USRE10850E - Method of casting car-wheels - Google Patents

Description

W. WILMINGTON. METHOD OF CASTING GAR WHEELS.

No. 10.850. Reissued July 12, 1887..

WL'bzeJJeJ,

UNITED STATES PATENT OFFICE.-

W'ILLIAM \VILMINGTON, OF TOLEDO, OHIO.

Original No. 359,705, dated ltlarch 1, 1887. Application for reissue filed June 1-1, 1887. Serial No. 241,312.

To aZ Z whom it may concern! I molten iron forming the central parts of the Be'fi m'own that I, VILLIAM \VILMINGTON, wheel the quantities of ferro-silicon necessary I 1/ ,of Toledo, in the county of Lucas and State of to insure softness, strength, and a certaindeeffect of uniting ferro-. 5

of which the following is a specification. molten iron forming the central parts of the- This invention is an improvement in the art I wheel is to cause the carbon in the said parts of casting chilled-treadcast-iron canwheels; to assume a partially-graphitic state, which and it consists in incorporating, in varying condition is opposed to chill-hardening. Gonzo quantities during the casting of the wheel,, seqnently,when the proper quantities of ferrorich ferro-silicon ofcommerce with chillhardsilicon are united, with the molten iron form-- ening cast-iron composing the different parts ing the hub and inner plate parts of the wheel, of the wheel. the graphitic condition of the carbon thus pro- Heretofore several Letters Patent of the duced prevents hardness and rigidity in these 6 I 5 United States have been granted to me upon parts-an advantage in casting car-wheels too methods for casting car-wheels, the distinctive well known to need comment.

In carrying out my invention I melt in a and finely-powdered ferro-manganese of comcupola, in the ordinary manner, the desired merce, invarying'quantities, with the difierquantity and quality of cast-iron, and from a 70 20 out parts of a car-whecl by placing the ferrosmall portion drawn into a reservoir or ladle manganese in the stream of molten iron passfor the purpose I cast trial-pieces to determine ing from the pouring-ladle, or in the basin of what quantity of ferro-si1icon will be required the mold, for the purpose of restoring to the to produce the desired effects upon the iron iron the manganese which had been more or destined to form the central portions of the 7 less oxidized by previous meltiugs of the iron. wheel. This having been determined, the The material use in my present invention, molten iron is drawn into the pouring-ladle for transfer to the mold, and thewheels are cast in the ordinary manner, with the following exceptions: \Vhen the mold isabout-one-half 8o filled with the molten iron, I place, with asuitable instrument, gradually-increasingquanti ties of rich and finely-powdered ferro-silicon into the streamrot molten iron passing from the pouringladie, orI place it directly into 85 the basin of the mold, and continue this operation until the mold is filled. I may, in the Term-manganese, which latter substance I pre fer to use in resuscitating a molten product derived from melting old or condemned carwheels, which has lost byrepeated melting a large portion of the manganese it formerly held in combination, and which largely composed the strength of the iron; but my presquantity of this element sutficient to insure the durability of the tread of the wheel, but contemplates the-combination, with an iron deficient in silicon, of a sufiicient quantity of that substance to import to the iron the degree of softness, strength, and elasticity necessary mold until the mold is-filled. for certain parts of a oar-wheel.

\Vhile hardness in the iron composing the seminatcd throughout, and by t tread of the car-wheel is absolutely necessary rent in, the molt to secure durability to the wheel, it is injurious ferro-silicon enters the mold thr to the iron composing the hub and plate parts ings in the bottom of the basin. of the wheel. Therefore I limit the quality I prefer to use the richest ferro-silicon of I00. 50 of hardness to the outer portions of the wheel. commerce, it having the least percentage of This 1' accomplish by incorporating with the iron in its composition, and consequently costas small a quantity as possible diffused thron ghout the iron composing the tread of the wheel, thus insuring hardness and durability to the. tread.

ing but little to be reduced to a powdered condition, and requiring the minimum quantity to produce the desired eflect.

Practice has shown that by incorporating with suitable molten shown a cross-section of a chill-hardening eastiron In the drawing 15 3c in the basin of the mold during the casting of mold for a single-plated ear-wheel. A repre the wheel, say, four pounds of about eight per show the cent. finely-powdered ferro-silicomvery benebottom of the basin leading ficial effects are produced upon the iron composing the hub and inner plate parts of the' wheel; but ferro-silieon being an artifieiali The method of casting chill-tread cast-iron product, its quality is not always correctly car-wheels,whieh consists in forming the tread given. Therefore I do not confine myself to portion of the wheels by pouring chill-hardenthe exact quantity named, but use such quadv ing cast-iron, and forming the remaining portities as the molten iron may require to protions of the wheels by pouring such iron comd-uce the best results; nor do I confine myself mingled with ferrosrhcon in varyin anti-- openings in-"the into the mold.

\ sents the basin of the mold, and B B Having described my invention, I claim-- to any exact period in the pouring to the mold ties, whereby said substance is suita inibefore commencing to incorporate ferro-silicon parted to the portions ,of the wheels requiring with the inflowing iron, but I begin at that i it, substantially as set forth.

period in filling the mold which practice shows In testimony whereof I hereunto set my hand 5 to be best calculated to effect the most heme and seal.

ficial result upon the character of the wheel \VILLIAM \VILMINGTON. [I s.] being cast. \Vitnesses:

ALEXANDER \Vnnnn'. I LINCOLN HAYS.

Gare mustbe taken when incorporating the ferro-silicon with the intlowing iron to have

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