventor
John N Hornak
William M Thatcher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
United States Steel Corp
Original Assignee
United States Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE570541D priority Critical patent/BE570541A/xx
Priority to LU36277D priority patent/LU36277A1/xx
Application filed by United States Steel Corp filed Critical United States Steel Corp
Priority to US681406A priority patent/US2885751A/en
Priority to GB20926/58A priority patent/GB843064A/en
Priority to DEU5462A priority patent/DE1154599B/de
Priority to FR1201749D priority patent/FR1201749A/fr
Application granted granted Critical
Publication of US2885751A publication Critical patent/US2885751A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould

Definitions

  • This invention relates to improvements in vacuum, castingaapparatus .and more particularlyto an improved' ingotsintended .for large forgings andthe like is par-, ticularly desirable :but .has ,proven particularly difficult. because of the size of castings involved. Ingotsv of 100' inches or more in diameter and weighing between. 150
  • Figure l is a vertical section through the base and bell portions which form the casting chamber of our invention.
  • Figure 2 is a top view of the chamber with the ladle 2 ⁇ removed,ithe.,1eft.halfofthevfigure showing the base with; the bell portion removedpand,
  • Figure 3 is an enlarged detail showing the seal-between the baseandbellportions.
  • meral 2 designates generally the vacuum casting chamber of our invention carrying a suitable ladle L equipped with a conventional stopper and enclosing a suitable moldM.
  • Thechamber 2 comprises a bell portion 6 and a base.8,
  • The. base 8 includes a bottom plate 12 and an upstanding rim portion, which terminatesqin a ringmemberr16 having an upwardly facing, bearing surface 18.
  • the rim may be stiffened by a plurality of stub columns 20 and brace plates 22 disposed at intervals about the rim below.
  • a pipe 24 through the side of rim 14 connects the interior of ,the chamber to a suitable vacuum pump, not shown.
  • a suitable m,old:stool S may be disposedv on a.:suppor.ting.spiderwork of I-beams 26 inside the.rim. and.;carried by the base plate 12.
  • Plates 28.. having an inwardly sloping guide surface27 are disposed atintervalsaboutthering member of. the rim to guide the ;bell portion :6 into proper engagement with bearing
  • the bearing surface 18 is provided with surface 18.
  • sealing ring 32 formedof .resilientmaterial. such. as natural rubber, neo..- prene. rubber, silicone rubber-or. the.like..
  • aling ring should be of sufiicient: thickness in:relation to the depth ,of. groove 30.; to be-compressed at least about 20% but not morethan. about 30%.and, .to insure asatisfactory servicelife, the groove and..ring.should..be ofsuchvolume, that the ring; may expand laterally whencompressed and. not overfillu thegroove.
  • the bottom.. plate.12, rim-14 and ring 16;. are joined in a gas tightmanneras by continuous welds..,
  • the bell portion-6 of,the:chamber comprises a ring
  • a relatively thin gauged cylindrical shell 45 closed at the top by a circular plate 46 having a dished portion 48 adjacent its juncture with the side wall of the shell.
  • Dished portion 48 is preferably of somewhat thinner gauge than the balance of the plate 46 and by reason of its shape and flexibility provides means to compensate for unequal heating and expansion of the shell when teeming molten metal into the mold M and during such time as may elapse between teeming and the removal of the bell portion of the chamber.
  • the cylindrical side wall of shell 45 is relieved of the dead weight of top plate 46 by suspending the latter from the plate 42 of the ladle platform by a plurality of stud bolts 50 carried by the plate 46 and extending through the plate 42.
  • Centrally disposed of plates 42 and 46 is a tubular member 52 providing a pouring conduit through which molten metal can be teemed from the ladle L into a mold M in the evacuated chamber. Joints between the pouring conduit and plates 42 and 46, between the plate 42 and the cylindrical side wall of shell 45 and between the shell 45 and bearing ring 36 are made gas tight as by continuous welds.
  • the mold M is positioned on the stool S, and the bell section lowered over the base being guided into proper sealing positioned by the plates 28.
  • the ladle L containing at least a portion of the metal to be cast is then placed on plate 42 of the ladle platform to rest on the sealing ring 44 thus completely Patented May 12, 1959 sealing the chamber from the atmosphere.
  • the chamber is then evacuated through pipe 24 to about 100 microns of Hg and teeming of the ingot initiated. The vacuum is maintained until the teeming is complete, care being taken to maintain sufiicient metal in the ladle to seal the system during this operation.
  • the present invention aflords more rapid cooling than heretofore available and the bell section can be used to serve several bases. Further since the structure is such that warping is avoided without the use of insulating linings, lower vacuums can be rapidly achieved and maintained.
  • Vacuum casting apparatus comprising, a gas tight base member including an upwardly facing bearing surface having a groove therein adapted to receive a compressible sealing ring, a ring of compressible sealing material disposed in said groove, and a bell member supported by said base member, said bell member having a ring-like bearing plate adapted to rest on the rim of said base and compress said sealing ring, a plurality of spaced columnar supports attached to and rising from said hearing plate, a platform carried by said columnar supports and adapted to support a pouring ladle, a gas tight shell comprising a wall portion disposed inside said columnar supports carried by said bearing plate and attached to the latter in a gas tight manner and a top plate suspended from said platform, said top plate including a relatively thinner dished section adapted to flex under expansion and contraction forces, a tubular member carried by said platform centrally thereof extending through and attached to said top plate, and means for evacuating the gas tight chamber formed by said bell member and base.
  • Vacuum casting apparatus comprising, a gas tight base member including a plate and an upwardly extending rim, said rim having an upwardly facing bearing surface having an annular groove therein adapted to receive a compressible sealing ring, a ring of compressible sealing material disposed in said groove having a thickness in the uncompressed condition about 25% greater than depth of the groove and a volume not greater than the volume of the groove, and a bell member supported by said base member, said bell member having a ringlike bearing plate adapted to rest on the rim of said base and compress said sealing ring, a plurality of spaced columnar supports attached to and rising from said bearing plate, a platform carried by said columnar supports and adapted to support a pouring ladle, a gas tight shell comprising a cylindrical wall portion disposed inside said columnar supports carried by said bearing plate and attached to the latter in a gas tight manner and a circular top plate suspended from said platform, said top plate including a relatively thinner dished section adapted to flex under expansion and contraction forces, a tub

