EP3049197B1 - Rolling method - Google Patents
Rolling method Download PDFInfo
- Publication number
- EP3049197B1 EP3049197B1 EP14758807.3A EP14758807A EP3049197B1 EP 3049197 B1 EP3049197 B1 EP 3049197B1 EP 14758807 A EP14758807 A EP 14758807A EP 3049197 B1 EP3049197 B1 EP 3049197B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roll gap
- rolling
- rolled
- rolled product
- product
- 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.)
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- 238000005096 rolling process Methods 0.000 title claims description 52
- 238000000034 method Methods 0.000 title claims description 37
- 239000002184 metal Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 description 9
- 230000008859 change Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/06—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a non-continuous process, e.g. triplet mill, reversing mill
-
- 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
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/026—Rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
- B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
- B21B31/22—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal
- B21B31/24—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal by screws
-
- 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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
-
- 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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/24—Automatic variation of thickness according to a predetermined programme
- B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness
Definitions
- This invention relates to a method of rolling metal, in particular for production of high quality thick plate from ingots or thick slabs.
- JP S58044904 A describes the use of tapered rolling to spread the material in the tapered slab, then turning the rolled material and applying further rolling, so eventually forming a rectangular plate.
- GB 1 401 475 A discloses a method of rolling a metal plate from a thick slab, the method comprising:
- a method of rolling a metal plate from an ingot or thick slab in a screwdown mill featuring mechanical screws that cannot be moved under load, comprises setting a work roll gap with a mechanical screw and rolling the ingot or slab through a first pass extending over the full length of the ingot or slab to produce a rolled product; removing the rolled product from the roll gap and using the mechanical screw to set a reduced roll gap; rolling the rolled product through the reduced roll gap over a partial pass, the partial pass extending over less than the full length of the rolled product, to form a further rolled product; and removing the further rolled product from the roll gap; wherein the method further comprises turning the rolled plate through 90° and carrying out a further roll pass in a width direction (also known as broadsiding) of the plate.
- Rolling a metal plate, whether from an ingot or thick slab, using the method of the present invention to produce a rolled plate having a stepped profile allows older screwdown mills to be used to roll plate which has the required quality, without the loss of yield rendering the process uneconomical. Broadsiding of the rolled plate converts the thickness profile to a width increase in the plate geometry.
- the method further comprises using the mechanical screw to set a further reduced roll gap; rolling the further rolled product through the further reduced roll gap over a partial pass, the partial pass extending over less than the full length of the further rolled product.
- the method further comprises repeating the steps of removing the further rolled product from the roll gap, using the mechanical screw to set a further reduced roll gap and rolling the product over a partial pass for a set number of iterations to produce a rolled plate.
- the number of iterations is determined according to parameters of required yield loss and rolling time.
- the method further comprises counting the number of revolutions of the roll as the rolled product is removed from the roll gap to allow the next roll gap to be set; determining a difference in thickness between adjacent roll gap thickness settings; using the number of revolutions and determined difference in thickness to calculate the length of the product; and thereby deriving the length of the rolled product to be rolled at the next rolling stage.
- edger controlled multiple reversing passes to produce thick plate has been the most common method to date, although the advent of hydraulically operated automatic gauge control has enabled mills to be constructed which are able to overcome the problems of rolling tapered ingots or thick slabs, whilst still providing sufficient austenite strain for a fine-grained, high quality product.
- mechanical screw roll loading technology which either are not suitable, or economical to adapt to hydraulic cylinders and automatic gauge control.
- the present invention aims to improve the yield during thick plate production in these screwdown mills.
- Fig. illustrates how traditional cast ingots are tapered in thickness and width down their length. If standard rolling is applied to this type of ingot, without any special rolling strategy, then it can be seen from Fig.1 that the width taper will increase as the thickness is reduced. The result is a plate with uniform thickness, but with a width that tapers down the length. This results in a large amount of yield loss when shearing to form a rectangular product for sale.
- Figs.4a to 4d illustrate an example of the method of the present invention for rolling tapered ingots or thick slabs using a screwdown system and multiple roll gap changes in a rolling mill 24.
- the ingot or slab 20 is supported on a roller table 27 and moving in the direction of the arrow 30 enters a roll gap between work rolls 25 which roll gap has been pre-set.
- the slab 20 is rolled to a first thickness, as shown in Fig.4a to produce rolled slab 21, and the rolled slab exits the work roll gap supported on roller table 26.
- the screw is operated to change the roll gap by movement in the direction of the arrow 33 to the next required roll gap 34b and the process of rolling part of the length, stopping and reversing out of the roll gap is repeated.
- the work rolls are set to have a slightly smaller gap than the previous roll gap and the plate is rolled again.
- the slab formed has a section of thickness of the first roll gap and a section of thickness of each subsequent roll gap.
- the slab is reversed out of the work roll gap, so that the gap can be adjusted using the mechanical screws and then a next rolling pass reduces the thickness of the slab over a partial length, but does not roll all of the length of the previously rolled sections again.
- the rolling is not over the full length, but stops at a boundary of formed between the immediately proceeding section and the most recent section. Rolling, reversing out and adjustment of the roll gap continue until a desired minimum thickness of the final section has been reached.
- each rolling pass the rolled product becomes longer, so in order to control the point to which each subsequent pass should roll, the number of revolutions of the roll are counted.
- the difference in thickness between each step along the taper is known from the different gaps produced by each different screw setting, allowing a calculation of how much longer the slab has become and so how far to go back in for the next rolling stage.
- a constant ramp change which is used in systems having an AGC cylinder controlled system
- multiple step changes are induced to approximate the desired constant ramp change during the introduction of variable thickness taper. This is performed by adjusting roll gap using the mechanical screw for multiple rolling stages of decreasing roll gap and increasing roll length until the entire length is rolled. The result is a plate with a thickness profile similar to a staircase.
- Figs.5a and 5b show the profile in plan view and cross section respectively.
- Outline 11 indicates the shape of the ingot, seen from above, before rolling and outline 12 the shape after rolling.
- Outline 13 shows the cross section before rolling and outline 14, the cross section after rolling.
- step changes used in the rolling method is determined according to the process requirements. Where yield loss is less of an issue, a high yield loss is accepted by using fewer steps to get a low rolling time per ingot. If rolling time is not an issue, but reducing yield loss is important, then a greater number of steps are used, over a longer period of time.
- the method applied to the screwdown mill does not require the use of an edger with rolls before or after the mill to impart force to the edges on the plate. This helps make the process simpler and applicable to using basic mill technology.
- the present invention provides a process for rolling steel ingots, with both width and thickness tapers, into plate.
- the process may be used where the resulting plate has a thickness above 120mm, giving more uniform thickness and width throughout, without the need to use an edger in any passes.
- a further pass in width direction (broad siding) is used to convert the thickness profile to a width increase in the plate geometry.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Description
- This invention relates to a method of rolling metal, in particular for production of high quality thick plate from ingots or thick slabs.
- Market demand for high quality thick plate for the construction industry requires that the plates are rolled from either traditional ingots, or thick cast slabs. Both create significant processing problems and yield loss on the final plate. Normally ingots have variations or tapers in both thickness and width down their length which have to be removed during rolling. Once the variations have been removed the ingot can be processed in the same manner as a thick cast slabs. For the purpose of this application reference to either ingot, or thick slab should be read as including the other, unless otherwise stated.
- Traditionally thick plate rolling from ingots has been done using a rolling mill and a detached edger in a series of reversing passes, for example as described in
JP01053703 - Starting from a tapered slab,
JP S58044904 A - As described in a paper given at the 49th Rolling Seminar - Processes, Rolled and Coated Products, Vila Velha, Brasil, October 2012, entitled - Production of high quality thick construction plate from ingots and thick slabs, by S Samanta et al, mathematical models can be used with high speed long stroke hydraulic gap control cylinders to remove thickness and width variations before standard thick cast slab processing of the plate to minimise poor edge shape and increase final yield.
- However, a number of older mills are either not suitable or economical to convert to hydraulic gap control, so limiting the type of plate that they can produce.
-
GB 1 401 475 A - setting a work roll gap with a mechanical screw and rolling the slab through a first pass extending over the full length of the slab to produce a rolled product;
- removing the rolled product from the roll gap and using the mechanical screw to set a reduced roll gap;
- rolling the rolled product through the reduced roll gap over a partial pass, the partial pass extending over less than the full length of the rolled product, to form a further rolled product; and removing the further rolled product from the roll gap.
- In accordance with the present invention, a method of rolling a metal plate from an ingot or thick slab in a screwdown mill, featuring mechanical screws that cannot be moved under load, comprises setting a work roll gap with a mechanical screw and rolling the ingot or slab through a first pass extending over the full length of the ingot or slab to produce a rolled product; removing the rolled product from the roll gap and using the mechanical screw to set a reduced roll gap; rolling the rolled product through the reduced roll gap over a partial pass, the partial pass extending over less than the full length of the rolled product, to form a further rolled product; and removing the further rolled product from the roll gap; wherein the method further comprises turning the rolled plate through 90° and carrying out a further roll pass in a width direction (also known as broadsiding) of the plate.
- Rolling a metal plate, whether from an ingot or thick slab, using the method of the present invention to produce a rolled plate having a stepped profile allows older screwdown mills to be used to roll plate which has the required quality, without the loss of yield rendering the process uneconomical. Broadsiding of the rolled plate converts the thickness profile to a width increase in the plate geometry.
- Preferably, the method further comprises using the mechanical screw to set a further reduced roll gap; rolling the further rolled product through the further reduced roll gap over a partial pass, the partial pass extending over less than the full length of the further rolled product.
- Preferably, the method further comprises repeating the steps of removing the further rolled product from the roll gap, using the mechanical screw to set a further reduced roll gap and rolling the product over a partial pass for a set number of iterations to produce a rolled plate.
- Preferably, the number of iterations is determined according to parameters of required yield loss and rolling time.
- For each iteration, a section of the rolled product furthest from the work rolls, is left unrolled.
- Preferably, the method further comprises counting the number of revolutions of the roll as the rolled product is removed from the roll gap to allow the next roll gap to
be set; determining a difference in thickness between adjacent roll gap thickness settings; using the number of revolutions and determined difference in thickness to calculate the length of the product; and thereby deriving the length of the rolled product to be rolled at the next rolling stage. - An example of a method of rolling a metal plate from an ingot or thick slab in accordance with the present invention will now be described with reference to the accompanying drawings in which:
-
Figure 1 illustrates how conventional rolling of ingots tapered in thickness and width down their length increases the width taper, as thickness reduces; -
Figure 2 illustrates how the use of hydraulic control of rolling loads can be used to apply a thickness taper inversely proportional to the width taper in an ingot or thick slab; -
Figure 3 illustrates how the resulting slab ofFig.2 can be rolled to form a rectangular product. -
Figures 4a to 4d illustrate an example of a method according to the present invention; and, -
Figures 5a and 5b illustrate, in plan and cross-section, the changes as the method ofFig.4 converts a tapered product to a rectangular product. - Use of edger controlled multiple reversing passes to produce thick plate has been the most common method to date, although the advent of hydraulically operated automatic gauge control has enabled mills to be constructed which are able to overcome the problems of rolling tapered ingots or thick slabs, whilst still providing sufficient austenite strain for a fine-grained, high quality product. However, there are still many older mills using mechanical screw roll loading technology which either are not suitable, or economical to adapt to hydraulic cylinders and automatic gauge control.
- The present invention aims to improve the yield during thick plate production in these screwdown mills.
- Fig. illustrates how traditional cast ingots are tapered in thickness and width down their length. If standard rolling is applied to this type of ingot, without any special rolling strategy, then it can be seen from
Fig.1 that the width taper will increase as the thickness is reduced. The result is a plate with uniform thickness, but with a width that tapers down the length. This results in a large amount of yield loss when shearing to form a rectangular product for sale. - Using advances in hydraulic control of rolling loads, a process has been developed to add a variable thickness taper to the ingot, inversely proportionate to the ingot width taper, as illustrated by
Fig. 2 . This taper can then be rolled out by turning the ingot through 90° and rolling again in the width direction (broadsiding) in order to spread material and form a rectangular product, as shown inFig. 3 . It has been assumed that these advantages are only achievable where automatic gauge control and hydraulic cylinders are installed. The present invention provides a method by which similar improvements can be achieved in older screwdown mills. -
Figs.4a to 4d illustrate an example of the method of the present invention for rolling tapered ingots or thick slabs using a screwdown system and multiple roll gap changes in arolling mill 24. The ingot orslab 20 is supported on a roller table 27 and moving in the direction of thearrow 30 enters a roll gap betweenwork rolls 25 which roll gap has been pre-set. Theslab 20 is rolled to a first thickness, as shown inFig.4a to produce rolledslab 21, and the rolled slab exits the work roll gap supported on roller table 26. Mechanical screws in plate mills cannot usually be moved under load, so as shown inFig.4b , the screws are operated to reduce the gap betweenwork rolls 25 for the next pass of rolledplate 21, typically by movingwork roll 25 in the direction of the arrow 31. In the next pass, shown inFig.4c , the rolledplate 21 is moved through the reducedroll gap 34a in the direction of thearrow 32, but only apart 22 of the length of the rolledplate 21 is rolled again. When the required length of the rolled plate has been rolled to the new thickness, the rolling is stopped and the plate is reversed out of the mill. The plate is now formed of twoparts Fig.4d . The screw is operated to change the roll gap by movement in the direction of thearrow 33 to the next requiredroll gap 34b and the process of rolling part of the length, stopping and reversing out of the roll gap is repeated. Each time, the work rolls are set to have a slightly smaller gap than the previous roll gap and the plate is rolled again. - For each iteration, part of a previously rolled section is not rolled again, but the subsequent roll pass finishes at a predefined boundary between the previously rolled thickness and the new thickness. Thus, the slab formed has a section of thickness of the first roll gap and a section of thickness of each subsequent roll gap. For each change in roll gap, the slab is reversed out of the work roll gap, so that the gap can be adjusted using the mechanical screws and then a next rolling pass reduces the thickness of the slab over a partial length, but does not roll all of the length of the previously rolled sections again. In each successive pass, the rolling is not over the full length, but stops at a boundary of formed between the immediately proceeding section and the most recent section. Rolling, reversing out and adjustment of the roll gap continue until a desired minimum thickness of the final section has been reached.
- In each rolling pass, the rolled product becomes longer, so in order to control the point to which each subsequent pass should roll, the number of revolutions of the roll are counted. The difference in thickness between each step along the taper is known from the different gaps produced by each different screw setting, allowing a calculation of how much longer the slab has become and so how far to go back in for the next rolling stage. Instead of a constant ramp change, which is used in systems having an AGC cylinder controlled system, in a screwdown mill, multiple step changes are induced to approximate the desired constant ramp change during the introduction of variable thickness taper. This is performed by adjusting roll gap using the mechanical screw for multiple rolling stages of decreasing roll gap and increasing roll length until the entire length is rolled. The result is a plate with a thickness profile similar to a staircase. The resulting profile is illustrated in
Figs.5a and 5b , which show the profile in plan view and cross section respectively. Outline 11 indicates the shape of the ingot, seen from above, before rolling and outline 12 the shape after rolling.Outline 13 shows the cross section before rolling and outline 14, the cross section after rolling. - The precise number of step changes used in the rolling method is determined according to the process requirements. Where yield loss is less of an issue, a high yield loss is accepted by using fewer steps to get a low rolling time per ingot. If rolling time is not an issue, but reducing yield loss is important, then a greater number of steps are used, over a longer period of time.
- As with the hydraulic cylinder automatic gauge control system of modem mills, the method applied to the screwdown mill does not require the use of an edger with rolls before or after the mill to impart force to the edges on the plate. This helps make the process simpler and applicable to using basic mill technology.
- Although, a mechanical method of this type takes longer than using single pass AGC cylinder loading and results in more yield loss due to the spreading of plate steps into a saw tooth profile edge in final pass, the result is an improvement on existing operation of screwdown mills which can process material of the required quality.
- The present invention provides a process for rolling steel ingots, with both width and thickness tapers, into plate. The process may be used where the resulting plate has a thickness above 120mm, giving more uniform thickness and width throughout, without the need to use an edger in any passes. Mechanical screw loading using multiple unfinished passes, with discrete roll gap change between each, forms a stepped thickness profile. A further pass in width direction (broad siding) is used to convert the thickness profile to a width increase in the plate geometry.
Claims (5)
- A method of rolling a metal plate from an ingot or thick slab in a screwdown mill featuring mechanical screws that cannot be moved under load, the method comprising:setting a work roll gap with a mechanical screw and rolling the ingot or slab through a first pass extending over the full length of the ingot or slab to produce a rolled product; removing the rolled product from the roll gap and using the mechanical screw to set a reduced roll gap;rolling the rolled product through the reduced roll gap over a partial pass, the partial pass extending over less than the full length of the rolled product, to form a further rolled product; and removing the further rolled product from the roll gap;wherein the method further comprises turning the rolled plate through 90° and carrying out a further roll pass in a width direction (broadsiding) of the plate.
- A method according to claim 1, wherein the method further comprises using the mechanical screw to set a further reduced roll gap;
rolling the further rolled product through the further reduced roll gap over a partial pass, the partial pass extending over less than the full length of the further rolled product. - A method according to claim 1 or claim 2, wherein the method further comprises repeating the steps of removing the further rolled product from the roll gap, using the mechanical screw to set a further reduced roll gap and rolling the product over a partial pass for a set number of iterations to produce a rolled plate.
- A method according to claim 3, wherein the number of iterations is determined according to parameters of required yield loss and rolling time.
- A method according to any preceding claim, wherein the method further comprises counting the number of revolutions of the roll as the rolled product is removed from the roll gap to allow the next roll gap to be set; obtaining a difference in thickness between adjacent roll gap thickness settings; using the number of revolutions and difference in thickness to calculate the length of the product; and thereby deriving the length of the rolled product to be rolled at the next rolling stage.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1316917.2A GB2518444A (en) | 2013-09-24 | 2013-09-24 | Rolling Method |
PCT/EP2014/067678 WO2015043837A1 (en) | 2013-09-24 | 2014-08-19 | Rolling method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3049197A1 EP3049197A1 (en) | 2016-08-03 |
EP3049197B1 true EP3049197B1 (en) | 2018-01-31 |
Family
ID=49553306
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14758807.3A Active EP3049197B1 (en) | 2013-09-24 | 2014-08-19 | Rolling method |
Country Status (5)
Country | Link |
---|---|
US (1) | US20160271661A1 (en) |
EP (1) | EP3049197B1 (en) |
CN (1) | CN106061635A (en) |
GB (1) | GB2518444A (en) |
WO (1) | WO2015043837A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2903435T3 (en) * | 2016-09-29 | 2022-04-01 | Outokumpu Oy | Method for cold deformation of an austenitic steel |
JP6798567B2 (en) * | 2019-01-21 | 2020-12-09 | Jfeスチール株式会社 | Steel ingot rolling method |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5024899B2 (en) * | 1971-09-18 | 1975-08-19 | ||
JPS5844904A (en) * | 1981-09-10 | 1983-03-16 | Sumitomo Metal Ind Ltd | Rolling method for thick plate |
JPS58192607A (en) * | 1982-05-06 | 1983-11-10 | Sumitomo Metal Ind Ltd | Rolling method of thick steel plate |
JPS6061106A (en) * | 1983-09-16 | 1985-04-08 | Kawasaki Steel Corp | Rolling method of steel sheet with different thickness |
JPS61172603A (en) * | 1985-01-29 | 1986-08-04 | Sumitomo Metal Ind Ltd | Rolling of steel thick plate |
DE102006011939A1 (en) * | 2006-03-15 | 2007-09-27 | Siemens Ag | Rolling process for a rolling stock for introducing a step into the rolling stock |
CN1850376A (en) * | 2006-04-29 | 2006-10-25 | 东北大学 | Method for rolling trapezoidal width steel plate |
CN101406901B (en) * | 2008-11-14 | 2010-10-27 | 中冶陕压重工设备有限公司 | Control method for full-automatic reversible rolling of piece, block type molybdenum plate |
EP2500113A1 (en) * | 2011-03-14 | 2012-09-19 | Siemens Aktiengesellschaft | Method and mill train for milling a milled product produced using a block casting method, control and/or regulating device for a mill train, machine readable program code for a control and/or regulating device and storage medium |
-
2013
- 2013-09-24 GB GB1316917.2A patent/GB2518444A/en not_active Withdrawn
-
2014
- 2014-08-19 CN CN201480052739.5A patent/CN106061635A/en active Pending
- 2014-08-19 WO PCT/EP2014/067678 patent/WO2015043837A1/en active Application Filing
- 2014-08-19 EP EP14758807.3A patent/EP3049197B1/en active Active
-
2016
- 2016-03-22 US US15/077,474 patent/US20160271661A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
WO2015043837A1 (en) | 2015-04-02 |
GB2518444A (en) | 2015-03-25 |
GB201316917D0 (en) | 2013-11-06 |
US20160271661A1 (en) | 2016-09-22 |
EP3049197A1 (en) | 2016-08-03 |
CN106061635A (en) | 2016-10-26 |
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