CN1220194A - Method and device for conveying wide specification section to rack cooling bed in rolling mill - Google Patents
Method and device for conveying wide specification section to rack cooling bed in rolling mill Download PDFInfo
- Publication number
- CN1220194A CN1220194A CN 98124208 CN98124208A CN1220194A CN 1220194 A CN1220194 A CN 1220194A CN 98124208 CN98124208 CN 98124208 CN 98124208 A CN98124208 A CN 98124208A CN 1220194 A CN1220194 A CN 1220194A
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- rack
- roller table
- rack system
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- 238000005096 rolling process Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000001816 cooling Methods 0.000 title claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 96
- 239000010959 steel Substances 0.000 claims description 96
- 230000003068 static effect Effects 0.000 claims description 22
- 238000007599 discharging Methods 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 abstract 1
- 238000003801 milling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 210000001364 upper extremity Anatomy 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
- B21B43/003—Transfer to bed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
- B21B43/02—Cooling beds comprising rakes racks, walking beams or bars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
- B21B43/006—Transfer from bed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a method and device for rolling mill, that is rolled profile segments are braked on an inclined entry roller conveyor leading to the rake system; dependent on its form and dimensions, it either slides off a specified tooth ground of the fixed rake or is positioned on this tooth ground. The device is transversely moved and possibly oriented by the rake system and straightened thereof as necessity; subsequently it is moved separately by a chain conveyor onto an exit roller conveyor. Several profile segments are conveyed together on the chain conveyor, and are presented to the conveyor as a layer of rolled profile segments.
Description
The present invention relates to a kind of will be still in rolling mill to pass to its form be the rack cooling bed and apparatus and method described section bar of lateral transport on this is rack cooling bed with rack system of static rack and carry-over bar in order to roll wide specification section bar heat and rolled piece that be cut into single steel.
Microscler steel part is normally produced in special rolling mill, and these milling trains itself are again to design for limited section bar kind.The transmission method of various cold beds and project organization are mainly determined by workpiece measurement and shape of rolling piece.Concerning section bar, finish to gauge length is corresponding to cold bed length.Also adopted the sawing machine of fixed-site as required, so that finish to gauge length is cut apart by cold bed length.
For a long time, the prior art known to the following basic model cold bed is such:
-as DD284421 and described rack cooling bed round steel, band steel and the little section bar of being specially adapted to of DE1233359;
-as the described step cooling bed of DE1427897 be preferably used in band steel, medium-sized section bar is to heavy section and be used for beam-and-rail;
-chain-type cooling bed can be used for medium-sized section bar and heavy section;
-be applicable to round steel and medium-sized section bar as the described roller cooling bed of DE1527709.
All these basic model cold beds all are common and they can be applied in the suitable rolling shedule best.
As in some cold beds, the section bar that is cut into cold bed length continuously can be braked and be transmitted reliably under the changeless situation of space width reliably.Other cold bed requires to be suitable for corresponding to the original length of cold bed length the difference stacking of the corresponding profile on step rate or chain, but can not transmit round steel or similar section bar in rack tooth exactly.Aspect industrial applicability, have at present following requirement, promptly can be according to customer requirements and need not extensively in some single milling trains, to produce to reconstruction wide section bar promptly resemble round steel, band steel, square steel and hexagon steel such little, in, heavy section.In the milling train known to so far, because above-mentioned specialized former thereby do not exist can be according to user's specific (special) requirements and the possibility of flexible response.Used the present invention as described below at this.
Task of the present invention is the defective of described prior art when avoiding beginning and the apparatus and method that a kind of the above-mentioned type in rolling mill is provided, and they are applicable to following requirement:
-rolled piece is divided into cold bed length;
-brake various section bars and pass to section bar rack cooling bed continuously;
-on rack cooling bed with a best chilling room corresponding to the section bar width apart from storing profiles;
-utilizing round steel being stored under the situation of displacement in tooth bar when bottom of rack cooling bed preliminary election, specify round steel to stack;
-in the tooth bar bottom of preliminary election, specify band steel and section bar to stack;
-keep required section steel straightening temperature in the cold bed outlet;
-round steel is hierarchically sent to discharging roller table and as single steel section bar passed to discharging roller table.
According to the present invention, utilize the feature of claim 1 to finish above-mentioned task, promptly utilize a kind of like this will be still in rolling mill to pass to its form be that the rack cooling bed and method described section bar of lateral transport on this is rack cooling bed with rack system of static rack and carry-over bar has been finished above-mentioned task in order to roll wide specification section bar heat and rolled piece that be cut into single steel, wherein each bar steel is braked on the feeding roller table that rack system tilts at one, on the tooth bar bottom of a preliminary election of the static rack of rack system, deposit described steel according to bar steel shape and size thereof in accordance with regulations or the bar steel is put into bottom the described tooth bar with specifying, by the horizontal mobile bar steel of rack system and where necessary it is aligned, by chain conveyor the bar steel is supplied with a discharging roller table as the bar steel of single placement subsequently, or several steel were moved before arriving discharging roller table with flushing on chain conveyor and these steel are supplied with discharging roller table as the rolled piece layer.
Stipulate in a favourable layout of the present invention: the bar steel that is shaped as small round steel or medium-sized round steel is braked the static rack of rack system was lifted and rolled into independently or slipped in the back by a braking flashboard system the tooth bar bottom of preliminary election at it on feeding roller table, heavy section, skid-resistant section bar and sensitivity, yielding section bar is then lifted the centre position of avoiding the section bar upset into one by braking flashboard system, makes above-mentioned section bar lift and put it into the tooth bar bottom of preliminary election of static rack of rack system from braking flashboard system by a transfer device subsequently.
In arranging, recommend of the present invention another: under the situation at little section bar, each tooth bar bottom of the static rack of rack system is all occupied by little section bar, and under the situation of medium-sized section bar and heavy section, based on the former of cooling technology thereby selected distance between stored bigger steel.
In addition, further regulation in a creative improvement project: each root bar steel is passed to the mode of rack system, respectively waits to deposit the selection of the distance between the bar steel and to continue the bar steel is flowed to discharging roller table be manually operated, or regulate in advance in a computer system according to rolling shedule and correspondingly consider above-mentioned factor.
Will be still in rolling mill to pass to its form be that the rack cooling bed and characteristic the above-mentioned type device described section bar of lateral transport on this is rack cooling bed with rack system of static rack and carry-over bar is in order to roll wide specification section bar heat and rolled piece that be cut into single steel: in the feeding roller table district, be attached troops to a unit a liftable braking flashboard system and the transmission system that can swing and move of rack system, between rack system and discharging roller table, be provided with a liftable chain conveyor for this rack system in bar steel input side in bar steel input side.
Another favourable improvement project regulation: liftable braking flashboard system can be introduced into the centre position in its range.
Stipulated equally: the transmission system that can swing and move has a plurality of transfer devices of arranging and synchronously working successively vertically, these transfer devices have an arm that connects material that is used for the bar steel respectively, and this arm that connects material itself is placed in one again regularly can be along the direction of rack system on a dolly that can move in the guide rail of the arm of a spot wobble.
In another favourable layout of the present invention, carry-over bar has one and is supported at least four supports on the point, so that by one or more but preferably two have two eccentric drivable longitudinal axis that are placed on distolateral respectively and constitute supporting construction, this eccentric wheel itself rests a roller on the wedge and links to each other with one by the connecting rod of a supporting rotationally respectively, this support is connected with eccentric wheel rotationally by a bearing on the one hand, has a bearing that is slidably mounted on the roller on the other hand.
In addition, but it is one or more fixing can swing in the blocks of conveying track to have attached troops to a unit for for the bar steel is moved with flushing liftable chain conveyor, and this is suitable.
The advantage of answer of the present invention is particularly in such possibility is arranged: can produce and continue to process wide specification section bar and correspondingly according to different user requirement flexible response and need not a large amount of reconstruction projects.
Schematically other details of the present invention, characteristics and advantage have been drawn the description of the embodiment of expression from following in the drawings to one.Wherein:
Fig. 1 is the schematic top plan view that comprises the milling train cold bed of peripheral equipment.
Fig. 2 is the front view of Fig. 1.
Fig. 3 is the schematic diagram of feed zone I shown in Figure 2.
Fig. 4 is the schematic diagram of rack system II shown in Figure 2.
Fig. 5 is the schematic diagram of discharge zone III shown in Figure 2.
According to Fig. 1 and Fig. 2, to be divided into three zones according to process sequence be feed zone I, real rack system II and discharge zone III for common cold bed (here being rack cooling bed) in the hot-rolling mill.
At this moment, it is supplied with cold bed 2 and is cut to cold bed length after still leaving last mill stand 1 according to technology for the rolled piece that rolls heat.Subsequently, on the feeding roller table 4 of the feed zone I that tilts to the rack system II, transmit and brake each root bar steel 3, send it tooth bar bottom 5 of preliminary election of the static rack 6 of rack system II to according to bar steel shape and size thereof, and by the rack system II that constitutes by above-mentioned static rack 6 and carry-over bar 7 along the horizontal mobile bar steel of discharge zone III direction and where necessary it is aligned, supply with discharging roller tables 9 by a known chain-linked conveyer 8 own as single bar steel 3 subsequently, perhaps earlier the bar steel is moved with flushing, as bar steel layer the bar steel is supplied with discharging roller table 9 subsequently.
Sending bar steel 3 to static rack 6 mainly is that slip by appointment or the placement by its appointment realize.So select the gradient of feeding roller table, promptly round steel can roll independently.In this case, the bar steel 3 that is shaped as small round steel or medium-sized round steel is lifted and slips into independently in the tooth bar bottom 5 of preliminary election of static rack 6 by a braking flashboard system 10 after it is braked on feeding roller table 4.
In contrast, by braking flashboard system 10 heavy section, skid-resistant section bar and responsive, yielding section bar are risen to a centre position of avoiding the upset or the slip of various section bars.Subsequently, make bar steel 3 rise and it is sent into the tooth bar bottom 5 of preliminary election of static rack 6 with being placed in accordance with regulations by the so-called transmission system 11 of swinging and moving from braking flashboard system 10.
It should be noted that: under the situation of little section bar, all occupied in each tooth bar bottom 5 of static rack 6, and under the situation of medium-sized section bar or heavy section, selected bigger distance based on the former of cooling technology thereby between stored steel 3.
Select following condition:
-according to the section bar width section bar is deposited into each tooth bar bottom 5, or per two tooth bars bottom, or under the bigger situation of section bar width, with a best chilling room that covers tooth apart from placing section bar;
-band steel is put into each tooth bar bottom 5 or put into per two tooth bars bottom 5;
-large-scale round steel and similar section bar are put into per two tooth bars bottom 5;
-little round steel rolls into tooth bar bottom 5 independently, and wherein here each tooth bar bottom 5 is all occupied.
As Fig. 3 shown at length and as described above, braking flashboard system 10 be make can lifting and itself constitute by promoting flashboard 12, each all lifts this flashboard bar steel 3 to the rack system II from feeding roller table 4 according to desirable transfer mode by curved bar 13, pull bar 14 and crank driving device 15.In addition, braking flashboard system 10 is furnished with a known system for partition wall 16 own, itself constitutes by separating flashboard, this separation flashboard drives by curved bar 13, pull bar 14 and crank driving device 15 equally and carries out such task, promptly longitudinally cuts apart feeding roller table 4 so that bar steel 3 that follow continuously along side feed and that turn to by the drive unit that is not shown specifically is adjacent with the bar steel 3 that moves ahead that has been braked.When promptly independent that slide or the section bar that rolls of rolling small-sized steel and littler section bar, mainly adopt this method.As if for the heavy section of depositing by thought of the present invention, above-mentioned working condition is inapplicable.In this case, heavy section only enters the side that turns to the rack system II at feeding roller table 4.
The transmission system 11 that can swing and move has the transfer device 17 that a plurality of front and back are vertically arranged and worked asynchronously, they have an arm 18 that connects material that is used for bar steel 3 respectively, and this arm that connects material itself is placed in one regularly and can uses on the dolly 21 that for example wheel moves in the guide rail that is not shown specifically of the arm 20 that fulcrum 19 is swung at one along the direction of rack system II.The arm 18 that connects material preferably is bent upwards and makes has a tooth bar shape bar steel material-receiving device.
The mobility of the turnability of arm 20 and dolly 21 is respectively to realize that by the electric motor driven crank driving device 22 of the usefulness of a band lever described lever itself is fixed on again on arm 20 or the dolly 21.
So just can guarantee,, can arrive the exact position of tooth bar bottom 5 of the preliminary election separately of static rack 6 by dolly 21.
What also need further to note is: each bar steel 3 is passed to the rack system II mode, each single distance of waiting to deposit 3 of bar steel selection and to continue to send the bar steel to discharging roller table 9 (Fig. 2) be manually operated, perhaps in a computer system, regulate in advance according to rolling shedule and correspondingly consider above-mentioned factor.
Fig. 4 schematically shows it and is shaped as the rack cooling bed of rack system II with carry-over bar 7 and static rack 6 and it makes bigger width as system.So, can in whole width range, transmit round steel reliably.Concerning section bar,, there are enough cool times available in order to reach straightening temperature.
Support and transmission problem for based on the former of rack system II broad thereby generation, can find following answer:
By one or more and be to have two drivable longitudinal axis 24 that are placed in the eccentric wheel 25 on distolateral respectively by two to realize supporting structures in a preferred embodiment, wherein eccentric wheel 25 itself links to each other with a roller 28 that rests on the wedge 27 by the connecting rod 26 of a rotatably support respectively again.
The discharge zone III of in Fig. 5, having drawn rack cooling bed in detail.Be delivered to a chain conveyor 8 on each root bar steel 3 driven tooth bar 7.This chain-linked conveyer is designed to again that itself is liftable, so as can to make transfer chain 32 drop to discharging roller table 9 transport roller 33 the upper limb below and with this bar steel 3 that is received is passed to transfer chain.It is suitable being designed to chain conveyor 8 around fulcrum 34 vertical oscillations of cold bed side.One or more fixing but can swing in the block 35 of the conveying track of electric motor driven chain conveyor 8 and keep bar steel 3 here, so that can the bar steel be supplied with rearmounted straightener 36 (Fig. 1) by root by discharging roller table 9.
Under situation about bar steel 3 hierarchically being delivered to as round steel and similar section bar on the discharging roller table 9, can only adopt a block 35 as required so that section bar flushes mobile.
Preferably block 35 is moved by pneumatic linear actuator 37.
Claims (9)
1. one kind will still pass to its form for having static rack and carry-over bar (6 for rolling wide specification section bar heat and rolled piece that be cut into single steel (3) in rolling mill, rack cooling bed and the method described steel of lateral transport (3) on this is rack cooling bed of rack system II 7), wherein
-each bar steel (3) is braked on the rack system II is inclined the feeding roller table (4) of expecting at one;
-according to bar steel shape and size thereof, on the tooth bar bottom (5) of a preliminary election of the static rack (6) of rack system II, place described steel in accordance with regulations or the bar steel specified and put into described tooth bar bottom (5);
-by the horizontal mobile bar steel of rack system II and where necessary it is aligned;
-by chain conveyor (8) the bar steel is supplied with a discharging roller table (9) as the bar steel (3) of single placement subsequently; Or
-several steel (3) are moved on chain conveyor (8) before with flushing and as the rolled piece layer these steel supplied with discharging roller table (9) arriving discharging roller table (9).
2. the method for claim 1, it is characterized in that, the bar steel (3) that becomes small round steel or medium-sized round steel shape is braked the static rack (6) of rack system II was lifted and rolled into independently or slip in the back by a braking flashboard system (10) the tooth bar bottom (5) of preliminary election at it on feeding roller table (4), heavy section, skid-resistant section bar and sensitivity, yielding section bar is then lifted the centre position of avoiding section bar upset into one by braking flashboard system (10), lifts described section bar and it is placed into the tooth bar bottom (5) of preliminary election of the static rack (6) of rack system II from braking flashboard system (10) by a transfer device (17) subsequently.
3. method as claimed in claim 1 or 2, it is characterized in that, under the situation of small material, each tooth bar bottom (5) of the static rack of rack system II (6) is all occupied by little section bar, and under the situation of medium-sized section bar and heavy section, between the bar steel of being placed (3), selected bigger distance based on the reason of cooling technology.
4. as the described method of one of claim 1-3, it is characterized in that, each root bar steel (3) is passed to the mode of rack system II, respectively waits to deposit the selection of the distance between bar steel (3) and to continue the bar steel is flowed to discharging roller table (9) be manually operated, or regulate in advance in a computer system according to rolling shedule and correspondingly consider above-mentioned factor.
5. one kind will still pass to its form for having static rack and carry-over bar (6 for rolling wide specification section bar heat and rolled piece that be cut into single steel (3) in rolling mill, rack cooling bed and the device described steel of lateral transport (3) on this is rack cooling bed of rack system II 7), wherein
-in feeding roller table (4) district, be the rack system II liftable braking flashboard system (10) of having attached troops to a unit in bar steel input side,
-be this rack system transmission system (11) that can swing and move of having attached troops to a unit,
-between rack system II and discharging roller table (9), be this rack system liftable chain conveyor (8) of having attached troops to a unit in bar steel outlet side.
6. device as claimed in claim 5 is characterized in that, liftable braking flashboard system (10) can be introduced into the centre position in its range.
7. device as claimed in claim 5, it is characterized in that, the transmission system (11) that can swing and move has a plurality of transfer devices (17) of arranging and synchronously working successively vertically, these transfer devices have an arm that connects material (18) that is used for bar steel (3) respectively, and this arm that connects material itself is placed in one again regularly can be along the direction of rack system II on a dolly (21) that can move in the guide rail of the arm (20) of fulcrum (19) swing.
8. device as claimed in claim 5, it is characterized in that, carry-over bar (7) has one and is supported at least four supports (23) on the point, so that by one or more but preferably two have two drivable longitudinal axis (24) that are placed in the eccentric wheel (25) on distolateral respectively and constitute supporting construction, this eccentric wheel links to each other with a roller (28) that rests on the wedge (27) by a connecting rod (26) that supports rotationally respectively again, support (23) links to each other with eccentric wheel (25) rotationally by a bearing (29) on the one hand, has a bearing (30) that is slidably mounted on the roller (28) on the other hand.
9. device as claimed in claim 5 is characterized in that, moves in order to make bar steel (3) with flushing, one or more fixing blocks (35) that still can swing in conveying track of having attached troops to a unit in liftable chain conveyor (8).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1997154937 DE19754937A1 (en) | 1997-12-11 | 1997-12-11 | Transferring a broad variety of profile segments still rolling-warm onto a cooling bed |
| DE19754937.3 | 1997-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1220194A true CN1220194A (en) | 1999-06-23 |
Family
ID=7851470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98124208 Pending CN1220194A (en) | 1997-12-11 | 1998-11-11 | Method and device for conveying wide specification section to rack cooling bed in rolling mill |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1220194A (en) |
| DE (1) | DE19754937A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103736682A (en) * | 2013-11-13 | 2014-04-23 | 钱江弹簧（北京）有限公司 | Pass-type high-pressure water spraying cleaning machine |
| CN104492830A (en) * | 2014-12-12 | 2015-04-08 | 芜湖新兴铸管有限责任公司 | Cooling bed steel flat supporting trolley |
| CN108746219A (en) * | 2018-07-19 | 2018-11-06 | 邯郸中威机械有限公司 | The step cooling bed equipment and production method of unlike material flat hot rolled bar mixed production |
| CN110586666A (en) * | 2019-08-12 | 2019-12-20 | 唐山钢铁集团有限责任公司 | Sliding plate steel for cooling bed slideway and hot rolling method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252830B (en) * | 2019-07-04 | 2024-08-23 | 北京科技大学 | Off-line control rolling method for mechanically moving intermediate rolled piece |
-
1997
- 1997-12-11 DE DE1997154937 patent/DE19754937A1/en not_active Withdrawn
-
1998
- 1998-11-11 CN CN 98124208 patent/CN1220194A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103736682A (en) * | 2013-11-13 | 2014-04-23 | 钱江弹簧（北京）有限公司 | Pass-type high-pressure water spraying cleaning machine |
| CN103736682B (en) * | 2013-11-13 | 2015-09-23 | 钱江弹簧（北京）有限公司 | Through type high-pressure water jet cleaner |
| CN104492830A (en) * | 2014-12-12 | 2015-04-08 | 芜湖新兴铸管有限责任公司 | Cooling bed steel flat supporting trolley |
| CN108746219A (en) * | 2018-07-19 | 2018-11-06 | 邯郸中威机械有限公司 | The step cooling bed equipment and production method of unlike material flat hot rolled bar mixed production |
| CN108746219B (en) * | 2018-07-19 | 2024-06-04 | 邯郸中威机械有限公司 | Stepping cooling bed equipment for collinear production of hot rolled flat steel of different materials and production method |
| CN110586666A (en) * | 2019-08-12 | 2019-12-20 | 唐山钢铁集团有限责任公司 | Sliding plate steel for cooling bed slideway and hot rolling method thereof |
| CN110586666B (en) * | 2019-08-12 | 2020-10-02 | 唐山钢铁集团有限责任公司 | Sliding plate steel for cooling bed slideway and hot rolling method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19754937A1 (en) | 1999-06-17 |
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