US1877505A - Grinding machine - Google Patents

Description

SeP 1932. F. s. HAAS ET AL 1,877,505

GRINDING MACHINE Filed March 8, I930 2 Sheets-Sheet l Se t. 13, 1932. F. s. HAAS VETYALI GRINDING MACHINE FiledMarch' 8, 1930 2 Sheets-Sheet 2 not: or one 25 ent invention should be readily understood 45 66 of Figure 5.

Patented Sept. 13, 1 932 rmannmcx anus Annamaria!) aixmmqsor CINCIENNATIQOHIO, assrenoas'ro I m cmcn'nnn Application n eajil amh 8;:

p This invention relates to improvements in machine tools andes'pecially to improvements in grinding machines; I

An object oftheinvention is to provide improved means for dressing the active surface of a rotating too'l'of a machine tool organization.

Another object of the/invention is the pro- 1 vision of improved means that maybe read i1; positioned for operation on'the active face 0 a grinding wheel to condition same to perform either-a rough grinding operation 'or w a finish grinding operation on a work piece. A further ob ect of the invention is the provision ofa machine tool for simultaneous- 'ly operatin ona plurality of surfaces of a stepped or ormed-work piece including improved: tool dressin -means for dressing or trueing each'step o the rotating tool.

A still further object of the invention is to provideanimproved mechanism for conditioning that portion of a grinding wheel utilized to grind or finishl'a' radius or fillet.

Other-objectsand advanta es of the presby reference to the following specifications considered in conjunction with the accompanying d'rawings forming-a part thereof and it is to be understood-that any modifica-' tions may be made in the exact structural details without departing from or exceeding the spirit of the invention.

Figure 1 is a plan view of a grinding machine embodying-the improvements of this invention. a a

r Figure 2 is a sectional view taken online. 1 22 of Figural. r

Figure 3 is a sectional view takenon line 33 of Figure 1. Figures; is a sectional view taken on line 4---4.of Figure 2. Figure 5 is a sectional view taken online .v 5-5 of Figure 1.. i 7 Figure 6 is a sectional view taken on line Figure7 is a fragmentary plan view of the radius trueing tool disclosed in Figure 5.

Throughout the several views of the drawings similar reference characters. are employed todenote same or similar parts.

GBDIDEBS 'mconroaA'rEn, or cmormurromo, A oonroaa reap. semi so. 434,400; v

A device embodying this invention may comprise abed or support 10 having formed ciprocating work supporting table 13. The tale 13has secured thereon head stock 14 and tail stock 15 respectively supporting centers 16 and 17 for the work piece 18 and thereon ways 11. and 12'for guiding the representing s anie to'the grinding Wheel 19. v

The grinding wheel 19 is secured to a s indle journaled in bearingsQO slidably carriedby thebed 10. Y i

f Heretofore, it has been customary to mount 1 a trueing or dressing tool on some part or portionof'the reciprocable table 13 to dress or true the active surface of the grinding wheel'sothat said surface'can properlyv grind and finishthe surface of work pieces. In

certainiclasses of work such as grinding the bearings and rollportmn'ofa pressure roll 7 used with steel rolling mills or the like, it is desirable to finish grind the bearings and only rough grind the remainder of the roll. This requires the substitution of trueing or dressing tools to correspondingly condition r thesurfa'ce of the wheel; since, to rough rind,"an open or less smooth grinding surace is used whlle to finlsh 'gr1nd a very smooth grinding surface is deslrable. To

obtain the former surface, a trueing tool-in r the nature of an abrasive "wheel or aRoss' dressing tool may be used while to obtain the latter finish a diamond is generally employed. Another difliculty experienced. in

the past, has been the reconditionin of the various stepsofa stepped or'formed grinding wheel when the said wheel-was'e'mployed for simultaneously grinding the plurality of surfaces of'a stepped work. piece or the like since for production grinding it isnece'ssary to maintain a definite relatlon-between the 1 various faces or steps of the wheel. By this invention a plurality of dres'sing or trueing.

toolsare provided, one of which may be used for preparing the surface of the "grinding wheel for-rough grinding while the other may be; used for preparing the said surface for finish rinding, or the tools maybe used individual y fordressing'the individual step faces of a formednor stepped wheel; Furw ther the tools are so related andadjusted one to the other to maintain the predetermined fixed relation between the steps and the adjustment is made but once and that at the time the machine is being set up.

