US2646651A - Hydraulic roll grinder - Google Patents

Description

July 28,1953 B. A. wlLsoN 2,646,651

HYDRAULIC ROLL GRINDER Filed Feb. 15, 1949 4 sheets-sheet 1 @5N NWUANQHNII M a M. m SN@ @MENS m XS QQ Q m um@ @OS SQ RQ 3 Q July 28, 1953 B. A. wlLsoN L 2,646,651

HYDRAULIC ROLL GRINDER Filed Feb. l5. 1949 4 Sheets-Sheet 2 I INVENTOR. @ma new., BY a a,

I July 28, 1953 B. A. wlLsoN HYDRAULIC ROLL GRINDER 4 Sheets-Sheet 3 Filed Feb. 15, 1949 \INVENTOR.

1 /lun BY QM/@M July 28, 1953 B. A. WILSON HYDRAULIC ROLL GRINDER Filed Feb. l5, 1949 INVENTOR.

4 SheetsI-Sheet 4 Patented July 28, 1953 i 2,645,651 sri-c1?.

HYDRAULIC ROLL 'GRINDER Bert A. Wilson, Pittsburgh, Pa., assignor, by mesne assignments, to Blaw-Knox Company, Pittsburgh, Pa., acorporation of Delaware Application February 15, 1949, serial No.l 76,436 c1aims. (01.51-1om This invention relates to new and useful improvements in cylindrical ro-ll grinding machines especially vadapted for use in grinding large rolls for rolling mills.

It is among the objects of the invention to provide a roll grinding machine which shall be hydraulically powered having a wide range of speed and operated by finger-tip control of a few control valves Without the employment of gear Wheels.

It is a further object of the invention to provide an hydraulically operated and controlled roll grinding machine having automatic control means for grinding crowns or concavities on the roll surface.

Itis still a further object of the invention to provide hydraulically operated roll grinding machines in which the several actuating parts 'are separately powered by hydraulic pumps with relief valve controls for maintaining suitable fluid pressures and with means for bleeding off or venting any .air that may be pumped into the L system. s

Still another obj ect of the invention is the provision in an hydraulic roll grinding machine of an hydraulically actuated grinding Wheel carriage or slide and control means for automatically actuating said slide to grind a tapered or curved contour in response to axial movement of the roll table. f

These and other objects of the invention will become more apparent from a consideration of the accompanying drawings, constituting a part hereof, in which like reference characters designate like parts and in which Fig. 1 is va top plan view, partially cut away, of an hydraulically operated roll grindingmachine embodying the principles of this invention Fig. 2 a top plan View, partially in section,.of 'a portion of the machine bed and grinder wheel slide actuating bar;

Fig. 3 a vertical cross sectional view of a control valve for the grinder slide;

Fig. 4 an end elevational View of the valve of Fig. 3;

Fig. 5 a side elevational view, partially'in section, oi' the valve shown in Figs. 3 and 4;

Fig. 6 a top plan View ci the roll grinder unit with a portion of the bed cutl away;

grinding machine unit;

Fig. 12 a cross sectional view of the table astuating lcylinder and plunger;

machine.

l2 Fig. 13 an end elevational view, partially in section, taken along the line I3-I3, Fig. 12; and Y Fig. 14 a diagrammatic view illustrating the hydraulic actuating and control mechanism for the several operating parts of the roll grinding With reference to Fig. 11 of the drawings, the reference numeral I generally designates the grinder bed having ways 2 on which is mounted the grinder table 3 that carriesa head stock 4 anda tail stock 5. Mounted on the bed I `and behind the table 2, as shown in Fig. 7, is a grinder base t on whichis supported acarriage 'I' for a grinding wheel 8 that is driven by a motor 9 through V-belts mounted on pulleys Il) and II. The head stock 4 is driven by an hydraulic motor I2 by V-belt's mounted on pulleys I3 and I4, the latter driving pulley I5 that drivesV the head spindle through pulley I6. The headstock and tail stock are provided `with centers Il and I8 on which the roll to be ground, such as the roll I9, Fig. 1, is mounted, the head stock carrying dogs 20 that interact with the spaces in the Wobbler'2I of the roll I9.

The table 3, as shown in Fig. 7, is mounted for sliding movement in Ways 22 and is actuated by an hydraulic cylinder 23, shown in detail in Fig. 12 and in the diagrammatic view of Fig. 14. It is bolted to the underside oi table 3 at drilled and tapped holes 24 and 25 in cylinder heads 26 and 2l, respectively, to be movable with the table. The cylinder 23 may be stainless steel tubing of suitable dimension. Thevtwo cylinder heads 29 andA 21 may be joined by bolts passing through drill holes 28 in the headsfrom head to'head. Gland'nuts 29 and 3U are screwed o-n heads 26 and 2l to secure the packing'glandsl and 32 and the piston rod packing 33 and 34.

The piston head is made of four parts that consist of an internally threaded sleeve 35 having leather` cups 36 and 3l on both sides thereof, which are held by heads 38 and V39 which are machined complementary to the shape of the cups to hold them against the threaded sleeve 35 to constitute a piston head. The heads 38 and 39 are counterbored Vand provided with threads 40 and 4I. A plurality of seamless tube piston rods 42 and 43 are threaded at their ends to interact With the threads 40 and 4I. Drill holes 44 are provided in the piston heads 38 and 39 as shown. The other ends of rods 42 and43 are provided with threads 45 and 46 to receive nuts 4l and 48. 'When assembled the rods extend through brackets 49 and 50 of the machine bedl. The end nuts 4l' and 48 of the piston rods ride on roller supports 5I and52 and are adjustable relative to the brackets 49 and 50 to provide an a-dinstable longitudinal movement of the piston rod through the brackets. This movement occurs on each reversal of the table 3, establishing a pause in its movement so that when the table comes to the end of'the grinding cut or pass the roll or work being ground will make a revolution before the table starts back in reverse. Fig. 12 shows the end nuts in transition position while the rods 42, 43 are moving; it being understood that the table 3 is then stationary in one extreme position. When one of the nuts 41, 48, abuts against a bracket 49 or 50 as the case may be, the rods and piston come to and remain at rest and further ilow of oil into the cylinder 23 causes the latter to move and propel the table 3 toward its other or opposite extreme position.

The end of travel of the table is also optionally controlled by an adjustable stop comprising an angle bracket or abutment 53 attached to a T-bar 54, Fig.V `l1, of the table and an angle bracket 55 attached to the bed I. An adjusting screw 5E is provided to adjust the stop position of the table at the end of its travel. This travel control means is utilized when grinding the journal necks 51 to bring the grinding wheel up against the shoulders 58 or the .shoulders 59 and B0, or whichever portion of the roll is being ground. The table feed power vholds the table against abutment 53 to provide chatterproof stop.

The hydraulic iluid for actuating the table is transmitted through the ends of the piston rods 42 and 43 by conduits 6| and 82 which, as shown in Fig. 14 of the drawings, are connected to a four-way valve cylinder 63 which is provided with a spool valve 64. Conduits 6| and 62 are connected to ports 65 and 66 of valve housing 63 which is further provided with a double port or gland 61 connected by a conduit 68 to a source of pressure fluid such as a pump E9 that is operated by a motor 10, Fig. 14. Valve 63 is further connected bya conduit 1I to a valve 12 that controls the rate of travel of the table. The fourway valve 63 is further connected by conduits 13 and 14 to a valve 15 for starting and stopping the table movement and a pilot valve 1E having iingers 11 in the path of adjustable stops 18 and 19 is mounted on rod of carriage shown in Fig. 14, which reverses the movement of the table at the end of the table travel. A relief valve is disposed in the drain line 8| of the control valve 15 leading to a sump 82 for the purpose of regulating the fluid pressure independently of the pressure of the fluid at its source, and for this purpose is provided with a valve adjustment 83.

To eliminate any air that may be pumped into the hydraulic operating and control mechanisms, provision is made for the escape of air through a needle valve 84 which is connected in the main pressure line 68 and is further connected by a transparent plastic tube 85 to the line 85 leading from the feed valve 12 to the sump 82.

The grinding wheel head and its power mechanism is constructed as follows. The slide 1 is mounted on four rollers 81, Fig. 7, and is further provided with side rollers 88, Fig. '1, to reduce friction, and is actuated in sliding movement by the piston rod |33 of an hydraulic cylinder 89 which is controlled selectively by manually controlled four-way valve 9| that is actuated by a handle 92, or by automatic valve 35 subsequently described and explained. The valve 9| is connected by a pressure conduit 93 to a pump 94, Fig. 14, and is provided with a needle valve 95 for bleeding out any air that may be pumped into line 93.

The grinder head in which the grinding wheel is journaled is shown in detail in Fig. 9 of the drawing. The grinding wheel 8 is rotated by a spindle 96 journaled at one end in ball bearings CII Sland at its other end in a triple row staggered roller bearing 98. The inner race of bearing 98 is seated on a conical or tapered portion of the spindle 96 on which it is held by a sleeve |00 and a lock nut |0|. With the bearings 91 abutting the spindle shoulder |02 on one side and the ring nut I02a on the other, the spindle is locked against axial displacement. Bearings 91 maybe pressed off spindle 9B by a sleeve |03 against which the nut |0| acts when turned on the threaded portion |04 of the spindle.

The grinding wheel collet or mount is made of three parts, a hub |05 and wheel flanges |06 and |01 between which the abrasive wheel 8 is clamped by bolts |08. The end of spindle 96 is tapered as shown at |09, behind which the spindle is provided with -a square thread ||0 on which the wheel flange portion |01 is screwed. The wheel ange portion |01 is also provided with countersunk cap bolts ||I, with which the hub |05 is securely attached thereto.

The outer race I !2 of the triple staggered roller bearing 98 is inserted in sleeve H3 to which it is bolted. Sleeve I3 is 4held in wheel slide 1 by nut H4, and one end of the bearings 91 is held in place 'by nut H5. A second sleeve l I3 is held in slide 1 by nuts H1 and H8, in which is pressed the outer races of ball bearings 9,1, held by retainer IIB threaded into sleeve I6. The mounting of the abrasive wheel 8 permits grinding closer, and the triple roller bearings 98 at the grinding wheel end of the spindle, due to the out of line of lthe rollers by staggering, gives a smoothness to the spindle and grinding wheel not attainable by ball bearings, and the cause of chattering or vibration on the work is eliminated. The spindle is driven by a pulley or sheave wheel drive as previously described which is keyed on the tapered end of shaft 95 at Ila and the grinding wheel hub |05 is keyed on taper 'seat at the other end of shaft 96 at |0511.

The wheel slide 1 is provided with a screw feed H9 which is provided with a bearing 20 at one end that is bolted to the machine bed I, and a second bearing |2| that is also bolted to the machine bed Screw ||9 is provided with square cut threads |22 that interact with the thread of a shoulder sleeve |23 having a key-way |24. An adjusting vscrew |25 keeps the feed screw ||9 tight against ball thrust bearing |29. Screw I|9 is provided with a gear wheel 21 that interacts with a pinion |28 rotatable 'by a hand wheel |29 to afford micrometer adjustment of the screw H9. Sleeve |23 is a sliding nt in sleeve 30 held in bracket |3I. A key |32 anchored in the bracket sleeve |30 prevents shoulder sleeve |23 from turning when screw H9 is rotated 'to permit motion of the wheel slide 1 towards the work by action of cylinder 39 as shown in Fig. l0. The shoulder |32 is a stop for the wheel slide or rather the bracket I3| which is bolted to the wheel slide 1. This feed screw is not used to retract the grinding wheel, which is eiected simply by reversing cylinder 89 by operation of valve 9|.

The cylinder 89 for actuating the wheel slide hydraulically is bolted to the bed I of the machine and its piston rod |33 is connected to bracket |3| by the screw |3311, Fig. l0, so, that when hydraulic pressure is applied to cylinder $39 the pressure on the piston head |34 displaces bracket |31, carrying with it the wheel slide 1 to feed the grinding wheel 3 into the Work. The adjusting and actuating mechanism is securely held against any other displacement movement except that of eeding the wheel to the work.

against the shoulder or flange of .the-screw sleeve |23. lf the screw feed ||9 is not adjustedand the wheel slide is reversed 'by the pressure inV cylinder 89 only, then upon the reversal of pressure which brings slide |3| against the shoulder stop |23, the wheel is again in the same grinding position that itrwas before reversal.

The grinder head slide 1 may also be automatically fed while the work table is moving back and forth on the machine bed by means of an au'- tomatic valve, generally vdesignated by the ref-V erence character |35, shown in Figs. 2 to 5 inclusive. The automatic feed is used for grinding crowns, concavities or tapered surfaces on the roll body and shoulders, for which purpose a bar |36, Fig. l, is employed. It is mounted by bracketsA |31 and |66' mounted on the table 3. The ends of the bar |36 may be adjusted by micrometer screws |39 and |49,.and the center of the bar is pivotally mounted at |4| on a bracket. as shown, which is secured to the table 3. A contour bar |42, which normally is straight, is mounted on the 'bar |36. It is attached to the bar |36 by brackets |43 and |44,.shown in detail toV the left at the rbottom of Fig.kl, and is provided with an eccentric k|45 carried by a bracket |46 bolted to bar |36 as shown in the centerv at the bottom of Fig. l, the eccentric |45 being adjustable to bow the bar |42 where it is desired to grind a crown |41 on the face o f the roll as shown in Fig. 1 in a manner to be hereinafter explained. The automatic Valve |35 is controlled to feed the grinder wheel slide 1 to form the crown on the roll by a follower |48 which, as shown in Fig. 3, is mounted on a lever |49 pivoted at |50 to the valve base. The follower 48 rides against the bar |42 as shown in Fig. l. a slide bar that is connected to the slide 1 by a bracket |52 asfshown in Fig. l, so that the Valve moves transversely ofthe table 3 and synchronously with the grinder head -1 in response to actuation of cylinder 89 which the valve controls. For the purpose of adjusting the grinding wheel head to the work or tafble the bar |5| may be clamped to the bed by yoke clamp |5|a as shown in Fig. 2. The bed 1 may then be moved by sliding contact with bar |5| without disturbing valve |35.

One end of the bracket is connected to an arm |53, Fig. 5, of the valve base |54. The base |54 is adjustable by a micrometer feed screw |55 operated by hand wheel |56 to move the wheel slide in the direction of the roll to bring the wheel 8 in contact with the roll preliminary to the automatic feeding as effected by the valve |35 in the following manner. 3, is biased by a spring |51 which is connected to a stud |58 screwed into base |54 of the valve;the

' spring being absent in Fig. 5.

of the plunger |59. A special rubber packing cupv |64 is fastened underneath the plunger shoulder |63 by a screw |65. Av small reservoir |66 'is' pro- Y vided below the plunger which is lled with liquidV through the opening closed by a small screw |61.

f Cylinder |60 has an extended sleeve |68 in which The valve lever |49,Fig.`

The Valve is carried upon Aisjin'vsert'edV a piston rod |69, vapacking cup |18 being provided in the endof the extension sleeve v I68. A spring cage |1| is screwed on theA piston rod |69, the cage being biased by a coil spring |12 that rests against a flange of the cageV and the other end rests upon va spring seat |13. Ihe 'action of spring |12 is to maintain pressure on the liquid in the reservoir |66. y

The piston rod |69 pushes against aspo'ol v alve |14 which is controlled by a spring |15 resting on body fiange |16. Spring |15 keeps pressure on the spool valve |14 and on the'piston |69 and against the iiuidin the chamber |66, whereby pressure is maintained against plunger |59 and lever |49, but not enough to stretchor move spring |51.

