US1894983A - Apparatus for casting core molds - Google Patents

Apparatus for casting core molds Download PDF

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Publication number
US1894983A
US1894983A US519936A US51993631A US1894983A US 1894983 A US1894983 A US 1894983A US 519936 A US519936 A US 519936A US 51993631 A US51993631 A US 51993631A US 1894983 A US1894983 A US 1894983A
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US
United States
Prior art keywords
core
mold
copper
casting
shell
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
US519936A
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English (en)
Inventor
William F Eppensteiner
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.)
American Metal Co Ltd
Original Assignee
American Metal Co Ltd
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
Application filed by American Metal Co Ltd filed Critical American Metal Co Ltd
Priority to US519936A priority Critical patent/US1894983A/en
Priority to GB3719/32A priority patent/GB378332A/en
Priority to FR731597D priority patent/FR731597A/fr
Priority to DEA65254D priority patent/DE621604C/de
Application granted granted Critical
Publication of US1894983A publication Critical patent/US1894983A/en
Anticipated expiration legal-status Critical
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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
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/04—Casting hollow ingots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture
    • B22D7/08—Divided ingot moulds

Definitions

  • Such molds are used for casting parallelsided copper cakes or slabs as set forth in Patent No. 1,779,534, dated October 28, 1930.
  • a suitable mold for that purpose is set forth in Patent No. 1,785,941, dated December 23, 1930.
  • For casting copper cakes or slabs it is preferable to make the mold of copper with suitable provision for water-cooling, preferably by providing cored passages in the mold walls as in the last-named patent.
  • the casting of the mold is formed around a specially constructed, yielding core which is made of a shell of sheet metal.
  • This metal shell is filled with some heat-conducting material, preferably comminuted metal, such as copper chips or shavings. Such filling supports the shell while yielding sufficiently for the purpose.
  • Such filling material affords numerous air spaces so that the imprisoned air has a cooling effect upon the core. It is important tofurther cool the core by providing a cooling coil suitably located within it through which water is circulated.
  • FIG. 1 A suitable and preferred embodiment of the invention is shown in the accompanying drawing, where itis applied for the making of a mold adapted for the casting of flat cakes for rolling down into sheet copper, according to the method set forth in Patent No. 1,779,534, granted October 28, 1930.
  • the perfected construction of mold for easting such cakes is set forth in Patent No. 1,785,941, dated December 23, 1930, and illustrated in Figs. 1, 2 and 3 thereof.
  • For making such mold of copper it is preferable for many reasons to cast it around a core which forms the central casting cavity of Serial No. 519,936.
  • molten copper in cooling and after it has apparently solidified passes through a.plas-' tic condition before finally hardening, in which condition it has so little cohesion that it cannot resist the tensile stress due to its contraction around an unyielding core.
  • This difliculty is corrected by the present invention, wherein the casting of the mold is performed around a specially constructed yielding core, as will be more particularly described.
  • Figure 1 is av horizontal section of the mold ready for pouring.
  • Fig. 2 is a transverse vertical mid-section thereof
  • Fig. 3 is a longitudinal mid-section.
  • Fig. 4 is a perspective view of the sheet metal core.
  • Fig. 5 is a fragmentary enlargement of a part of Fig. 1 showing a detail.
  • Fig. 6 is an inverted perspective of a frame for holding the core.
  • A designates the outer mold in which the future cored mold is to be cast
  • B designates the core
  • C is the bottom of the mold A.
  • the mold A is shown as made of opposite side plates (1, a and end plates 6, I). These plates are held together in any suitable manner, preferably by bands or straps surrounding the exterior of the mold and tightened by wedges or otherwise. Such holding means forms no part of my invention and is known in the art, and may be substituted by any other means for fastening the members or sections of the outer mold together.
  • the bottom C may also be fastened in any suitable way, it being sufficient with a mold of suitable weight to rely on the Weight of the mold to hold it in place.
  • the core is held centered within the mold in anysuitable way, as for example, by a means which will be later described.
  • the core B instead of being a solid casting as heretofore, with cored or drilled passages for water circulation, is made as a shell of sheet metal, as best shown in Fig. 4.
  • the metal used is preferably copper, in the form of sheet copper or thin plate copper. Its' thickness may vary, but from one-sixteenth to one-eighth inch thickness aflords a suitable range.
  • the top and bottom of the core are best made. open, the metal sheets or plates 0, 0 being bent to form the sides and ends of the core.
  • the best construction is-to make the core of two sheets or plates flan ed up at their sides, these flanged portions at being strongly united by double riveting, as
  • stays g, g which may be constructed as copper rods passing across the core, their ends entering throng holes in the copper sheets and riveted down thereto, as shown in Fig. 5.
  • the shell thus constructed is set in place in the mold A and is filled with some substance which will prevent or limit itsx con-
  • the filling material has two purposes: .(1) to reinforce the thin shell against collapse under the pressure of the metal poureda'round it, at which time it is weakened by the heat imparted to it, and (2) to provide meansfor conducting heat away from the sheet metal shell and thereby protect it against being melted out. It also provides interstices within which air on other gas or fl-uidis imprisoned for cooling purposes. The best results are obtained with metal, preferably copper, in subdivided form, such as chips,
  • Cast molds of copper are best made with i a. core ofsheet copper and a filling of comminuted'copper, the core being suitably held ,in its central position within the mold.
  • the core should be carefully coated with" t e usual bone-ash mixture; and dry. bone-ash .should be sprinkled around the' junction of the core with the base plate of the mold.
  • the sheet metal shell then remains, usually partly attached within the cored cavity of the cast mold, and is then to be stripped therefrom, except for some portions,-particularly at the lower corners of the core,which are found to have become fused to the copper constituting the cast mold. Any such mold requires that its cored cavity be dressed out by machining, and this operation readily removes an adhering portions or fused-in portions 0 the shell. By making the core and filling of copper, any contamination of the cast metal is avoided.
  • coolingv means For efiectively cooling the core, it is necessary to provide it with an internal coolingv means, preferably by circulating water through a coil placed therein.
  • Such cooling coil is lettered F, and is best introduced from above, being suitably held in place within the hollow core and being located therein before the filling D is introduced.
  • the coil is best made of reversed bends, as shown in Fig. 3, and the cross-ties g, g are so located that their presence does not interfere with the insertion of the coil after the hollow shell has been placed in its proper location within the outer mold.
  • a rapid circulation of water ismaintained through the coil during the v casting; a pressure of from 30 to 50 pounds per square inch and a temperature of from to 210 degrees Fahrenheit have been found suitable. It is preferable to make the coil of copper pipe, although iron or steel pipe may well be used.
  • the method consists in placing the hollow sheet'metal shell (suitably coated with bone-ash, as usual) in the mold, holding it temporarily by any suitable means, such as blocking; then lowering the coil into place within the shell, fastening the coil fixedly in place by any suitable means (such as will be described), and then pouring in the. filling material and packing it down thoroughly to fill the spaces around the coil and within the shell as firmly as may be necessary.
  • the mold isthen ready for pouring.
  • the outer mold is taken apart and. the coil and filling arerem'oved,-and the sheet metal shell of the core is removed from withm the'cast mold in the manner already described. 4
  • the core and coil may be variously held in place within the mold A. This may be done by providing means" for holding the shell in place, the coil being located by the intervening packing material; or by holding the coil in place and utilizing the packing material to hold the core in position. ⁇ Vhilc either means may be successfully applied, the latter is considered preferable.
  • a. frame G (shown separately in Fig. 6) is slipped over its upper end, as shown in Figs. 2 and 3, and is itself suitably located with respect to the mold A; this being conveniently done by providing the frame G with pins or dowels j which enter into sockets k in the top of the end plates 6, b.
  • the bottom of the shell may be temporarily blocked in place, or the bone-ash sprinkled around it may afford a sufficient hold, there being no strains tending to displace it at the bottom.
  • the coil F is then lowered into place within the .shell and the filling material is introduced, being tamped down around the coil, while holding the bottom portion of the coil centrally within the shell.
  • the filling thus introduced serves to keep the coil and shell properly spaced relatively to one another.
  • the coil is temporarily held in place, as by placing wooden blocks m, m under its horizontal pipes Z, Z, as shown in Figs. 2 and 3. After introducing all of the filling material, these blocks are no longer needed and may be removed, as well as any blocking that may have been introduced around the bottom of the shell.
  • the mold is then ready for pouring, as already described.
  • the improved yielding or slightly collapsible core provided bythe present invention has certain important advantages over a rigid core.
  • the core With a rigid or solid core, whether water-cooled or not, the core can not yield to the contraction of the surrounding cast metal, which gives rise to the liability that the cast metal in cooling may crack by reason of the internal strains developed within it.
  • the collapsible core may yield inwardly under the compression exerted against it by the cast metal in cooling. While for this purpose it is preferable to make the core of corrugated metal, successful results may be attained with a shell of uncorrugated metal.
  • the present invention has been designed for the casting of cored molds of copper, for which purpose the core shell is best made of copper, yet it is believed that the invention is applicable for the casting of molds of other metals, and particularly of metals having melting points not materially higher than copper, and when such other metals are used it may be found preferable to make the core shell of the same metal as that to be cast, although for metals having not too high a melting point the use of copper for the core shell is preferable for obvious reasons.
  • An apparatus for making a cast mold having a parallel casting cavity comprising an outer mold having a cavity conforming to the exterior of the mold to be cast, a core of the shape of the object to be cast in such mold, such core comprising a shell of sheet metal with a heat-conducting filling material of comminuted metal within it, and a cooling coil within the core embedded'in such filling material.
  • the core comprising a shell of sheet metal having corrugations.
  • Apparatus according to claim 1 for the casting of a copper mold, the sheet metal core being of copper and the filling material within it of comminuted copper, whereby in case of fushion of the core and filling to the casting the latter is not contaminated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Continuous Casting (AREA)
US519936A 1931-03-04 1931-03-04 Apparatus for casting core molds Expired - Lifetime US1894983A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US519936A US1894983A (en) 1931-03-04 1931-03-04 Apparatus for casting core molds
GB3719/32A GB378332A (en) 1931-03-04 1932-02-08 Method and apparatus for casting metal moulds
FR731597D FR731597A (fr) 1931-03-04 1932-02-19 Procédé et appareil de coulée des moules métalliques
DEA65254D DE621604C (de) 1931-03-04 1932-03-03 Metallkern

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US519936A US1894983A (en) 1931-03-04 1931-03-04 Apparatus for casting core molds

Publications (1)

Publication Number Publication Date
US1894983A true US1894983A (en) 1933-01-24

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US519936A Expired - Lifetime US1894983A (en) 1931-03-04 1931-03-04 Apparatus for casting core molds

Country Status (4)

Country Link
US (1) US1894983A (fr)
DE (1) DE621604C (fr)
FR (1) FR731597A (fr)
GB (1) GB378332A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2592340A (en) * 1948-01-20 1952-04-08 Ronceray Robert Andre Apparatus for the preheating of pattern plates
US2755528A (en) * 1950-01-27 1956-07-24 Schmidt Gmbh Karl Apparatus and method for the casting of shaped articles or machine parts
US3136008A (en) * 1960-06-20 1964-06-09 Continental Can Co Apparatus and method for continuous casting of ingots having longitudinal channels and spacer member therein
US4129172A (en) * 1976-10-27 1978-12-12 Lukens Steel Company Mold for electroslag remelting process
US4278124A (en) * 1978-04-11 1981-07-14 Kawasaki Steel Corporation Method of producing hollow steel ingot and apparatus therefor
US4494454A (en) * 1982-03-16 1985-01-22 Conrad Sparks Taco Board
US5522448A (en) * 1994-09-27 1996-06-04 Aluminum Company Of America Cooling insert for casting mold and associated method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005951B1 (fr) * 1978-05-26 1982-08-04 Potterton International Limited Echangeur de chaleur en fonte
DE102008002889B4 (de) * 2008-06-06 2011-12-15 Ambros Schmelzer & Sohn Gmbh & Co. Kg Verfahren zur Herstellung eines Filterelementes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2592340A (en) * 1948-01-20 1952-04-08 Ronceray Robert Andre Apparatus for the preheating of pattern plates
US2755528A (en) * 1950-01-27 1956-07-24 Schmidt Gmbh Karl Apparatus and method for the casting of shaped articles or machine parts
US3136008A (en) * 1960-06-20 1964-06-09 Continental Can Co Apparatus and method for continuous casting of ingots having longitudinal channels and spacer member therein
US4129172A (en) * 1976-10-27 1978-12-12 Lukens Steel Company Mold for electroslag remelting process
US4278124A (en) * 1978-04-11 1981-07-14 Kawasaki Steel Corporation Method of producing hollow steel ingot and apparatus therefor
US4494454A (en) * 1982-03-16 1985-01-22 Conrad Sparks Taco Board
US5522448A (en) * 1994-09-27 1996-06-04 Aluminum Company Of America Cooling insert for casting mold and associated method

Also Published As

Publication number Publication date
DE621604C (de) 1935-11-09
GB378332A (en) 1932-08-11
FR731597A (fr) 1932-09-05

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