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Publication numberUS2978764 A
Publication typeGrant
Publication dateApr 11, 1961
Filing dateFeb 18, 1957
Priority dateFeb 18, 1957
Publication numberUS 2978764 A, US 2978764A, US-A-2978764, US2978764 A, US2978764A
InventorsHrabovsky Joseph V
Original AssigneeFord Motor Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Casting of cored machine parts
US 2978764 A
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Description  (OCR text may contain errors)

April 11, 1961 J. v. HRABOVSKY CASTING OF CORED MACHINE PARTS Filed Feb. 18, 1957 J. V. HRABOVSKY INVENTOR.

6. 6. W06 W255i ATTORNEYS FIG. 3

United States Patent CASTING OF CORED MACHINE PARTS Joseph V. Hrabovsky, Garden City, Mich., assignor to Ford Motor Company, Dearborn, Mich., a corporation of Delaware Filed Feb. 18, 1957, Ser. No. 640,840

2 Claims. (Cl. 22203) This invention relates to the foundry art and specifically discloses a process for the production of cored machine parts which machine parts are free from many of the limitations imposed upon machine designers by the inherent properties of sand based moulding materials.

This invention is especially adapted to the production of aluminum internal combustion engine parts into which are incorporated during their manufacture cast iron or steel cylinder barrels. However, this invention is not so limited and may be employed wherever it is desired to manufacture assemblies by casting a cored aluminum element around a steel or cast iron element.

To better explain this, three figures of drawing are submitted herewith in which:

Figure l is a cross sectional view of a cylinder barrel and a surrounding coolant jacket core,

Figure 2 is the structure shown in Figure 1 with an aluminum cylinder'block cast around the assemblage, and,

Figure 3 is a sectional view of the structure shown in Figure 2 after the coolant jacket core has been liquefied by heat and drained.

Reverting to Figure 1, a cylinder barrel is prepared from either cast iron or steel and in a die casting machine a coolant jacket core 11 is cast around the periphery of cylinder barrel 10. Coolant jacket core 11 is formed from zinc or an alloy which is basically zinc with mini mum amounts of alloying elements, as for example, silicon or copper.

After coolant jacket core 11 has been cast around cylinder barrel 10, the assemblage, which is depicted in Figure 1, is placed in a die casting machine and the aluminum cylinder block 12 is cast around coolant jacket 11 and cylinder barrel 10. Aluminum cylinder block 12 in cooling shrinks and in so doing makes a very firm joint between itself and cylinder barrel 10. It is essential in designing the casting to be produced by this process to so choose the mass and temperature of casting of aluminum cylinder block 12 and the mass of coolant core jacket 11 and its heat dissipating properties so that no consequential melting of coolant jacket core 11 occurs during the casting procedure.

2,978,764 iatented Apr. 11, 1961 After the assemblage shown on Figure 2 has been cast, it is then heated to a temperature intermediate the melting point of aluminum cylinder block 12 and coolant jacket core 11 and then turned on its side so that the molten metal resulting from the liquefaction of coolant jacket 11 may flow out through the opening 13 to complete the rough casting. The melting of Zinc cooling jacket core 11 in the presence of cylinder barrel 10 will result in an effective galvanizing of cylinder barrel 10 to produce a rust resistant structure. To obtain the maximum benefit from the galvanizing action it is necessary that the surface of cylinder barrel 10 be chemically clean prior to the casting thereon of coolant jacket 11 as shown in Figure l.

I claim as my invention:

1. The process of producing an internal combustion engine casting including a ferrous cylinder barrel enclosed in an aluminum cylinder block, said cylinder block being cored for the production of engine coolant passages, comprising casting around the cylinder barrel a zinc coolant jacket co-re shaped to correspond to the desired coolant passage, casting around the assembly of cylinder barrel and coolant jacket core an aluminum cylinder block, heating the cylinder block, coolant jacket core and cylinder barrel to a temperature intermediate the melting point of the cylinder block and the coolant jacket core, and pouring from the cylinder block the liquefied core.

2. The process of producing an internal combustion engine casting including a ferrous cylinder barrel enclosed in an aluminum cylinder block, said cylinder block being cored for the production of engine coolant passages, and simultaneously galvanizing the ferrous cylinder liner adjacent the coolant passages, comprising casting around the cylinder barrel a zinc coolant jacket core shaped to correspond to the desired coolant passage, casting around the assembly of cylinder barrel and coolant jacket core an aluminum cylinder block, heating the cylinder block, coolant jacket core and cylinder barrel to a temperature intermediate the melting point of the cylinder block and the coolant jacket core, and pouring from the cylinder block the liquefied core.

References Cited in the file of this patent UNITED STATES PATENTS 7 1,243,471 Willis Oct. 16, 1917 1,416,412 Pack May' 16, 1922 g FOREIGN PATENTS 7 394,662 Great Britain June 23, 1933 634,599 Great Britain Mar. 22, 1950 661,341 Great Britain Nov. 21, 1951 685,857 Great Britain Jan. 14,1953 7

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1243471 *Oct 20, 1913Oct 16, 1917Brown Hanson & BoettcherRadiator and process for making the same.
US1416412 *Feb 25, 1921May 16, 1922Doehler Die Casting CoDie-casting process
GB394662A * Title not available
GB634599A * Title not available
GB661341A * Title not available
GB685857A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3258816 *Aug 9, 1963Jul 5, 1966Adams Millis CorpDie casting hollow articles by lost core process
US4100960 *Jan 28, 1977Jul 18, 1978Technicon Instruments CorporationMethod and apparatus for casting metals
US4148352 *Jul 15, 1976Apr 10, 1979Nissan Motor Company, LimitedMethod of preparing an exhaust port arrangement of a cylinder head
US4252175 *May 25, 1979Feb 24, 1981Outboard Marine CorporationCylinder block having a cast-in core unit and process for manufacturing same
US4580616 *Dec 6, 1982Apr 8, 1986Techmet CorporationMethod and apparatus for controlled solidification of metals
US4858670 *Dec 24, 1987Aug 22, 1989Ford Motor CompanyMethod of making and apparatus for monoblock engine construction
USRE30979 *May 5, 1980Jun 22, 1982Technicon Instruments CorporationMethod and apparatus for casting metals
DE102005041410A1 *Sep 1, 2005Mar 8, 2007Mahle International GmbhVerfahren zum Beschichten der Außenfläche einer Zylinderlaufbuchse
Classifications
U.S. Classification164/9
International ClassificationB22D19/00, B22C9/04
Cooperative ClassificationB22D19/0009, B22C9/04
European ClassificationB22D19/00A, B22C9/04