US1259969A - Roll for rolling-mills. - Google Patents

Description

V. E. EDWARDS.

ROLL FUR ROLLING MILLS.

APPLICATION mso Nov.21.|9|4.

1,259,969. Patented Mar. 19,1918.

t i I z l L i L I UNITED STATES PATENT OFFICE.

VICITOB E. EDWARDS, OF WORCESTER, MASSACHUSETTS, ASSIGNOR T0 MORGAN CCNSTBUCTION COMPANY, 0F WOBCSTER, MASSACHUSETTS, A CORPORA- Tron or lussacnusnrrs.

ROLL F03 ROLLING-MILLS.

Specication of Letters Patent.

PatenteiLMar. 19, 1918.

Application med November a?, i914. serial Nu. 574,126.

To all 'whom 'it may concern.'

Be it known that I, Vieron E. Enwans, a citizen of the United States, residing at Worcester, in the count of Worcester and Commonwealth ofMas achusetts, have invented a new and useful Improvement in Rolls for Rolling-Mills, of which the following, taken in connection with the accompanying drawings, is a, specification.

T e present invention relates to the oonstruction of rolls and roll housings for rollin mills and the like, and has particular re erence to the formation of the necks, or bearing portions of such rolls, and the manner of disposing the same within their supporting bearings carried by the roll hous 1n A11 object of the invention is to provide a construction adapted to oifer an increased area of 'bearing for the end thrust of the rolls, over any construction previously used; a further object is to attain greater space for the introduction of lubricant to the bearing surfaces of said rolls, and a still x further object is to decrease thecylindricxll area of such bearing surfaces to a. minimum without affecting the strength and rigidity of the roll supporting means, thereby decreasing this1 friction produced in the operation of the ro s.

In the accompanying drawings,

Figure 1 is an end elevation of a structure embodyingmy invention,

Fig. 2 is a side elevat'on of the same, one

of the housings for the rolls being shown in section on the line 2-2 Fig. 1.

Fig. 3 is an enlarged view of one end of a roll illustrating, diagrammatieally, the manne of arriving at the proper propor tions for the neck ofthe same, in accordance with the present invention.

Similar reference characters refer to similar parts in the different figures.

Practice has demonstrated that the severe demands of service, especially in rolling wide thin flats, require, at the innermost points of support for each roll, a neck diameter closely a preaching the actual working diameter o the roll, by reason o`f the strain, namely combined torsional and `)endiing. to which the roll, between its supporting Tirfaces, is subjected. As a consequence. the

shoulder aforded by the difference in the diameters of the roll and its neck, to resist the end thrust of the roll, is a relatively small one, and furthermore, its effectiveness,

as the surface of. the roll wears, and isA turned down to compensate for such wear, is correspondingly diminished. In addition., the opposing surfaces of the roll hearing4 section' and thc roll, which constitute the above described 'thrust hearing, are subject at all times to the action of water and scale, rendering the satisfactory lubrication of said end thrust bearing practically impresible. The present invention f.:ontemplate: in amelioration of the disadvantages above set forth, by the use of rolls having necks of special and particular formation, as fully set forth hereinafter.

fReferring to Figs. 1 and 2, I have illustrated a stand of rolls which, in its general characteristics, .is of an approved. and regularly adopted construction, the same com` prising a pair of housings l and adapted to support between them a pair 0f rolls 3 and 4. Each housing is in the form sub` lstantially of a rectangular frame, having {upright- Sides 5, connected by a hase 6 and a top or crown 7. The supporting means for the lower roll 3 contemplates a bearing section 8 having lateral cars or flanges 9, 9 which embrace the sides 5, 5 of the housing, to prevent axial displacement o1' the said bearing section, and also serve to guide said bearing section in its vertical movement by the usual adjusting wedge 10, interposed between the same and the base 6 of the hous ing. A right and left hand screw 11 provides for the simultaneous movementof the two wedges 10 to raise or lower said bearing sections and with them the roll 3. The supporting means for the upper rali l is found in a bearing section 12 provided in each housing and resting normally, at the lowest disposition of said roll, upon shoulders 13, 13 extending inwardly from the sides 5. 5. An upper bearing block 14 foi' the roll 4 is also carried by each housing, the same having guide cars or flanges 15, l5, embracing the SidesA 5. 5 in the same manner do the ears 9 of the bearing blocks 8 for the lower roll 3. Bolts 16 passing through the ears 9 and lpof the blocks 8 and 14 respectively,

coperate with the sides 5, yof the housings to retain said blocks in any given vertical Screws 17 carried position of adjustment.

housing are ncapable by the crown 7 of each of turning therein to provide an adjustable abutment for the upper bearing blocks 14: of the roll 4, whereby the :pward deiection of said roll, due to` the passage oi the Work between the rolls, is limited and controlled. Each roll 3, 4 presents a shoulder 18 in opposition to the inner ends of its bearing sections 8 and 14 respectively, the extent o said shoulder being determined by the difference between the radius of the roll proper, and the required radius of the roll neck or bearing portion, at lthis point.