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US681406A 1957-08-30 1957-08-30 Vacuum casting apparatus Expired - Lifetime US2885751A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE570541D BE570541A (hr) 1957-08-30
LU36277D LU36277A1 (hr) 1957-08-30
US681406A US2885751A (en) 1957-08-30 1957-08-30 Vacuum casting apparatus
GB20926/58A GB843064A (en) 1957-08-30 1958-06-30 Vacuum casting apparatus
DEU5462A DE1154599B (de) 1957-08-30 1958-07-15 Vakuumgiessvorrichtung
FR1201749D FR1201749A (fr) 1957-08-30 1958-08-19 Appareil de coulée sous vide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US681406A US2885751A (en) 1957-08-30 1957-08-30 Vacuum casting apparatus

Publications (1)

Publication Number Publication Date
US2885751A true US2885751A (en) 1959-05-12

Family

ID=24735151

Family Applications (1)

Application Number Title Priority Date Filing Date
US681406A Expired - Lifetime US2885751A (en) 1957-08-30 1957-08-30 Vacuum casting apparatus

Country Status (6)

Country Link
US (1) US2885751A (hr)
BE (1) BE570541A (hr)
DE (1) DE1154599B (hr)
FR (1) FR1201749A (hr)
GB (1) GB843064A (hr)
LU (1) LU36277A1 (hr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2996772A (en) * 1960-02-15 1961-08-22 Unmited States Steel Corp Vacuum casting apparatus
US3013316A (en) * 1958-12-31 1961-12-19 United States Steel Corp Method and apparatus for vacuum casting
US3024507A (en) * 1959-07-30 1962-03-13 Gero Metallurg Corp Method of vacuum casting
US3072985A (en) * 1960-02-03 1963-01-15 Skf Svenska Kullagerfab Ab Method for vacuum casting of steel
US3078529A (en) * 1959-04-24 1963-02-26 Titanium Metals Corp Melting crucible and cooling means therefor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US211953A (en) * 1879-02-04 Improvement in apparatus for casting metals
US1913652A (en) * 1931-09-03 1933-06-13 Newport Ind Inc Container top
US2027430A (en) * 1933-10-17 1936-01-14 Hansen Carl Hilmer Container
US2233580A (en) * 1940-01-16 1941-03-04 American Steel & Wire Co Inner cover for annealing furnaces
US2482257A (en) * 1944-11-09 1949-09-20 Jr John Frei Investing method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE524812A (hr) * 1951-04-29

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US211953A (en) * 1879-02-04 Improvement in apparatus for casting metals
US1913652A (en) * 1931-09-03 1933-06-13 Newport Ind Inc Container top
US2027430A (en) * 1933-10-17 1936-01-14 Hansen Carl Hilmer Container
US2233580A (en) * 1940-01-16 1941-03-04 American Steel & Wire Co Inner cover for annealing furnaces
US2482257A (en) * 1944-11-09 1949-09-20 Jr John Frei Investing method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3013316A (en) * 1958-12-31 1961-12-19 United States Steel Corp Method and apparatus for vacuum casting
US3078529A (en) * 1959-04-24 1963-02-26 Titanium Metals Corp Melting crucible and cooling means therefor
US3024507A (en) * 1959-07-30 1962-03-13 Gero Metallurg Corp Method of vacuum casting
US3072985A (en) * 1960-02-03 1963-01-15 Skf Svenska Kullagerfab Ab Method for vacuum casting of steel
US2996772A (en) * 1960-02-15 1961-08-22 Unmited States Steel Corp Vacuum casting apparatus

Also Published As

Publication number Publication date
BE570541A (hr)
DE1154599B (de) 1963-09-19
LU36277A1 (hr)
FR1201749A (fr) 1960-01-05
GB843064A (en) 1960-08-04

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