US1728380A - Metal-working machine - Google Patents

Description

Sept. 1,7, 1929. c. E. WALL-ING METAL WORKING MACHINE Filed Aug. 27, 1927 ATTORNEY v. .vh E

Patented Sept. 17, 1929 CLYDE E. WALLING, oF LAKEWOOD, `01.110

METAL-WORKING MACHINE Application yfiled August 27, 1927.4` Serial No.y 215,864. `i

This invention relates to 'metal working machines of the type having relative movement betweena tool or cutter and rotary work and wherein the action of the tool on '5 the work is controlled according to a pattern or templet, and although illustrated in connection with a grinding machine `it is applicable to lathes and cuttingmachines generally. It is, especially applicable to grinding machines of a type adapted for the grinding of taps, reamers and cutters of any kind and of any desiredcutting edge.

One object ofthe invention is'to eliminate the difficult `and laborious settings which the present machines require for turning, grinding and shaping of articles generally.

Another object is to permit easy duplication of a great number of such articles, and especially the resharpening of old or worn reamers, cutters and the like accurately to their original shape.v 'i

Another object is tonearly eliminate the great number of settings thev complicated reamers and the like'required with the present type of grinding machines. f

In. the operation of grinding machines commonly in` use, the grindingof reamers or cutters requires a considerable time in the setting of the machine, and since most tion of the attendant very oftenk the 4simplest of reamers or cutters lack accuracy. In their opera-tion, only skilled labor is used. In connection with special reamers or of their work depends on 'the personal equacutters which have their edges at variabley In--the grinding of taps, reamers or cutters some of them have their edges straight and othersareinv a form of a spiral. These edges have always ysome kind of yrelief which relief'may either be straight, circular u, or concave. In this application the grinding wheel has to be suchyas to produce the kind of relief that is desired to give to the cutting edge of the article, and to roduce the desired grinding edge at the w eel a1device'similar to the one shown in Patent No. 1,143,337y may be usedfbut, this is limmaterial to thepresent invention,`

'In the' presentillustration of the inven tion the grinding `wheel is stationary and the articles to be yground `are?movedjback and forthacross 'thewheel The piecek toy be ground is supported'byy two centers on a sliding bed` and in addition one ofthe centers is movabler upand down to` vary the po-I sition of they edge presented to the Wheel according toa `'cam orftemplet. But itis to be understood'the work could be held stationary and the grinding wheel movedalong the same. Also, instead of being held between centers the'work could be held by chucks, sockets orfany othermeanstof permit rotation thereof. v With thisexplanation, it' will be clear that the `invention is of wide application' and no' limitationl is to be implied from the selection of machine for purposes of illustration.' 1

It' will beappare'nt that inthe present machine, for cylindrical grinding, thewcen'- ters are at exactly the same height from the supporting tableyvvhile aconi'cal' grinding requires the centers to beat different heights'. By means of this machine it is possible to produce by one setting the cutting edges of reamers or cutters ofthe desired shape, and the settings may be varied indefinitely. And this is accomplished by yraising or lowering one'of the piece ksupporting centers,y automatically, following predetermined requirements easily developed in a cam.'y The invention is illustrated in the yaccompanying drawing,in which Fig.y 1 'isa plan PATENToFFics-j f a' particular type `of of the machine; Fig. 2 kis a sidel elevation thereofglfig'. 3 is an endelevation.

f In the drawing,'thepie`ceto be groundis represented atl 1, and one end of this piece is supported by a center 2 which is directly held by the sliding carriage of the machine. The other end of piece 1 is supported by the adjustable center 3 which is in turn supported on the carriage by a swinging center arm 4V and ablock or center base 6 having Va fixed arm60 to which the arm 4 is connected by pivot 5. The arm 4L terminates in a block or stock fo-r thecenter 3 4of ordinary construction. Tlrecent'er base 6 is adjustably held to the carriage y2O by a fastening bolt 13 the head of which is engaged in a T-slot 21 in the carriage. A follower lever 7 is held by screws 8 and 10 to a lever bracket/9 which is in turn'heldfto stock 140 byangappropriate screw 12 engaging T- block Vin-a T-slot inthe` side of the stock l0,perm-itting adjustment-lengthwise of the j stock.` kThe angleof lever 7 may be adjusted bywsetfscre-w 11;, this being vpermitted byga slottedepening'inflever for the screwk 10.

I. A spring 18, connectedy betweenv the 'stock lOfand lthearrn 60, tends 'to hold the adjustable-center Seaty its lowest point' which is limited by an 'adjustable screw'l-G which is tapped through the arm 4 and strikes against the arm lan-d by 'an adjustable yscrew 17 set inthe block Gunder'tjhe stock 40which rests thereon. l

Thelowzer end ofthe `lever 7 is provided witlr a lroller 7.0 which travels along the surface `of a templet or lpat-ternr cam 14 screwed'to a bracket 15 adjustable thereon ina slotl in the-front of the bed or frame 66 which isg-xedythe bracket-'being fastened by a screwf57, Y A cam suitable for the work at hand will bev used,.andmay be changed as desired bythe substitution of-a-nother earn. j Y

l.Thegrinding is donebyfa `wheel which is ixedliinl position tol `contact with the work whichtravels across the wheel. v A

`Infthfe voperation ofl thejrma'ch'ne the bed 66,'bracket 15 and cam 14 are stationary. Thefcarriage or slide 2O isreciprocated by anysu'itable means, fthe workpiece lbeing carried between the `centers which move with the carriage.;

Y he Vrollefrf'() follows the-cam surface and thereby the lever `7 raises-or lowers the center 3 kon th'epivot according to the Vshape of the camfand this raises or lowers one endV fof the lwork soythat 'the-wheel 80-follows the profile of the work. ,'Ifthe work is spiral or has" spiralblad'es may turn onthe centers sothatthe wheel may*` follow the angle ofthe blade.v When one blade is sharpened the Awork-is fturned to present `a ynew blade to the wheel, and lthe carriage is then'rec iprocated'asibefore It will be seen that thelactic'zn` is automatic along each blade which kis ground vto ftheprofile 'determined by the Yselect-ed foam. `The operation therefore involves the Vselection of the proper cam and .the movement of the work back and forth under the wheel, the movable center 3 raising or lowering the end of the work support thereby to shape the work accordingly. As stated above, the work instead of being held between centers may be held in chucks or otherwise, and the chuck or other holder will swing or lift according to the templet to vary the profile of the work. Also, both centers or holders could b'e moved 01""m'ovabl'e, to permit the desired traverse ofthe work. And, also, the wheel or Vcutting tool need not be stationary, but

-could be moved, by appropriate means, with respect to the work.

The invention is not limited to the particular features shown and Vdescribed but the machine may be varied within the scope of the following claims.

l claim:

1. In a grinding machine, ythe combination of a grinding wheel, a reciprocating carriage provided with holders between which the work is held, one of the holders being relatively fixed and the other being movable on the carriage to vary the angle of the work with respect to the wheel, and templet-controlled means to so move said holder as the carriage travels, said movable holder being pivotally mounted on the carriage on anvaxis transverse to the line of movementof the carriage to swing toward and froml the wheel.

Q. In a lgrindi-ng machine, the combination of a relatively fixedr grinding wheel, a reciprocating carriage, a'pair of centers on the carriage, between which the work is mounted, one of said centers being axially fixed relatively to the carriage and the other being movable -to vary the angle of the work'with respect to the wheel, and templetcontrolled means yautomatically actuated by the movement of the carriage to move said other center, the movable center having la support-pivoted on the carriage on an axis transverse to the axis of the center.

y3. In a grinding machine, the combination of Va relatively fixed grinding wheel, a reciprocating carriagefhaving a'xed center thereon, a movable center, a pivot connection between themovable center and the carriage the axis of said pivot being transverseto the axis ofthe center, and templet' controlled means automatically acquired by the movement of the carriage to swing the movableqcenter on its pivot.

4. In a grinding machine, the combinationof a. relatively fixed grinding wheel, a reciprocating `carriage yhaving a fixed center thereon, a moya-ble center, 'a' ypivot connection between the movable center and the carriage transverse to the axis of the center,l and templet-controlled meansfautomatically acquired by the movement "ofthe carriage to swing the movable center on its pivot to make its axis oli-'set to that of the fixed center, the carriage being provided with an arm extending behind the movable center, and the center being provided with an arm extending rearwardly and connected kto said arm by said pivot.

5. In a grinding machine, the combination of a bed, a templet fixed on the bed, a carriage slidable on the bed and provided with a pair of centers between which the work is held, one of said centers being movable, a support for the movable cen'- ter pivotally mounted on the carriage, the axis of the pivot being transverse yto the axis of the centers, a lever carried by said support and projecting in position to follow the templet and swing said center as the carriage moves, and a grinding wheel adapted to act on work held between the centers.

6. In a grinding machine, the combination of a bed, a templet fixed on the bed, a carriage slidable on the bed andwprovided with a pair of centers between which the Work is held, one of said centers being movable, a support for the movable center pivotally mounted on the carriage, a lever carried by said support and projecting in position to follow the templet and swing said center as the carriage moves, and a grinding wheel adapted to act on the work held between ther centers, and a spring connected to the center support and tending to resist movement thereof.

In testimony whereof, I do aix my sig- CLYDE E. WALLING.

f nature.

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