US2506681A - Roll-bearing device - Google Patents

Description

May 9, 1950 s. E. M. NORLiNDH 2,506,581

' ROLL-BEARING DEVICE Filed May 11, 1944 6 Sheets-Sheet 1 May 9, 1950 s. E. M. NORLIND'H 2,506,631

ROLL-BEARING DEVICE Filed May 11, 1944 p 6 Sheets-Sheet 2 May 9, 1950 Filed May 11, 1944 s. E. M. NORLINDH ROLL- BEARING DEVICE 6 Sheets-Sheet 3 May 9, 1950 s; M. NORLINDH 21,506,681

\ I ROLL- BEARING DEVICE .Filed May 11, 1944 1 6 Shets-Sheet 4 12% ax wwm May 1950 s'. E. M. NORLINDH 2,506,681

ROLL-BEARING DEVICE Filed May 11, 1944 6 Sheets-Sheet 5 y 1950 E. M. NORLINDH 2,506,681

ROLL.- BEARING DEVICE Filed May 11; 1944 6 Sheets-Sheet 6 Patented May 9, 1950 tassel ROLL-BEARING DEVICE Sven Erik Malte Norlindh, Hallefors, Sweden Application May 11, 1944, Serial No. 535,148 In Sweden May 21, 1943 3 Claims.

The present invention relates to a roll bearing device, preferably for rolling mills, and has for its object to improve the usual roll bearing or, more strictly speaking to replace them by a construction, which is less bulky, provides better possibilities of mounting of the rolls and enables a more rapid exchange of rolls; the new construction having the important advantage that the rolling pressure is unloaded from the frame and is instead transferred from one bearing box directly to the other via so-called stay-screws.

The construction is also intended to utilize as much as possible the advantages which may be obtained by use of roller bearings and other exactly made bearing constructions. Essentially characteristic for the construction is i. a. that posts have been substituted for the roll casings, which posts support and guide the bearing boxes. The construction as a whole and its different features may be said to be based on this constructional detail, as will be seen from the following.

The invention is illustrated by way of example in the accompanying drawings, which relate to two different rolling mills. Thus Figs. 1-7 relate to two high mills and Figs. 8, 9 and 10 to three high mills.

Fig. 1 shows a section II of the pair of rolls of Fig. 2, while Fig. 2 shows a front view of the pair of rolls.

Fig. 3 shows a section along the broken line III-III of Fig. 1 with some parts added.

Fig. 4 shows an end View of a pair of rolls carried by its posts and Fig. 5 a front view of two pairs of rolls of the reciprocating two high mill, which are mounted in a similar manner.

Fig. 6 shows a pair Of rolls in a radial section and Fig. 7 a detail section along the line VIIVII of Fig. 6.

Fig. 8 shows a front view of the three high mill rolls and Fig. 9 in the left half a radial section and in the right half an end view of the three high mill rolls.

Fig. 10 shows a plan view of three high mill roll pairs without adjusting device for the rolls.

In all of the figures the top, intermediate and bottom rolls are designated by i, la and 2 respectively and their bearing boxes with 3, 3b and respectively. The mounting of the rolls is seen in Fig. 3, the upper section of which shows the known SKF-construction with spherical roller bearings 55 for the roll journals 3a, two for each journal. The journal situated to the left has a shoulder and the narrower outer part of it is resting in a roller bearing provided with a divided outer ring 5a guiding the rolls in the axial direction.

The bearing boxes are supported and guided by posts 6 (Figs. 3, 4 and 5) each resting on a separate base plate 1. Each post with its base plate is used instead of a bearing casing and is according to the invention provided with a guide, in the first place for the two bearing boxes, which are situated at the same side of the pair of rolls and of the post. The post, however, can at the same time form a guide at its other side for the bearing boxes of another pair of rolls, for instance in two high mills according to Fig. 3, in which the post has a T-profile, the flanges 8 constituting the guides themselves. Posts intended to guide only at one side may for instance have L-profile. In the bearing boxes there are recesses 9 corresponding to the flanges. Due to these flanges and recesses the bearing boxes and the rolls will obtain a good guidance. Of course, this guiding device may also be made in other manners. The bearing boxes 3, 4 respectively at each side are connected to each other by means of two stay-screws I2 (Fig. 1.). By means of a head l3 on the screw and a bushing I4 fixed in the lower bearing box 4 each stay-screw is fastened in this bearing box, and by means of a nut l0, fixed in the upper bearing box 3 and provided with screw threads for the stay-screw, a screw connection is obtained which enables the desired change of the distance between the rolls. Because of the fact that the nut ill of the stay-screw has been placed in close proximity of the bushing it, that part of the stay.- screw which transfers the rolling pressure will become very short and consequently the resilience will be small, which fact is of decisive importance for narrow tolerancesof rolled material. In Fig. 1 the reference numeral l5 designates distance bars and I6 and I! an elastic suspension of the top roll, which eliminates the play in the threads and at the head I 3 of the stay-screws.

The stay-screws are synchronised by, for instance, a worm gear [8, [9 which isadapted to be turned by means of a handwheel 20, Figs. 4. and 5, or by an electric motor.

In Fig. 5 the bottom roll of the pair of rolls to the right is stationary, that is to say that its bearing boxes rest in the post for instance on adjusting screws 22, and may be immobilized by means of screw bolts 23. The top roll I consequently can be raised and lowered. At the pair of rolls to the left the case is opposite. Here the top roll i is stationary and the bottom roll 2 is adjustable as to the height, that is to say it hangs in the stay-screws i2.

lowered into place upon the posts.

The bars 25, 211' (Figs. 3, 6), which carry the conducting devices on the ingoing and outgoing sides Fig. 6) 28, 29 respectively, are for instance by means of bolts (Fig- 3. fixed directly in the bearing boxes, thus following the rolls,

7 when the latter are to be adjusted. 7

If the conducting devices consist of' separate lower scrapers and separate upper scrapers, it'is; notnecessary to adjust the conducting devices when the position of the rolls-is. changed. This is especially important in fore-pairs with adjust.-

.able bottom roll, in. which adjustment often must be done and in which the conducting device on the outside only consist of lower scrapers.

Also the bars 32, 34 (Fig. 6), which carry the cooling water tubes35, arefixed directly in the bearing boxes. All of the bars connect thebear- .ing. boxes'in such a manner that the axial adjustment will become. more. exact than with roll bearing, devices, which. are hitherto-usually employed. This axial adjustment. is. done by means .ofscrews 31 (Figs; 3 andd) As will be seenfrom the figures the screw heads act. upon the web 7 of the posts- The coristructionisquite.satisfactory also when. thestay-screws are setby means oia motorbetweeneach pass, the screws insuch case being. provided withlock nuts. tFig. 10) In order toenablev axialadjustment of one. roll relatively to. the. other the. bushing, M in Fig. 3V is provided with expansion holes. in the length direction ofthe rolls. 7 V

The bearing boxes. will nottbc so broad. as a roll 7 housing whereby'the conducting devices become more easily accessible. and it will be. easier to control that the conducting devices are. correctly po sitioned. Theposts'have been made. unilateral, that'is to say that they arelocated at only one side of. the. rolls, note.Figs.. 3, 4 and 6,. whereby the couplings. between the rolls are. accessible from oneside. V 7 a The cooling water. supply tubes. may be mounted in the posts and the coolingwater tubes in Figs; 6 and. 7 may be provided with: fixed splash plates 3'8. Thus. loose protection plates, wood blocks, waste and other provisional splash plates may be obviated. For the sake. of simplicity roll grooves; ifsuch exist, areshown'only in Fig. V Ina twin high mill the middle roll series is fixed asto. theheight. whereby universal couplings may be obviatedin this case, besides-rwhich" the distancehetween' the/pairs of rolls may bereduced which; is advantageous. when repeaters are used. InEig. 5 the middle rolli'series'isrrepresented by the bottom roll. .tothe right. and. the top roll to. the left. It's coupling necks'are connected bymeansof a. couplingatifl, see-Fig. 3. v

I Asthe cooling; water. tubes; also lighting. con-' dnctorswith contact. plugsior flexible: conductor 'lamps may be. fixed in the post.

as has been already said the posts have been fGl-med wtih:guiding surfaces, so that the: pairs 1 of rolls. may be completely mounted. and, provided 7 with conducting devices and cooling water supply tubes outsiderthe train. Thefexchange-foi rolls 4 therefore will become very easy and quick and is done as follows:

(a) The roll couplings are dismounted,

(b) The supply of cooling water is shut off,

(0) The old pair of rolls is lifted ofi,

(d) The new pair of rolls is pushed in ready state on the posts.

(e) The roll couplings are mounted,

(1 The cooling water iesuppliedi again.

In the case of the three high mill rolls according to Figs. 8 and 9 the middle roll la is supposed to be fixed, while the top roll and the bottom r011 are adjusted by their individual stay-screws 12. The bearing box may be carried and guided by posts in fundamentally the same manner as has been described above. The post has, however, a somewhat different profile from that described above. The top roll as well as the bottom roll hasa spring device l6, l1.

It is obvious that many changes may be made inthe. form and, construction of the. devices described without departing from the materialprincipl'es. of the invention. 7 7

Having now described my invention, what I claim as new and'desire tosecur'e by Letters Pat.- ent' is:

l. A rolling mill comprising a pair of bearing blocks, a roll-having end journals. journalled'in said bearing blocks, a. second pair. of. bearing blocks in superposed relation to. said first pair,

a second rollhavingend journalsv journal-led in the second pan of bearing blocks, stay screws roextending tatahly anchored. in and. restrainedfromv axial movement with respect to.fieach of the bearing blocks of the first pair and extending therefrom throughvertical bores in the bearing blocks. of the second pair, internally threaded bushing membersfixedly securedin thebores of saidsec- 0nd pair of bearing blocks and engaging said stay screws to maintain. the superposed bearing blocks in assembled relation, means for rotating said stay screws with respect-to said bushings, rigidcrosshar members secured directly to and ctween the: bearing." blocks of. each pair to..ma-intain-the same in: fixed spaced relation, a pair of stationary upright supporting standards disposed in parallel spaced relation, each. of the upright: supporting standards having a vertical guide flange thereon with the guide flange on one in opposed relation to and disposed in the same vertical plane as theiguide flange" on the other and said bearing blocks each having a vertical channel inthe outer end faces thereof adapted for vertical sliding engagement with the respective opposed guide flanges on said'upright standards to removablysupport the bearing block and roll assembly on said standards, the vertical channels in the end faces of the hearing blocks being ofiset to one: side of the axisof the'jcurna-ls therein.

2; A- rolling mill comprising a pair or axially V aligned bearing blocks, a roll having 'e-Iid' journals journailed insaid bearing blocks, a secondpair of axially aligned bearingblocks. in. superposed relationto said first. pair, a second roll having endjournals journalled the second pairpf 7 'bearingjblocks', vertically extending spaced parallel stay screws'm'oun't'ed' in and restrained from axial movement with respect to each of' the bearingblocks of the 'firstpa'in said second pair of bearing blocks each having spaced parallel vertical bores" therein through which said stay screws extend to mount the upper bearing blocks on the respective stay screws. of the lower bearing blocks, internallythreadedbushing members en gaging said stay screws and upper bearing blocks to maintain the superposed bearing blocks in assembled relation and to adjust the roll pressure, rigid crossbar members secured directly to and extending between the respective bearing blocks of each pair to maintain the same in fixed spaced relation, a pair of stationary upright supporting standards disposed in parallel spaced relation, each of the upright supporting standards having a vertical guide flange thereon with the guide flange on one in opposed relation to and disposed in the same vertical plane as the guide flange on the other and said bearing blocks each having a vertical channel in the outer end faces thereof adapted for vertical sliding engagement with the respective opposed guide flanges on said upright standards to removably support the bearing block and roll assembly on said standards, the vertical channels in the end faces of the bearing blocks being ofiset to one side of the axis of the journals therein.

3; A rolling mill comprising a self-contained removable bearing block and roll assembly unit including a pair of lower bearing blocks, a lower roll extending between said bearing blocks and having end journals, each journal mounted in the bearing of a bearing block, each of said bearing blocks having upstanding stay screws mounted thereon, an upper bearing block mounted on the stay screws of each lower bearing block, an upper roll extending between said upper bearing blocks and having end journals mounted in the bearings thereof, means threaded on said stay screws and engaging said upper bearing blocks to retain the same in position mounted on said stay screws and to adjust the roll pressure, rigid crossbar members secured directly to and extending between the bearing blocks of each pair to maintain the same in fixed spaced relation, said stay screws and cross bar members connecting said assembly in a self-contained unit, and means constituting the sole support for said unit including a pair of stationary upright supporting standards disposed in parallel spaced relation, each of the upright supporting standards having a vertical guide flange thereon with the guide flange on one in opposed relation to and disposed in the same vertical plane as the guide flange on the other and said bearing blocks each having a vertical channel in the outer end faces thereof adapted for vertical sliding engagement with the respective opposed guide flanges on said upright standards to removably support the bearing block and roll assembly unit on said standards, the vertical channels in the end faces of the bearing blocks being offset to one and the same side of the axis of the journals therein, whereby said bearing blocks are unsupported at the other side of said axis.

SVEN ERIK MALTE NORLINDH.

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

UNITED STATES PATENTS Number Name Date 165,094 Hahn June 29, 1875 195,859 Voith Oct. 2, 1877 208,949 Baldwin Oct. 15, 1878 260,174 Durfee June 27, 1882 693,031 Kennedy Feb. 11, 1902 706,993 Nighman Aug. 12, 1902 722,022 Huston Mar. 3, 1903 991,070 Keller May 2, 1911 1,203,888 McKibbin Nov. 7, 1916 1,796,447 Foren Mar. 17, 1931 1,814,736 Palmgren July 14, 1931 2,005,168 Rose June 18, 1935 2,200,837 Fass May 14, 1940 2,277,740 Yoder Mar. 13, 1942

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