US19963A - Improvement in rolling-mills - Google Patents

Description

lNrTE STATESv QATENT OFFICE.

JOHN A. BAILEY, or BOSTON, MASSACHUSETTS, ASSIGNOR To JAMES f HORNER AND JAMES LUDLUM, or NEW YORK, N. Y.

lMPROVENIENT IN ROLLING-MILLS.

Specification forming part of Letters Patent No. 19,963., dated April 13, 1858.

'hereby declare that the following is a full,

clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which-.-

Figure l is a vertical section of a rollingmill with my improvement, taken in a plane which passes through the axes ot" both rollers, but leaving the rollers entire. Fig. 2 is avertical section taken at right angles to Fig. l. Fig. 3 is a transverse section of one ot' the journals ofthe lower roller and of the two eccentrics which are thereto applied and which constitute my invention. Fig. 4 is an end view of thelower roller with its eccentrics. Figs. 5, G, 7, and S are diagrams of' the operation of the invention.

Similar letters ot reference denote like parts in all the figures.

This invention relates to the application of.

eccentrics to the journals ot one roller ot the pair Or set employed in a rolling-mill in such a manner as to effect the rolling ot articles of more or less taper form, as file-blanks or articles of parallel form, as may be desired.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

'A A are the two rollers of the mill, which are intended to be similar in all essential features to the rollers commonly employed and to be geared together in the usual manner; but their gearing does not require to be and is not shownin the drawings, as it is supposed tobe well understood.

B B are the housings-ot` the rollers. The lower roller A does not work in fixed bearings in the housings; but its journals a. a, which are concentric to its periphery, are fitted each with an eccentric C, in which it is capable ot turning freely, and to the exterior of which is fitted a second eccentric D. These eccentrics C D consist ot metal sleeves whose exteriors and interiors are cylindrical but e'ccentric to each other; but both C andD have the same degree of eccentricity. When .these eccentrics are applied to the journals, Jthe exteriors of the outer eccentrics D may be brought to a condition concentric to the journals or ot any degree of eccentricity thereto not greater than double theveccentricity of the single eccentrics by turning either eccentric of each pair C D, the said condition ot' concentricity being produced by Setting the eccentricities ofthe eccentrics C D in diametrically-opposite directions, and the greatest eccentricity by setting the eccentricities of both in the same direction, and the lesser degrees of eccentricity by shitting the eccentrics to the intermediate relative positions. Each pair of eccentrics C D is capable ot' being secured firmly together by screwbolts b h, which nass through a ange c on the exterior of C and screw into nuts CZ d, which are fitted into a cavity in D and retained therein by tongues c e, which are formed upon them in such a manner as to enter a groove turned in the back part of the cavity, as shown in Fig. l. By s-lackening the screw-bolts h h the eccentrics are left free to turn relatively to each other for adjustment, and by tightening the screws they can be secured together in any relative position. The Harige cis concentric to the exterior ot' the eccentric C and fits up to a shoulder in the cavity or" the eccentric D, which is concentric to the cylindrical interior of the latter. rlhe cylindrical exterior of each outer eccentric D is tted to a stationary bearing in the housings in the same manner as the journals of the lower roller are fitted in an ordinary rolling-mill, and cach ot` said eccentrics is turnished with a spur-gear f, which is concentric to its cylindrical exterior and which gears with one of two pinions g on a shaft E. The caps h 7l. of the bearings of the eccentrics D D contain or support the bearings for the journals of the upper roller. i

The operation ot' rolling articles of taper f'orm-as, for insta-nce, taper tile-blanks-in this machine is produced by setting the two pairs of eccentrics and securing them together, as hereinbefore described, with the cylindrical exteriors of D D at a proper degree of eccentricity to the journals datand giving the eccentrics a rotary motion at the saine time. This rotary motion causes the lower roller to approach or recede from the upper one,which it is evident must produce a taper form on the article rolled between them. The taper form thus produced is not, however, straight-sided, but curved, as shown in Figs. 5, 6, and 7. The degree of taper is to a certain extent varied by varying the eccentricity of the rollers; but the variation thus obtained is limited, and further variation has to be obtained by Varying the velocity of the rotary motion of the eccentrics relatively to that of the rollers. The former method of effecting the variation will be readily understood, but the latter requires alittle explanation. Suppose, for instance, theeccentrics make the same number of revolutions as the lower rollers, the length to which the taper could be extended would only be equal to half the circumference of the rollers, as the entire revolution would produce the form shown in Fig. 8; but as of the taper form produced by the half-revolution one-half has a concave Vand the other a convex profile, as will be seen by reference to Fig. l, the taper cannot be extended in the proper form for taper file-blanks or similar articles represented in Fig. beyond a length equal to onefourth the circumference of the rollers Without diminishing the speed of the eccentrics; but by diminishing the speed the taper may be extended to the length ofthe half or whole circumference of the rollers or even of several times the circumference, though the maximum and minimum thicknesses will be the same; or by making the velocity of the eccentric greater than that of the rollers the length of the taper will be diminished. The effects of reducing and increasing the velocity of the eccentrics relatively to that of the rollers are illustrated in Figs. 6 and 7 and will be appreciated by comparing those figures with Fig. 5.

This mode of applying eccentrics to the journals of one of the rollers of a rolling-mill may be employed for rolling many forms. For instance, any portion of a form like Fig.

8 can be produced or a series of connected repetitions of a form of the 'same character as that figure, or by an intermittent motion of the eccentrics a variety of forms maybe produced. I

If the revolution of the eccentrcs be suspended, the rollers will produce a parallel form, as the journals a ct then rotate in the eccentrics C C, as in stationary bearings, 0r if the eccen'trics be set so as to make the exteriors of D D concentric to the journals a parallel form Will be produced Whether the eccentrics are stationary or not.

rlhe only object in employing the combination of eccentrics, or, as they may be termed, compound eccentrics C D, is to enable a greater or less degree of taper to be produced-in other words, to vary the maximum and minimum thicknesses produced. Were it not for this a single' or simple eccentric might be applied to each journal, its interior tting the journal and its exterior the fixed bearing in the housings, and I should con sider this as in a measure the equivalent ot the compound eccentric.

I do not claim, broadly, the alternate raising and lowering of one or more of the rollers in rolling-mills for the purpose of producing wedge-shaped Work, for I am aware that it is common to place the ends of rollers in sliding frames and to depress or elevate the latter by separate cams.

WhatI claim as my invention,and desire to secure by Letters Patent, is;

The application of eccentrics C D to the journals a of rolling-mill rollers in the manner and for the purposes substantially as herein shown and described.

JOHN A. BAILEY. IVitnesses:

JOHN H. WELLEs, B. L. ALEXANDER.

Images