US699131A - Method of hot-rolling metal sheets in packs. - Google Patents

Description

Nu.`699,|3|. lawmw` may s, |902.

T. V. ALLIS. METHD 0F HOTA ROLLING METAL SHEETS IIN PACKS. (Application med M531, V1901.)

(No Model., 2 SheeTs-Sheei l.

@VH1/momo No. 699,|3| Patented May 6, |902.

T. V. ALLIS. l

METHOD 0F HOT RULLING METAL SHEETS IN PACKS.

(Application med Aug. s1, 1901.)

2 Sheets-Shui 2,

UNITEDz STATES i PATENT FFICE.

THOMAS V. ALLIS, OF BRIDGEPORT, CONNECTICUT.

METHOD OF HOT-ROLLING METAL SHEETS IN PACKS.

SPECIFICATION forming part of Letters Patent No. 699,131, dated May 6, 1902.

Application filed August 31, 1901. Serial No. 74,024. (No model.)

To all whom, it may concern:

Be it known that I, THOMAS V. ALLIS, a citizen of the United States,residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented a certain new and useful Improvement in the Method of Hot- Rolling Metal Sheets in Packs, of which the following is a specification, reference being had therein to the accompanying drawings.

'lhis invention consists i-n an improved method of hot-rolling metal plates in packs of original construction to sheets of commercially-accurate gages in packs by first passing the packs through a series of pairs (two or more) of reducing-rolls arranged in tandem and adj usted to effect a progressive vreduction of the plates composing said packs, and, second, in passing said packs through a pair of auxiliary rolls located either adjacent to said series of sets of rolls or in tandem arrangement therewith a sufficient number of times to complete the reduction-gage or to correct any defective rolling by any pair of said series of rolls, all as hereinafter fully described and as set forth in the appended claims.

In the accompanying drawingslhave shown diagrammatically the essential parts of a machine necessary to a full understanding of the' invention and by which the methods claimed may be carried out in practice.

Figure 1 represents in plan the furnace and continuous train of reducing-rolls, together with the adjacent auxiliary rolls; and Fig. 2, a furnace and a less number of pairs of reducingrolls with the auxiliary rolls arranged relatively in tandem.

When metal is hot-rolled in packs,the thickness of the component sheets cannot be measured, and the only way to determine whether they have been reduced to the required gage is by the amount of elongation produced in rolling. To determine this, the elongated packs are measured after leaving any set of rolls in the train last passed through, which may constitute the finishing pair, and when a pack emerges therefrom andr is-found to be too short to produce' the required thickness' with the continuous operation of the continuous train. For this purpose these auxiliary rolls may be located to one side of the continuous train of rolls, as shown in Fig. 1 of the drawings. It is to be understood that in the operation of the continuous train of rolls that a pack is free from one pair of reducingrolls of the lseries before it enters another pair, and that the last pair of rolls in the tandem4 train may constitute the finishing pair, assho'wn, for example, in Fig. l.

In Fig. 2 of the drawings only two sets or pairs of rolls are shown as the continuous train of rolls, with the auxiliary rolls in tantem therewith, the pack being manipulated independently in the auxiliary rolls.

In the arrangement of rolls shown in Fig. l the operation is as follows: 1 represents an ordinary furnace having the throat 2, through which the metal passes to the first set of rolls 3, where the first reduction is made, thence to the second set of rolls 4, and so on progressively through all the sets of rolls 5, 6, 7, 8, and 9, if required, each set elongating the metal packs, and consequently reducing the thickness of each plate therein until the final Vitspassage through the train of rolls, (care being taken that none of the packs shall be 4too lon g,) it is then transferred to the auxiliary rolls 10, where it is rolled independently to theproper length, and consequently to the required thickness, of its component sheets and without interfering with the continuous output of the continuous train. The operative in charge of these auxiliary rolls, knowing the gage required, will adjust said rolls accordingly. Without these auxiliary rolls it will readily be seen that whenever a pack is found to be too short and the sheets composing the same consequently too thick the output of the continuous train would'y have' to cease, while the delivery or end pair of'rolls arefreadjusted and occupiedin completing this insufficiently-rolled pack; IItis thereforeapparent that with the use of the auxiliary rolls the output of said continuous mill is in no way interrupted, which means that the continuous train and the furnace are operated to their full maximum capacity. If so desired, the auxiliary rolls l0 may also be placed in the same axial line with the rolls 9, as shown in dotted lines, Fig. l, and coupled thereto to be driven from the same power that drives the continuous train.

In case a pack becomes in any way distorted while passing through a continuous rollingmill it would be impossible for it to proceed. With the present invention a damaged pack can at once be removed from the continuous train and corrected and finished in the auxiliary rolls.

In a continuous rolling-mill each pair of rolls in the train is set to bear a proportionate share of the total reduction. Therefore if a change is made in one set a corresponding change must necessarily be made in all. When, therefore, the rolls are all properly adjusted to turn out a certain finished product, it would not be economical to make a change to roll small orders of other gages. With the present invention packs may be taken from the train at any convenient point and finished in the auxiliary rolls without curtailing the output of the continuous mill, thus enhancing the value of a mill of this type for rolling assorted orders of sheets in packs of various sizes at a lower cost of production than hitherto accomplished.

1l, l2, I3, 14, l5, and 16 are guides located between the continuous train of rolls for transferring the packs in their passage to and through said train of rolls.

It is obvious that in the practice of this invention with a less number of pairs of reducing-rolls in the continuous train, as shown, for example, in Fig. 2, a partial reduction may be effected by passing the packs therethrough and then subjecting them to further reduction and finishing by the single pair of auxiliary rolls, the latter operation being performed by passing and repassing, usually by hand manipulation.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The herein-described continuous method of hot-rolling metal plates in packs to sheets of commercially-accurate gages, which consists in first partially reducing the original packs in a tandem mill, and second passing said packs directly from said mill through a single pair of auxiliary rolls a suliicient number of times to complete the reduction, as set forth.

2. The herein-described method of hot-rolling metal plates in packs to sheets of commercially-accurate gages, which consists in partially reducing the packs in a tandem mill, removing therefrom such packs as have been damaged or sufficiently rolled when intermediate of any two pairs of rolls in said mill, and passing the same through a single pair of auxiliary rolls a suicient number of times to complete the reduction whereby a finished product of any desired gage is produced without interfering with the continuous operation of the mill, as set forth.

3. The herein-described method of hot-rolling metal plates in packs to sheets of commercially-accurate gages, which consists in, first, effecting a partial reduction in a tandem mill, and, second, passing said packs through a single pair of auxiliary rolls a su lficient number of times to complete the reduction and at a single heat, as set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

THOMAS V. ALLIS.

Vitnesses:

CHAs. W. FORBES, CHARLES HANIMANN.

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