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US3033187A - Wheel wear sensing device and compensator - Google Patents

Wheel wear sensing device and compensator Download PDF

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US3033187A
US3033187A US9539961A US3033187A US 3033187 A US3033187 A US 3033187A US 9539961 A US9539961 A US 9539961A US 3033187 A US3033187 A US 3033187A
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wheel
grinding
means
work
end
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George E Wespi
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Saint-Gobain Abrasives Inc
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Saint-Gobain Abrasives Inc
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/18Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the presence of dressing tools

Description

May 8, 1962 G. E. wEsPl WHEEL WEAR SENSING DEVICE AND COMPENSATOR Filed Mrch 13, 1961 2 Sheets-Sheet 1 May 8, 1962 G. E. wEsPl 3,033,187

WHEEL WEAR SENSING DEVICE AND COMPENSATOR Filed March 13, 1961 2 Sheets-Sheet 2 AMPL/F/E CRYSTAL 'FICK P I VENTOR .GEUHGE E. WEE/Ill ATTO ENEY 3,933,187 WHEEL WEAR SENSNG DEVICE AND CMPENSATOR George E. Wespi, Lyons, lli., assigner to Norton Company, Worcester', Mass., a curporation of Massachusetts Filed Mar. 13, 196i, Ser. No. 95,399 l2 Claims. (Cl. iid-11) rThis invention relates to grinding apparatus of the kind in which a grinding wheel is arranged to be moved toward a work support a predetermined amount to grind a work piece mounted on the work support to size, and, in particular, to machines of the kind shown in Patent No. 2,894,360 issued to Charles C. Alvord on July l4, 1959, in which reference may be had to details disclosed therein.

IIn machines of the foregoing kind, it is customary to dress the face of the grinding wheel periodically, either manually or automatically, by predetermined amounts to maintain the wheel true, and hence to insure accuracy in the grinding operation. However, dressing the wheel reduces its radius so that the finished Work will be oversize by the amount removed from the radius of the wheel, if the Wheel is advanced toward the Work by the wheel feed mechanism from the same starting point and through the same distance that the wheel was advanced by the wheel feed mechanism prior to the dressing operation. For this reason, it has been customary to provide a compensating mechanism responsive to the operation of means for dressing the wheel and effective to adjust the wheel feed mechanism by a predetermined fixed amount calculated to offset the reduction in the wheel radius resulting from the dressing operation.

Under favorable circumstances when such a compensating mechanism is properly adjusted such an arrangement tends to minimize deviations in the finished size of successive work pieces from the finished size prescribed for such work pieces. However, since successive reductions in the radius of the grinding wheel may not in fact be uniform over an extended period due to the intervention of other modifying factors, there is no positive assurance that such compensation will remain effective over extended periods without occasional supplemental manual adjustment of the Wheel feed mechanism.

The ultimate requirement for grinding successive work pieces to a uniform prescribed size is simply that the periphery of the grinding wheel come to rest at the end of each feeding cycle at the same predetermined distance from the axis upon which the successive work pieces are supported for the grinding operation, notwithstanding the intervention of wheel size modifying factors such as wheel wear, dressing operations, and dressing tool wear.

Accordingly, the present invention contemplates an arrangement for precise direct measurement of the radius of the grinding wheel operable to adjust the wheel feeding mechanism so that the ultimate position of the surface of the grinding wheel during a grinding operation coincides with the predetermined precise location in which the grinding wheel will produce uniformly sized successive work pieces to the desired finished dimension. The device comprising the instant invention is further characterized by the fact that it automatically compensates for the net effect of the various different factors tending to adversely effect the final sizing of a succession of work pieces finished on a given grinding machine.

An object of this invention is the provision of automatic compensating means for the wheel feeding mechanism of a grinding machine controlled by a sensing element arranged for displacement into direct engagement with the surface of a grinding wheel after a truing operation thereon, and actuating means therefor coupled with the truing apparatus for coordinated operation therewith.

Another object of this invention is to provide a means CAD Patented May 8, 1962 for periodically adjusting the Wheel feeding mechanism of a grinding machine to compensate for the net change in the size of the grinding wheel since the preceding compensation of the wheel feeding mechanism.

Still another object is the provision of automatic compensating means for the Wheel feeding mechanism of a grinding machine including means for advancing a sensing element toward the surface of the grinding wheel and means for advancing the grinding wheel toward a Work piece concurrently through the same distance until these means are inactivated simultaneously by engagement of the sensing element with the surface of the grinding wheel. v

A further object of this invention is the provision of an automatic compensating means for the wheel feeding mechanism of a grinding machine operable periodically to adjust the setting of the wheel feeding mechanism to compensate for the net change in wheel size including a direct sensing element normally disposed a predetermined short distance from the surface of the grinding wheel,

initially advanced toward the surface of the grindingY wheel said predetermined distance prior to a compensating operation, and retracted from the surface of the grinding wheel said predetermined distance upon completion of a compensating operation.

As herein illustrated, there is a relatively fixed work support, a grinding wheel, and a grinding wheel slide supporting the grinding wheel rotatably thereon for movement therewith toward the work support to feed the wheel toward the work. In accordance with the invention, there is a wheel dressing tool mounted for movement transversely of the face of the grinding wheel and back through a cycle for dressing the face of the wheel, a stylus adjacent the face of the wheel, means for initially positioning F the stylus and grinding wheel slide predetermined coordinated distances from the face of the wheel and the work support respectively, means operable at the end of each cycle of operation of the dressing tool to advance the stylus a predetermined amount and then to effect concurrent movement of the stylus and the wheel slide equal distances toward the wheel and Work support respectively, and means operable when the stylus touches the wheel to render the last-named means inoperable and then to retract the stylus the same predetermined amount. A crossslide supports the dressing tool for reciprocable movement relative to the face of the wheel and there is means on the cross-slide operable, as the slide nears the end of a cycle of operation, to initiate operation of the means for advancing the stylus and wheel slide toward the wheelk and work support respectively. The means for advancing the stylus and wheel slide includes fiuid operated motors, one of which is actuated to advance the stylus toward the wheel by the amount of the previous retraction and the others of which are operable to advance the stylus and the slide simultaneously equal amounts.

The invention will now be described in greater detail with reference to the accompanying drawings wherein:

FIG. l is a fragmentary side elevation partly in section of a grinding apparatus showing a work support, a grinding wheel, a screw for advancing the wheel toward the work support, a dressing tool, and compensator mechanism including a sensing device;

FIG. 2 is a section on a larger scale taken on the line 2 2 of FIG. l;

FIG. 3 is a section taken on the line 3 3 of FIG. 1;'

Referring to the drawings, the machine has a rigid base on which there are spaced parallel, horizontally disposed ways 12, which support a grinding wheel 14 and wheel slide 16 for movement toward and away from a work supporting table 1S, the latter being mounted for movement transversely of the face of the grinding wheel on V-shaped and flat Ways 20 and 22 on the base 10. The wheel slide 16 has a half nut 26 secured to its underside and threadably engaged with a feed screw 24 journaled in the base for axial and rotational movement to advance the slide 16 toward the work support. For rapid feed the rear end of 4the feed screw 24 is journaled in a bearing slide 11 which is operably connected to a fluid motor 13, whereby the feed screw may be advanced bodily axially thereof without rotation to move the wheel slide 16 up to the work support. For slow feed the forward end of the feed screw 24 has an Unthreaded portion which is slidably keyed in the rear end of a sleeve 15, the latter being rotatably supported on the base 16. A spindle 17 is slidably keyed at its rear end in the forward end of the sleeve 15 and extends forwardly therefrom beneath the work support into a gear housing 19. A drive gear 21 is keyed to the forward end of the spindle and affords means by which the feed screw 24- may be automatically or manually rotated. Automatic rotation of the feed screw is effected through a pair of gears 23 and 25, one of which meshes with the drive gear 21, and the other of which meshes with a rack 27. The rack 27 is formed on one side of a piston 29 situated in a cylinder 31. By supplying pressure fluid to one end of the cylinder 31 the rack may be moved in a direction to advance the wheel slide. For manual feed the gear 23 is disengaged from the drive gear 21 and rotation is imparted to the latter by a gear 33 which meshes therewith. The gear 33 is keyed to a shaft 3S journaled in the gear housing 19 and the shaft 35 has fixed to it an index gear 39 that meshes with a pinion of a well known micrometer adjusting means supported on a hand wheel 37 rotatable on the end of the shaft 35. This micrometer adjusting means arranged to cooperate with an adjustable stop for controlling the work size may conveniently correspond to the micrometer adjusting device described and illustrated in Patent No. 2,572,529 issued to H. A. Silven on October 23, 1951. In this Silven patent, particular reference may be had to the description beginning in column 19 and to the showing in FIGS. 9 and l0.

A motor M is mounted on the wheel slide and belts 32 entrained about pulleys 28 and 30 on the motor shaft and wheel shaft respectively, provide for driving the grinding wheel.

At the top of the Wheel guard 34 there is a horizontal opening 36 around which is formed a support 38 for a dressing tool 46 which projects downwardly through the opening, as shown in FIG. 6, close to the surface of the grinding wheel 14. The dressing tool 4S is xed to the lower end of a spindle 42 which is vertically adjustable in a sleeve 44 mounted between pairs of guides 45 on a slide 46. The slide 46 has a dove-tail recess engaged with a dove-tailed projection from a rail 48 supported by a bracket 50 in a horizontal position crosswise of the grinding wheel, that is, parallel to its axis of rotation. A hand wheel 54 and gearing S6 provide means for adjusting the tool 4t, heightwise and a pin 53, engageable with one of the gears 56, provides means for fixing the tool 4t) at a predetermined heightwise position. A knife edge follower 47, also fixed to the sleeve 64, and bearing on a form bar 49, guides the tool 4t? as it moves transversely of the face of the grinding wheel.

With the dressing tool adjusted before each cycle to the desired position either automatically or manually for removing a predetermined amount from the face of the wheel, movement back. and forth across the face of the wheel is effected by reciprocation of the slide 46 and to this end the latter is connected by a rod 62 to a piston 64, situated in a uid motor` cylinder 66. The cylinder 66 is mounted on or formed integrally with the rail 48. Pressure fluid is supplied to the opposite ends of the fluid motor cylinder 66 and vented therefrom by way of a valve V1 to which uid is supplied from a reservoir 68, through a conduit C1, and exhaust fluid is returned to the reservoir from valve V1 by way of a conduit C2. When the valve V1 is shifted to the left, fluid is supplied to the left end of the fluid motor cylinder 66 and, when it is shifted to the right, fluid is supplied to the right end of the fluid motor cylinder 66. The slide 46 is reciprocated from left to right and back during one cycle of operation, to dress the face of the wheel and, as will appear hereinafter, this reciprocation may be effected automatically or manually.

Each time the face of the grinding Wheel is dressed its diameter is made smaller hence it is evident that if the machine has been set to feed the slide forwardly a predetermined amount to grind the work to a specified dimension, unless provision is made for compensating for the modifying factors tending to change diameter of the wheel, the dimension ultimately ground will not be the predetermined required size. To rectify this, a sensing device 70 (FIG. 1) is mounted adjacent the grinding wheel for detecting directly the net change in wheel radius. This sensing device 70 is operable through control of a compensator 71 to move the grinding wheel forwardly toward the work support by exactly the same radial amount that is removed from the surface of the grinding wheel. The sensing device 70 is mounted on the wheel guard 34, rearwardly of the dressing tool, over a suitable opening formed in the wheel guard, and includes a stylus 72 (FIGS. 2 and ll), which is adapted to be moved toward the surface of the grinding wheel 14, following each dressing operation, by means which will be described hereinafter. The compensator device 71 incorporated in the lead screw slow feeding mechanism moves the wheel slide toward the work support including work table 18 a corresponding amount by rotating the screw, independently of the automatic and manual means for feeding the wheel slide. When the stylus contacts the grinding wheel it actuates a circuit controlling means operable to terminate rotation of the lead screw and hence forward movement of the wheel slide, and also operable to retract the stylus by a predetermined amount so that it will not be damaged.

The stylus 72 is supported within a bushing 76 in turn yieldably supported within the exposed end of sleeve 74 (FIG. 2) by a threaded collar 73 screwed into the end of the sleeve 74. As illustrated in FIG. 2, the bushing 76 is normally biased into fixed relation to the threaded collar 78 by a combination of elements including a flange projecting from the bushing 76 and a biasing spring compressed between one face of the flange and one side Wall of a hollow annular retainer the other side wall of which is disposed between and engaged by the other face of the flange on bushing 76 and the inner surface of the threaded collar 78. Thus, the stylus 72 is normally maintained by the biasing spring in fixed axial relation to the sleeve 74, but it may be displaced to minimize damage to the stylus in the event the sleeve 74 is advanced too far toward the surface of the grinding wheel.

The sleeve 74 is mounted on a lead screw 30, being supported near one end by a ball bearing assembly 82, and at the other end by a threaded nut 84 secured against rotation relative to sleeve 74 by the screw 85 so that rotation of the screw effects movement of the sleeve axially of the screw. The sleeve and screw are enclosed within a housing 86 having a ange 88 at one end, by means of which it is bolted to the wheel guard 34, and a flange at the other end to which is bolted a head casting 90 containing a thrust bearing retainer 92 and ball bearing assemblies 94 which support the lead screw 80 at that end of the housing. At the end of the housing adjoining the exposed end of sleeve 74 there is a bellowstype diaphragm 96 extending between the lower extremity of the sleeve and the housing to exclude dust. The diaphragm 96 may conveniently serve also as the means of preventing rotation of sleeve 74 relative to housing 86 when lead screw 80 is rotated.

The actuating means for the sensing device 70 includes two coacting portions. The portion described first below s that which functions to advance the stylus by a predetermined amount in preparation for a grinding Wheel size sensing operation and to retract the stylus from the face of a grinding wheel after such a sensing operation. The other portion described thereafter is that which functions to advance the stylus further toward the wheel until it engages the surface of the wheel. A worm wheel 98 is fastened to the right end of the lead screw 80 and this meshes with a worm 100 on a shaft 102 in the head casting 90. One end of the shaft 102 is journaled in a ball bearing assembly 104 (FIG. 3) and the other end is rotatably supported in a sleeve bearing 106, the latter constituting an end wall of a cylinder 108 within which there is situated a piston 110. The left-hand end of the shaft 102, beyond the bearing 106, has a collar 112 fixed thereto and between this collar and the left-hand side of the bearing 106 there is a coiled spring 114, the effect of which is to hold the shaft 102 and the piston 110 engaged thereby displaced toward the left as viewed in FIG. 3, but which will permit the shaft to be moved axially toward the right. In the absence of fluid pressure within the cylinder 108 at the left side of the piston 110, the spring 114 operates to retract the stylus from the face of the grinding wheel by a predetermined amount, for example, 0.01.

The shaft 102 has splined on it a clutch disc 116 (FIG. 6) on which there is mounted an externally toothed clutch ring 118, the latter meshing with a rack 120 on one side of a piston 122 disposed in a cylinder 124 which forms a part of the head casting 90. The clutch disc 116 and ring 118 and the spring biased rollers therebetween constitute a one-way clutch. A spring 126 holds the piston at one end of the cylinder. However, by supplying oil to that end of the cylinder, the piston may be moved toward the opposite end and, by such movement, rotate the ring 118 in a clockwise direction as seen in FIG. 6. Clockwise rotation of the ring 118 imparts a corresponding clockwise rotation to the disc 116 and hence to the worm 100 so as to turn the worm wheel 98 in the direction of the arrow shown in FIG. 6 and thus to advance the sleeve 74 and hence the stylus 72 toward the wheel 14. When the cylinder 124 is vented, the one-way clutch allows the spring 126 to return the piston 122 to its initial position without reversing rotation of the worm.

The compensator device 71 for advancing the grinding wheel at the end of each dressing operation to make up for the loss in radius of the wheel as illustrated and described herein is the same as the corresponding portion of Patent No. 2,894,360 referred to above, to which reference may be had for further information regarding this device. As previously mentioned, the compensator device 71 is controlled by the sensing stylus 72 and consists of a hollow piston rod 132 (FIG. 6), the left end of which is slidably disposed in an axial chamber 134 at the right end as seen in FIG. l of the spindle 17, the latter being supported at its forward end by a pair of ball bearing assemblies 142 in the gear housing 19 supported by the base 10.

The right-hand end of the hollow piston rod 132 has on its outer surface a rack 148 which meshes with a gear 150 (FIGS. 1 and 6), so that movement of the piston rod 132 to the right effects counter-clockwise rotation of the gear 150. The gear 150 rotates a stub shaft 152 on which there is a gear 154 which meshes with a gear ring 156 (FIGS. 4 and 6), surrounding a disc 157 secured to a worm shaft 158. Spring biased rollers 159 situated in notches between the disk and ring provide a one way clutch for driving the Worm shaft 158 clockwise when the gear ring 156 is driven in a clockwise direction, as shown in FIG. 5. A similar one way clutch is provided at the other end of the shaft 158 to prevent reverse rotation of the worm 161 mounted on shaft 158 when the gear 156 is freely rotated counter-clockwise by the movement of the piston 132 to the left. The worm 161 fixedly secured to worm shaft 158 meshes with a worm wheel 160 keyed to the spindle 17 and so is operable to effect rotation of the spindle independently of the hydraulically actuated rack 27 or the hand wheel 37 and, by such rotation, to affect movement of the wheel slide forwardly toward the work support.

The hollow piston rod 132 has in its open end a slidably disposed pin 128, the inner end of which is engaged with a compression spring 135. A screw 130, threaded into the gear housing 19 in turn supported by the base 10, engages the outer end of the pin 128 and thereby constrains pin 128 against displacement to the right as seen in FIG. 6. Thus, pin 12S in cooperation with spring 135 returns piston rod 132 to the left end of the cylinder when the pressure is vented from that end of the cylinder.

Referring to FIG. 6, for the operation of the machine, the oil for -the system is supplied thereto from the reservoir 68 by a motor driven pump 162 of conventional design by way of the conductor C1 and is returned through a conductor C2, there being a relief valve V adjacent the discharge side of the pump for by-passing oil from the conductor C1 directly to the conductor C2 so that the pressure within the system may be maintained at the desired constant level. Energy is supplied to the pump motor through a switch SW4 when the main switch SW1, connecting the electrical system to the power line L1 has been closed. A motor M drives the grinding wheel 14,

as previously indicated, and this motor is energized by closing a switch SW2.

Reciprocation of the dressing tool 40 is effected by supplying oil first to one end and then the other of the cylinder 66. The slide 46 moves from left to right and back for each cycle of operation and normally occupies a position of rest at the left-hand side, as shown in FIG. 6. When the slide is in the left-hand position it contacts a springpressed plunger 164 which holds a normally open switch LS3 at that side closed. At the same time, a normally closed switch LS2 at the opposite side is held closed by a spring-pressed plunger 166. When the slide is in the lefthand position, if the main switch SW1 is closed, continuous reciprocation of the dressing tool may be initiated by closing a switch SW3 which allows current to flow to relay CRL Energization of relay CR1 operates to shift switch ICR to the left, thus energizing solenoid S1. Relay CRI is held energized through the normally closed switch L82. Solenoid S1 shifts a spool in the valve V1 to the left, thus permitting oil to ow through it to the left end of the cylinder 66 and at the same time vents oil from the right end. Consequently, the piston 64 moves to the right. When the slide 46 moves from left to right it first opens switch LS3 by releasing the plunger 164, but relay CRI remains energized by means of the holding circuit therefor through normally closed switch L52. As slide 46 approaches the right-hand end of its stroke, it `opens switch L82 by engagement with the plunger 1.66, thereby deenergizing relay CRI, opening switch 1CR and de-energizing solenoid S1. De-energization of solenoid S1 allows the valve spool in the valve V1 to be shifted to the right, thereby allowing oil to flow to the right-hand end of the cylinder 66 and to exhaust from the left-hand end so as to return the slide 46 to the left-hand position. As the slide 46 approaches its left-hand position, it once again engages the plunger 64- and thereby closes switch LS3 to reestablish the circuit by means of which relay CRI is energized to initiate another cycle of operation. Thus, slide 46 continues to reciprocate back and forth so long as switch SW3 remains closed.

In order to effect a single cycle of operation of the dressing tool 40, the starting push button PBI may be depressed momentarily with switch SW3 open as shown in FIG. 6 to energize relay CRI which remains energized as 7 described above until the holding circuit therefor is interrupted by opening switch L52. W-hen the dressing tool is actuated by closing push button PE1, it comes to rest after one full cycle of operation because the closing of switch L83 at the end of the cycle does not re-establish a cricuit which will energize relay CRL When it becomes necessary to interrupt a truing cycle for any reason before the cycle is completed, the stop push button FB2 may be depressed momentarily to interrupt the holding circuit for relay CR1 with the result that the slide 46 is returned immediately to its left-hand position.

At the end of each dressing cycle, that is, its movement from left to right and back again, which completes a cycle, the grinding wheel is advanced toward the worlr support to compensate for any reduction in radius of the wheel due to removal of the material from its surface by the dressing tool. For this purpose there is a cam 168 (FIG. 6) on the slide 46 which operates on the return stroke of the slide, that is, movement from right to left to rock a lever arm 17 il which momentarily closes a normally open switch LS4. If switch SWS is closed, as shown in FIG. 6, switch LS-t supplies current by way of switch SWS to a relay CK2 which, when energized, shifts normally open contacts 2CR to the left to a closed position. Current is then supplied through the contacts 2CR from line L1 to the solenoids S2 and S3 of valves V2 and V3, and a holding circuit for relay CR?, is established through normally closed contacts SCR. Energization of solenoid S3 shifts the spool in the valve V3 to the left so as to supply oil through conductor C3 to the left end of the cylinder 168 which operates by displacing the piston 110 therein and the shaft 102 toward the right to advance the stylus 72 forwardly by the predetermined amount previously referred to. At the same time oil is supplied through conductor C4 to one end of a valve chamber 172 in a valve block 174. The valve block 174 is arranged to move between a pair of xed stops 176-176 and is supported therebetween upon three valve rods 178, 179 and 181, one of which, 178, is fixed to one of the stops and occupies the chamber 172 and the other two of which, 179 and 181, are fixed to the opposite stop 176 and occupy the chambers 18B and 182 at the opposite sides of the valve block. Delivery of oil to the closed end of the chamber 172 moves the valve block upwardly as seen in FIG. 6, thereby forcing the valve rods 179 and 181 into the chambers 139 and 182 so that oil occupying these chambers, which are of equal volume, is displaced therefrom through conductors CS and C6 to the valve V2, the spool of which has been displaced toward the left by energization of soienoid S2 concurrent with energization of solenoid S3 and thence by way of the conductors C7 and CS to the compensator chamber 134 and the sensing cylinder 124 respectively, thus moving the stylus and the wheel slide through equal distances toward the grinding wheel and work support respectively. Maintenance of this relationship is assured by the fact that the pistons 122 and 132 are of the same area at the ends exposed to oil pressure.

When the stylus 72 contacts the surface of the grinding wheel it produces a signal which through a crystal pick-up and amplifier (PEG. 6) energizes a relay CRS. While the crystal pick-up may in fact be attached to or incorporated in the stylus 72, this element of the device is simply illustrated schematically in FlG. 6, because the details of this device formed no part of the instant invention. Energization of relay CRE opens normally closed contacts SCR cutting ofi the supply of current from the line L1 and hence de-cnergizing relay CR2 which in turn de-energizes solenoids S2 and S3. De-energization of S2 and S3 allows the spools of the valves V2 and "J3 to shift to the right. Valve V3, when shifted to the right, allows oil to vent from the chamber 172 and supplies oil to chambers 18S and 182 so that the valve block is moved downwardly to its initial position as shown in FIG. 6. Valve V2, which is also shifted to the right, blocks oil from exhausting from the chambers 18() and 132 and allows oil from the cylinders 124 and 134 to vent to the reservoir so that the respective mechanisms controlled thereby are reset.

Simultaneously oil is allowed to vent from the cylinder' 10S through the valve V3 to the reservoir so that the spring 5 114 shifts the shaft 102 to the left thereby retracting the stylus by the aforesaid predetermined distance of 0.01".

It should be understood that the above description of the preferred embodiment of the instant invention as illustrated in the accompanying drawings presupposes a machine configuration in which the sensing device 79 is so disposed that the stylus 72 is displaced radially of the grinding wheel through successive distances equal to succeeding reductions in the radius of the grinding wheel; in which the line of contact between the grinding wheel 14- and the work piece W either intersects or lies very close to a line intersecting the respective axes of rotation of the grinding wheel 14 and the worl: piece W; and in which the grinding wheel 14 is fed toward the work piece W along the line intersecting the axes of rotation of the grinding wheel 14 and the work piecev W respectively. Under such conditions the distance through lwhich the grinding wheel 14 is advanced to compensate for reduction in wheel size must be equal to the distance through which the stylus 72 is moved in sensing this reduction in wheel size. On the other hand, in a machine configuration in which other design considerations dictate a different disposition of the sensing device 76 or a different disposition of the work piece relative to the grinding wheel, any such differences should be taken into account in designing the pistons 122 and 132 and the cylinder chambers with which they cooperate as well as the components of the coordinnated control means for the concurrent actuation of these pistons so that the displacements of the respective pistons are properly -proportioned if the particular machine configuration requires that they not be equal.

It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications and equivalents which fall within the scope of the `appended claims.

What is claimed is:

l. In a grinding machine, a work support, means mounting a grinding wheel at a predetermined position relative to the work support for feeding movement, a tool operable to dress the face of the grinding wheel, and sensing means operable at the end of each dressing operation to advance the mounting means independently of said feeding movement toward the support by the amount that the face of the grinding wheel is displaced relative to the mounting means due to dressing.

2. In a grinding machine, a work support, means mounting a grinding wheel at a predetermined position relative to the work support for feeding movement, means for effecting feeding movement, a tool arranged to be moved transversely of the face of the grinding wheel to dress the grinding wheel, means for effecting a cycle of movement of the tool, and a sensing device operable to advance the grinding wheel toward the work support independently of said feeding means by an amount corresponding to thc displacement of the face of the grinding wheel effected by the dressing cycle, operation of said sensing means being initiated at the end of each dressing cycle.

3. in a grinding machine, a work support, means mounting a grinding wheel at a predetermined position relative to the work support for feeding movement, means for effecting movement of the mounting means, a tool arranged to be moved transversely of the face of the grinding wheel and back to dress the face of the grinding wheel, means for effecting a cycle of movement of the tool, a sensing device movable toward the face of the grinding wheel, means operable at the end of each dressing cycle to produce concurrent corresponding movements of the sensing device and the grinding wheel, and means operable by engagement of the sensing device with the face of the grinding wheel to terminate said movements.

4. In a grinding machine, a work support, means mounting a grinding wheel at a predetermined position relative to the work support for feeding movement, means for eiecting feeding movement of the mounting means, a tool arranged to be moved transversely of the face of the wheel and back to dress the wheel, means for effecting a cycle of movement of the tool, a sensing device movable toward the wheel, means `for effecting movement of the sensing device and of the Wheel in unison in proportionate amounts toward the Wheel and toward the Work respectively, means for initiating such movement at the end of a dressing cycle, and means for terminating such movement when the sensing device touches the face of the wheel.

ln a grinding machine, avvork support, means mounting a grinding wheel at a predetermined position relative to the Work support for feeding movement, a tool arranged to be moved transversely of the face of the Wheel `and back to dress the wheel, means for effecting a cycle of movement of the tool, a sensing stylus movable toward the wheel, drive means for effecting movement of the sensing stylus and the wheel proportionate Iamounts, the one toward the grinding wheel and the other toward the work support, means for intiating operation o-f the drive means at the end of a dressing cycle, and means operable when the stylus touches the grinding Wheel to terminate operation of said drive means.

6. Apparatus according to claim 5, wherein the stylus is yieldably supported.

7. In a grinding machine, a Work support, means mounting a grinding wheel at a predetermined position relative to the Work support, a tool arranged to be moved transversely of the face of the wheel and back to dress the wheel, means for effecting `a cycle of movement of the tool, a sensing stylus movable toward the Wheel, fiuid motors operable to effect movement of the sensing stylus and wheel corresponding amounts, the one toward the wheel and the other toward the work support, means operable at the end of a dressing cycle to effect operation of the fluid motors and means operable when the stylus moves into engagement With the Wheel to terminate operation of the uid motors.

8. In a grinding machine, a work support, means mounting a grinding Wheel at a predetermined position relative to the work support, a tool arranged to move transversely of the face of the Wheel and back to dress the wheel, means for effecting a cycle of movement of the tool, a sensing stylus movable toward the Wheel, uid motors operable to effect concurrent movement of the sensing stylus and wheel proportionate amounts, valve means operable to control the flow of pressure fluid to the motors, means operable at the end of a dressing cycle to effect operation of the valve means to supply fluid pressure to the motors in a direction to advance the stylus and the Wheel, and means operable by engagement of the stylus with the wheel to render the fluid motor means inoperative.

9. In a grinding machine, a work support, means mounting a grinding Wheel at a predetermined position relative to the Work support, a tool arranged to move transversely of the face of the wheel and back to dress the wheel, means for effecting a cycle of movement of the tool, a sensing stylus movable toward the Wheel, fluid motors operable to effect concurrent movement of the sensing stylus and the Wheel corresponding amounts, valves and valve actuating means operable to supply fluid pressure to the motors in directions to advance the stylus and wheel, means movable With thetool in reciprocation to effect actuation of said valve operating means at the end of a dressing cycle, and means operable when the stylus touches the wheel to render said valve actuating means inoperative.

l0. ln a grinding machine, a work support, means mounting a grinding Wheel at a predetermined position relative to the work support, a tool arranged to move transversely of the face of the Wheel and back to dress the Wheel, means for effecting a cycle of movement of the tool, a sensing stylus movable toward the wheel, fluid motors operable rst to advance the stylus a predetermined amount and then operable to effect concurrent corresponding movement of the sensing stylus toward the Wheel and of the Wheel toward the Work support, means movable with the dressing tool operable at the end of a dressing cycle to effect operation of the motors, means operable by contact of the stylus with the face of the Wheel to render the motors inoperable, and means operable When the motors are rendered inoperable to retract the stylus said predetermined amount.

l1. In a grinding machine, a Work support, a grinding Wheel, a slide mounting the grinding Wheel for movement toward the work support, means for effecting movement of the slide toward the work support, a dressing tool, a cross-slide mounting the dressing tool for movement transversely of the face of the wheel and back to dress the wheel, a motor means for effecting a cycle of reciprocation of the cross-slide, a sensing stylus movable toward the face of the wheel, mechanism operable 1ndeoendently of the rst named means to advance the slide and hence the wheel toward the work support, motor-s operable to effect coordinated concurrent movement of the stylus and said mechanism to advance the stylus and slide toward the Wheel and toward the work support respectively corresponding amounts, means on the cross-slide operable at the end of a cycle of movement of the dressing tool to effect operation of the motors and means operable by contact of the stylus vvith the face of the Wheel to render said motors inoperative and to retract the stylus from the wheel by a predetermined amount.

l2. In a grinding machine, a Work support, a grinding Wheel, a slide mounting the wheel for movement toward the support, means for effecting movement of the slide toward the support to feed the Wheel toward the Work, a dressing tool, a cross-slide mounting the dressing tool for movement transversely of the face of the wheel and back Ito dress the wheel, a first motor for effecting a cycle of reciprocation of the cross-slide, a stylus occupying a retracted position with respect to the Wheel, a first mechanism for moving the stylus toward the Wheel, a second mechanism for moving the wheel slide toward the work support independently of the first-named means, a second motor operable to effect an initial operation of' the mechanism for moving the stylus to advance the stylus an amount corresponding to the distance it has been retracted from the Wheel, third and fourth motors respectively operable to effect operation of said first mechanism to move the stylus further toward the wheel and said second mechanism to move the slide a corresponding amount toward the work support, means operated by contact of the stylus With the wheel to render inoperable the motors operating said mechanisms, and means operable when these motors are rendered inoperable to return said stylus to its retracted position.

No references cited.

US3033187A 1961-03-13 1961-03-13 Wheel wear sensing device and compensator Expired - Lifetime US3033187A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155086A (en) * 1962-03-10 1964-11-03 Lidkopings Mek Verkst S Aktieb Truing and feeding method and apparatus for grinding machines
US3763844A (en) * 1971-07-08 1973-10-09 Warner Swasey Co Apparatus and method for dressing grinding wheels
US3928943A (en) * 1973-09-17 1975-12-30 Reishauer Ag Device for the feed of grinding tools to grinding machines
US4051830A (en) * 1976-05-11 1977-10-04 Cincinnati Milacron, Inc. Wheel dressing apparatus and method
US4213277A (en) * 1977-05-05 1980-07-22 Maag Gear-Wheel & Machine Company Limited Method for dressing a grinding wheel
EP0045380A2 (en) * 1980-07-31 1982-02-10 Maag-Zahnräder und -Maschinen Aktiengesellschaft Control circuit for an adjusting and dressing device of a grinding wheel
FR2545028A1 (en) * 1983-04-27 1984-11-02 Schaudt Maschinenbau Gmbh Method to erect wheels
US20050067346A1 (en) * 2000-10-19 2005-03-31 Blue Membranes Gmbh Flexible and porous membranes and adsorbents, and method for the production thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155086A (en) * 1962-03-10 1964-11-03 Lidkopings Mek Verkst S Aktieb Truing and feeding method and apparatus for grinding machines
US3763844A (en) * 1971-07-08 1973-10-09 Warner Swasey Co Apparatus and method for dressing grinding wheels
US3928943A (en) * 1973-09-17 1975-12-30 Reishauer Ag Device for the feed of grinding tools to grinding machines
US4051830A (en) * 1976-05-11 1977-10-04 Cincinnati Milacron, Inc. Wheel dressing apparatus and method
US4213277A (en) * 1977-05-05 1980-07-22 Maag Gear-Wheel & Machine Company Limited Method for dressing a grinding wheel
EP0045380A2 (en) * 1980-07-31 1982-02-10 Maag-Zahnräder und -Maschinen Aktiengesellschaft Control circuit for an adjusting and dressing device of a grinding wheel
EP0045380A3 (en) * 1980-07-31 1982-06-02 Maag-Zahnrader Und -Maschinen Aktiengesellschaft Control circuit for an adjusting and dressing device of a grinding wheel
FR2545028A1 (en) * 1983-04-27 1984-11-02 Schaudt Maschinenbau Gmbh Method to erect wheels
US20050067346A1 (en) * 2000-10-19 2005-03-31 Blue Membranes Gmbh Flexible and porous membranes and adsorbents, and method for the production thereof
US7014681B2 (en) 2000-10-19 2006-03-21 Blue Membranes Gmbh Flexible and porous membranes and adsorbents, and method for the production thereof

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