CN107824613A - The universal rolling device and milling method of a kind of flat-bulb steel - Google Patents
The universal rolling device and milling method of a kind of flat-bulb steel Download PDFInfo
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- CN107824613A CN107824613A CN201711120286.7A CN201711120286A CN107824613A CN 107824613 A CN107824613 A CN 107824613A CN 201711120286 A CN201711120286 A CN 201711120286A CN 107824613 A CN107824613 A CN 107824613A
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- horizontal roller
- flat
- bulb
- edger roll
- lower horizontal
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 78
- 239000010959 steel Substances 0.000 title claims abstract description 78
- 238000005096 rolling process Methods 0.000 title claims abstract description 59
- 238000003801 milling Methods 0.000 title claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 30
- 150000001875 compounds Chemical class 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 235000013399 edible fruits Nutrition 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003079 width control Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008719 thickening Effects 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
- B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/10—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 structural sections, i.e. work of special cross-section, e.g. angle steel in a single two-high or universal rolling mill stand
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses the universal rolling device and milling method of a kind of flat-bulb steel, the universal rolling device includes universal mill unit, universal mill unit is made up of 36 frame universal mills, and any frame universal mill has upper horizontal roller (1), lower horizontal roller (2), fore side edger roll (3) and transmission side edger roll (4)；Do chamfering in the both ends of lower horizontal roller (2), horizontal roller (1), lower horizontal roller (2), fore side edger roll (3) and transmission side edger roll (4) is set to form combination flat-bulb steel rolling hole after combining, the shape for being shaped as two flat-bulb steels and combining in the combination flat-bulb steel rolling hole, the web of two flat-bulb steels is joined together to form compound web plate (6), and bulb is respectively positioned at the same side for the web that is connected as left leg (5) and right leg (7).The characteristics of present invention can roll out axisymmetric combination shape flat-bulb steel, have rolling accuracy high, be obviously improved rolling batch, and roll consumption is few.
Description
Technical field
The present invention relates to technical field of steel rolling, the universal rolling device and milling method of more particularly to a kind of flat-bulb steel.
Background technology
Flat-bulb steel is made up of flat web and spherical bulb, is a kind of special shaped steel of shape, is widely used in ship
Oceangoing ship, bridge and mechanical field, for carrying out structural strengthening, recently as the high speed development of shipbuilding industry, flat-bulb steel is in ship row
The application more next moon of industry is extensive, and application amount is also increasing, has been increasingly becoming the second big steel material for making hull steel in addition to steel plate
Material.At present, conventional rolling mill practice is to be made up of using rectangular bloom multiple cutting holes, pre-formed hole and forming hole, most finish to gauge
Standard flat-bulb steel shape is made, the technique is adapted to the production of small section rolling mill equipment, but low production efficiency, and rolling groove is more, and roll is thrown
Enter and consume big, and because flat-bulb steel bulb and web thickness difference are big, roller repairing is uneven, and bending is serious, to aligning and into
The control of product profile has undesirable effect.
Publication No. CN101190442A Chinese patent discloses a kind of bulb steel production technology, steel billet → heating → right
Claim rolling → aligning → subdivision, be characterized in adding subdivision technique using after symmetry rolling and aligning, each passage pass of milling train is by two
Individual symmetry equivalent flat-bulb steel pass is formed.The invention, which solves current large and medium-sized milling train, can not produce ting model flat-bulb steel, right
The problem of claiming rolling and partitioning techniques to produce flat-bulb steel, yield can be obviously improved.But due to the bulb of the Patent design
The gradient of lateral wall and vertical direction only has 4%-7%, causes the roll wear amount of corresponding position big, the same a collection of ball of production
Band steel width tolerance is larger, and dimensional uniformity is poor.In order to which width tolerance control in critical field, can only be reduced rolling batch
Amount, can not realize production in enormous quantities, simultaneously as the gradient of bulb lateral wall and vertical direction is small, after pass collocation, to repair
Multiple holes type and the roll metal thickness of turning, after general pass collocation, turning 2-3mm can repair pass, the Patent design
Pass is because bulb lateral wall pass is located in horizontal roller, pass collocation direction and vertical direction (horizontal roller turning thickness direction)
Inconsistent, exist needs horizontal roller car 14-25mm thickness just compared with mitre (cotangent 14-25 corresponding to 4%-7%), abrasion 1mm
Pass can be repaired, roll wastes serious.Due to the presence of problem above, the popularization for seriously constraining this symmetry rolling technique should
With.
Publication No. CN105478470A Chinese patent discloses a kind of production technology of flat-bulb steel, belongs to metal rolled
Field, production craft step include：(1) BD1 is rolled；(2) BD2 is rolled；(3) DRDF is rolled；(4) just material cooling；(5) cool down
First material carry out subdivision, aligning.Have steel billet, roll versatility good compared with prior art；Finished product specification limit is big, matter
Measured feature.The invention is approximate with Publication No. CN101190442A Chinese patent, but is connected in two flat-bulb steel webs
There is a depression position, and recess thickness is less than web thickness, so that subdivision is more prone to.There is also pass collocation for the patent
Hurry up, can only small lot production, the problem of roll consumption is big.
The content of the invention
It is an object of the present invention to provide a kind of universal rolling device of flat-bulb steel, can efficiently, stably, low cost
Produce flat-bulb steel.The present invention can roll out axisymmetric combination shape flat-bulb steel, have rolling accuracy high, be obviously improved rolling batch
The characteristics of amount, roll consumption are few.
To reach above-mentioned purpose, the technical solution adopted by the present invention is as follows：
A kind of universal rolling device of flat-bulb steel, the universal rolling device include universal mill unit, universal mill machine
Group is made up of 3-6 frame universal mills, and any frame universal mill has upper horizontal roller 1, lower horizontal roller 2, fore side edger roll 3 and transmission side
Edger roll 4；Chamfering is done at the both ends of lower horizontal roller 2, makes 4 groups of horizontal roller 1, lower horizontal roller 2, fore side edger roll 3 and transmission side edger roll
Combination flat-bulb steel rolling hole is formed after being combined, two flat-bulb steels that are shaped as in the combination flat-bulb steel rolling hole are combined one
The shape risen, the web of two flat-bulb steels are joined together to form compound web plate 6, and bulb is respectively positioned at the same of web that be connected
Side is as left leg 5 and right leg 7.
The left leg 5 is made up of fore side edger roll 3, upper horizontal roller 1 and lower horizontal roller 2.
The compound web plate 6 is made up of upper horizontal roller 1 and lower horizontal roller 2.
The right leg 7 is made up of transmission side edger roll 4, upper horizontal roller 1 and lower horizontal roller 2.
The milling method of universal rolling device based on a kind of above-mentioned flat-bulb steel, the milling method include following step
Suddenly：
Amount to the mobile control of 4 rolls by upper horizontal roller 1, lower horizontal roller 2, fore side edger roll 3 and transmission side edger roll 4
Combine the size at each position of flat-bulb steel.Upper horizontal roller 1 moves down, lower horizontal roller 2 moves up or two act while carry out
The thickness of compound web plate 6 can be reduced.Upper horizontal roller 1 moves up, lower horizontal roller 2 moves down or two action simultaneously progress can
Increase the thickness of compound web plate 6.Fore side edger roll 3 is moved to the left the thickness that can increase left leg 5, and left leg 5 can be reduced by moving right
Thickness.Transmission side edger roll 4, which moves right, can increase the thickness of right leg 7, be moved to the left the thickness that can reduce right leg 7.
The invention has the advantages that the bulb lateral wall for the edger roll processing flat-bulb steel that use can move left and right, works as edger roll
Corresponding position abrasion can make up the abrasion of pass when causing bulb thickening by adjusting edger roll, make ball size control compared with
In accurate scope, without the offline reparation pass of roll, rolling batch can be obviously improved, further, since cinclides on the outside of bulb
Type is located on edger roll, and pass collocation direction is identical with edger roll turning thickness direction, abrasion how much, roll it is offline after turning how much be
Pass can be repaired.To sum up, the present invention provides a kind of flat-bulb steel universal rolling device and technique, can roll out axisymmetric combination
Shape flat-bulb steel, with existing flat-bulb steel production technology ratio, rolling accuracy is high, can be obviously improved rolling batch, and roll consumption is few.
Brief description of the drawings
Fig. 1 is the universal mill roll and pass structure schematic diagram of the present invention；
Reference：1st, upper horizontal roller；2nd, lower horizontal roller；3rd, fore side edger roll；4th, transmission side edger roll；5th, left leg；6th, group
Close web；7th, right leg.
Embodiment
The present invention is described in further details with reference to the accompanying drawings and detailed description.
Embodiment 1：
A kind of universal rolling device of flat-bulb steel, the universal rolling device include universal mill unit, universal mill machine
Group is made up of 3-6 frame universal mills, and any frame universal mill has upper horizontal roller 1, lower horizontal roller 2, fore side edger roll 3 and transmission side
Edger roll 4；Chamfering is done at the both ends of lower horizontal roller 2, makes 4 groups of horizontal roller 1, lower horizontal roller 2, fore side edger roll 3 and transmission side edger roll
Combination flat-bulb steel rolling hole is formed after being combined, two flat-bulb steels that are shaped as in the combination flat-bulb steel rolling hole are combined one
The shape risen, the web of two flat-bulb steels are joined together to form compound web plate 6, and bulb is respectively positioned at the same of web that be connected
Side is as left leg 5 and right leg 7.
Left leg 5 is made up of fore side edger roll 3, upper horizontal roller 1 and lower horizontal roller 2.Compound web plate 6 is by upper horizontal roller 1 with
Horizontal roller 2 forms.Right leg 7 is made up of transmission side edger roll 4, upper horizontal roller 1 and lower horizontal roller 2.A kind of rolling mill practice of flat-bulb steel,
Specially：Amount to the mobile control of 4 rolls by upper horizontal roller 1, lower horizontal roller 2, fore side edger roll 3 and transmission side edger roll 4
The size at each position of flat-bulb steel.Upper horizontal roller 1 moves down, lower horizontal roller 2 moves up or two act while carry out and can subtract
The thickness of small compound web plate 6.Upper horizontal roller 1 moves up, lower horizontal roller 2 moves down or two act while carry out and can increase
The thickness of compound web plate 6.Fore side edger roll 3 is moved to the left the thickness that can increase left leg 5, and the thickness of left leg 5 can be reduced by moving right
Degree.Transmission side edger roll 4, which moves right, can increase the thickness of right leg 7, be moved to the left the thickness that can reduce right leg 7.For example, such as
The bulb outer wear of the left leg 5 of fruit 1mm, the finished product bulb rolled out can be thicker 1mm than standard, and the width of whole flat-bulb steel also can
Wide 1mm, the 1mm that at this moment fore side edger roll 3 need to only be moved right can compensate for the 1mm of abrasion, make bulb thickness and whole ball flat
Steel width controls standard size again, does not have to thus stop rolling, roll of dismantling carries out pass reparation, and can continue to roll
System, after pass collocation causes workpiece measurement to exceed standard again, fore side edger roll 3 is adjusted again and compensates abrasion.According to said method may be used
Rolling batch is brought up to 2-5 times of prior art.The roll thickness that car is gone for reparation pass can also be reduced to prior art
1/14-1/25.
Embodiment 2：
A kind of universal rolling device of flat-bulb steel, the universal rolling device include universal mill unit, universal mill machine
Group is made up of 3-6 frame universal mills, and any frame universal mill has upper horizontal roller 1, lower horizontal roller 2, fore side edger roll 3 and transmission side
Edger roll 4；Chamfering is done at the both ends of lower horizontal roller 2, makes 4 groups of horizontal roller 1, lower horizontal roller 2, fore side edger roll 3 and transmission side edger roll
Combination flat-bulb steel rolling hole is formed after being combined, two flat-bulb steels that are shaped as in the combination flat-bulb steel rolling hole are combined one
The shape risen, the web of two flat-bulb steels are joined together to form compound web plate 6, and bulb is respectively positioned at the same of web that be connected
Side is as left leg 5 and right leg 7.
Left leg 5 is made up of fore side edger roll 3, upper horizontal roller 1 and lower horizontal roller 2.Compound web plate 6 is by upper horizontal roller 1 with
Horizontal roller 2 forms.Right leg 7 is made up of transmission side edger roll 4, upper horizontal roller 1 and lower horizontal roller 2.A kind of rolling mill practice of flat-bulb steel,
Specially：Amount to the mobile control of 4 rolls by upper horizontal roller 1, lower horizontal roller 2, fore side edger roll 3 and transmission side edger roll 4
The size at each position of flat-bulb steel.Upper horizontal roller 1 moves down, lower horizontal roller 2 moves up or two act while carry out and can subtract
The thickness of small compound web plate 6.Upper horizontal roller 1 moves up, lower horizontal roller 2 moves down or two act while carry out and can increase
The thickness of compound web plate 6.Fore side edger roll 3 is moved to the left the thickness that can increase left leg 5, and the thickness of left leg 5 can be reduced by moving right
Degree.Transmission side edger roll 4, which moves right, can increase the thickness of right leg 7, be moved to the left the thickness that can reduce right leg 7.For example, such as
The bulb outer wear of the right leg 7 of fruit 1mm, the finished product bulb rolled out can be thicker 1mm than standard, and the width of whole flat-bulb steel also can
Wide 1mm, at this moment transmission side edger roll 4 need to be only moved to the left the 1mm that 1mm can compensate for abrasion, make bulb thickness and whole ball flat
Steel width controls standard size again, does not have to thus stop rolling, roll of dismantling carries out pass reparation, and can continue to roll
System, after pass collocation causes workpiece measurement to exceed standard again, transmission side edger roll 4 is adjusted again and compensates abrasion.According to said method may be used
Rolling batch is brought up to 2-5 times of prior art.The roll thickness that car is gone for reparation pass can also be reduced to prior art
1/14-1/25.
Embodiment 3：
A kind of universal rolling device of flat-bulb steel, the universal rolling device include universal mill unit, universal mill machine
Group is made up of 3-6 frame universal mills, and any frame universal mill has upper horizontal roller 1, lower horizontal roller 2, fore side edger roll 3 and transmission side
Edger roll 4；Chamfering is done at the both ends of lower horizontal roller 2, makes 4 groups of horizontal roller 1, lower horizontal roller 2, fore side edger roll 3 and transmission side edger roll
Combination flat-bulb steel rolling hole is formed after being combined, two flat-bulb steels that are shaped as in the combination flat-bulb steel rolling hole are combined one
The shape risen, the web of two flat-bulb steels are joined together to form compound web plate 6, and bulb is respectively positioned at the same of web that be connected
Side is as left leg 5 and right leg 7.
Left leg 5 is made up of fore side edger roll 3, upper horizontal roller 1 and lower horizontal roller 2.Compound web plate 6 is by upper horizontal roller 1 with
Horizontal roller 2 forms.Right leg 7 is made up of transmission side edger roll 4, upper horizontal roller 1 and lower horizontal roller 2.A kind of rolling mill practice of flat-bulb steel,
Specially：Amount to the mobile control of 4 rolls by upper horizontal roller 1, lower horizontal roller 2, fore side edger roll 3 and transmission side edger roll 4
The size at each position of flat-bulb steel.Upper horizontal roller 1 moves down, lower horizontal roller 2 moves up or two act while carry out and can subtract
The thickness of small compound web plate 6.Upper horizontal roller 1 moves up, lower horizontal roller 2 moves down or two act while carry out and can increase
The thickness of compound web plate 6.Fore side edger roll 3 is moved to the left the thickness that can increase left leg 5, and the thickness of left leg 5 can be reduced by moving right
Degree.Transmission side edger roll 4, which moves right, can increase the thickness of right leg 7, be moved to the left the thickness that can reduce right leg 7.For example, such as
1mm is all worn on the outside of the bulb of the left leg 5 of fruit and right leg 7, two rolled out finished product bulb can be thicker 1mm than standard, entirely
The width of flat-bulb steel also can wide 2mm, at this moment fore side edger roll 3 need to only be moved right 1mm, transmission side edger roll is moved to the left 1mm
The 1mm that two side holes type each wears is can compensate for, bulb thickness and whole flat-bulb steel width is controlled standard size again, this
Sample does not just have to stop rolling, and roll of dismantling carries out pass reparation, and can continue to roll, when pass collocation causes workpiece measurement again
After standard, fore side edger roll 3 and the compensation abrasion of transmission side edger roll 4 are adjusted again.Rolling batch can according to said method be improved
To 2-5 times of prior art.The roll thickness that car is gone for reparation pass can also be reduced to the 1/14-1/25 of prior art.
In summary, the present invention provides a kind of flat-bulb steel universal rolling device and technique, can roll out axisymmetric group
Shape flat-bulb steel is closed, with existing flat-bulb steel production technology ratio, rolling accuracy is high, can be obviously improved rolling batch, and roll consumption is few.
It should be noted last that the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that the technical side to the present invention
Case is modified or equivalent substitution, and without departure from the spirit and scope of technical solution of the present invention, it all should cover in the present invention
Right among.
Claims (2)
1. a kind of universal rolling device of flat-bulb steel, the universal rolling device includes universal mill unit, universal mill unit
It is made up of 3-6 frame universal mills, any frame universal mill has upper horizontal roller (1), lower horizontal roller (2), fore side edger roll (3) and passed
Move edge-on roller (4)；Characterized in that, chamfering is done at the both ends of lower horizontal roller (2), make horizontal roller (1), lower horizontal roller (2), operation
Edge-on roller (3) and transmission side edger roll (4) form combination flat-bulb steel rolling hole, the combination flat-bulb steel rolling hole after combining
The shape for being shaped as two flat-bulb steels and combining, the web of two flat-bulb steels is joined together to form compound web plate
(6), bulb is respectively positioned at the same side for the web that is connected as left leg (5) and right leg (7).
2. the milling method of the universal rolling device based on a kind of flat-bulb steel described in claim 1, the milling method include
Following steps：
Amount to the movement of 4 rolls by upper horizontal roller (1), lower horizontal roller (2), fore side edger roll (3) and transmission side edger roll (4)
The size at each position of control combination flat-bulb steel；
Upper horizontal roller (1) moves down, lower horizontal roller (2) moves up or two action simultaneously progress can reduce compound web plate
(6) thickness；
Upper horizontal roller (1) moves up, lower horizontal roller (2) moves down or two action simultaneously progress can increase compound web plate
(6) thickness；
Fore side edger roll (3) is moved to the left the thickness that can increase left leg (5), and the thickness of left leg (5) can be reduced by moving right；
Transmission side edger roll (4) moves right and can increase the thickness of right leg (7), is moved to the left the thickness that can reduce right leg (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711120286.7A CN107824613A (en) | 2017-11-14 | 2017-11-14 | The universal rolling device and milling method of a kind of flat-bulb steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711120286.7A CN107824613A (en) | 2017-11-14 | 2017-11-14 | The universal rolling device and milling method of a kind of flat-bulb steel |
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| Publication Number | Publication Date |
|---|---|
| CN107824613A true CN107824613A (en) | 2018-03-23 |
Family
ID=61654380
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711120286.7A Pending CN107824613A (en) | 2017-11-14 | 2017-11-14 | The universal rolling device and milling method of a kind of flat-bulb steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707987A (en) * | 2019-01-30 | 2019-05-03 | 山东钢铁股份有限公司 | New type section joist deformed steel and its production method and process units |
| CN111604371A (en) * | 2019-02-25 | 2020-09-01 | 新疆八一钢铁股份有限公司 | Method for producing high-precision cathode flat steel by universal rolling mill |
| CN112742873A (en) * | 2020-11-30 | 2021-05-04 | 天津市中重科技工程有限公司 | Combined control hole pattern of universal rolling mill |
| CN113941596A (en) * | 2020-07-17 | 2022-01-18 | 北京京诚瑞信长材工程技术有限公司 | Vertical universal mill for die flat steel, flat steel rolling production line and method thereof |
| WO2022227375A1 (en) * | 2021-04-25 | 2022-11-03 | 山东钢铁股份有限公司 | Roll assembly for rolling special-shaped steel and a rolling mill train |
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| CN103386416A (en) * | 2013-07-24 | 2013-11-13 | 钱奕峰 | Method for processing profiled bar with asymmetrical cross section |
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| CN111604371A (en) * | 2019-02-25 | 2020-09-01 | 新疆八一钢铁股份有限公司 | Method for producing high-precision cathode flat steel by universal rolling mill |
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| CN112742873A (en) * | 2020-11-30 | 2021-05-04 | 天津市中重科技工程有限公司 | Combined control hole pattern of universal rolling mill |
| WO2022227375A1 (en) * | 2021-04-25 | 2022-11-03 | 山东钢铁股份有限公司 | Roll assembly for rolling special-shaped steel and a rolling mill train |
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