CA1230508A - Base structure for supporting a gear box, particularly for the rolls of a crossed-stand type rolling mill - Google Patents
Base structure for supporting a gear box, particularly for the rolls of a crossed-stand type rolling millInfo
- Publication number
- CA1230508A CA1230508A CA000431525A CA431525A CA1230508A CA 1230508 A CA1230508 A CA 1230508A CA 000431525 A CA000431525 A CA 000431525A CA 431525 A CA431525 A CA 431525A CA 1230508 A CA1230508 A CA 1230508A
- Authority
- CA
- Canada
- Prior art keywords
- gear box
- casing
- horizontal
- base structure
- gear
- 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.)
- Expired
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 19
- 230000008093 supporting effect Effects 0.000 title claims description 4
- 238000012423 maintenance Methods 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 235000003332 Ilex aquifolium Nutrition 0.000 description 1
- 235000002296 Ilex sandwicensis Nutrition 0.000 description 1
- 235000002294 Ilex volkensiana Nutrition 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
- B21B35/12—Toothed-wheel gearings specially adapted for metal-rolling mills; Housings or mountings therefor
-
- 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
- B21B13/08—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process
- B21B13/12—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process axes being arranged in different planes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Gear Transmission (AREA)
- Friction Gearing (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a crossed-stand type rolling mill, the gearboxes included in the drive transmission to the working rolls of the mill are inclined at an angle of 45° to the horizontal. In order to facilitate the maintenance and repair of such gear boxes, a gear-box base structure is provided which enables the gear box to be swung up out of its inclined position into a more convenient horizontal position. The gear box is supported in this latter position by a strut which can be pivoted into a stowed position when not required.
In a crossed-stand type rolling mill, the gearboxes included in the drive transmission to the working rolls of the mill are inclined at an angle of 45° to the horizontal. In order to facilitate the maintenance and repair of such gear boxes, a gear-box base structure is provided which enables the gear box to be swung up out of its inclined position into a more convenient horizontal position. The gear box is supported in this latter position by a strut which can be pivoted into a stowed position when not required.
Description
~3~:~S~3~
..
This invention relates to a base s~ructure for supporting a gear box, in particular for the rolls of a crossed-stand type rolling mill ~or ex~mple, for the p~oduction o~ seamless tubes.
More particularly, the present invention relates to a base structure in ~Yhich two abutment ~alls constitute a receiving and suppor-ting seat for a gear box, the walls being perpendicular to each other, inclined at ~5 to the vertical, and converging downwardly.
In a rolling mill of the a~oresaid type, the rolling stands are oppositely inclined a~ 45 to the horizontal rolling axis, the axes of the rolls of each stand also being inclined at 45.
As is known, ~he rolls of each stand are rotated by the same motor through a single gear box to which they are kinematically connected through respective extension shafts. Due to the inclined position of the stands and of the rolls, the extension shafts and the axes of the gears and wheels of the gear box are also inclined at ~5 to the vertical.
As is also well known, a gear box of the type under consideration has considerable dimensions and a weight of the order of 100 tons, and is generally fixed to an associated support base of appropriate structure and dimensions. The most distinctive part of such a base is constituted by a pair of mutually-perpendicular abutment walls which are inclined at 45 to the vertical, converge downwardly and constitute the receiving seat for the gear box. Generally, in a crossed-stand type rolling mill the gear boxes are supported at a level of 5 to 7 metres or more beneath the factory floor.
Even for gear boxes, as for all cornponents of a rolllng mill, there are periodic planned maintenance and checking operations with possible replacement of parts and components which are worn or not entirely reliable.
~.~
One method of carrying out sucil operations involvcs a progressive opening of the casing of the gear box with related dlsmantling operations and removal o$ the gears of the gear box which are accessible from the cxterior.
The same operations, but reversed in sequence, are then carried out to re-assemble the components of the gear box. Since these components, taken individually, are not generally more than 20 tons in weight, the said method may be carried out by using the same crane used for lifting and replacing the components of the rolling s~ands, these components as is well known having a weight of from 25 to 30 tons. However as well as this known advantage there is the inconvenience resulting from the considerable handling difficulty caused by the weight of the individual components of the gear box and of the need to position them inclined to the vertical. Indeed, the dismantling and reassembly of these components involves a whole series of highly exacting manoeuvres which involve a considerable amount of time as well as a high risk of the various components of the gear box knocking against each other with the possibility of deformation or even breakage thereof.
In order to overcome these disadvantages and in accordance with another method, the entire gear box is raised to the level of the factory floor where it is positioned with its axes horizontal. After the opening of the casing of the gear box, the removal and/or replacement of the components may be carried out more easily. Although advantageous from the point of view of speed and facility of execution, this method requires the use of a 100 ton crane, a crane which, in rolling mills, is used solely for raising the gear boxes when the said maintenance and check operations are required and which, notwith-standing the long periods during which this crane is not required, necessitate the housing of the rolling mill in a suitablc shed of very large dimensions.
.~3~3~0~
The main ob~ect of this invention is to overcome the disadvantages mentioned above with reference to the known art.
According to the presen-t invention there is provided a base structure for supportiny a gear box in an inclined position, said gear box being oE the type inclucling a casing and components removably mounted therein, said base structure being arranged to support the gear box in an inclined position and enabling the gear box to be rotated out of this position for maintenance or repair; said base structure comprising: two abutment walls angled relative to each other and converging downwardly, said walls serving to support the gear box casing in its said lnclined position, a pivot structure supported close to the uppermost edge of one of the said abutment walls, said pivot structure defining a horizontal pivot axis and being rotatably engageable by the gear box casing along a corner edge thereof whereby to enable the gear box to be swung up out of its inclined position by rotation about said pivot axis, a horizontal pivot supported close to the lowermost edge of the other said abutment wall, and a strut having one end rotatably mounted on said horizontal pivot, the other end of the strut being intended to engage the underside of the gear box casing after the latter has been swung out of its inclined position whereby to support the casing in a position facilitating its maintenance or repair.
According to another feature the present invention proviaes a crossed~s-tand rolling mill having rolls inclined at to the horizontal, and drive means for rotatabl~ driving said rolls, said drive means including gear boxes of the type -3 ~
a comprising a casing and components remov~bl~ mowlted the~ein, each said gear box being supported by a base structure according to Claim 1, to enable the gear box to be moved from an inclined operating position, to a horizontal position facilitating maintenance and repair, by pivoting of the gear bo~ casing about said horizontal axis defined by the said pivot structure.
Further characteristics and advantages will be better understood from the description given below of one embodiment of a gear box base structure according to the invention, reference being made to the appended drawings, given purely by way of non-limiting example, in which:
Figure 1 is a schematic view of a cross-stand rolling mill in which the gear boxes are supported by respective bases according to the invention;
Figure 2 is a side view on an enlarged scale of a base structure according to the invention;
Figure 3 is a plan view of a detail of Figure l;
Figure 4 shows to an enlarged scale, a detail of the base of the preceding Figures.
With reference to Figure 1, two stands of a crossed-stand type rolling mill are indicated schematically by 1 or 2, the stands, as known, being oppositely inclined at 45 to the horizontal rolling axis indicated A.
~ -3a-3~3~3~
Each stand operatively supports ~wo roll5 3, ~ al50 incl:ined at 45 to the axis A, which are driven by a motor 5 through a singl~ gear box 6 to which the rolls 3, 4 are kin~matically connected ~hrough extension shafts 7, 8.
This gear box 6, the casing of which is specific~lly indicated 9, is fixed to a support base 10 having two bearing wa]ls respectively indicated 11 and 12 these walls being perpendicular to each other and converging down~ardly. ~le wall 12 extends parallel to the axis of the rolls 3, 4 of the corresponding stand 1.
The walls ll and 12 are generally constituted by plates fixed in the desired angled positions on respective supports 13, 14 generally of a s~bstantial metal structure.
Close to its uppermost edge the support 14 carries, on respective lugs 15, 16, horizontal, coaxial pivots 17, 18 which extend parallel to the rolling axis A. The casing 9 of the gear box 6 is pivoted along a corner edge on these pivots 17, 18. Purely by way o~ example, the pivoting is preferably achieved by means of a pair of saddles 19, 20 which are fixed to the wall of the casing 9 facing towards the corresponding rolling stand 1 and are rotatably mounted on the said pivots.
By 21 is generally indicated a strut having one end rotatably mounted on a horizontal pin 22 parallel to the rolling axis A and carried by the support 13 by l~holly conventional means schematically shown at 23. The strut 21 is preferably constituted by a pair of parallel arms 21a, 21b the free ends of which support an idler roller 2~. By means of this roller 24 the s~rut 21 is intended to releasably engage a hook yrojection 25 formed or otherwise fixed to a central portion of the casing 9 of the gear box, close to the lower co-rner thereof opposite that pivoted on the pivots 17, 18, mentioned above.
~3~
A further hook projection 26 is formed or otherwise fixed to the casing 9 in a position thereon which lies as far as possible from the axis of the pivots 17, 18 when the gear box 6 is in its operative posi~ion fixed to the bearing walls 11, 12.
Purthermore, the hook portion ~6 is in a position accessible from above since it is intended to be engaged by a crane the lifting hook of which is shown schematically at 27 in the drawings.
~ hen it is necessary to carry out an operation on the gear box 6, for example to remove and/or replace components of the gear box, one proceeds in the following manner.
After releasing the casing 9 from the bearing walls 11, 12, uncoupling the gear box 6 from the motor 5 and from the extension shafts 7, 8, the hook 27 of the lifting crane is engaged with the hook projection 26 of the casing. Thereafter, the entire gear box is displaced angularly about the axis of the pivots 17, 18 until it takes up a position in which the axes of its gears and other similar components are horizontal. Once this position has been reached, the strut 21 is operated ~either manually or by means of conventional motors) to engage the idler roller 24 thereof in the hook projection 25 of the casing 9. ~ith the gear box 6 firmly held in position with its axes hori~ontal, the operations of removing and replacing components of the gear box itself may now be carried out rapidly and easily.
Added to this indisputable technical advantage is that constituted by the fact that the displacement of the gear box about the axis of the pivots 17 and 18 may be carried out by using the same crane as that already used for the replacement and displacement of the actual rolling components.
~3~
Obviously all the reverse opera-tions for re-positioning the gear box in the seat formed by the support base of the invention may also be carried out very rapidly and saf~ly.
..
This invention relates to a base s~ructure for supporting a gear box, in particular for the rolls of a crossed-stand type rolling mill ~or ex~mple, for the p~oduction o~ seamless tubes.
More particularly, the present invention relates to a base structure in ~Yhich two abutment ~alls constitute a receiving and suppor-ting seat for a gear box, the walls being perpendicular to each other, inclined at ~5 to the vertical, and converging downwardly.
In a rolling mill of the a~oresaid type, the rolling stands are oppositely inclined a~ 45 to the horizontal rolling axis, the axes of the rolls of each stand also being inclined at 45.
As is known, ~he rolls of each stand are rotated by the same motor through a single gear box to which they are kinematically connected through respective extension shafts. Due to the inclined position of the stands and of the rolls, the extension shafts and the axes of the gears and wheels of the gear box are also inclined at ~5 to the vertical.
As is also well known, a gear box of the type under consideration has considerable dimensions and a weight of the order of 100 tons, and is generally fixed to an associated support base of appropriate structure and dimensions. The most distinctive part of such a base is constituted by a pair of mutually-perpendicular abutment walls which are inclined at 45 to the vertical, converge downwardly and constitute the receiving seat for the gear box. Generally, in a crossed-stand type rolling mill the gear boxes are supported at a level of 5 to 7 metres or more beneath the factory floor.
Even for gear boxes, as for all cornponents of a rolllng mill, there are periodic planned maintenance and checking operations with possible replacement of parts and components which are worn or not entirely reliable.
~.~
One method of carrying out sucil operations involvcs a progressive opening of the casing of the gear box with related dlsmantling operations and removal o$ the gears of the gear box which are accessible from the cxterior.
The same operations, but reversed in sequence, are then carried out to re-assemble the components of the gear box. Since these components, taken individually, are not generally more than 20 tons in weight, the said method may be carried out by using the same crane used for lifting and replacing the components of the rolling s~ands, these components as is well known having a weight of from 25 to 30 tons. However as well as this known advantage there is the inconvenience resulting from the considerable handling difficulty caused by the weight of the individual components of the gear box and of the need to position them inclined to the vertical. Indeed, the dismantling and reassembly of these components involves a whole series of highly exacting manoeuvres which involve a considerable amount of time as well as a high risk of the various components of the gear box knocking against each other with the possibility of deformation or even breakage thereof.
In order to overcome these disadvantages and in accordance with another method, the entire gear box is raised to the level of the factory floor where it is positioned with its axes horizontal. After the opening of the casing of the gear box, the removal and/or replacement of the components may be carried out more easily. Although advantageous from the point of view of speed and facility of execution, this method requires the use of a 100 ton crane, a crane which, in rolling mills, is used solely for raising the gear boxes when the said maintenance and check operations are required and which, notwith-standing the long periods during which this crane is not required, necessitate the housing of the rolling mill in a suitablc shed of very large dimensions.
.~3~3~0~
The main ob~ect of this invention is to overcome the disadvantages mentioned above with reference to the known art.
According to the presen-t invention there is provided a base structure for supportiny a gear box in an inclined position, said gear box being oE the type inclucling a casing and components removably mounted therein, said base structure being arranged to support the gear box in an inclined position and enabling the gear box to be rotated out of this position for maintenance or repair; said base structure comprising: two abutment walls angled relative to each other and converging downwardly, said walls serving to support the gear box casing in its said lnclined position, a pivot structure supported close to the uppermost edge of one of the said abutment walls, said pivot structure defining a horizontal pivot axis and being rotatably engageable by the gear box casing along a corner edge thereof whereby to enable the gear box to be swung up out of its inclined position by rotation about said pivot axis, a horizontal pivot supported close to the lowermost edge of the other said abutment wall, and a strut having one end rotatably mounted on said horizontal pivot, the other end of the strut being intended to engage the underside of the gear box casing after the latter has been swung out of its inclined position whereby to support the casing in a position facilitating its maintenance or repair.
According to another feature the present invention proviaes a crossed~s-tand rolling mill having rolls inclined at to the horizontal, and drive means for rotatabl~ driving said rolls, said drive means including gear boxes of the type -3 ~
a comprising a casing and components remov~bl~ mowlted the~ein, each said gear box being supported by a base structure according to Claim 1, to enable the gear box to be moved from an inclined operating position, to a horizontal position facilitating maintenance and repair, by pivoting of the gear bo~ casing about said horizontal axis defined by the said pivot structure.
Further characteristics and advantages will be better understood from the description given below of one embodiment of a gear box base structure according to the invention, reference being made to the appended drawings, given purely by way of non-limiting example, in which:
Figure 1 is a schematic view of a cross-stand rolling mill in which the gear boxes are supported by respective bases according to the invention;
Figure 2 is a side view on an enlarged scale of a base structure according to the invention;
Figure 3 is a plan view of a detail of Figure l;
Figure 4 shows to an enlarged scale, a detail of the base of the preceding Figures.
With reference to Figure 1, two stands of a crossed-stand type rolling mill are indicated schematically by 1 or 2, the stands, as known, being oppositely inclined at 45 to the horizontal rolling axis indicated A.
~ -3a-3~3~3~
Each stand operatively supports ~wo roll5 3, ~ al50 incl:ined at 45 to the axis A, which are driven by a motor 5 through a singl~ gear box 6 to which the rolls 3, 4 are kin~matically connected ~hrough extension shafts 7, 8.
This gear box 6, the casing of which is specific~lly indicated 9, is fixed to a support base 10 having two bearing wa]ls respectively indicated 11 and 12 these walls being perpendicular to each other and converging down~ardly. ~le wall 12 extends parallel to the axis of the rolls 3, 4 of the corresponding stand 1.
The walls ll and 12 are generally constituted by plates fixed in the desired angled positions on respective supports 13, 14 generally of a s~bstantial metal structure.
Close to its uppermost edge the support 14 carries, on respective lugs 15, 16, horizontal, coaxial pivots 17, 18 which extend parallel to the rolling axis A. The casing 9 of the gear box 6 is pivoted along a corner edge on these pivots 17, 18. Purely by way o~ example, the pivoting is preferably achieved by means of a pair of saddles 19, 20 which are fixed to the wall of the casing 9 facing towards the corresponding rolling stand 1 and are rotatably mounted on the said pivots.
By 21 is generally indicated a strut having one end rotatably mounted on a horizontal pin 22 parallel to the rolling axis A and carried by the support 13 by l~holly conventional means schematically shown at 23. The strut 21 is preferably constituted by a pair of parallel arms 21a, 21b the free ends of which support an idler roller 2~. By means of this roller 24 the s~rut 21 is intended to releasably engage a hook yrojection 25 formed or otherwise fixed to a central portion of the casing 9 of the gear box, close to the lower co-rner thereof opposite that pivoted on the pivots 17, 18, mentioned above.
~3~
A further hook projection 26 is formed or otherwise fixed to the casing 9 in a position thereon which lies as far as possible from the axis of the pivots 17, 18 when the gear box 6 is in its operative posi~ion fixed to the bearing walls 11, 12.
Purthermore, the hook portion ~6 is in a position accessible from above since it is intended to be engaged by a crane the lifting hook of which is shown schematically at 27 in the drawings.
~ hen it is necessary to carry out an operation on the gear box 6, for example to remove and/or replace components of the gear box, one proceeds in the following manner.
After releasing the casing 9 from the bearing walls 11, 12, uncoupling the gear box 6 from the motor 5 and from the extension shafts 7, 8, the hook 27 of the lifting crane is engaged with the hook projection 26 of the casing. Thereafter, the entire gear box is displaced angularly about the axis of the pivots 17, 18 until it takes up a position in which the axes of its gears and other similar components are horizontal. Once this position has been reached, the strut 21 is operated ~either manually or by means of conventional motors) to engage the idler roller 24 thereof in the hook projection 25 of the casing 9. ~ith the gear box 6 firmly held in position with its axes hori~ontal, the operations of removing and replacing components of the gear box itself may now be carried out rapidly and easily.
Added to this indisputable technical advantage is that constituted by the fact that the displacement of the gear box about the axis of the pivots 17 and 18 may be carried out by using the same crane as that already used for the replacement and displacement of the actual rolling components.
~3~
Obviously all the reverse opera-tions for re-positioning the gear box in the seat formed by the support base of the invention may also be carried out very rapidly and saf~ly.
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A base structure for supporting a gear box in an inclined position, said gearbox being of the type including a casing and components removably mounted therein, said base structure being arranged to support the gear box in an inclined position and enabling the gearbox to be rotated out of this position for maintenance or repair, said base structure comprising:
two abutment walls angled relative to each other and converging downwardly, said walls serving to support the gearbox casing in its said inclined position, a pivot structure supported close to the uppermost edge of one of the said abutment walls, said pivot structure defining a horizontal pivot axis and being rotatably engageable by the gear box casing along a corner edge thereof whereby to enable the gearbox to be swung up out of its inclined position by rotation about said pivot axis, a horizontal pivot supported close to the lowermost edge of the other said abutment wall, and a strut having one end rotatably mounted on said horizontal pivot, the other end of the strut being intended to engage the underside of the gear-box casing after the latter has been swung out of its inclined position whereby to support the casing in a position facilitating its maintenance or repair.
two abutment walls angled relative to each other and converging downwardly, said walls serving to support the gearbox casing in its said inclined position, a pivot structure supported close to the uppermost edge of one of the said abutment walls, said pivot structure defining a horizontal pivot axis and being rotatably engageable by the gear box casing along a corner edge thereof whereby to enable the gearbox to be swung up out of its inclined position by rotation about said pivot axis, a horizontal pivot supported close to the lowermost edge of the other said abutment wall, and a strut having one end rotatably mounted on said horizontal pivot, the other end of the strut being intended to engage the underside of the gear-box casing after the latter has been swung out of its inclined position whereby to support the casing in a position facilitating its maintenance or repair.
2. A crossed-stand rolling mill having rolls inclined at 45° to the horizontal, and drive means for rotatably driving said rolls, said drive means including gear boxes of the type comprising a casing and components removably mounted therein, each said gear box being supported by a base structure according to Claim 1, to enable the gear box to be moved from an inclined operating position, to a horizontal position facilitating maintenance and repair, by pivoting of the gear box casing about said horizontal axis defined by the said pivot structure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT22293B/82 | 1982-06-30 | ||
| IT2229382U IT8222293V0 (en) | 1982-06-30 | 1982-06-30 | BASEMENT STRUCTURE FOR THE SUPPORT OF A SPEED REDUCER, IN PARTICULAR FOR ROLLING CYLINDERS OF ROLLING-CAGE ROLLING MACHINES. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1230508A true CA1230508A (en) | 1987-12-22 |
Family
ID=11194278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000431525A Expired CA1230508A (en) | 1982-06-30 | 1983-06-29 | Base structure for supporting a gear box, particularly for the rolls of a crossed-stand type rolling mill |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5920902U (en) |
| CA (1) | CA1230508A (en) |
| FR (1) | FR2529483A3 (en) |
| GB (1) | GB2122932B (en) |
| IT (1) | IT8222293V0 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422809A (en) * | 2015-12-19 | 2016-03-23 | 重庆麦拓科技有限公司 | Rolling mill and box thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1915545A1 (en) * | 1969-03-27 | 1970-12-23 | Calmes Dipl Ing Jean Paul | Rolling mill for reducing pipes |
-
1982
- 1982-06-30 IT IT2229382U patent/IT8222293V0/en unknown
-
1983
- 1983-06-23 GB GB08317105A patent/GB2122932B/en not_active Expired
- 1983-06-28 FR FR8310650A patent/FR2529483A3/en active Granted
- 1983-06-29 CA CA000431525A patent/CA1230508A/en not_active Expired
- 1983-06-30 JP JP10029283U patent/JPS5920902U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| GB8317105D0 (en) | 1983-07-27 |
| IT8222293V0 (en) | 1982-06-30 |
| FR2529483B3 (en) | 1984-06-01 |
| GB2122932B (en) | 1985-07-17 |
| GB2122932A (en) | 1984-01-25 |
| JPS5920902U (en) | 1984-02-08 |
| FR2529483A3 (en) | 1984-01-06 |
| JPH0216801Y2 (en) | 1990-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |