CN107790492A - A kind of production technology of elastic flat-bulb steel - Google Patents
A kind of production technology of elastic flat-bulb steel Download PDFInfo
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- CN107790492A CN107790492A CN201711047741.5A CN201711047741A CN107790492A CN 107790492 A CN107790492 A CN 107790492A CN 201711047741 A CN201711047741 A CN 201711047741A CN 107790492 A CN107790492 A CN 107790492A
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- bulb steel
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- 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
- B21B1/12—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 continuous process, i.e. without reversing stands
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- 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
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Abstract
The invention discloses a kind of production technology of elastic flat-bulb steel, belong to metal rolled field, production craft step includes：(1) BD1 is rolled；(2) BD2 is rolled；(3) DRDF is rolled；(4) just material cooling；(5) the first material cooled down carries out subdivision, aligning.Have steel embryo, roll versatility good compared with prior art；The characteristics of finished product specification limit is big, quality is good.
Description
Technical field
The present invention is application for a patent for invention《A kind of production technology of flat-bulb steel》(application number：2015109033823) point
Case application, it is related to a kind of steel manufacturing process, particularly a kind of rolling mill practice suitable for flat-bulb steel.
Background technology
Flat-bulb steel is one kind of special sections, is mainly used in shipbuilding and bridging, but at full speed with shipbuilding industry in recent years
Development, flat-bulb steel is increasingly becoming the special title of Flat-bulb Steel for Ship Use, is most important one kind in shipbuilding section, mainly as adding for the deck of boat
Strengthening tendons uses, equivalent to " rib " of people.Flat-bulb steel is made up of flat web and spherical bulb, is asymmetric shaped steel,
Single branch rolling is commonly used under prior art, i.e., according to mill load and lengthening coefficient, is directly depressed.Its specific production technology
Step is steel billet → heating → one-strand roller → aligning.Due to single branch operation of rolling deform it is asymmetric, web and bulb ratio compared with
Greatly, bending is easily caused after cold bed cooling, so as to influence whether product quality.And prior art pair rolling causes to width side
To unrestricted spread is carried out, rolled piece extension is big, spreads small.
Application No. 200610134469.X patent of invention《A kind of production technology of flat-bulb steel》In disclose it is a kind of right
Claim the production technology of rolling, its step is：Steel billet → heating → symmetry rolling → straightening processing → subdivision, each passage pass of milling train
It is made up of two symmetry equivalent flat-bulb steel passes.Deformation in the single branch operation of rolling of the process improving is asymmetric, but still deposits
In following defect：1. special grooving of roll is needed, and the special pass such as finished hole, leader pass, it is impossible to using normal
Steel embryo, roll are advised, causes special computer for special use, deficiency in economic performance, and it is of single specification；2. technical requirements are disposably pressed into, by milling train
Mill load and lengthening coefficient limitation, so as to produce the rolled piece of big specification, single branch is still needed to for the flat-bulb steel of super large-scale
Rolling；3. two flat-bulb steel intermediate connections thickness of symmetry rolling are larger, difficulty, therefore the case are brought to next procedure subdivision
What is used earnestly divides, and earnestly divides and have an impact for cross-section structure, and product end quality is defective；It is 4. flat for the ball of every kind of specification
Steel needs a kind of individually designed steel billet of specification, it is impossible to realizes that blank is public.
The content of the invention
The technical assignment of the present invention is to be directed to above the deficiencies in the prior art, there is provided a kind of production work of elastic flat-bulb steel
Skill, the flat-bulb steel of the high quality of big specification can be produced.
The present invention solve its technical problem technical scheme be：A kind of production technology of elastic flat-bulb steel, it is characterised in that
Production craft step includes：
(1) first blooming mill rolls：Rectangular bloom is spreaded as flat blank through first blooming mill；Its process of spreading is：
Twice groove is extruded first on rectangular bloom, then the boss between twice groove is flattened；
(2) second frame blooming mills roll：Through the second frame blooming mill by first blooming mill in step (1) obtained by flat blank
Symmetrical material type is rolled into, described material type includes the plate portion of the thick end in both ends and intermediate thin；Waveform is presented in plate portion；BD2 rolls
" waveform " material type temperature is 940 DEG C~1010 DEG C after system, and then material type cools through water curtain, temperature is down to 700 DEG C~750
DEG C, and continue to carry out D in the temperature rangeRDFRolling；
(3) two frame tandem two-roller mills roll：As obtained by two frame tandem two-roller mills the second frame blooming mill
Material type rolls into just material, and described first material includes the flat-bulb steel that two symmetrical webs are connected, the symmetrical flat-bulb steel abdomen of two of which
There is a depression plate junction, and recess thickness is less than the thickness at flat-bulb steel web, and angle is small on two symmetrical flat-bulb steel webs
In 180 °；
(4) just material enters cold bed strong wind cooling；
(5) the first material cooled down carries out subdivision, aligning.
Above-mentioned first blooming mill rolling includes 7 passages：1st passage, two are extruded respectively in rectangular bloom upper and lower surface
Road groove；2nd passage, the boss between described twice groove is flattened；3rd passage, by described twice groove both sides
Boss flattens；4th passage, one of groove is extruded respectively in the centre of rectangular bloom upper and lower surface；5th passage, by described groove
Both sides boss pressure；6th passage, is rotated by 90 °, and carries out edging；7th passage, is rotated by 90 °, and spreads again.
The waveform that above-mentioned plate portion is presented is discontinuous sine curve, is made up of four crests and three troughs：It is described
Four crests include two big crest and two small crests, described two big crest is located at plate portion midpoint both sides, two big
Small trough is formed between crest, the lowest point of the small trough is plate portion midpoint；Two described small echo peaks are located at end and plate portion
Joint, it is big trough between the small crest and big crest of the homonymy.
The first material of above-mentioned two frame tandem two-roller mills rolling, two flat-bulb steel web junction thickness are 3mm, per side
Flat-bulb steel web and horizontal line angle are 3 °.
In above-mentioned steps (5), subdivision aligning is carried out using aligning Unit erriger.
Above-mentioned aligning Unit erriger includes straightener and the disc type cutting equipment in front of it.
Compared with prior art, the present invention has beneficial effect following prominent：
1st, steel embryo, roll versatility are good；
2nd, same equipment can produce the flat-bulb steel of bigger specification；
3rd, subdivision is easy, the preferable surface quality of split surface, and realizes that on-line continuous is turned into industry, efficiency high；
4th, absolute spread using conventional spreading than that can have more 30%；
5th, flat-bulb steel has good elasticity.
Brief description of the drawings
Fig. 1 is the BD1 operation of rolling schematic diagrames of the embodiment of the present invention 1.
Fig. 2 is the embodiment of the present invention 1 through BD2, DRDFOperation of rolling schematic diagram.
Fig. 3 is BD2 rollings gained material template portion schematic cross-section of the present invention.
Fig. 4 is the cold bed mill construction schematic diagram that the embodiment of the present invention 2 uses.
Embodiment
With reference to specification drawings and specific embodiments, the present invention is further described.
Embodiment 1, the present embodiment production technology are：Rectangular bloom → heating → BD1 rollings → BD2 rollings → DRDFRolling →
Cold bed natural cooling → cold cut divides straightening processing.
Comprise the following steps that：
(1) as shown in figure 1, spreading rectangular bloom for flat blank through first blooming mill (BD1), it spreads process as first
Twice groove is extruded on rectangular bloom, then the boss between twice groove is flattened.Rolled by subregion, reduce rolled piece extension,
Increase is spreaded, and such absolute spread can use less power to make rectangle than that can have more 30% using conventional spreading
Base fully spreads, and is adapted to the rectangular bloom for spreading big specification.
BD1 rollings specifically include 7 passages：1st passage, twice groove is extruded respectively in rectangular bloom upper and lower surface；2nd
It is secondary, the boss between described twice groove is flattened；3rd passage, the boss of described twice groove both sides is flattened；4th
Passage, one of groove is extruded respectively in the centre of rectangular bloom upper and lower surface；5th passage, by described groove both sides boss pressure；
6th passage, is rotated by 90 °, and carries out edging；7th passage, is rotated by 90 °, and spreads again.So absolute spread is than using the wide of routine
Exhibition can have more 30%.
(2) as shown in Fig. 2 1~4 step, the flat blank obtained by BD1 is rolled into symmetrical material through the second frame blooming mill (BD2)
Type, the material type both ends are thick, intermediate thin.The thick end in both ends is to form " bulb " of flat-bulb steel, and the plate portion of intermediate thin is to shape
Into " web " of flat-bulb steel." waveform " is presented in middle plate portion, as shown in figure 3, bilateral is presented with midpoint in described waveform
It is symmetrical.For the ease of narration, with the upper and lower for narration direction of Fig. 3, in prioritization scheme, described " waveform " section is non-
Continuous sine curve, it is made up of four crests and three troughs：Four described crests include two big crest 2 and two small echos
Peak 1, described two big crest 2 are located at plate portion midpoint both sides, small trough 4, the small trough 4 are formed between two big crest 2
The lowest point be plate portion midpoint；Described two small crest 1 is located at end and plate portion joint, the small crest 1 of the homonymy and big
It is big trough 3 between crest 2, above curve waveform design sense is poor using radian so that in DRDFIn the operation of rolling everywhere
Extension ratio is equal, and so as to ensure flat-bulb steel web, mechanical property is equal everywhere.
(3) as shown in Fig. 2 5~8 steps, two frame tandem two-roller mill (DRDF) " waveform " material type is rolled into and just expected, institute
The first material stated includes the flat-bulb steel that is connected of two symmetrical webs, and the symmetrical flat-bulb steel web junction of two of which has one recessed
Fall into, recess thickness is less than the thickness at flat-bulb steel web, and angle is less than 180 ° on two symmetrical flat-bulb steel webs.What it was recessed
Being formed to be：The boss to match with the depression is processed among the finished product lower roll groove of this milling train, passes through the boss
Shut out the sunk part of junction, or any hole type design that can be completed its depression and be formed.Ball is flat in prioritization scheme
Steel web junction thickness is 3mm, and per side flat-bulb steel web and horizontal line angle is 3 °.Flat-bulb steel is enable by sunk structure
It is easier to split, and ensures split surface quality.
(4) just expect through cold bed natural cooling.
(5) the first material cooled down carries out subdivision, aligning.The step, can also be straight respectively using subdivision, aligning machinery
Tapping into and align Unit erriger into subdivision, described aligning Unit erriger includes straightener and the disc type cutting equipment in front of it,
Rolled piece opens the junction cutting of two flat-bulb steels during traveling, and the preferable surface quality of split surface can be achieved, and in fact
Present line continuous operations, efficiency high.
The technology of the present invention, make rectangular bloom local pressure by the way of belling platform and waveform roll again using first pressing groove, compared with
Small pressure can be such that rectangular bloom fully spreads, i.e., the bigger rectangular bloom of specification can be spreaded under same pressure；Using " ripple
The rolling mode of shape wave " makes rectangular bloom have less size before being fully deployed, so as to so that the blooming mill of certain specification
Larger sized flat-bulb steel is produced, it is achieved thereby that can produces the flat-bulb steel of big specification under conditions of machine is changed without.
It is poor using radian that described " waveform " section takes discontinuous sine curve curve waveform design sense to be so that in DRDF
It is equal to extend ratio in the operation of rolling everywhere, mechanical property is equal everywhere so as to ensure flat-bulb steel web.
Embodiment 2, the present embodiment production technology are：Rectangular bloom → heating → BD1 rollings → BD2 rollings → DRDFRolling →
Cold bed strong wind cooling → cold cut divides straightening processing.In addition to " cold bed strong wind cooling ", other techniques are with embodiment one, in the present embodiment
In be not repeated.
Specific cold bed strong wind cooling process is DRDFJust material is cooled down gained into cold bed factory building 12 in rolling, described
Cold bed factory building 12 as shown in figure 4, including cold bed 6, foundation ditch, ventilator 14 and strong air-cooler 5, the cold bed entrance of cold bed factory building 12
11 and cold bed outlet 7 at be respectively equipped with entrance foundation ditch 8 and outlet foundation ditch 9, entrance foundation ditch 8 and outlet foundation ditch 9 stretch out cold bed factory
Outside room 12, the described length of entrance foundation ditch 8, depth are respectively smaller than outlet foundation ditch 9.Entrance foundation ditch 8 and outlet foundation ditch 9 and cold bed 6
Lower section foundation ditch 13 communicates, and stepped, lower rank and the level of outlet foundation ditch 9, upper rank and the level of entrance foundation ditch 8 is presented in foundation ditch 13, and cold
Have multiple pillars in 6 time foundation ditches 13 of bed, three after cold bed 6/foundation ditch 13 of a part in installation transverse direction turn back blend stop.It is described
The top of cold bed factory building 12 is provided with ventilator 14, and the lower section of cold bed 6 is provided with strong air-cooler 5, and strong air-cooler 5 is arranged on cold bed 6
In after 1/3rd intersections, the strong air-out direction of air-cooler 5 is towards entering steel direction, in order to by cold wind caused by strong air-cooler 5
The top portion ventilation device 14 of described cold bed factory building 12 is blowed to, and is guided with this at air flow direction ventilator 14 in the whole area of cold bed 6.
Flat-bulb steel in this step is just expected directly to be down to 80 DEG C by 950 DEG C in cooling procedure, can at the uniform velocity advanced, without cold stage by stage
But.Using both ends design of foundation pit and ladder air cooling technology, air enters cold bed 6 by the foundation ditch at the both ends of cold bed factory building 12：Entrance
The air of foundation ditch 8 enters naturally carries out basic cooling, and cold air heat absorption rises, and is excluded by the top ventilator 14 of cold bed 6, constantly inhaled
Draw cold wind from foundation ditch to enter；Entrance foundation ditch 8 compares shallower, and internal to be turned back design without pillar and bottom surface, its reason is entrance
Locate the temperature highest of steel, air needs to take away heat rapidly, but the section again can not be excessively strong cold, and initial cooldown rate is too high
Then Wei Shi bodies tissue and bainite structure are largely formed, and influence steel product performance.1/3rd pass through strong air-cooler in cold bed 6
5 realize air blast cooling, and the angle between the air outlet and ventilator 14 of strong air-cooler 5 is 15 °~20 °, and the angle considers
The ascension of hot-air, it is ensured that high efficiency flow, and repeatedly turned back by pillar and bottom grooves, increase cooling effect, heat
Efficiency is exchanged, the rear that fully exchanges heat escapes from ventilator 14；The purpose of the step-like design of foundation ditch 13 lies also in reduction air blast cooling
Influence for 1/3rd gentle air coolings before cold bed 6, reduces Wei Shi bodies tissue and bainite structure is formed.Three points after cold bed 6
One of air enter from deep, long outlet foundation ditch 9, foundation ditch posterior transversal is turned back design, the steel for having carried out cold cooling by force
Carry out reducing temperature twice.Using the above-mentioned air-cooled Compound cooling of this kind of air cooling, (average cooling rate is by common air-cooled for cooling velocity lifting
14.5 DEG C/min of cold bed rises to 22.5 DEG C/min), and the poker temperature difference of cold bed is less than 10 DEG C under steel, so as to ensure that
While cooldown rate is increased, cooling uniformity is ensure that, while also solves super large-scale model flat-bulb steel web because cold
Deformation caused by uneven and deadweight and cooling wave problem, and to cool down too fast Wei Shi bodies tissue and bainite structure early stage big
Amount formed and caused by finished product intensity difference the problem of.
The above-mentioned type of cooling accelerates the cooling velocity of cold bed, at the same also solve super large-scale model flat-bulb steel web because
Deformation caused by inhomogeneous cooling and deadweight and cooling wave problem.
Embodiment 3, the present embodiment are that temperature-controlled rolling is carried out on the basis of embodiment 1, and production technology is：Rectangular bloom → add
Heat → BD1 rollings → BD2 rollings → temperature control processing → DRDFRolling → cooling → cold cut divides straightening processing.Temperature control processing therein
Specially：" waveform " material type temperature is 940 DEG C~1010 DEG C after BD2 rollings, and then material type cools through water curtain, be down to temperature
700 DEG C~750 DEG C, and continue to carry out D in the temperature rangeRDFRolling.Its object is to make flat-bulb steel increase elasticity.
Embodiment 4, the present embodiment are that Technology for Heating Processing is carried out on the basis of embodiment 1, and production technology is：Rectangular bloom →
Heating → BD1 rollings → BD2 rollings → heat treatment → DRDFRolling → cooling → cold cut divides straightening processing.Described is heat treated
Journey is specially：Between " waveform " material type temperature is 940 DEG C~1010 DEG C after BD2 rollings, material type is immersed strong in hardening media
It is cooled to 360 DEG C~410 DEG C, and with the temperature 30 minutes, is then heated to 680 DEG C~700 DEG C, is incubated 30 minutes, afterwards
Into DRDFRolling process, DRDFRolling temperature is not higher than 900 DEG C.Flat-bulb steel further improves its elasticity after Overheating Treatment
Energy, the naval vessel of particular/special requirement, the hull such as easily hit by floating ice or the warship easily attacked by shell, torpedo are more suitable for,
Instantaneous impact can be sponged by way of elastic deformation, plays cushioning effect, prevents hull to be damaged, avoids the perils of the sea
Generation.
It should be noted that the present invention particular to the present invention have been described in detail, for ability
For the technical staff in domain, its various of progress is obviously changed without departing from the spirit and scope of the present invention
Become all within protection scope of the present invention.
Claims (6)
1. a kind of production technology of elastic flat-bulb steel, it is characterised in that production craft step includes：
(1) first blooming mill rolls：Rectangular bloom is spreaded as flat blank through first blooming mill；Its process of spreading is：First
Twice groove is extruded on rectangular bloom, then the boss between twice groove is flattened；
(2) second frame blooming mills roll：The flat blank obtained by first blooming mill in step (1) is rolled into through the second frame blooming mill
Symmetrical material type, described material type include the plate portion of the thick end in both ends and intermediate thin；Waveform is presented in plate portion；After BD2 rollings
" waveform " material type temperature is 940 DEG C~1010 DEG C, then material type cools through water curtain, temperature is down to 700 DEG C~750 DEG C, and
Continue to carry out two frame tandem two-roller mills rolling (D in the temperature rangeRDF)；
(3) two frame tandem two-roller mills roll：Material type as obtained by two frame tandem two-roller mills the second frame blooming mill
Just material is rolled into, described first material includes the flat-bulb steel that two symmetrical webs are connected, and the symmetrical flat-bulb steel web of two of which connects
There is a depression at the place of connecing, and recess thickness is less than the thickness at flat-bulb steel web, and angle is less than on two symmetrical flat-bulb steel webs
180°；
(4) just material enters cold bed strong wind cooling；
(5) the first material cooled down carries out subdivision, aligning.
A kind of 2. production technology of elastic flat-bulb steel according to claim 1, it is characterised in that：Described first cogging
Machine rolling includes 7 passages：1st passage, twice groove is extruded respectively in rectangular bloom upper and lower surface；2nd passage, by described two
Boss between road groove flattens；3rd passage, the boss of described twice groove both sides is flattened；4th passage, in rectangular bloom
The centre of upper and lower surface extrudes one of groove respectively；5th passage, by described groove both sides boss pressure；6th passage, rotation
90 degree, carry out edging；7th passage, is rotated by 90 °, and spreads again.
A kind of 3. production technology of elastic flat-bulb steel according to claim 1, it is characterised in that：What described plate portion was presented
Waveform is discontinuous sine curve, is made up of four crests and three troughs：Four described crests include two big crests
With two small crests, described two big crest is located at plate portion midpoint both sides, small trough is formed between two big crest, described small
The lowest point of trough is plate portion midpoint；Two described small echo peaks are located at end and plate portion joint, the small crest of the homonymy and
It is big trough between big crest.
A kind of 4. production technology of elastic flat-bulb steel according to claim 1, it is characterised in that：Two described frame tandems
The first material of two-roller mill rolling, two flat-bulb steel web junction thickness are 3mm, are with horizontal line angle per side flat-bulb steel web
3°。
A kind of 5. production technology of elastic flat-bulb steel according to claim 1, it is characterised in that：In the step (5), make
Subdivision aligning is carried out with aligning Unit erriger.
A kind of 6. production technology of elastic flat-bulb steel according to claim 5, it is characterised in that：Described aligning combination machine
Group includes straightener and the disc type cutting equipment in front of it.
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| CN201711047741.5A CN107790492B (en) | 2015-12-09 | 2015-12-09 | A kind of production technology of elasticity flat-bulb steel |
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| CN201711047741.5A CN107790492B (en) | 2015-12-09 | 2015-12-09 | A kind of production technology of elasticity flat-bulb steel |
| CN201510903382.3A CN105478470B (en) | 2015-12-09 | 2015-12-09 | A kind of production technology of flat-bulb steel |
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| CN201510903382.3A Active CN105478470B (en) | 2015-12-09 | 2015-12-09 | A kind of production technology of flat-bulb steel |
| CN201711047709.7A Active CN107537856B (en) | 2015-12-09 | 2015-12-09 | A kind of production technology of high strength flat-bulb steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108421839A (en) * | 2018-05-28 | 2018-08-21 | 山西太钢不锈钢股份有限公司 | A kind of flat-bulb steel diplopore model extrusion method |
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| CN107570547A (en) * | 2017-07-27 | 2018-01-12 | 宿迁南钢金鑫轧钢有限公司 | A kind of Flat-bulb Steel for Ship Use production technology |
| CN108787742A (en) * | 2018-07-06 | 2018-11-13 | 鞍钢股份有限公司 | A kind of middle-size and small-size milling method for making Flat-bulb Steel for Ship Use |
| CN109261714B (en) * | 2018-09-05 | 2020-04-24 | 鞍钢股份有限公司 | Rolling method of symmetrical flat-bulb steel for large shipbuilding |
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| JPS58141801A (en) * | 1982-02-19 | 1983-08-23 | Nippon Steel Corp | Production of shape steel having high toughness as rolled |
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| DE3602301A1 (en) * | 1985-05-06 | 1986-11-06 | SKET Schwermaschinenbau Magdeburg GmbH i.K., 39112 Magdeburg | Installation for the additional ventilation of cooling beds |
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| CN101214599A (en) * | 2008-01-14 | 2008-07-09 | 扬州诚德钢管有限公司 | Bulb steel production technique |
| CN101229564A (en) * | 2008-02-26 | 2008-07-30 | 重庆钢铁(集团)有限责任公司 | Manufacturing method of increasing high strength flat-bulb steel low temperature impact properties percent of pass |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108421839A (en) * | 2018-05-28 | 2018-08-21 | 山西太钢不锈钢股份有限公司 | A kind of flat-bulb steel diplopore model extrusion method |
| CN108421839B (en) * | 2018-05-28 | 2019-07-05 | 山西太钢不锈钢股份有限公司 | A kind of flat-bulb steel diplopore model extrusion method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105478470B (en) | 2017-12-08 |
| CN107537856A (en) | 2018-01-05 |
| CN107537856B (en) | 2019-05-03 |
| CN105478470A (en) | 2016-04-13 |
| CN107790492B (en) | 2019-02-15 |
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