CA2055184A1 - Rolling mill stand - Google Patents
Rolling mill standInfo
- Publication number
- CA2055184A1 CA2055184A1 CA 2055184 CA2055184A CA2055184A1 CA 2055184 A1 CA2055184 A1 CA 2055184A1 CA 2055184 CA2055184 CA 2055184 CA 2055184 A CA2055184 A CA 2055184A CA 2055184 A1 CA2055184 A1 CA 2055184A1
- Authority
- CA
- Canada
- Prior art keywords
- rolls
- mill stand
- rolling mill
- rolling
- work roll
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
- B21B13/147—Cluster mills, e.g. Sendzimir mills, Rohn mills, i.e. each work roll being supported by two rolls only arranged symmetrically with respect to the plane passing through the working rolls
Abstract
ABSTRACT OF THE DISCLOSURE
A rolling mill stand with cambered work rolls and back-up rolls for the work rolls. Two back-up rolls are provided for the lower work roll. The back-up rolls are mounted so as to be swingable on a circular path about the center of the lower work roll in order to obtain a continuous adjustment of the support effect. As a result, it is simultaneously possible to continuously adjust the camber in the roll gap during the rolling procedure in dependence on the rolling force acting on the rolls.
A rolling mill stand with cambered work rolls and back-up rolls for the work rolls. Two back-up rolls are provided for the lower work roll. The back-up rolls are mounted so as to be swingable on a circular path about the center of the lower work roll in order to obtain a continuous adjustment of the support effect. As a result, it is simultaneously possible to continuously adjust the camber in the roll gap during the rolling procedure in dependence on the rolling force acting on the rolls.
Description
2~518~
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to a rolling mill stand for cold-rolling and hot-rolling of flat material, particularly for reducing and temper-rolling metal strip.
The rolling mill stand includes two cambered work rolls and back-up rolls for the work rolls.
2. Description of the Related Art In order to change the camber in the roll gap, it is known in the art, for example, to axially displace appropriately shaped work rolls. However, it is also known in the art to prebend the back-up rolls for the work rolls and to horizontally bend driven intermediate rolls. Also known is the adjustment of a shell-type roll by varying the hydraulic pressure between the roll shell and the roll body.
However, the known adjustments are usually cumbersome and expensive.
SUMMARY OF THE INVENTION
; Therefore, it is the object of the present invention to provide a rolling mill stand of the above-described type in 20~18~
which the camber in the roll gap can be continuously adjusted during the rolling process in a simple and quick manner.
In accordance with the present invention, the above object is met in a rolling mill stand of the above-described type by providing two back-up rolls each for the lower work roll and/or for the upper work roll. For the continuous adjustment of the back-up aGtion, the back-up rolls are mounted so as to be swingable. Preferably, the back-up rolls are mounted so as to be swingable on a circular path around the center of the lower work roll or the upper work roll, respectively.
The features of the present invention make it possible that bending and, thus, cambering of the lower work roll and/or upper work roll can be continuously adjusted in dependence on the respective rolling force by a swinging movement of the respective back-up rolls, so that always a uniform roll gap is realized. The camber of the work rolls is provided in accordance with 100% of the maximum rolling force, so that when the rolling force is reduced the bending of the lower work roll and/or upper work roll can be adjusted in such a way that the sum of the bending deformations at the upper and lower work rolls corresponds to the sum of the cambers which have been utilized.
2Q~18~
Two back-up rolls are preferably provided only for the lower work roll. In this case, the upper work roll is supported in the known manner by only a single back-up roll and is equipped with an adjusting system. If it is assumed that the upper back-up roll and the two lower back-up rolls have the same diameter and the two lower back-up rolls are arranged at an initial angle of 45~ relative to the center of the lower work roll, the diameter ratio of back-up rolls to work rolls is approximately 2.4. In this assumed initial position of 45, the two lower back-up rolls have the same supporting effect as the single upper back-up roll. By swinging the two lower back-up rolls apart, an increased spreading effect is obtained which, however, permits an increased bending of the lower work roll in order always to provide a correction of the bending line and, consequently, cambering of the roll to obtain an ideal roll gap.
