US1917468A - Ball race grinder - Google Patents

Description

BALL RACE GRINDER Filed May 27, 1930 A. P. STEINER El' AL July 11, 1933K.

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July 11, 1933. A P STElNER Er AL 1,917,468

BALL RACE GRINDER Filed May 27, 1930 5 Sheets-Sheetv 2 -mmmm July 11, 1933.

A. P. sTElNER Er AL 1,917,468

BALL RACE GRINDER Filed May 27, 1930 5 Sheets-Sheet 5 I Q- l IN VE N TOR 5 July 11, 1933 A. P. STEINER ETAL 1,917,468

BALL RACE GRINDER Filed May 27, 1930 HVVEIVTO` Amos P Se/'nen BY Edgar P Wine.

\ Haro/d E. Bab/den I; A TTORNEY July 11, 1933. A. P. STEINER Er AL 1,917,468

BALL RAGE GRINDER Filed May 27, 1930 5 Sheets-Sheet 5 INVENTORY. /9/7205 PsWe//se/ BY/ Edgar P Mae.

A Haro/d .Ba/w' el:

Patented July 11., 1933 UNITED STATES PATENT OFFICE AMOS P. STEINER, DGAR P. WINE, AND HAROLD E. BALSIGER, OF WAYNESBORO, PENN- SYLVANIA, ASSIGNORS TO LANDIS TOOL COMPANY, OF WAYNESBGR-O, PENNSYL- VANIA,`A CORPORATION OF PENNSYLVANIA BALL RACE GRINDER Application filed May 27,

This invention relates to machines for grinding the inside race of ball bearings and it is an object to provide a machine having a simple centralized control for all of the several mechanisms on the machine.

`.f\ further object is to provide hydraulic means for slowing do'wn the feed for linish grinding the work and stopping the feeding of the grinding wheel toward the work and to increase the speed of the work at a predetermined time for polishing the Work.

Further objects and advantages will become apparent as the description proceeds.

Referring to the. accon'ipanying drawings which are. made a part hereof and on which similar reference characters indicate similar parts.

Figure 1 is an end elevation of the machine.

Figure 2, a front elevation of the oscillating work carriage assembly,

Figure 3, a plan View of the wheel feed mechanism,

Figure 4, a front elevation of the wheel feed mechanism.

Figure 5, a detail of thelatch for holding the timing valve in inoperative position,

Figure 6, a diagrammatic view showing the control valves and the'. relationship between the various mechanisms. and

Figure 7', a sectional elevation showing adjustment of the grin-ding wheel.

In the drawings numeral l0 indicates the bed of a grindingmachine having an oscillating. work supporting carriage 1 1. Numerals 1;). and l 1"espectivcly indicate transverse and longitudinal slides and 14 and 15' indicate a foot. stock and head stock respectively. A grinding fixture 16 having a Work piece 17 'secured thereon is' mounted between the head stock and thefoot stock. The grinding tixturc is driven by means of a work drive coupling 1S of any well-known construction. The head stock spindle 19 is driven by means of a {luid motor Q0. driving connection between the motor and head stock spindle being by means of a'chain belt 21. Any Suitable driving connection, however, may be provided. 'lhe work carriage 1l is oscillated by means ot' a tluid motor. 22. Means'for controlling the motive fluid to said motor- Will later be de- 1930. Serial No. 456,196.

scribed. The work carriage assembly oseillates about an axis in line with the center of the groove desired to be ground in the work piece 17, so as to produce the necessary groove in the periphery of the work to be ground.

A grinding wheel 23 is driven from a motor 24 by means of a belt Q5. The grinding wheel is mounted on a wheel base 26 which ma y be manually moved toward and from the .work by means of a hand wheel 27 in manner wellkn'own in grinding machines, such for example as that shown in our copending application, Ser. No. 389,492. filed August Pill. 1929 for Hydraulic ball race grinders. Means for automatically feeding the grinding wheel toward the work is quite similar to thatshoWn in the copending application above referred to, except that in this present application the wheel feed control is mounted at the rear of the machine. 'lhisI arrangement avoids the necessity of long operating rods and thus simplifies the mechanism. Briefly stated the feed mechanism consists of a cylinder 28 mounted in the bed of the machine having pressure luid lines Q9 and 30 connected to the rear and front ends ot the cylinder to conduct pressure fluid to and from the cylinder. A piston 31 operates in the cylinder and has a piston rod 3Q extending rearwardly and attached to a bracket 33 secured to and depending from the wheel hase Q6. At its rear end thev rod 32 has secured thereon a flanged collar 34 by means ot nuts 35. The rod 32 passes through a sleeve 3G.

4This sleeve is threaded on its exterior to cooperate wlth threads in a bracket 3T on the.

machine base. The forward end of the sleeve 3G is flanged and has a gear segment 38 extending a port-ion of the way around it. This gear segment is engagcable by a rack SSS) on a piston rod 40. The segment 38 has a project-ing lug 41 thereon which engages a stop 4Q secured to the bracket. 37. the purpose of the stop beingto limitrotation of the sleeve 36 beyond a predetermined point. Rotation of the sleeve 36 is produced by means of 'a piston 43 operating in a cylinder 44, the piston 43 being connected to the piston rod 40. 'Fluid ports 45 and 46 in the cylinder 44 at opposite sides of the piston 43 are controlled .j spool is engaged by one arm 54 of a bell crank,

by means of a valve 47 having disks 48, 49 and 50 thereon and having a valve stem 51 on' the outer end Iof which is a spool 53. This grinding position it will be seen that the flange on the collar 34 will engage the arm ating mechanisms.

56 just before the collar comes into engagement with the sleeve 36 so'that the valve 47 will be shifted to the left against tension of spring 57, the, spring tending normally to hold the valve to the right.

When the valve 47 is held-to the left, port 46 is putin communication with. pressure fluid line 58. Line 58 connects through valve casing 59 with fluid line 60, through needle valve 61 with fluid line 62 and 63 to the pump 64. Pressure fluid may therefore be delivered by the pump to the left of the piston 43 to move this piston to the right and to rotate the sleeve 36 counterclockwise as shown in Figure 6 to allowit'to be withdrawn as shown in Figure 3 to perlnit the wheel base to be fed toward the work by pressure fluid delivered through the line 29 to the rear of the piston 31. The rate with which the pist-on 43 moves to the right is determined by the needle valve 61 which may be adjusted to permit Huid to flow therethrough at any predetermined rate. Fluid line 30 enters directly into cylinder 28 through a port 65 and also enters through a port 66 and restricted valve 67. There is provided therefore a small fluid chamber 68 at the end of the piston which acts as a cushion to slow down movement of the wheel base toward the work after the piston has shut ofl' the port 65 as is shown in Figure 6. When the piston has reached this position the re.-

stricted valve 67 slows down its movement `until collar 34 strikes sleeve 36 when the wheel base is fed into final described.

At 69 is'shown a valve casing which houses the main control valve for the various oper- Within this valve casmg is 'positioned a valve 70 having a plurality of disks 71, 72, 73, 74, and 76 thereon. A spring 77 is positioned beneath the disk 76 and normally tends to hold the valve stem in forward position as viewed in Figure 6. A motive fluid line 78 .coming from the discharge side of the pump branches into pipes 80 and 81. The pipe 81 branches off into a line 82 which enters valve chamber 69 above the disk 72 and in the position shown in Figure 6 communicates through pipe 83 and neevalve chamber 85. -A valve 86 directs fluid from the valve chamber 85 to either of two lines 87 and 88 which operate the motor 22 which oscillates the work carriage 11. Valve 86 is operated by means of a valve stem 89 by any suitable mechanism on'the machine not shown, such position, as previously -A disk 110 has a spring for example as the mechanism shown in our copending application above referred to. Fluid conduit 82 branches and the branch 90 passes through an adjustable needle valve 9.1 into a chamber in the valve 69 which is formed between disks 73 and 74. The fluid passage 90 connects with fluid passage 29 when the valve stem is in the position shown in Figure 6 to admit fluid from the pump to the rear side of the piston 31 to move the wheel base toward grinding position. Pressure fluid line 81 also communicates with a valve chamber formed between disks 75 and 76 which communicates with a fluid line 92. -This fluid line leads to the work rotating motor. 20, passage of fluid-thereto being controlled by a needle valve 93. Fluid lines 94, 95, 96, 97, 98 and 99 all indicate return fluid lines to the reservoir 100 positioned in the bed of the machine.

At 59, 102 and 103 are valve chambers which will now be d-escribed. `The valve chamberv 102 has a valve stem v101 having ldisks 104 and 105 thereon, a spring 106 bechamber in valve 59 above the piston 109.

111 positioned therebeneath. Downward movement of the disk 110 is limited by an adjustable screw 112. When the valve disk 105 is in elevated position so that fluid may pass from the line 80 through the valve chamber -102 to the line 107 the' piston 109 is depressed against the tension of the spring 111 until disk 110 strikes stop screw 112 so that fluid line 60 is partially closed from line 58, thus restricting flow of fluid to the left hand end'of piston 43,

thereby retarding rotation of segment 38 and sleeve 26 to slow down feed of the grinding wheel when the work is nearly to size.

Positioned in the valve chamber 103 is a valve 113 having pistons 114, 115 thereon, a spring 116 being positioned in the end of the chamber against the disk 115 normally to hold the valve to the right as shown in Figure 6. When fluid line 108, however, is open to pressure line 80 pressure is delivered to the right of the disk 114 to move the disk 115 to the left to open communication between valve ports 117 and 118 so that fluid may pass directly from pressure Vline 92 through ports 117. valve chamber 103 and l'.

port 118 to the work drive motor 20. 4An adjustable needle valve 119 may be set to control the passage of fluid through this cir.- cuit. This additional course for the fluid,

however, Will cause the work drive motor to vmanually operable valve shown as a whole` at 121 enables the operator to connect both sides of the oscillating motor 22 with the exhaust line 97 so that the work carriage may be manually freely oscillated.

Means for moving the valve 101 in the valve chamber 102 will now be described. The

i valve casing 102 has a pair of bracket arms 1:22. Attached to the base of the machine is another bracket 124 in which the outer end of the rod 40 slides. Pivoted at 125 on the upper end of the bracket. 122 is a rock arm 126. One end of the rock arm is engaged by a disk 127 on the rod 40. The

other end of the rock arm engages ay spool 128 on the upper end of the valve stem 101. From the side of the spool opposite to that in which the arm of the bell crank lever 126 engages extends a pin 129. A latch 130 is pivoted at 131 to the side of the valve casing 102. This latch engages over lthe pin 129 normally to hold the valve stem down against the tension of the spring 106 to hold the disk 105 in the position shown in Figure 6. A tension spring'132 is secured to a pin 133 on the latch at one end and secured at its other end to a pin on the. bracket 123. Positioned near the end ofthe. rod 40 and spaced from the disk 127 is an adjustable disk 134. lVhen the ro'd 40 is moved to the right and reaches a predetermined point in its movement in that direction the disk 134 engages the top 135 of the latch 130 and releases the pin 129 so that the Valve may move upward under the tension of the spring 106. .1t will be apparent that when the piston has reached this point in lts movement to the right, as just stated, the wheel base will have moved a major part of its travel rapidly, and will at this point be slowed down to bring the grinding wheel to its forward limit to complete grinding of the work to size. The disk 134 of course may be adjusted. as indicated by the screw threads on the rod 40 to cause the latch 130 to be tripped al any desired time.

The operationof the device is as follows: Assume that the valve stem is in the position shown in Figure 6 in which position it will be when the lever 135 is in the. position shown in full lines in Figure 6. The wheel hase has moved to the position at which the llauge ou the collar 34 has engaged the arm 56. Further movement of thev wheel base forward will move the valve stem 47 to the lel` t so that valve disk 50 will open communication between the line 58 and the port 46. Pressure fluid from the pump will pass through needle valve 6l through valvel chamber 59 and line 58 to the left of the piston 43 to start movement of this piston to the right. its movement in that direction being limited by the rate of flow of fluid through the needle valve 61. It should be noted that fluid line 81 is in comunlnication through line 90, needle valve 91 and line 29 with the chamber to the rear of'the piston 31 so that the wheel base. will be moved forward. The grinding operation will begin and the speed with which the grinding wheel may be moved into the work will be limited b v the rate with which the sleeve 36 is retracted as this sleeve is rotated by the rack 39 and thel gear segment 38. Ol course the distance through which the wheel base moves during feeding is very slight as only a very small amount of stock is to be taken oft' the work. 'hen the wheel has reached a predetermined point in its forward grinding position the disk 134 strikes the upper end of the latch 130 and releases the pin 129 which holds down the valve stem 101. As soon as it is released this valve stem moves up so that fluid line is brought into communication with fluid lines 107 and 108. As soon as fluid line 108 is opened up pressure fluid from this line moves the piston 114 to the left .to speed up rotation of the work drive motor as previously described. Pressure fluid through the line 107 depresse-s piston 109 so that line 60 is partly cut off from line 58. So long as the mechanism remains in the position just described, the work drive motor continues to operate at increased speed and the oscillating motor will continue to operate at its normal speed while the wheel base will be moved at retarded speed to its filial grinding position, as determined by stops 41 and 42. The operator then moves the lever 135 to the position shown in dotted lines at A. This moves valve disk 71 to close off fluid line 83 and stop oscillation of the work. Valve disk 7 3 closed off' comn'lunication between lilies 90 and 29, opening 29 to exhaust through 98.

`Disk 74 opens communication between lines and 30, through adjustable cheek valve 67 and port 66 to cylinder 68, withdrawing wheel base. After piston 31 has uncovered port 65 the pressure fluid enters through port. rl`hc Work drive motor continues rotation. rl`he. opera-tor may then place a new piece of work in the machine. As the wheel base moved to the rear the flange on thel collar 34 released the arm 56 of bell crank lever to permit the spring 57 to shift valve 47 to the right; pressure fluid from line. 62 therefore passes through port 45 to the right of the piston 43 to move the piston to the left to position the threaded sleeve 36 in position t-o be engaged by the sleeve 3 again when the wheel base again moves forward. As piston 43 moves to the left disk 127 through crank 126 depresses valve 101 thus closingoff line 107 from line 80 and opening both Ilines 107 and 108 to exhaust line 96. al lowing springs 111 and 116 to reposition valves 109 and 114 respectively, at the same time latch 130 engages pin 129 to hold valve 101 against pressure of spring.106. The apparatus is then reset for a second grinding 139 may be secured about the Sp-indles 140 `of the shaft are4 operation and the cycle continued as before.

In Figure 7 is shown more in detail'the construction and mounting of the grinding Wheel, the grinding wheel shown being some- Whatedifferent from that shown in Figure A1 i end of the support 143 is screw threaded a sleeve nut 144, the nut being held in adjusted position by Va lock nut 145. The inner end o f the sleeve nut 144 is provided with an in- 1 tegral flange 146 and a nut 147 is threaded into the outer end of the sleeve nut 144, the

inner ring portion of the nut 147 co-operate ing with the flange146 to hold the outer races 148 of ball bearing 149, theV inner race bear-ing 150 being held againstthe end of the spindle 140 by means of a nut 151 which is threaded on the end of the spindle. The sleeve nut 144 may be adjusted axially and locked in ad- ,justed position to adjust the shaft 140 and consequently to position the grinding wheel in any predetermined axial position. A pulley 1452 is mounted on the shaft, the pulley here shown being grooved to adapt it to be driven by a plurality of belts.

It will be obvious to those skilled in the art that vvarious changes may be made in our device without departing from the spirit of the invention and therefore we do not limit ourselves tol what is shown inthe drawings and described in the specification, but only as indicated in the appended claims.

Havingtlius fully Vdescribed our said invention,what we claim as new and desire to secure by Letters Patent, is;

1. A machine for grindingthe inside race I of ball bearingscomprising a work support work driving means, a wheel base, va. motor for movmg said Wheel base toward the work support, hydraulic means for limiting theV speed of movement of the wheel base towardthe work support, and automatic means for speeding up the .work driving means asI the wheel base reaches a predetermined point-in its movement toward the Work grinding position', substantially as set forth.

2. A machine forgrinding the inside race' of ball bearings comprising a work support, a motor for oscillating` the work support, means for centering thel work about the axis otoscillation ofthe work support, a work drive motor, av wheel base having a grinding wheel mounted thereon, a fluid motor for moving the wheel base toward the work support, Huid controlled means for limiting thespeed of movement of the wheel base toward the work support and means for cushioning movement of the wheel base toward the work support as it nears the limit of its travel in that direction, and means for speeding up the kgrinding movement, substantially asset forth.

4. In` a machine for grinding'the inside race of ball bearings having a' work carriage, awork drive motor, a wheel base and a motor for moving the wheel base toward the work carriage, a central control valve for operating the Work drive motor and the Work feeding motor, automatic'means for speeding up thev operation of the work drive motor after the wheel feeding motor has moved the wheel base to a predetermined point in its grind.- ing movement, and means for slowing down movementof the wheel base toward the work support as the Wheel base approaches the limit of its travel during the work feeding movement, substantially as set forth.

5. In a grinding. machine for the inside race of ball bearings, a work support, a wheel base, means for oscillating the work support and for rotating the work means to move the wheel base toward and away from the work and a central control valve for all of said means, whereby all of the operations of the machine may be controlled in proper sequence by a single lever, substantially as set forth.

6. In a ball race grinding machine, a wheel base movable toward and from grinding` position and means for feeding it during grinding operation comprising a fluid motor operable to move the wheel base toward grinding position, and means including a second fluid operated mechanism-for limiting the speed with 'which the wheel base moves toward grinding position, and means operable by said lastnamed mechanism for speeding up rotation ion wheel base, a grinding wheel mounted upon the Wheel base, a iiuid motor for moving the grinding wheel toward the work during grinding operation, means includin a fluid operated mechanism forlimiting t e speed with which the said fluid motor moves the wheel` base during grindingl operation, and

means controlled by the said fluid motor for,

grinding wheel toward the work during grinding operation, means including a fluid Vope-rated mechanism for limiting the-speed of the fluid motor which moves the wheel base during grinding operation, and means `controlled by the said last-named fluid motor for speeding up rotation of the work after the grinding wheel base has reached a predetermined point in the wheel feeding movement, said last-named means comprising a valve/operable at a predetermined time in the operation of said motor for admitting v additional fluid to the said work drive motor vto speed up rotation of thework, substantially as set forth.

9. In a machine for grinding the inside race of a' ball bearing, a grinding wheel support, a grinding wheel mounted thereon, a motor for moving the grinding wheel support toward the work, means for supporting and means for rotating the work, a motor for regulating thespeed with` which the grinding wheel moves into work grinding position,

a valve for controlling operation of the said regulating motor, a second valve having means thereon for locking it in open position to permit the motor for controlling movement of. the grindingv wheel into grinding f position to operate at 'normal speed, and means for releasing said valve to allow it to move to a position to cause a slowing down of the said speed regulating motor and at the Sametime speed up the work drive means, substantially as set forth. n

In witness whereof, we have hereunto set .our hands at Waynesboro, Pennsylvania, this 20th day of May, A D. nineteen hundred and thirt y AMOS P. STEINER.

' HAROLD E. BALSIGER.

EDGAR P. WINE.

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