US3433045A

US3433045A - Rolling mill apparatus

Info

Publication number: US3433045A
Application number: US524311A
Authority: US
Inventors: Alexander Ian Wilson
Original assignee: Hille Engineering Co Ltd
Current assignee: Hille Engineering Co Ltd
Priority date: 1965-02-04
Filing date: 1966-02-01
Publication date: 1969-03-18
Anticipated expiration: 1986-03-18
Also published as: DE1527643A1; SE302943B; BE676073A; GB1119581A

Description

March 18, 1969 A. WILSON 3,433,045

ROLLING MILL APPARATUS Filed Feb. 1, 1966 Sheet of s INVENTOR FIG. I ALEXANDER IAN WILSON By M V ATTORNEYS March '18, 1969 A. 1. WILSON ROLLING MILL APPARATUS Sheet Filed Feb. 1. 1966 fi' nV- n m n m m m ltl r l 5 w I I MMN HIH M q T W fi v. i G A 7 w i n w: m 5 $19 a x a w g 4% f f mum )IL/ U 2 & a m M. w

March 18, 1969 A. 1. WILSON 3,433,045

ROLLING MILL APPARATUS Filed Feb. 1. 1966 Sheet 3 of 5 I NVENTOR ALEXANDER IAN WILS N ATTORN EYE March 1969 A. 1. WILSON 3,433,045

ROLLING MILL APPARATUS Filed Feb. 1. 1966 Sheet 4- of 5 IN VENTOR ALEXANDER IAN WILSON m: M M

ATIO IE NE YS March 18, 1969 A. I. WILSON 3,433,045

ROLLING MILL APPARATUS Filed Feb. 1, 1966 INVENTCR ALEXANDER IAN WILSON FIGQ 87; My

ATTORNEYS United States Patent Claims priority, application Great Britain, Feb. 4, 1965,

4,907 65 US. Cl. 72-239 8 Claims Int. Cl. B21b 31/10 ABSTRACT OF THE DISCLOSURE The invention is concerned with rolling mills having at least two rolls. The rolls comprise sleeves mounted on intermediate portions of roll shafts. A bearingforming part of an end mounting is mounted on each roll shaft. One end mounting of each roll shaft is carried by a movable structure. That structure is movable axially of the roll shaft to enable the end mountings to clear the ends of the shafts. Means is provided to support the movable structure during such axial movement. And means is provided for moving the structure away from the ends of the shafts to enable the sleeves to be withdrawn from the shafts without having to remove the shafts themselves. This makes it possible very conveniently and very quickly to remove a roll sleeve and replace it by another, e.g., when the sleeve has become worn or, e.g., when it is desired to roll a product of a different shape or thickness.

The invention relates to rolling mill apparatus.

The object of the invention is to provide rolling mill apparatus in which shut-down time between different rolling operations is reduced to a minimum, that is to say, in which sleeves which constitute working lengths of the rolls can very easily and quickly beremoved for replacement by new or alternative sleeves when worn or when it is desired to roll a different cross-section of rolling mill product.

According to the invention, rolling mill apparatus includes at least one pair of rolls mounted at their opposite ends in respective bearings, a working length of each roll between said bearings being surrounded by a sleeve which is removable from the roll, for replacement by a new or alternative sleeve, when it has become worn or when it is desired to roll a different cross-section of rolling mill product, one of the bearings being removable from the roll and at least a portion of associated structure carrying said bearings being movable to allow the sleeve to be removed from the roll without the necessity for said roll to be removed from the mill. The other of the bearings is preferably capable of supporting the roll during the replacement of the sleeve when said one of the bearings has been removed therefrom. Alternatively, means for supporting the roll when said one of the bearings has been removed may be constituted by a supplementary bearing encircling an extension of the roll at its end remote from the bearing which is removable, or may be constituted by an abutment member capable of acting downwardly on said extension to limit downward movement of the unsupported end of the roll. The bearing which is removable when the sleeve is to be replaced preferably encircles a portion of a clamping collar which abuts against the end of said sleeve so that when the clamping collar has been released fromthe roll said collar together with said bearing and structure in which the latter is mounted can be moved clear of the roll shaft simultaneously. The clamping collar is preferably provided with an internally screwthreaded length for engagement with a screwthreaded length of the roll shaft,

3,433,945 Patented Mar. 18, 1969 and the screwthread is preferably of special form, its opposite flanks having unlike angles of inclination. Preferably, also, the ends ,of the bore of the sleeve are flared for co-operation with a conical portion of the roll shaft (or a bush mounted thereon) and a conical, nose portion of the clamping collar respectively. Preferably, the portion of the bearing mounting structure associated with the bearing which is removable from the roll is initially movable axially of the roll for a distance to ensure that the clamping collar can clear the end of the roll, and is then movable to one side or the other, preferably suspended from a hinged member. Said hinged member is preferably a guide rail on to which the removable structure carrying the clamping collar is slidable as the initial movement is effected. Alternatively, the portion of the structurewhich is removable is suspended from a jib pivotallyconnected to the apparatus and, to allow the initial axial movement, the movable structure is suspended from the jib by means of a roller which rides on a horizontal track adjacent the free end of the jib. In the latter case, the bearing mounting structure associated with the bearing which is removable from the roll may be movable in its entirety prior to the sleeve being replaced, so that, when the apparatus is re-assembled, said structure is preferably bolted to fixed structure in which the other bearings are housed, separated therefrom by spacer members. In a different construction embodying the invention, the removable structure may comprise a housing containing a window for the reception of a pair of roll chocks, said housing being capable of being bolted to an apertured frame member through the aperture of which the sleeves can be passed. In a preferred construction, however, the removable structure includes only a pair of roll chocks, the upper one of which is provided with T-slots for the connection of suspension rods for holding it in abutment with a clamping screw. The sleeves are preferably keyed on the roll shafts.

In order that the invention may be fully understood and readily carried into effect, a preferred embodiment thereof will now be described, by way of example only, with reference to the accompanying drawings, of which:

'FIG. 1 is a part-sectional front elevation of rolling mill apparatus embodying the invention,

FIG. 2 is a part-sectional view in the direction of the arrow 2 in FIG. 1, and

FIG. 3 is a sectional view on the line 33 in FIG. 2,

FIG. 4 is a front elevation of further rolling mill apparatus embodying the invention,

FIG. 5 is a view in the direction of the arrow 5 in FIG. 4,

FIG. 6 is a plan view, and

FIGS. 7-9 are sectional views which will hereinafter be referred to.

Referring now to FIGS. 1-3 of the drawings, rolling mill apparatus includes frame structure generally indicated 10, an inner housing 11 of which is bolted to one side of a so-called cabinet 12 and an outer housing 13 of which is spaced from the inner housing by spacer members (not shown). Said frame structure contains a pair of

rolls

14, 16 and the cabinet 12, into which

respective roll shafts

18, 20 of said rolls extend, contains driving gear (not shown) for transmitting drive to said rolls from a motor (not shown).

Since the construction of the two rolls is identical, the construction of the roll 14 only will now be described. A working length of the roll shaft of the roll 14 is surrounded by a sleeve 22 the bore of which is flared at each end for co-operation with a conical bush 24 mounted on the shaft (in abutment with a flange 25 integral with said shaft) and with a conical nose portion of a clamping collar 26. A key prevents rotation of the sleeve on the shaft.

The clamping collar 26 has an internally screwthreaded inner length for engagement with a screwthreaded length 28 of the roll shaft, and also an internally plain intermediate portion which is a close running fit on a plain portion 30 of said shaft. An outer length 32 of the roll shaft is provided with means including a key 34 whereby the clamping collar can be secured non-rotatably on the roll shaft after it has been screwed tightly into abutment with the sleeve.

The roll shaft 18 of the roll 14 is mounted in roller bearings 36, four of which are carried in a roll chock 40 mounted in the housing 11 and embrace a portion 38 of the shaft and two of which are carried in a roll chock 42 mounted in the housing 13 and embrace the sleeve 22. The roll chocks 40 and 42 (hereinafter termed upper roll chocks) are slidably disposed in so-called windows 44 in the

housings

11 and 13, and the

lower roll chocks

46 and 48 are also disposed in said windows, being seated on respective blocks 50.

Respective clamping screws 51 and 52, screwthreaded lengths 53 of which engage respective nuts 55 let into the

housings

11 and 13, act upon the upper roll chocks through the intermediary of respective dome-headed bearing pads 54, and conventional screw-down gear (not shown) is provided for rotating said screws. A pair of bolts (not shown) depend from a yoke 56 which is rotatably connected to an upper part of the clamping screw 51 and, extending freely through the upper portion of the housing 11 into the window therein, engage the chock 40 to suspend it in known manner in abutment with the lower end of said screw. A similar pair of bolts 58 depend from a yoke 60 which is rotatably connected to an upper part of the clamping screw 52 and said bolts extend freely through the upper portion of the housing 13 into the window therein. At their lower ends, said bolts 58 engage special nuts 62 which are slidably accommodated in T- slots 64 in the chock 42 and suspend the latter in abutment with the lower end of the screw 52.

Respective guide blocks

66 and 68 are bolted to the

roll chocks

42 and 48, said guide blocks being provided with dovetail guides 70 and 71, and respective hinged

members

72 and 73, provided with dovetail guiderail sections 74, are pivotally connected to the housing 13 about

respective pivot pins

76 and 77.

The arrangement is such that said hinged members can be swung from a stowed position in which they lie alongside the housing 13 (as shown in chain-dotted lines in FIG. 3) to the position shown in full lines wherein said guide-rail sections are aligned with the dovetail guides in the guide blocks. The means whereby the clamping collars 26 of the rolls are secured non-rotatably on their respective roll shafts can then be released as shown in FIG. 3 so that, after the tension in the bolts 58 has been released, said collars can be unscrewed, simultaneously displacing the roll chocks 42 and 48 from the window 44 of the housing 13 as the guide blocks engage and slide along the hinged members 72. It will of course be understood that as the chocks are displaced from the window 44, the nuts 62 slide out from the T-slots 64 in the upper chock 42.

When the collars 26 have been fully unscrewed from the screwed portions 28 of the roll shafts, the chocks can be manually displaced along the hinged members for a distance to ensure that the clamping collars can clear the ends of the roll shafts and can then be swung aside suspended on said hinged members which once again assume their stowed positions. When the clamping collars and their removable associated structure have thus been moved aside, the sleeves 22 can easily be removed from the exposed ends of the roll shafts through the window 44, for replacement by new or alternative sleeves depending upon whether the sleeves have become worn or whether it is desired to roll a different cross-section of rolling mill product. :It will, of course, be understood that the four bearings which surround the portion 38 of each roll shaft are quite capable of supporting said shaft and the sleeve 22 which it carries without any additional support. The removable structure is replaced as soon as the sleeves have been changed and the mill is thus ready to resume working after the very minimum of down time.

The hinged member 73 associated with the lower roll chock 48 is maintained at a constant height in alignment with the dovetail guide 71 in said chock. The hinged member 72, however, is suspended so that, as roll gap adjustments cause the upper roll chock to move up or down, said hinged member is maintained in alignment with the dovetail guide '70. The means by which the hinged member associated with the upper roll chock 42 is suspended include an internally screwthreaded bush 80 which is secured within a boss 82 welded to the housing 13 and with which a screwthreaded length of the pivot pin 76 is engaged. A pinion 84 is secured to the upper end of said pivot pin and meshes with a gear wheel 86 secured on the clamping screw 52.

The lead of the screwthread of the pivot pin 76 is slower than the lead of the screwthread 53 of the clamping screw 52 in the ratio between the pinion 84 and gear wheel 86, so that when the clamping screw moves up or down, the pivot pin moves with it by the same amount. The lower end of the pivot pin 76 is provided with a nut 78 and locknut 88 which abut against the underside of the hinged member 72.

Referring now to FIGS. 4-6 of the drawings, in further rolling mill apparatus embodying the invention frame structure generally indicated is constituted by an inner housing 111 and an outer housing 113 spaced apart by spacer members 114, the housing 113 being releasably connected to the spacer members. The frame structure is bolted to one side of a cabinet 112 containing gearing (not shown), and said gearing is drivably connected to an electric motor 115, mounted on the cabinet 112, by means of a belt pulley drive 117.

The frame structure contains a pair of

rolls

14 and 16 which are identical to those of the previously described embodiment and so do not need to be described in detail. The rolls are also mounted in the identical manner previously described in respective roll chocks (not shown) in the housing 111 and respective roll chocks 42 and 48, in the housing 113. As in the previously described arrangement, clamping screws (not shown) act upon the chocks in which the upper roll is mounted and conventional screw-down gear, including

respective gear wheels

157 and 159 meshing with a common pinion 161, is provided for adjusting the roll gap.

In the present case, however, the removable structure comprises the entire housing 113 complete with the chocks and the parts of the screwdown gear mounted therein. For the purpose of facilitating the removal of this structure, a jib 119 is pivotally connected to the cabinet, and a horizontal track 121 adjacent the free end of the jib carries a roller 123 which is freely rotatable between the upper ends of a pair of brackets 125 bolted on the housing 113.

The arrangement is such that when the housing has been released from the spacer members and the collars have been fully unscrewed from the roll shafts, the removable structure can be withdrawn (as shown in chaindotted lines in FIGS. 4 and 6) axially of the rolls until the collars are clear of the roll shafts. (The track 121 is provided with a raised end 131 constituting a stop to limit the extent of withdrawal.) The removable structure can then be swung aside to allow the sleeves of the rolls to be removed for replacement by new or alternative sleeves. Various modifications may be made without departmg from the scope of the invention. For example, the way in which the clamping collars are urged into abutment with the sleeves may be modified in .a number of ways, but a modification which is thought to be particularly advantageous is shown in FIG. 7.

Referring now to FIG. 7, the clamping collar 26 is shown to 'be screwthreaded on the roll shaft by means of a screwthread of special form which extends substantially for the full effective length of said collar, that is to say, it extends through the bearings which encircle the collar.

The special form of screwthread has opposite flanks of unlike angles of inclination as shown in the drawing. Thus the flanks of the thread facing towards the sleeve have angles of inclination of thirty degrees to the axis of the roll shaft, that is to say, the same angle as the conical end of the collar. The flanks of the threads facing away from the sleeve on the other hand are almost radial to the axis of the roll shaft. The thread is very similar in appearance to the well-known buttress thread but, unlike the buttress thread, when the clamping collar is tightened and the thread is under load, the compressive forces are applied to the flanks which are inclined at a relatively shallow angle to the axis of the roll shaft. For this reason it is thought that the forces which are applied to the sleeve during a rolling operation, and transmitted to the roll shaft by way of the clamping collar, will be transmitted to the shaft through a much improved bearing surface. The sleeve is therefore likely to be held concentric with the axis of the roll shaft in a much more effective manner than is the case when the screwthread is of conventional form. The flanks of the thread which are inclined at a relatively shallow angle can of course be ground to improve accuracy even further. It will of course be understood that the flanks facing the sleeve need not be inclined exactly at the angle of inclination of the conical end of the clamping collar, and it may be found advantageous to make the screwthreads on the two roll shafts of opposite hand so that during a rolling operation the clamping collars tend to tighten against the sleeves. Means will, of course, be provided for locking the clamping collar in position and the thread will preferably be provided with a relatively fast thread. It may even be a multistart thread.

Other modifications which could be made are shown in FIGS. 8 and 9. In FIG. 8, the previously described larrangement has been modified by the screwthreaded length of the roll shaft being located adjacent the end of the shaft. The nose portion of the clamping collar 26 is a sliding fit on the part of the shaft which is surrounded by the sleeve.

In FIG. 9, the clamping collar 26 is provided with an outer transverse wall 127 and is urged tightly into abutment with the sleeve by means of two set screws 129 which extend through said wall and engage screwthreaded holes in the end of the roll shaft. The nose por tion of the clamping collar is again a sliding fit on the part of said shaft which is surrounded by the sleeve.

Varius other modifications may be made without departing from the scope of the invention. For erample, the clamping collars could be urged into abutment with the sleeves by means of cotters. Furthermore, the housing 13 could be replaced by an apertured frame member, said frame member being provided with a subhousing containing a window for the reception of the

chocks

42 and 48. The removable structure would then comprise the sub-housing together with said chocks and the clamping collars rotatably mounted therein, and the sleeves would be passed through the aperture in the frame. In a further modification, means for supporting the rolls when one of the bearings has been removed from each roll may be constituted by supplementary bearings encircling extensions of the roll shafts at their ends remote from the bearings which are removable, or may be constituted by abutment members capable of acting downwardly on said extensions to limit downward movements of the unsupported ends of the rolls.

It will of course be understood that the invention can equally well be applied to a 3-high or a 4-high mill.

What I claim is:

1. A rolling mill comprising a frame; at least a pair of co-operating roll shafts; sleeves surrounding intermediate lengths of said roll shafts; an end mounting including a bearing mounted on each end of said roll shaft; and movable structure carrying one of the end mountings of each roll shaft; means for supporting said movable structured during movement in the direction of the axis of said roll shaft for said end mounting to be removed from the roll shaft; and means for moving said movable structure away from the end of said roll shafts to permit the sleeves to be withdrawn without the necessity for said roll shafts to be removed from the mill.

2. A rolling mill as claimed in claim 1 comprising in addition camping collars abutting against ends of said sleeves; each end mounting carried by said movable structure surrounding one of said clamping collars.

3. A rolling mill as claimed in claim 2 comprising in addition co-operating screw threads on said roll shafts and interiorly of said clamping collars for screwthreaded connection therebetween, unscrewing of said clamping collar causing movement of said end mounting in the direction of the axis of said roll shaft.

4. A rolling mill as claimed in claim 3 comprising in addition flanks upon said screwthreads, opposite flanks of said screwthreads having unlike angles of inclination and the flanks which are operative to urge said clamping collars into abutment with said sleeves having angles of inclination substantially the same as those of conical nose portions of said clamping collars.

5. A rolling mill as claimed in claim 2 comprising in addition an outer transverse wall at an end of at least one of said clamping collars remote from the end thereof in abutment with said sleeve; and at least one screw extending through said transverse wall and engaging a screwthreaded hole in said shaft for urging said collar into abutment with said sleeve.

6. A rolling mill as claimed in claim 1 also comprising positioning means associated with said means for moving said movable structure away from the end of said roll shaft, said positioning means being for permitting the last mentioned means to move said movable structure sideways relative to the axis of the roll shaft.

7. A rolling mill as eaimed in claim 6 comprising in addition a jib from which said movable structure is suspended for permitting said movement of the movable structure in the direction of the axis of said roll shaft and for moving said structure sideways relative to the axis of said roll shaft.

'8. A rolling mill as claimed in claim 7 comprising in addition pivot means for mounting said jib above the frame; and a roller riding on a horizontal track on said jib and from which said removable structure is suspended.

References Cited UNITED STATES PATENTS 2,064,453 12/ 1936 Wheeler 72-238 2,226,649 12/1940 Yoder 72-238 2,599,414 6/1952 Rodder 72-238 3,042,996 7/1962 Nelson 29-123 3,204,443 9/1965 Kalberkamp 72-239 3,298,215 1/ 1967 Bonhoif 72-238 CHARLES W. LANHAM, Primary Examiner. A. RUDERMAN, Assistant Examiner.

US. Cl. X.R.