US271225A - Rolling metal rods and bars - Google Patents

Description

(No Model.)

' P. H. DANIELS.

ROLLING METAL RODS AND BARS.

No. 271,225. Patented Jan.30, 1883.

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UNITED STATES PATENT EEcE.

FRED H. DANIELS, OF WORCESTER, MASSACHUSETTS.

ROLLING METAL RGDS AND BARS.

SPECIFICATION formingpart of Letters Patent No. 271,225, dated January 30, 1853,

Application filed August 20, 1881. (No model.)

To all whom it may concern:

Be it known that I, FRED H. DANlELS, of Vorcester, in the county of \Vorcester and State of Massachusetts, have invented certain new and useful improvements in the method of and mechanism'for preventing the formation of fins on rolled metal bars and rods by continuous process of rolling; and I declare the following to be a description of my said invention snfficiently full, clear, and exact to enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

In the operation of continuous-rolling mills as ordinarily constructed and arranged for rolling metal bars or wire rods, the action of the mill, while it effectsthe proper shapingof the rods throughout the greater portion of their length, fails to impart the required perfect shape to portions of the rod near its ends or to so much of the rod as escapes the maxim um pulling action or tensile strain of the several consecutive pairs of rolls while the ends of the rod are passing into or out of the machine, so that in ordinary practice in the rolling of wire rods by continuous process there are about four feet on the first end and eight feet on the last end (more or' less) of each rod whereon side fins are left by the rolls. These fins are very objectionable in the finished prod not, as they prevent the subseq uentcolddrawing of the rods through dies. Consequently the imperfect or finned portions require to be cutoff and rejected, thus causing a loss or waste of some two or three 'per cent. in the production of the mills, and also requiring lab'or and expense for handling, cutting up, and

reconverting the wasted portions.

The object of my present invention is to obviate the above-mentioned defects in the construction and operation of continuous-rolling mills and to provide a method of rolling metal bars or rods by continuous process whereby uniformity of action or result throughout the entire length of rod can be attained, the finning or irregularities near the ends of the rodsprevented, and the consequent loss and waste avoided.

t The nature of my invention consists in a method of rolling wherein the bar or rod'is subjected during its passage through the continuous-rolling mill to the action of one or more pairs of tin-repressing rolls located immediately following or working'auxihary to the ordinary rod-reducing rolls, or any particuv 'lar pair of them, and adapted for pressing in the fins or projections without materially In the accompanying drawings are illus-.

trated.the relative arrangement of the reducing-rolls and fin-repressing rolls, and the reiative shapes or sections of the rod, both atits central and end portions, as imparted by the mechanism at the various stages of its action and by my improved method also the corresponding shapes of the rod as made by the ordinary practice. The set of sections No. 1

show the forms of the grooves and the shape of the rod as in the tour last rolls ot'a continuous-rolling mill for rolling wire rods in ordinary use. The views in sets No. 2 and No. 3 illustrate the arrangement of rolls and shapes imparted to the rod by my improved method, No. 2 and No. 3 being equivalent views to each other, one showing a mill with the rolls all arranged parallel and the other with its rolls alternately horizontal and vertical. The rolls are shown drawn to a small scale, and the sections of the rod to a scale double the full size of an ordinary wire rod.

The sections marked C are shapes at the central portion of the rod, and those marked E are shapes near the end ofthe rod or of the finned portions. The numerals indicate the number or location of the pairs of rolls in the continuous-rolling mill and the corresponding section or shape imparted thereby to the rods.

The letter It denotes the rod-reducing rolls, and A denotes the auxilliary rolls or fin-repressing rolls.

It will be understood that the supportingframe and gearing for mounting and operating the rolls it and Acan be constructed and organized substantially in the ordinary manner, and are not therefore herein shown.

The series of reducing-rolls R are of the usual construction, each pair being made with grooves of smaller area and being operated at higher speed than the next preceding pair, so that the sectional area of the rod will be proportionally reduced by each pair of rolls R, as it passes through the machine to be delivered at the end of the series of the proper size required.

The auxiliary or tin-repressing rolls A are preferably introduced near the last end of the machine, or as final rolls, although said rolls can be used to follow any or all of the pairs of reducing-rolls, if desired. Said rolls A are made with grooves a of a s ze that will maintain the rod at practically the same sectional area as imparted by the preceding pair of rolls, while the speed of said rolls A is also ,the same as the speed of the preceding reducing-rolls B or with just sufficient excess of speed to avoid any sagging of the rod between the pairs of rolls. This excess of speed, if required, can be attained by a slight increase of diameter in the, rolls A over that of the rolls R, or by an extra tooth in their driving-gears. In the operation of the mill these rolls A act upon the fins or projections e, and press them down, but do not materially change the size or area of the body of the rod, which is reduced only by the rolls B in their regular order. By thus arranging the auxiliary rolls A, in combination with the ordinary reducing-rolls in a continuous-rollin g mill the fins e are repressed into the body of the rod as soon as formed, and no excess of metal is permitted to accumulate by the retarded action near the ends of the rod. Consequently the end portions of the finished rod are as perfectly formed as its central, and but little, if any, waste occurs in the subsequent use of the rods. Another advantage is that by avoiding the formation of fins it is practicable to roll the rods to a smaller size, and thus save time and labor heretofore required in the subsequent operations of reduction by cold-drawing through dies.

One, two, or more pairs of fin-repressing rolls A may be used in an ordinary-sized continuous-rolling mill. In the present instance I have shown two pairs as following the twelfth pair in a fourteen-reduction mill, and asingle pair, 14 A, following the final-reduction rolls 14 R. I do not, however, desire to confine myself to this particular location and arrangement, as said rolls A may be arranged auxiliary to any of the rolls R, as desired.

I am aware that mills for rolling metal rods by continuous process have heretofore been invented and described, as in the French patent to Levy, dated June 23, 1854, and in the English patent to Bedson, No. 1,935 of 1862, and in which a series of grooved rolls are arranged for successively reducing the size or sectional area of the rod as it passes through the machine; also, that such series of rolls have been arranged both with their several axes parallel to each other and with the axes .of alternate pairs of rolls at right angles to each other. Idonot therefore desire it to be understood that I herein make claim broadly to such features, or to the principle of the continuous rolling of metal rods, my invention being an improvement in this system of rolling, whereby certain defects hereiubefore mentioned are obviated, and which improvement is distinguished by the employment, in addition to the ordinarily-arranged reducing -'rolls heretofore used, of certain other rolls formed and speeded to substantially conform to the pair next preceding them, and introduced to act auxiliary thereto, or arranged in such manner that they exert no appreciable effect or reducing action on portions of the rods that have received normal reduction ,or are of proper form due to the respective position in the mill, but which auxiliary rolls are effective to act upon the finned or distorted portions of the rod, serving to correct distortions, to reduce the fins, and to maintain uniformity of size throughout the length ofthe rod, by subjecting it, or the distorted portions thereof, to a duplex or second rolling action without a material change in the size or sectional area of the body of 5 the rod as it passes said auxiliary rolls.

What I claim as of myinveution, and desire to secure by Letters Patent, is-- 1. The method of preventing the formation continuous-rolling mill, of one or more pairs of fin repressing rolls working auxiliary to said pair of reducing-rolls, and adapted for rolling down thefins without materially changing the sectional area or size of the body of the rod, substantially as hereinbefore set.

forth.

3. The combination, in a continuous-rolling mill for rolling metal bars or rods, of a series of rod-reducing rolls and a series of fin-repressing rolls, said fin-repressing rolls having grooves substantially of the same sectional area as their preceding pair of reducing-rolls and operating at a speed substantially corresponding therewith, as and for the purpose hereinbefore described.

Witness my hand this 10th day of August,

. FRED H. DANIELS. Witnesses:

OHAs. H. BURLElGH, S. R. BARTON.

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