US1895533A

US1895533A - Composite metal article and method of making same

Info

Publication number: US1895533A
Application number: US397971A
Authority: US
Inventors: Glen D Bagley
Original assignee: ELECTRO METALLURG CO
Current assignee: ELECTRO METALLURG CO; ELECTRO METALLURGICAL Co
Priority date: 1929-10-07
Filing date: 1929-10-07
Publication date: 1933-01-31
Anticipated expiration: 1950-01-31

Description

Jan. 31, 1933. D BAGLEY 1,895,533

COMPOSITE METAL ARTICLE AND METHOD OF MAKING SAME Filed Oct. 7, 1929 ATTORNEY Patented Jan. 31, 1933 UNITED STATES PATENT OFFICE- GLEN ID, BAGLE'Y, OF GREAT N EGK, NEW YORK, ASSIGNOR TO ELECTRO METALLURGICAL COMPANY, A CORPORATION OF WEST VIRGINIA COMPOSITE METAL ARTICLE AND METHOD OF MAKING SAME Application filed October 7, 1929. Serial No. 397,971.

My invention relates to a composite metal article having a hard exterior and a softer core, and a method of making the article in which the core in preformed, and molten metal is poured around the core.

It is often desirable that the rim or outer surface of articles such as'car wheels and metal rolls for rolling out or crushing hard materials should'be formed of hard cast unmachineable metal, and the interior or core of these articles be formed of a softer machineable metal. After the casting is made, a bore in the core .of the article may be ma chined and ground, and the article may be driven or shrunk upon a shaft. The surface of the article may then be ground as required.

In the manufacture of such articles, it is important that a firm union be made between the rim metal and the core metal. To accomplish this result it is economically important that the rim metal be cast in contact with the core metal. As is well known, cast ferrous metal upon cooling from the molten state contracts, and provision must be madefor the free contraction of the metal in order to avoid detrimental internal stresses being set Therefore, the principal object of my in vention is to cast a rim of unmachineable to freely contract with the metal rim.

Other objects of my invention will be understood from the following. description and accompanying drawing in which:

Fig. I is an end view of a roll and Fig. II is a section through Fig. I on line IIII.

According to my invention, a rim of metal 1 adapted to become unmachineably hard upon cooling is cast around a metal core 2 'made in r adial'sections 3. A plurality of lugs 4 are welded to the outside of each section ofthe core. These lugs become embedded in the cast rim of the roll when the rim metal is-poured around the core as shown L in dotted lines in Fig. I. The sections 3 of the 'core are spaced apart and are yieldably held together by strips of metal 5 bridging the spaces and welded to the sections on Opposite sides of the spaces. A thin longitudinal sheet 50 of metal 6 covers each of the openings bemetal around a preformed metal core adapted tween the sections 3 and each sheet is welded at points along one of its edges to a single section.

The core 2 thus assembled is placed in the center of a mold and the rim metal 1 is poured around the core. The longitudinal sheets 6 covering the openings between the sections 3 retain their form sufficiently to prevent the. cast rim metal 1 from running through the openings. \Vhen the rim metal 1 cools, it contracts and decreases the space between the sections 3, and the securing strips 5 yield to permit free contraction and thus prevent stresses from being set up in the rim metal.

, After the casting has cooled, it may then be machined on the-interior of its core to the proper dimensions for mounting on a shaft. The pins 4 welded to the exterior perimeter of the core 2 bind the sections of the core securely to the rim metal 1 and permits the roll to be driven on or off a shaft by hammering the rim metal.

\Vhile I have shown only one form of my invention, other modifications or changes may be made without departing from the scope of my invention as defined in the appended claims.

' I claim:

1. A method of making a composite article having a hollow core of soft metal and an outer portion of harder metal, comprising; forming said core by providing a plurality of radial segments, welding a plurality of lugs to the outside of each of said segments, and placing said segments in a mold in the form of a circle with the adjacent edges thereof spaced apart; and pouring said harder metal, while molten, in said mold around said core.

2. A method of making a composite article 90 having a hollow core of soft metal and an outer portion of harder metal, comprising; forming said core by providing a plurality of radial segments, welding a plurality of lugs to the outside of each of said segments, placing said segments in the form of a circle with the adjacent edges thereof spaced apart, covering each space between said segments with a sheet of metal, and welding each of said sheets to one of said segments; placing said core in a mold; and pouring said harder metal, while molten, in said mold around said core.

3. A method of casting metal around a preformed sectional core to unite the core and the cast metal comprising spacing the sections of the core apart, bridging the spaces with yieldable metal strips welded to a section on each side of the space; placing the welded core in a mold and pouring molten metal about the core.

4. A method of making a composite article having a hollow core ofsoft metal and an outer portion of harder metal, comprising; forming said core by providing a plurality of segments, welding a plurality of lugs to the outside of each of said segments, placing said segments in the form of a circle with the adjacent edges thereof spaced apart, and welding a plurality of yieldablc strips to both of each pair of said adjacent edges; placing said core in a mold; and pouring said harder metal,

while molten, in said mold around said core.

5. A method of making a composite article having a hollow core of soft metal and an outer portion of harder metal, comprising; forming said core by providing a plurality of segments, welding a plurality of lugs to the outside of each of said segments, placing said segments in the form of a circle with the adjacent edges thereof spaced apart, covering each space between said segments with a sheet of metal, welding each of said sheets to one of said segments, and welding a plurality of yieldable strips to both of each pair of said adjacent edges; placing said core in a mold and pouring said harder metal, while molten, in said mold around said core.

6. A composite metal article comprising a core having its perimeter divided into a plurality of sections joined by. yieldable strips and an outer surface of cast material around said core.

7. A composite metal article comprising a core having its perimeter divided into a plurality of radial sections joined by yieldable strips, projections on each section extending from the outer perimeter, and an outer surface of cast material around said core.

8. Composite metal article comprising a metal core having a plurality of spaced apart sections, strips of metal extending across said spaces and attached to said sections on the opposite side of said spaces, and a cylindrical layerof wear-resistant cast metal around said core.

9. Composite metal article comprising a metal core having a plurality of spaced apart radial sections having projections extending from the outside of said sections, and strips of metal extending across said spaces and welded to said sections on the opposite side of said spaces, and a cylindrical layer of wearresistant cast metal around said core.

10. Composite metal article comprising a In testimony whereof, I aflix my signature.

GLEN D. BAGLEY.