US3896594A - Roll grinding device including chock positioning means - Google Patents

Abstract

A roll grinding device for a roll supported by chocks, comprising a plurality of vertically movable pins for supporting the chocks, each pin having a slope at its lower end, and a plurality of horizontally movable wedge members, each having a slope at its upper end adapted to be mated with the slope of a pin, for controlling the vertical positions of the pins. An assembly is provided for moving the wedge members horizontally, and the moving force is limited to a value less than that which can lift the total weight of the roll and the chocks at the supporting pins. An assembly is also provided for engaging the peripheral face of the roll near the chocks and for moving the roll from a non-grinding to a fixed grinding position in the chocks.

Description

lj'nited States Patent Sakai ROLL GRINDING DEVICE INCLUDING CHOCK POSITIONING MEANS Related U.S. Application Data Continuation-in-part of Ser. No. 202,770, Nov. 29, 1971, abandoned.

Inventor:

Assignee:

U.S. Cl 51/236; 51/254 Int. Cl B24b 41/06 Field of Search 51/49, 103 R, 103 C, 236,

References Cited UNITED STATES PATENTS 2/1946 Case 51/49 11/1954 Mader 51/238 S X 5/1963 Hold 51/49 X [451 July 29, 1975 3,691,701 9/1972 Clark 51/238 S Primary ExaminerAl Lawrence Smith Assistant Examiner-Nicholas I. Godici Attorney, Agent, or FirmSughrue, Rothwell, Mion, Zinn & Macpeak [57] ABSTRACT A roll grinding device for a roll supported by chocks, comprising a plurality of vertically movable pins for supporting the chocks, each pin having a slope at its lower end, and a plurality of horizontally movable wedge members, each having a slope at its upper end adapted to be mated with the slope of a pin, for controlling the vertical positions of the pins. An assembly is provided for moving the wedge members horizontally, and the moving force is limited to a value less than that which can lift the total weight of the roll and the chocks at the supporting pins. An assembly. is also provided for engaging the peripheral face of the roll near the chocks and for moving the roll from a nongrinding to a fixed grinding position in the chocks.

4 Claims, 5 Drawing Figures PATENTEU 3,896,594

1 ROLL GRINDING DEVICE INCLUDING CI-IOCK POSITIONING MEANS REFERENCE TO RELATED APPLICATION This application is a continuation-in-part of my copending application Ser. No. 202,770, filed Nov. 29, 1971, now abandoned.

BACKGROUND OF THE INVENTION The present invention relates to a roll grinder,and, in particular, to a roll grinding device adapted to be attached to such a roll grinder without removing its bearings and chocks to fix the bearings and chocks in their proper positions, to thereby provide a support for the roll, whereby the roll which is used in rolling or other operations can be re-ground.

Heretofore, since such rolls have been generally supported by bearings at opposite ends of their bodies, when such a roll was to be re-ground it has been necessary to first remove the chocks which receive the bearings and then to support the roll by a cradle of the roll grinder at the journal portions thereof.

However, the mounting and removing of the chocks for every re-grinding of the roll requires considerable time and labor, and it is possible to damage the bearings and the fixing means.

SUMMARY OF THE INVENTION An object of the present invention is to provide a grinding device which can be mounted on a roll grinder without removing its bearings and chocks, and by which an excellent re-grinding is possible without using any special or complicated machinery.

The present invention is directed to a roll grinding device for a roll grinder, which comprises, characterizingly, a plurality of pins for supporting chocks, each having a slope at its lower end; a pluraliity of wedges, each having a slope adapted to be mated with the slope of a pin, for determining the vertical position of said pin; means such as fluid piston and cylinder units for moving the wedges in the horizontal direction and for limiting the moving force of said wedges such that it is less than the force which causes a lifting of the total weight of the roll and the chocks at the position of the pins; and shoes adapted to urge the peripheral face of the roll near the chocks to a grinding side for fixing the position of the roll in the chocks.

BRIEF DESCRIPTION OF THE DRAWINGS Other objects and features of the present invention will become apparent from the following description of a preferred embodiment of the present invention shown in the attached drawings, in which:

FIG. 1 is a schematic plan view of an embodiment of the apparatus of the present invention when a roll is mounted;

T FIG. 2 is a side elevational view of a cradle having LII bearing 17 and the outside of the support spindle 19 is greatly exaggerated for purposes of illustration.

DESCRIPTION OF THE PREFERRED EMBODIMENT A roll 15 having support spindles I9 at either end thereof is initially provided with a driving dog 1 rotated by any suitable means as, for example. an electric motor. The roll 15 is then mounted on a grinder. Then, as shown in FIG. 1, a center 14 of a loose tail stock 2 is advanced and, together with a center of a head-stock 3, supports the roll 15 as well as centers the same, The grinding wheel may translate with respect to the roll or vice versa, but conventionally, and as shown, the grinding wheel translates reciprocally with respect to the roll. The relative motion of the two may be secured by any conventional means as, for instance, a rack secured to the frame, a spiral gear mounted on the housing containing the grinding wheel, a suitable motor contained in the housing to drive the spiral gear. and means for reversing the direction the spiral gear is driven at either end of the grinding wheels traverse.

In this case, beneath two chocks 16, a cradle 4 is provided, a slight gap d being provided between the chocks 16 and the cradle 4 (See FIG. 2). Further, a plurality of supporting pins 5, e.g., four, are provided on the upper face of the cradle 4, and all of the supporting pins 5 abut the lower faces of the chocks 16 by means of an oil pressure operation, the supporting pins being stopped by appropriate control means at positions where they bear the loads equally. This is necessary because the lower faces of the chocks 16 with which the supporting pins 5 are engaged are not completely flat. Accordingly, the supporting pins are provided for eliminating troubles during the grinding operation, such as swinging due to unstability or setting which causes an undue amount of wear on the bearings.

The operating mechanism of the supporting pins 5 is shown in FIGS. 3 and 4. In FIG. 4, numeral 9 is a distributor valve, and the pump PF is a power source which forces pressurized fluid into conduits in order to move the pistons 7 in the cylinders 6. When the supporting pins 5 receive the lower portions of the chocks 16 and a push button actuating the pressure controlling means PC is depressed, a solenoid SOL. 1 associated with valve 9 is energized to feed fluid under pressure into the cylinders 6. For example, four cylinders 6 are provided so that four pistons 7 in the cylinders are actuated to shift four wedges 8 laterally or to the right as shown in FIG. 3, to thereby move the supporting pins 5 upwardly.

When the pushing force derived from the oil pressure cylinders 6 is smaller than the total weight of the chocks 16 including at least roll 15, the supporting pins 5 do not push the chocks 16 upwardly but it does eliminate the gap between the pins 5 and the lower faces of the chocks 16 (See FIG. 2). In this manner, the respective supporting pins 5 are stopped at the positions where the gap between the pins 5 and the lower faces of the chocks 16 is eliminated, i.e., when the upper faces of the pins 5 contact the lower faces of the chocks 16.

Since the wedges 8 are held in their positions, the supporting pins 5 are not moved downwardly by the weight of the chocks l6 and the roll 15, even though the push button of the oil pressure operation is released, or the center 14 is retracted to separate it from centering operationand before the grindingoperation;

from slipping laterally and fallingdown. 7 Although, in this manner, it is possible to the roll IS'after the completion of the aforementioned w gardless of whether they are of the flat type'or of the rolling type. Accordingly, the, precision working of workpieces-such as a completefcircle and circularcyl 'inder is very difficult. V P V To alleviatezthis. problem; a stabilizing mechanism shownin FIG. 5 is provided for stabilizing the support-. 7 ing positions at which the body of the roll ISfis received. The numer'al 13 represents shoes, andywhen the body of the roll-15is engaged byithe shoes 13, the

roll 15 is'shifted in the horizontal direction by a certain amount 8 because the center 0', of the support spindle 19 is lower, than the centerfl of the bearing 17 by a half of the gap theresbetween. The shoes 13are'mounted on the frame of the machine, as may be seeniinFlG. 5, and a the motion thereof requiredto' keep'them in'urging 17 and the ,diameterpf the" suppam mdie l9,"and P r is the urging force of one of'theshoes 13:"

1 contact with'the roll I5 may :be provided by meansrot a screw and motor, fluidicylinders, or any other appropriate means, many of whicharelwllknown to the art I per se. Theshifted amountfi can be calculated from the following formula where W is the weightof therollalS, Ee is the, difference between th'ediarneter of the bearing Accordingly,-if the urging force? of theshoesi3is as large as possible withoutscratching or flawing the roll 15, and the shift amount 5 in the horizontal diirec tion is large, the body of the roll 15 is reduced by the grinding operation, and the center position of the roll is changed while the amount 6 remains constant. Therefore, it is not necessary to move the shoes while grinding, unless the reductionof the roll radius reaches 8 and the urging force becomes substantially Zero.

