US2271963A

US2271963A - Roll grinding machine

Info

Publication number: US2271963A
Application number: US368632A
Authority: US
Inventors: Albert W Wigglesworth; Elwood R Mons
Original assignee: HILL CLARKE MACHINERY CO
Current assignee: HILL CLARKE MACHINERY CO; HILL-CLARKE MACHINERY Co
Priority date: 1940-12-05
Filing date: 1940-12-05
Publication date: 1942-02-03
Anticipated expiration: 1959-02-03

Description

4 Sheets-Sheet 1 v Y J z Q w R & 2 w. n

m l umfix M W umm I I I I if: [ll m m m M m M v QM Y 7 mm m W ii i Feb. 3, 1942. A. w. WIGGLESWORTH ETAL ROLL GRINDING MACHINE Filed Dec. 5, 1940 Feb.'3, 1942. A. w. WIGGLESWORTH ETAL 2,271,963

ROLL GRINDING MACHINE Filed De c. 5, 1940 4 Sheets-Sheet 2 Feb. 3, 1942. A. w. WIGGLESWORTH ETAL 2,271,963

ROLL GRINDING MACHINE Filed Dec. 5, '1940 4 Sheets-Sheet s jz uenza'l/rs Feb. 3, 1942. A. w. WIGGLESWORTH' ETAL 2,271,963

ROLL GRINDING MACHINE Fi led Dec. 5, 1940 4 Sheets-Shet 4 flu/aacl A 25% Z. M

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w l u 1 Patented Feb. 3, 1942 UNITED IS'lA 'IES I 12,271,963 ROLL GRINDING MACHINE Albert W. Wigglesworth, MiamiBeach, Fla.,-and

Elwood R. Mons, Chicago, Ill., assignors to Hill- ClarkeMachinery 00., Chicago, 111., a corporation of Illinois Application December 5, 1940, Serial No. 368,632 6 Claims. r01. 51-95) This invention relates to grinding machines and particularly to grinding machines adapted to grind rolls having crowned, concave, or specially formed surfaces.

Grinding machinescomprise a base on which 5 are slidably mounted a longitudinally. reciprocable work carriage "and'a' transversely movable wheel base on which the grinding wheel and motor are mounted so that the rotatable grind- I ing wheel may be moved, with the transverselyio' as true contours of the convex or concave'form "are insured by the construction herein disclosed. These are qualities in the work which are not movable base, into operative position relatively to the longitudinally reciprocable'carriage and the work thereon.

The main object of'our invention is to provide grinding machines of the character describedls with means for automatically grinding rolls having crowned, concave, or specially formed surfaces, said means being embodied in the grinding machines in such manner that the conventional mounting of the grinding wheel on a transversely20 I invention, taken in the plane of theline l-I' of Fig.2.

movable base and the movementof the base in a horizontal plane are not altered, and; consequentlythe efficiency of the machines is not impaired and undue wear, of the machine parts is avoided. "25

' Another object to provide means for automatically changing the position of the grinding wheel relatively to'the Work while the work is being moved across the grinding wheel, said means being vpositively connected to the grinding BO- wheel base and to a fixed supp'ort in suchman ner that movement of the grinding wheelboth toward and away from the work is positively controlled and variations are avoided. Said con-,

positionof the grinding wheel relatively-"to the work while the work is being reciprocated'rela- 'tively to the grinding wheel includes a member adapted to receive relatively long transverse and theiwork is not inone horizontal plane durfingfthe entire rinding operation.

The invention herein described providesmeans forautomatically moving the grinding wheel base transversely and in a horizontal plane while the rotating work is being moved longitudinally a predetermined distance past the rotating grindfing wheel on said base, whereby the work is given a concave or convexsurface, as desired. Smoothne'ss andjregularity of the ground surface as well developed in the grinding operation.

In the drawings: 1

" Fig. '1 is a transverse sectional view, partly in elevation, of' a grinding machine embodying our Fig. 2 is a plan view of'part of the machine showninFig. 1.

Fig. 3 is a rear elevation of part of the machine "shown in Eigsfl and 2, partly in section, as in- "dicated by the line33 of Figspl and 5.

Fig. {I is a longitudinal', vertical sectional view, taken in the plane of the line 4-4 of Fig. 1.

Fig. 5 is atransverse'; vertical sectional View, taken in the plane of the lines 55 of Figs} and 3.

Fig. 6 is a horizontal sectional view, partly in w iplanelevation, taken inthe plane of the linel66 trolling meansfor automatically changing the 35 of-Figfi. 1

Fig. '7 is a plan view, on an enlarged-scale, of

movements whereby relatively short movements x io complete grinding machine has not been in a longitudinal direction are transmitted by said memberto the grinding wheel base. -The effect of this feature of construction is that very fine adjustments of the position of the grinding wheel can be accomplished. I

It has been proposed heretofore to tilt the grinding wheel base intermittently by raising and lowering its rearward end and thereby to change the position of the grinding wheel relatively to the work as the work is being moved past the wheel, but the constructiongand operation are objectionable in that the "wheel base'and the wheel mounted thereon are. not uniformlyand efficiently supported while'in the tilted positions shown in the drawings, but reference is made to Patent No. 2,074 ,308, dated March lfi, 1937, which shows the type of grinding machine'in which our invention has been embodied.

In that embodiment shown in the drawings,-

the machine base In supports a longitudinally reciprocable work carriage I l which is slidable on A conventional tail stock is indimeans, not shown, such, for example, as the mechanismdescribed in the aforesaid patent.

and the line contact between the grinding wheel "56 A grinding wheel [4 is mounted on a wheel base |5 on bearings l6, and a motor I1 is also mounted on a raised portion of said wheel base I5. The motor shaft l8 has mounted on it a pulley I9 operatively connected by belts 26 to the pulley 2| on the shaft 22 on which the grinding wheel I4 is mounted.

The wheel base I5 is not mounted directly on the machine base '|0, as shown in the prior art, but rests on an intermediate base or support 23 which is movable transversely of the base Ill. The position of the intermediate support 23 rela'- tively to the machine base I is adjusted by means of a hand wheel 24 on a transverse shaft 25 provided with a screw threaded portion 26 which engages the half nut 21 fixed on the bot tom of the intermediate support 23. By actuating the hand wheel 24, the position of the support 23, as well as the wheel base I and grinding wheel I4, are adjusted to bring the wheel |4 into operative position relatively to the work, such as the roll R shown in Fig. 2.

If the wheel base l5 were fixedly mounted on the intermediate support 23, adjustment of the position of the latter on the base In would result in the work contacting portion of the grinding Wheel working in one vertical plane parallel to the axis of the work, and consequently the roll or work R would have ground surfaces parallel with the axis of the roll from end to end. In order to produce a crowned surface on the roll,

or a concave surface, we have provided means for automatically varying the position of the wheel base I5 on the intermediate support 23 so that the wheel l4 contacts the work in different vertical planes as the work moves across the grinding surface of the wheel.

The means for automatically moving the wheel base l5 relatively to the intermediate support 23, transversely of the baselfl, comprises the following mentioned parts. The longitudinally extending rack 28 fixed on the bottom of the work carriage meshes with a gear 29 on the rotatable shaft 30 extending through the frame members 3| of the machine, the gear 32 keyed to a sleeve 32' on the shaft 36 meshing a large gear 33 keyed to the stub shaft 34. The sleeve 32' is slidable on but keyed to the rearward portion of the shaft 30. The stub shaft 34 extends through a bracket 35 which carries the change speedgearing about to be described. The end of the shaft 30 and sleeve '32 are also mounted in the bracket 35.

Fixed on the outer or rearward end of the shaft 34 is a gear 36 which meshes with an idler gear 3'! adjustably mounted in a slotted lever er quadrant 38 by a pin 39. meshes with a large gear 4 |l mounted on a shaft 4| which extends through the bracket 35. The slotted lever 38 is mounted on the rearwardly projecting hub of the bracket 35 The slotted lever 38 and the idler gear 3! can be adjusted in desired position to accommodate different sized gears by means of a nut and bolt 42, the bolt extending through a slot 43 at one side of the lever 38. The bolt extends through said slot 43 and into a hole 44 in the bracket 35.

The bracket 35, carrying the gearing described, is fixedly secured to the intermediate support 23 by bolts 45, in such position that the shaft 4| is slightly lower than the support. On the inner end of said shaft 4| is a bevel gear 46 which meshes with a bevel gear 41 on a vertical shaft 48 which extends through the interr'nediate support 23.

An eccentric indicated as a Whole by the nu- The idler gear 31 meral 49 is mounted on the upper end of the shaft 48 and held in position by a Washer and nut 50. Preferably the eccentric 49 comprises an outer ring 5|, a ball race 52, and an eccentric sleeve 53 keyed to the shaft 48 at 54.

A spring metal bar 55, having its side surfaces vertically disposed, extends longitudinally between a fixed support 56 and the grinding Wheel base I5. The fixed support 56 as herein shown comprises a vertically disposed L-shaped plate 51 bolted at 58 to a vertical surface of the intermediate support 23. The bar 55 is welded to the upwardly extending part 6| of the L-shaped plate 51., and

plates

59 and 66 are welded, respectively, to the plate 51 and the bar 55. Any arrangement whereby the end of the bar 55 is firmly connected to the intermediate support 23 will suffice.

The opposite end of the bar 55 is welded as indicated at 62 to the end of the plate 63 which is bolted at 64 to the rear surface of the grinding wheel base I5.

About midway between its ends, the bar 55 is firmly connected to the outer ring '5| of the eccentric 49 by a bolt 65 which extends" through a triangularly shaped block 66 and through said bar 55 into the ring 5| of the eccentric. This construction affords a very secure connection between the bar 55 and eccentric 49, without impairing the flexing capacity of the bar 55.

The bar 55 or connector between the intermediate sul po'rt 23 and the grinding wheel base I5 is normally slightly flexed, as indicated in Fig. 6, its length when thus flexed being exactl correct for positioning the grinding wheel base l5 on the intermediate support 23 so that the grinding wheel will b'ein normal Operative position relatively to the work. F 7

By operating the eccentric 49, the bar 55 will be flexed to a greater degree than it is normally, thereby varying the effective length of the bar 55. It will be understood that the operation of flexing the bar 55 bythe working. of the ecc'entric, after the 'said bar has been initially flexed to some degree, willvary the effective length of the bar 55 to a greater degree than if the bar had not been initially flexed.

The means herein described for altering the effective length of the bar 55. is particularly adapted for effecting very fine adjustments of the position of the grinding Wheel and its base 15. The extent of the movement transmitted transversely to the bar 55 by the ring 5| of the eccentric 49 through. rotation of the shaft '48 and eccentric sleeve 53 'keyed thereto can be varied by altering the shape of the eccentric sleeve 53 or by varying the extent of the rotative movement of the eccentric sleeve '53, wherebythe movement of theba'r 55 longitudinally will also be varied.

The operation of the means "for automatically varying the position of the wheelbase f 5 relatively to the inter'r'nediateb'ase support 23 while the work carriage is being moved across the grinding wheel and after the support 23 shall have been moved to adjusted position to bring the grinding wheel l4 into operative pes'itioniby actuating the hand wheel 24 anasnart 25-26 engaging the half 21 on said support '23) is as follows:

The driven reciprocating"carriage "H, through its rack 28 meshing with gear 29, rotates the shaft 30 first'in'one direction'and then inthe other, the rotation in one direction continuing wnne' thecafria'g'e isfbei n g'finoved'in one direc- -tion. The gear 32 on the shaft 30 rotates the gear 33, thus actuating the shaft 34 onwhich said gear 33 is fixed. The shaft 34 has the gear 36 keyed to it and therefore gear 36 rotates the idlergear 31 which meshes with the gear 40, thereby rotating the shaft 4|, beveled gear 46, gear 41, shaft 48 and eccentric sleeve 53. The

eccentric sleeve 53 produces reciprocatingmove- -ment of the ring 5| in directions transversely of ;the bar 55 to which it is connected. The movements are positive, in both directions, whereby the effective length of the bar 55 is gradually varied-during the movements in opposite directions. tAspring steel connector may be'substituted for the bar 55 herein shown, in: which eventthe connectionof the bar to the cam or eccentric bymeans ofthe bolt 65 maybe eliminated. The spring steel connector will. be flexed from the normal :in one directionv by operation of the cam or eccentric during part of its stroke and :will automatically return to normal position during the remainder of the stroke.

Cams of different shapes can be substituted for the eccentric 49 herein shown, and eccentrics -of different sizes can be interchanged. and thus avoid the necessity for interchanging gears on the bracket 35 to vary the speed of rotation of the eccentric as required by the work to be ground. When it is desired to use the grinding machine for straight grinding, and movement of the wheel base 15 on the intermediate support 23 is not required, the eccentric 49 can be rendered inoperative by removing the screw 61 which extends through the lower portion of the bracket 35 into the recess 68in the .sleeve 32'.

Then the sleeve 32 can be moved forwardly in order to move the gear 32 (slidably mounted on shaft 30) out of mesh with the gear 33. The screw 61 is then reinserted so as to engage the recess 69 in the sleeve 32', thus holding the gear 32 in non-operative position.

The adjustment of the cam or eccentric 49 to its prop-er operative or starting position for producing rolls of varying contours or profiles is! obtained by first disengaging the operative connection between the shaft 30 and gear 33 by moving the sleeve 32 forwardly on the shaft 30.

and the.sleeve-3,2" keyed to said shaft. The bar or connector. 55 and means for actuating it here- :in described'j'are designed to function after the grinding wheel and 'its base'have been moved to .roll grinding :position by adjusting. the position of the intermediatebase 23, and only during the "reciprocatory movement of the work carriageto give the desired. contour. to the work. I

a .Changes may be made in details of construc- 5 .tion without departing from the scope of our in- .vention'. v

We claim:

' 1.Agrinding machine provided with means for automatically grinding convex and concave surfaces on the wo'rk,:comprising a machine base, a longitudinally recipro'cable work carriage on the machine base, means for reciprocating the work carriage, a grinding wheel base slidable trans- 'versely on the machine base, a flexible metal bar extending transversely of the-machine and rigidly connected" at one end to a fixed part of the machine base and at its other end to thewheel base, and means operatively connected with the work carriage and engaging said flexible bar .be-

tween its ends transmitting reciprocating movementsto the bar andto the wheel base when the work carriage is being reciprocated, thereciprocating mo'v'ements of the wheel base being in one horizontal plane;

2. A grinding {machine with the work carriage and engaging. said flex- V ible bar between its ends transmitting reciprocating movements to the bar and to the wheel base when the work carriage is being reciprocated,

said means comprising a vertical shaft mounted in the machine base, an eccentric-sleeve on the shaft keyed thereto, and a ring surrounding the sleeve and supported by said machine base, said I ring engaging the flexible bar and being moved will be understood, of course, that the shape of v the cam or eccentric 49 can be varied so as to produce concave, convex or other special forms. Whenever reference is made herein to means for automatically grinding convex and concave surfaces on the work, it is intended that this element include means for forming convex, concave or other specially formed surfaces on the work. In using an eccentric such as shown, the grinding wheel may be reciprocated beyond the ends of the work in order to obtain the desired curve on the work.

It will be understood that the adjustmentof the position of the intermediate base support 23 can be accomplished by means of the parts 24-2'|, as explained, without interference with the means for operating the eccentric 49 because of the sliding engagement between the shaft 39 in a horizontal planeby the operation of said shaft and eccentric sleeve.

3. A grinding machine provided with means for automatically grinding convex and concave surfaces on the work, comprising a machine base,

a longitudinally .reciprocable work carria e on .the machine base, means for reciprocating the work carriage, a grinding wheel base slidable transversely on the machine base, a flexible metal bar extending transversely of the machine and rigidly connected at one end to a fixed part of the machine base and at its other end to the wheel base, and means operatively connected With the work carriage and engaging said flexible bar between its ends transmitting reciprocating movements to the bar and to the wheel base when the work carriage is being reciprocated, said last mentioned means including an eccentric device and means connecting it to the bar, said connecting means comprising a block having a relatively narrow surface in contact with the side of the bar and a bolt extending through said block and the bar and into the eccentric device.

4. A grinding machine provided with means for automatically grinding convex and concave provided with means for automaticallygrinding'convex and concave surfaces on thework, comprising a machine base, a longitudinally."reciprocable w'ork carriage on the machine base, means for reciprocating the surfaces on the work, comprising a machine base, a longitudinally reciprocable work carriage on the machine base, means for reciprocating the work carriage, a grinding wheel base, .a grinding wheel rotatably mounted on the wheel base, an intermediate support beneath the wheel base slidable transversely on the machine base, means for adjusting the position of the intermediate :support, said wheel base resting .on said intermediate support, a flexible metal bar rigidly connected at one end to the intermediate support and at its other end to the wheel base, and means '01)- eratively connected with the work carriage and engaging said barbetween its ends transmitting reciprocating movements to said flexible bar and to the wheel base when the work carriage is being-reciprocated. V

5. A grindin machine provided with means for automatically grinding convex and concave surfaces on the Work, com-prising a machine base, a longitudinally reciprocable work carriage on the machine base, means for reciprocating the work carriage, agrinding wheel base, a grinding wheel rotatably mounted on the wheel base, an

intermediate support beneath the wheel base slidable transversely on the machine basamcans for adjusting the position of the intermediate support, said wheel base resting on said intermediate support, a flexible metal bar rigidly connected at one end to the intermediate support and at its other end to the Wheel base, and eccentrically operated means operatively connected with the work carriage and engaging said bar bethereto, and a ring surrounding the sleeve and supported by said intermediate support, said ring engaging the flexible bar and being moved in a horizontal plane by the operation of said shaft and eccentric sleeve.

6. A grinding machine provided with means for automatically grinding convex and concave surfaces on the work, comprising a machine base, a longitudinally reciprocable Work carriage on the machine base, means for reciprocating the work carriage, a grinding wheel base slidable transversely on the machine base, a flexible metal bar extending transversely of the machine and rigidly connected at one end to a fixed part of the machine base and at its other end to the wheel base, and means operatively connected with the work carriage and engaging said flexible bar between its ends transmitting reciprocating movements to the bar and to the Wheel base when the work carriage is being reciprocated, said flexible bar being normally flexed to a limited extent and said degree of flexing being alternately gradually increased and restored to normal by the said means for transmitting reciprocating movements to said bar.

ALBERT W. WIGGLESWORTH. ELWOOD R. MONS.