US46371A - Machine for rolling metal - Google Patents

Description

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N.PETERS, PHOTO-LITHOGRAPHER WASHINGTON D C i UNITED VSTATES PATENToF-Ficn.

HENRY MANN, OF PITTSBURG, PENNSYLVANIA.

MACHINE FOR ROLLING METAL.

Specification forming part ot' Letters Patent No. 46,37 I, dated February 14, 1865.

To all whom it may concern:

Be it known that I, HENRY F. MANN, of the city of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in the Arrangement of Rolls for Rollin g and Stretching Metals; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l is a front elevation of a set of rolls arranged in the manner which I propose. Fig. 2 is an end view or elevation of the housing and rolls shown in Fig. l. Fig. 3 is a cross-section through the rolls at right angles to their axis through the line x Fig. 1. Fig. 4 represents a modification of my invention, being a cross-section of a set of rolls Where two small-diameter working-rolls are employed. Fig. 5 represents another modifica tion of my improvement, being a cross-section` through a set of rolls, and illustrating the difterence between my arrangement and tha-t ordinarily adopted. Fig. 6 is a cross-section through a set of rolls arranged in the manner in use before my invention.

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

My improvement is applicable to the arrangement of rolls for rolling, stretching, or forming sheets, bars', or pieces of iron, copper, or other metal, well known as three-high7 rolls, as well as to the more common arrangement of a pair of rolls. ln either case the horizontal axes of the working-rolls are situated in the same vertical plane, and colisequently their points of contact are in the same plane. It is manifest, therefore, that the number of rolls high (of working-rolls) which constitute the set forms no partof my invention.

In the rolling of metals, especially in the formation of sheet metal and hoop-iron, it is well known and has been for many years that the employment of rolls of small diameter is very advantageous, turning out much better work than where rolls of large diameter are employed. 'Ihe reason of this is that, as in stretching or shaping metals by means of rolls the rolls sink into the body of the metal, the rolls of large diameter present practically a broader surface to the metal passing beA tween them, or, in other words, the metalbeing rolled comes in contact with more of the surface of the roll than is the ease with rolls of less diameter. The consequence is that the metals are more easily and rapidly reduced and stretched by rolls of small than by rolls of larger diameter, and that the work can be more efficiently and rapidly eifected and with less power with the small rolls.

In rolling heavysheets or plates of iron, however, rolls of small diameter will not an. swer the purpose when used in the ordinary way, because the small roll will spring in the middle and thus produce faulty work. The same difliculty is also experienced where sheet metal is rolled, the width of the shect requiring too great a length of rolls and con.-

sequent distance between the housings to per-v mit theuse of small-diameter rolls, for where the rolls are long they will, if of small diameter, yield in the center, as before described, and roll out the metal of uneven thick ness, stretching it more at the edges than inf the center of the sheet.

My invention is designed to remedy the difficulty and enable one or more rolls of small diameter to be used, of any required lengt-h, with the same ease as the larger-sized rolls, and with greater advantage.

Before explaining the mede in which I put my invention in practice, I will proceed to ex-` plain the method heretofore practiced, with. aj View to obviating the difficulty experienced in the use of long rolls of small diameter.

Fig. 6 represents two small-diameter rolls, aH

a', with two rolls of larger diameter, b b', all placed with their axes in the same vertical plane. The rolls b b are of sufficiently large diameter to sustain the pressure on the sin allerdiameter rolls a a', caused by the passage of the metal between the two small rolls, or between one of the larger rolls b and one of the.

smaller rolls @,but as these rolls only touch at the tangential point the effect of the pressure of the rolls as the metal sheet passes between them is to cause the two small rolls to yield horizontally in the direction in which the metal sheet or plate is passing, and the effect y of this springing of the small rolls out from between the larger rolls is to destroy their eiiciency. l

The same consequence results from the use Fig. 2,) and the pressure o1 tne screws li, nei lng applied to the bearing-block e, is communicated by the supporting rolls d (l to the upper small-diameter roll, a. The axes of each pair of supportingrolls are a little farther apart than the diameter of those rolls,' so that their peripheries may not touch each other, but they both revolve in contact with' the small-diameter working-roll, which they support. The surface speed of the supportingrolls el d is the same as that of the small-di` ameter operative roll a, although the diameter may differ.

A modication of the arrangement just described, or, rather, an adaptation of the supporting-rolls to the use of two smalldiameter rolls, is shown in the sectional Figs. 3 and 4. In the former figure a large diameter workingroller is placed inconnectionwith two small-` diameter working-rollers, a and a', in which case the metal plate c, to be operated upon, is passed in one direction (see arrows 2) between the upper small-diameter roll, a, and the largediameter working-roll g, and is returned in the reverse direction (see arrows 3) between the largediameter working-roll g and the lower small-diameter roll a. Above the upper small-diameter roll, a, are placed two supl porting-rolls, d d, arranged as in Fig. 5, and,-

two supporting-rolls, d d', areplaced `below the lower small-diameter roll, a', their journals turning in bearings in the lower part of the housing, as shown in Fig. 2. a

Fig. 4 illustrates the mode of arranging the rolls where` two smallediameter rolls, a a', are

used without the intermediate large-diameter workingfroll, g. The relative situation ofthe supporting-rolls (1 d and d d to the two smallandy 1n the direction or tue arrow z 1n ,n ig. 3, or between the rolls a anda in the d1rec tion of the arrow 4 in Fig. 4, the `upward press-1,

y 1. ,The use of' two supporting-rolls or their` equivalent,` placed with their surfaces in contact with that of small-diameter workinglrollsy placed above the upper small-diameter workf ing-roll andbelow the lower one, whether an intermediate roll of larger diameter is used or, not, for the purpose of supportingfvorkingrolls of vvsmall `diameter .for rolling metallic sheets, bars, or plates, substantiallsr inthe manner hereinbefore described.

2. Theuse of two small-diameter rolls,in.

combination with an intermediate roll oflarger diameter, the small-diameter rolls beingdsup:4 ported as hereinbefore described, the term` small diameter7 being used relativelyfto the diameter of the larger roll, and not, as otherwise,` limiting or defining the diameter of` the smaller rolls. g

In testimony whereofI, the saidHENRY F. MANN, have hereunto set my hand.

` H. F. MANN.4

Witnesses:

W. BAKEWELL, WM. D. LEWIS.

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