US3675455A

US3675455A - Roll stand with working rolls supported in chocks

Info

Publication number: US3675455A
Application number: US107921A
Authority: US
Inventors: Erich Bretschneider
Original assignee: Siemag Siegener Maschinenbau GmbH
Current assignee: Siemag Siegener Maschinenbau GmbH
Priority date: 1970-01-22
Filing date: 1971-01-20
Publication date: 1972-07-11
Anticipated expiration: 1989-07-11
Also published as: BE761779A; ZA708719B; GB1287073A; ES386850A1; FR2077268A1; FR2077268B1

Abstract

The invention relates to a roll stand, with working rolls supported in chocks, the rolling forces of which are absorbed by tension strap members adapted to act on said chocks and which are adjustable relative to each other for the purpose of adjusting the roll gap by means of eccentrics engaged in the tension strap members.

Description

United States Patent Bretschneider [451 July 11, 1972 1541 ROLL STAND WITH WORKING ROLLS SUPPORTED IN CHOCKS [72] Inventor: Erich Bretschnelder. Buderich. Germany [73] Assignee: Sienna Slegener Mmchlnenbau G.m.b.H.

[22] Filed: Jan. 20, 1971 [2|] Appl.No.: 107,921

3,309,909 3/!967 Wilson ..72/237 Primanxaminer-Milton S. Mehr Anomey-Henry C. Westin [30] Foreign Application Priority Data [57] ABSTRACT 1970 Germany 20 02 745-6 The invention relates to a roll stand, with working rolls supported in chocks. the rolling forces of which are absorbed by g; g 'gg lrg tension strap members adapted to act on said chocks and {58] Field of Search ..72/238, 239, 244, 241. 237 adjusable lame m each f the ad usting the roll gap by means of eccentrics engaged in the tension strap members.

8 Chins, 6 Drawing Figure:

1D 33 i2 1 i 53 1 i 20 8 l A g e- M .i if. 17 1? 3 l 9 32 l Q42 1 1 i 2 1O 33 H 3 PATENTEDJUL 1 1 11112 3. 675.455

SHEET 10F 3 1. s 9 7 10,11 11. 2e 1. Fig.1 In! 10,11

2\ 247 10,11 10,11 9 5 9 1a 2a U 5 INVENTOR.

E. Bae'rscHwswea HENRY c. WEsT'IN P'ATENIEnJuL 1 1 1972 saw 30F 5 R KEW OmT e WWW we Ev- M 5 E ArroR/ Y ROLL STAND WITH WORKING ROLLS SUPPORTED IN CIIOCKS Two-high horizontal roll stands of this construction are already known as so-called Wilson stands. In these stands the chocks are provided with horizontal studs which extend transversely to the appropriate roll axis. The two superjacently disposed studs of the equally superjacently disposed chocks are joined to each other by means of a strap member. An eccentric bush, which may be rotated for the purpose of adjusting the rolls, is provided between the strap member bore and the stud.

This construction of the so-called "Wilson stands results in a lightweight, but very stiff design. However, roll changing for resetting the stand is awkward in the aforementioned "Wilson" stands. This is due to the fact that not only the rolls rogether with their blocks, but also the strap members including all adjusting means must be dismantled. Should it be necessary to separate the rolls from the chocks it is also necessary to dismantle the strap members as well as the adjusting elements. Accordingly, roll changing is difficult to perform and is time-consuming.

The prior art also discloses so-called Norlindh stands. These are also two-high roll stands, but the power flow between the upper and lower chock is provided by means of screws and nuts instead of tension strap members. A lightweight, but stiff construction of the stand may also be achieved by these means. However, it is a disadvantage in comparison with the Wilson stands that the Norlindh" stands do not permit self-aligning adjustment of the chocks. Accordingly, canting of the roll journals in the bearings cannot be avoided in the event of roll flexure. Moreover, the strap members of the so-called Wilson" stands may have a larger cross section than the bolts of the Norlindh" stands so that stretch of the entire system in Wislon" stands is less than that in the Norlindh stands.

It is a particular disadvantage ofNorlindh stands that the adjusting means are accommodated in the chocks. This results in a particularly expensive construction because the adjusting means must be exchanged in each case when the roll sets are changed.

Three high stands which can be developed into a universal rolling mill by the insertion of vertical rolls have also been disclosed as a further development of the so-called Norlindh stands. By contrast, known Wilson" stands can be constructed only as two-high roll stands owing to the use of tension strap members as direct connecting elements between the chocks.

Based on the initially described construction of the socalled Wilson stands, it is the object of the invention to provide a roll stand construction which permits roll stand construction which permits roll changing or resetting of the stand without the need for removing the adjusting means and tension strap members from the stand and which also enables universal roll stands with horizontal and vertical roll sets to be provided.

According to the invention, this problem is solved substantially in that the checks are guided between two parallel frames in which one tension strap member each for each chock is suspended in that an eccentric constantly engaged in each tension strap member is supported in the frame for each such tension strap member and that slidable bolts are disposed in the checks and are adapted for optional engagement and disengagement, respectively, with the tension strap members by means of adjusting apparatus.

The inventive incorporation of the guide frame for the chocks into the power flow between the roll sets provides not only the advantage of enabling the adjusting means for the rolls to remain in the stand when the rolls are changed or the stand is reset, but also enables the frames to be so constructed that a vertical roll set may be inserted into the frame in addi tion to a horizontal roll set in order to form a universal roll stand. Coupling and uncoupling of the chocks with the tension strap members can be rapidly and simply performed by means ofslidable bolts which are disposed in the chocks.

According to the invention, it has also been found advantageous if the tension strap apertures into which the connecting bolts of the chock engage are formed by eccentric bushes adapted to rotate in said tension strap members. The aforementioned eccentric bushes permit course adjustment of the roll sets relative to each other to be performed manually prior to commencing the rolling program.

The eccentrics disposed in the frames are adjustably coupled to a common transmission to enable the precise roll gap adjustment during rolling operation. To this end and in accordance with a further feature of the invention, the adjusting apparatus for the eccentrics disposed in the frame may be formed by self-arresting transmissions, for example, worm gear transmissions, coupled to each other through shafts and intermediate angle drives.

It is particularly advantageous if the parallel frames are supported on one side with a defined distance on a common base cross member and are, on the other side, retained at a defined distance by two upper, removable cross members. Finally, it is of significance for the invention that tension strap members for a universal roll set comprising two horizontal rolls and two vertical rolls are suspended in the frames, the frames for the checks of the vertical rolls having supporting guides.

The inventive construction of a roll stand is far superior to that of conventional roll stands. For example, while a weight of 82 tons is required for a universal roll stand of conventional construction having horizontal rolls of 900 mm. diameter and vertical rolls of 550 mm. diameter, it is possible for a universal roll stand according to the invention to be constructed with a weight of only 28 tons. A conventional two-high roll stand with rolls of550 mm. diameter and L000 mm. length will hat e an overall weight of 36 tons while a two-high roll stand according to the invention can be constructed with a weight of only 18 tons. Nevertheless, the roll stands constructed in accordance with the invention are twice as stiff as conventional constructions. The stand module in terms of tons/mm. in stands according to the invention is twice as large as in conventional roll stand constructions, that is to say, if the stretch of a conventional roll stand amounts to 350 tons/mm, the same value in the novel stand will be 700 tons/mm.

Two embodiments of the present invention are illustrated in the drawings in which:

FIG. I is an universal roll stand according to the invention as seen along the general orientation of the rolling axis,

FIG. 2 is a plan view of the universal roll stand according to FIG. 1,

FIG. 3 is a section along the line llllll of the universal roll stand shown in FIGS. I and 2,

FIG. 4 is a two-high roll stand constructed in accordance with the invention as seen along the general orientation of the rolling axis,

FIG. Sis a plan view of the two-high roll stand, and

FIG. 6 shows the two-high roll stand as seen along the direction of the arrow VI.

The universal roll stand illustrated in FIG. I to 3 of the drawing incorporates two

identical frames

1 and 2, extending in parallel to each other and being disposed opposite each other at a distance and in a mirror image. They are supported equal distances relative to the orientation of the rolling axis on a common base cross member 3 and are, moreover, joined to each other at the top by means of two removable cross members 4.

Two upper eccentric bolts 5 and two lower eccentric bolts 6 are rotatably inserted into each of the

frames

1 and 2, each of the said eccentric bolts 5 forming the support for one strap member 7 and each of the eccentric bolts 6 forming the sup port for one strap member 8. One eccentric bush 9 each is inserted into the free ends of the

strap members

7 and 8. The eccentric bushes 9 of the

strap members

7 and 8 represent en gagement apertures for axially slidable bolts 10 and II which are guided in each of the chocks l2 and I3 for the horizontal rolls l4 and I5. Wormwheels 16 in mesh with worms 17 are non-rotationally connected to the

eccentric bolts

5 and 6, as

clearly shown in FIG. 3. A motor 18 is provided for the common drive of all worms 17 to enable synchronous adjustment of all

eccentric bolts

5 and 6 to be obtained.

The chocks l9 and 20 for the vertical rolls 2] and 22 are suspended in the

frames

1 and 2 by means of strap members 23 in the same way as the chocks l2 and 13 for the horizontal rolls l4 and 15. To this end the strap members 23 are supponed in the

frames

1 and 2 on eccentric bolts 24 and 25 whose construction is identical to that of the

eccentric bolts

5 and 6. The eccentric bolts 24 and 25 are provided with transmissions identical to those of the eccentric bolts 5 and which are drivingly connected by means of a keyed wormwheel 16 to a worm 17. A motor 26 ensures synchronous adjustment of all eccentric bolts 24 and 25 in the two

frames

1 and 2.

While the chocks I2 and 13 for the horizontal rolls I4 and are guided directly between the smooth internal surfaces of the two

frames

1 and 2, the

frames

1 and 2 are provided with horizontally extending recesses 27 which form supporting guides for the chocks I9 and of the vertical rolls 2] and 22.

In the same way as the

strap members

7 and 8 for the horizontal rolls l2 and 13, the strap members 23 for the

vertical rolls

21 and 22 are provided with eccentric bushes 9 functioning as engagement means for slidable coupling bolts 10 and II which are slidably guided in the chocks l9 and 20.

The worms I7 adapted to adjust the

eccentric bolts

5 and 6 through the worrnwheels 16 are all drivingly connected to each other through shafts 28 and angle drives 29. In the same way the worms, adapted to drive the eccentric bolts 24 and through corresponding wormwheels, are also in permanent driving connection with each other through shafts 30 and 31 and through angle drives 32,

When the roll sets l4, l5 and 21, 22 are to be inserted into the roll stand, the bolts 10 and ll, slidably guided in the chocks I2 and 13 or 19 and 20, respectively, are first retracted by central adjusting apparatus 33 disposed in the aforementioned chocks. After the roll sets l4, l5 and 21, 22 together with their chocks l2, l3 and 19, 20 have been inserted between the two frames I and 2, the bolts 10 and I] are ad vanced by means of the central adjusting apparatus 33 to opposite sides from the chocks until they engage with the eccentric bush 9 as clearly shown in FIG. 3. By manual rotation of the eccentric bushes 9, it is possible to obtain coarse adjustment of the roll gap for the roll sets before the roll stand is taken into operation.

Precise roll adjustment on the other hand is obtained by corresponding rotation of the

eccentric bolts

5, 6 and 24, 25 which are rotatably sup orted in the

frames

1 and 2.

To change the rolls or to reset the stand, it is therefore merely necessary for the

bolts

10 and 11, slidably guided in the chocks, to be withdrawn from the eccentric bushes 9 by means of the central adjusting apparatus 33 in order to enable the roll sets I4, 15 and 21, 22 together with their chocks l2 and 13 or 19 and 20, respectively, to be removed. Conversely, coupling of the newly inserted roll sets with the tension strap members, adjustably supported in the frames I and 2, merely requires the bolts 10 and II to be advanced by means of the central adjusting apparatus 33.

The twohigh roll stand illustrated in FIGS. 4 to 6 of the drawing differs from the universal roll stand illustrated in FIGS. I and 3 substantially only by virtue of the fact that no vertical roll fittings are provided and that, accordingly, the tension strap members and adjusting means associated therewith are also omitted.

Resetting of the aforementioned two-high roll stand in all other respects is performed in the same way as for the universal roll stand illustrated in FIGS. 1 to 3, that is to say, it is merely necessary for the bolts 10 and I1. slidably guided in the chocks l2 and 13, to be disengaged from the eccentric bushes 9 of the

strap members

7 and 8 when it is desired to remove the roll set or for said bolts 10 and II to be correspondingly re-engaged after the new roll set has been inserted into the stand.

For the substantially T-shaped construction of the chocks l2 and I3 for the horizontal rolls l4 and I5, as illustrated in FIGS. 1 to 6, it is necessary for the lower horizontal roll I5 together with its chocks 13 to be dismantled downwardly in the stand. To enable even the lower horizontal roll 15 together with its chocks 13 to be dismantled upwardly in the same manner as the upper horizontal roll l4 together with its chocks 12, it will be necessary for another construction to be selected for the chocks I3. In this case they may have either only a rectangular contour of the lower chocks must be assembled from a broad and narrow part, the narrow part being easily, detachably joined to the broad part. The vertical roll set of the universal rolling stand illustrated in FIGS. I to 3 is removed to both sides of the stand.

In accordance with the provisions of the patent statutes, l have explained the principle and operation of my invention and have illustrated and described what I consider to represent the best embodiment thereof.

I claim:

1. A rolling mill comprising:

a pair of frames,

a pair of working rolls having chocks mounted on their opposite ends in which the adjacent chocks of different rolls are guided in each frame,

a tension strap member for each chock from which each chock is suspended in a manner that the strap members absorb the rolling forces of said rolls,

means carried by said frames engaging each tension strap member,

means for adjusting said engaging means for adjusting one roll relative to the other,

means disposed in said chocks and having portions 0p tionally engageable and disengageable with said strap members, and

means for effecting said engagement and disengagement.

2. A rolling mill according to claim 1 in which said tension strap members include apertures,

eccentric bushing, received in said apertures, and

said means disposed in said chocks including connecting members extending from said chocks into said eccentric bushings wherein said eccentric bushings are rotatable to permit additional adjustment of said working rolls relative to each other.

3. A rolling mill according to claim 1 in which said engaging means comprise eccentrics for each strap member for sup porting said strap members, and

a common drive means for rotating said eccentrics.

4. A rolling mill according to claim 3 wherein said common drive means includes inter-connecting transmission means for synchronizing rotation ofsaid eccentrics.

5. A rolling mill according to claim 1 wherein said pair of frames comprises two spaced-apart housings,

a common base for supporting said housings at one side thereof and at a fixed spaced-apart distance, and

two removable cross members for retaining said housings on the other side thereof at a fixed spaced-apart distance.

6. A rolling mill according to claim 1 wherein said working rolls are horizontal rolls,

two vertical rolls arranged on opposite sides of the steel line of said mill cooperating with said horizontal rolls to form a universal rolling mill stand,

said vertical rolls having chocks mounted on their opposite ends,

a tension strap member for each chock of said vertical rolls in which each chock is suspended in a manner so as to absorb the rolling forces ofsaid vertical rolls, and

said frames having guiding surfaces formed therein for receiving the chocks of said vertical rolls and allowing them to move towards and away from each other in a horizontal direction.

7. A rolling mill according to claim 6, including means carried by said frames engaging each tension strap member of said vertical rolls, and

6 means for adjusting said engaging means for said vertical eccentrics mounted in said strap members for adjusting said rolls for adjusting said vertical rolls relative to each other, strap members f id vertical rolls and, hence, effecting means disposed in said checks of said vertical rolls and havddi i l dj tm nt of aid vertical rolls,

"8 Forums engageable and dsengageable said engaging means of said vertical rolls including other ecwith said tension strap members of said vertical rolls, and 5 means for efi'ecting said engagement and disengagement of said means disposed in said chocks of said vertical rolls. 8. A rolling mill according to claim 7, including centrics adapted to carry said strap members, and common drive means for rotating said other eccentrics

Claims

1. A rolling mill comprising: a pair of frames, a pair of working rolls having chocks mounted on their opposite ends in which the adjacent chocks of different rolls are guided in each frame, a tension strap member for each chock from which each chock is suspended in a manner that the strap members absorb the rolling forces of said rolls, means carried by said frames engaging each tension strap member, means for adjusting said engaging means for adjusting one roll relative to the other, means disposed in said chocks and having portions optionally engageable and disengageable with said strap members, and means for effecting said engagement and disengagement.

2. A rolling mill according to claim 1 in which said tension strap members include apertures, eccentric bushing, received in said apertures, and said means disposed in said chocks including connecting members extending from said chocks into said eccentric bushings wherein said eccentric bushings are rotatable to permit additional adjustment of said working rolls relative to each other.

3. A rolling mill according to claim 1 in which said engaging means comprise eccentrics for each strap member for supporting said strap members, and a common drive means for rotating said eccentrics.

4. A rolling mill according to claim 3 wherein said common drive means includes inter-connecting transmission means for synchronizing rotation of said eccentrics.

5. A rolling mill according to claim 1 wherein said pair of frames comprises two spaCed-apart housings, a common base for supporting said housings at one side thereof and at a fixed spaced-apart distance, and two removable cross members for retaining said housings on the other side thereof at a fixed spaced-apart distance.

6. A rolling mill according to claim 1 wherein said working rolls are horizontal rolls, two vertical rolls arranged on opposite sides of the steel line of said mill cooperating with said horizontal rolls to form a universal rolling mill stand, said vertical rolls having chocks mounted on their opposite ends, a tension strap member for each chock of said vertical rolls in which each chock is suspended in a manner so as to absorb the rolling forces of said vertical rolls, and said frames having guiding surfaces formed therein for receiving the chocks of said vertical rolls and allowing them to move towards and away from each other in a horizontal direction.

7. A rolling mill according to claim 6, including means carried by said frames engaging each tension strap member of said vertical rolls, and means for adjusting said engaging means for said vertical rolls for adjusting said vertical rolls relative to each other, means disposed in said chocks of said vertical rolls and having portions optionally engageable and disengageable with said tension strap members of said vertical rolls, and means for effecting said engagement and disengagement of said means disposed in said chocks of said vertical rolls.

8. A rolling mill according to claim 7, including eccentrics mounted in said strap members for adjusting said strap members of said vertical rolls and, hence, effecting additional adjustment of said vertical rolls, said engaging means of said vertical rolls including other eccentrics adapted to carry said strap members, and common drive means for rotating said other eccentrics.