US1373950A - Rolls for hot-rolling sheet metal - Google Patents

Description

T. H. COLLEY.

ROLLS FOR HOT ROLLING SHEET METAL. APPLICATION FILED APR.26. 1920.

11,373,950. atented Apr. 5, 1921.

mrsn s'rArl-zs THOMAS E- COLLEY, 0E BLASDELL, NEW YORK,

ROLLS FOR HOT-ROLLING SHEET METAL.

Specification of Letters Patent.

Patented Apr. 5, 1921.

Application filed. April 26, 1920. Serial No. 376,510.

T 0 all whom it may concem:

Be it known that I, THOMAS R. CoLLnY, a citizen of the United States, residing at Blasdell, in the county of Erie and State of New ,York, have invented a new and useful Improvement in Rolls for Hot-Rolling Sheet Metal, of which the following is a specification.

This invention relates to rolls of the kind used for hot rolling metal sheets. i

In hot rolling steel sheets of the kind used for automobiles or for other purposes which require sheets having specially smooth surfaces, rolling mill operators have always experienced considerable difliculty inkeeping the surface of the rolls smooth and free from marks or indentations made by scale or other substances between the rolls. The rolls commonly used have substant ally cylindrical faces and the marks or indentations on the rolls are generally made when parts of these faces of the rolls come together with considerable force after the end a bar or the like'passes out of the rolls. Then if any, scale is on the rolls along the line of contact, this scale will be driven into the surface of the rolls and will form depressions or indentations on the surface of the rolls which will produce uneven surfaces on the sheets passing between the rolls.

The objects of this invention are to provide means for preventing the marking, 1ndenting or otherwise injuring of the rolls for hot rolling metal sheets when the surfaces thereof contact; also to provide means of this kind which are so arranged as not to interfere with the usual operation of truing the rolls by placing the cylindrical surfaces of the two rolls incontact with each other; also to improve the construction of rolls of this kind in other respects hereinafter specified.

In the accompanying drawings:

Figure 1 is an elevation of a pair of rolls embodying the invention showlng the same in operative position for rolling metal sheets, and showing in section parts of the frame 1n which the rolls are mounted.

Fig. 2 is an elevation thereof showing the rolls in position for truing or matching the surfaces thereof. a

A represents the upper roll and B represents the lower roll. These rolls have the usual reduced bearing portions a and b and the cylindrical faces a and 1) between which the metal sheets'are rolled. The rolls are mounted in a frame including two side members C, each having a bearing or guide slot 0 therein. The lower roll, in the constructlon shown, is journaled in fixed bearings 0' 1n the lower ends of the slots 0 and the upper roll is movable vertically in the slots 0, this roll being pressed downwardly by means of the usual screws 0 which bear against riders c pressing against the bearing portions a of the upper roll. .When the work which is being rolled is comparatively thick, the screws are adjusted to permit the rolls to separate as may be desired. In rolls as usually, constructed the cylindrical surfaces thereof are unbroken to the edges thereof and when the rolls are not separated by the;

material which is being. rolled, the cylin drical surfaces of the rolls are in contact. Hence in rolling a bar or a thick plate or number of plates the rolls will come together with considerable force when the end of the bar passes out of the rolls, and if any scale should be between the rolls at that time, a

mark or depression will be made on the rolls.

In order to overcome this damaging of the rolls, means are provided at the opposite end portions of the rolls for holding the cylindrical portions of the rolls out of contact. In the construction shown in the drawings for this purpose, the rolls are provided with collars .or annular enlarged portions which f are preferably formed integral with the rolls and which serve to keep the cylindrical surfaces of the rolls out of contact and thus prevent injury to the rolls when the end of a bar or pack of sheets leaves the rolls.

These collars are only of slightly greater diameter than the cylindrical surfaces thereof, it having been found that collars which extend from fifteen to forty-five thousandths of an inch beyond the cylindrical surfaces answer the purpose. The collars are arranged at the outer ends of the rolls so as not to contact with the metal which is being rolled nor in any way to interfere vvithiv the rolling of the metal in the usual mariner. These collars may be arranged in any desired manner on the two rolls or on one roll only. The construction shown in the drawings, however, discloses an arrangement of the collars or enlarged portions which I consider preferable, the drawings showing collars D and E, the height of which above the cylindrical surface of the rolls being somewhat exaggerated in the drawings to show the invention more clearly, the collar D beranged at a slight duced by the rolls and the ing' arranged at one end of the upper roll and the collar E being arranged at the opposite end of the lower roll. Fig. 1 shows the rolls in operative relation to each other for rolling sheets from bars. These collars do not in any way interfere with the usual function of the rolls, since rolls are generally made considerably wider than the widest sheets for which they are intended to be used, so that the provision of collars on-the ends of the rolls does not add to the cost of the same nor does it detract from their range of use."