In accordance with the present invention, if, as shown in FIG. 2, either the distance X or y from the face recieving the checks 16 is constant, the centering operation of the center 14 can be eliminated by providing sheet'metal '10 of a predetermined th'icknesson the 5 upper face ofthe cradlel po'sitioning the-Chocks '16 on. the sheet ,rnetal andathereafterIraisingithesupporting f j pins-5;'setting, forthe frontand backdirectiomthe ad-": justingEscrew .l lfprovided 'on the 'brateus depending upon thefdistance" Xi, and tightenin'g'the screw'llso I ithatitiisinfurging contactwithithefscrewilI.f' I 'Accordihg tothe present'ifn ventiottntls'will Bearskin ,from the foregoing description, owing to thecombinw Q tion of a suitable numbferof supporting pins 5'for re ceiving the checks 16, which are moved vertically and, I held intheir positions bythe wedges 8,"anditheshoes 13 for preventin g'the roll from vibratingithe rolllS can,

besupported by 'thebe'aring portions 17 of the Chocks 16,.leavi'ng the chocksas theyare', and can be very eas j W ily reground under the. same conditions as thosetmderg whieh'therollis used. Thus, the necessityofthe mount-f ing and removingofthechocks l6 iseliminated There-Q fore, the workingoperation can be'considerably Simpli- 'fied and the roll being r'e'ground is'not subject to any vi "bration. r g f I I In particular, according to the present in ventio'n, y 2 since the'mechanical construction isvery simple, it can i I be applied 'topthe conventional universal 't'ype'roll j grinder withoutany modification. What is claimed is: i

,1. ;A u grinding. devi erforiai I an" suppmed y Y checks, said device cornprisingz a pluralityof movable 1 supportingpinsforfsnpportingthe chocks, saidpins having, sloped; lower, facefsty ahpltirality of.;movablez a o wedgeshaying'sloped upperifaces adapted to mate with I a the sloped'tacesoofisaid ttpportingpinsfo'rdetewhining]" the vjertical positions of saidlsupporting' pinsg meansfor" moving said wedges and. for'limiting' the moving force to a value less than 'that'which can lift the total weight, of the roll and said checks at said supporting pins; and" I j means for engaging the-peripheralfaceof the roll near;

said checks. andfor urging the rollitoa grinding posi i tion, thereby fixing the 'po sition of the roll withinlthe l chocks. V 7 V 2. The roll grinding device of claim 1 "wherein said means for moving said wedges comprises a fluid actuated piston and cylinder unit.

3. The roll grinding device of claim 1 wherein said wedges are movable in a substantially horizontal direction, and said pins are movable in a substantially vertical direction.

4. The roll grinding device of claim 1 wherein said means for engaging and urging the roll comprises a plu-

Claims (4)

1. A roll grinding device for a roll supported by chocks, said device comprising: a plurality of movable supporting pins for supporting the chocks, said pins having sloped lower faces, a plurality of movable wedges having sLoped upper faces adapted to mate with the sloped faces of said supporting pins for determining the vertical positions of said supporting pins, means for moving said wedges and for limiting the moving force to a value less than that which can lift the total weight of the roll and said chocks at said supporting pins, and means for engaging the peripheral face of the roll near said chocks and for urging the roll to a grinding position, thereby fixing the position of the roll within the chocks.

2. The roll grinding device of claim 1 wherein said means for moving said wedges comprises a fluid actuated piston and cylinder unit.

3. The roll grinding device of claim 1 wherein said wedges are movable in a substantially horizontal direction, and said pins are movable in a substantially vertical direction.

4. The roll grinding device of claim 1 wherein said means for engaging and urging the roll comprises a plurality of shoes.

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