US2381572A - Control mechanism for honing machines - Google Patents

Description

H. J. CALDWELL 2,381,572 CONTROL NEcHANIsM FOR HoNING MACHINES Aug. 7, 1945. j

Filed April' 1:5," 194s 4 Sheets-Sheet 1 Aug. 7, 1945. H. J. CALDWELL 2,331,572

CONTROL MECHANISM FOR HONING MAHINES I F Filed April 194s 4'sheets-,sheet 2 Aug. 7,1945.

H. J. CALDWELL CONTROL MECHANISM FOR HONINGl MACHNES Filed Aprill 15, 1943 4 sheets-sheet s Aug. 7,1945. H. J. -CALDWELL CONTROL MECHANISM FOR`IHONING MACHINES Filed April l5, 1943 4 Sheets-Sheet 4 wrs sloL-z uw, www@ N ,M www NW Patented Aug. 7, l1945 chine equipped withcontrolmechanismy OFFICE "CoNTRoL MECHANISM Fn KONING "ffH'arry J. Caldwell, Rookffora, `111., assigpor to kyBarnes Drill Co., Rockford, Il l. a corporationof Illinois, l

Application April 15, 1943, serial No. 483,111

l(Citi- 34) 14 Claims.

Y Thef'invention relates to honing machines and In re particularly to improved control mechanism v for such' machines.

Onefobjectgof the invention is to provide imyprovedlcontrol mechanism for automatically controlling the operations ,of la honing machine such asy the relative reciprocation' of the tool landwork, 'the expansion and contraction ofthe tool and the disassociation offthel tool and work at'-thel termination of the honing cycle, which mechani'snifis jsimpler construction, less Vexpensiveto lmanufacture and easier to maintain in proper operatingcondition than the control mechanisms heretoforeaviiable. i

*Another object is toprovide control mechanism of the" above general character which'can be adjusted .very quickly and easily for 'any class of workvwithin the capacity of thermachine.

Still another object is to provide reciprocation `controlling mechanism particularly suitable for honing machines adapted to be driven selectively to traverser the toolfthrough either long Aworking strokes of uniform length.. .Y Aiurther object -is rto provide control mechanismfoperable'to concentrate the action' of the honing toolatany `selected area of the work to or short )removehigh spots, ltaper or other localized irregularities.;

vOther .objects and advantages ofthe invention will become.apparentfrOmr the following detailed description of the ypreferred embodimentv illusltratedinnthe accompanying drawings in which:

VFigure l is a perspective view of a honing vmaembody- ,i

ily applied to other types of honing machines as KVI'wellf'astovothercomparable machine tools. It

."willfalsobe understood that various modications 'and-adaptations maybe made intheform, construction and arrangement of the parts of theim'- ,/proved control mechanism without departing from thespiritand scope of the invention as Fig. 2 vis a sectional view taken in a vertical plane substantially on` the line 2-2- of' Fig.' l

vs howingdetails of the improved control mecha- .,nismp.- v f y f 1 Fig. 34is a sectional view taken in a horizontal plane substantially on the line 3--3 of Fig. 2. f \Fig.'4 is a front View ofthe control mechanism. Fig. 5 is a sectional view taken ina horizontal fpianesubstanna11yon the 1in@ sf-s of Fig; 4.

Figf 'is a'view partly in section 'takerri'n'v a vertical plane substantially on the line 6 6 of Fig. ,7 'is'a diagrammatic view showing theposiof an operating cycle. l

tions of Atno. control elements at the termination u Fig. 8 is a 'diagrammatic view showing the prosil `tions of the control' elements at the beginning of an operating cycle but before the tool and' work .are operatively associated.

expressed'by the'appended claims.. Y

" Ref'er'ring to Figs. 1 and 10 ofthe drawings, the machine selected to illustrate the application ofthe'invention comprises a hollow, vertical coliirnnfiflv mountedon a base I2` and having on its 'front face apair'offparallel guide members I3 l'forming a guideway for a vertically reciprocable tool'isupport orlhead I4. The head, in this instance, isequipped with a single rotatable spindle I5 `which carries a conventional internal honing tool I6 atl the end Voan elongated tubular driver I'I. A motor M (Fig, 1 0) mounted in the column` IIfis 'arran'ged'to drive the spindle through the 'medium ofjasplin'ed shaft I8 and suitable gearing IQ, a part of which is enclosed in the upper end of thejcolumn and theremainder of which is enclosed inthe head III.r l

An adjustable work table'20, mounted on the "fmachine base below the head I4, isadaptedto support "a workpiece W, such as a, cylinder, in posi- "tionto'loe operatedon by the honing tool I6. In the particular machine illustrated, the honing operation is-Iperformed by rotating and simulta- Aneously'reciprocating Vthe tool while the workv is held stationary. 'Reciprocation of the `tool is effected`, in this instance, by pressure fluid 'actuated Ajecting fro'muthe rear of the head.

Pressure uid is supplied to the cylinder 2| by a pump' P driven vby a motor M-I herein shown as connected in a parallel circuit with the spindle j driving motor M; The pump is arranged to draw `fluid'irorn a reservoir R and-to rdeliver it under pressure by'way of a ductA 25 to a two-position reversing valve V which directs the fluid selectively to either the upper or lower end of the cylinder wh'ile connecting the other end of the cylinder to well-known manner to expand and contract the honing tool I6. The delivery of fluid to the action valve V-I.

adapted to be shifted to a tool expanding position by solenoid SOL-I v atively connecting the shaft 3I with the head. In

the exemplary form of the mechanism, the connecting means .comprises an endless chain 35,

vrunning over a sprocket wheel 3B, splined to the shaft 3|, and a second sprocket wheel 3l (Fig. rotatably supported in the upper end of the v machine column. The sprocket wheels are positioned so that one run of the chain is substantially f parallel to the lreciprocatory path of the head and tuator 21 is controlled by a conventional two posi-Y `The invention provides control mechanism of 'ordinarily begins with the head -in a retracted position and the tool contracted and withdrawn a substantial distance from the work.A Upon manipulation of a cycle s'tarting control device,-in this instance a push button actuated switch' S (Fig. 10), a relay Ris energized to close a switch `R--I I' and thereby completev a current supply cir.-

cuit vfor the motors M and M-L The relay also `closes a switch R-I 2 to complete a holding circuit for itself. This circuit includes an automatically operable stop switch S--I, an inching switch S-2 and a manually operable stop switch S-3. The relay R is maintained energized andthe motors continue to run after the starting switch-is released. i; l y

Coincident with' the starting of the pump motor, the head I4 is shifted downwardly tocarry the tool I6 into the work., As the tool enters the work the control mechanism acts to shift the valve V-I to expand the tool and thereafter actuates the pilot valve PV periodically to cause the tool to be traversed repeatedly in a working stroke from oneend of the work to theother.` .After a predetermined interval or a predeterminedtnum- `ber of working strokes, the tool is contracted by appropriate actuation of the valve V--I and then is withdrawn from the work byfshifting the head one of the chain links in the parallel run isl securely anchored to a rigid arm 38 projecting rearwardly from theV head. The reciprocatory movemen-ts of the head are thus transmitted through the chain and the sprocket wheel 36 to the rockshaft 3I and to the controldisk 3D mounted there- `side-.ofthe flange is a cam lug 42 (Figs. 3 and 6) adapted tocoact with a follower 43 carried on one arm of the bell crank lever 44 supported by a pivot pin-'45 on an extension 46 o'f the bracket 33. The

other `end' of the lever is connected by a link 4'! anda rod 48 withthe actuating member of the pilot valve PV. A spring 4S secured at one end t0 :the lever andat theother end to a stationary part of the supporting structure urges the follower againstthe cam. The arrangement is such that the spring tends to shift the pilot valve into a position to eiect a downward movement of the head.

`suitable dogs including a lower limit dog 50 and an upper limit dog 5I. The dogsarel adjustably securedin a circular T-slot 52 in the face of the disk and are arranged to project radially beyond the edge of the disk for alternate engagement with a forwardly extending nnger 53 formed on a radial arm `54 rigidly anchored to the flange 4I tions required to produce the operating cycle above described. mechanism `comprises ,a control member herein shown as a circular disk'30 adapted tobe oscilla'ted or rocked rst in one direction and then in the other direction in timed relation to thereciprocation of the head I4 and through' an arc accurately proportioned to theA range of movement of the head. To this end, the disc is fixed on the outer end of the rockshaft 3| operatively connected with the head. The shaft is journaled yin a bearing 32, carried on a bracket 33, located in a recess opening in one side of th'e machine column. As shown in Fig. 2, the bracket is attached to a frame member 34 which may be bolted or otherwise removable secured to the column so that the entire control assembly may be installed in or removed from the recess as a unit for convenience` of assembly and `maintenance. having-a circular opening or'window alined with A cover plate 34" In its preferred form, the.4r

of the cam sleeve.

s In theinitial downward movement of the head at...the` beginning of an operating cycle, the cam lug 42 and arm 54 occupy the position shown in Fig, 8v while in subsequent downward working strokes these parts occupy the position shown in `Fig..9. `As the head approaches the `end of the downward stroke, the dog 50 engages the linger 53 to swing the arm and cam lugto the position shown in Fig. 10, thereby shifting the pilot valve `to reverse the direction of movement of the head. As the tool approaches the upper end of-theworking stroke, the dog 5I engages `the finger 53 and shifts the cam lug to the position shown in Fig. 9

'to interrupt the upward movement of the head By., reason of their adjustablemounting, the.

disposed substantially at right angles to therod 8i and ,projecting at the -frontyoflthe machine. An eccentric pin 81 (Fig. 5) ontheinner end of the` shaft engages in a peripheral groove in a collar tls-fixed on the rod. l Rocking movements ofthe shaft 86 are thus effective to shift the rod endwise and thereby move the associatedclutch actuating elements toclutch engaging position.

VWith the above arrangement the clutch teeth maybe engaged to couplethe rockshaft and the cam' sleeve in any selected position of `the head. In other words, the coupling may be eiected to initiate short-stroking" at any point in the range of travel of the tool and, consequently, in any selected area of the workpiece upon-.which the tool is operating. Since the cam sleeve .responds directly tothe movementsV of the` head when coupled with the` shaft,k and the; pilot valve is reversed atvery short intervals, the-reciprocation ofthe head is confined within relatively narrow limits. As the valve operation is determined by the movementsv of Vthe head, the. length of the strokes imparted thereto'will remainnuniformrat all times. v'

It will be apparentfrom thehforegoing that the invention providescontrol-mechanism of novel and` advantageous construction particularly suitable-.for use with honing machines and comparable machine tools.k The mechanism isextremely, simple in constructionY and consequentlyl inexpensive to manufacture andeasy to maintain in proper operating condition. AAdjustment ofthe mechanism for diiferentclasses of work is yeffected` lwith `the -utmost Nrconvenience by merely shifting a set of controldogs with reference to a graduated scale on a conveniently accessible; control disk. The `invention also provides a-novel control mechanism whereby selected areas of the work. may be short-stroked-Ttoremove high spots, taper-or other irregularities. eration. the toolystrokes are maintained uniform without -any elort'on the part ofithe operator, thusinsuringaccurate finish'of the work.

Iclaim as my'invention: y' l Y' 1." The combination'in a `honing machine havingtool and work supports'one of .which is Lrecip rocable by power?actuated*meansjof` control mechanism for the lpower actuated: `means including, a shaft rocked `in timed'relatio'nfto'the movements of thev rec'iprocable` support, a control member having'a hub portion rotatably mountedon said shaft formovement between two alternate positions,=said:member beingopn` erative in oneposition to initiate movement of the reciprocable support in one direction and inV the other position to `initiate movement of `the support in the opposite direction, afdiskd-lxedV on said shaft adjacent said control member, a pair of radially kprojecting dogs mounted on said disk, and av radially extending arm rigid with said control member having a ringer projecting forwardly at one side of said disk for engagement by said dogs alternately whereby the member is shifted between its two positions,said dogs being adjustable with respect to eachother to vary the Inv ithis op-l tiatemovement ofthe support iny the. opposite direction, a control member mounted `fol'cvvardly of said cam member and oscillated about .an axis coincidentwith the axisvof rsaid cam member in timed relation to `thelreciprocation of the support, a pair `of radially projecting dogs adjustably mounted onthe -front face vof saidrcontrol member, ,and an arm rigid with said cam. member having anger projecting forwardlybetween said dogs for `alternateengagement ,thereby in the oscillation of the control"member/whereby to rock said cam member between said two, positions.

3. In ahoningmachine, in ,combination a support for a honing .too1,a. pressure iiuid operated operated actuatortfoperative to` shift one of said supports toward and from 'the-other support, a second valve for controllingltlieadelivery of pressure fluid to theI lsecond actuator, control mechani'sm including a shaftadapted to be rockedrst in onedirection and-then-in the other vdirection in timedy relation withr the movements ofsaid one support, ,a `control "member loosely y,mounted on saidshaftand'having cam Velements effective to shiftsaid valves, and-dogs mounted on, said shaft 30, operative to impartfthev-movements -of `the shaft 5. tracted.

. 44. Y Ina .honing machine, in` combination, a support for avhoningtool;powerfactuated meansl on said support for; expandingand ,contracting the tool,-f;a-wsupport;for. work to beI operated. on `by 4the 4o tool; a secondpoweractuatedmeans adapted to shifteoneoffsaid supports `toward and-,fromA the othersupport',`,ashaftadapted Atoloe rocked iirst in.l one direction i and; then; in the4 other direction in; timed A'relation-,with themovements of; said onel .l, supporti-a sleeve memberlooselymounted `on said.

shaft haying oneqcamlement yoperative .to control said4 -firstfpower actuated 4means and another cam;,element `;operati-vegtoy control said second power actuated means means Y for imparting the `movementoif,isaid fshaftftosaid `sleeve member 'including'fa control; disk .fxed on ,said shaft, and a-pairgof: @dogs vmounted on. said diskllfor individual-adjustment relative .toyeach othery Vand to said cam elements.to determine the range of movement fof saidqonexsupport ,andv to time the expansionrrandI contraction of the tooly With re- SpECt,theretQ--;sf v t," i y 5.@ In` ahoning-machine, in; combination, a support :fora honing tool.,E power actuated means on said-support for expanding and contracting the toolfaysupport forworktovbeoperatedpn by the tool, afsecondpower actuated means ;adapted to shift; one offsdfi'suplorts toward and from the other support, .acontrol member adapted` to be other directifll,A in. .timed relation with the ymovementsbf said; onefsupportcam meansfor con trolling;the extenty and directionof movement of saidu one .supporty by ,said 3second power actuated meansgsaid cam; meansv additionally acting to 4 rocked ,--irstuinone; directiony andthenin theone ,support andytoV :time rthefex-pansion and: con--l traction;otlthe'toolwitlrrespectthereto;A i A 6. In ahoning machine; invcoinbination-,ifazsupport for ahonng Atool;'a.s1.1p1sxort foriwor'k tof-be operated on. by the ftooLfpowe'rl ac'tuated'means operative f tof.y move `one :of fsaidnzsupportsatoward and fromxthefoth'er ssupport; controlmejansfor ansangleproportioned totnerangefof movement said power actuated-meansiineludingi acam niember adapted? toi be: yrockedbetween two .positions to' control the direction off-movement fof said'r one supportatieontrolf member adapted to 'be rocked about r a' common 'axis withesaid cam. member' iinv timed- `'relation'. with Si thej movementsf'fof: :said one support,` atpaizr of yradiallyprojectingf dogsmounted i' onl said' @control ffm'ember, an -arlm rigid with said .camr member? alternately engageable by saiddogs whereby saidr camy member is vshifted between its. twofjpsitionsganddetent means frictionally engaging said cam'member to hold .it in either shifted position. y

7. In a honing'machine having tool and work supports one of which is reciprocable by power actuated means,r control `mechanismr` for ,said power actuatedv means comprising, Iin combination, a rotatably supported shaft, means operative to rock said shaft first in onej direction and then in the other direction in timed relation to the movements of said one support and through an angle proportioned to the extent'of movement y of the support, a control disk fixed on said shaft, a control member supportedv for rotation about the axis of said shaft, means actuated vby said member upon rotation through a relatively small angle to control the direction of movement of said Aone support, a radially projecting element rigid with said member,1a pair of radially projectingdogs mounted on said disk inv position to engage said element alternately. and thereby impart rotative controlling movements to said member, said dogs being spaced apart to define the limits of the Working stroke ofvsaid one support, and means operative to establish a direct driving connection between said shaft and said control member whereby the movements of said head are confined within a range substantially shorter than said working stroke.

8. In a honing machine having tool and work supports one of which is reciprocable by power actuated means, control mechanism for said power actuated rmeans comprising, in combination, al rotatably supported control 'member adapted to be rocked through a relatively small angle to control Vthe direction of movement of said one support, a second rotatably supported control member adapted to be rocked through an angle proportioned toy the range of movement of said one supportand in timed vrelation therewith, control elementsmounted on said second member inspaced relation engageable alternatelywith said first member to rock the latter in opl posite directions and thereby confine the movements of said one supporthwithin a predetermined working range, and other means for establishing a direct driving connection between said members whereby to confine the movements of said one support withinr a substantially shorter range.

9. In a honing machine having tool and Work rsupports', one of which is reciprocable by power actuated means, control mechanisml for said power actuated means comprising,V yin combination, a rotatably supported control member adapted to be rocked throughv a relatively small angle to control the direction of movement of said one-support, a lsecond Irotatably supported contra-member adapted.: to be rocked-'through of said .one support and inI timed relation'.Stiller-e-` with,kv control'elements mounted-A` on sadfsee'ond member inspaced: relation` engageablev alternately withl said first' member to rock the latter insopposite directions and thereby /coniine the'y move# ments' of saidronesupport'withinfa predetermined working range; clutch means engageable `toidriv-y member is :adapted-Pto respond# directlyto-tne movements i of saldi 'one support andi thereby lcon"- fine such movements within a narrow-rangegand means operable manually to engage sa-idfclutch means: at anyselected-poiiit rin the" 'working range of said*one-support.by 1 Y i 10. Mecnanismrorcontrolling thefreoiproea.

tion r of a machine element comprising, m 1' roombination, a shaft adapted to be rocked i'lrst in one direction and then in the other direction in timed relation with the movements of the machine element, a first control member fast on said shaft, a second control member journaled on said shaft, a pair of dogs mounted on said rst member in spacedrelation, means 'on said second member adapted to be engaged alternately by said dogs to shift the v4member between two control positions, a clutch Aelement supported on said first control member for movement axially of the shaft, a cooperating clutch element on said second control member, 'spring means yieldably urging the movable clutch element away from the other clutch element, and means .operable manually to shift the movable clutch elementinto engagement with the other clutch element and thereby establish a direct driving connection between the` shaft and said second control member.-

11. Mechanism for controlling the reciprocation of .a machine element comprising, in combination, a shaft adapted to be rocked first in one direction and then in the/other direction in timed relation with the movements of the machine element, a first control member fast on said shaft, a second control member rotatablyy supported on said shaft, a pair of dogs mounted n said rst member in spaced relation, means on said second member adapted to'be engaged alternately by said dogs to shift the member between two `control positions, a clutch element carried by each of said control members, and

vmeans forl engaging said clutch elements to eson said second member adapted to be engaged alternately byy said dogs to shift the member between two control positions, and other means operative to establish a direct driving connection between said shaft and said second control member. f

13. Mechanism for controlling the reciprocation of a machine element comprising, in .combination, a control member adapted to be rocked rst in one direction and then in the other direction through an angle proportioned to the, normal range of movement of the machine eleits normal range.

1 14.Y Mechanismfor controlling the reciprocation' of`a machine element. comprising, in combination, a control member adapted to be shifted rst in one directionand then in the" otherdirectionthrough a .range proportioined Atothe nor'- mal range of movementof the machine elementI and in timed relationto sucli'llmovement, a second control member adapted to be shifted in the same direction as said rst member but through a substantially shorter range, vmeans actuated by said second control member in its movements for controlling the direction of movement of the machiner'elemenhspaced dogs carried by said rst memberv operative alternately to shift said second .member as the machine element approaches the limitsof its normalrange of reciprocation, and means-:operable to couple said second member ydirectly'to said rst member for movement therewith, said ysecond member operating to confine themovements ofthe machine element Within a range substantially shorter than its normal range'of reciprocaticn.

' HARRY J CALDWELL.

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