US 2970339 A
Description (OCR text may contain errors)
Feb. 7, 1961 J. M. HAUSMAN 2,970,339
CALENDER ROLL HAVING ADJUSTABLE CROWN Filed Sept. 12, 1957 3 Sheets-Sheet 1 FIG.|
INVENTOR. JOHN M. HAUSMAN 3 Sheets-Shea i9 vw m\ Feb. 7, 1961 J. M. HAUSMAN CALENDER ROLL HAVING ADJUSTABLE CROWN Filed' Sept. 12, 1957 INVENTOR. JOHN M. HAUSMAN Feb. 7, 1961 J. M. HAUSMAN CALENDER ROLL HAVING ADJUSTABLE CROWN Filed Sept. 12, 1957 3 Sheets-Sheet 3 INVENTOR. JOHN M. HAUSMAN ATTY S 'roi'm- MliHau sm m, sss r naaewaarnave; Stave, 'OIiio' Filed se 'e 12,- 1 957, Ser't-No; 683,579 4* Chi ims' 1, cam-21 1 east ,terials; is desirable; to prov-idelmachineshavlng at l one pair of cooperating rollsto form the'rnatenial-v from a mass thereof into. sheet form.-
thickness. t shee-tproduct .isreduced; The: pressurns, neq s d n y-Ja soea st au t a IQHSMD how or deflect and to overcome the onsequent ncrease in thickness along a medial zonewflthe rolled sheetit has been common-practice, tolprovide-calender. rolls whose working faces. arecrowned onin other; words whose. diameters are made slightly:la1 =g er= at the cent crsoftheworking. faces than at the rna-ngi-nspithe.workinggfacese I t The pressure required to oll re -sheet; ;1'; .from a batch thereof increases rapidly as the desined 2,970,339 fiatented Feb. 7, 1961 frame members 5. 6.: gscrews 10;; 1 1 are provided to adjust;-,the ,rpll;.7 and its bearings, and may beadjusted asbnr otatingwwheels 12;..13 hired to screws; 10; 11,..0; in any other manner. In similar manner,.the; lower roll 14 is; mounted fori rotating; inzbearings. 15, 16 mounted ion vertical, adjustment in;fr am emembers. 5, 6, and ad;
jnstedib crews-471,; 18- having wheels. 19, 20" secured hI Of Z m nat li Qnylq dnives-rolls and; lglrthrough a. gear 21- fixed totrqll hand. ge,ars 2r}cand 23: fixed to rolls 7. and 14 respectiyely"; andr meshing. withtgear. 21.. V j Eon; regulatingnks temperature of, the.. individual rolls, each: rollqis made hollow sothat cold orhot water or steanymayr circulated therethrough. To accomplish cinculation'while. permitting the roll to. rotate a. cap; men ecured toanaends of the roll, as by bolts 25 provide a, cylindrical: recess 26. A conv c onnnonly'knownas.zrffhnilhteej having an qntwar'dly cit-tending; flange 28,; i s rotatably. mounted int-h reess rt n t f m l nts th rea nd he ha an 'nlet passage 32' and an ontlet fi extending therealong from. its inner:v end to .p nsitinns putside the roll. where. they connect with radial passagesfizt and, 35,. respectinely,extending. in opposite one ditficultyexperienced with crownedtroills i s- "that.
if the. crown is correctfor rollingone composition to a certain thickness it-is incgn rectggfor rolling the same-cornposition to a different thickness or for rolling? difierent composition the same thickness.- i
It has also been proposed to provide complex adjusting'lmechanisrns forthr'owing-the axes oi calender rolls ontyof parallel to counteract bowing ofi the rolls. Such areas, have encountered many mechanical d-iificultiesand haysv not been. too satisfactory...
hpresent invention has for its; objeott to proyide a pf crown to accomplish crown a dj-u'stmentwithout changcalender roll having means for changing-tits amount ofv ing the axial plane of the roll, and toprovide for adj-usting the crown of the roll whilethe roll is in use.- V
I These and other objects will appear fromthe; following description and the accompanying drawings.
Qf the drawings":
Fig. 1 is a front view ofa three roll calender;
Fig.2 is an axial s'ectionalview of a calender roll therefor showing oneform of the invention;
Fig. 3 is an axialsectionalview of one end of a calender roll andshowing in diagram pipe connections and valves, part of theroll being broken away, the figure illustrating a modification of the invention; 7
Fig. 4 is an axial sectional view of one end; of a calender roll illustratinganother modification of the invention, the opposite end of the roll being broken away;
Fig. 5 is a detail perspective view of a vfour connection milltee as used in the modification of ig. 4;.
Fig. 6 is. a detail perspective View of one of the lantern rings of Fig. 4; and Y Fig. 7 is a end view of the mill-tee mg. Sishowing Referring to the drawings and first to Fig. 1 thereof, this shows an exam le of a threeroll calender "such'as is employed in the rubber industry I}! siren ,a'calende'r,
a center roll 1 is mounted in fixed bearings; atorrotaq In order to pro tie more uniform" of he; slip connection.
directions through a head 3 6 tof the body; body iszfpreyented -frorn rotating an inlet pipe 3.7 and; an
predio pass c5 34 am ss; respeotinely, r. m ,answhi e roll'may rotate because pipe. may besecured totlie ay extend. for: a distance: within t e p r or by any 0 inlet. passage- 32. id-
fthegrollto more uniformly distribute the heating. or
cooling. medium. r
I Theinlet pipe. is ordinarily connected to acont'rolvalve (not shown). connecting, it.to a cold water supply and .al soHto. a. control. val'krefl(no-t shown). connecting it toga j adjusting; the crown of a calender roll by pressure applied internally. In one form of the invention, this is accomplishedibyfillihg, the roll with a liquid or other flowable material'and placing the liquid under pressure sufficient to expandthe; roll to a, degree to, providethe desired crown. As shown in Fig. 2, the roll 1 may be'an'y calenderroll andis of thesame construction. as the rolls ofFigJ an d hasthe same, slip connections communicating withfl inlet passage 34and outlet passage 35, respectively; Inthisform of the invention, the inlet passage 34 is connected by a pipe 34a, to a supply ofifiuid, indicated by the pipe..45, by a shut-off. valve wand the outlet 35 is connected toa pressure cylinder 47' by a pipe 47 a. Cylinder 47 istalso provided with a drain line 48..normallyclosed by avalve 49. A piston 50 in cylinder 47 may be moved lengthwise thereof by a hand screw 51 controlled by a hand wheel 52.
I With the arrangement of Fig. 2, the roll may befilled with water or other liquid by closing valve 49 and openvalve 46, Valve 46 is then closed and the liquid in the rolls may be placed under pressure by moving-the being increased more at thecenter'than at the endspro- 'viclin'g a crown 7 depending inv amount upon the internal pressure; i
expansion; he-hill desired temperature by use of the same liquid.
ing roll and its supply pipes.
is preferably machined throughout its bore so that the wall surfaces are uniformly concentric. In Fig. 2, the working face of the roll is indicated by the numeral 53. This face may be initially cylindrical but is preferably machined to be initially slightly crowned. To provide further for greater expansion of the roll 1 at the center of its working face, the cavity-54 is machined to provide walls which progressively decrease in thickness from the ends of the roll face to its center as by making the surfaces 55, 56 conical.
In Fig. 3 only one end of the roll 1 is shown to indicate the pipe connections, other portions being broken away and the other end of the roll being closed. The roll is identical in construction with that shown in Fig. 2. In this form of the invention, the fluid used ordinarily to heat or cool the roll is additionally employed to provide fluid pressure to increase the crown of the roll in use. For this purpose, the inlet connection 34 is connected to the outlet of a high pressure pump 60. The inlet of the pump 60 is connected to a mixer 61 which in turn is supplied by hot and cold water or other liquid by way of valves 62, 63. By adjustment of valves 62. 63, the pump is supplied by temperature controlling liquid at any desired temperature. The outlet passage 35 from the roll is connected to a pressure relief valve 64 having an outlet 65 connected to a drain. The valve has a valve seat 66 and a poppet valve 67 seated therein. The valve is held against its seat by a coil spring 68. The side of the valve opposite the spring is exposed to pressure from the roll '1 and the valve may open to exhaust under fluid pressure exceeding tension of the spring. Spring tension may be adjusted by a screw 69.
The arrangement is such that by adjustment of relief valve 64, the liquid pressure in the roll may be held at a desired amount to provide expansion of the roll to increase its crown as desired while at the same time by control'of valves 62 and 63, the roll may be kept at the In place of the mixer 61, a heat exchanger may be provided and cooling or heating water from a single supply may be supplied therethrough to the pump 60, the temperature of the liquid delivered to the pump being provided by transfer of heat thereto from the hot and cold supplies 62, 63.
.The modification of the invention shown in Figs. 4 to 7, inclusive, provides for expanding a calender roll by pressure applied from within while controlling temperature of the rolls by circulation of liquid therethrough. in this form of the invention, a calender roll 70 is externally similar to the roll 1 previously illustrated and is chambered similar to the roll 1. Within its chamber 71 however and at the central plane of the roll face is an annular tubular body 72 having an outer diameter equal to the interior diameter of the roll at that position.
Two tubular connections 73, 74 extend from one side of the-ring and are connected to passages 75, 76 respectively, extending lengthwise of the roll neck 77 at opposite positions spaced radially from the bore 78, the connections being preferably made by welding.
The end of the roll neck 77 is counterbored, as at 79, to receive a cap member 80 having a cylindrical counterbore for receiving a slip connection 81, commonly known as a mill-tee, the purpose of which is to provide continuous connection between fluid passages of a rotat- In the present embodiment of the invention, it is desired to heat and expand the tubular body 72 and thereby to expand the center of the roll and for this purpose steam or pressure liquid supply and exhaust connections 73, 74 are connected throughthe mill-tee. Also the roll must have temperature control. so connections including asupply and exhaust for chamber 71 are also provided through the milltee. "For this purpose radial passages 82, 83 connecting :with passages 75, 76 respectively are provided inthe roll neck at axially spaced positions and connecting opensired amount.
ings 84, 85, in continuation thereof, are provided through the wall of the cap member.
The slip connection or mill-tee is shown in Fig. 5 and has four axially extending passages 86, 87, 88 and 89. Of these, passages 86 and 87 terminate in side openings 90 and 91 respectively in axial alignment with passages 84, 85 respectively. Their opposite ends terminate in radial openings 92, 93 respectively. A pair of similar lantern rings 94, 95, of which 94 is illustrated in Fig. 6, each comprise spaced parallel rings 96, 97, held in spaced relation by spindles 98. They are slidably mounted about the mill-tee within the cap with their central spaces connecting passages 84, to openings 90, 91, respectively. Gasket rings 96a and 97a flanking lantern ring 94 and packing ring 98a are provided to seal the joints and a gland 99 compresses the gaskets and packing ring. Passage 92 is connected to a steam supply line 100 through a valve 101 and passage 93 is connected'to a drain line 102 through a valve 103.
Passages 88, 89 of the mill-tee are connected to radial openings 104, 105, respectively, in the head of the milltee. The opening 104 is connected through a valve 106 to a supply line 107 of steam or hot water. The opening is connected through a valve 109 with a supply line 108 of cold water. By regulating valves 106, 107, the temperature of the roll may be maintained at a de- By controlling the pressure of the hydraulic liquid supplied to the ring 72, which may be done by manipulating valves 101, 103, and varying the pressure on the supplied liquid, the ring 72 may be expanded to increase the crown of the roll, as desired.
It should be realized that the working roll 1 may originally be of true cylindrical outer contour, if desired, and that the other rolls 7 and 14 may be constructed like the roll 1, or may be of conventional construction and operation, as desired. A conventional spray pipe A is shown in Fig. 4 for other temperature control action.
The desired internal fluid expanding pressure can be supplied in the roll 1 without any control of the temperature thereof when no temperature regulation on the material being processed by the working roll 1 is required. Obviously, the roll 1 of the invention can be used for rolling any desired material in any known type of rolling v or calendering operation, as long as the roll 1 can be provided with sufiicient strength and other operating characteriitlics as is required for operating upon such given materi In another aspect of the invention, and especially where no control of the temperature of the roll is required, it would be possible to fill such a roll with a plastic substance such as vulcanized or unvulcanized natural rubber, synthetic rubber, or the like and wherein the plastic substance is flowable, but not compressible so that it readily transmits pressure therethrough. In such instance, a roll like the roll 1 would be completely filled with the plastic substance and with the cap member supplied at one end thereof, like the cap member 24, being provided with some type of a pressure screw and end piston unit there in bearing upon the plastic material within the roll cavity so that any desired pressure can be exerted upon the roll for bowing or crowning the center portion of the roll desired amounts. Pressures of, for example, 1500 to 2000 lb. per square inch may be used to obtain the desired crowning action of the rolls. It should be realized that in all events the internal bores of the rolls of the invention need not be exactly ofconical shape, but a generally conical shape would be sufficient in some practice of the invention. Also, the invention contemplates the use of rolls with cylindrical center bores as the supports for the rolls are provided at the ends thereof and the centers of the rolls will crown with the japplication of internal pressures thereto.
From the foregoing, it will be seen that a novel and the invention and that small amounts of crown at the center portion of the roll can be readily provided in this roll of the invention. Obviously, rolls of this type only need to be crowned a few thousandths or ten thousandths of an inch at the center portion thereof under most circumstances but they may be crowned more than that to give excellent rolling action to provide fiat calendered sheets of uniform thicknesses throughout the widths thereof, or to give other results or action, as desired. Hence, it is believed that the objects of the invention have been achieved.
While several complete embodiments of the invention have been disclosed herein, it will be appreciated that modification of these particular embodiments ofthe invention may be resorted to without departing from the scope of the invention as defined in the appended claims.
1. A cylindrical metal roll for rolling deformable material into sheets of accurate thickness and having a chamber underlying its working face and having walls decreasing in thickness towards the center of the roll, said roll and its walls being rigid and of sufficient strength to withstand normal operative forces applied thereto, uncompressible but flowable material positioned within and filling said chamber, and means engaging said material for applying pressure thereto for expanding the roll to provide it with a crown intermediate the ends thereof, said means connecting to said material and being able to vary the pressure exerted thereon when the roll is rotating.
2. A cylindrical metal calender roll having a chamber underlying its working face and having Walls progressively decreasing in thickness towards the center of the roll, said roll and its walls being rigid and of suflicient strength to withstand normal operative forces applied thereto, means within said chamber for expanding the roll to provide it with a crown intermediate the ends thereof, said means comprising a body of uncompressible liquid confined within and completely filling said chamber, and second means engaging said liquid for applying pressure to and maintaining it on said liquid.
3. A cylindrical metal calender roll having a chamber underlying its working face and having walls decreasing in thickness towards the center of the roll, said roll and its walls being rigid and of sufiicient strength-to withstand normal operative forces applied thereto, means within said chamber for expanding the roll to provide it with a crown intermediate the ends thereof, said means comprising a body of liquid confined within and completely filling said chamber, and second means engaging said liquid for applying pressure to said liquid.
4. In a heavy duty mill for accurately sized sheet rolling action and comprising a plurality of metal rolls positioned for rolling pressure engagement therebetween, the improvement for crowning at least one of said calender rolls having an axially extending center chamber therein filled with substantially uncompressible but flowable material, said center chamber connecting to at least one end of said calender roll, said calender center chamber being of twin frusto-conical shape with the bases of the cones being at the center of the roll the walls of which have sufiicient strength to withstand normal rolling pressures applied thereto, and means connecting to the material in said center chamber to apply pressures to said material to produce a controllable center crown on said calender roll in the range of from a few ten thousandths of an inch to a few thousandths of an inch thereon.
References Cited in the file of this patent UNITED STATES PATENTS 2,074,410 Matthews Mar. 23, 1937 2,108,071 Low Feb. 15, 1938 2,144,793 Christensen Jan. 24, 1939 2,206,410 Lally July 2, 1940 2,648,122 Hornbostel Aug. 11, 1953 2,673,168 Pascoe et a1 Mar. 23, 1954 2,732,591 Whittum Jan. 31, 1956 FOREIGN PATENTS 314,726 Switzerland June 30, 1956