The active surface of the wheel is dressed by longitudinally reciprocating the table 13,

to pass the trueing tool or tools carried thereby across the face of the wheel, as is well known in the art, and it is to be understood that a suitable-mechanism for reciprocating the table is included within bed 10. T

The tail stock 15 comprises a housing 21 enclosing the longitudinal axially shiftablesleeve 22 having secured therein the center 17. Secured to the spindle 22 by means of.

cap screws or thelike-23 is a flanged plate 24 having flanges 25 extending therefromand surrounding a reduced portion 26 of the housing 22. The flange is provided with a circular groove 27 inwhich retaining shoes 28 carried by revoluble ring member 29 are received to prevent disassociation thereof counter bore therein to receive a lug on the rotated relative to a plate 24 for bringing- I into operative position any one of a plurality of dressing or trueing tools carried thereby.

from the plate 24. ,The retaining shoes 28 are secured in place by locking screws 30 that extend through the ring 29 and. having a said shoes 28. This ring 29 isadapted to be To look the ring 29in its various adjusted positions it is provided with a spring pressed plunger 31 having an operating knob 32 cooperating with notches 33 and 34 formed in plate 24. i

As shown in the drawings the ring 29 supports two dressing ortrueing devices, one a diamond 35 for, operation, on the large step 36 of wheel 19 or for. conditioning the surface of a grinding wheelfor finish grinding, for example, and the other a rotatable wheel 37, made of suitable abrasive material for operation on the surface of thesmaller step 38 or forconditioning the surface of a grinding wheel for rough grinding, for example,

it is to be understood that, if desired, anynumber of trueing or dressing tools may be mounted about the ring 29 with suitable additional notches such as 33 and 34 to lock the ring in the different positions. The diainond 35 is adjustable through a guide sleeve or the like 39 and secured in position by set screw 40. Thef'diamond'point may be adjusted to bear the samerelation with respect to the active surface of the trueing wheel 37 as the difference in radii of the large and small steps 36 and 38,of grinding wheel 19.

I Bfy this construction the surfaces 36 and 38 he grinding wheel 19 may be maintained in proper relation one to the'other for correspondingly successively grinding the sur-' faces of a pluralityof work pieces since by merely withdrawing plunger 31, after one of the steps has been trued and rotating ring 29 the other trueing tool maybe brought into portions thereof which fillet'is ground or finished simultaneously with the finishing of the various portions of the work piece. To dress or true the active surface of the fillet or corner 36a of the large step 36 of the grinding wheel 19; the followingmechanism is provid ed A housing or bracket 47 is secured by means of screws 48 or the like to the housing of the tailstock and is provided with an en-, larged sleeve .49. L through the sleeve is a shaft 50 secured therein by set screws 60 and the shaft supports on'opposite ends thereof theinner races of anti-friction bearings 51 and 52 The outer races of these bearings are respectively secured to and enclosed within the'sleeves 53 and 54 in turn secured in bores formed in arms 55 and 56 of the forked end 61 of the oscillatable member 57. The oscillatable member 57 has extending therefrom intermediate its ends an actuating handle or lever 58'and adjustably carries at its upperend a diamond 59. The diamond 59 is secured in a sleeve 62 adjustable through ailcollar '63 formed on the end of oscillatable member 57 and the sleeve may be secured-in its .adjust able positions by a set screw 64. To limit the oscillations of the member '57 through a definite arc the sleeve'49 is provided-fwith a lug 65 through which an adjustable--'-abut-.

ment screw 66 extends for engagement-with one side of flange 67 integral with the oscillatable members57 for limiting the oscillation in onedirection. The'other side of the flange 67 abuts with a second adjustable abutment screw 68, carried by the bracket 47, for limiting the oscillations in the other direction. The relationship of diamond 59 to the other trueing tools carried by ring 29 is such that upon completing the redressing operation of surfaces 36 and 38 the lever or handle 58 might be. actuated :to swing oscillatable member 57 about the axis of shaft 52 to round u the corner 36a of surface '36.

