US1873710A - Roller bearing working roll chuck - Google Patents

Description

Aug. 23, 1932. E. B. HUDSON ROLLER BEARING WORKING ROLL CHUCK 2 Sheets-Sheet 1 Filed Aug. 2, 1928 6M1 all 1932- E. B. HUDSON ROLLER BEARING WORKING ROLL CHUCK Filed Aug. 2, 1928 2 Sheets-Sheet 2 \& a I

- INVENTOR.

BY 0 WW 1 am ATTORNEY.

,4, e11 thrust upon the working rolls;

this factor, as well as other types of thrust Patented Aug. 23, 1932 STATES PATENT may 'i'f Enwnv- B. rwnsomor BuTLnarEunsYLvA IA,Assumes-T THE AMERICANYROLL- I1\TG-1VIILL COMPANY, or mnnrnrowu, c1110, I CORPORATION or cure ROLLER. BEARING wonxiuc ROLL cHucK My invention relates to the provision of working roll bearings in what are known as four high mills. In these members the working rolls "are of'com'paratively small diameter 5 and'bear against-back up rolls of considerably larger diameter, the bearings of which sustain the greater part of the vertical load.

Itis old to apply roller bearings to the back up roll. There is-no particulardifliculty involved in doing this because bearings of sufficient size to sustain the 'verticaland horizontal thrusts may be applied. Hitherto however, "roller bearings or the like, have not been applied to the Working rolls;

' Prior practice has utilized brasses bearing against the rolls and held in place by wedges. This method of aligning is very unsatisfactory, since it gives no assurance c. that the rolls will be in alignment after setting} The brasses continually wear and they "require continual adjustment. Furthermore, the adjustment thereof must be accurate.

tically aligned, but the axis of their aligninent is oifset a certain distance, usually- A; of an inch, from the .axis of alignment of the backup rolls. There is there-fore a horizon- Due to and under the oldpractices, the working rolls-require continuous attention. 'Not only must the properoffset alignment be maintained but the axes of the rolls must not twist with respect to each other even when metalis being rolled between them; Again, it should be pointed out that the setting" of the brasses by means of the wedges is done more or'less in the blind, with definite fixed IE0 points to indicatethat proper alignment has been accomplished, but'with nothing to indicate thatthe fixed point-s themselves indicate the best alignment.

With the present practice, it is practical- 545 ly impossiblerto keep the brassesproperly lubricated because mill water is constantly washing the lubricant away. Lack of proper lubrication of course, results in the rapid Wear of the brasses', increases the necessity of continual attention to'alignment and inany special marks As will be understood by one skilled in the art, the working rolls are ver- Application filed August 2 1928. Seriallfo. 296,951.

volves costly replacementsalong with delays 'in production when the mills are closed down.

It is an'object of my invention to provide proper alignment of the rolls, in such a way that it will not be affected bywear occurring in brasses. I 7

Another object isto provide chucks whereby the working rolls may be aligned in prop"- er oflset' relation to the backing up rolls, qulckly and easily andwithout the'use of or the like toindicate alignment. j

A further object is to provide. a chuck by means of which the center line of the working rolls may be fixed with relation to a certain part of the mill, and will be unaffected in'that-fixed position by rapid wear of the parts. Still another object is torprovide a chuck wherein therolls can be mounted in an anti-frictional manner, and whereinthe bearing surfaces can be protected from the flow of mill water, whereby proper lubrica tion can be maintained at all times.

Still another object of niy invention is to provide" for the ready changing of rolls and 1 to eliminate the delays due to the old methods of alignment, these and other objects which will be apparent to one skilled in the art'who reads these specifications, I accomplish by that novel construction andarrangement of parts of which I shall now describe a preferredembodiment, reference being made to thedrawings which accompany these specifications and in which like parts are designated by the same reference characters. In the drawings: e Figure 1 is a part'side elevation'showing the chucks in place.- A part of this drawing is in section. I

' Figure 2 is a longitudinal section through one of my chucks showing the position of the Wedge, and the anti-frictional roller and ball bearings. This section is taken along the lines 22in Figure 1. V

Figure 3is a perspective view of the wedge used to keep the working rolls on a fixed center line. 7 1

I have shown in Figure 1 the main frames 1 Of afour high rolling mill,-up0n which frames are mounted the backing up rolls 2 and the working rolls 3. The working rolls 3 are mounted in chucks 4, in the construction of which my invention has its primary application. The back up rolls in these chucks are designed to be mountedin a fixedposition relative to a machined face 5 shown as lying on the right side of the main frame. Since my rolls are mounted in roller bearing chucks, if these chucks bear the proper relationship to the face 5, amounting of them in that relationship iswall that is necessary. And an operator is not required to'do' anything further to adjust the position of. the rolls either with reference to each other in vertical alignment or with reference to the backing rolls in proper offset relation therefrom.

The chucks are held against lateral movement with relation to the mainframes by means of the'adjustable clamps 6 which are bolted to the main frames by cap screws 7. The chucks in addition to being held against lateral movement by the clamps, rest upon projecting machined edges 8 which support them vertically and prevent'the chucks and working rolls from descending in the frames beyond a predetermined point. 'The machined face 9 of the chuck is held in contact with a machined face 10 on the main frame opposite the machined'face 5, by a wedge 11 to be described. Keeping the machine faces 5 and 10 in contact withthe chuck at all times, by means of the wedge, results in maintaining the chuck in a fixed position, though movable vertically in the main frame, and maintains the working rolls in proper relationship to each other and to the backing up rolls. The members fixing theposition of the rolls are bearing against stop surfaces which are not subject to excessive wearing conditions.

Since these surfaces are on both sides'of the mill, the aligned centers of the rolls must necessarily be fixed and maintained throughoutqtheir vertical movement, and'there can be no twist of the axis of one roll with respect to the axis of the other. The wedge 11 which is clearly shown in Figure 3 has a sloping side 12 which bears against a similarly developed surface 13 (Figure 2) in the chuck. When this is done, the straight side 14 on the wedge is parallel to the machined surface of the frame and is ready to accomplish the fixing of the roll centers.

Strips 15 may be interposed between the chuck and the main frame if desired.

The top of the wedge has a T slot 11a in which I insert the head of a bolt 16 which I use to adjust the wedge with reference to e chuck to come in contact and be held against the machined face 5 of the frame at the right side. The screw 16 passes through a boss 17 which is a part of the chuck, and carries a nut 18 on its outer end.

The neck of the roll 3 is mounted on roller bearings 21 within the chuck and these bearings carry the radial loads. Ball bearings 22 abut oppositely disposed shoulders on the chuck and on the sleeve surrounding the neck of the roll and their purpose is to carry the thrust loads. 7 The combination of roller and ball bearings produces a low friction bearing which is highly desirable and is adequate to sustain the, loads applied upon the rolls. "The roller bearings 21 operate ina raceway 25, and bear against the sleeve 23. Rings 26 and 27 serve to hold the raceway in place upon the sleeve. The ball bearings 22 have a holder 28 and it will be more clearly understood from Figure 2 how these balls take the end thrust; The same figure also shows very clearly how the entire bearing is housed and protected from mill water, It will be seen that-felt washers 29 close the opening between the sleeve and the housing and that felt washers 30 close the opening between the housing and the neck of the roll.

In order to adjust a working roll in position, I place the chuck between the main frames and hold it there against lateral. movement by means of the clamps. When the clamps are'fast in place, I tighten up on the nut 18 whereby the wedge is tightened up between the chuck and the frame. The chuck is caused to move to the right, until it comes into position against the machined face 5 and this face positively aligns the chuck. The roll mounted in fixed bearings within the chuck is of course aligned when the chuck is aligned; and it will be readily understood that the whole assembly is quickly put in place and very easily adjusted.

I have found it possible by the construction which I haveoutlined, to place upon the working rolls of four high mills roller and ball bearings of sufficient size to sustain the vertical and horizontal thrusts and the end thrusts even though the space is limited. This is facilitated because in four high mills, the greater part of the vertical thrust is borne by the bearings of the back up rolls, and as distinguished from three high mills, there is a back up roll for each working roll. The space for'workin roll bearings is limited; but by my construction I secure'a sufliciently strong and adequate bearing.

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

1. ,A chuck forthe working rolls of four high mills, said chuck comprising a machined face upon one side adaptedto bear against a machined face on the mill frame, means on the other side of said chuck, to cause said machined face to bear against the machined face on said frame by abutting an opposed frame member and a fixed anti-frictional bearing for the neck of a working roll, said bearing comprising a roller bearing to sustain radial thrusts and a ball bearing to sustain lateral thrust, said bearings comprising a sleeve to encircle the neck of a working roll, roller bearings between said sleeve and said chuck,

a shoulder on said sleeve, a shoulder borne by a said chuck, and ball bearings abutting both shoulders to sustain end thrust.

2. A chuck for the'working rolls of four high mills, said chuck comprising a machined face upon one'side adapted to bear against a machined face on the mill frame, means on the other side of said chuck to cause said machined face to bear against the machined face on said frame by abutting an opposed frame member and a fixed anti-frictional bearing for the neck of a working roll, said bearing comprising a roller bearing to sustain radial thrusts and a'ball bearing to sustain lateral thrust, said bearing comprising a sleeve to encircle the neck of said Working roll, roller bearings between said sleeve and said chuck, ball bearings between said sleeve and said chuck, closure members for making a lubrication tight joint between said sleeve and said chuck and between said chuck and said roll neck and means for introducing lubricant into the interior of said bearing. 3. A chuck for the working rolls of four high rolling mills, said chuck containing a fixed anti-frictional bearing comprising a sleeve to encircle the neck of a roll, a shoulder on said sleeve forming a raceway for ball bearings, a surface on said sleeve forming a raceway for roller bearings, a housing, for roller bearings bearing against said chuck, a member having a shoulder forming a raceway for ball bearings also bearing against said chuck and roller bearings and ball bearings in said respective raceways, the whole being closed by said chuck against entrance into the bearing of mill water, and means to introduce lubricant into said bearing.

4. In a four high rolling mill comprising working rolls and back up rolls, bearing members for the back up rolls, and a frame with members at opposite sides of the roll-s, chucks for the working rolls, anti-frictional nonadjustable bearings in said chucks for said working rolls, and means at the adjacent ends of the respective chucks, acting against one frame member to force said chucks against the opposite frame member, the surfaces of contact of said back up roll bearing members and of said chucks with said opposite frame member being substantially at right angles to the direction of forcing of said chucks, whereby all of said rolls are held in correct positions relative to each other by said opposite frame member.

EDWIN B. HUDSON.

Images