US2063668A - Roll grinding machine - Google Patents

Description

Dec-8,1936. e; G. FLYGAR'E Em. j 2,063,668

ROLL GRINDING MACHINE Filed DeC. 31, 1934 3 Sheets-Sheet 1 FTQ] 4 IMQ/VWA CAR/ G. FLYG/lm: HUGO B. FR/BERG @Hm @W 8,v 1936. c. G. FLYGARE ET AL,v

ROLL GRINDING MACHINE Filed Deo. 31, 19s4 :s shee-sheet 2 ma 0*/1 m7 2.

CARL GPU/GARE HUGO B. [TR-:BERG w @Mm H. my

Mhwmn.

Dec-18 1936 C. G. FLYGARE r-:r AL. 2,063,668

- ROLL GRINDING MACHINE i Filed Deo. 51, 1934 5 sheets-sheet s SOLENOID e HIGH PRESSURE LOW PRESSURE EXHAUST L INE TO T SUCTION LINE TO TANK www n. I cmd wm CARL G. F/ YGARE m "QM- Hm Patented Dec. 8, 1936 UNITED STATES PATENT OFFICE Application December 31, 1934, Serial No. 759,948

16 Claims.

This invention relates to grinding machines for grinding large rolls, such as used in r'olling mills, and more particularly to a forming or crowning attachment for producing a predetermined crown in the surface of the roll.

In rolling mill operations, it is necessary that the periphery of the rolls between which the metal is rolled be provided with a surface having the proper crown as well as a mirror finish, since any irregularities or imperfections in the surface of the roll are reproduced in the product rolled by the mill. It is, therefore, essential that the periphery of the roll be ground to a mirror surface of desired quality, as well as to be ground f' with a predetermined crown on its periphery so that when the two opposed rolls are mounted in the rolling mill, they will produce a product rolled therebetween which meets the required speciiications.

Heretofore, numerous forming or crowning attachments have been developed and utilized in the grinding of rolls to produce the desired curvature on the surface of the rolls. Various types of mechanisms have been utilized including flexible forming bars, rigid forming bars, and also adjustable supports for the roll being formed which enable the axis of the roll to be skewed relative to the axis of the wheel.

It has been found through years of experience and numerous tests which have been conducted with the various roll forming attachments which are now utilized, that there is a bending or flexing of the swivel table supporting the roll during grinding, due to the pressure exerted by the forming apparatus and the pressure of the grinding wheel. It has been proposed to overcome such difficulties by means of the construction shown in the U. S. patent to H. W. Dunbar and Carl G. Flygare, No. 1,970,000, dated August 14, 1934. This roll forming attachment depended upon a fluid pressure system. in which fluid under pressure was forced into cylinders on opposite ends of the table to cause a swiveling movement of the table as it reciprocated. This invention 45 relates to an improvement in that construction, in

that it provides a positively actuated control device which regulates the rotative crowning movements of the wheel and the work and thus insures that the work is ground to a predetermined shape.

It is the primary object of this invention to provide a roll crowning apparatus for a grinding machine in which a hydraulically actuated, mechanically permitted swivelling movement is employed to produce a crown of the desired curvature.

It is another object of this invention to provide a suitable fluid pressure operated mechanism for causing a relative swiveling movement between the work supporting table and the longitudinally movable table and to provide a positive control mechanism for regulating the movement of the swivel table as caused by the fluid pressure system.

It is a further object of this invention to provide a pressure controlling device which serves to permit regulation of the fluid pressure within the system so that the table may be initially flexed or bowed before the grinding operation has been started.

In a massive roll grinding machine of the type to which the present invention relates, the headstock is a massive, heavy unit which is usually many times as heavy as the footstock. This differential of weight at opposite ends of the swivel table serves to cause a differential friction between the opposite ends of the swivel table and the longitudinally movable table which must be overcome by the forming attachment, `in order that the curvature or crown at each end of the roll may be properly shaped. Hence, it is desirable to provide a suitable pressure control means so that the pressure applied to the cylinder at either end of the table may be varied as desired.

It is a further object of the present invention to provide a pressure control for the fluid pressure system which enables applying a variable pressure at either end of the swivel table, if desired, so that the variation in pressure serves to compensate for the varying friction between the parts and to prevent bowing of the table from its normally adjusted position.

One embodiment of this invention has been illustrated in the drawings, in which like reference numerals indicate like parts:

Fig. 1 is a front elevation of a grinding machine embodying this invention;

Fig. 2 is a combined fragmentary plan view and diagrammatic View to show the piping and electrical circuit of the machine;

Fig. 3 is a fragmentary cross-sectional view, on an enlarged scale, of the limit switch shown in Fig. 2;

Fig. 4 is a fragmentary longitudinal section, approximately on the line 4-4 of Fig. 3, showing the limit switch for reversing the direction of iiow of electrical energy in the system;

Fig. 5 is a fragmentary plan view, on an enlarged scale, of the operating parts of the crowning control mechanism at the left-hand end of the swivel and longitudinal table;

Fig. 6 is a fragmentary cross-sectional view, taken approximately on the line 6 6 of Fig. 5;

Fig. 1 is a cross-sectional view, taken approximately on the line 1-1, showing the details of the crown control mechanism; and

Fig. 8 is a diagrammatic showing of a modied hydraulic system having a pressure control valve which permits a variation in the iiuid pressure passing to cylinders at opposite ends of the table.

This invention comprises broadly a roll grinding machine, in which the roll to be ground is rotatably supported on a swivel table. The swivel table is povotally mounted on a longitudinally movable work table which is arranged to be reciprocated longitudinally so as to carry the roll to be ground past the periphery of the grinding wheel. A fluid pressure mechanism is interposed at opposite ends of the table between the longitudinally movable table and the swivel table to swing the swivel table relative to the longitudinally movable table as it reciprocates. A positively actuated mechanical control device is provided to regulate and control the swiveling as caused by the hydraulic mechanism so as to produce a desired crown on the periphery of the roll being ground.

As illustrated in the drawings, one embodiment of this invention has been shown as adapted for a large, massive roll grinding machine comprising a base I0 having a longitudinally movable work table II reciprocably mounted on a flat way I2 and V-way I3 on the base I0. A grinding wheel I4 is rotatably mounted on a wheel slide (not shown) which is arranged for a transverse feeding movement relative to the table II by means of a manually or power operated wheel feeding mechanism I5. Details of the wheel feeding mechanism have not been illustrated, since they do not constitute a part of this invention. For details of construction as to the mounting of the grinding wheel and the construction of the wheel feeding mechanism, reference may be had to the prior U. S. patent to Norton No. '162,838 dated June 14, 1904. A swivel table I6 is pivotally connected to the longitudinally movable table II by a pivot pin I1 and is arranged so that the swivel table I6 may swivel about the pivot pin I1 as the longitudinal table reciprocates so as to cause a relative transverse movement between the grinding wheel and the work and produce a desired crown upon the periphery of the work being ground. The swivel table I6 carries a rotatable work support including a headstock I8 and a footstock I9 which serve to rotatably support a work piece 2U on centers 2I and 22 respectively.

The longitudinally movable table I I may be reciprocated longitudinally relative to the base by means of a manually operable hand wheel 25 or may be moved by a power actuated mechanism in which the table is automatically reversed by adjustable dogs 26 and 21 and a reverse control lever 28. For details of the manual traverse or power actuated reciprocating mechanism, reference may be had to the prior Norton Patent No. 162,838 above referred to.

Hydraulic crowning mechanism In order that the swivel table I6 may be swivelled transversely in a horizontal plane relative to the longitudinal table II when the table reciprocates, a hydraulic mechanism is provided to ,cause the desired transverse movement between the tables so as to produce a desired predetermined curvature or crown on the periphery of the roll 20 being ground. The hydraulic mechanism is preferably a self-contained mechanism which is mounted on the reciprocable table II and consists of an electric motor 3D connected to a fluid pump 3|. The pump 3| draws fluid through an intake pipe 32 from a reservoir (not shown) and delivers uid through a pressure control or relief valve 33 through a pipe 34 and a reverse valve 35. The reverse valve 35 is arranged to convey iiuid to opposite sides of a piston 36 which is slidably mounted in a cylinder 31. The cylinder 31 is xedly mounted on the table II, and the piston 36 is connected by a link 38 to an extending bracket 39 formed as an integral part of the swivel table i6. It will thus be seen that admission of uid under pressure to either side of the piston 35 will cause a swiveling movement between the longitudinally movable table I I and the swivel table IB.

In the preferred construction, a double fluid pressure actuating means is provided, such as illustrated in Fig. 2 of the drawings. Such a mechanism includes a fluid pressure piston and cylinder at the right-hand end of the table, which is identical in every respect to the piston and cylinder at the left-hand end. This mechanism comprises a cylinder 40 fixed to the table I I and a piston 4I slidably mounted therein and connected by a link 42 with a projecting bracket 43 of the swivel table I6.

The reversing valve 35 is operatively connected with the cylinders 31 and 40 by means of pipes l5 and 43. The pipe 45 connects with the lower chamber d8 of cylinder 31 and the upper chamber t9 of cylinder lill, as 'viewed in Fig. 2. The pipe s6 is connected with the upper chamber 50 in cylinder 31 and the lower chamber 5I in cylinder 4G, so that when pressure is applied to either the pipe 45 or 36, the iiuid under pressure serves to cause a swiveling movement of the table I6 relative to the reciprocable table II either in a clockwise, or counterclockwise direction, as Viewed in Fig. 2. In the position of the reversing valve 35, as illustrated in Fig. 2, fluid under pressure is being admitted through pipe 45 to cylinder chambers 138 and 49, so as to cause the swivel table Ill to move in a clockwise direction. The fluid pressure remains in this direction until the reverse valve 35 is shifted.

lt is desirable to provide a suitable interconnection between the reciprocable table and the fluid pressure system so that when the table is moved in a direction toward the right (Fig. 2), the table I4 is moved in a clockwise direction. When the reversing mechanism is shifted to change the direction of movement of table II, the fluid pressure reversing valve 35 is shifted to reverse the swiveling movement of table I4 so that during movement of table I I towards the left (Fig. 2) the swivel table I6 is moved in a counterclockwise direction. This is preferably accomplished by an electrically controlled mechanism which, in the preferred construction, is interconnected with the table reversing mechanism so that when the adjustable dogs 2E and 21 actuate the reversing lever 23 to change the direction of movement of the table I I, this moveient also serves to operate reverse valve 35 and thereby change the direction of iiow of fluid pressure within the hydraulic system. To accomplish this result, a solenoid 52 is mounted on the table Il and is connected to operate the revers- `ing valve 35 in one direction, namely, downwardly.. as shown inFi'g. 2. A spring 53 serves to return the valve into the position illustratedv in Fig. 2. A reversing switch 54 is connected by a link 55 with the reversing lever 28- so that when the switch is inl the positionv as illustrated in Fig. 2, the circuit is open and the solenoid 52 is deenergized. When the reverse lever is shifted into the reverse position at the end of a table stroke, the reversing switch shifts intothe position illustrated in the dotted line (Fig. 2), thereby energizing solenoid 52 and shifting the reversing valve 35 into a downward position` (Fig. 2) so as to admit fluid under pressure through the pipe 4.6 into cylinder chambers U and 5I to cause the table to move in a counterclockwise direction. It will thus be seen that when the table II travels in one direction, the iiuid pressure piston and cylindex' serve. to swivel the table in one direction andi when moved in the opposite direction serve to swivel the table in the reverse direction.

Mechanically controlled swiveling movement In order that the swiveling movement of the table I4 relative to the reciprocable table Ill may be accurately controlled, it is desirable to provide a positively actuated permitting or controlling mechanism which serves to restrict the movement of the table by the fluid pressure mechanism, so that instead of having a directly acting fluid pressure movement, a hydraulically actuated, mechanically permitted or controlled movement is provided. It is desirable to provide a suitable control mechanism which is actuated as the table reciprocates to positively control the swiveling movement of the swivel table I4 so as to produce a predetermined crown on the roll to be ground. In the preferred construction, a forming bar 60 is pivotally mounted on a stud 6I on the base I0 and is arranged to be adjusted angularly relative to the base, so that it may be positioned parallel with the movement of the reciprocatory table II to grind a straight cylindrical roll, or it may be adjusted angularly relative to the table movement if it is desired to produce a crown on the periphery of the roll being ground. A slide 62 is carried by the bar 66 and is operatively connected by means of a bar 63 with a bracket 64 which is fixedly mounted to table II. It will be readily appreciated from the foregoing disclosure and the illustration in the drawings that when the table I I is reciprocated longitudinally relative to the base I0, the slide 62 is moved simultaneously by means of the bracket 64 and the rod 63.

In orderthat the uid pressure system maybe so controlled as to produce a predetermined crown or curvature on the roll being ground, a suitable, positively actuated, mechanically controlled or retreating stop mechanism is provided which in the preferred form comprises a rotatable screw 65 which is journaled in bearings 66 and 61 in the bracket 64. A partial nut 68 meshes with the screw 65 and is pivotally connected by means of a pin 69 to bracket 39 which projects from the end of the swivel table I4. It will be readily appreciated from this disclosure and the illustration in Figs. 5 and 7 of the drawings that rotation of the screw 65 relative to the nut 68 serves to definitely control and limit the swiveling movement of the table I6 relative to the table II. f

In order that the swiveling movement may be definitely controlled by and in timed relationship with the longitudinal reciprocation of the Work carrying member, a suitable connection is provided between the forming bar andthe screw. The longitudinal. movement of. the slide A62 relative `to bar 60- is transmitted to cause a predetermined rotary motionv to the screw 65 so as to cooperate with the nut 68 and permit a predetermined swiveling, movementv of the table I4 relative to the table II by means of the fluid pressure piston 36. In order to control the rotary motion of the screw G5. to produce the desired crownv on the. surface of thev roll, a rack bar 15 is slidably mounted within bracket 64 and is connected at its. lower end with the slide 6.2. The rack bar 1.5 meshes with a. gear 1.6 mounted on the outer end of the screw shaft 55. It will be readily appreciated. from the foregoing disclosureV and the illustration in the drawings that when the .table II is reciprocated. relative to the base, the slide 6,2. will be carried through a corresponding distance along the forming bar 60. This bar 69 is set parallel to the table movement; then no movement will be transmitted to allow or permita swiveling movement of the table I4. If, however, the forming bar is adjusted angularly relative to the path of movement of the table II, a movement of the slide 62 along the bar 60 will transmit a vertical motion to the rack bar 15 relative to the bracket 64 which is. iixed to the end of the table II, so as to transmit a rotary motion to gear 16 and screw 65 so as to permit a. predetermined, positively controlled swiveling movement of the table I4 relative to table Il.

In order to prevent any backlash between the rack 1:5. and gear 16, a compensating mechanism is provided comprising a narrow, slidably mounted rack bar 11 whichis slidably mounted in the face of the rack 15. This adjustable rack 11 may be adjusted relative to the rack 15 by means of a. screw 19 fixed in the end of the rack'bar 15 and nuts 8|!v and 8l. By adjusting the. nuts 86 and BI relative to screw 19, any backlash between the rack and the gear may be eliminated. I

The foregoing describes a single control unit at the left-hand end of the machine, as viewed in Figs. 1 and 2. In the preferred construction, an identical control unit is provided at ythe righthand end of the machine, as illustrated in Figs.

l and 2. This unit comprises a forming bar 85 pivotally mounted on the stud 86 and carrying a slide 81 thereon. The slide 81 is carried longitudinally by a bar 88 which is connected tothe slide and is slidably mounted in a bracket 89 projecting from the right-hand end of table II. A rack bar 90, also carried by slide 81, is slidably mounted in bracket 89 and meshes with a gear 9I mounted on lthe end of a screw 92 which meshes with a. nut (not shown )on a bracket 93.

In the preferred adjustment of parts, the

forming bars 6 andv 85 are adjusted to the samev angular position, so that when the table moves toward the right, as Viewed in Figs. l and 2, the forming bars, slides and screws 65 and 92 together with their connecting parts serve to control the swiveling movement of table I6 relative to table II in a counterclockwise direction; and similarly, when the table is reversed in its direction of movement so that it moves toward the left, as viewed in Figs. 1 and 2, serve to transmit a rotary motion to screws 65 and 92 so 'as to control the movement of the swivel table I6 in a counterclockwise direction relativeto table II to produce the desired predetermined crown on the periphery of the roll 20 being ground.

Pressure lcontrol device In a massive roll grinding machine of the type illustrated in the drawings and to which this invention applies, the tables, headstock and footstock are massive, heavy parts. The headstock is several times heavier than the footstock, thereby causing a differential in friiction between the swivel and longitudinally movable tables at their opposite ends. If equal pressures were applied to the cylinders at opposite ends of the table, this would result in possible flexing of the table from its normal path of movement, due to the fact that the frictional forces are greater at the headstock end than at the footstock end.

To attain one of the objects of this invention, namely, to provide a differential in the iluid pressure system which enables separate adjustment and regulation of the fluid pressure being applied to each cylinder at opposite ends of the table, a suitable pressure control valve is provided which permits applying a higher pressure to the cylinder 3'! than that applied to cylinder 40, so that the differential in friction between the swivel and longitudinally movable tables may be equalized. In the preferred form, this mechanism (Fig. 8) comprises a modified piping and fluid pressure system including a pump which is connected by pipe |0| with a pressure control valve |02. The pressure control valve is connected to a reverse valve |03 which is in turn connected to cylinders 3'] and 40. Fluid from the pipe |0| enters the pressure control valve chamber |04 and passes through pipe |05 into reverse valve chamber |06 which, in the position illustrated in Fig. 8, passes fluid through pipe |01 into cylinder chamber 50. The valve member |08 is yieldably held in a closed position by a spring |09, the tension of which may be adjusted by screw ||0. The screw ||0 may be locked in adjusted position by lock nut 1H. By manipulation of the adjusting screw l0, the tension of the spring |09 may be varied, so that the desired pressure will be maintained in pipe line |05, but so that if the pump pressure is greater than that required in line |05, the pressure is relieved by partially opening the valve |08. When valve |08 is opened, uid under pressure passes through a passage ||2 into chamber ||3 through a pipe H4, valve chamber H5, pipe ||6, into cylinder chamber 5|. In the position of the valve illustrated in Fig. 8, the pistons 36 and 4| apply a force to the swivel table |4 tending to move the swivel table in a counterclockwise direction. A valve'member is backed by a spring ||8, the tension of which may be adjusted by a screw ||9 and lock nut |20, so that the pressure in the pipe line ||4 may be varied as desired. If the pressure within the chamber ||3 is greater than that required in the pipe line H4, the excess pressure will cause the valve ||'|to open and the fluid to exhaust through pipe |2| into the reservoir.

It will thus be seen that by utilizing a modified construction, such as that shown in Fig. 8, the pressure applied at opposite ends of the swivel table to cause the desired swiveling motion may be varied to overcome the differential of friction between the swivel table and the longitudinally movable table.

Conccwe crown In certain types of grinding, it is necessary to produce a concave crown on the periphery of the roll. When the bars 60 and 85 are adjusted into position 60a and 85a, as indicated in Fig. 1, this adjustment operates through screws 65 and 92 to shift the position of the swivel table 4 so that at the start of the grinding operation, the end of the roll is farther away from the wheel axis and as the roll is traversed or reciprocated, the screws serve to swivel the table so as to produce a hollow or convex surface on the periphery of the roll. In order to assist in this reverse movement of the table, it is necessary and desirable that the fluid pressure system be reversedautomatically without attention on the part of the operator, so that when the bars are in a position to concave the roll, the fluid pressure system serves to apply a swiveling movement to the table I4 so as to produce the desired concave surface on the periphery of the roll. To accomplish this result automatically, a reversing switch |30 is mounted on the base of the machine. This .switch carries a reversing arm |3| having a roller |32 engaging a cam |33 which is adjustably fixed to the forming bar 60. This construction is diagrammatically indicated in Fig. 2 and shows the bar in the full line position, as indicated in Fig. 2, the roller |32 is on the low point of the cam |33. When the bar 60 is shifted into position 60a, the bar 60, as illustrated in Fig. 2, moves upwardly, carrying the cam 33 upwardly, which serves to rock the roller |3| and arm |32 of the reversing switch |30 so as to shift the movable switch member into the reverse direction, so as to reverse the operation of the fluid pressure system to enable the grinding of a concave surface on the roll being ground.

In setting up the forming attachment for grinding a given roll, it is desirable to apply a predetermined pressure at opposite ends of the table so as to bow or flex the table to take out the spring in the swivel table parts, so that during the operation of the machine, the swivel table is always under a flexing tension. In order to initially flex the tabie to a desired and predetermined extent, each of the rack bars 'i5 and 90 is adjustably connested to the slides 62 and 8l respectively. The lower end of each rod has a reduced threaded portion |36 which passes through an aperture in the slides 62 and 3l respectively. Nuts |31 and |38 are provided to locate the rack bars l5 and 90 respectively relative to the slides 62 and 81. By

adjusting the nuts |37 and |38 at each end of the table, the racks 'i5 and 90 may be moved up or down, causing a rotation of the gears 16 and screws 65 and 92, which serves to flex or bow the swivel table |4 to place it under an initial strain to prevent any exing of the table due to the movement transmitted thereto by the forming attachment or the thrust of the grinding wheel.

In the preferred form of this invention, the gears T6 and 9| are adjustably mounted on the screw shafts 65 and S2 and are held in adjusted position by lock nuts |35. This adjustment is identical on both mechanisms at the ends of the table, and consequently only details of the lefthand mechanism have been illustrated in Fig. 7. It will be readily appreciated from this construction that the operator may by striking oi on the nuts, adjust the gears 76 and 9|, so that they operate in synchronism.

The operation of this machine will be readily apparent from the foregoing disclosure. The operator places a roll to be ground in the machine, rsupporting it on centers or in any wellknown manner common to the roll grinding industry, such as journal rest supports; then adlll aoeacc justs the position of the forming bars- 60- and 85 so as to produce a desired and predetermined convex or concave crown on the roll to be ground. The table reciprocation is started and as the table I I reciprocates relative to the base l0, the swivel table I6 is rocked about the pivot Il as an axis to vary the center distance between the axis of the Work and the axis of the grinding wheel duri-ngr reciprocation, so that either a concave or a convex crown'may be produced on the roll, as desired.

Having thus described the invention, what we claim as new and desire to secure by Letters Patent is:

l. A roll grinding machine having a rotatable grinding wheel and a rotatable work support which are movable transversely and longitudinally relative to each other, means to move one of said members relatively toward and from the other to produce the desired feeding movement to grind a roll to a predetermined size, an additional mechanism operatively connected to cause an independent relative transverse movement between the wheel and work support as they are reciprocated longitudinally relative to each other to grind'a crown onl the roll being ground, and a positively actuated control device independent of said mechanism which is actuated during the relative longitudinal movement between the grinding wheel and work to positivelycontrol said independent relative transverse movement between the wheel and the work support as caused by said mechanism so as to produce a predetermined crown on the roll being ground.

2. A roll grinding machine having a rotatable grindingwheel and a rotatable work support which are movable transversely and longitudinally relative to each other, means to move one of said members relatively toward and from the other to produce the desired feeding movement to grind a roll toa predetermined size, a fluid pressure mechanism operatively connected to cause an independent relative transverse movement between the wheel and work support as they are reciprocated longitudinally relative to each other to grind a crown on the'roll being ground,`and a control device including a positively moved stop which is actuated during the relative longitudinal movement between the grinding wheell and work to positively control the independent relative transverse movement of said members as caused by saidiluid pressure mechanism so as to regulate and control lthe relative movelnent between the wheel and work support to produce a predetermined crown on the roll being ground.

3. A roll grinding machine having a rotatable grinding wheel and a rotatable work support which are movable transversely and longitudinally relative to each other, means to move one of said members relatively toward and from the other to grind a roll to a predetermined size, an additional mechanism operatively connected to cause a relative transverse movement between the wheel and work support as they are reciprocated longitudinally relative to each other, and a control device including an adjustable bar and follower and a Vstop positively moved thereby which serve to regulate and control therelative transverse movement between thewheel and work support so as to produce a predetermined crown on the roll being ground.

4. A grinding machine comprising a base, a transversely movable slide thereon, arotatable grinding wheel supported on said slide, a longitudinally movable-table on said base, aswivel table' pivotally mounted on said first table, a rotatable work support on said swivel table, fluid pressure means interposed between said tables to cause the swivel table to swing relative to the longitudinally movable table as it reciprocates, and a positively actuated control device independent of the hydraulic mechanism which regulates and controls1 said fluid pressure operated swiveling movement of the swivel table as the longitudinally movable table reciprocates and so produces the desired form on the roll being ground.

5. A roll grinding machine having a rotatable grinding wheel and a rotatable work support which are rmovable transversely and longitudinally relative to each other, means to move one of said members relatively toward and from the other vto produce the desired feeding movement to grind a roll to a predetermined size, a fluid pressure system including a piston and cylinder which are operatively connected to cause a relative transverse movement between the wheel and work support as they are reciprocated longitudinally relative to each other, and means including an adjustable bar and follower and a control device actuated by the follower and independent of the fluid pressure mechanism which serves to regulate and control the relative movement between said members caused by said lluid pressure piston and'cylinder so as to regulate and control the relative movement between the wheel and work support to produce a predetermined crown on the roll being ground.

6. A grinding machine comprising a base, a transversely movable slide thereon, a rotatable grinding wheel` supported on said slide, a longitudinallymovable table `on said base, a swivel table pivotally mounted on said iirst table, Aa rotatable'work support on said swivel table, a fluid pressure system including a piston and cylinder interposed between said tables to cause the swivel table to swing relative to the longitudinally movable table as it reciprocates, a forming bar adjustably xed on the base, and an independently actuated control mechanism and connections between said device and the bar, the longitudinally movable table and the'swivel tabley to positively control the extent of swiveling of said swivel table as the table reciprocates to lproduce the desired form on the roll being ground. 7. A grinding machine comprising a base, a transversely movable slide thereon, a rotatable grinding wheel supported on said slide, a longitudinally movable table on said base, a swivel table pivotally mounted 'on said rst table, a rotatable work support on said swivel table, a fluid pressure system including va piston and cylinderinterposed between said tables to cause the swivel table to swing relative to the longitudinallly movable table as it reciprocates, a forming bar ad-justably lixedV on the base, means including a nut and screw mechanism interposed between the longitudinally movable and swivel tables, and connections between said bar and screw to rotateV said screwV as the table is reciprocated. to positively control the extent of swiveling of said swivel table as the table reciprocates to-produce the desired form on the roll being ground,

8. In a roll grinding machine having a transversely movable wheel'slide, a longitudinally movable work table,a work supporting member pivotally mounted on said table and arrangedl yto rotatably support a roll in operative relation with the grindingwheel, and a 'forming apparatus including a barv adjustably positioned on the base, aisne@ carried by said bar as the tame vmoves longitudinally, a uid pressure system including a piston and cylinder operatively connected between the ends of the longitudinally movable table and the swivel table, and means including a nut and screw interposed between said longitudinally movable table and swivel table which are actuated by said. slide as the table is reciprocated to positively control the swiveling movement of said table to produce the desired crown or form on the periphery of the roll being ground.

9. A forming attachment for roll grinding machines comprising a transversely movable wheel slide, a rotatable grinding wheel thereon, a longitudinally movable table, a swivel table pivotally mounted on said movable table, a rotatable work support on said swivel table, a uid pressure system including a piston and cylinder interposed between the longitudinal and swivel tables which are arranged to cause a swinging of the swivel table as the longitudinal table is reciprocated, a fluid pressure pump arranged to convey fluid under pressure to either end of said cylinder, a control valve arranged to control the fluid pressure admitted to said cylinders, and a control device arranged to positively control and regulate the swiveling of said table so as to produce a predetermined crown on the roll being ground.

10. A roll grinding machine comprising a transversely movable wheel slide, a rotatable grinding wheel thereon, a longitudinally movable table, a swivel table pivotally mounted on said movable table, a rotatable work support on said swivel table which is arranged to rotatably support a roll in operative relation with the grinding wheel, a uid pressure system including a piston and cylinder at each end of said table which are operatively connected between the ends of the longitudinally movable table and the swivel table to cause a relative swiveling of the work support as the table is reciprocated, a fluid pressure pump arranged to force fluid to opposite ends of said cylinders respectively to cause the work support to swivel in one direction, a reversing valve arranged to reverse the flow of uid in said system to cause the swivel table to swivel in the opposite direction, and means actuated in timed relation with the table movement to reverse said valve at each end of the table stroke.

11. A roll grinding machine comprising a transversely movable wheel slide, a rotatable grinding wheel thereon, a longitudinally movable table, a rotatable work support supported on said table which is arranged to rotatably support a roll in operative relation with the grinding wheel, a feeding mechanism to move said grinding wheel and work relatively toward and from each other to grind the roll to a predetermined size, a uid pressure system including a piston and cylinder at each end of said table which are operatively connected between the ends of said longitudinally movable table and said work support to cause a relative transverse movement therebetween as the table is reciprocated, and a fluid pressure control device which permits varying the fluid pressure conveyed to cylinders at opposite ends of the table.

12. A roll grinding machine comprising a transversely movable wheel slide, a rotatable grinding wheel thereon, a longitudinally movable table, a rotatable work support supported on said table which is arranged to rotatably support a roll in operative relation with the grinding wheel, a feeding mechanism to move said grinding wheel and work relatively toward and from each other to grind the roll to a predetermined size, a fluid pressure system including a piston and cylinder at each end of said table which are operatively connected between the ends of said longitudinally movable table and said work support to cause a relative transverse movement therebetween as the table is reciprocated, means including a forming bar arranged to positively control the relative transverse movement between the wheel and work, and a fluid pressure control device which permits varying the fluid pressure conveyed to cylinders at lopposite ends of the table.

13. A roll grinding machine comprising a transversely movable wheel slide, a rotatable grinding wheel thereon, a longitudinally movable work table, a swivel table pivotally mounted on said table and arranged to rotatably support a roll in operative relation with the grinding wheel, means to feed said slide toward and 'from the work support to grind a roll to a predetermined size, a iluid pressure system including a piston and cylinder operatively connected between the swivel and longitudinally movable tables, a pump to convey fluid to opposite ends of said cylinder, and a reversing valve operatively connected to change the direction of flow of iiuid in said system when the longitudinally movable table is reversed in its direction of movement.

14. A roll grinding machine comprising a transversely movable wheel slide, a rotatable grinding wheel thereon, a longitudinally movable table, a swivel table pivotally mounted thereon, a rotatable work support on the swivel table, a feeding mechanism to cause a relative transverse movement-between the grinding wheel and 'the work, means to reciprocate said table, and a forming apparatus including a fluid pressure system to swivel said table as it reciprocates including a piston and cylinder interposed between the swivel and longitudinally movable tables, and a control mechanism to positively control the fluid pressure swiveling of said table including a nut and screw mechanism interposed between the longitudinally movable and the swivel table, a forming bar adjustably mounted on the base, a slide slidably mounted on said bar, and connections between the slide and the screw to rotate the screw as the table reciprocates to control the swiveling movement so as to produce a predetermined crown on the roll being ground.

15. A roll grinding machine comprising a transversely movable wheel slide, a rotatable grinding wheel, a longitudinally movable work table, a swivel table pivotally mounted thereon, a rotatable work support including a headstock 'and a footstock on said swivel table, a feeding mechanism to cause a transverse movement of the grinding wheel relative to the work, a reciprocating mechanism to reciprocate said table, and a forming apparatus including a fluid pressure system comprising a piston and cylinder at each end of the table interposed between the longitudinally movable table and the swivel table, a pump for conveying fluid under pressure to said cylinders, a reversing valve actuated in timed relation with the table reciprocating mechanism to change the direction of flow of fluid in said system, a pressure control valve in said system which is arranged to permit independently varying the fluid pressure for each cylinder, and a control device to positively control the swiveling movement of said table as caused by said fluid pressure mechanism including a nut and screw interposed between the swivel and longitudinally movable tables, an adjustable forming bar on the 75 base, a slide slidably mounted on said bar, and connections between said slide and screw to rotate said screw as the table reciprocates.

16. A roll grinding machine comprising a transversely movable wheel slide, a longitudinally movable work table, a swivel table p-ivotally mounted on said table, a massive headstock on one end of said swivel table, and a footstock on the other end of said swivel table to rotatably support a roll to be ground in operative relation with the grinding wheel, means to cause a transverse feeding movement of the grinding wheel slide toward and from the work support to grind the work to a predetermined size, means to reciprocate said work support longitudinally relative to the grinding wheel, a fluid pressure system including a piston and cylinder at each end of said table which are interposed between the swivel and longitudinally movable tables to cause a swiveling of the swivel table as the longitudinally movable table is reciprocated, a. i'iuid pressure pump arranged to convey iiuid to opposite ends of the respective cylinders to cause a swive-ling movement in one direction when the table is traversed in one direction, a reversing valve to reverse the direction of uid and cause the swivel table to be swiveled in the opposite direction when the table movement is reversed, means actuated in timed relation with the table reciprocation to reverse the direction of uid movement when the table is reversed, and a pressure control valve which is so arranged as to permit varying the iiuid pressure applied to the cylinders at opposite ends oi said table so as to overcome the diierence in friction between opposite ends of the table and the swivel table caused by the varying weights of the head and foot stock mounted thereon.

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