US2319785A - Cross roll apparatus - Google Patents

Description

May 25, 1943. P. B. ABRAMSENY a 2,319,

CROSS ROLL APPARATUS Filed Au 4, .1940 5 Sheets-Sheet 1 f May 25, 1943'. I 'P. B. IABRAMSEN 5 CROSS-ROLL APPARATUS Filed Aug. 4, 1940 s sheets-sheet 3 P P- -1 ascism.

ig dg mmgwwd Patented May 25, 1943 Petter B.

Pa., by Gudrun Abramsen,

mont, Pa.

Abramsen, deceased,

late of Dormant, adminlstratrlx, Dor- -Application August 4, 1940, Serial No. 351,376 1 Claim. (Cl. 153-60) This invention relates to cross roll apparatus for straightening and polishing round bars, tubes, and other round stock.

In apparatus of that sort straightening in short centers, and under uniformly applied pressure, while adequately confining the stock in its pass line through the apparatus, in order effectively to straighten the stock in a minimum number of passages through the apparatus without injury to the stock.

it is desirable to eflect The apparatus of this invention provides those advantageous features in conjunction with a direct, mechanically and electrically interlocked drive, organized to drive both rolls of at least two passes in multi-pass cross rolling apparatus at fundamentally uniform speed, and in conjunction with mechanical means for varying the effective speed of the stock in the driven passes of the apparatus in accommodation to work upon stock of a particular sort, or .in accommodation to a particular effect which is to be performed on the stock. g

This invention recognizes that in the straightening and initial mechanical cleaning of-stock,

pressure of substantial value being employed, it

is important that, all positively driven passes of the apparatus be operated at approximately equal speed, in order that the stock will not be marked by dragging in the passes, and in order that the highest speed and best straightening effect will be obtained. It .also recognizes that in passing straightened and initially cleaned stock through the apparatus for a final polishing effect, the pressure on the stock in such operation being relatively light, it is of advantage to operate the positively driven passesofthe apparatus at slightly different speeds in order to obtain under those conditions the drag" on the stock which would be undesirable under the more severe conditions of pressure and fiexion appropriateto the straightening and initial cleaning of the stock. Also in operating on thin wall tubing, severe pressure being undesirable it is'frequently useful to impose a slight drag" on the stock.

The object attained by the invention is thus to combine speed uniformity between two or more passes of a cross-roll straightening and'polishing machine in which both rolls of each driven pass are directly driven by driving means and connections mechanically interlocked between passes, withmechanical means for varying the effective stock speed inthe so-driven passes of the apparatus, and for varying the relative linear speed of the rolls in the two passes in their contact with the stock.

In the accompanying drawings, illustrative of a physical embodiment of the invention, Fig. I is a side elevation of cross roll straightening and polishing apparatus organized to effect the objects of the invention. Fig. 11 is a view partly in plan,

- and partly in section on the section line IL-II line cuts along the pass of Fig. I, which section line of the apparatus. Fig. H1 is a plan view of the apparatus, showing the driving connections to the rolls. Fig. IV is a diagrammatic view showing in full lines the rolls of the driven passes crossing each other at the same angle in both passes, to give an equal efiective speed in both passes; and showing in broken lines the rolls of one driven pass swung to a diiferent angular'arrangement to give different effective speeds in the two driven passes.

In the apparatus illustrated as exemplary ofthe physical embodiment of the invention there is no structure responding specifically to definition as a housing. From a base I there rise posts 2, which may, if desired, carry a canopy 3. Three cross roll passes are shown, the entering pass A and the leaving pass C being driven, and the intermediate pass B being shown as an idler pass. The lower rolls 4 and 6 of the passes A and C are mounted on the base I, and the upper rolls 1, 8 and 8 of the respective passes are mounted on the posts 2. By mechanism which will be described, both rolls 4 and I of the entering pass A are positively and directly driven, and both rolls I and! of the leaving pass C are positively and directly driven.

The driving means and connections for the rolls of the two driven passes A and C are mechanically interlocked in the following manner:

Motive power is obtained from two electrical motors II and II, which are shown as disposed angularly to each other at the same side of the machine. of these motors the motor ill connects, by way of a speed-reducing box l2, and universal spindles l3 and I4 respectively with the shafts of the lower rolls 4 and 6 of theroll passes A and C. 'Motor ll connects, by way of speedreducing box I! and universal spindles l6 and II respectively with the shafts of the upper rolls I and 9 of the roll passes A and C. Knuckle connections. organized to permit a posit on of the roll shafts out of line with the spindle axes are shown at l8 and IS in Fig. II, connecting the spindles i3 and i4 with the rolls 4 and 6. It is v clear from the'drawings, and particularly from Figs. I and II, that the open structure of the apparatus and its roll arrangement are well adapted to the driving arrangement in which the longer spindles l3 and I6 lie for a substantial portion of their length within the overall boundsot the machine proper in reaching to their points of connection with their respective rolls.

This driving arrangement definitely and mechanically relates both rolls of each of the driven roll passes with a roll of the other pass, since they receive their power from the same motor and through the same gear box. As between the speed of the two rolls in the same pass, there is an inherent tendency for the two motors. so coupled through the stock, each to accommodate itself to the speed of the other, to give an equal speed of the two rolls in each pass, as well as between the corresponding rolls in the two passes.

Given this mechanically interlocked drive between passes, and electrically interlocked drive between rolls of the same pass, with resultant fundamental uniformity in speed throughout the driven passes of the apparatus, there are imposed on that arrangement mechanical adjustments, consistent with the interlocked driving of the rolls, capable of adjusting the effect of one or both the driven passes on the stock, to give when desired a difierent speed of stock travel in the passes. The apparatus also comprises means which provide mechanical adjustment for varying the diameter of the pass line for stock of different sizes and for varying the pressure of the rolls on the stock.

As shown in Fig. I of the drawings, each of the posts 2 is threaded in its upper region, and roll supports 20 for the upper roll of each pass are mounted across the machine, on transversely opposed posts by nuts 2|. Each nut 2| carriesa worm gear 22, meshing with a worm 23 on a, shaft 24 operated by a handwheel 25. Nuts II are engaged with the roll supports 28 by collars Zia, so that the nuts in their rotation carry the roll supports up or down the posts 2 with them. Lock nuts 26 hold'the roll supports in vertically adjusted position. This adjustment regulates the spacing between the opposed rolls of each pass, and serves to regulate the pressure exerted on stock in the pass. The lower idler roll 5 is not mounted directly on the base I, but is mounted on a lower threaded region of two opposed posts 2, by means of a. roll support 2811 generally similar to the roll supports 28 for the upper rolls. This support is vertically adjustable on its posts by means of nuts 26a, which are generally similar to the lock nuts 28 associated with the upper roll supports and which lie above and below collars 26b on the roll supports. This vertical adjustment of the lower roll 5 is provided to give when desired an oil'set pass for increasing the flexion on the stock.

Each of the upper rolls 1,8 and 8, as are also each of the lower rolls I and 8, is mounted in a bracket 48 carried by a turntable. The turntables 21 for the upper rolls are revolubly mounted on the roll supports 28, and the turntables 28 for the lower rolls 4 and 6 are revolubly mounted on the base I of the apparatus. The bracket for the lower roll I is mounted in aturntable 28a on the lower roll support 280. Each 01' the turntables 21, 28 and 28a carries a yoke Ilatraddling a pin 88 on a tangentially placed adjusting bar 8| mounted for straight-line movement. Movement of the adjusting bar is produced by a micrometer screw 82, threaded in'a hub 33 and rotatable by a handwheel 84. Desirably, a scale and pointer assembly 35 is organized between each turntable and the structure on which it is mounted. to indicate theexact angular position of the roll.

It will be noted that the above adjustments including the angular adjustment of the rolls is consistent with the driving organization for the rolls, the machine being organized to give the adjustment without disturbing the driving organization. Fig. IV of the drawings illustrates diagrammatically the primary underlying principle of the invention. It will be assumed that a straightening operation of the sort most commonly performed is to be done in the apparatus. In such case, the three upper rolls 1, 8 and 9 are brought to bear with substantial pressure on the stock in the pass-line and the angular crossing of the rolls throughout the apparatus is uniform. With the organization of the rolls shown, the most efiective angular adjustment for such operation is approximately thirty degrees. This is the condition shown in full lines in Fig. IV and in such condition full advantage is taken of'the roll arrangement and the positive driving of both rolls in each of the passes A and C to give maximlnn straightening efi'ect with a minimum of drag in the passes. This minimized drag and maximum straightening eilect isattributable to the fact that both rolls of each pass are positively driven and that the speed is invariably uniform between the rolls of the two passes.

Assuming, however, that an operation of different sort is to be performed in the apparatus, such as a polishing operation on previously straightened and relatively clean stock, the pressure of the rolls need not be so great as in a severe straightening peration, and the upper rolls 1, 8 and 8 are raised slightly'to decrease the pressure. In such operation, some drag in the rolls being useful, the rolls in the entering pass are angled slightly more, to give an increased stock travel in this pass as compared with the travel in the leaving pass C. This results in a moderate drag in the leaving pass C, which under the relatively light pressure conditions adequate tor the operation serves more competently to polish the stock without producing an obvious scroll or shadow marking on the stock. In the showing of Fig. IV, the relative angular adjustment or the rolls 4 and l is shown as exaggerated because in actual practice the angular adjustment is very slight, varying usually within five degrees from a thirty degree crossing of the rolls. It will also be noticed that in Fig.1! the intermediate idler P855 B is omitted. This is for simplicity of illustration, since the rolls intheidlerpassmayremaininthesame angularadjustmentastherollsiandloftheleaving pass 0, may be brought to the same angular adiustmmt as the rolls of entering pass A, or may be brought to an angular relation intermediatethatoftherollsinthepasscsA and C. Itis also to be understood that without fundamental alteration in the form or arrangement 01' the apparatus, each of the rolls 5 and 8 or the pass B, which are shown and have been described as idler rolls, may be driven similarly to the rolls of the other passes by means of a third flexible spindle driven one from each of the two motors l8 and II. In claiming two positively driven it is intended therefore to claim any greater number of driven passes which may be included in the apparatus.

It should be noted that the rolls or both the upper and lower sets are angularly adjustable, and it has been mentioned that the change in angular position of the rolls is very slight in accommodation to diirerent use conditionsor the apparatus. It is thus possible to make angu- I cludlng at least two cross roll lar adjustment within the limits of desirability without imposing on the drive undue deflection from the straight line of the spindles.

It is to be understood that within the bounds of the invention as defined in the appended claim numerous equivalent structural forms may be found, and numerous equivalent arrangements may be made.

It is claimed:

Incross rolling apparatus for round stock intwo positively driven rolls, a drive for the two said passes including driving connections from one power source to one roll in each of the cross roll passes and driving connections from another power source to the other roll in each of the passes each having -one of the rolls in the two cross roll passes, so that the rotative speed of each roll in each pass is equal to the speed of other pass and so that

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