US1938995A - Built-up roll - Google Patents

Description

Patented Dec. 12, 1933 PATENT OFFICE BUILT-UP ROLlJ Ross E. Beynon, Chicago, Ill.

Application August 17, 1931.

4 Claims.

The invention relates to improvements in rolls for reducing iron and steel to thin plates or strips. Rolls for the above purpose are subjected to severe usage and wear rapidly, requiring frequent 5 regrinding or re-surfacing. Such rolls have been constructed of a shaft having suitably fitted thereto a sleeve or shell tempered and polished on its outer surface for providing the working surface. Due to the severe strain to which the rolls are subjected in operation the shell soon loosens on its shaft, requiringextensive repairing and frequent stopping of the rolling mill.

It is to this class of rolls that the present invention relates.

An object is to provide a construction which will facilitate the casting and heat treating of the shaft and outer shell.

Another object is to provide a built-up roll in which/the shell and shaft are provided with double inter-fitting tapers preventing loosening and slipping of the shell under severest strain.

A yet further object is to provide a roll formed of a shaft and shell, the latter having at one end an enlarged inside diameter permitting easy assembly of the shell on the shaft for a shrink fit.

A yet further object is to provide a built-up roll as described having a double taper shrink fit of the wearing surface on the shaft with a clearance portion between the shaft and inside surface of the shell spacing the tapering portions, whereby expansion of the shell due to the center becoming warmer prevents loosening of the same on the shaft.

With these and various other objects in view, the invention may consist of certain novel features of construction and operation as will be more fully described and particularly pointed out in the specification, drawing and claims appended hereto.

In the drawing which illustrates an embodiment of the device and wherein like reference characters are used to designate like parts- Figure 1 is an elevational view showing the roll constructed according to the present invention, and

Figure 2 is a longitudinal sectional view taken Serial No. 557,871

faces. The portions comprise frustra of a circular cone and are constructed to provide surfaces of equal taper and in which the portion 16 slopes inwardly to oppose the inwardly sloping taper on portion 18. In order to facilitate assembly of the roll, as will be more particularly described, the tapering portion 18 is provided at its inner end with a diameter indicated by A+. The inner diameter of portion 16 is indicated by A- so that it will be evident that the average diameter of the tapering surface provided by portion18 is larger than the average diameter of the surfaces provided by portion 16.

Fitted to the arbor 10 is a shell 20 formed of metal, and heat treated so as to provide a hard, durable working surface which can be ground and polished to a high degree. The shell thus provides the working surface for the roll and due to the severe usage to which it is subjected during the operation the outer surface soon wears, requiring frequent regrinding and repolishing. This as' well as the heat treating of the shell is facilitated by the present invention since the same is cast separate from the arbor and can be worked into shape more easily than if the shell and arbor were cast integral. The interior surface of shell 20 is provided with tapering portions 22 and 24, each portion extending from the end of the shell inwardly. The portions 22 and 24 thus form tapering surfaces adapted to interflt with the tapering surfaces provided on the arbor. For separating the tapering inter-fitting surfaces the shell is provided with a portion of enlarged diameter 26, formed on its interior surface and centrally of the same. Since the diameter of the arbor at 28 is substantially less than that of the portion 26 provided in the shell, a clearance space 30 is formed between the parts.

In fitting the shell 20 to the arbor by means of a shrink flt the shell is heated to expand the same and is then telescoped over the left hand end of the arbor with the portion 24 of the shell leading. Due to the enlarged diameter of this end of the shell and the fact that the sameis somewhat expanded by heat, passage of this end over the tapering surface on the arbor formed by portion 16 is easily accomplished. When the parts are completely assembled the tapering surfaces of the shell and arbor inter-fit and with the contraction of the shell by cooling a tight fit of the same on the arbor results. This double taper fit of the wearing surface to the arbor inwhich the tapers are in opposite directions prevents anypossible slipping of the shell sideways of the arbor, due to side thrusts and withstands the severest strain to which these rolls may be subjected in use.

By the present inventiona roll is provided having an outer shell of harder material than its core, which will permit of wearing out of several shells before the core is unfit for service. Easy assembly of the parts for fitting the shell to the arbor is accomplished through the structure described, and by means of the clearance provided centrally oi the shell expansion of this portion due to the intense heat to which it is subjected is permitted without permitting the expansion to materially ail'ect the tapered portions 01 the shell. This clearance, in combination with the double taper, results in a tight ilt at all times between the working surface and the means by which the roll is journaled.

It is to be understood that I do not wish to be limited by the exact embodiment of the device shown, which is merely by way of illustration and not limitation, as various and other forms of the device will of course be apparent to those skilled in the art without departing from the spirit of the invention or the scope oi the claims.

I claim:

1. In a roll for rolling sheet metal, an arbor provided with spaced tapering portions intermediate its ends, a shell fitted to the arbor by a shrink fit, said shell having tapering portions on its interior surface tapering to a smaller diameter inwardly ot the shell and said portions interfitting with the tapering portions on the arbor.

2. Ina roll for rolling sheet metal, an arbor provided with spaced portions tapering in opposite directions, a shell fitted to the arbor by a shrink fit, said shell having tapering portions on its interior surface tapering to a smaller diameter inwardly cf the shell, the tapers terminating to provide a portion of enlarged diameter centrally oi the shell, the tapering portions on the shell and arbor inter-fitting with the portion of enlarged diameter forming clearance between the parts.

3. In a roll for rolling sheet metal, an arbor provided with spaced tapering portions, a shell having tapering portions on its interior surface for interiltting with those on the arbor, said portions tapering in opposite directions and one of said interlitting portions having a larger average diameter than the other to permit assembly oi the parts.

4. In a roll for rolling sheet metal, an arbor having journals formed on its outer ends and tapering portions spaced from each other intermediate its ends, a shell provided with spaced tapering portions on its interior surface, said shell having a shrink fit on the arbor, the portions on both arbor and shell tapering in opposite directions and interfltting, and the average diameter or said interfltting portions being unequal.

ROSS E. BEYNON-

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