- To ad ust and set the diamond 59 for con-- ditioning the corner of the wheel to grind a fillet of a predetermined size the 0scillat able member 57 is provided with a-boss 69 having a finished face 7 0 formed thereon cooperating with a gauge 71 shown in Figure 2.

The face 70 is a known distance away from the axis of shaft 52, for example, an inch and a half, and the-gauge 71 has a finished face 72 that engages the said surface or face xtendingcentrally raw-,roa

70 and the gauge extends adjustable upward above the diamond 59. Now if'the diamond 59 were adjusted so that its point engaged the i said face 72, upon oscillation of the member 57 the corner 36a of wheel 19 would be conditioned to grind a fillet having an inch and a half radius. To form and condition the said corner 36a to grind fillets of different radii the gauge 71 is provided with a plural; ity of faces 73 above the face 72 which are stepped back a given amount and if the diamond point were brought into engagement with any one of them, the radius of the fillet would be as much less than the original radius as the particular face 7 3 being employed is offset from the face 72.

From the foregoing description it will be noted that a compact trueing structure has been provided for successively and expeditiously trueing or dressing a plurality of surfaces on a grinding wheel and preparing same for additional use without destroying the relationship between the various surfaces of the wheel. Also it will be noted that the face of a grinding wheel may be conditioned to perform a rough or a finish grinding operation on a work piece.

WVhat is claimed is:

1; In a grinding machine the combination of a grinding wheel having a plurality of circumferential active surfaces, a work supporting table adjacent the grinding wheel, a tailstock carried by the table, means carried by the tailstock for supporting a plurality of trueing tools one for each face of the grinding wheel includinga revoluble ring means for preventing disassociat-ion of the ring from its support and means locking the ring in its various adjusted positions.

2. In a grinding machine the combination of a grinding wheel having a plurality of .-circumferential active faces, a tracing and dressing tool support adjacent the grinding wheel comprising a plate having a circumferential groove therein, a ring coaxial with the plate and overlying the groove, shoes carried y the ring and received in the groove to prevent disassociation of the ring from the plate, a plurality of dressing tools carried by the ring one for each active-face of the wheel and means for locking the ring relative to the plate to position the dressing tools relative to their respective faces.

plate to position the dressing tools relative to their respective faces, said means comprising a spring pressed locking pawlcooperating with notches formed in the plate.

4. The combination with a grinding machine including a grinding wheel having a peripherally operative surface and a work supporting table disposed in opposition thereto, of a tail-stock carried by the table, and a train mechanism for the grinding wheel carried y the tailstock including a ring rotatable about an axis substantially parallel with the tailstock having a plurality of truing de vices projecting peripherally therefrom whereby the truing devices will be alternatively positioned in operative relation to the grinding wheel upon rotation of the ring, the alternate tool being simultaneously shifted into a remote inoperative position, and means for locking the ring at selected stations to insure proper relative position of an individual truing tool with respect to the periphery of the wheel to be opera-ted upon thereby.

In testimony whereof we aflix our signatures.

FREDERICK s. HAAS. BERNARD A. KEARNS.

3. In a grinding machine the combination of a grinding wheel having a plurality of circumferential active faces, a trueing and dressing tool support adj acentthe grinding wheel comprising a plate having a circumferential groove therein, a ring coaxial with the plate and overlying the groove, shoes carried by the ring and received in the groove to prevent disassociation of the ring from the late a plurality of dressing tools carried by t o ring one for each active face of the wheel, and

means for locking the ring relative to the v

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