In the turning of rolls, one or both of the rolls are generally cut slightly concave, since in the use of the rolls the hot metal which is being rolled heats the middle portion of the rolls to a greater temperature than the end 7 portions." Consequently the middle portion expands to a greater extent than the'end portions, for which reason the rolls when cold are made slightly concave, so that they will be cylindrical when hot. In order to turn the rolls accurately so that the rolls of each pair will cooperate correctly with each other, the rolls are matched, or finished in pairs with their cylindrical surfaces'in contact. In order to give one of the rolls the desired concavity the axis of one roll is arangle to the vertical plane of the axis of the other roll and the surfaces of'the rolls are then finished so that they contact throughout their lengths at all times during the revolutions of the two rolls. It will be seen that owing to the arrangement of the collars shown in the drawings it is still possible to place the cylindrical surfaces of the rolls into contact for the pur pose of matching the rolls, and Fig. 2 shows how this can be done, namely by shifting one of the rolls endwise so that each of the collars extends beyond the adjacent end of the opposite roll.

y means of the construction shown and described, the possibility of injuring, of the cylindrical surfaces of the rolls is greatly reduced so that more accurate work is prorolls can be used for a considerably longer period of time before a refinishing of the cylindrical surfaces becomes necessary. The cylindrical surfaces of rolls as heretofore made also became slightly crystallized by the force of i the blows caused by the two rolls coming into contact, and these crystallized portions of the rolls interfere with the finishing or resurfacing of the rolls. By providing the rolls with collars. the blows are received by the collars and the cylindrical surfaces of the rolls are not crystallized and therefore preserve a uniform hardness which facilitates the refinishing of the rolls. The arrangement of the collars shown also makes it possible to match or fimsh the cylindrical faces of the rolls in the usual manner.

The collars have a further advantage in greater diameter than that they hold the cylindrical faces slightly '7 apart .and thus enable the metal to be rolled to pass more readily between the rolls. In other words by slightly separating the cylindrical surfaces of the rolls, the rolls more readily grip the front edge of the metal I claim as my invention:

1. A pair of rolls for use in hot rolling metal sheets and having substantially cylindrical surfaces adapted to engage the metal to be rolled, said rolls being movable toward and from each other, and means arranged at the ends of said rolls which prevent the faces of said rolls from contacting when no metal is being rolled, said means being located beyond those portions of the rolls which are intended to contact with the metal rolled by said rolls, whereby the marking of the cylindrical surfaces of the rolls by scale is prevented. f

' 2. The combination of a pair of rolls for use in hot rolling metal sheets, one of said rolls being movable toward and from the other roll in a direction right angles to its axis, said rolls having substantially cylindrical -surfaces adapte;d to engage the metal to be rolled, and enlarged portions on the ends of said rolls which hold the intermediate portions of the rolls apart when no metal is between the rolls, said enlarged portions being located beyond those portions of the rolls which contact with the metal being rolled.

3. The combination of a pair of rolls for use in hot rolling metal sheets, one of said rolls being movable toward and from the other roll in a direction substantially at right angles to its axis, said rolls having substantially cylindrical surfaces adapted to engage the metal to be rolled, and enlarged portions on the ends of said rolls, said enlarged portions being of only slightly said cylindrical surfaces of said rolls and being out of contact with the opposite rolls and with the metal when the metal being rolled is between the rolls and holding the cylindrical surfaces of the rolls out. of contact no metal is between the rolls.

4. The combination of a pair of rolls for use in hot rolling metal sheets, one of said rolls being movable toward and from the other roll in a direction substantially at right angles to its axis, said rolls having substantially'cylindrical surfaces adapted to engage the metal to-be rolled, and an enlarged portion on one end of the cylindrical surface of each roll which extends slightly beyond the periphery of the rolls, said parts beipg arranged at opposite ends of the two ro s. a

5. A pair of rolls for use in hot rolling metal sheets and having substantially cylindrical surfaces adapted substantially at with each other when w housings and Wing movable toward and from each other, and an enlarged portion formed on one end of each roll, the two enlarged portions being arranged at opposite ends of the rolls, whereby the cylindrical surfaces of the rolls are out of contact when the rolls are in operative positions, and whereby said cylindrical surfaces may be brought into contact by moving one of said rolls endwise with regard to the other roll 10 when said rolls are removed from their housln 's.

llvitness my hand this 22 day of April,

THOMAS R. COLLEY. Witnesses M. J. PITMAN, F. E. PRooHNow.

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