US1374509A - Art of hardening metal - Google Patents

Description

UNITED. STAT-TIES,

HAROLD A. LOMAX, or rrrrsnunen, rEn'NsYnvaura.

ART OF. HA RDENING- METAL.

Specification of Letters Patent.

Patented A r. 12, 192 1.

Application filed October 10, 1919. Serial No. 329,700.

To all 10 ham it may concern:

Be it known that I, HAROLD A. LOMAX, 'a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in the Art of Hardening Metal, of which the following is a specification.

My invention consists of an improvement in the art of hardeningsegregated portions or areas of cast metal by the incorporation therewith of a controlling alloy. As is well known, the combination with a base metal, as iron or steel, of a suitable alloy or alloys produces results as to hardness, tensile strength, or otherwise within wide ranges, 1

depending on the kind and quantity of the alloys used. In the manufacture of rolls, dies, plates, anvils, etc., it is desirable to provide a very hard surface coating at one or more sides with a comparatively soft interior body and such result is commonly effected by the use of alloy 01' alloys mixed with the entire'batch or charge from which the casting is made, either with or without the well known chill treatment in the easting operation, or by accompanying heat treatment, or other means.

My invention has in view to greatly reduce the proportionate quantity of relatively expensiv alloy or alloys compositions or compounds by applying the same to the surface or surfaces only, and to limited depths, by fusion therewith of limited quantities, so supported or located within the mold, either sand or chill, that the alloy will be incorporated with the selected surface portions of the casting in the formative operation, and will be fixedly combined therewith in the resulting casting.

In carrying out my invention I utilize any suitable supporting framework, as wires, rods, networks, expanded metal, or the like, with which the alloy is associated, so ar ranged within the mold at its outer portions that the molten metal will absorb and fuse the alloy and its supporting framework and embody it at such portions in the exterior or working portions of the casting, the main interior body portion remaining unaffected.

In the drawings, which are merely typical embodiments of the invention as applied for instance to a roll,

Figure 1 is a vertical sectional view of a roll casting mold utilizing my invention, as applied to a straight faced roll; 1

Fig. 2 is apartial similar view showing the invention as used with a beam roll; and

Figs. 3 and 4 are detail views showing portions'of one. available form of the alloysupporting framework with the alloy carried thereby.

The castingmold 2 of sandis formed within the flask 3 in theusual way providing the interior casting cavity 4: and any supplemental portions thereof, to which th molten metal is supplied by-the usual conduit, as is commonly practised in this art. Within the mold cavity and adjacent to the outer portions thereof, or wherever it is desired to combine the alloy with the casting, I arrange and suitably support'the alloy carrying framework 6.' This may be of various suitable material, as wire netting,

rods, 01- the like, and in or upon this frame work the alloy or compound is carried, as indicated at 7, Figs. 3 and 4. l

The alloy isjpreferably in comminuted, powdered, or fragmentary form, and mixed with any suitable neutral binder, as molasses, or the like, whereby it maybe held together and attached to the frame 6. The frame, so charged with the alloy or com pound is then arranged within the mold car ity around and adjacent its inner walls so that the molten metal will absorb and fuse both the frame and alloy, dissolving the elements, and combining them at the same relativelocations only. If preferred, the

framework may be composed of a metal in which is incorporated a suitable alloy, so that the metallic frame itself will impart the desired effect to the casting, when melted. By this operation, the casting will become hardened or otherwise affected, dependent on the alloy used, .at such portions only, leaving those portions as the interior, which are remote from the alloy zone, unaffected.-

It will, of course, be understood that two or more layers of the framework may be utilized or the quantity and depth of the alloy may be graduated to suit the objects.

in View by the skilled metallurgist or foundryman. Also, that it may be applied v and embodied .in the resulting casting in any manner desired, depending on the ex-v pected results, as to "the controlled surfaces or portions. The advantages of the invention reside in the ease of control, economy of alloy, and the facility of treatment of a wide diversity of shapes or designs'of castings.

1 ing a mold, locating and supporting an al-- What I claim is: i

1. The process of casting metals consisting in supporting a portion of alloy within a mold at predetermined locations thereof and fusing th same with the molded metal of the casting. 2. In metal casting, the process of formloy within the mold, and then filling the cavity of the mold with molten metal and amalgamating the alloy with the metal in the resulting casting at portionsoccupied by the alloy Within the mold.

3. In metal casting, the process of forminga mold, locating a supporting framework embodying an alloy within the mold at predetermined locations with reference to its embodiment in a resulting casting, and

- then filling the cavity of the mold with molten metal and amalgamating the framework and alloy with the metal in the resulting casting at portions approximating the original location of the alloy.. 7

In testimony whereof I hereunto aflix my signature.

'- HAROLD A. LOMAX.

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