US2475084A - Thread rolling machine - Google Patents

Description

y 1949. A, E. DRISSNER ETAL 2,475,084

THREAD ROLLING MACHINE Filed April 29, 1944 6 Sheets-Sheet 1 6 Sheets-Sheet 2 8% I mm a.. i fl vww a m n u L M... IE w m i I I M i h N mm m W I F H HHHHIHH 1| I m u l n J m I u b m n p mm July 5, 1949. A. E. DRISSNER ETAL THREAD ROLLING MACHINE F1183 April 29, 1944 aw bu on A. E. DRISSNER El AL. 2,475,084.

THREAD ROLLING MACHINE 6 Sheets-Sheet 3 IN V EN TORS, edl'lDfissl-acn Q. 7 v WWW! July 5, 1949.

Filed April 29, 1944 HEEI $710 wqag wf fir Wilma/11L y 1949. A. E. DRISSNER EIAL 2,475,084

THREAD ROLLING MACHINE 7 Filed April 29, 1944 s Sheets-She et 4 i! mgg ed; mmvroas, fl tam-[Hoqg 3 M fiZ-EEonnerl July 5, 1949.

A. E. DRISSNER ETAL THREAD ROLLING MACHINE 6 Sheets-sheaf. 6

Filed April 29. 1944 IN V EN T0R59 E flilssnen 71 55 150170 Patented July 5, 1949 UNIT-ED s'tAT-Es ow-ice Ohio The presentfin irenti on r lat'esjto thread folliiig ""machinesfaridhas for its pri icipalcb'j'ect the provision of-animp1 ovedinachirie wherein the very s'atisfac'toffin *the me i tio b ga'ccdrate work and not accurate enough to produce "a Siflobth, accurate Class thread as demanded "today by the Air'Cofpsjoxaeroplaneparts,"wlif- *as, the preserit iirhpi'bvemez t will pot only meet this machihe fto roll thi'eaiis with "a tolerance of .0005 in the bitchfdia riete a A 4 W --In the pi'esent iihprovenieht, therefore; an 9]0- 'j ect of the ii lve'rition is the'provisioppf an improved iiiac hifie whereby the t rea rolls are an movecl directly a single 'rptary da having "a fel e w n; ur s 'o 'i bmim1 h T 11 'trieieb elimi riating' all linkag'es" ahd' intermediate i a 'still furtherobject of the ihv ri tibn is the prciilision of hydratin opefatihg mechanism for 'irna'cliine which will accurately "control the "cam action or thebafirslid'eis. l s

A sun further object of the 'breserit ny'em' dn is the ij rovision "-0; mechanism hydfia i lic'ally "opfajt d directly "aLiid uniformly to control the op. 'eration aiid s'fieedbi the follsarid which can be at'ijii sted-to siii t'i'diiiriileiits. v A still further object of the inyentio'h is sim- "b lici fiy df desiih lease of operation together 0 with 156 mm ior assuring extreme accuracy, not so far? me on other types f thread iollirig m'achi es, whichwill eriable ine'iig'jeiie'nced 'ob'e'iators to tur'n oiit very accurate w61{k,sbithing very important when iqi aintity production isess'ential ai d skilled l'abor'difliult to obtain. Ih the iiiawi fig s iacoin' oariying a rw ssp. wit F -fuse si esfmma lay-hut of the ox'gerati gpartsof the machirie.

Eig. 2 isa froht View of the machine.

leiiwfi rie l a transverse vertical section taken on m 4-4 of F153;

Rig. 5 is a vertidalsection on line 5-5 of Fig.2. Fig. 6 is a sectional view similar to that shown 3 ment of the cam, hereinafter described, for shifting the rolls to and from the work.

This shifting unit also comprises a flow control valve [3 similar in construction to the valve 9, which valve i3 is provided with a relief valve l4 and control gauge [5. From this control valve |3, the fluid asses into a solenoid four-way valve l8 and thence into the cylinder I1 for operating the piston I8, all of which will be further described in connection with the operation of the machine.

The stroke of the piston I8 is limited by a limit switch l9 which controls a time-delay valve 29 through stops 2|. The switch is supported for movement with the piston rod 22 attached to the piston l8. These stops may be adjusted to limit the stroke of the piston as will be noted hereinafter.