In the event that larger back-up rolls are required, for example, when a larger control range is necessary, the present invention provides that at least one intermediate roll is provided between outer back-up rolls and the lower work roll and/or the upper work roll, wherein at least two back-up rolls are mounted so as to be swingable on a circular path around the center of the intermediate roll for these back-up rolls in order to obtain a continuous adjustment of the back-up effect. It is essentially also possible to `` 20~518~
vertically adjust the entire rolling mill stand for adjusting the pass line.
In accordance with a preferred embodiment of the invention, the back-up rolls are mounted with segment-like bearing blocks on rolling bodies which, in turn, are mounted on semi-cylindrical bearing shells. It is also possible to mount the back-up rolls in sliding or hydrostatic bearing shells. The described features make it possible to easily swing the back-up rolls. This is particularly true if adjusting drives, for example, hydraulically or pneumatically operated cylinder-piston arrangements or mechanically actuated spindles, are hinged to the housings of the rolling mill stand.
The present invention further provides that the back-up rolls and possibly the intermediate rolls and the adjusting drives are arranged symmetrically relative to a vertical axis of symmetry extending through the work rolls. As a result, the back-up rolls can be swung by means of the adjusting drive either individually or together through an equal or unequal angle. This makes possible a continuous adjustment of the camber for each rolling procedure, even if the rolled material is not to be reduced but is only to be temper-rolled.
205~
The present invention also relates to a method for changing the ca~ber of a work roll supported by means of two back-up rolls in the roll gap during the rolling procedure in dependence on the respective rolling force. The method includes continuously changing the back-up effect by swinging the two swingably mounted back-up rolls by an angle which is predetermined by the respective rolling force, so that the sum of the bending of the upper work roll and the lower work roll corresponds to the sum of the non-utilized cambers.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWING
In the drawing:
Fig. 1 is a schematic side view of the rolling mill stand according to the present invention;
20~518~
Fig. 2 is a front elevational view of the rolling mill stand of Fig. l;
Fig. 3 is a schematic illustration of the arrangement of the work rolls and back-up rolls of the rolling mill stand of Fig. l;
Fig. 4 is a schematic illustration of another embodiment with two back-up rolls for the lower work roll and the upper work roll;
Fig. 5 is a schematic illustration of another embodiment with an intermediate roll;
Fig. 6 is a schematic illustration of the rolls of Fig.
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to a rolling mill stand for cold-rolling and hot-rolling of flat material, particularly for reducing and temper-rolling metal strip.
The rolling mill stand includes two cambered work rolls and back-up rolls for the work rolls.
2. Description of the Related Art In order to change the camber in the roll gap, it is known in the art, for example, to axially displace appropriately shaped work rolls. However, it is also known in the art to prebend the back-up rolls for the work rolls and to horizontally bend driven intermediate rolls. Also known is the adjustment of a shell-type roll by varying the hydraulic pressure between the roll shell and the roll body.
However, the known adjustments are usually cumbersome and expensive.
SUMMARY OF THE INVENTION
; Therefore, it is the object of the present invention to provide a rolling mill stand of the above-described type in 20~18~
which the camber in the roll gap can be continuously adjusted during the rolling process in a simple and quick manner.
In accordance with the present invention, the above object is met in a rolling mill stand of the above-described type by providing two back-up rolls each for the lower work roll and/or for the upper work roll. For the continuous adjustment of the back-up aGtion, the back-up rolls are mounted so as to be swingable. Preferably, the back-up rolls are mounted so as to be swingable on a circular path around the center of the lower work roll or the upper work roll, respectively.
The features of the present invention make it possible that bending and, thus, cambering of the lower work roll and/or upper work roll can be continuously adjusted in dependence on the respective rolling force by a swinging movement of the respective back-up rolls, so that always a uniform roll gap is realized. The camber of the work rolls is provided in accordance with 100% of the maximum rolling force, so that when the rolling force is reduced the bending of the lower work roll and/or upper work roll can be adjusted in such a way that the sum of the bending deformations at the upper and lower work rolls corresponds to the sum of the cambers which have been utilized.
2Q~18~
Two back-up rolls are preferably provided only for the lower work roll. In this case, the upper work roll is supported in the known manner by only a single back-up roll and is equipped with an adjusting system. If it is assumed that the upper back-up roll and the two lower back-up rolls have the same diameter and the two lower back-up rolls are arranged at an initial angle of 45~ relative to the center of the lower work roll, the diameter ratio of back-up rolls to work rolls is approximately 2.4. In this assumed initial position of 45, the two lower back-up rolls have the same supporting effect as the single upper back-up roll. By swinging the two lower back-up rolls apart, an increased spreading effect is obtained which, however, permits an increased bending of the lower work roll in order always to provide a correction of the bending line and, consequently, cambering of the roll to obtain an ideal roll gap.
In the event that larger back-up rolls are required, for example, when a larger control range is necessary, the present invention provides that at least one intermediate roll is provided between outer back-up rolls and the lower work roll and/or the upper work roll, wherein at least two back-up rolls are mounted so as to be swingable on a circular path around the center of the intermediate roll for these back-up rolls in order to obtain a continuous adjustment of the back-up effect. It is essentially also possible to `` 20~518~
vertically adjust the entire rolling mill stand for adjusting the pass line.
In accordance with a preferred embodiment of the invention, the back-up rolls are mounted with segment-like bearing blocks on rolling bodies which, in turn, are mounted on semi-cylindrical bearing shells. It is also possible to mount the back-up rolls in sliding or hydrostatic bearing shells. The described features make it possible to easily swing the back-up rolls. This is particularly true if adjusting drives, for example, hydraulically or pneumatically operated cylinder-piston arrangements or mechanically actuated spindles, are hinged to the housings of the rolling mill stand.
The present invention further provides that the back-up rolls and possibly the intermediate rolls and the adjusting drives are arranged symmetrically relative to a vertical axis of symmetry extending through the work rolls. As a result, the back-up rolls can be swung by means of the adjusting drive either individually or together through an equal or unequal angle. This makes possible a continuous adjustment of the camber for each rolling procedure, even if the rolled material is not to be reduced but is only to be temper-rolled.
205~
The present invention also relates to a method for changing the ca~ber of a work roll supported by means of two back-up rolls in the roll gap during the rolling procedure in dependence on the respective rolling force. The method includes continuously changing the back-up effect by swinging the two swingably mounted back-up rolls by an angle which is predetermined by the respective rolling force, so that the sum of the bending of the upper work roll and the lower work roll corresponds to the sum of the non-utilized cambers.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWING
In the drawing:
Fig. 1 is a schematic side view of the rolling mill stand according to the present invention;
20~518~
Fig. 2 is a front elevational view of the rolling mill stand of Fig. l;
Fig. 3 is a schematic illustration of the arrangement of the work rolls and back-up rolls of the rolling mill stand of Fig. l;
Fig. 4 is a schematic illustration of another embodiment with two back-up rolls for the lower work roll and the upper work roll;
Fig. 5 is a schematic illustration of another embodiment with an intermediate roll;
Fig. 6 is a schematic illustration of the rolls of Fig.
3 with the lower back-up rolls being swung by 60;
Fig. 7 shows the elastic bending of the rolls in a position swung by 45;
Fig. 8 shows the elastic bending of the rolls in a position swung by 60; and Fig. 9 shows the arrangement of rolls according to the present invention in a multiple-roll rolling mill stand.
2~5i8~
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The figures of the drawing show a rolling mill stand 1 for cold-rolling and hot-rolling of flat material, particularly for reducing and temper-rolling of metal strip.
The rolling mill stand 1 is essentially composed of two cambered work rolls 2a, 2b and back-up rolls 3, 4 for the work rolls.
As shown in Fig. 3, two back-up rolls 4a, 4b are provided for the lower work roll 2b. However, as shown in Fig. 4, it is also possible to provide two back-up rolls 3a, 3b additionally for the upper work roll.
The two back-up rolls 3a, 3b or 4a, 4b are mounted so as to be swingable on a circular path B about the center M of the lower or upper work roll 2a, 2b for the continuous adjustment of the support effect.
As shown in Fig. 5, the back-up rolls 4a, 4b are supported in segment-like bearing blocks 5. The segment-like bearing blocks 5 are mounted so as to be swingable in a semi-cylindrical bearing shell 7 on rolling bodies 6. Adjusting drives 8 are hinged to the bearing blocks 5 and to the housings of the rolling mill stand 1. In the illustrated embodiment, the adjusting drives 8 are hydraulically operated cylinder-piston arrangements.
; 8 20~18~
In accordance with another embodiment illustrated in Fig. 5 of the drawing, an intermediate roll 9 is mounted between the lower work roll 2b and the two back-up rolls 4a, 4b. In this case, the back-up rolls 4a, 4b are mounted so as to be swingable along a circular path B1 about the center M
of the intermediate roll 9 in order to obtain a continuous adjustment of the support effect.
The back-up rolls 3a, 3b or 4a, 4b and, if provided, the intermediate roll 9 as well as the adjusting drives 8 are arranged symmetrically relative to a vertical axis of symmetry S extending through the work rolls 2a, 2b. The back-up rolls 3a, 3b or 4a, 4b can be swung by means of the adjusting drives 8 individually or together through an equal or unequal angle ~. Swinging of the two lower back-up rolls 4a, 4b (and of the two upper back-up rolls, if provided) always results in a eontinuous adjustment of the eamber of the work rolls 2a, 2b in the roll gap during the rolling proeedure in a simple and quiek manner.
Figs. 7 and 8 of the drawing show the elastie bending behavior of the rolls at swung positions of 45 and 60, respectively. For clarity's sake, the work rolls 2a, 2b which are actually cambered and the back-up rolls 3, 4a, 4b are shown cylindrically and the illustration of the elastie g 20~518~
bending is exaggerated. As can be seen, the elastic bending 11 is greater in the 60 position than the bending 10 in the 45 position.
When appropriately taking into consideration the roll diameters, the teaching of the present invention can also be utilized in multiple-roll rolling mill stands. For example, the 20-roll rolling mill stand shown in Fig. 9 has eight back-up rolls 3, 4 of which always two lower and two upper back-up rolls 4a, 4b and 3a, 3b are mounted so as to be swingable about the center M1 of the respective intermediate roll 9 in order to obtain a continuous adjustment of the support effect.
In addition, it is possible to deviate from the ideal circular path about the center of the contacting roll when the back-up rolls are swung if the resulting error in the spacing between the work rolls is compensated by means of the roll adjusting system. In this manner, instead of using shims, the wear or abrasion of the rolls can be compensated.
The drive of the rolling mill stand can be provided in the conventional manner on the work rolls or the back-up rolls.
Also, the rolling action can be aided by appropriate tensioning units in front of and behin~ the rolling gap.
20~1 8~
While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.
Fig. 7 shows the elastic bending of the rolls in a position swung by 45;
Fig. 8 shows the elastic bending of the rolls in a position swung by 60; and Fig. 9 shows the arrangement of rolls according to the present invention in a multiple-roll rolling mill stand.
2~5i8~
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The figures of the drawing show a rolling mill stand 1 for cold-rolling and hot-rolling of flat material, particularly for reducing and temper-rolling of metal strip.