The spool'yalve controls port holes ,|11and |18 which, as shown in Fig. 14, are connected to the lower end of the wheel slide cylinder 89 vandthe pressure side of pump 94 through conduits |19, a needle valve |88 being provided in the line and a relief Valve |8| having a drain |82 to the sump l82. Port holes |83 and |84 are connected to the top and bottom of the cylinder 89 for the return flow of the fluid to the reservoir or sump through port holes |85 and |86. These connections are so made to expel any trapped air in the cylinder 89 when all port holes arecovered bythe spoolk valve |14,v and the fluid is not passing to either end of the cylinder. The spool shape of the valve |14 provides a pressure balance on all sides of the valve so that it is responsive only tothe pressure vof the fluid acting through the respective ports of the valve.V In other words, no power is lost or movement in the valve'housing.

required in subjecting the spool valveto axial So long as the control valve is closed (i. e., follower |48 and lever |49 are not disturbed or moved relative to the Valve body) the grinding wheelslideto which it is connected by the slide bar |5| remains stationary or in a xed position,

and it will remain so as long as the contour bar |42 is parallel tothe table travel. i

When the bar |42 is set for tapering or crowning, roller |48 as it follows the bar will displace lever,v |49 to presson plunger |59 which in turn exerts pressure on the uid in reservoir 66, forcing the liquid to expand into the cylinder sleeve` brings the control valve back in balance. The

shape of the contour bar will thus permit a small amount of pressure fluid to be fed to thecylinder ually controlled by pushing in or pulling out the slide |31.

When valve ,|14 is closed oil is trapped'in the cylinder 89 on both sides of the fpiston,v and the grinder slide 1 is rigidly held against displacevment in either direction. Movementof the lever |49 opens the ports to both sides of the piston,one

to pressure and the other to the reservoir, to va degree proportional tothe lever movement but `pair accuracy of control.

`rapidly as closed position is approached inhibits momentum elects and delay in equalizing pressure on both sides of the piston which would im- Thus as shown in Fig. 14, the grinder Wheel slide 'l may be hydraulically actuated either by the automatic control valve |35 or by lever 92 through valve 9| which is connected by conduits |88 and |89 to the top and bottom of the cylinder 89, which for clarity is shown in Fig. 14 of the drawings as connected both to the automatic control and manual hydraulic controls.

The reservoir |66 functions as sensitizing means in the valve by which small or iniinitesimal displacements of the plunger |59 (resulting from corresponding small displacements of lever |49 and roller |48) is translated as large or substantial displacements of the valve operating piston |69. This result is due to the relative areas of the large actuating plunger |59 and small actuated piston |59 'and the constant volume of displacement transmitting oil reservoir |56. As an increment of this oil is transferred from cylinder |69 to the small diameter extension |68 the lineal` displacements of the piston and plunger 4are not only proportional to the magnitude of the increment of oil transferred, but the valve motion is intensified in the ratio of areas of the moving parts and is therefore sensitive to minute and practically innitesimal reactions between the roller |48 and contour bar |42.

With reference to Fig. 14 of the drawings, the head stock is driven by an hydraulic motorA |2 connected to a four-way valve cylinder |9| having a spool valve |92 operated by a lever |93. The

valve |9| is connected by a conduit |94 to a pump |95 having a relief valve |96 to regulate the pressure of the fluid independently of the pressure at the pump.

Theways 22 of the bed on which table 3 slides are lubricated by providing a reservoir |98 for oil in the bed of the machine as shown in Fig. 2. This is covered by a pan |99 to keep Aout dust. The cover is provided with a slot a little longer than the travel of the table 3 and a suction pipe 200 is attached to the table extending through the slot into the reservoir |98. At the head stock end of the table is a small motor and pump 20|, the suction side of the pump being connected to the pipe 209 and the outlet side of the pump being connected to pipes 292 and 2 03 which lead to the center of the table ways 22 to supply lubrication. This gives uniform pressure of lubrication throughout the table travel and permits the oil to be returned through holes provided in the ways to the sump without further piping. The ways also are further provided with pockets 204 that are filled with Babbitt or plastic to catch any grit that may accumulate in the ways to prevent it from scratching the surface of the ways.

vtail stock center all as shown in Fig. 1, the work is set up for grinding by the wheel 8.

The wheel slide 'l is initially moved adjacent the roll surface by the hand wheel |29 which moves the slide. The grinder wheel motor 9, Figs. 7 and 11, is then energized to actuate the grinder wheel 9. The start and stop valve T5, Fig. 14, is then actuated to direct pressure fluid to the table cylinder 23, Fig. 14. Stops 19 and '19 for valve 16 are then set to limit the length of travel of the table 3 to the distance correspending to the surface on the roll I9 to be ground. Valve 12 is then adjusted to regulate the return of travel of the table back and forth and the wheel is then fed either by the hand wheel adjustment, as shown in Fig. l0, where the surface of the roll or shoulder is straight, or if crowned as shown in Fig. l of the drawing the automatic regulator valve |35 is brought into action by adjusting roller |48 to contact the surface of the contour bar |42. If the bar |42 is bulged in the center by an adjustment of the eccentric |45, Fig. 1, the travel of roller |48 on the contour bar will result in a feeding of the wheel 8 through the slide 'I corresponding to the contour of the bar, resulting in a crowned surface |41. If the contour bar |42 is merely thrown at an angle without bulging in the center, or tilted, so to speak, the resulting action of the roller |48 following the contour bar will produce a taper such as shown at 5T, Fig. l of the drawings, which is the journal neck of the roll.` The roll is actuated to rotate through the hydraulic motor |2 by operating lever |93 that controls the valve |9|.

For speedy travel of the grinder wheel slide 'l to and away from the work, such as when the roll is removed and a new roll placed on the table, the cylinder 89 is connected to the pressure fluid by manipulating lever 92 which through valve 9| directs the iluid to move the slide head either direction as desired.

The feed screw |9 for the grinding wheel slide with the sleeve and stop shoulder |23 acting to stop Ythe slide with the hydraulic cylinder 89 pushing the Wheel slide against the stop, any movement except to feed the wheel to the Work is eliminated. There is no back lash in the screw and nut and no wear. n 'Ihe lubrication of the table ways on the bed 1s another desirable and important feature as it maintains equal pressure of the lubricant on all points of the table for the full length of travel ofY the table. It eliminates piping, and supply of oil in unequal pressures resulting in a smoother gr1nding operation, and prevents scoring of the ways of the table and bed.

The staggered roller bearing 99 for the grinder head, as shown in Fig. 9 of the drawings, produces a smoothness to the spindle operation not obtained by ball bearings or rollers that are in line instead 0f staggered. It produces a smooth finish on the Work and permits deeper feeding into the work, thereby reducingtime for the grinding operation.

Another important feature is the table operating cylinder with the composite piston head holding leather packing cups and the manner in which it operates to delay action to allow the work to make a revolution before the table reverses. The adjustable stops on the bed permit of grinding against the shoulders and collars of the work and eliminate the need for a rack on the table. The hydraulic actuators and controls all within the reach of the operator at the front of the table allow for speedy adjustment and accurate control of the roll grinding operation. While the invention has been demonstrated as applicable to grinding of rolling mill rolls, it isevident that it may be used for any kind of grinding operations and especially for large industrial parts.

Although one embodiment of the invention has been herein illustrated and described, it will be evident to those skilled in the art that various modifications may be made in the details of construction without departing from the principles herein set forth.

I claim:

1. In a roll grinding machine, a bed having ways for receiving a table, a table mounted for sliding movement on said ways, an hydraulic cylinder mounted on said table parallel to said ways, a floating piston in said cylinder, hollow piston rods comprising iluid conduits extending through both ends of said cylinder connecting to said piston, fluid ports in said piston communicating with the ends of said conduits respectively on opposite sides of said piston, guide means on said bed for said rods permitting longitudinal movement of said rods therein, and stop means on said rods adapted to engage said guide means after limited displacement of said rod in both directions, and reversible valve means for selectively admitting iiuid to said cylinder under pressure through one conduit and withdrawing fluid through said other conduit to cause said table to reciprocate along said ways, the said, limited displacement of said rods and piston providing a predetermined interval upon reversal of said valve during which the table remains stationary while the rods and piston move to rest against said stop means.

2. In a roll grinding machine constructed according to claim 1, a headstock and tail stock for receiving and turning work to be ground mounted on said table, means for driving said headstock continuously, a grinding wheel adjacent said table at a station iiXed longitudinally of said ways, valve reversing fingers adjustably mounted on said table and adapted to engage and operate said reversible valve means when the table is in extreme positions with the ends of the pass on the work at said station, and the said stop means. on said rods being mounted to provide one revolution at least of the continuously rotated work at said extreme positions while the table is stationary to complete grinding a full circumference at said extreme positions before reversal of said table.

3, In a roll grinding machine, a machine bed having ways for reaching a table, a table mounted for sliding movement on said ways, hydraulic actuating mechanism for operating said table comprising an hydraulic cylinder mounted on said table, a piston operative in said cylinder, a source of pressure iiuid for said cylinder and valve means for directing the uid to opposite sides of said piston, said piston comprising a plurality of piston heads, a screw sleeve joining the ends of said heads, hollow piston rods connected to said heads, said heads having uid chambers communicating with said piston rods and having iiow passages from said chambers, cup leathers disposed between said heads for providing fluid seals with the wall of the cylinder, and packing glands between the cylinder heads and piston rods externally of the cylinder.

4. In a roll grinding machine, a machine bed, a table mounted for sliding movement on said bed, a slide for supporting a grinder wheel head extending transversely of the path of movement of the table, a grinder head mounted on said slide carrying a grinding wheel, pressure iiuid means for moving said head to and away from said table, a valve for controlling the application of pressure fluid for actuating said grinder wheel head, a templet mounted on the table, means for adjusting the contact surface oi the ternpletl to the desired contour of the roll to be ground, means engaging said templet for operating said Valve in response to movement of said table, said valve comprising a valve housing, a spool valve in said housing, ports controlled by said spool valve connected to a source of pressure iiuid and to a sump, spring means normally biasing said spool valve to one position of its travel, fluid pressure means counteracting said spring means, and a lever for regulating the pressure on said iiuid pressure means, said lever being biased by a spring relative to its fulcrum point and a follower mounted on said lever for engaging the templet of the table to eiect movement of the spool Valve and for directing pressure iluid to and from the operating cylinder oi the grinder wheel head in response to movement of the table.

5. In an hydraulic roll grinder including a work carrying table reciprocable longitudinally and a grinder carriage movable transversely of said table at a station therealong and a bed having longitudinal and transverse ways for said table and carriage respectively, an hydraulic cylinder mounted in said bed connected to propel said carriage, a templet adjustably mounted on said bed parallel to the path of said carriage, a control valve for said cylinder, mounting means supporting said valve adjacent said templet from said carriage, said means being frictionally held by said carriage, a clamp mounted on said bed adapted to engage and hold said mounting means in xed relation to said templet and to permit said carriage to slide with respect to said mounting means, the valve and said mounting means being free to move in correspondence with movement of said carriage when said clamp is released, whereby by operating said clamp the carriage may be independently indexed to grind the work at a predetermined depth, and after release of said clamp the contour and depth of grinding as controlled by interaction of said valve and templet.

BERT A. WILSON.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 957,978 Meyers I May 17, 1910 1,419,073 Norton June 6, 1922 1,633,557 Morgan June 21, 1927 1,953,029 Smith Mar. 27, 1934 2,079,720 Shaw May 11, 1937 2,132,941 Flygare i Oct. 11, 1938 2,164,518 I-Iart July 4, 1939 2,246,476 Wood et al. June 17, 1941 2,276,260 Turrettini Mar. 10, 1942 2,294,872 Wood Sept. 1, 1942 2,397,178 Wiken et al. 2 Mar. 26, 1946 2,411,391 Robaczynski Nov. 19, 1946 2,436,373 Barnes Feb. 24, 1948 2,475,791 Lesueur July 12, 1949 FOREIGN PATENTS Number Country Date 209,696 Switzerland Apr. 30, 1940

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