US922793A - Malleable-iron casting and method of making same. - Google Patents

Description

J. J. MANNING & J. W. STEPHENSON.

MALLEABLE IRON GASTING AND METHOD OF MAKING SAME.

APPLICATION FILED MAR. 4, 1907.

Patented May 25, 1909.

2 SHEETS-SHEET 1.

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J. JQMANNING 8:]. W. STEPHENSON. MALLEABLE IRON CASTING AND METHOD OF MA'KING'SAME.

APPLICATION FILED MAR. 4, 1907.

922,793. Patel fled May 25, 1909.

2 SHEETS-SHEET 2.

INVENTORS UNITED STATES PATENT FFICE.

JOHN J. MANNING AND JOHN W. STEPHENSON, OF TOLEDO, OHIO, ASSIGNORS TO THE NATIONAL MALLEABLE OASTINGS COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

MALLEABLE-IRON CASTING AND METHOD OF MAKING SAME.

Application filed March 4, 1907.

Specification of Letters Patent.

To all whom it may concern:

Be it known that we, JOHN J MANNING and JOHN W. STEPHENSON, both of Toledo, Lucas county, Ohio, have invented a new and useful Malleable Iron Casting and Method of Making the Same, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a side elevation of a casting produced in accordance with our invention; Fig. 2 is a to plan view, partly in horizontal section; an Fig. 3 is a perspective view showing the inner face of the core by which the inserts are supported.

A serious objection has been found in the use of journal boxes made of malleable cast iron when applied to pedestal trucks, in that the softness of the malleable iron causes it to wear rapidly, and in a relatively short time the box must be taken out and scrapped. We have discovered means by which these difficulties can be overcome, and the journalbox provided with a durable wearing face which will enable it to outlast the ordinary malleable box and does not entail any objectionable features in the way of expense or difficulty of manufacture.

To this end our invention consists in inserting in the box during the operation of casting at the places where the wear is to be resisted, a piece of cast iron or high carbon steel of such composition that it will resist the annealin process and will not be converted there y into malleable iron. The annealing process therefore converts only the main body of the box into malleable iron giving to it the desired qualities of strength and toughness, while the inserted piece of cast iron retains its original properties of hardness and resistance to wear, and being an integral part of the box it does not substantial y increase the expense, nor render the box objectionable by reason of multiply ing the parts. The composition which we prefer to use for the inserted cast iron piece is cast iron containing more manganese than is contained in cast iron from which malleable boxes are made. We can make such composition conveniently by adding to the ordinary mixture which is employed for making the cast malleable boxes suflicient manganese to make the total manganese in the iron from 2 to 4 per cent, and we cast the resistance piece from material of this composition, which we find is not substantially altered by the annealing process. A greater percentage of manganese may be employed.

Instead of the manganese compositions we may employ resistance pieces of high carbon steel, such as is used in the manufacture of j ournal-box springs, which steel we have found is not so softened by the annealing of the j ournal-box as to become as soft and subject to wear as the box itself. It resists the softening action of the annealing to a greater extent than does the cast iron of the box.

In the drawing, 2 represents a j ournal-box of malleable cast iron having, on its sides, vertical grooves 33 for the pedestals of the truck. In casting this box, we employ a core such as shown in Fig. 3, which is made of baked sand or suitable core-making material and having vertical projections 3 which are counterparts of the grooves to be produced. Before assembling this core in the mold, we set on the projections 3 U-shaped pieces or clips of high carbon steel or manganese iron 44, which embrace the sides of the projections, to constitute facings therefor. These pieces are not continuous along the length of each projection, 3, but are discontinuous, so that their presence will not cause the rupture of the casting when it shrinks. The core to which the pieces 4 have been applied in this manner is then assembled in the mold, and when the molten metal is cast it will surround the pieces 4 and will embed them therein, in the manner shown in Fig. 2 of the drawing so as to produce pedestal grooves having facing pieces of material which will remain resistant after the annealing operation and will insure a long period of usefulness to the box.

One of the important features of this invention resides in the fact that the insert is retained in position by the shrinkage of the molten metal, thereby avoiding extraneous fastenings.

We claim 1. An annealed malleable casting having an insert capable of resisting annealing included as a solid piece in the casting during the formation thereof; substantially as described.

2. An annealed malleable casting having an insert capable of resisting annealing to a greater extent than the material of the casting included as a solid piece in the casting during the formation thereof; substantially as described.

3. The herein described method which consists in including a solid insert capable of resisting annealing in the casting during the formation thereof, and then. annealing the casting with the insert therein,

4. The herein described method which consists in placing in a mold an insert capa ble of resisting annealing, pouring the mold and thereafter annealing the casting with the insert therein, substantially as described.

5. The herein described method which consists in including in a journal box channel during the casting of the box solid guide elements which are capable of resisting annealing to a greater extent than the material of the box, and then annealing the box With the guide elements therein.

6. An annealed malleable casting having an insert of high carbon steel capable of resisting annealing included as a solid piece in the casting during the formation thereof, substantially as described.

7. The herein described Vmethod which consists in including a solid insert of high carbon steel capable of resisting annealing in the casting during the formation thereof, and

then annealing the casting with the insert therein, substantially as described.

In testimony whereof, we have hereunto set our hands.

Witnesses:

ADOLPH F. SEUBERT, MARK KUEHN.

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