US1132612A - Apparatus for making composite rolls. - Google Patents

Description

I J. T. OSLER. APPARATUS FOR MAKING COMPOSITE ROLLS.- APPLICATION FILED DEG.'18, 191s.

Patented Mar. 23, 1915.

FIG-1 All;

INVENTOH WITNEI/SEES j W/ THI mums PETERS G1. PHOTGLITHO" WASHINUIUII, u. x.

J'AY '1. OSLER, OF CORAO-POLIS,

PENNSYLVANIA.

APPARATUS FOR MAKING COMPOSITE ROLLS.

Application filed December 18, 1913.

To all whom it may concern:

Be it known that I, JAY T. OSLER, resident of Coraopolis, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Apparatus for Making Composite Rolls, of which the following is a specification. This invention relates to apparatus for making composite mill rolls, and particularly mill rolls having a core or center of one metal. such as steel or the like, and a body or shell of another metal, such as cast iron, said core and body being welded together into a single integral structure.

The object of the invention is to provide simple apparatus whereby a heated metal core may be introduced at the proper temperature into a mass of cast metal which forms the roll body, whereby also said core is cleaned or freed from scale and oxid just before entering the cast metal and is also accurately centered in the mold cavity, and which apparatus is easy to manipulate and will insure that the core is at the proper temperature for working whenever the molten iron is in condition for casting and will prevent loss of heat by the core in transferring the same to and introducing it into the mold from the heating furnace or the like.

The invention comprises the construction and arrangement of parts hereinafter described and claimed.

In the drawings Figure 1 represents a sectional elevation of the apparatus, and showing the heating furnace in place over the mold cavity; Fig. 2 is a detail sectional elevation, on a larger scale, of the centering guides and cleaners; and Fig. 3 is a horizontal section on the line 33, Fig. 2.

The roll is formed in a mold which may be arranged for casting either chilled or annealed rolls, and in the drawings is shown arranged for casting chilled rolls. It comprises a body chill 1 and neck sand portions 2, which are suitably clamped together and rest upon a base or bottom 3, the bottom of sand portion 2 being preferably formed with a conical depression or cavity to receive the pointed end of the core or billet. The molten metal for forming the body of the roll is introduced into the mold through a runner 4 which enters the bottom Specification of Letters Patent.

Serial No. 807,470.

of the mold. Said runner is provided with an overflow gate 4* through which excess metal displaced by the core may run out. Supported upon the upper end of the mold is a casing or shell 5 within which is located the centering rig for cleaning the core and for also centering it in the mold, cavity. This centering rigmay be of any desired construction, but preferably comprises two or more superposed sets of pivoted arms 6, having counterweights 7 at their outer ends, and having their inner ends arranged to en- Patented Mar. 23, 15915..

gage the core and center it as it is lowered into the mold. Each set preferably comprises three or more centering fingers, and

the fingers of the two sets are in staggered relation with each other. Each set of fingers completely surrounds the core or billet and not only centers the same but also frees it from scale and oXid and cleans its surface as it passes therethrough, so that it will readily and completely weld or unite with the-molten metal for forming the body. The upper end of the casing 5 is preferably closed by a shield or cover 9, which is in the form of a sliding gate or door and arranged so that it can be moved into position to close the upper end of the casing or the lower end of the heating furnace, as hereinafter described, or may be withdrawn from the casing when it is desired to deliver thecore into the mold.

The heating furnace is represented at 10, and preferably comprises a cylindrical casing or jacket tory material, such as fire brick or the like. The furnace is heated by means of any number of suitable burners arranged in any suitable manner. The lower end of the fur nace is arranged to rest upon the top of the casing 5 and is closed by the gate 9 before referred to. The upper end of the furnace is preferably provided with suitable means, such as the trunnions 14:, by means of which it may be lifted and transported from place to place.

In use of the apparatus a core 15 is slowly heated up'to the proper temperature, say 2200 degrees Fahrenheit, and in such a manner that the heat penetrates through. the core and is not merely on its surface. This may be done in an ordinary furnace, or directly in the portable furnace 10. In the 11 with a lining 11 of refracformer case the billet is first heated in the ordinary furnace to about the proper temperature and is then removed and placed in the portable heating furnace 10, which is then carried to and placed in position on top of the mold in the position shown in Fig. 1, where the core is finally heated to the proper temperature. In the second case the billet is placed directly in the portable heating furnace and is there heated to the proper temperature. It will, of course, be understood that the core 15 may be made of any suitable material, but preferably it is formed of soft or mild steel, possessing the properdegree of toughness and resiliency to withstand heavy strains without breaking.

The body of the roll is formed of cast iron,-

which is heated in any suitable melting furnace or cupola to a little higher temperature that the core or center 15, say to about 2400 degrees Fahrenheit. When in the proper condition it is poured into the spout A and underteemed into the mold. It immediately begins to transmit its heat to the chill 1 and chill on its outer surface. Gate 9 is now withdrawn to open up the lower end of the heating furnace 10. Core 15 is now lowered into the mold. Its lower end is conical or pointed, as at 17, and first strikes the inner ends of the upper set of arms 8 which swing outwardly on their pivots and hold the core in central position. They also preliminarily scrape the billet and free it. from scale. The second set of arms next encounters the core and assists in cleaning and centering the same. The core is lowered until its pointed center seats in the conical depression in the bottom 3, with the core in a central or axial position in the mold cavity. In sinking, the core displaces the molten metal along the axis or center of the mold and forces it out through the overflow gate A. By the time the core seats in the mold the molten metal is cooled down until it is at practically the same temperature as the core. Both the core and body then begin to cool at substantially the same rate. The chill 1 pro duces a hard chilled surface on the body of the roll and the high temperature produces an intimate weld or union between the body and core.

If desired, an annular wire brush 20 may be placed near the top of the mold, through which the core passes, and which assists in cleaning the core. This, however, is not essential.

It will, of course, be understood that the co-efficients of expansion of cast iron and steel are slightly different. Consequently, in cooling, the cast iron body oi the roll contracts a little less than the core, thereby placing the core under an initial tensile stress, which becomes more and more fixed and pronounced as the roll cools down. Similarly, the body is placed under slight longitudinal compression, due to the same difference in contraction.

When the roll has completely cooled the extra lengths at the ends of the core are cut off and the roll is turned down to final shape.

The apparatus described may be used for making either chilled or unchilled rolls by merely using the proper type of mold. The arrangement has the advantage that the core for torming'the roll center can be heated up to and kept at the proper temperature until the molten metal for the body is determined to be in the proper condition for casting and can then be transferred into position in the mold without appreciable loss of heat, thereby permitting the heated core and body to be brought together at substantially the same temperature. This prevents allotropic changes in the metal during cooling thereof and produces a roll of high strength and durability and not liable to easily rupture or break in use.

The apparatus also insures a complete weld between the core and body, as the heated billet is cleaned and freed from scale or oxid just before it is introduced into the molten metal for the body. Also, the core is centralized in the mold so that it is surrounded on all sides by an equal thickness of body metal, thereby doing away with the necessity for cutting away an undue proportion of the body metal in turning the roll.

The apparatus is simple and can be readily manipulated and does not appreciably increase the cost of the roll.

The method of making rolls herein described forms the subject matter of my companion application for method of making chilled rolls with steel center, filed of even date herewith, Serial No. 807,469.

lVhat I claim is:

1. Apparatus for making composite rolls, comprising a mold arranged to receive a core for forming the roll center, and movable arms for centering said core as it is introduced into the mold.

2. Apparatus for making composite rolls, comprising a mold arranged to receive a core for forming the roll center, and swinging arms carried by said mold and arranged to move inwardly by gravity for centering the core therein.

3. Apparatus for making composite rolls, comprising a mold arranged to receive a core for forming the roll center, and two sets of pivoted arms supported at the upper end of said mold for centering the core therein.

1. Apparatus for making composite rolls, comprising a mold arranged to receive a core for forming the roll center, and means arranged to engage said core as it is introduced into the mold and to clean and also center the core therein.

5. Apparatus for making composite rolls,

comprising a mold arranged to receive a core for forming the roll center, a casing carried by said mold, cleaning and centering devices in said casing, and a gate for closing the upper end of said casing.

6. Apparatus for making composite rolls, comprising a mold arranged to receive a core for forming the roll center, and a heating furnace arranged to be supported by said mold for heating said core, whereby said core may be introduced directly into the mold from the furnace.

7. Apparatus for making composite ro lls, comprising a mold arranged to receive a core for forming the roll center, core cleaning devices carried by said mold, and a furnace supported by said mold above said cleaning devices, whereby the core may be Copies of this patent may be obtained for five cents each, by addressing the Washington, D. G."

cleaned as it is transferred from thefurnace JAY T. OSLER.

Witnesses:

ELBERT L. HYDE, GLENN H. LERESCHE.

Commissioner of Patents,

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