US1316635A - nob-cross - Google Patents

Description

w. c. NORCROSS.

METHOD OF PRODUCING COMPC-SHE CASTINGS AND HS PRODUCTS.

APPLICATION FILED APR. 20. 1918.

l ,3 l 6, 6 35. Patented Sept. 23, 1919.

Ju -vent 01c UNITED STATES PATENT OFFICE.

WILLIAM C. NONCiROSS, F TEItRE HAUTE, INDIANA, ASSIGNOR TO AMERICAN MOLDING MACHINE COMPANY, OF 'I'ERRE' HAUTE, INDIANA, A CORPORATION OF INDIA NA.

METHOD OF PRODUCING COMPOSITE CASTINGS AN D ITS PRODUCTS.

vTo all whom it may concern:

Be it known that I, WILLIAM C. NoRoRoss,

..a citizen of the United States, residing at Terre Haute, in the county of Vigo and 'State of Indiana, have invented certain new and useful Improvements in Methods of Producing Composite Castings and Their Products, of which the following is a specification.

The object of my invention is the provision. of a new method of casting metals and design of pattern whereby composite castings, for instance car wheels, of two or more metals of different characteristics such as hard and soft steel, may be produced by pouring the metals in a mold.

The invention embraces, first, the method; and, second the design of the pattern for the composite casting which is its product.

or pouring of fluid metals of different char-v acteristics at diiferent points of the same mold at about the same time and keeping them separated in the mold, as by the use of a dam, until they reach a point where it is desired that they shall unite. The dam may be provided by the design or form of the pattern, as hereinafter illustrated, or,'

metal or other substances may be inserted in the mold to serve 'as a dam. In casting car wheels, for the production of which my method is particularly adapted, a new design of pattern is resorted to wherein the sand of the mold serves as the dam.

The casting produced by my method, while composite in the sense that it is made up of a plurality of metals of difl'erent characteristics, is, nevertheless, integral throughout,

. as the metals are blended at their juncture because they are poured substantially simultaneously, although with some metals it may be found desirable to pour the harder of the Specification of Letters Patent. Patented Sept, 23, 1919, Application filed April 20, 1918. Serial No. 229,752.

metals slightly in advance of pouring the softer one.

The accompanying drawing is a longitudinal, vertical section through a mold wherein a car wheel embodying a new design of pattern is shown as having been cast by my method.

. The method may be carried out, and the In a car wheel it is desirable that the tread and flange 7 be of hard metal, such as manganese steel and the body 8 and hubv 9 of softer metal, such as low carbon steel, for strength, low cost and to facilitate machining.

My method contemplates pouring the softermetal, such as low carbon steel, for the body 8 and hub 9 through a runner or gate 10 and, simultaneously therewith, or, slightly in advance of such pouring, pouring harder metal, such as manganese steel, for the flange and tread through a separate runner or gate 1.1. The high point 12 of the mold acts as a dam to separate the two metals until the mold shall have been filled 'to a point Where it is desired the metals brackets are not used, they have the plate or web of the wheel near the center of the tread. Such designs of pattern preclude the provision of a dam such as causes the metals to be kept separated in carrying out my method.

In my design I propose to have the plate near the face of the wheel and farther from the flange. In this way, I obtain a higher dam and, consequently, obtain a larger proportion of hard tread than if the plate was nearer the flange, as has been heretofore proposed. T he design of pattern according to my invention is shown in the drawing.

Preferably, the independent fluid metals should be gaged or measured so that the approximate relative quantities will be poured.

The metals unite or blend at the juncture as shown at 13 in a manner rendering them integral, it were.

I do not limit the performance of the method to simultaneous pouring of the Fluid metals nor to the predetermination of their relative quantities except where so stated in the claims.

My method enables a composite casting to be produced with the respective component metals separate and maintaining their own characteristics up to the junctures or unions between them.

' What I claim is:

1. T he method of casting a composite car wheel, consisting in forming a mold corresponding in pattern. to the car wheel to be cast, with a dam provided between the body or plate and flange or tread at a point in the general region of that portion of the mold which forms the face of the wheel, and introducing a plurality of fluid metals separately into those parts of the mold that form the body and flange and causing them to flow into contact and unite under the control of said dam in such manner as to introduce a relatively'large proportion of hard metal in the flange and tread.

2. A mold to be used in forming a composite cast car Wheel comprising a hub and plate or body portion, a tread and flange portion, said plate or body portion being located in the general region of that portion of the mold which forms the face of the wheel, thereby forming high dam portion in the region where the plate or body portion joins the tread portion, said dam portion determining the point of union or blending of fluid metals introduced into the tread-andflange and hub-and-body portions of the mold and insuring a relatively large proportion of hard metal in the tread and flange portion of the mold.

In testimony whereof I aflix my signature.

WILLIAM C. NORCROSS.

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