For the convenience of the operator, the machine is provided with a foot-controlled switch 23 so that his hands will be free for loading pieces and feeding them into the machine. A hand control switch 24 is also provided,

As hereinbefore mentioned, in the head 3 of the machine is located the motor 1 adapted to rotate the shaft 24' and this motor and shaft are coupled together by means of the coupling 26 and keys 21. The motor 1 is also provided with a constant displacement fluid pump for controlling the rotary movement of the thread rolls and spindles.

On the shaft 24 is located a worm 28 secured for rotation therewith and adapted to engage a worm gear 29 splined to a shaft 30. On this shaft 30 is a gear 3| adapted to mesh with a similar gear 32 splined to a shaft 33 having secured for rotation therewith at its opposite end a gear 34. The gears 3| and 32 are adapted to be changed when desired, in order to change the speed of the spindles 8 beyond the limit of the fluid motor In the present instance, the gear 34 is surrounded by and meshes with three idler gears 35 mounted on appropriate stud shafts 35' in the housing (see Figs. 6 and '7). These idler gears are double-ended spur gears, the opposite ends of which are adapted to mesh with and drive the three spindle gears 36 secured to one end of the spindles 8 which carry on their opposite ends the thread rolls 38.

The ends of the spindles 8 carrying the tool or thread rolls are supported, in the present instance, in bronze bushings 6|. However, suitable rolls, not shown, may be substituted for these bronze bushings 6| in order to take the pressure of the thread rolls.

Thus, it will be noted that the fluid motor 1 controls the speed of all three thread rolls uniformly and the present construction of spindle drive through the chain of gears referred to eliminates all flexible drives or complicated lever mechanism present in many machines. It will also be seen by reference to Fig. 7 that the idler gears 35 and spindle gears 36 are so located as to permit radial shifting of the tool or thread rolls and their spindles without materially affecting the correct meshing of the teeth of the gears 35 and 36, so that when the slides are moved in toward the work, as hereinafter described, the teeth of the gears will remain in mesh and these gears are so constructed that there is very little play between the teeth.

Where the motor is of sufiicient capacity, making it unnecessary to use the change gears 3! and 32, this motor can be mounted at right angles to its present position in any suitable manner on the frame and a spur gear carried by the shaft 24' may directly engage the gear 32 on the shaft 33. In this construction, the worm 28 and worm gear 29, the shaft 30 and gear 3| would all be eliminated and a more direct drive obtained.

In order to shift the thread rolls 38 toward and from the work, a rotary cam 39 is provided having at its outer periphery, through degrees thereof, teeth 40 adapted to engage the worm 4| carried for shiftable movement on the piston rod 22 attached to the piston IS.

The inner surface of this cam 39 is provided with three cam surfaces 42 adapted to engage rollers 43 carried toward the outer ends of the slides 44. These slides carry the roll spindles 8 which are adapted to be shifted toward the center when rolling a thread in a work piece. The slides are mounted in slide-ways 46 and are provided with a front support plate 45,

The cam 39 is adapted to rotate in the housing and is supported therein by rollers 4'! engaging the outer periphery and these rollers are positioned in line with the slide rollers 43 to provide for easy sliding rotary movement of the cam 39. Actuation of the piston I8 will cause the worm 4| on the piston rod 22 to rotate the cam 39.

As hereinbefcre mentioned, the piston rod has a predetermined stroke in accordance with the setting of the stops 2|, thereby to rotate the cam disk 39 through any desired distance in order to shift the cam slides 44 the correct distance for rolling accurate threads.

The three roller slides, being operated in umson, will cause an even pressure on all three sides of the work and avoid crushing when it is desired to roll threads on hollow parts and also assures a perfect roundness of the thread.

Suitable springs 59 and plungers 60 urge the slides outwardly so that the rollers 43 will always bear against the cam surfaces 42 and these springs and plungers are effective to move the slides in an outward direction when the cam 39 is rotated in a reverse direction.

In machining the cam 39, the three cam surfaces 42, as before stated, are machined identically in order to give a uniform action and movement to the slides 44 so that the three thread rolls will exert an even pressure on the work.

In order to adjust the amount of movement of the thread rolls for obtaining a perfect pitch diameter on the work, a hand wheel 48 is provided to rotate the worm 4| thus changing the position of the cam 39 and, thereby, the position of the cam surfaces 42 relative to the rollers 43 and, therefore, adjusting the movement of the slides 44.

The construction of this machine thus permits the rolling of threads on a work piece to the exact diameter required and also permits rolling of threads on work of different diameters as long as the number of threads per inch and shape of threads are the same.

This machine may be adjusted to handle work from to diameter simply by adjusting the position of the worm 4| through the wheel 48, as before explained. The stroke of the piston is controlled by the stops 2| and these stops are adjusted by means of adjusting rods 49 supported on the gear box and provided with adjusting screws 50 at opposite sides of the machine and adapted to engage switch toggle elements 5| of the limit switch |9 (see Fig. 8). This limit switch IS, in the present instance, is carried on a bracket -52 supported for movement with the piston rod- 22. I

'--Wl '1e'n it is desired to roll fine thread-s, th stroke of 'the'piston It can be reduced and time 'saved by-not opening the thread rolls more than is absolutelynecessary. To this enda stop screw T8 is threaded in the end of the cylinder, as illustrated in Fig. 8, to limit the stroke of the piston and piston 'rod 4| When it :is desired tochange' from one thread toanother having a difierent pitch, it is only 'n'ecessary to change the thread rolls 38 and ad- -*just 'the'fiow cont'rolva1ves '9 and w.

'The work is carried insuitable work chucks and adapted to be fed into the machine in any fsuitable manner and, in the pre'se'nt instance, vvlien' the thre'adrolls contact the work, the work will freely rotate Within the rolls. These roller bhuc'ksxand feeding means have not been illustratedas they form no part of the present invention.

'Thefbase of the machine, as shown in Figs, 2 and =3, "is also provided with the hydraulic oil valvegauge 53 for indicating the amount of oil in the reservoir and at'the opposite side 'of the base an oil valve gauge 54 is provided to indic'ate the' amount 'of 'cooling oilin its reservoir.

The head stock 3 which carries the operating mechanism for the thread rolls has on its face the support 55 for the rolls 41. The hand contro'lle'd switch 24'for starting and stopping the machine may alsowbe carried by the head stock if 'd'esire'd. This-head stock likewise carries the time delay valve 20 for controlling the time movement of'the 'cam. Suitable; strainers 5B and 5! for filtering "the oil are provided, located in the base of the machine. The rotary control *gauge l6 and cam controlpressure gauge I5 are "also located on the 'fa'ceof the head stock.

Suitable splash guards 58 are provided in front "of th thread rolls.

' In-the operation of the machine, the proper thread rolls "38 are secured'to the spindles 8 and the adjusting handle 18 set to control the position of the cam 39 for the'desired pitch diameter of the threadsto be rolled. The cam stops 2| are then set to limit the stroke of the piston "for the desired movement of the cam slides 44. A piece of work is thenfed to the machine and the motor started to rotate the threading rolls and the cam '39 to shift the slides 4'4 inwardly 'to'roll the desired thread.

While this machine has been described as a thread rolling machine, by merely substituting the proper tools for this work, it may also be 1 used 'for burnishing outside surfaces and 'for grooving parts where it is desired that the grooves be "very accurate and smooth, or for other opera- -tions wherethree rolls canbe applied with equal pressure on the work.

It isto be understood-that, by describing in detail herein any particular form, structure or arrangement, it is not intended to limit the invention beyond the terms of the several claims or the requirements of the prior art.

Having thus explained the nature of our said invention and described a Way of constructing and using the same, although without attempting to set forth all of the forms in which it may be made, or all of the modes of its .use, we claim:

1. A rolling machine having aplurality of radiallyshiftable slides, rotatable spindles carried bysaid slides, tool rolls carried by 'saidspindles,

'a rotary cam for uniformly shiftingsaid slides,

meansincluding fiuidcontrolled means and gearing io'r actuating sai d cam, and independent inearis iri'c'l1iding "fluid oontrolled means and gearmgrcr rotating -saidx tool roll :spindl'es, the

gearing for ro'tating th'e spindles-oomprising a --spi'ntiles, "a notaryca'm for unifofmly "shifting said s'li'des, means including fluid controlled means and: gearing-nor actuating said cam-"and independent means -includin'g fluid controlled 'mean-s a'nd "ge'arih" 'for rotating "said tool roll spindles, the gearing-"for r otatin'g the spindles eumpnsm a gear carried by each tool spindle,

Of driVensiJiii' gearspone or each set in mesh with the driven-gear and the otheri'in "mesh with "a *spind1e-gear,- and tlo'e -'gear-in'g for rotating the cam eornprisiii'g tethcar'rie'd by said cam and a fluid actuatedpiston-having. teeth meshing with -s'a id cam teeth.

nroumgmacninehavinga-pluraut of radially 'shiftable slide's; 'rota table spir'idles carried by Said. slides, 17061 rolls Carried by said Spindles, means for "rotatingsaid-spindles, a rot'a'ry' cam for uniformly shi'fti'h'g said' 'slides toward and from each other, -'a reciprocating piston for-rotating the cam, and -mea'nsfor -ad-justing the stroke -o'f the -'pisto'n-- and comprisin adjustable "steps, 'a "switch eon'troned by said st ps, and

.ie'ans 'f or adjusting'the' positionofsa'id stops.

