CA2192887A1 - Method and plant for the hot rolling of strip - Google Patents
Method and plant for the hot rolling of stripInfo
- Publication number
- CA2192887A1 CA2192887A1 CA002192887A CA2192887A CA2192887A1 CA 2192887 A1 CA2192887 A1 CA 2192887A1 CA 002192887 A CA002192887 A CA 002192887A CA 2192887 A CA2192887 A CA 2192887A CA 2192887 A1 CA2192887 A1 CA 2192887A1
- Authority
- CA
- Canada
- Prior art keywords
- strip
- stand
- length
- broken
- rolling
- 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
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005098 hot rolling Methods 0.000 title claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 30
- 238000004904 shortening Methods 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000004804 winding Methods 0.000 claims 1
- 230000009467 reduction Effects 0.000 description 3
- 230000008092 positive effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012432 intermediate storage Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
- B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
- B21B37/52—Tension control; Compression control by drive motor control
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
A method and a plant for the hot rolling of strip, in which the rolling stock is rolled in at least one reversing roughing stand with a number of roughing passes into a broken-down strip, and the broken-down strip is transported over an intermediate roller table into at least one Steckel finishing stand and the strip is finish-rolled in the finishing stand with a number of passes into a finished strip having a predetermined thickness, and the strip is finally wound into a coil. The length of the intermediate roller table determined by the length of the broken-down strip is shortened and tandem rolling is carried out in the roughing stand and the finishing stand at least during the last breaking-down pass of the strip.
Description
R~C~O~ ~F THE lN V~ ON
1. Field of the Invention The present invention relates to a method and a plant for the hot rolling of strip, in which the rolling stock is rolled in at least one reversing roughing stand with a number of roughing passes into a broken-down strip, and the broken-down strip is transported over an intermediate roller table into at least one Steckel finishing stand and the strip is finish-rolled in the finishing stand with a number of passes into a finished strip having a predetermined thickness, and the strip is finally wound into a coil.
1. Field of the Invention The present invention relates to a method and a plant for the hot rolling of strip, in which the rolling stock is rolled in at least one reversing roughing stand with a number of roughing passes into a broken-down strip, and the broken-down strip is transported over an intermediate roller table into at least one Steckel finishing stand and the strip is finish-rolled in the finishing stand with a number of passes into a finished strip having a predetermined thickness, and the strip is finally wound into a coil.
2. Description of the Related Art In a method and a plant for carrying out the method in the prior art, it is conventional to select the length of the roller table between the roughing stand and the Steckel finishing stand in such a way that, after emerging from the roughing stand, the broken-down strip rests "freely" between the roughing stand and the cropping shears. Accordingly, the length of the roller table is essentially determined by the length of the broken-down strip.
` -This results in the disadvantage that either the length of the broken-down strip, and thus, the predetermined charge weight of the product are limited, or that the plant requires a relatively large space, wherein, in that case, there is the additional disadvantage that the broken-down strip enters the Steckel finishing stand with a low temperature because of the heat loss occurring on the relatively long transport path between roughing stand and Steckel finishing stand. The increased load in the finishing stand caused by the lower temperature of the strip has a disadvantageous effect on the finish-rolling process, wherein additionally smaller reductions are achieved in each pass.
-~_ 21 92887 SUMMARY OF THE lN V~. llON
Therefore, it is the primary object of the present invention to provide a method and a plant for the hot rolling of strip of the type described above in which the disadvantages discussed above are avoided and hot rolling can be carried out with the use of uncomplicated measures and means.
In accordance with the present invention, in the method of the type described above, the length of the intermediate roller table determined by the length of the broken-down strip is shortened and t~n~em rolling is carried out in the roughing stand and the finishing stand at least during the last breaking-down pass of the strip.
The possibility of shortening the roller table is advantageously provided in accordance with the present invention by dropping the requirement for a "free" runout of the broken-down strip following one of the last roughing passes or following the last roughing pass, and by instead carrying out t~n~m rolling by the roughing stand and the finishing stand, wherein the rolling speeds of the stands are synchronized.
In addition to shortening the roller table, and, thus, a corresponding linear shortening of the total length of the plant and decreased investment and operating costs, the present invention further provides the significant advantage that the broken-down strip has a higher temperature when it enters the Steckel finishing stand. This has a positive effect on finish-rolling and, for example, facilitates lower loads in the finishing stand and produces greater reductions.
The plant for the hot rolling of strip according to the present invention includes at least one reversing breaking-down stand for breaking down the strip and at least one Steckel finishing stand for reducing the broken-down strip to finished strip, wherein the roughing stand and the finishing stand are connected to each other through a roller table whose length is determined by the length of the broken-down strip. The plant is intended especially for carrying out the above-described method according to the present invention and is characterized in that the length of the roller table corresponds at most to the length of the broken-down strip prior to one of the last breaking-down passes.
The length of the roller table may approximately correspond to the distance between the roughing stand and the shears.
_ 2 1 92887 The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive manner 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 illustration of a conventional plant for the hot rolling of strip; and Fig. 2 is a schematic illustration of a plant for the hot rolling of strip according to the present invention.
- 2 1 ~2887 DESCRIPTION OF T~E PREFERRED ~MRODIMENTS
Fig. 1 of the drawing shows a prior art embodiment of a plant for the hot-rolling of strip which includes at least one reversing roughing stand 1 for breaking-down rolling of a strip 10 and at least one Steckel finishing stand 3 for reducing the broken-down strip 10 into finished strip. Both plant components, i.e., roughing stand 1 and finishing stand 3, are connected to each other through an intermediate roller table 2.
As shown in Fig. 1, in the conventional plant, the length of the intermediate table 2 is selected in such a way that, after emerging from the roughing stand 1 which may be the last roughing stand of a sequence of roughing stands, the broken-down strip 10 is placed freely between the roughing stand 1 and the cropping shears 4. This means that the length of the intermediate roller table 2 is determined essentially by the length of the broken-down strip.
Solutions with intermediate storage units or coil boxes, which are usually used in tandem rolling trains for hot strip and facilitate shortening of the distance between the roughing stand and the finishing train, have not become known in the past in Steckel rolling trains. As shown in Fig. 1, the broken-down strip has the length L1 which corresponds to the distance between roughing stand 1 and cropping shears 4 and which is substantially shorter than the distance A1 between the roughing stand 1 and the finishing stand 3. As it is known in the art, the finishing stand 3 includes reeling furnaces 5 and 6.
An embo~;m~nt of the plant according to the present invention is shown in Fig. 2. In that embodiment, the length A2 of the intermediate roller table 2 is at most equal to the length L2 of the broken-down strip 10 prior to the roughing pass n-1, wherein n is the number of passes in the roughing stand.
In the following, the invention will be explained in more detail with the aid of an example.
Example:
The following parameters are given:
- Weight: 18kg/mm - Thickness of broken-down strip: 25mm - Length of broken-down strip: 94,74mm In the conventional plant according to Fig. 1, the distance between the roughing stand 1 and the finishing stand 3 is - 2 i 92887 approximately 120m, wherein the number of passes in the roughing stand 1 is n. The broken-down strip 10 just rolls out freely onto the intermediate roller table 2 between the roughing stand 1 and the cropping shears 4.
In accordance with the present invention as illustrated in Fig. 2, when the roller table is shortened to a length A2 in accordance with a broken-down strip length during pass n-2, tandem rolling in roughing stand 1 and finishing stand 3 takes place because the strip 10 having the length L2 is longer than the distance A2 between the roughing stand 1 and the finishing stand 3.
- Coil weight: 18kg/mm - Thickness of broken-down strip (n-2): 25mm x 1/0.75 x 1/0.75 =
44.44mm (assuming a reduction of 25~ each in the last two roughing passes) - Length of broken-down strip (n-2): 53.29mm Consequently, the required length of the intermediate roller table 2 can be reduced by 94.74m - 53.29m = 41.45m .
As explained above, in addition to shortening the length of the intermediate roller table, the present invention provides the advantage of an increased temperature of the broken-down strip which has positive effects on finish-rolling.
In accordance with the method of the present invention, during tandem rolling, the rolling speeds of roughing stand 1 and finishing stand 3 are synchronized.
In addition, it is possible during tandem rolling to synchronize the transport speed and the transport direction of the intermediate roller table with the rolling speed and the rolling direction of the roughing stand 1 and the finishing stand 3.
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.
` -This results in the disadvantage that either the length of the broken-down strip, and thus, the predetermined charge weight of the product are limited, or that the plant requires a relatively large space, wherein, in that case, there is the additional disadvantage that the broken-down strip enters the Steckel finishing stand with a low temperature because of the heat loss occurring on the relatively long transport path between roughing stand and Steckel finishing stand. The increased load in the finishing stand caused by the lower temperature of the strip has a disadvantageous effect on the finish-rolling process, wherein additionally smaller reductions are achieved in each pass.
-~_ 21 92887 SUMMARY OF THE lN V~. llON
Therefore, it is the primary object of the present invention to provide a method and a plant for the hot rolling of strip of the type described above in which the disadvantages discussed above are avoided and hot rolling can be carried out with the use of uncomplicated measures and means.
In accordance with the present invention, in the method of the type described above, the length of the intermediate roller table determined by the length of the broken-down strip is shortened and t~n~em rolling is carried out in the roughing stand and the finishing stand at least during the last breaking-down pass of the strip.
The possibility of shortening the roller table is advantageously provided in accordance with the present invention by dropping the requirement for a "free" runout of the broken-down strip following one of the last roughing passes or following the last roughing pass, and by instead carrying out t~n~m rolling by the roughing stand and the finishing stand, wherein the rolling speeds of the stands are synchronized.
In addition to shortening the roller table, and, thus, a corresponding linear shortening of the total length of the plant and decreased investment and operating costs, the present invention further provides the significant advantage that the broken-down strip has a higher temperature when it enters the Steckel finishing stand. This has a positive effect on finish-rolling and, for example, facilitates lower loads in the finishing stand and produces greater reductions.
The plant for the hot rolling of strip according to the present invention includes at least one reversing breaking-down stand for breaking down the strip and at least one Steckel finishing stand for reducing the broken-down strip to finished strip, wherein the roughing stand and the finishing stand are connected to each other through a roller table whose length is determined by the length of the broken-down strip. The plant is intended especially for carrying out the above-described method according to the present invention and is characterized in that the length of the roller table corresponds at most to the length of the broken-down strip prior to one of the last breaking-down passes.
The length of the roller table may approximately correspond to the distance between the roughing stand and the shears.
_ 2 1 92887 The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive manner 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 illustration of a conventional plant for the hot rolling of strip; and Fig. 2 is a schematic illustration of a plant for the hot rolling of strip according to the present invention.
- 2 1 ~2887 DESCRIPTION OF T~E PREFERRED ~MRODIMENTS
Fig. 1 of the drawing shows a prior art embodiment of a plant for the hot-rolling of strip which includes at least one reversing roughing stand 1 for breaking-down rolling of a strip 10 and at least one Steckel finishing stand 3 for reducing the broken-down strip 10 into finished strip. Both plant components, i.e., roughing stand 1 and finishing stand 3, are connected to each other through an intermediate roller table 2.
As shown in Fig. 1, in the conventional plant, the length of the intermediate table 2 is selected in such a way that, after emerging from the roughing stand 1 which may be the last roughing stand of a sequence of roughing stands, the broken-down strip 10 is placed freely between the roughing stand 1 and the cropping shears 4. This means that the length of the intermediate roller table 2 is determined essentially by the length of the broken-down strip.
Solutions with intermediate storage units or coil boxes, which are usually used in tandem rolling trains for hot strip and facilitate shortening of the distance between the roughing stand and the finishing train, have not become known in the past in Steckel rolling trains. As shown in Fig. 1, the broken-down strip has the length L1 which corresponds to the distance between roughing stand 1 and cropping shears 4 and which is substantially shorter than the distance A1 between the roughing stand 1 and the finishing stand 3. As it is known in the art, the finishing stand 3 includes reeling furnaces 5 and 6.
An embo~;m~nt of the plant according to the present invention is shown in Fig. 2. In that embodiment, the length A2 of the intermediate roller table 2 is at most equal to the length L2 of the broken-down strip 10 prior to the roughing pass n-1, wherein n is the number of passes in the roughing stand.
In the following, the invention will be explained in more detail with the aid of an example.
Example:
The following parameters are given:
- Weight: 18kg/mm - Thickness of broken-down strip: 25mm - Length of broken-down strip: 94,74mm In the conventional plant according to Fig. 1, the distance between the roughing stand 1 and the finishing stand 3 is - 2 i 92887 approximately 120m, wherein the number of passes in the roughing stand 1 is n. The broken-down strip 10 just rolls out freely onto the intermediate roller table 2 between the roughing stand 1 and the cropping shears 4.
In accordance with the present invention as illustrated in Fig. 2, when the roller table is shortened to a length A2 in accordance with a broken-down strip length during pass n-2, tandem rolling in roughing stand 1 and finishing stand 3 takes place because the strip 10 having the length L2 is longer than the distance A2 between the roughing stand 1 and the finishing stand 3.
- Coil weight: 18kg/mm - Thickness of broken-down strip (n-2): 25mm x 1/0.75 x 1/0.75 =
44.44mm (assuming a reduction of 25~ each in the last two roughing passes) - Length of broken-down strip (n-2): 53.29mm Consequently, the required length of the intermediate roller table 2 can be reduced by 94.74m - 53.29m = 41.45m .
As explained above, in addition to shortening the length of the intermediate roller table, the present invention provides the advantage of an increased temperature of the broken-down strip which has positive effects on finish-rolling.
In accordance with the method of the present invention, during tandem rolling, the rolling speeds of roughing stand 1 and finishing stand 3 are synchronized.
In addition, it is possible during tandem rolling to synchronize the transport speed and the transport direction of the intermediate roller table with the rolling speed and the rolling direction of the roughing stand 1 and the finishing stand 3.
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 (8)
1. In a method of hot-rolling of strip from rolling stock, including rolling the rolling stock in at least one reversing roughing stand with a number of passes into a broken-down strip having a length, transporting the broken-down strip over an intermediate roller table into at least one Steckel finishing stand and finish-rolling the broken-down strip in the Steckel finishing stand with a number of passes into a finished strip, and finally winding the strip into a coil, the improvement comprising shortening a length of the intermediate roller table determined by the length of the broken-down strip, and carrying out tandem rolling in the roughing stand and the finishing stand at least during a last roughing pass.
2. The method according to claim 1, comprising shortening the length of the intermediate roller table to a length which is shorter than the length of the broken-down strip.
3. The method according to claim 1, wherein the length of the intermediate roller is shortened to such an extent that tandem rolling of the broken-down strip in the roughing stand and the finishing stand can be carried out already during a second to last roughing pass.
4. The method according to claim 1, wherein rolling speeds of the roughing stand and the finishing stand are synchronized during tandem rolling.
5. The method according to claim 4, wherein during tandem rolling a transport speed and a transport direction of the intermediate roller table are synchronized with the rolling speed and the rolling direction of the roughing stand and the finishing stand.
6. A plant for the hot rolling of strip, comprising at least one reversing roughing stand for breaking-down rolling of a strip into a broken-down strip and at least one Steckel finishing stand for reducing the broken-down strip to a finished strip, further comprising an intermediate roller table connecting the roughing stand and the finishing stand, wherein a length of the intermediate roller table corresponds at most to a length of the broken-down strip prior to one of last roughing passes.
7. The plant according to claim 6, comprising shears upstream of the finishing stand, wherein the length of the intermediate roller table corresponds approximately to a distance between the finishing stand and the shears.
8. The plant according to claim 6, wherein the length of the intermediate roller table corresponds approximately to a length of the broken-down strip prior to the last roughing pass.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP19549208.0 | 1995-12-30 | ||
| DE19549208A DE19549208A1 (en) | 1995-12-30 | 1995-12-30 | Process and plant for hot rolling strips |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2192887A1 true CA2192887A1 (en) | 1997-07-01 |
Family
ID=7781684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002192887A Abandoned CA2192887A1 (en) | 1995-12-30 | 1996-12-13 | Method and plant for the hot rolling of strip |
Country Status (7)
| Country | Link |
|---|---|
| US (2) | US20030051525A1 (en) |
| EP (1) | EP0781609A1 (en) |
| KR (1) | KR970033127A (en) |
| CN (1) | CN1076639C (en) |
| CA (1) | CA2192887A1 (en) |
| DE (1) | DE19549208A1 (en) |
| TW (1) | TW391896B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6182490B1 (en) * | 1999-03-19 | 2001-02-06 | Danieli Technology Inc. | Super thin strip hot rolling |
| DE10349950A1 (en) * | 2003-10-24 | 2005-05-25 | Sms Demag Ag | Rolling mill for warm rolling of metals, including a hot strip roll chain, and blooming and finishing roll chains useful in rolling Al |
| FR2888763B1 (en) * | 2005-07-22 | 2008-10-03 | Vai Clecim Sa | INSPECTION METHOD AND ASSOCIATED INSTALLATION |
| JP5271512B2 (en) * | 2007-06-18 | 2013-08-21 | Ｉｈｉメタルテック株式会社 | Hot rolling equipment |
| CN113020279B (en) * | 2021-02-26 | 2023-05-12 | 首钢京唐钢铁联合有限责任公司 | Uncoiling leveling control method, device and system of leveling unit |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2322080A (en) * | 1939-12-15 | 1943-06-15 | Gen Electric | Control for runout tables of reversing mills |
| BE555649A (en) * | 1956-04-23 | |||
| US4348882A (en) * | 1980-01-28 | 1982-09-14 | Tippins Machinery Company, Inc. | Hot rolling strip |
| JPS5758903A (en) * | 1980-09-25 | 1982-04-09 | Nippon Steel Corp | Hot rolling method for hot strip |
| AT370346B (en) * | 1981-03-25 | 1983-03-25 | Voest Alpine Ag | PLANT FOR THE HOT ROLLING OF TAPE OR TABLED ROLLED GOODS |
| US4433566A (en) * | 1981-09-29 | 1984-02-28 | Tippins Machinery Company, Inc. | Close coupled reversing rougher and finishing train and method of rolling |
| AT380188B (en) * | 1982-03-05 | 1986-04-25 | Voest Alpine Ag | PLANT FOR THE HOT ROLLING OF TAPE OR TABLED ROLLED GOODS |
| US4503697A (en) * | 1983-01-25 | 1985-03-12 | Tippins Machinery Company, Inc. | Method for hot rolling slabs |
| JP3152241B2 (en) * | 1990-06-12 | 2001-04-03 | 株式会社日立製作所 | Hot thin plate manufacturing equipment and manufacturing method |
-
1995
- 1995-12-30 DE DE19549208A patent/DE19549208A1/en not_active Withdrawn
-
1996
- 1996-12-12 KR KR1019960064590A patent/KR970033127A/en not_active Application Discontinuation
- 1996-12-13 CA CA002192887A patent/CA2192887A1/en not_active Abandoned
- 1996-12-14 EP EP96120132A patent/EP0781609A1/en not_active Withdrawn
- 1996-12-19 TW TW085115671A patent/TW391896B/en not_active IP Right Cessation
- 1996-12-30 CN CN96118963A patent/CN1076639C/en not_active Expired - Fee Related
-
2002
- 2002-11-01 US US10/285,734 patent/US20030051525A1/en not_active Abandoned
-
2003
- 2003-10-30 US US10/701,415 patent/US20040089046A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20030051525A1 (en) | 2003-03-20 |
| CN1076639C (en) | 2001-12-26 |
| DE19549208A1 (en) | 1997-07-03 |
| CN1154276A (en) | 1997-07-16 |
| US20040089046A1 (en) | 2004-05-13 |
| KR970033127A (en) | 1997-07-22 |
| TW391896B (en) | 2000-06-01 |
| EP0781609A1 (en) | 1997-07-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |