US1861525A - Art of rolling metal - Google Patents

Description

June '3, 1932. v. E EDWARDS ART OF ROLLING METAL Filed July 22, 1929 5 Q Ma 9 w n n E e. 1 R u wfi nw .a mi. .9

Patented June. 7, 1932 unnsra'r vrc'r'on 'n. nnwanns,

03 WEST BOYLSTON, MASSACHUSETTS,

xenon r nonenn MASSACHUSETW Application filed July 22;

The present invention relates to a metal rolling method and apparatus, wherein provision is made for axially twisting or turning the stock, on itsdelivery from each reducing pass, so as to enter the next reducing pass in stock? have only a a difierent angular position.

In continuous rolling, especially, this twisting or turning of the stock, between successive reducing passes, is availed of, to promote the removal of scale, and to sub ect clifierent surfaces of the stock to direct rolling pressures. Heretofore, such twisting usually as been accomplished by a tube or guide, with interior surfaces conforming substantially to the stock section, but so deflected, longitudinally, as to gradually twist or turn the section through forty-five degrees or ninety degrees, or any angledesired, before it reaches the next pass. M p

The use of such twist guides, however is attended with certain disadvantages. 'ihe scale which tends to collect in said guides is a source of constant trouble, since it not only impedes the passage of the stock through the do, with a consequent increase in the power required for vthe rollin operation, but it produces scratching and roughness on the surface ofthe stock which can never be entirely removed, no matter how many subsequent finishing passes are employed. Moreover, such twist guides, because of the severe punishment imposed on them by the forcible contact of the rapidly moving hot brief life; under ordinary conditions, there is frequent necessity for their replacement.

Another expedient for the production of twist is the formation of the pass-forming grooves in reducing rolls of tapering or conical form, as shown by Re'ese,-' No. 275,856, April 17 1883; because ofsuchtaper, the asses present sides of unequal height, wherey, in consequence of the unequal draft thus produced on the sides of the metal undergoing reduction, the latter has a 'tendenc to twist. The use, however, of tapering re ucing rolls is attended with many disadvanrages, such as the greater initial cost of sald rolls and the difiiculty of c0rrectly'resurfao ing the same when undue wear has developed.

ART 0F ROLLING METAL 192a. Serial in.- estate.

Still another expedient for the productionof twist is the proposal to provide a substantially symmetrical pass in canted relation to the axes of the reducing rolls, as shown in the Miller Patent No. 1,749,671, March 4, 1930; this, however, requires a very complicated and expensive construction of the reducing rolls in the vicinity of their meeting surfaces adjacent the pass.

My invention contemplates the production of the desired twist in the stock undergoing reduction, in the absence of all the disadvantages attendant upon the use of twist guides or of the two expedients above referred to. Accordi'ngto my invention, ordinary cylindrical reducing rolls are empldyed, but the pass-forming grooves thereof have their centers of pressure slightly oflset,.so that the stock emerges with a non-setrical section. This serves to impart the desired twisting tendencies to the stock, so that, even though the, usual twist guides be used, in a supplementary manner, their work is diminished to such an extent that wear becomes a negligible factor, in consequence of which the usual life of such a guide is many times multiplied. Other and further objects and advantages of the invention will be apparent from the following detailed description thereof, taken in connection with the accompanying drawing, in which- Fig. 1 isa diagrammatic view in side elevation, partly in section, illustrating successive'stands of reducing rolls arranged to twist the stock in accordance with my invention Figs 2, 3, 4 and 5 are fragmentary schematic sectional. views, on the lines 2- -2, 3-3, 4r-4: and 5-5, respectively, of Fig. 1, and illustrating on a largerscale the. reducing passes of the roll stands of Fig. 1.

Like refererice characters refer to like parts in the diflerent figures.

To illustrate my invention, the stock in process of reduction, tor example, in the successive stands of reducing rolls 1, 1', 2, 2, 3, 3' and 4, 4. Let it be assumed that the stock, upon presentation to the pass 5 of rolls 1,-1?, is of substantially square cross section, as shown at I have shown til! "said pass 5, here shown by way ct example -of the stock into the merely, as a diamond form of pass, is so arranged, according to my invention, that the stock before entering the next pass 6, provided by the rolls 2, 2', will have been twisted or turned axially through a predetermined angle, for example ninety degrees,-such that the major axis of the diamond section will be substantially 6 ;-the latter, for example, being shown as a substantially square or Gothic form of pass. Heretofore, this twisting or turning of the stock, as indicated at B,'Fig. 1, has ordinarily been performed through the agency of a twist guide, disposed between the rolls 1, 1 and 2, 2.

By my invention, this twisting can be obtained in the reducing pass itself. As shown, the pass 5, instead of being a truly symmetrical diamond pass, has its centers of pressures c and 0' in the u per and lower rolls 1 and 1 respectively, 0 set substantially one from the other. This offsetting of the centers of pressure produces a twisting moment on the stock emerging from the pass 5, which, in the example here assumed, tends to throw the major axis of the section toward a vertical position. The effect of such twisting moment is cumulative; that is to say, any section of the stock acquires more and more twist, as its distance from the pass increases. Therefore, the amount by which the centers of pressure a and 0' are offset is so adjusted, according to my invention, as to produce in the distancebetween passes 5 and 6 a twist of the desired amplitude (in this case ninety degrees) bythe time the stock reaches the pass 6.

In this pass 6, the centers of pressure (1 and d are similarly ofiset, whereby to produce the necessary twist B, prior to the passage next pass 7. Preferably, however, this twist is in the opposite direction from the twist imparted in the preceding pass 5, a result obtained by offsetting the pressure centers d and d in a relation opposite to that of the pressure centers 0 and 0'. In the pass 7, here shown for exam le, as a substantially oval pass, a similar oset of the pressure centers e and e is availed of, to produce the necessary twist B, prior to the passage of the stock into the next pass 8. From the latter, if it be the size and section I desired to be rolled, the stock emerges without twist, because the centers and f, instead of being ofiset, in exact vertical alinement.

' I claim,

1. A pair of cylindrical reducing rolls presenting cooperating pass-forming grooves which have their centers of pressure offset, and which meet on opposite sides at the tangent plane of the r0 faces.

2. A pair of cylindricalreducing rolls presenting cooperating angular pass-forming of pressure f are, as shown,

vertical, as it goes into pass cylindrical surgrooves, therespective sides of which meet each other at the tangent plane of the rolls cylindrical surfaces, the bottoms of said grooves being laterally offset from each other.

3. In the twisting of rolled material in the process of reducing the same by successive passes through cylindrical rolls, the improvement which consists in offsetting the centers of pressure of the cooperating pass-grooves of said rolls while maintaining the terminal edges of said grooves at the tangent plane of the rolls cylindrical surfaces.

4. The improvement in rolling which consists in subjection of the stock tosuccessive reducing passes which twist said stock first inone direction and then in the other direction.

his VICTOR E. (X? EDWARDS.

Images