US2626534A - Diamond boring machine - Google Patents

Description

Jan. 27,1953 M. H. ARMS ETAL DIAMOND BORING MACHINE 5 Sheets-Sheet 1 Filed Sept. 30, 1947 Inven OFS MertFn H. Arms Leon J. Bernard "A pp:

5 Sheets-Sheet 2 Inven ors Mer't-IS'n H.Arms Leon J. Barnard M. H. ARMS ET AL DIAMOND BORING MACHINE Jan. 27, 1953 Filed Sept. 30, 1947 Jan. 27, 1953 M. H. ARMS ETAL 2,626,534

DIAMOND BORING MACHINE I Filed Sept. 30, 1947 5 Sheets-Sheet 3 Invent???) MerC'cTn H.Arms. lion \lBarnord Jan. 27, 1953 M. H. ARMS ET AL 2,626,534

DIAMOND BORING MACHINE Filed Sept. 50, 194'? 5 Sheets-Sheet 4 r is 1 I i 1 l m; :01 v 1| :0 l I l =a= I n 5 I l l A w l l l 1 l i InventFrs Merm Arms Leon Barnard Jan. 27, 1953 M. H. ARMS ETAL DIAMOND BORING MACHINE 5 Sheets-Sheet 5 \Filegl Sept. 30, 1947 W n n W m B In mm r ee M w W Patented Jan. 27, 1953 DIAMOND BORING MACHINE Merton .H. Arms and Leon .J. Barnard, Springfield. Vt... assignors to Bryant chucking Grinder C ona y, Sp n l Vt, a or ora on o Ver- .mont

Application September 30, 1947, Serial- No. 7%;892

.1 This invention relates to diamond boring machines, and has for one'object to provide improved means for relieving the tool from the work-preparatory to withdrawing it so that the surface of the bored hole shall not be scoredas the tool is withdrawn.

moun n Flurther 7 objects and advantages will appear from :a description .of embodiments of theinvention shown in the accompanying drawings in which Fi ure 1 is;. frontelevational viewof a boring machine emb y ng the. invention.

;;Eigu r e- 2 is a iragmentary View toa larger scale partly in fron elevation and par ly :in Vertical section.

l igures 3, 4 and 8 are detail sectional views on the c res ond n y numheredi'se ion zl esof Figure 2.

Figure 51is a detail-sectiohalview through the n her/and h Wor a jacent to the .tool.

Figure .6 is a detail sectional view on line 6-;6 ofl ligure 3.

Figure '7 is a detail sectional view on line 1 -11 ofFisure-S.

f u e 9 i a :frasment y riewzpa ly n elev tio and p rt roken away showin a. modification.

-E igurei 10 .is a diagrammatic viewer the hyidrau i rs s em of the ,Lmachine for ro ating the $00. ar-and I e v ng it for withdrawal.

Figure llpisa'fragmentary front elevationof a -,boring :maohine showing a modification.

'Referringfirst to LFiguresl to 7,v the boring "machine nomprisesaxbed I having a ..pairxf spaced side members '2. and'3. The top member 4 joins the side members land 3, and between these side members .and nearer to theimember .2

than the members, this top member is provided the cylinders, and. the barefi-nacts as .a. hydraulic plunger which. is moved axially bynthe introduction and dischargeof hydraulic fluidiinto the outer .ends of thecylinders l as through ports .8.

,An adjustabl istop .Qis threaded through .a stem It having a flange ell at'itsouter endisecured to the head ofueach \cylindenwas .byscreyvs i2, and this stop may icontact with-an abutment is .seated atthe base ,ofasocket M in the adjacentv end of the bar 35. sImpingementof .theabut- .ment A 3 on the Step9 limits the inward motion ,of .the :bar .6 within each .ofv the icylindersfi The stop ;,,may be accessible for adjustment throu h the outer end of the stem 13, andapipe piug-j 5 threaded into the outer end of this stem normally :holds .the abutment .9 inaccessible for adjust- .ment and prevents leaka e escapin from th .stemrm. However, when ne essa y, th p u 1. maybe removed. Inorder t tak upiost mo on in the sto ad ustment t e inn e o thes em is ma b t ansv rse y slot ed as a fii i 11 a t n ue H which ma b fle e tewer the main portion of the stem as by turning ;a screw L8 pa se t e et ou heh th ea e nt theste The b fieuoner a .earriag 31 h carr a :20 b in u ed t t eha at i te va n w screws 2i (see Eigure Z). Fljhe bart roelgable as Well as axially movable in the cylinders 1 and i lar o n and t e ee ee ue eh ula po o of t earr aeeifl .zhay he eter h h dih .as 22 (See Figure adiueteb eeu di -e vert ca si a 2 o th ca ria and whieh s uh e o the u er. ed e of a hatlhwhiehis al e ured ie Ye tiea an u ar adiustmen ut th giae h eid iaeeo the bed ha h an nreli y o Sere 2.5 n seihei hro sh.ehlar edeho s 26 through the zpba it and threaded. nto the -bas Pref r bly. to w em ethnessror o er ion.

the shoe 22 rests upon alseries of .antifriction rolls 30 supported ina casejj and resting upon the upper edge ,ofthe .ebali 2d. Byreason ofgthis. gon-- itrue ion, .iti .eas am tter to. adjust the. Joar i i-s that the carriagert vmay bamored in atrue re ilih a rath re a d ess of any warn hge h bed i whichmayloocur as ,the machineages or i it a be keda itmev s a iall o h bars. This latter adjustment permits borin rofa round hole. at an angle to the axis of the bar ii.

Ar hins over t ca ri 0 he bridsefiz which is secured at its outer idgeson the upper faces of the side frames} and 3. Two of the s e bridges are shown in Figure 1, one, at each .end o t m c n and d in e er. opposite and portions of the carriage 20. The carriageand the bridge support the'workitobe boredandgthe boring tool, respectively, and as shown, the carriage 2|] supports a work holder 35 while the bridges 32 have secured thereto the non-rotating tool holders 36. This is the more usual arrangement, although occasionally the work may be held by the bridge and the tool by the carriage, and a further modification is shown in Figure 11 which will be further described herein. The work holder 35 supports a work carrier 31 within which is fixedly mounted a work piece 38 which is to be bored.

Each of the tool carriers 36 carries a motor indicated generally at 40, and arranged in rotary driving relation to a rotary shaft 4| which constitutes the boring bar and carries a boring tool 42 projecting laterally therefrom adjacent to its free end. The type of motor 40 shown herein is a well known type of hydraulic motor and the speed of each of these motors may be determined by a control mechanism at the back of the machine, similar to that at 45 on the forward face of the machine, in accordance with a predetermined cycle, depending upon the axial position of the carriage 20, as through a plurality of cams similar to the cams 46, carried by the carriage and having their lower edges impinging upon a hydraulic control mechanism indicated by the throttle valve 41 of Figure 10. The control mechanism 45 and the cams 46 control the table motion and limit switches for hydraulic motor control. This arrangement of hydraulic motors and controls for actuating the motors 43 and for controlling the admission and discharge of hydraulic fluid with respect to the traversing cylinders l is old and well known and per se forms no part of the present invention. However, it is believed that the mounting of the carriage and the control of the motors for slowing the rotation of the boring bars and stopping them at a desired angular position, together with the mechanism for relieving the boring tools so that when they are removed from the work they do not score it, are novel.

Means are provided by which, when the boring bar or bars is stationary and with the boring tool or tools in a desired angular position, some portion of the machine is sprung in such a manner as to retract the tool or tools radially from the work face. This is done when the respective tool has performed the boring operation and is about to be pulled back through the work and is for the purpose of laterally retracting the tool from the work face so that during the retirement of the tool it does not score the work face. Two methods of accomplishing this are shown herein.

Referring first to Figures 1, 2, 3 and 4, at one side of the machine there is fulcrumed a lever 50. As shown best in Figure 4, this may be fulcrumed on one of the side frames, as 3, on a bolt which passes through a spherical enlargement 52 on the inner face of the lever 56 and is threaded into the wall member 3, there being a clearance around the shank of the bolt 5| for a considerable portion of the thickness of the spherical portions 52. The upper end of this lever 50 has an adjustable abutment 53 which bears against the side of the bridge 32 toward its upper end. This abutment 53 may be threaded through the lever 50 for purpose of adjustment. The lower end of the lever 56 has bearing on its inner face the rounded outer end of a piston rod 54 having a piston 55 at its inner end riding within a hydraulic cylinder 56. It will be evident that by forcing the piston 55 outwardly, the lever 50 may be rocked about its pivotal connection with the frame 3 and its upper end pressed against one end of the bridge 32 with sufficient force to deflect this bridge so as to swing the tool carrier 36 laterally so that if the tool 42 is arranged in a horizontal plane, and turned toward the lever 50, this deflection of the bridge will serve to retract the tool 42 out of contact with the inner face of the work piece as shown by dotted lines in Figure 5. When hydraulic pressure is released from the left hand end of the cylinder 56, allowing the lever 56 to resume an unstressed condition, the natural spring of the bridge will return it to normal position.

In Figure 9 there is shown another means for springing the tool away from the work face, this means acting upon the tool bar itself and springing the outer end of the tool bar out of its normal coaxial relation with its inner portion. With this arrangement the tool bar 4| is provided with a circular flange 62 outwardly of a bearing 60, the outer portion of which is formed with a shoulder portion 64 with which cooperates a guard 65 to tend to prevent entry of foreign matter, such as chips, or the like. behind the flange 62.

A rod 66 is mounted for axial motion through spaced bearing portions 61 and 68 of the casing 6| and is normally held retracted out of contact with the flange 62, as by a coil spring 69 bearing between the rear face of the bearing 67 and a collar I6 secured to the rod 66. The opposite end of this rod 66 extends into a hydraulic cylinder portion H and may be impinged upon by a plunger 12 slidably guided therein. By introducing fluid pressure within the cylinder H to the left of the plunger 22, this plunger 22 is forced against the end of the rod 66, which, in turn, is forced against the flange '62 eccentric to the axis of the boring bar 4|. This acts to bend the boring bar 4| about the bearing 60, as shown in dotted lines, in a direction to retract the tool 42 radially from the work when it is stationary in the proper angular position. When the fluid under pressure is discharged from the left hand end of the cylinder H, the rod 66 is pushed back by the spring 69 away from the flange 62 and allows the boring bar to resume its unstressed condition which would bring the tool 42 into position to bore the work. The cylinder II is also provided with a piston 15 normally projected into the cylinder, as by a coil spring 16. When the fluid under pressure is admitted to the left hand end of the cylinder H through the pipe 14 to force the plunger 12 to the right and deflect th boring tool out of normal position, it also acts on the piston 15, pressing it to the left and actuating a stop switch at H. The actuation of this stop switch may serve to control a valve which reverses the direction of traverse, thus withdrawing the boring tool from the work.

In Figures 8 and 10 there is illustrated the mechanism for slowing down and stopping the rotation of the boring tool at a predetermined angular position, and for deflecting the boring tool out of its normal position so that it may be withdrawn without scoring the work. This mechanism is shown as applied to one of th hydraulic motors 40 and when there are a plurality of such motors, such a mechanism would be employed for each. At I00 is shown a fluid tank from which fluid is withdrawn by two pumps |0| and I02. The pump |0| is of much larger capacity than the pump I02 and pumps at a higher pressure, such pressures being determined by the relief valve H0 and I020, respectively.

5 During the normal rotation of the boring bar, pressure from the pump IOI passes through a pipe I03 to a valve casing I04 and acts upon one end of a valve plunger I05, driving it to the left against the action of a spring I06 and opening communication between a chamber I01 and a chamber I08. From this latter chamber, fluid under pressure passes through the pipes I09, III] and I II to the hydraulic motor -40, the discharge from this motor passing through the pipe II2, past a valve II3,'through a pipe H4 back to the drain pipe I I5. The motor is now operating at its fast boring speed. The valve H3 is held open by pressure from the high pressure line I I I, passing beneath it and holding it open against the force of a compression spring '5. Pressure from the chamber I01 of the valve casing I04 passes the check valve I and the port and pipe I2I to the upper end of a valve chamber I22 where it acts upon the upper end of a piston valve I23 and holds it depressed against the action of a spring I24 which tends to lift it. This position of the parts is shown in Figure 8.

The valve I 23 has a pin and slotconnection I25 with a lever I fulcrumed at I3I and having a cam follower roll I32, which, when the valve I23 is in its downward limit of motion, is held out of contact with an edge cam I34 keyed to the shaft iI. This edge cam E34 has a notch I35 at one 'part of its periphery, one side of the notch being outwardly extended to form a stop lug I36.

When the boring has been nearly completed, a valve I lil (see Figure 10) is opened to permit the discharge of the high pressure high capacity pump IOI directly back to the tank- I00 through the pipe I42. This immediately releases the pressure in the pipe I03, allowing the valve I05 to move to the position shown in Figure 10 which shuts oif the high pressure from the chamber I0? to the chamber I98. The pressure in the chamber I01 also is relieved so that the pressure in the line I2! bleeds off past the needle valve I45, allowing the spring I2 1 to lift the valve from the position of Figure 8 to that approaching the position of Figure 10, the follower roll I32 riding on the periphery of the cam I34 spaced from the notch I35. This causes the valve I23 to open a communication from the pipe I50, which receives pressure from the low capacity lowpressure pump I02, into the cannelure I5I of the valve I23 through a longitudinal valve passage I52 out through a cannelure I53 of this valve, pastth check valve I55 "and into the pipe IIO. From this pipe Ilil it reaches the motor through the pipe I II but as the pump I02has a relatively small capacity and low pressure, the motor is driven at a relatively slow speed.

In this position of the valve I23, the follower roll I32 is riding on the periphery of the cam I34 and as soon as the notch I35 comes opposite to this follower, the follower is allowed to rise 'into it as shown in Figure '10. This permits the valve l23 to be lifted a little further, cutting oif the cannelure i253 from the check valve it, thus cutting oi the supply of hydraulic fluid from the pump M2 to the motor 49. At the same time a second cannelure it}; of the valve I23 opens communication to the passage iGI from the passage I53, the passage I51" leading to the mechanism for springing the tool 0 rom the work. As shown in Figure 10 this comprises the hydraulic cylinder by which the bridge is sprung. If desired, of course, this could .be, .instead of the cylinder 55, the cylinder Ill .ofFigure .9, .in which :case the boring bar or shaft would be deflected to retract the tool.

As the cam follower roll I 32 is carried into the notch I35, the stop shoulder I 36 contacts with this roll and tends to-prevent furthertur-ning of the shaft 4|. Should the stop shoulder be close to the roll E32 when the valve Hit is opened,

this shoulder may ride by, but when it comes around a second time it will stop. The low pressure is preferably sufficiently low so that the motor would stall at this time even though the fluid-were not cut 011. Thus the power to the driving motor is out on and the rotation of the shaft is stopped. In this position of theparts, also, the pressure in the pipe II-0 being cut off,

the spring N5 of the valve H3 closes-this valve and shuts on the discharge from the motor'40,

thus hydraulically locking the motor in stationary position. The notch I35 is so angularlyrelated to the tool carried by the shaft 4i that when the rotation of thisshaft is stopped, the tool is in such angular position that the springing of the :bridge or the springing of the tool shaftretracts Figure 11 where the work piecezilil is carried in a chuck is! rotatably mounted in thebridgeand rotated by a motor such as the hydraulic motor so heretofore mentioned. The boring bar 202 is then non-rotatably mounted on the carriage 26. With this arrangementno means need be provided for stopping the rotating partsin anyparticular angular position. The boring tool may be retracted from the work either by .defiecting the bridge as heretofore described, in which case the boring tool is fixed to project from the boring bar in the general direction of deflection of the bridge, or the bar itself may be sprung backwardly relative to the direction of projection of the tool therefrom, as by exerting eccentric pressure lengthwise thereon after the manner shown in Figure 9 as heretofore described.

From the foregoing description of certain embodiments of this invention, it should be evident to those skilled in the art that various further changes and modifications might be made without departing from its spirit or scope.

We claim:

1. A boring machine comprising a base,'parts one of which comprises a carriage mounted for reciprocation on said base and the other of which comprises a bridge carried by said baseand-extending over said carriage, a shaft journaled on one of said parts'and extending in the direction of motion of said carriage, aworksupport'carried by the other of said parts, a' boring tool carried by said shaft, power means for rotating said shaft, means controlling said:power- .meansitoffirst slow the rotation of said shaft to. a predetermined low speed and then stop such rotation from said low speed with said tool in a predetermined angular position, and power means controlled by said controlling means for thereupon springing the part carrying said tool in a direction to retract said tool radially from the work.

.carriage, awork support carriedby said carriage,

a boring tool carried by said shaft, power means for rotating said tool, means controlling said power means to first slow the rotation of said shaft to a predetermined low speed and then stop such rotation from said low speed with said tool in a predetermined angular position, and power means controlled by said controlling means for thereupon springing said shaft in a direction to retract said tool radially from the work at the stopped position.

3. A boring machine comprising a base, parts one of which comprises a carriage mounted for reciprocation on said base, and another of which comprises a bridge supported on said base and relative to which said carriage is movable, a work holder carried by one of said parts, a shaft journaled lengthwise of the direction of motion of said carriage on the other of said parts, a hydraulic motor for rotating said shaft, a boring tool carried by said shaft for operating on work carried by said work holder, two sources of fluid pressure one of greater capacity and pressure than the other, valve means selecting the source effective to actuate said motor, means actuating said valve to switch from the greater capacity to the smaller capacity source near to the end of a boring operation to thereby slow the rate of rotation of said shaft to a predetermined low speed, stop. means to thereafter stop the rotation of said shaft from said low speed-with said tool in a predetermined angular position, means for springing said tool radially away from said stopped position when in said position out of contact with the work, and means actuated by said stopping means when in stopped position to connect one of said sources to said springing means.

4. A boring machine comprising a base, parts one of which comprises a carriage mounted for reciprocation on said base, and another of which is supported on said base and relative to which said carriage is movable, a work holder carried by one of said parts, a shaft journaled lengthwise of the direction of motion of said carriage on the other of said parts, a hydraulic motor for rotating said shaft, a boring tool carried by said shaft for operating on work carried by said work holder, two sources of fluid pressure one of greater capacity and pressure than the other, valve means selecting the source effective to actuate said motor, means actuating said valve to switch from the greater capacity to the smaller capacity source near to the end of a boring operation to thereby slow the rate of rotation of said shaft, a cam carried by said shaft and having on its periphery a stop lug and a notch adjacent to said lug, a lever having an arm connected to said valve and a follower roll bearing on said periphery only when said valve is in position to connect said source of smaller capacity to said motor and to then be in position to engage said stop lug to stop the rotation of said tool in a definite predetermined angular position and to engage in said notch, means for springing said tool in a direction relative to its stopped angular position to move the tool out of contact with the work, said valve being moved by such notch engagement to shut off both sources from said motor and to connect one of said sources to said springing means to spring said tool radially away from the work.

5. In a boring machine, a boring bar, a support for said bar, a boring tool carried by said bar spaced from said support, a flange on said bar spaced from said support, and a power pressed element bearing on one face of said flange eccentric to said bar for springing said bar and tool laterally relative to said support to move said tool back from boring position when said tool extends toward said element, said means supporting said element nonrotatable with said bar.

6. In a boring machine, a rotary boring bar, a motor connected to rotate said bar, said bar being unsupported for a substantial portion of its length, a boring tool carried by said bar in its unsupported portion, a flange on said bar at said unsupported portion, a plunger substantially parallel to said bar and engaging said flange, means supporting said plunger non-rotatable with said bar, means for stopping the rotation of said bar in angular position with said tool projecting toward said plunger, and means for pushing said plunger against said flange to thereby spring said tool backwardly.

7. A boring machine comprising a base having a pair of spaced side walls, a cylindrical bar mounted for axial and angular motion on said base between said side walls and nearer to one of said walls than to the other, a carriage member fixed to said bar, a guide bar adjustably fixed to said base inwardly of and adjacent to the other of said side walls and adjustable angularly vertically, a shoe carried by said carriage member and supported on said guide bar whereby said carriage may rock during its motion axially of said bar, a, bridge member supported on said side walls and beneath which said carriage member may extend, a work support carried by one of said members, and a tool on the other of said members for operating on work carried by said work support.

8. A boring machine comprising a base having a pair of spaced side walls, a cylindrical bar mounted for axial and angular motion on said base between said side walls and nearer to one of said walls than to the other, hydraulic cylinders carried by said base and into which the ends of said bar extend to form pistons therefor, means for controlling supply and discharge of hydraulic pressure to and from said cylinders to reciprocate said bar, a carriage member fixed to said bar, a guide bar adjustably fixed to said base adjacent to the other of said side walls for vertical angular adjustment, a shoe carried by said carriage member and supported on said guide bar, a bridge member supported on said side walls and beneath which said carriage member may extend, a work support carried by one of said members, and a tool on the other of said members for operating on work carried by said work support.

MERTON H. ARMS. LEON J. BARNARD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 283,367 Barcley Aug. 21, 1883 1,868,697 Ellis July 26, 1932 1,920,209 Norton Aug. 1, 1933 1,926,967 Blood Sept. 12, 1933 2,023,168 Erling Dec. 3, 1935 2,051,052 Morgan Aug. 18, 1936 2,146,446 Schmidt et a1. Feb. 7, 1939 2,330,985 Meyer Oct. 5, 1943 2,412,038 Freisen Dec. 8, 1946

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