4. rol'ling' machi'ne' liavi'ng a piu rant df radially "shiftable slides, rotatable spindles "carried by said slides, "tool r'olls -c ed by said spindles, -1n'eaIis for rotating saidpindles, a rotary cam for uniformlysliif-ting -s'aid slide's toward and irom-each other, a reciprocatin piston "for rotating' the cam,-a'n'd means fo'radjusting the stroke of the piston --"and-comprising adjustable steps, "a *switch controlled by s'aidstops, and

, means for adjusting-the pos'itio'nof said stops,

Said switch stippoited fol' movement With the "piston.

- 5; Arollingmac'hine having aplura'lityof radial ly shiftable Slides, "rotatable spindles 'Calried by said slides, tool-rolls carrie'd'by said spindles, means for "rotatin *said spindl'es, a rotary cam for uniformly shifting said "slides "toward and from each othe'r, a reciprocating pi's'toh fdr rotating the cam, and means for adjusting the stroke-er "the piston and comprisin adjustable stop's,-a switch controlled by said stops, means for "adjusting the-position of said stops, and 'inea 'n's for "reducing "the -str'oke; 'o fthe piston.

6. A thread rolling-maritime 'liav'ing a-"plurali-ty of "radially s hiftaible "slides, "rotataldle spindles carried by'said slides/tool rolls carried by said spindles, a rotary cam for uniformly shifting said slides, means'for actuating"said cam, andmeans -for rotatipgthe 'spindles'an'c'l comprising a driving gear, a driven gear, a plurality of sets of driven ispur gears, 'one 'of'eac'h set in mesh with the driven gear and the other in mesh with a --'d'rivin'g said driving "gear.

7. A thread rollingfriiacliine having a plurality 'ls i fe aet at n is i ge a a comprising fiu'i'd operated means for rotating'the spindles and comprising a driving gear, a driven gear, a plurality of sets of driven spur gears, one of each set in mesh with the driven gear and the other in mesh with a gear carried by each tool spindle, and means for driving said driving gear.

8. A thread rolling machine having a plurality of radially shiftable slides, rotatable spindles carried by said slides, tool rolls carried by said spindles, a rotary cam for uniformly shifting said slides, means for actuating said cam, and means comprising fluid operated means for rotating the spindles and comprising a driving gear, a driven gear, a plurality of sets of driven spur gears, one of each set in mesh with the driven gear and the other in mesh with a gear carried by each tool spindle, and means for driving said driving gear, said gearing including change gears.

9. A thread rolling machine having a plurality of radially shiftable slides, rotatable spindles carried by said slides, thread rolls carried by said J spindles, a rotary cam for uniformly shifting said slides, fluid controlled means for actuating said cam and including a reciprocating piston having worm teeth in engagement with similar teeth carried by the cam, means for adjusting the stroke of the piston, and means for rotating the thread roll spindles and comprising a driving gear, a driven gear, a plurality of sets of driven spur gears, one of each set in mesh with the driven gear, and the other in mesh with a gear carried by each thread roll spindle.

10. A rolling machine comprising a base and a gear box thereon, a hydraulic unit within said base, a hydraulic unit carried by said gear box,

a plurality of radially shiftable slides, rotatable spindles carried by said slides, tool rolls carried by said spindles, a rotary cam for uniformly shifting said slides, all carried by said gear box, means controlled by said hydraulic unit within the base for actuating said rotary cam, and means controlled by said hydraulic unit carried by the gear box for rotating said tool roll spindles.

11. A rolling machine comprising a base and a gear box thereon, a hydraulic unit within said base, a hydraulic unit carried by said gear box, a plurality of radially shiftable slides, rotatable spindles carried by said slides, tool rolls carried by said spindles, a rotary cam for uniformly shifting said slides, all carried by said gear box, means controlled by said hydraulic unit within the base for actuating said rotary cam, means controlled by said hydraulic unit carried by the gear box for rotating said tool roll spindles, and means for adjusting the position of said cam.

12. A thread rolling machine having a plurality of radially shiftable slides, rotatable spindles carcied by said slides, thread rolls carried by said spindles, a rotary cam for uniformly shifting said slides, fluid controlled means for actuating said cam and including a reciprocating piston having worm teeth in engagement with similar teeth carried by the cam, means for adjusting the stroke of the piston, means for rotating the thread roll spindles and comprising a driving gear, a driven gear, a plurality of sets of driven spur gears, one of each set in mesh with the driven gear and the other in mesh with a gear carried by each thread roll spindle, and adjustable means automatically operative for limiting the movement of said cam.

13. A thread rolling machine having a plurality of radially shiftable slides, rotatable spindles carried by said slides, threading rolls carried by said spindles, a rotary cam in direct engagement with said slides for uniformly shifting them, a hydraullc unit for oscillating said cam and embodying a reciprocating piston in direct engagement with said cam and fluid control valves for said cam, a hydraulic unit for rotating said thread roll spindles and embodying a fluid control valve for controlling the speed of the thread rolls.

14. A thread rolling machine having a plurality of radially shiftable slides, rotatable spindles carried by said slides, threading rolls carried by said spindles, a rotary cam in direct engagement with said slides for uniformly shifting them, a hydraulic unit for oscillating said cam and embodyin a reciprocating piston in direct engagement with said cam and fluid control valves including a time delay valve for said cam, a hydraulic unit for rotating said thread roll spindles and embodying a fluid control valve for controlling the speed of the thread rolls.

15. A thread rolling machine having a plurality of radially shiftable slides, rotatable spindles carried by said slides, thread rolls carried by said spindles, a hydraulic unit for rotating said spindies and embodying means for controlling the speed of said spindles, a rotary cam for uniformly shifting said slides toward and from each other, a reciprocating piston for rotating said cam, a hydraulic unit for operating said piston, means for controlling the stroke of the piston and thereby the movement of the cam, and a time delay valve for said cam.

16. A thread rolling machine having a plurality of radially shiftable slides, rotatable spindles carried by said slides, threading rolls carried by said spindles, a rotary cam in direct engagement with said slides for uniformly shifting them, a hydraulic unit for oscillating said :cam and embodying a reciprocating piston in direct engagement with said cam, a flow control valve for said cam in communication with a four-way valve located between said flow control valve and said piston, a time delay valve for said cam, and a hydraulic unit for rotating said thread roll spindles and likewise embodying a flow control valve for controlling the speed of the thread rolls.

1?. A tool rolling machine having a plurality of radially shiftable slides, rotatable spindles carried by said slides, tool rolls carried by said spindles, a rotary cam for uniformly shifting said slides, fluid controlled means for actuating said cam and including a reciprocating piston having a rod with worm teeth in engagement with similar teeth carried by the cam, an adjusting member fastened to said piston to rotate the same and the worm teeth and thereby readjust the position of the rotary cam relative to the shiftable slides without longitudinally shifting the piston and the worm teeth, and means for rotating the tool roll spindles and comprising a driving gear, a driven gear, a plurality of sets of driven gears, one of each set in mesh with the driven gear, and the other in mesh with a gear carried by each thread roll spindle.

18. A thread rolling machine having a plurality of radially shiftable slides, rotatable spindles carried by said slides, thread rolls carried by said spindles, a hydraulic unit for rotating said spindles and embodying means for controlling the speed of said spindles, a rotary cam for uniformly shifting said slides toward and from each other, a reciprocatin piston for rotating said cam, a hydraulic unit for operating said piston, means for controlling the stroke of the piston and thereby the movement of the cam, time valve means for said cam, said piston having a rod with worm teeth thereon engaging gear teeth on the rotary cam, and an adjusting member fastened to said Number piston to rotate the same and thereby position 1,930,059 the rotary cam relative to the slides. 2,098,213 ALFRED E. DRISSNER. 2,130,069 WILLIAM J. HOGG. 5 2,252,130

REFERENCES CITED The following referenices are of record in the Number file of this patent: 1,561 UNITED STATES PATENTS 10 332 Number Name Date 25 314 280,723 Davis July 3, 1883 4,010 1,039,992 Muncaster Oct. 1, 1912 1,874,995 Heinauer Aug. 30, 1932 15 Name I Date Muller f Oct. 10, 1933 Benedek Nov. 9, 1937 Criley Sept. 13, 1938 Lamprecht Aug. 12, 1941 FOREIGN PATENTS Country Date Great Britain June 27, 1860 Great Britain Oct. 10, 1893 Great Britain Jan. 11, 1895 Great Britain Nov. 24, 1902 France Apr. 19, 1905

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