The rolling mill stand 1 is essentially composed of two cambered work rolls 2a, 2b and back-up rolls 3, 4 for the work rolls.
As shown in Fig. 3, two back-up rolls 4a, 4b are provided for the lower work roll 2b. However, as shown in Fig. 4, it is also possible to provide two back-up rolls 3a, 3b additionally for the upper work roll.
The two back-up rolls 3a, 3b or 4a, 4b are mounted so as to be swingable on a circular path B about the center M of the lower or upper work roll 2a, 2b for the continuous adjustment of the support effect.
As shown in Fig. 5, the back-up rolls 4a, 4b are supported in segment-like bearing blocks 5. The segment-like bearing blocks 5 are mounted so as to be swingable in a semi-cylindrical bearing shell 7 on rolling bodies 6. Adjusting drives 8 are hinged to the bearing blocks 5 and to the housings of the rolling mill stand 1. In the illustrated embodiment, the adjusting drives 8 are hydraulically operated cylinder-piston arrangements.
; 8 20~18~
In accordance with another embodiment illustrated in Fig. 5 of the drawing, an intermediate roll 9 is mounted between the lower work roll 2b and the two back-up rolls 4a, 4b. In this case, the back-up rolls 4a, 4b are mounted so as to be swingable along a circular path B1 about the center M
of the intermediate roll 9 in order to obtain a continuous adjustment of the support effect.
The back-up rolls 3a, 3b or 4a, 4b and, if provided, the intermediate roll 9 as well as the adjusting drives 8 are arranged symmetrically relative to a vertical axis of symmetry S extending through the work rolls 2a, 2b. The back-up rolls 3a, 3b or 4a, 4b can be swung by means of the adjusting drives 8 individually or together through an equal or unequal angle ~. Swinging of the two lower back-up rolls 4a, 4b (and of the two upper back-up rolls, if provided) always results in a eontinuous adjustment of the eamber of the work rolls 2a, 2b in the roll gap during the rolling proeedure in a simple and quiek manner.
Figs. 7 and 8 of the drawing show the elastie bending behavior of the rolls at swung positions of 45 and 60, respectively. For clarity's sake, the work rolls 2a, 2b which are actually cambered and the back-up rolls 3, 4a, 4b are shown cylindrically and the illustration of the elastie g 20~518~
bending is exaggerated. As can be seen, the elastic bending 11 is greater in the 60 position than the bending 10 in the 45 position.
When appropriately taking into consideration the roll diameters, the teaching of the present invention can also be utilized in multiple-roll rolling mill stands. For example, the 20-roll rolling mill stand shown in Fig. 9 has eight back-up rolls 3, 4 of which always two lower and two upper back-up rolls 4a, 4b and 3a, 3b are mounted so as to be swingable about the center M1 of the respective intermediate roll 9 in order to obtain a continuous adjustment of the support effect.
In addition, it is possible to deviate from the ideal circular path about the center of the contacting roll when the back-up rolls are swung if the resulting error in the spacing between the work rolls is compensated by means of the roll adjusting system. In this manner, instead of using shims, the wear or abrasion of the rolls can be compensated.
The drive of the rolling mill stand can be provided in the conventional manner on the work rolls or the back-up rolls.
Also, the rolling action can be aided by appropriate tensioning units in front of and behin~ the rolling gap.
20~1 8~
While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.
Claims (11)
1. In a rolling mill stand for cold-rolling and hot-rolling of flat material, particularly for reducing and temper-rolling metal strip, the rolling mill stand including a cambered lower work roll and a cambered upper work roll and back-up rolls for the work rolls, the improvement comprising two back-up rolls provided at least for the lower work roll, and means for swinging the back-up rolls for continuously adjusting the support effect of the back-up rolls.
2. The rolling mill stand according to claim 1, wherein the back-up rolls are mounted so as to be swingable on a circular path around the center of the work roll.
3. The rolling mill stand according to claim 1, comprising an intermediate roll mounted at least between the lower work roll and the back-up rolls of the lower work roll, wherein the back-up rolls are mounted so as to be swingable on a circular path around the center of the intermediate roll for continuously adjusting the support effect of the back-up rolls.
4. The rolling mill stand according to claims 2 or 3, comprising a semi-cylindrical bearing shell, wherein the support rolls are mounted with segment-like bearing blocks on rolling bodies in the semi-cylindrical bearing shell.
5. The rolling mill stand according to claims 2 or 3, comprising a sliding or hydrostatic bearing shell, the support rolls being mounted with segment-type bearing blocks on the bearing shell.
6. The rolling mill stand according to claim 4, comprising adjusting drives hinged to the bearing blocks and to housings of the rolling mill stand.
7. The rolling mill stand according to claim 6, wherein the adjusting drives are hydraulically or pneumatically operated cylinder-piston arrangements.
8. The rolling mill stand according to claim 6, wherein the adjusting drives are mechanically operated spindles.
9. The rolling mill stand according to claim 6, wherein the support rolls and the adjusting drives are arranged symmetrically relative to a vertical axis of symmetry extending through the work rolls.
10. The rolling mill stand according to claim 6, wherein the back-up rolls are swingable by means of the adjusting drives individually or together through an equal or unequal angle.
11. Method of adjusting the camber of at least a lower work roll of a rolling mill stand including an upper work roll and the lower work roll, the adjustment being effected by means of two back-up rolls in a rolling gap during a rolling procedure in dependence on a rolling force, the back-up rolls being mounted so as to be swingable, the method comprising continuously adjusting the support effect provided by the back-up rolls by swinging the two back-up rolls through a predetermined angle, such that the sum of bendings of the upper and lower work roll corresponds to the sum of the non-utilized cambers.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19900121457 EP0484584B1 (en) | 1990-11-09 | 1990-11-09 | Rolling stand |
| EP90121457.7 | 1990-11-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2055184A1 true CA2055184A1 (en) | 1992-05-10 |
Family
ID=8204698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2055184 Abandoned CA2055184A1 (en) | 1990-11-09 | 1991-11-08 | Rolling mill stand |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0484584B1 (en) |
| CA (1) | CA2055184A1 (en) |
| DE (1) | DE59003031D1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE566683C (en) * | 1929-01-29 | 1934-10-31 | Heraeus Vacuumschmelze A G | Rolling mill with support and work rolls |
| GB523777A (en) * | 1938-12-14 | 1940-07-23 | Robert Bass | Rolling-mills |
| US2566679A (en) * | 1943-02-25 | 1951-09-04 | Armzen Company | Rolling mill and lubrication method and means therefor |
| CH422686A (en) * | 1963-02-28 | 1966-10-31 | Lee Wilson Engineering S A | Rolling mill for the treatment of metal strips and processes for operating the rolling mill |
| FR2257360A1 (en) * | 1974-01-14 | 1975-08-08 | Inst Chernoi Metallurgii | Rolling mill using rotating ring frames - to give rigid structure and reduce radial stress on bearings |
| FI64902C (en) * | 1976-03-30 | 1984-02-10 | Wiik & Hoeglund | COMPENSATION FOR COMPENSATION OF VALUES AND ENVIRONMENT |
| SU1514435A1 (en) * | 1988-01-28 | 1989-10-15 | Dn Metall Inst | Multiroll working stand |
-
1990
- 1990-11-09 EP EP19900121457 patent/EP0484584B1/en not_active Expired - Lifetime
- 1990-11-09 DE DE90121457T patent/DE59003031D1/en not_active Expired - Fee Related
-
1991
- 1991-11-08 CA CA 2055184 patent/CA2055184A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE59003031D1 (en) | 1993-11-11 |
| EP0484584A1 (en) | 1992-05-13 |
| EP0484584B1 (en) | 1993-10-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |