US1953146A - Dressing roll - Google Patents

Description

April 3, 1934. H H W 1,953,146

DRESS ING ROLL Filed Feb. 27, 1953 Patented Apr. 3, I934 PATENT orries 7 DRESSING ROLL Henry H. Wood, Canton, Ohio, assignor to The Timken Roller Bearing Company, Canton, Ohio, a corporation of Ohio Application February 27, 1933, Serial No. 658,788

3 Claims.

U My invention relates to the dressing and redressing of necked rolls that are mounted in taper roller bearings, especially rolls of the kind used in metal rolling mills and in paper and rubber making machines. It is very important that the surface of such a roll shall be exactly concentric with the axis of rotation thereof; and heretofore it has been quite difiicult and expensive to redress such a roll and preserve the necessary concentricity of its surface with its axis of rotation. Heretofore it has been the practice to entirely dismount such roll, free it from its bearings, mount its necks on the centers of the dressing machine, dress or grind the necks, then mount the necks in plain or sleeve bearings mounted on the bed plate of the dressing machine so that the roll centers are in line with the centers of the machine, connect the wabbler on one roll neck with the headstock and grind the roll body. In order to insure accurate finishing by this process, it is necessary that the roll centers be accurate, that the necks be dressed or ground to the same diameter and that the plain bearings fit accurately on the roll necks. In the event of uneven or very great wear of the roll necks, the use of specially bored plain bearings becomes necessary. The object of the present invention is to obviate these and other difiiculties incident to this old process, to eliminate the necessity of removing the bearings during the roll dressing operation and to improve the finish and concentricity of the roll. The invention consists principally in dressing and redressing the roll While it is mounted in its taper roller bearings which are first tightened up to accurately center the roll and eliminate all looseness and play thereof during the operation of dressing.

In the accompanying drawing, wherein like reference characters indicate like parts wherever they occur,

Fig. 1 is a longitudinal sectional View of a roll neck bearing arrangement typical of those adapted for the practice of my invention,

Fig. 2 is an end elevation, with portions broken away to show the construction more clearly,

Fig. 3 is an elevation of a roll mounted in a dressing machine,

Fig. 4 is an end elevation of the roll in said machine, the holding means for one end of the roll being omitted, and

Fig. 5 is a detail view showing a common type of adjustment shim for such a construction.

In the typical bearing arrangement illustrated in the drawing, the roll 1 has reduced neck portions 2 on which are mounted taper roller bearings B, said bearings being received in housings 3. The construction illustrated includes an abutment ring mounted against a shoulder 5 at the inner end of each neck 2, a double cone 6 W or inner bearing member mounted against said ring 4, a second double cone '7 disposed outwardly of said first cone and separated therefrom by a spacer ring 8, both cones 6 and 7 preferably having a tight press or shrink fit on said neck, annular series of conical rollers 9 on the two raceways of each bearing cone, a single cup 10 or outer bearing member for the innermost series of rollers mounted against a shoulder 11 in said housing, a double cup 12 or outer bearing member for the two middle series of rollers 9 and a single cup 13 or outer bearing member for the outermost series of rollers 9. An end closure ring 14 secured to the housing 3 as by bolts 15 has an inwardly projecting flange 16 abutting against the outermost bearing cup 13. Interposed between the end of the housing and said end closure ring 14 is a two part spacer ring 17 having slots 18 around its inner periphery to fit over the securing bolts 15. The adjustment of the bearings is accomplished by using spacer rings 1'7 of different thicknesses. The projecting end portions 19 of the roll neck are formed for 00- operation with suitable drive means.

When it is desired to redress a roll, it is removed from the frame of the mill or machine, along with its taper roller bearings, and together they are transferred to the dressing machine. In service, it is the practice to so adjust taper roller bearings as to afford slight play or looseness in order to make the bearings run more easily and avoid heating. Such slight play is permissible in service because the sheet material passing between the rolls exerts a constant outward pressure or reaction against the rolls which pressure causes the pair of rolls to maintain a uniform spacing between them. On the other hand, such play is not permissible when the roll is in the dressing machine without the radial outward pressure arising from. the reaction of the sheet. Accordingly, the taper roller bearings are tightened up before the roll is dressed; that is, the inner and outer raceway members are moved longitudinally towards each other to completely take up the looseness of the intervening rollers relative to said raceways. While this tightening adjust-ment is effected by relative longitudinal movement of the inner and outer raceways, it not only has the effect of holding the rollers against play endwise' but it also accurately centers all parts of the bearing relative to one another and holds them firmly against radial displacement. While the roll and its bearings are thus assembled, its bearings are mounted in any suitable dressing machine, such, for instance, as an ordinary grinding machine, and ground or dressed in the usual way.

It is noted that, by reason of the tight adjustment of its taper roller bearings, the roll is precisely centered on the axis of the bearing and maintains this position throughout the dressing operation; and therefore the surface of the dressed roll has precise concentricity with the axis on which it rotates in service.

The housing 3 illustrated is of rectangular section and the bottom of each housing may rest on a suitable work support 20 on the dressing machine. By means of plates 21 extending over the top of each housing 3 and bolts 22 having their lower ends fitted in T-slots 23 in the work support 20, the roll may be firmly held in proper position on the work supports, centered in the grinding or dressing machine. One end 19 of the roll may be connected by means of a suitable coupling 24, indicated diagrammatically, with the head or drive portion 25 of the grinding machine.

Obviously, numerous changes may be made in the construction of the dressing or grinding machine and the bearing supporting means without departing from my invention; and the bearing arrangement shown is only illustrative; and I do not wish to be limited to the precise construction shown.

What I claim is:

1. The process of dressing rolls that are equipped with taper roller bearings, which comprises tightening the adjustment of its bearings in their housings, mounting said housings in holding devices of a dressing machine and then dressing the surface of the roll mounted in such tightly adjusted bearings.

2. The process of dressing rolls that are equipped with taper roller bearings which comprises tightening the adjustment of its bearings in situ, removing the roll from its mounting without disturbing the adjustment of said bearings, mounting said bearings in holding devices of a dressing machine and then dressing the surface of the roll mounted in such tightly adjusted bearmgs.

3. The process of dressing rolls that are equipped with taper roller bearings which com: prises tightening the adjustment of its bearings in their housings, removing the roll from its mounting without disturbing the adjustment of said bearings, mounting said housings in holding devices of a dressing machine and then dressing the surface of the roll mounted in such tightly adjusted bearings.

HENRY H. WOOD.

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