The determination of a minimum neck diameter for this point resolves itself into the calculation of a cross-sectional area suflieient to furnish the desired resistance to the combined bending and torsional strains, as previously set forth.

In Fig. 3 I have shown one end of a roll of a given diameter having a neck of predetermined length, the broken line at the left hand end of said figure passing through the longitudinal center of 'the roll. In said figure, Afi represents the line of equal bending strength for the roll and neck, indicating at any given transverse section, the dif an'ieter required to resist bending strains.

The uniform section indicated by ltheline usual manner.

resents the section of uniform strength atf B--B on said figure represents the diameter required to resist the torsionstrains incident to the rotation of the roll by the application ol' power through the neck, in the The line C-C, Fig. 3, repall points to' resist bending and vtorsional .strains combined. The usual practice heretofore has been to compromise strength` in order to get ade uate end collars for the roll, the roll neck being turned to a uniform diameter outwardly from the shoulder 18, as indicated approximately by the broken line D-IL Fig. 3, the concave surfaces of the several bearing sections 8, l2 and 14 being correspondingly turned to accommodate roll necks havin surfaces. I owever, as seen in Fig. 3, the line C-C, representing at successive axial points, the resultante of the corresponding diameters indicated by the lines A-A and B--l-B, assumes a gradually convergent direction from theshoulder 18 toward the outer end of thc roll neck, and the present invention aims to utilize this characteristic in overcoming the previously mentioned disadvantages conimon to rolls having their necks formed in accordance with present practices.

It is proposed to obtain additional strength over that afforded in present practice. by increasing the diameter of the neck in the vicinity of the shoulder 1B, nearest continuous cylindrical bearingthe roll proper, and at the same time-toobtain' more end collar by reducing the ortion of the neck which is remote from t e roll.

In carrying my invention vinto effect, tlie section of the roll neck at the shoulder 18 is made to correspond ap rox'imately to the section at this point in icated by the line C--O, Fig. 3, the diameter of the same represented by the dimension -ab--, ein

greater than the diameter given topa, ro

neck constructed according to existin practices. The roll neck portion thus ormed, havin the diameter -ab-, is extended some istance outwardly from 18, and it is terminated at a point in the given length of the neck, Where thereA is offered a suliicient dilerence between the diameter -al and the diameter indicated the shoulder by the line G---C, for the formation of a secdisturbed by any lweer upon the surface of this" collaris the rolls, and furthermore, more easily protected from scale andriwater and hence is better lubricated. In addition, the introduction-of the heavy grease used as a lubricant for the roll necks is'rendered easier, by reason of the increase Vin y the height of the space 21 between theblock 12 and the neck of rolll 3, due to the freduetion in the size of said neck.l The bearing surfaces of the necks being materially decreased, and the lubrication of the same being more perfectly maintained than `in rollsy of the usual construction, it follows that less power 'is required to drive said' rolls than heretofore. There is .less breakage 'of rolls and less necessity for renewals of bearings, both of which are now serious 'items 0f expense in operating mills.

I claim,

1. In a rolling mill a roll having alxienck affording a journal ment, said neck bein constituted b. .a portion adjacent the rol of smaller' iameter than said roll, and by anotiie portion of for its 'rotative 'movesmaller diameter than said first portion, ithe Y wardly of seid roll, the outermost section having a. smaller diameter than that required for a neck of uniform diameter, which would resist the torsional and bending strains on said rolL 3. In a rolling mill,a roll having a neck affording a journal for its rotative movement` said neck being constituted b a portion adjacent the roll of smaller iameter than the roll, whereby to form a shoulder, and :i second portion of smaller diameter than said first portion, whereby to form a shouider between said first and second pori tions, the two shoulders affording a greater area to resist end thrust than would be afforded by a neck of the required uniform diameter to resist the torsional and bending strains on said roll.

4. In a rolling mill, a roll having a. neck affording :i journal for its rotative movenient, said neck being constituted by cylindrical portions of successively decreasing diameters outwardly from said roll, whereby to approximate in cylindrical form the minimum section of uniform strength which is adaptedto resist combined torsional and bendino` strains. l

5. A roll for rolling mills having a. neck portion constituted Vby cylindrical sections of successively decreasing diameters outwardly of said roll, the innermost section having a larger diameter than that required for a neck of uniform diameter which would resist the torsional and bending strains on said roll.

6, A roll for rolling mills having a neck portion constituted by cylindrical sections of successively decreasing diameters outwardly of said roll, the outermost section having a smaller, and the innermost section a larger diameter, than that re uired for a neck of uniform diameter whic would .resist the torsional and bending strains on said roll.

Dated this twenty-tirst day of November 5

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