US2311998A

US2311998A - Centerless turning machine

Info

Publication number: US2311998A
Application number: US318636A
Authority: US
Inventors: Pope Alfred
Original assignee: Bigwood Joshua & Son Ltd
Current assignee: Bigwood Joshua & Son Ltd; Joshua Bigwood & Son Ltd
Priority date: 1939-02-25
Filing date: 1940-02-12
Publication date: 1943-02-23
Anticipated expiration: 1960-02-23

Description

Feb. 23, 1943. n POPE 2,311,998

CENTERLESS TURNING MACHINE- kwin Alfred Pope 'Af POPE 2,311,998

CENTERLESS TURNING MACHINE.

Fnedreb. 12, 1940 4 sheets-snaai 2 Feb. 23, 1943.

Feb. 23,1943. A, PQPE cENTERLEss TURNING MACHINE' Filed Feb. 12, 1940 4 sheets-sheet 5 AHF-frais Feb. 23, 1943. A. POPE cENTERLEss TURNING` MACHINE www 4 Sheets-Sheet 4 Filed Feb. 12, 1940 #des Patented Feb. 23, 1943 CENTERLESS TURNING MACHINE Alfred Pope, Penn Field land, assignor to Josh ited, Wolverhampton,

s, Wolverhampton, Engua Bigwood & Son, Lim- England Application February 12, `1940, Serial No. 318,636 In Great Britain February 25, 1939' 6 Claims.

This invention relates to centerless turning machines of the kind employed for turning lengths of shafting or the like, mandrel bars and peeled tube billets, and for turning high grade tubes made from special steel, such machines usually comprising a plurality of rotating heads carrying cutting tools, one head being used for roughing, and the other or another being used for finishing, the work usually being fed through the machine by means of feed rollers and being supported and guided lby clamping heads which can travel with the work, there usually being a clamping head at the feed end and another at the delivery end. In these machines the work travels axially, but does not rotate.

The drive to the rotating head-s is usually imparted to a continuous driving sleeve in which both or all the heads are mounted. Further, this sleeve is usually mounted in two or three bearings provided in the body of the machine, there being a bearing on each side of a worm wheel or gear wheel on the sleeve by which motion is transmitted to the sleeve, and in some cases one further bearing on the delivery side of the finishing head.

The object of the present invention is to provide an improved construction.

According to the present invention, separate driving sleeves are provided, one for the roughing head and another for the finishing head, each sleeve having its own driving member such as a worm wheel or gear wheel.

With this arrangement, the vibration and shocks produced by the action of the roughing head are not directly transmitted to the nishing head.

Further, the arrangement allows of the nishing head being driven at a diiTerent speed from the roughing head. It can be `driven either faster or slower. Further, the arrangement allows of the inishing head being driven in the opposite direction from that taken by the roughing head. Such an arrangement is 4advantageous in some cases where the roughed work is not truly cylindrical, and consequently with the heads rotating in opposite directions, the shocks or reactions produced are to some extent balanced.

According to a further part of the present invention, the rotating heads are each rigidly supported in bearings at both sides, i. e. four bearings are provided in place of three, the bearings being placed in the body of the machine and supporting each driving sleeve at each side of the rotating head carried by the sleeve.

Referring to the drawings: f Figure 1 is a plan view showing one construcllOll;V

Figure 2 is a section on line 2-2 of Figure 1. Figure 3 is a section on line 3-3 of Figure 2. Figure 4 is a section on line '4-4 of Figure 2. Figure 5 is a section on line 5 5 of Figure 2. In the construction illustrated, the supporting and guiding means for the member I0 which is to be turned, are not shown. Such supporting and guiding means are well known inthe art, and include at each end of the Imachine one or more guide bars placed horizontally and parallel to the shaft I0, and clamping devices slidably mounted on such guide bars and having means whereby they may grip a shaft such as I0, such clamping means serving to support the shaft and to guide it so that it moves with anfendwise movement, the clamping means moving with the shaft.

The drawings do, however, illustrate the means for imparting the endwise movement to the shaft, such means being shown at the left hand end of Figures 1 and 2 and also in Figure 5.

The machine comprises a bed II of deep box section, this bed having a table I2, to the upper side of which is secured a body I3 carrying the feed mechanism. f

Thebed I I also comprises a box-like portion I4 carrying the driving sleeves' I5 and I6 for the turning'heads I'I,' I8. The part III'of the .bed forms a container and receives the turning uid in the compartments I9.

ects the turnings towards the front of the machine and out through openings 2|, while the turning fluid which passes through the perforations inthe plates 20 and collects inthe compartments I9, can be returned to circulation by suitable means.

The walls of the bed II above the part I4 are formed with portions .22, 23, 24, 25, 26 and 21 which serve to support the driving sleeves I5 and I6. The

portions

22, 24, 25 and 21 form housings for anti-friction bearings 28.

Above the bearings 22 and 23 and above the bearings 25 and 26 removable castings 29 are provided, these incorporating the upper parts of the bearings 23 and 26 and the upper parts of the housings for two of the anti-friction bearings 28. V-

Each of the driving sleeves I5 and I6 is provided. with a worm wheel, that on the sleeve I5 being, shown at 3U, and that on the sleeve I6 Above each of the compartments I9 is a perforated plate 20 `which dedrive the sleeves I5 and in the sleeve I6..

The portion 31 contains a turning headrhd which is rmly secured to thev sleeve and rotates therewith, and I6 carries a turning head I 8.

Each turning head is formed withfour substantially radial arms-39yV which arms are slotted and fitted with guide platesl 40.' In three -of the guide .plates are adjustably mounted stems 4I' carrying at their inner ends 4rollers 42." In the other,` guideplate a turning tool 43 is adjustablyfixed.` Y a y The three stems 44I and the turning tool can be adjusted towards and away`from-fthe axial centre ofV the sleeve.Y 4The outer end of each stem4I is-hollow and containsv ac nut which is prevented from endwise movement 'in relation to the stem',A andthisnut is engagedby the inner screwj threaded end of an adjusting pin 14 passing through a b1ock15attached Vto the turning heath-*The pin 14 is prevented from endwise movement `in* the blockv 151 andbwhen the `pinv is turned, threaded partan' stem 4I Yproduces endwise The turning tool 43 can to 4`I having rollers 42 at their innerV ends en-V gaging'the shaft I0.

The frame-like part 31 carrying the turning head-|1 and the steadyv headi44 vis enclosedby a cap 45, and the" frame-like part 38 carrying the turning head I8 is enclosed by'a cap` 46..

As will be seen,vv theopem'ngthrough eachlof the drivingsleeves I and I6 is larger than-the particularY shaft I Il which is ings. operate -upon any shaft provided its external diameter before `machining is somewhat less than the-diameter of the openings throughthe driv-` ing sleeves I5 and I6. If the shaft is of.` less diameter than is shown in the drawings, `then the stemsv 4I are .adjusted inwardly as also are the turning tools 43.'

Both in-thefroughing head andthe finishing head'the turning tool operates on the shaftin advance ofthe pointsV of engagement between the rollers 42 and the shaft, the latter moving from left toright. f

The feed gear -for the shaft comprises .anupper roller'41v bearing on top of pairs of directly opposed

rollers

48, 49, operating 32 and 33` is provided with a'frame-like` portion 31, and a similar portion 38 is provided similarly the part 38 of the sleeve" the engagement between its d th nut withinthe lhllowf movement of the stern.- be adjusted in an end` v wise direction by loosening the nuts 16,' and after j been effected, the nutsY shown in the draw, A machine as illustrated will of course the shaft and two l, each driving sleeve carrying Vis made for the upper roller 41 Ablock 61 enables the feed rollers 59 is supported in on the sides of the shaft. Each of the rollers 48 is mounted on a separate shaft `5Ilprovided with a worm wheel 52, and each of the feed rollers 49 is mounted on a separate shaft 5I provided with a worm wheel '53. The two rollers 48 are driven in the opposite direction from the directionA taken by the rollers 749.

Thus, there are two worm wheels 52 worm wheels 53.

Each pair of worm wheels consisting ofone worm wheel 52 and one Worm wheel 53 is driven by means of worms 54 on a shaft 55. The two worms 54 on theshaft 55 are of opposite hand in order 'toproduce opposite rotation of the feed rollers 48,V 49.- Each of the shafts 55 carries arvvorm wheel 55,`and these are driven by worms 51,58 v on a shaft' 59. The two

worms

51 and 53 are -of the same hand so :that the two shafts 55 are driven in the same direction. Y

The two shafts 50 and the two shafts 5I are carriedwin bearingy blocks 69, eachoflwhich .is recessedas Vshown at 6I these bearing blocks can slide horizontallyupon guides 62formed inY the casting I3. Each bearing block .69"can be adjusted horizontally towards or away. from the centre of the shaft I0 by means of la screwed stem 63 having ak reduced neck portion B4 passing through a hole in`a plate 65 secured to the outer end of the recessed' part of the bearing block.

Within'the plate 65'the screwed stem is provided with ahead 66 which bears upon'a rubber or other resilient block61, and at its outer end the screwed stem 63 is provided with a nonand two Vcircular' part E8 so that it canbeturned. After being adjusted, the screwed `stern can be' secured by a lock'nut .69. Thus, all four

rollers

48, 49, can be adjusted bodilytowards or -away from the centre of the shaft I9, andI a similar Provision which is rotatably mounted in a Yblock 1I capable of adjustment by means of a' screwed stem 12 of simil-ar construction tothe stem 63.

The provision of the rubber or other resilient 41; 48, 49, to follow the contour of the shaft, which may of course be somewhat irregularA before machining.

Inward or outward adjustment of the

feed rollers

48 and 49 takes pl'ace in a direction parallel tothe shaftsf55, sov that such adjustment 0can The shaft 13 carries a pulley or sprocket 36,A

which inturn drives the

worms

32 and 33 mounted respectively on the shafts'r11 and 18.` n

The

shafts

11 and 18 yare mount

d inthrust bearings

19, 80, carried in housings 8|, 82, formed in the bed of =the machine.

'Ihe shaft IBI;A is provided 4with* a pulley .or sprocket 83 `driving through belt or chain a pulley or sprocket '84 fixed on the shaft 59. The shaft a bracket 85 xedon the side of the machine bed. I4, the other end of the shaft 59 being provided with suitable bearings in the castingV I3.

What I claim then is:

1.i In a centerless turning machine of the kind specified, al machine bed having two groups of three bearings disposed in .line and a separate driving sleeve disposedain each group of bearings, a machining head and a driving wheel, the machining head 'in each at "its outer end, and

case being disposed between the intermediate bearing and one end bearing of a group, and the driving Wheel in each case being disposed between the intermediate bearing and the other end bearing of the group.

2. In a centerless turning machine of the kind specied, a driving sleeve for the roughing head, a separate driving sleeve for the iinishing head, and a nishing head and a steady head carried by said separate driving sleeve.

3. In a centerless turning machine of the kind specified, a machine bed having two pairs of bearings disposed in line, a separate driving sleeve disposed in each pair of bearings, each driving sleeve carrying a machining head and a worm Wheel, a worm shaft for each of said Worm Wheels, said worm shafts being supported in bearings in the bed, means for driving said Worm shafts, a table at one end of the bed, and feed means for the work supported on said table.

4; In a centerless turning machine of the kind `specified, a machine bed having two pairs of bearings disposed in line, a separate driving sleeve disposed in each pair of bearings, each driving sleeve carrying a machining head, said bed being formed under said machining heads as a receptacle for machining fluid, and means for deecting the turnings from said receptacle.

5. In a centerless turning machine of the kind specied having a roughing head carrying cutting tools and a finishing head carrying cutting tools, a machine bed having two pairs of aligned bearings spaced apart axially, a driving sleeve for the roughing head mounted in one pair of bearings and a separate driving sleeve for the finishing head mounted in the other pair of bearings, each of such sleeves having a frame like portion, situated in each case between the bearings of the pair supporting the sleeve, the roughing head being secured to the frame like portion of one sleeve, and the finishing head being secured to the frame like portion of the other sleeve.

6. A centerless turning machine according to claim 5 comprising two pairs of aligned housings on the machine bed, thrust bearings in said housings, shafts mounted in said thrust bearings, said shafts being disposed at right angles to said sleeves, worms' on said shafts, said worms being of opposite hand, a worm wheel on each of said sleeves, each of said worm wheels being engaged by one of said worms, and means for driving said shafts in the same direction.

ALFRED POPE.