CN102159335B - Cooling device in t-bar hot-rolling line, and t-bar manufacturing facility and manufacturing method - Google Patents

Cooling device in t-bar hot-rolling line, and t-bar manufacturing facility and manufacturing method Download PDF

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Publication number
CN102159335B
CN102159335B CN200980136813.0A CN200980136813A CN102159335B CN 102159335 B CN102159335 B CN 102159335B CN 200980136813 A CN200980136813 A CN 200980136813A CN 102159335 B CN102159335 B CN 102159335B
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mentioned
flange
web
steel
rolling
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CN102159335A (en
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高岛由纪雄
高桥英树
山口阳一郎
中田直树
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JFE Steel Corp
JFE Engineering Corp
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NKK Corp
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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
    • B21B1/092—T-sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B2045/0221—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for structural sections, e.g. H-beams

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

A cooling device (8) in a T-bar hot-rolling line is capable of minimizing camber due to cooling, which is caused by the temperature difference between a flange and a web, and the cooling device is provided with an outer surface water-cooling nozzle (8a) for cooling the flange outer surface of a material to be rolled (H) comprising approximately T-shaped cross-sectional web (21) and flange (22) by water cooling, and/or an inner surface water-cooling nozzle for cooling the flange inner surface of the material to be rolled by water cooling. The outer surface water-cooling nozzle and/or the inner surface water-cooling nozzle are/is provided in the position and direction where the nozzle(s) can inject water toward the outer surface and/or the inner surface of the flange in any inclined state of the web of the material to be rolled when the web is inclined from the state in which the web is approximately horizontal to a roller table (13) for carrying the material to be rolled to the state in which the tip of the web and the lower end of the flange are on the same level.

Description

The cooling device of T-steel hot rolling line, the manufacturing equipment of T-steel and manufacture method
Technical field
Cooling device, manufacturing equipment and manufacture method while the present invention relates to manufacture T-steel (T-bar) by hot rolling.
Background technology
Figure 11 represents the cross sectional shape of T-steel.T-steel 20 is by the shaped steel of the cross section T word shape of web (web) 21 and flange (flange) 22 formations, is widely used in the field such as shipbuilding, bridge.T-steel produces the finished product of various sizes according to its purposes, service condition, use position etc.Normally used T-steel 20 is of a size of web height: 200～1000mm left and right, web thickness: 8～25mm left and right, web inside dimensions: 190～980mm left and right, flange width: 80～400mm left and right, thickness of flange: 12～40mm left and right.And, in the case of the T-steel 20 for shipbuilding, be mostly that web height is the more than 2 times of flange width.
In general, T-steel 20 forms by web 21 and flange 22 being welded manufacture, but also discloses the technology integrally formed by hot rolling.
For example, following technology is disclosed: in order to produce by hot rolling the T-steel that web thickness, thickness of flange, web height and flange width are various sizes efficiently, thereby configure respectively 1 universal mill (universal mill) (for example,, with reference to patent documentation 1) in intermediate rolling operation and finish rolling operation.Figure 12 represents an example of equipment of hot rolling.
This equipment of hot rolling 101 comprises: thick moulding milling train 102, to carrying out reciprocal rolling and roughly T font of thick moulding cross section from the former material steel billet of heating furnace (not shown) output; Intermediate mill group 103, is shaped to the roughly T-steel of finished size by be slightly molded into the roughly T-steel base (with reference to Figure 14) of T word shape by this thick moulding milling train 102; Universal finishing mill 106, will be shaped to the T-steel of finished size roughly and be shaped to the T-steel of finished size.Intermediate mill group 103 comprises universal roughing mill 104 and is arranged on the edging mill (edger mill) 105 in the downstream of universal roughing mill 104.
The rolling process being undertaken by thick moulding milling train 102 is thick moulding rolling process, and Figure 13 (A) schematically shows the structure of thick moulding milling train 102.Thick moulding milling train 102 comprises the top roll 102a and the lower roll 102b that form 3 groups of passes.And thick moulding milling train 102 is at the described pass former material steel billet of rolling in turn, obtain shown in Figure 14 formed by web 21 and flange 22 be rolled material (T-steel base) H.
And, be intermediate rolling operation by forming the universal roughing mill 104 of intermediate mill group 103 and rolling process that edging mill 105 carries out, Figure 13 (B) schematically shows the structure of universal roughing mill 104, and Figure 13 (C) schematically shows the structure of edging mill 105.As shown in Figure 13 (B), universal roughing mill 104 comprises a pair of horizontal roller (horizontal roll) 141a, 141b, an opposite roller (vertical roll) 142a, 142b.As shown in Figure 13 (C), edging mill 105 comprises a pair roller 151a, the 151b respectively with large footpath roller portion 153 and path roller portion 154.Be rolled material (T-steel base) H for what obtain in thick moulding rolling process, the universal roughing mill 104 and the edging mill 105 that are arranged on the intermediate mill group 103 in the downstream of thick moulding milling train 102 by formation reduce the thickness of web 21 and flange 22, and become controlled material (the roughly T-steel of the finished size) H that is rolled of flange width of flange 22.Now, even if do not adjust more roll change by the roller aperture to horizontal roller 141a, 141b (ro1l gap), also can be adjusted into various web thickness, in addition, can be adjusted into various thickness of flange by the roller aperture of adjusting edger roll 142a.And the interval of 154 of minor diameter parts that can be by adjusting a pair of edger roll 151a, 151b is adjusted flange width.
And the rolling process being undertaken by universal finishing mill 106 is finish rolling operation, Figure 13 (D) schematically shows the structure of universal finishing mill.As shown in Figure 13 (D), universal finishing mill 106 comprises a pair of horizontal roller 161a, 161b and an opposite roller 162a, 162b.And, be rolled material H for what obtain in intermediate rolling operation, utilize universal finishing mill 106 that flange 22 is vertically erected, thereby become finished product cross sectional shape.
But, in the T-steel 20 of hot rolling, as shown in figure 15, in its cooling procedure, exist a side of flange 22 to produce as the problem of the bending of concavity (camber).For this problem, patent documentation 1 also proposes (the 2nd page of left hurdle fifth line～fourth from the last reciprocal is capable) to some extent, in the manufacture method of the T-steel of recording at patent documentation 1, as its countermeasure, following scheme is disclosed: when high temperature in the rolling of T-steel or after finish rolling, for example to (there is no a side of the web) water filling of flange outer surface, flange is carried out coolingly, when keeping the temperature difference of minimum axostylus axostyle (web) and flange, T-steel is carried out to cooling (fifth line～3rd reciprocal, the 2nd page of right hurdle page left hurdle the first row) as far as possible.And, in patent documentation 2, following technology is disclosed: carry to length direction towards the posture of general horizontal direction with web finishing the T-steel of hot rolling, and the outer surface of flange to this T-steel or the inner surface of flange (having a side of web) and outer surface carry out water-cooled.
Patent documentation 1: Japanese Patent Publication 43-19671 communique
Patent documentation 2: TOHKEMY 2008-126259 communique
But in the manufacture method of the known T-steel in the past of recording at described patent documentation 1 and 2, there are the following problems.
; in the manufacture method of the T-steel described in patent documentation 1; in the process of cooling T-steel, there is the bending countermeasure to flange side as solving; when high temperature in the rolling of T-steel or after finish rolling; for example to the water filling of flange outer surface, flange is carried out cooling, but do not have record specifically manufacture T-steel manufacturing equipment where flange is carried out to the cooling bending that could effectively prevent the cooling T-steel causing.
And in patent documentation 2, the flange that discloses the T-steel to the hot rolling that is through with by water-cooled carries out the technology of cooling (carrying out water cooling), but according to present inventor's research, in this method described in this patent documentation 2, there are the following problems.
That is, carry out when cooling finishing the flange of the T-steel after hot rolling by water-cooled, because the flange of T-steel shrinks because of water-cooled, thereby in cooling and firm cooled T-steel there is the bending (flange side is the bending of concavity) to flange side.The temperature difference of flange and web is finishing to reach 100 DEG C of left and right or higher when hot rolling, if will be by the cooling bending that prevents finished product to eliminate the temperature difference after hot rolling of flange, needs to carry out powerful cooling.Its result, becomes excessive and likely causes T-steel to depart from the problem of rolling line to the bending of flange side.
And, the in the situation that of T-steel, even owing to carrying out cooling by water-cooled to flange, also because the contraction of flange occurs to the bending of flange side, thereby after carrying out hot rolling with the shaped steel left and right sides at web as H shaped steel to flange, flange is carried out compared with the situation of water-cooled, have that thermal deformation remission effect is little, the little problem of the cooling detorsion effect causing of flange itself.The flange of H shaped steel is carried out in the situation of water-cooled, as long as the thermal contraction of left and right flange is even, just can not bend at H shaped steel, by compression stress act on web, tensile stress acts on flange, utilize and relax these stress in the stress relieve effect that between heat or between temperature, region causes, obtain and alleviate the effect that is cooled to the residual stress producing at shaped steel after room temperature.But, as T-steel, flange is only present in the one-sided shaped steel of web, even because flange is carried out to water-cooled contraction, also can occur to the bending of flange side, thereby the stress producing at web, flange and flange are present in compared with the shaped steel of both sides of web, become small level, can not fully obtain stress relieve effect.Its result, the amount of bow that is cooled to the T-steel after room temperature is compared the situation of not carrying out water-cooled and is not almost improved.
Then, in patent documentation 2, need to carry T-steel towards the posture of general horizontal direction to length direction with the web of T-steel, if but carry out cooling owing to will keeping web flange to be only present in to one-sided T-steel towards the posture of general horizontal direction time, the mechanism of supporting web front end just need to be set, thereby the problem that exists cost of equipment to improve.In order to carry out the cooling cooling device that just need to extend fully, the expense of web support mechanism also uprises along with cooling device is elongated.
And also there are the following problems in the technology described in patent documentation 1 and 2.
; the material of the T-steel of manufacturing in hot rolling mode is not only general mild steel, for example also needs to reach more than 325MPa high tension steel, i.e. so-called high strength steel material (high tensile strength steel) in the T-steel of the hull construction for shipbuilding yield stress.As the method for T-steel of manufacturing this high strength steel, the temperature that make to be rolled material that are suitable in non-recrystallization region (non-recrystallization temperature), two-phase region (austenite and ferrite two-phase region) and the controlled rolling (controlled rolling) that is rolled needs the rolling under low temperature compared with general mild steel more.In order to carry out zerolling, for example exist and before intermediate rolling, make to be rolled material standby and carry out air cooling until the temperature of flange becomes the method below set point of temperature, but exist in air cooling longlyer for being cooled to time of set point of temperature, rolling time is increased and reduce productive problem.And, because the web thickness of the T-steel in rolling is in general thinner than thickness of flange, thereby the cooling velocity of web is faster than flange, the temperature difference at standby flange and web expands, thereby cause producing and prevent cooling bending reverse effect, and existence allows to guarantee that material also causes bending large must being difficult to be corrected after cooling.
Summary of the invention
For above-mentioned reasons, in the manufacture method of the T-steel of the hot rolling based in the past, can not solve the problem of the cooling bending occurring because of the temperature difference of flange and web, and hinder and manufacture T-steel by hot rolling.Thus, the present invention makes in order to address the above problem, and its object is to provide a kind of manufacturing equipment and manufacture method of T-steel of hot rolling based on can reduce the cooling bending occurring because of the temperature difference of flange and web as far as possible.
Take to achieve these goals following structure.
(1) a kind of cooling device of T-steel hot rolling line, it is characterized in that, any one is set in outer surface water-cooled nozzle and inner surface water-cooled nozzle at least on the hot rolling line of T-steel, described outer surface water-cooled nozzle by water-cooled pair cross-section roughly the flange outer surface that is rolled material being formed by web and flange of T font carry out cooling, described inner surface water-cooled nozzle is carried out cooling by water-cooled to the above-mentioned flange inner surface that is rolled material, in above-mentioned outer surface water-cooled nozzle and above-mentioned inner surface water-cooled nozzle at least any one be arranged on position as described below and towards, at the above-mentioned above-mentioned web that is rolled material from when carrying this state that is rolled the upper surface approximate horizontal of the roller-way of material to tilt to the front end of above-mentioned web and state that above-mentioned flange lower end is equal height, no matter under any heeling condition of above-mentioned web, all can be at least any one party water filling in the outer surface of above-mentioned flange and inner surface.
(2) according to the cooling device of the T-steel hot rolling line above-mentioned (1) Suo Shu, it is characterized in that, the above-mentioned above-mentioned flange inner surface that is rolled material is carried out to cooling inner surface water-cooled nozzle to be comprised: upper flange inner surface water-cooled nozzle, carry out cooling to the upper flange inner surface of above-mentioned web upside; And lower flange inner surface water-cooled nozzle, lower flange inner surface to above-mentioned web downside carries out cooling, if the jet angle of above-mentioned upper flange inner surface water-cooled nozzle is the α angle downward with respect to the upper surface of above-mentioned roller-way, if the jet angle of above-mentioned lower flange inner surface water-cooled nozzle is with respect to the upper surface of above-mentioned roller-way β angle upwards, the jet angle β of above-mentioned lower flange inner surface water-cooled nozzle is set as being greater than to the jet angle α (α < β) of upper flange inner surface water-cooled nozzle.
(3) manufacturing equipment for T-steel, is the manufacturing equipment of hot roll T shaped steel, comprising: thick moulding milling train, for the former material rough rolling of steel billets transporting from heating furnace is become cross section roughly T font, formed by web and flange be rolled material; Intermediate mill group, be arranged on the back segment of thick moulding milling train, for by the cross section being become by above-mentioned thick moulding milling train roughing roughly T font, formed by web and flange above-mentioned be rolled material be rolled into finished size roughly, formed by web and flange be rolled material; And finishing mill, be arranged on the back segment of this intermediate mill group, above-mentionedly be rolled material finish rolling and become T-steel finished size, that formed by web and flange what be rolled into finished size roughly by above-mentioned intermediate mill group, the manufacturing equipment of described T-steel is characterised in that, the cooling device of the T-steel hot rolling line described at least any one party above and below of above-mentioned intermediate mill group arranges above-mentioned (1) or (2).
(4) according to the manufacturing equipment of the T-steel above-mentioned (3) Suo Shu, it is characterized in that, configure above-mentioned cooling device in the outside of the milling train main body of above-mentioned intermediate mill group.Here, milling train main body in the case of cooling device is arranged on intermediate mill group above refer to the main body of the top milling train of intermediate mill group, in the case of cooling device is arranged on intermediate mill group below refer to the main body of the rearmost milling train of intermediate mill group.The outside of milling train main body refer to the roll chock etc. of accommodating the roll for supporting corresponding milling train housing, extend the outside that is set to the guide class in housing.
(5) according to the manufacturing equipment of the T-steel above-mentioned (3) or (4) Suo Shu, it is characterized in that, at the cooling device that above-mentioned (1) or (2) described T-steel hot rolling line is set above of above-mentioned finishing mill.
(6) according to the manufacturing equipment of the T-steel above-mentioned (5) Suo Shu, it is characterized in that, the outside of the milling train main body of above-mentioned finishing mill configures above-mentioned cooling device.
Here, the outside of milling train main body refer to the roll chock etc. of accommodating the roll for supporting milling train housing, extend the outside that is set to the guide class in housing.
(7) according to the manufacturing equipment of the T-steel described in any one in above-mentioned (3)～(6), it is characterized in that, above-mentioned intermediate mill group comprises the first universal roughing mill, edging mill and the second universal roughing mill, the width that described the first universal roughing mill has roller outer peripheral face is greater than roughly T font of the cross section that become by above-mentioned thick moulding milling train roughing, the upper and lower horizontal roller of the above-mentioned web inside dimensions (inner height of web) that is rolled material being formed by web and flange, the end face of the above-mentioned flange that is rolled material of described edging mill rolling, the width that described the second universal roughing mill has roller outer peripheral face is the upper and lower horizontal roller below the above-mentioned web inside dimensions that is rolled material, and roller rolling flange and the left and right edger roll of the end face of rolling web in the short transverse of another roller at web in the thickness of slab direction of flange.
(8) a kind of manufacture method of T-steel, T-steel is manufactured in hot rolling based on comprising following operation: thick moulding rolling process, utilize thick moulding milling train by the former material rough rolling of steel billets transporting from heating furnace become cross section roughly T font, formed by web and flange be rolled material, intermediate rolling operation, utilize intermediate mill group by the cross section being become by this thick moulding rolling process roughing roughly T font, formed by web and flange above-mentioned be rolled material be rolled into finished size roughly, formed by web and flange be rolled material, and finish rolling operation, utilize finishing mill that the roughly finished size being rolled into by this intermediate rolling operation above-mentioned is rolled to material finish rolling and become finished size, the T-steel being formed by web and flange, the manufacture method of described T-steel is characterised in that, in above-mentioned intermediate rolling operation, at least any one party before above-mentioned intermediate mill group and below, at the above-mentioned above-mentioned web that is rolled material from when carrying this state that is rolled the upper surface approximate horizontal of the roller-way of material to tilt to the front end of above-mentioned web and state that above-mentioned flange lower end is equal height, no matter under any heeling condition of above-mentioned web, all by water-cooled, in the outer surface to above-mentioned flange and inner surface, at least any one party is carried out cooling.
(9) according to the manufacture method of the T-steel above-mentioned (8) Suo Shu, it is characterized in that, in above-mentioned finish rolling operation, before above-mentioned finishing mill, at the above-mentioned above-mentioned web that is rolled material from when carrying this state that is rolled the upper surface approximate horizontal of the roller-way of material to tilt to the front end of above-mentioned web and state that above-mentioned flange lower end is equal height, no matter, under any heeling condition of above-mentioned web, all by water-cooled, in the outer surface to above-mentioned flange and inner surface, at least any one party is carried out cooling.
The cross section of the present invention roughly material that is rolled of T font is to carry out under the posture in level at web in the rolling of each milling train.
The cooling device of the T-steel hot rolling line of above-mentioned in the present invention (1) comprises carrying out the outer surface water-cooled nozzle of water-cooled as the flange outer surface of T-steel that is rolled material and/or flange inner surface being carried out to the inner surface water-cooled nozzle of water-cooled, outer surface water-cooled nozzle and/or inner surface water-cooled nozzle be arranged on as upper/lower positions and towards, in the time that the web that is rolled material tilts to the front end of web and state that flange lower end is equal height from be rolled the state of upper surface approximate horizontal of roller-way of material with respect to conveying, no matter under any heeling condition of web, all can be to the outer surface of above-mentioned flange and inner surface water filling.Thus, even in the case of arranging multiple outer surface water-cooled nozzle, inner surface water-cooled nozzle as cooling device along the rolling direction (throughput direction) that is rolled material, the not difference of the heeling condition of the web of the setting position based on each nozzle and changing, and make the spray angle of short transverse position, cooling water of nozzle identical, also can realize simplified apparatus structure, reduce the object of cost of equipment.And, owing to need to not carrying to length direction towards the posture of general horizontal direction with the web that is rolled material, thereby do not need supporting to be rolled the mechanism of the web front end of material, thereby can reduce cost of equipment.
And, in the cooling device of the T-steel hot rolling line of above-mentioned in the present invention (2), carry out the inner surface water-cooled nozzle of water-cooled as the flange inner surface to the T-steel that is rolled material, comprise: upper flange inner surface water-cooled nozzle, carry out cooling to the upper flange inner surface of web upside, and lower flange inner surface water-cooled nozzle, lower flange inner surface to web downside carries out cooling, the jet angle of upper flange inner surface water-cooled nozzle is the angle of the α downward with respect to the upper surface of roller-way, the jet angle of lower flange inner surface water-cooled nozzle is the angle with respect to the upper surface of roller-way β upwards, set the jet angle α (α < β) that makes the jet angle β of lower flange inner surface water-cooled nozzle be greater than upper flange inner surface water-cooled nozzle for, thus no matter under any heeling condition of web, the cooling water that flange inner surface up and down sprays all clashes with more subvertical angle, thereby cooling capacity improves.And the difference of the state of cooling of upper lower flange diminishes, can reduce the temperature difference of upper lower flange.
The manufacture method of the T-steel of the manufacturing equipment of the T-steel of above-mentioned according to the present invention (3) and above-mentioned (8), due in intermediate mill group above and/or below, in rolling way, carry out cooling by water-cooled to the flange that is rolled material, thereby can during water-cooled, be rolled being rolled material, thereby can reduce the amount of bow that is rolled material production in a water-cooled.And, can be by next rolling at every turn carrying out plastic working owing to flange being carried out to the bending that water-cooled produces, even thereby flange being carried out water-cooled and is reduced the temperature difference of flange and web, also can reduce to the bending that is rolled material flange side.Thus, the bending that can make to occur in rolling way that flange water-cooled causes reduces, can not cause that bending causes is rolled the fly out generation of the problems such as production line is outer of material, and T-steel is rolled.
And, the manufacturing equipment of the T-steel of above-mentioned according to the present invention (4), because cooling device is configured in the outside of the milling train main body of intermediate mill group, thereby be difficult to, to compared with the situation of the milling train main body configuration cooling device of intermediate mill group, can to obtain large cooling capacity with little cost of equipment to there is no space.And because the outer coxostermum in milling train main body roughly becomes the posture of inclination, thereby the cooling water that upwards flange inner surface sprays is not trapped in web upper surface and discharges, thereby can be suppressed at the cooling heterogeneity in top and bottom of web.
And, the manufacture method of the T-steel of the manufacturing equipment of the T-steel of above-mentioned according to the present invention (5) and above-mentioned (9), due to finishing mill above carry out coolingly by water-cooled to being rolled the flange of material, thereby can further reduce the cooling bending because of the temperature difference generation of flange and web.And, the manufacturing equipment of the T-steel of above-mentioned according to the present invention (6), because cooling device is configured in the outside of the milling train main body of finishing mill, thereby be difficult to, to compared with the situation of the milling train main body configuration cooling device of finishing mill, can obtain large cooling capacity with little cost of equipment with there is no space.And because the outer coxostermum in milling train main body roughly becomes the posture of inclination, thereby the cooling water that upwards flange inner surface sprays is not trapped in web upper surface and is discharged from, thereby can be suppressed at the cooling heterogeneity in top and bottom of web.
And, the manufacturing equipment of the T-steel of above-mentioned according to the present invention (7), above-mentioned intermediate mill group comprises the first universal roughing mill, edging mill and the second universal roughing mill, the width that described the first universal roughing mill has roller outer peripheral face is greater than roughly T font of the cross section that become by above-mentioned thick moulding milling train roughing, the upper and lower horizontal roller of the above-mentioned web inside dimensions that is rolled material being formed by web and flange, the end face of the above-mentioned flange that is rolled material of described edging mill rolling, the width that described the second universal roughing mill has roller outer peripheral face is the upper and lower horizontal roller below the above-mentioned web inside dimensions that is rolled material, and roller rolling and the left and right edger roll of the end face of rolling web in the short transverse of another roller at web in the thickness of slab direction of flange.Thus, only just can realize the web that shape is good, web height meets desired value of end by hot rolling, need to after hot rolling, not cut off web leading section.Owing to not needing to cut off operation, can shorten manufacturing process, reduce manufacturing cost.In addition, owing to can, by change the rolling rate balance of web and flange with the first and second universal roughing mill, with rolling mode, the bending that goes out side that is rolled material being controlled, thereby can easily carry out the bending control of water-cooled.
Wherein, web thickness is less than 2 times of above shipbuildings that thickness of flange, web height are flange width with in T-steels, owing to easily causing the temperature difference of flange and web to become large in hot rolling, after hot rolling, be difficult in addition correct cooling bending, thereby applicable the present invention can obtain ideal effect.
Brief description of the drawings
Fig. 1 is the brief configuration figure of the embodiment of the manufacturing equipment of T-steel of the present invention.
Fig. 2 is the figure that represents cooling device of the present invention to be configured in the state in the outside of the milling train main body of the first universal roughing mill that forms intermediate mill group.
Fig. 3 (a) is near structure for cooling device of the present invention is described and when being rolled material and being undertaken by cooling device Rolling roller time the schematic diagram of cooling situation.Fig. 3 (b), Fig. 3 (c) are for illustrating that being rolled material separates and web tilts and until be positioned in and carry out the schematic diagram of cooling situation by cooling device roller-way from Rolling roller.
Fig. 4 is the schematic diagram of other structure for cooling device of the present invention is described.
Fig. 5 is the schematic diagram of the other structure for cooling device of the present invention is described.
Fig. 6 is the schematic diagram of the first universal roughing mill of using for the manufacturing equipment of the T-steel shown in key diagram 1.
Fig. 7 be use for the manufacturing equipment of the T-steel shown in key diagram 1 the schematic diagram of edging mill.
Fig. 8 is the schematic diagram of the second universal roughing mill of using for the manufacturing equipment of the T-steel shown in key diagram 1.
Fig. 9 is the schematic diagram of the variation of the second universal roughing mill of using for the manufacturing equipment of the T-steel shown in key diagram 1.
Figure 10 is the schematic diagram of the finishing mill that uses for the manufacturing equipment of the T-steel shown in key diagram 1.
Figure 11 is the sectional view of T-steel.
Figure 12 is the brief configuration figure that represents the manufacturing equipment of T-steel in the past.
Figure 13 (A) is the schematic diagram of the thick moulding milling train that uses of the manufacturing equipment for T-steel is in the past described; Figure 13 (B) is the schematic diagram of the universal roughing mill that uses of the manufacturing equipment for T-steel is in the past described; Figure 13 (C) is the schematic diagram of the edging mill that uses of the manufacturing equipment for T-steel is in the past described; Figure 13 (D) is the schematic diagram of the universal finishing mill that uses of the manufacturing equipment for T-steel is in the past described.
Figure 14 is the roughly sectional view of the T-steel base of T word shape of cross section.
Figure 15 is the part side view of the bending status to flange side on the cooling way for T-steel is described.
Detailed description of the invention
Below, with reference to accompanying drawing, embodiments of the present invention are described.Fig. 1 is the brief configuration figure of the embodiment of the manufacturing equipment of T-steel of the present invention.The manufacturing equipment 1 of the T-steel shown in Fig. 1, from upstream side side downstream, configures successively thick moulding milling train 2, intermediate mill group 3 and finishing mill 7 and forms from leading portion side direction rear section side.
Thick moulding milling train 2 to being rolled of carrying at roller-way (not shown) from heating furnace (not shown) material (former material steel billet, not shown) carries out reciprocal rolling and roughing become cross section roughly T font formed by web and flange be rolled material (T-steel base, with reference to Figure 14) H (slightly moulding rolling process).As thick moulding milling train 2, can utilize known equipment, for example, be equipped with the duo mill of the roller with pass.
Intermediate mill group 3 is arranged on the back segment of thick moulding milling train 2, by the cross section being become by 2 roughing of thick moulding milling train roughly in T shape formed by web 21 and flange 22 be rolled material H be rolled into finished size roughly, formed by web 21 and flange 22 be rolled material H (intermediate rolling operation).In the present embodiment, the first universal roughing mill 4 as shown in Figure 6 of this intermediate mill group 3, be arranged on the edging mill 5 shown in Fig. 7 of back segment of this first universal roughing mill 4 and be arranged on the second universal roughing mill 6 shown in Fig. 8 of back segment of edging mill 5 and form.Wherein, this intermediate mill group 3 is made up of two universal roughing mills and an edging mill, but this is only an example wherein, and the number of units of the milling train of intermediate mill group 3 does not limit, for example, also can be made up of a universal roughing mill and an edging mill.And, also can be formed by more than three universal roughing mill and more than two edging mill.
Here, as shown in Figure 6, pair of right and left edger roll 42a, 42b that the first universal roughing mill 4 comprises upper and lower a pair of horizontal roller 41a, the 41b being rotated centered by trunnion axis and is rotated centered by vertical axis.Upper and lower a pair of horizontal roller 41a, 41b and pair of right and left edger roll 42a, 42b be configuration relatively respectively.The width W 1 of the outer peripheral face of horizontal roller 41a, 41b is set the inside dimensions L (distance from flange inner surface to web front end) that is greater than the web 21 that is rolled material H for.The width W 1 of the outer peripheral face of horizontal roller 41a, 41b be preferably web 21 inside dimensions L 105～150%.
In the first universal roughing mill 4, the whole face of web 21 short transverses is rolled along thickness of slab direction by horizontal roller 41a, 41b, in the side of edger roll 42a and horizontal roller 41a, 41b, flange 22 is rolled along its thickness of slab direction.The thickness of slab adjustment of web 21 is undertaken by the aperture of adjusting horizontal roller 41a, 41b, and the thickness of slab adjustment of flange 22 is undertaken by the aperture of adjusting between edger roll 42a and the side of horizontal roller 41a, 41b.
And, as shown in Figure 7, edging mill 5 comprises edger roll 51a, the 51b along horizontal axis with large footpath roller portion 53 and path roller portion 52, and 53 guiding of footpath roller portion are rolled the web 21 of material H greatly, and the roller surface 52a of path roller portion 52 is rolled along its width the end face of flange 22.Preferably the roller footpath of large footpath roller portion 53 and the roller footpath of path roller portion 52 are adjusted into, and in the end face of flange 22 being rolled by path roller portion 52, make the roller surface of large footpath roller portion 53 have some gaps in the top and bottom of the thickness of slab direction of web 21.By some gaps are set, can eliminate the unnecessary rolling counter-force producing when large footpath roller portion 53 contacts with web 21, and footpath roller portion 53 plays a role as guiding piece greatly, produce the consistent effect of length making from upper and lower web surface to upper and lower flange front end, and improve accuracy to size.Gap is preferably below 2mm.
In addition, as shown in Figure 8, the second universal roughing mill 6 comprises edger roll 62a, the 62b of upper and lower a pair of horizontal roller 61a, the 61b being rotated centered by trunnion axis and the pair of right and left being rotated centered by vertical axis.Upper and lower a pair of horizontal roller 61a, 61b and pair of right and left edger roll 62a, 62b be configuration relatively respectively.The width W 2 of the roller outer peripheral face of horizontal roller 61a, 61b is for to be rolled below the inside dimensions L (distance from flange inner surface to web leading section) of web 21 of material H.The width W 2 of the roller outer peripheral face of horizontal roller 61a, 61b is preferably 70～100% left and right of the inside dimensions L of web 21.And then more than the difference of W1 and W2 is preferably and guarantees 30mm.Because give prominence to laterally on the roller surface of comparing horizontal roller 61a, 61b at the leading section that the flange 22 that is rolled material H is pressed to the situation bottom web 21 of the side of horizontal roller 61a, 61b, thereby can use edger roll 62b rolling web 21.
Wherein, make in situation that the width W 2 of roller outer peripheral face of horizontal roller 61a, the 61b of the second universal roughing mill 6 is identical with the inside dimensions L of web 21 that is rolled material H, as shown in Figure 9, preferably use the roller that the bight c of the leading section side of web 21 is processed into the shape of not rolling web surface.Because the width W 2 of the roller outer peripheral face of horizontal roller 61a, 61b is identical with the inside dimensions L of web 21, can use the front end of edger roll 62b rolling web 21, and due to be processed into not rolling web surface shape bight c and can near the leading section of web 21 and between horizontal roller 61a, 61b, produce space, thereby can absorb the web thickness recruitment causing due to the leading section of rolling web 21.As the processing of bight c, for example, carry out circular-arc processing, chamfer machining, step processing etc.
In the second universal roughing mill 6, adjust the roller aperture of horizontal roller 61a, 61b and adjust the thickness of slab of web 21, and adjust the thickness of slab of flange 22 by adjusting the aperture of a side side in edger roll 62a and horizontal roller 61a, 61b, adjust the height of web 21 and the shape of end by the aperture of the opposing party's side in adjustment edger roll 62b and horizontal roller 61a, 61b.
In the intermediate rolling operation of carrying out at the first universal roughing mill 4 that forms intermediate mill group 3 by above-mentioned, edging mill 5 and the second universal roughing mill 6, until the shape obtaining can be carried out finish rolling, be back and forth rolled.In intermediate rolling operation, be rolled from the vertical state tilting laterally at flange.
And finishing mill 7 is arranged on the rear of intermediate mill group 3, become T-steel 20 (finish rolling operation) finished size, that formed by web 21 and flange 22 by be rolled into the roughly material H finish rolling that is rolled of finished size by intermediate mill group 3.Finishing mill 7 is made up of universal finishing mill, as shown in figure 10, and the pair of right and left edger roll 72a, the 72b that comprise upper and lower a pair of horizontal roller 71a, the 71b being rotated and be rotated centered by vertical axis centered by trunnion axis.The side of horizontal roller 71a, 71b and roller surface are orthogonal.If gently depress the flange 22 that rolling is rolled material H with edger roll 72a, to be configured as relative web 21 vertical for flange 22.By edger roll 72b being pressed to the side of side horizontal roller 71a, 71b, not relative with flange 22, can make horizontal roller 71a, 71b axially not move.
In universal finishing mill, with almost not rolling or finishing shape/size mild degree rolling web 21.Particularly, utilize the rolling undertaken by the second universal mill 6, in the case of near part (leading section of web 21) the generation thickness of slab of the part by horizontal roller 61a, 61b rolling and not rolling is poor, carry out saddening system poor to eliminate described thickness of slab.In order to reach this object, make the width of the rolling surface of horizontal roller 71a, 71b be greater than web inside dimensions.Preferably, be 105～150% left and right of the inside dimensions L of web 21.
In general, the shape of the edger roll of flange 22 sides of universal finishing mill and universal roughing mill is different.In universal roughing mill, as shown in Figure 8, the side face of edger roll 62a consistently becomes chevron shape with the inclination of flange, but in universal finishing mill, as shown in figure 10, and the side face of the edger roll 72a shape that is in line.
And, as shown in Figure 1, in the manufacturing equipment 1 of the T-steel of present embodiment, before intermediate mill group 3 (towards a side of thick moulding milling train) and (towards a side of universal finishing mill) below, the first universal roughing mill 4 above and the second universal roughing mill 6 be provided with cooling device 8,9 below.
Fig. 2 is the figure that represents the cooling device 8 above that is arranged on the first universal roughing mill 4.The first universal roughing mill 4 comprises: housing 11, for accommodating the roll chock etc. of supporting upper and lower a pair of horizontal roller 41a, 41b and pair of right and left edger roll 42a, 42b (not shown); Web guide 12a～12d, is fixed on housing 11, will be rolled material H and guide to the subline center, road in the space being surrounded by horizontal roller 41a, 41b and edger roll 42a, 42b.And, cooling device 8 is arranged on outside above with respect to the milling train main body that comprises housing 11 and web guide 12a～12d, be configured to and there are multiple water-cooled nozzle of arranging along rolling line, and carry out cooling to outer surface and the inner surface of the flange 22 that is rolled material H.
As shown in Fig. 3 (a), cooling device 8 comprises to the outer surface of the flange 22 that is rolled material H and sprays the outer surface water-cooled nozzle 8a of cooling water.Here, under the state shown in Fig. 3 (a), be rolled near material H maintenance rolling posture horizontal roller 41a, the 41b of the first universal roughing mill 4 and edger roll 42a, 42b, web 21 becomes the state of almost parallel with respect to the upper surface of roller-way 13.On the other hand, if being rolled material H departs from from the first universal roughing mill 4, the web 21 that is rolled material H becomes the state of approximate horizontal from be rolled the upper surface of roller-way 13 of material H with respect to conveying, as shown in Fig. 3 (b), the front end of web 21 declines and web inclination, as shown in Fig. 3 (c), the front end that tilts to web 21 at the position of leaving several m touches roller-way 13 and the state identical with the height of the lower end of flange 22.The state from Fig. 3 (a) now to the distance of the state of Fig. 3 (c) according to being rolled the size, intensity of material H difference.As shown in Fig. 3 (a)～Fig. 3 (c), the outer surface water-cooled nozzle 8a of cooling device 8 be arranged on be no matter any heeling condition of web 21 all can be to the position of the outer surface water filling of flange 22 and towards.
And, as shown in Fig. 3 (a), in cooling device 8, be provided with to upper and lower a pair of inner surface water-cooled nozzle 8b, the 8c (following, be referred to as upper flange inner surface water-cooled nozzle 8b and lower flange inner surface water-cooled nozzle 8c) of inner surface water filling of flange 22 that is rolled material H.As shown in Fig. 3 (a)～Fig. 3 (c), these upper flange inner surfaces water-cooled nozzle 8b and lower flange inner surface water-cooled nozzle 8c and outer surface water-cooled nozzle 8a are in the same manner, be arranged on as upper/lower positions with towards: in the time that the web 21 that is rolled material H becomes the state of approximate horizontal to tilt to the front end of web 21 and state that flange 22 lower ends are equal height from be rolled the upper surface of roller-way 13 of material H with respect to conveying, no matter under any heeling condition of web 21, all can be to the inner surface water filling of flange 22.Thus, even arrange multiple outer surface water-cooled nozzle 8a, upper flange inner surface water-cooled nozzle 8b and lower flange inner surface water-cooled nozzle 8c and in situation as cooling device 8 along the rolling direction (throughput direction) that is rolled material H, the not difference of the heeling condition of the web of the setting position based on each nozzle and changing, make the short transverse position of nozzle and the spray angle of cooling water identical, can realize the object of simplified apparatus structure, reduction cost of equipment.And, even because being rolled that material H separates from the first universal roughing mill 4, web 21 produces the state of carrying the state that tilts, also can coolingly be rolled the flange of material H, thereby do not need flatly to keep the web front end support apparatus of web, thereby can reduce cost of equipment.And, can be until the position separating from milling train arranges cooling device, the free degree that increases cooling capacity by increasing cooling length is improved.
Wherein, can be according to required cooling capacity, any one party in outer surface water-cooled nozzle 8a and upper flange inner surface water-cooled nozzle 8b and lower flange inner surface water-cooled nozzle 8c (outer surface water-cooled nozzle 8a is only set or upper flange inner surface water-cooled nozzle 8b is only set and lower flange inner surface water-cooled nozzle 8c) is only set, or only uses any one party according to required cooling capacity.
The flange mostly 22 that is rolled material H here, is that the temperature of inner surface is higher than the temperature of outer surface.This is that in contrast, near of flange outer surface does not exist high temp objects, thereby temperature easily declines because flange inner surface is accepted radiation heat from the web of high temperature.And, with regard to flange inner surface, because the direction in rotary moving of horizontal roller side is different from the direct of travel that is rolled material, the slip on roller and rolling stock surface is larger, the heating that friction causes is larger, but with regard to flange outer surface, because the direction in rotary moving on roller surface is identical with the direct of travel that is rolled material, thereby frictional heating is little.So, only any one party being carried out cooling in the situation that, cooling for the high flange inner surface of temperature is carried out, preferably only arrange or use upper flange inner surface water-cooled nozzle 8b and lower flange inner surface water-cooled nozzle 8c.
In addition, in cooling device 8, for cooling upper flange inner surface effectively under the state in level at web, preferably make to be arranged to from level downward from the spray angle of the cooling water of upper flange inner surface water-cooled nozzle 8b.If make spray angle downward, at web under the state in level, the cooling water that upper flange inner surface is carried out to water-cooled is difficult to collide web.And, can, by being rolled material H and guiding on the side guide piece (not shown) of the left and right of milling train, upper flange inner surface water-cooled nozzle 8b being set, there is the cost of equipment cheapness that can make nozzle arrange.On the other hand, never hinder left and right side guide piece action and effectively carry out cooling object, lower flange inner surface water-cooled nozzle 8c preferably with form be arranged on than the upper surface of the roller-way position of side on the lower from the mode of level spray angle upwards.
Here, as Fig. 4 as shown, preferably cooling device 8 be set to lower flange inner surface water-cooled nozzle 8c from level jet angle β be upwards greater than upper flange inner surface water-cooled nozzle 8b from the downward jet angle α of level.This be because the posture that is rolled material H only near horizontal roller 41a, 41b and edger roll 42a, 42b the web 21 of formation as shown in Fig. 3 (a) be the posture of approximate horizontal, and at the outer coxostermum 21 of milling train main body the state for tilting.That is, in the manufacture of the T-steel being undertaken by hot rolling, be to be generally rolled the state that the web 21 of material H tilts, the water cooling equipment that is applicable to this state is effective.If be configured such that lower flange inner surface water-cooled nozzle 8c from level jet angle β be upwards greater than upper flange inner surface water-cooled nozzle 8b from the downward jet angle α of level, to being rolled that the lower flange inner surface of flange 22 of material H carries out between the direction of cooling water of water-cooled and web that angulation becomes large and cooling water is difficult to collide web, be difficult to produce and reduce the problem that does not need the temperature of carrying out cooling web.And, even the web 21 that is rolled material H in heeling condition, due to cooling water be rolled material H flange 22 lower flange inner surface impact angle approach vertical, thereby have raising cooling capacity effect.Wherein, as shown in Figure 4, also can downward inclination angle be set to the outer surface water-cooled nozzle 8a of the flange outer surface of the cooling flange 22 that is rolled material H.
Wherein, can suitably set according to the specification that is rolled material, equipment the concrete angle of each water-cooled nozzle, but what preferably select is that α is that 5～50 ° of left and right, β are that the downward inclination angle of 15～60 ° of left and right, outer surface water-cooled nozzle 8a is 0～45 ° of left and right.And preferably β is than large 10～40 ° of left and right of α.As shown in FIG. 4 and 5, jet angle represents center line from the jet flow of nozzle (be generally nozzle towards) and horizontal angulation.
And, in Fig. 4, upper flange inner surface water-cooled nozzle 8b and lower flange inner surface water-cooled nozzle 8c are positioned at the front end outside of the web 21 that is rolled material H, form and are rolled the position relationship that material H is difficult to conflict with upper flange inner surface water-cooled nozzle 8b and lower flange inner surface water-cooled nozzle 8c.In addition, as shown in Figure 5, if lower flange inner surface water-cooled nozzle 8c is arranged between the adjacent pair of rolls that forms roller-way 13, just can not worry to be rolled material H clashes, can make lower flange inner surface water-cooled nozzle 8c approach the lower flange inner surface of the flange 22 that is rolled material H, as the effect of approachingization, can obtain the cooling capacity identical with upper flange inner surface by less hydraulic pressure, the water yield still less, thereby can reduce cost of equipment.Wherein, each water-cooled nozzle of the cooling device 8 as shown in Fig. 3～5, as the mechanism that can adjust jet angle, preferably can set according to the size of the T-steel of manufacturing the structure of suitable jet angle.
And, the cooling device below 9 that is arranged on the second universal roughing mill 6 is also arranged on outside below with respect to milling train main body, described milling train main body comprises the housing and the web guide (not shown) that form the second universal roughing mill 6, has and cooling device 8 same structures (outer surface water-cooled nozzle 9a, upper flange inner surface water-cooled nozzle 9b, lower flange inner surface water-cooled nozzle 9c etc.) as shown in Fig. 3～Fig. 5.
In the intermediate rolling operation of being undertaken by intermediate mill group 3, these cooling devices 8,9, in intermediate mill group 3 above and below, carry out cooling by water-cooled to the flange 22 that is rolled material H in rolling way.Specifically, between the passage of the reciprocal rolling of being undertaken by intermediate mill group 3, be divided into the water-cooled of carrying out flange 22 for several times by cooling device 8,9.Accordingly, can be by be rolled the rolling of material H during water-cooled, make to reduce being rolled the amount of bow that material H produces because of water-cooled.And, can carry out plastic working by next rolling and make it to straighten because flange 22 being carried out to the bending of water-cooled generation each, even flange 22 is carried out water-cooled and reduces the temperature difference of flange 22 and web 21, the bending to flange 22 sides that also can guarantee to be rolled material H is less.Thus, can avoid finishing mill (universal finishing mill) 7 below carry out hot rolling after the problem that causes of the prior art of cooling flange faces in the lump large cooling bending, produce smoothly T-steel.
Wherein, if to being rolled the flange 22 of material H, to carry out brute force cooling at a position of intermediate mill group 3, will due to as prior art problem points be rolled material H to flange 22 lateral bends, thereby hinder rolling operation.Thus, need to carry out flange 22 in rolling way mid-score time cooling, for this reason preferably respectively intermediate mill group 3 above and cooling device 8,9 is set below.But, in the case of obtaining required cooling capacity, can before intermediate mill group 3 or below, cooling device 8 or 9 be set optional position.And, need not between the passage of whole reciprocal rolling, use these cooling devices 8,9, as long as suitably select to carry out cooling passage according to the temperature, the ability of cooling device 8,9 etc. that are rolled material H, between multiple passages, carry out cooling arbitrarily.
And, before finishing mill (universal finishing mill) 7, be also provided with the cooling device arbitrarily 10 of the present invention shown in Fig. 3～5.In finish rolling operation, cooling device 10 carries out cooling by water-cooled to the flange 22 that is rolled material H above finishing mill 7.Due to also can be by this cooling device 10 be set, in finish rolling operation to be rolled the flange 22 of material H carry out cooling, thereby with only intermediate mill group 3 above and arrange below compared with the situation of cooling device 8,9 and can effectively prevent cooling bending.Wherein, do not need to arrange this cooling device 10.And, also can arranging, by water-cooled, the flange 22 of rolling stock H being carried out to cooling cooling device (not shown) below at finishing mill 7.
, preferably consider the aspects such as cooling capacity, productivity, equipment cost here, the length of rolling direction of the cooling device 8,9 above and below that is arranged on intermediate mill group 3 is set.For example cooling device is too short, cause cooling capacity deficiency in the situation that, mill speed is slow, and will cause rolling time elongated in order to make up this defect, and productivity reduces, thereby preferably guarantees the length of cooling capacity abundance.On the other hand, if cooling device is long, due to elongated by the time in cooling device 8,9, thereby cooling capacity improves, but cause following problem: will be rolled material H be transported to pass from cooling device 8,9 till time, move to the position quite far away apart from intermediate mill group 3, long at the traveling time that is rolled material H of back and forth rolling, thereby productivity reduces.And, if the length of the rolling direction of cooling device 8,9 is long, the quantitative change of the cooling water of use, cause the equipment cost such as pump, pipe arrangement too high more.For example the length of the rolling direction of cooling device 8,9 can be made as to 5m above and below 20m, but be not limited to this, can consider above-mentioned situation and suitably set according to the specification that is rolled material, equipment.
On the other hand, the rolling of finishing mill 7 is generally 1 passage, even and because mill speed slowly also affects productivity hardly, thereby while setting for the length of cooling device 10 above that is arranged on finishing mill 7, can consider hardly the situation of the cooling device 8,9 and below as being arranged on intermediate mill group 3 above.Therefore from guaranteeing the viewpoint of cooling capacity, preferably setting the length identical with the length of cooling device 8,9 for, for example, is more than 5m, but is less than also Cheng Tai great problem not of 5m.And cooling device 10 maximum lengths be intermediate mill group 3 below and finishing mill 7 above between distance.
Wherein, in the present embodiment, the cooling device 10 above that is arranged on the cooling device 8,9 above and below of intermediate mill group 3 and is arranged on finishing mill 7 is configured in to the outside of milling train main body.This is because there is no space and be difficult to arrange effective cooling device in milling train main body under normal circumstances.In addition,, if carrying out the cooling of upper flange inner surface the most nearby apart from milling train, because web is in level, thereby cooling water is trapped in web upper surface and likely causes the inhomogeneous cooling one carrying out in top and bottom.For this problem, due to as long as in the outside of milling train main body, be just easier to arrange cooling device, and web is the posture roughly tilting, thereby the cooling water that upwards flange inner surface sprays can not be trapped in web upper surface but is discharged from.Therefore, preferably cooling device 8,9,10 is configured in to the outside of milling train main body.
On the other hand, cooling device 8,9,10 of the present invention, even due to also can cooling flange under the posture of the web identical with being rolled the rolling posture of material H on each milling train in level, thereby can arrange near milling train main body.For example, in order to improve the rolling efficiency (shortening rolling time) of the reciprocal rolling in intermediate rolling operation, distance between milling train main body and cooling device (immediate water-cooled nozzle) is more closely better, and preferably making the distance B between milling train main body and cooling device is below 10m.And then preferably distance B is made as below 5m.
And, as feature of the present invention, when the upper surface of relatively carrying at the web that is rolled material the roller-way that is rolled material tilts to from the state of approximate horizontal the state that the front end of web and the lower end of flange are equal height, no matter under any heeling condition of web, all the outer surface to above-mentioned flange and inner surface carry out cooling, from this viewpoint, the situation of cooling device of the present invention and cooling means 2 times of above T-steels that be specially adapted to use as purposes such as shipbuildings, that web height is flange width.Be less than the T-steel of 2 times of flange width for web height, because the flange on roller-way becomes significantly the state tilting, thus exist cooling water with the angle of attack of ledge surface that is rolled material from plumbness departs from greatly and cooling capacity declines situation.For this problem, as long as the web height 2 times of above T-steels that are flange width, arranging multiple outer surface water-cooled nozzle 8a, upper flange inner surface water-cooled nozzle 8b and lower flange inner surface water-cooled nozzle 8c as cooling device 8 in the situation that, even if make the spray angle of short transverse position, the cooling water of nozzle keep certain at each nozzle 8a, 8b, 8c, also cooling water and the angle of attack of ledge surface that is rolled material can be remained on to proper range under any heeling condition of web within.
Wherein, in the present embodiment, in the situation that arranging multiple outer surface water-cooled nozzle 8a, upper flange inner surface water-cooled nozzle 8b and lower flange inner surface water-cooled nozzle 8c as cooling device 8, make the short transverse position of nozzle, the spray angle of cooling water keep certain, but the invention is not restricted to this at each nozzle 8a, 8b, 8c.In order to make cooling water more appropriate with the angle of attack of ledge surface that is rolled material, for example, for outer surface water-cooled nozzle 8a, each nozzle can be as described belowly set: according to the heeling condition of the flange of the setting position of nozzle, form along with away from milling train main body nozzle height direction position uprise, different short transverse position and the spray angles such as the spray angle increase of cooling water.
And, in Fig. 2, be equally spaced provided with in the same manner upper flange inner surface water-cooled nozzle 8b and lower flange inner surface water-cooled nozzle 8c along rolling direction phase place, but be not limited to this configuration mode.Can distinguish individually with suitable interval and quantity configuration nozzle 8a, 8b and 8c.The configuration space of the rolling direction of for example nozzle needn't be for uniformly-spaced, also there is no need to make the position of rolling direction and other nozzle simultaneously.In addition except nozzle towards shape, size etc. also can be selected for the location-appropriate of each rolling direction.But, from the viewpoint of cooling control ability preferably as shown in Figure 2, nozzle 8a～8c is set between each roller, in embodiment described later, also adopt this configuration.
Then, the configuration of cooling device 8,9,10 of the flange 22 of considering the cooling T-steel for the manufacture of high strength steel specification is described.
In general, for manufacture the so-called high strength steel material (yield stress is high tension steel more than 325MPa) of high yield stress, be suitable for the temperature that makes to be rolled material in non-recrystallization region, two-phase region and the controlled rolling that is rolled.In controlled rolling, be rolled certain rolling more than degree such as rate (thickness of slab slip) is for example 30% left and right in these temperature provinces, and need to accumulate deformation at material.But, in the finish rolling operation of being undertaken by finishing mill 7, the thickness of flange 22 and web 21 has been carried out to some rollings, but this rolling rate greatly to 2～3% left and right can not meet the required rolling rate of controlled rolling.
So, need at least to carry out controlled rolling in the part passage (what preferably select is to several last time latter half of) of the intermediate rolling operation of being undertaken by intermediate mill group 3.The temperature that, need to make to be rolled material H in the way of intermediate rolling operation drops to non-recrystallization region or two-phase region.Here, if reduce the temperature of flange 22 by air cooling, exist because of the long problem that causes productivity to reduce of stand-by time.If flange 22 is carried out to the cooling temperature that reduces flange 22 by water-cooled in contrast, thereby the stand-by time productivity that shortens is improved, and can obtain by with compare cooling velocity that web 21 carries out air cooling faster speed flange 22 is carried out to cooling web 21 and the effect that the temperature difference of flange 22 diminishes of making, be also conducive to prevent the cooling bending after rolling.Thus, as the cooling device of the flange 22 of stand-by period of the rolling temperature for eliminating controlled rolling, preferably respectively intermediate mill group 3 above and the cooling device 8,9 that carries out cooling flange by water-cooled is set below.
For this reason, in the present embodiment, intermediate mill group 3 above and the cooling device 8,9 that carries out cooling flange by water-cooled is set below, and at finishing mill 7 cooling device 10 that carries out cooling flange by water-cooled is set above.Do not need the situation of high productivity maybe to need to reduce cost of equipment in the manufacture of high strength steel material, even if cooling device is not set in all positions and can be prevented to a certain extent yet the effect of the cooling bending of T-steel, but in order fully to be prevented the effect of cooling bending of T-steel, need at least intermediate mill group 3 above and the cooling device 8,9 that carries out cooling flange by water-cooled is set below.And, in order to obtain the effect of the maximum cooling bending that prevents T-steel, preferably except cooling device 8,9 is set, also carry out the cooling device 10 of cooling flange by water-cooled in the setting above of finishing mill 7.
Wherein, as mentioned above, in the present embodiment, intermediate mill group 3 is made up of two universal roughing mills and an edging mill, but this is an example wherein, and the number of units of the milling train of intermediate mill group 3 does not limit, for example, can be made up of a universal roughing mill and an edging mill.And, also can be by more than three universal roughing mill, more than two edging mill forms.But, configure the first universal roughing mill 4 in the front side of edging mill 5, configure in the intermediate mill group (UEU) 3 of the second universal roughing mill 6 at the rear side of edging mill 5, also occur in web 21 sides owing to making rolling bending both occur in flange 22 sides in the first and second universal roughing mill 4,6, and adjust bending and carry out cooling by water-cooled to flange 22, thereby compare with the intermediate mill group (UE) being formed with an edging mill by a universal roughing mill, there is the bending control of easily carrying out water-cooled.
As shown in Fig. 6 and Fig. 8, due to the 1st and second universal roughing mill 4,6 use respectively upper and lower horizontal roller 41a, 41b, 61a, 61b rolling web thickness, with the side of horizontal roller 41a, 41b, 61a, 61b and edger roll 42a, 62a rolling thickness of flange, thereby can independently adjust the rolling rate of web 21 and flange 22.In general, if the rolling rate of the rolling rate < flange 22 of web 21, the extension of flange 22 is greater than web 21, thereby it is bending to web 21 sides generations to be rolled material H, if instead the rolling rate of the rolling rate < web 21 of flange 22, is rolled material H and just produces bending to flange 22 sides.Like this, in the first and second universal roughing mill 4,6, can, by the balance of the rolling rate of change web 21 and flange 22, the bending that goes out side that is rolled material H be controlled.
On the other hand, as shown in Figure 7, due to the end face of 5 rolling flanges 22 of edging mill, thereby often there is the bending to web 21 sides by rolling.And, the flange width amount of rolling of edging mill 5 need to be made as to suitable amount in order to make flange width become target size, and adjust the leeway of amount of rolling in order to control bending less.For above-mentioned reasons, the intermediate mill group (UEU) that configures the first universal roughing mill 4 in the front side of edging mill 5, configure the second universal roughing mill 6 at the rear side of edging mill 5 is compared the intermediate mill group (UE) being made up of a universal roughing mill and edging mill and is more suitable for manufacturing T-steel.
Embodiment
As the first embodiment, the T-steel of the manufacturing equipment 1 that utilizes the T-steel shown in Fig. 1 from the steel ingot rolling of square-section with thickness 250mm, width 310mm taking web height 300mm, flange width 100mm, web thickness 9mm, thickness of flange 16mm as target size.
As shown in Figure 1, at the front and back of intermediate mill group 3 and finishing mill (universal finishing mill) 7 cooling device 8,9,10 is set above.These cooling devices approach the outside of milling train main body and arrange, and the distance B between milling train main body and cooling device is 3m.The injection direction of flange outer surface water-cooled nozzle (8a, 9a etc.) is with respect to horizontal direction downward 10 °.And be configured to and be assemblied in and will be rolled material H and guide on the side guide piece of flange 22 sides of milling train and follow side guide piece and mobile along left and right directions (web height direction), the outer surface of flange 22 and the distance of flange outer surface water-cooled nozzle that are rolled material H keep certain relatively with the sectional dimension that is rolled material H.The injection direction of upper flange inner surface water-cooled nozzle (8b, 9b etc.) is with respect to horizontal direction downward 10 °, is mounted on the side guide piece of front of the web 21 that is rolled material H and moves along left and right directions.The injection direction of lower flange inner surface water-cooled nozzle (8c, 9c etc.) is with respect to upwards 30 ° of horizontal directions, and the side guide piece of following flange 22 sides moves along left and right directions.And each cooling device forms the structure that configures the cooling jet of multiple Fig. 5 along rolling direction, the cooling length of entirety is 10m.
Utilize as thick moulding milling train 2 duo mill that comprises the up-down rollers that is provided with multiple passes.As the first universal roughing mill 4 that forms intermediate mill group, utilize the milling train of structure as shown in Figure 6.As horizontal roller 41a, 41b, utilizing the angle of vertical direction (the side angulation of perpendicular directional line and horizontal roller 41a, 41b) is from the side the roller of 7 °.Edger roll 42a, the 42b of left and right configure relatively, and cross sectional shape is taking the width center on roller surface as summit, and for to have from the laterally zygomorphic chevron shape of the hypotenuse of 7 ° of angles of vertical tilt.And, in edger roll 42a, the 42b of left and right, the signature pressure of edger roll of the side of giving as security setting-out plain-barreled roll 41a, 41b is adjusted, in case horizontal roller 41a, 41b move along horizontal axis because of the rolling of flange 22.
Utilize the milling train of structure as shown in Figure 7 as edging mill 5.The inclination angle of step part is the angle of 7 ° from vertically.Utilize the milling train of structure as shown in Figure 8 as the second universal roughing mill 6.In horizontal roller 61a, 61b, make the side of rolling flange 22 sides from 7 ° of angles of plumbness inclination.And, in edger roll 62a, the 62b of left and right, the cross sectional shape of one side's of rolling flange 22 edger roll 62a be width center using roller surface as summit, have from the tilt laterally zygomorphic chevron shape of hypotenuse of 7 ° of angles of plumbness, be the cylinder type that roller has an even surface along the opposing party's of the leading section of short transverse rolling web 21 edger roll 62b.Finishing mill 7 utilizes the universal finishing mill of structure as shown in figure 10.
And the structure of cooling device 8,9 above and below that is arranged on intermediate mill group 3 is as follows: can utilize outer surface and the inner surface both sides of water-cooled to flange 22 to carry out cooling on long 10m by multiple nozzles of arranging along rolling direction.And the structure of cooling device 10 above that is arranged on finishing mill 7 is as follows: can by multiple nozzles of arranging along rolling direction, on long 10m, by water-cooled, the outer surface to flange 22 and inner surface both sides carry out cooling.
In the manufacture of T-steel, the steel ingot heating up at heating furnace at first with thick moulding milling train 2 rollings, manufactures roughly T-steel base in T shape of cross section as shown in figure 14.The web thickness of the T-steel base obtaining is that 40mm, thickness of flange are that 75mm, web height are that 375mm, flange width are 130mm.Then, in the reciprocal rolling of carrying out 5 passages according to the order of the first universal roughing mill 4, edging mill 5 and the second universal roughing mill 6 from the intermediate mill group 3 of the upstream side nearly configuration of side joint downstream, and rolling web 21 and flange 22.Now, utilize water-cooled to carry out cooling to the flange that is rolled material H 22 passing through by the cooling device 8 and 9 of the front-back setting in intermediate mill group 3.Wherein, the outer surface to flange 22 and inner surface both sides carry out cooling.Finally, carry out the rolling of 1 passage at finishing mill 7, saddening flange 22 processed and inclination moulding is trimmed to vertically.Now, utilize the cooling device 10 above that is arranged on finishing mill 7, by water-cooled, the flange outer surface and the inner surface both sides that are rolled material H are carried out to water-cooled.Saddening web portion processed.
The surface temperature that is rolled material H below measuring of finishing mill 7 learns that the surface temperature of flange 22 is 720 DEG C, and the surface temperature of web 21 is 725 DEG C.This is rolled to material H, and to be cooled to the long amount of bow of every 10m after room temperature be below 5mm, very little.
And, as the second embodiment, not finishing mill 7 above cooling device 10 is set, and only intermediate mill group 3 above and cooling device 8,9 be set below and carry out the rolling of T-steel.With the operation rolling T-steel identical with the first embodiment, and utilize water-cooled to carry out cooling to the flange that is rolled material H 22 passing through in the front and back of intermediate mill group 3.Implement finish rolling not the carrying out water-cooled above of finishing mill 7.The surface temperature that is rolled material H below measuring of finishing mill 7 learns that the surface temperature of flange 22 is 741 DEG C, and the surface temperature of web 21 is 729 DEG C.Being rolled in material H cooled, there is the bending of 9mm left and right in every 10m length.In general, the amount of bow of shaped steel is that every 1m length is below 1mm, by carrying out some correction processing bending is controlled to and produces finished product in tolerance exceeding part.
On the other hand, as a comparative example, do not carry out the cooling by water of the flange 22 before front and back and the finishing mill 7 of intermediate mill group 3, and carry out water-cooled after finishing mill 7, and with identical hot-rolled process rolling T-steel.Measure finishing mill 7 surface temperature that is rolled material H after tight and learn, the surface of flange 22 is 833 DEG C, and the surface temperature of web 21 is 735 DEG C.
Finishing mill 7 below this flange 22 that is rolled material H is carried out to water-cooled time, in cooling device, there is the bending to flange 22 sides, be rolled material H and touch cooling device, thereby can not carry and be rolled material H, and hinder operation.To be rolled material H and be cooled to room temperature time, cooled amount of bow corresponding to the every 10m length of material H that be rolled is 85mm left and right.Because amount of bow is excessive, thereby need to utilize punching press to carry out detorsion, cause manufacturing cost to increase, the obstruction productivity thereby stamping procedure expends time in.The bending particularly occurring due to subtend web 21 sides is corrected, thereby the web 21 that mostly occurs in punching course is compressed and the situation of the shape defect of lateral deflection, and punching press is corrected very difficult.Can not correct the T-steel that improves shape defect with punching press becomes steel scrap, and yield rate reduces and manufacturing cost significantly increases.
As mentioned above, if use manufacturing equipment and the manufacture method of T-steel of the present invention, can prevent from hindering and productively in a large number produce T-steel by hot rolling with low cost by the cooling bending causing.
Label declaration
The manufacturing equipment of 1 T-steel
2 thick moulding milling trains
3 intermediate mill groups
4 first universal roughing mills
5 edging mills
6 second universal roughing mills
7 finishing mills (universal finishing mill)
8,9,10 cooling devices
8a, 9a outer surface water-cooled nozzle
8b, 9b upper flange inner surface water-cooled nozzle
8c, 9c lower flange inner surface water-cooled nozzle
11 housings
12a, 12b, 12c, 12d web guide
13 roller-ways
20 T-steels
21 webs
22 flanges
41a, 41b horizontal roller
42a, 42b edger roll
51a, 51b edger roll
52 path roller portions
53 large footpath roller portions
61a, 61b horizontal roller
62a, 62b edger roll
71a, 71b horizontal roller
72a, 72b edger roll
The manufacturing equipment (equipment of hot rolling) of 101 T-steels
102 thick moulding milling trains
102a top roll
102b lower roll
103 intermediate mill groups
104 universal roughing mills
141a, 141b horizontal roller
142a, 142b edger roll
105 edging mills
151a, 151b edger roll
153 large footpath roller portions
154 path roller portions
106 universal finishing mills
161a, 161b horizontal roller
162a, 162b edger roll
The width of the outer peripheral face of the horizontal roller of W1 the first universal roughing mill
The width of the outer peripheral face of the horizontal roller of W2 the second universal roughing mill
L web inside dimensions
H is rolled material
Distance between D milling train main body and cooling device
The bight (processing department) of c roller

Claims (10)

1. a manufacturing equipment for T-steel, is the manufacturing equipment of hot roll T shaped steel, comprising: thick moulding milling train, for the former material rough rolling of steel billets transporting from heating furnace is become cross section roughly T font, formed by web and flange be rolled material; Intermediate mill group, be arranged on the back segment of thick moulding milling train, for by the cross section being become by above-mentioned thick moulding milling train roughing roughly T font, formed by web and flange above-mentioned be rolled material be rolled into finished size roughly, formed by web and flange be rolled material; And finishing mill, be arranged on the back segment of this intermediate mill group, above-mentionedly be rolled material finish rolling and become T-steel finished size, that be made up of web and flange what be rolled into finished size roughly by above-mentioned intermediate mill group, the manufacturing equipment of described T-steel is characterised in that
Web at least any one party, that be rolled material above and below that the cooling device of setting is as follows arranged on to above-mentioned intermediate mill group be the posture of inclination milling train main body outside and apart from milling train main body 10m with interior distance:
Any one is set in outer surface water-cooled nozzle and inner surface water-cooled nozzle at least on the hot rolling line of T-steel, described outer surface water-cooled nozzle by water-cooled pair cross-section roughly the flange outer surface that is rolled material being formed by web and flange of T font carry out cooling, described inner surface water-cooled nozzle is carried out cooling by water-cooled to the above-mentioned flange inner surface that is rolled material
In above-mentioned outer surface water-cooled nozzle and above-mentioned inner surface water-cooled nozzle at least any one be arranged on position as described below and towards, at the above-mentioned above-mentioned web that is rolled material from when carrying this state that is rolled the upper surface approximate horizontal of the roller-way of material to tilt to the front end of above-mentioned web and state that above-mentioned flange lower end is equal height, no matter under any heeling condition of above-mentioned web, all can be at least any one party water filling in the outer surface of above-mentioned flange and inner surface
The above-mentioned above-mentioned flange inner surface that is rolled material is carried out to cooling inner surface water-cooled nozzle to be comprised: upper flange inner surface water-cooled nozzle, carry out cooling to the upper flange inner surface of above-mentioned web upside; And lower flange inner surface water-cooled nozzle, the lower flange inner surface of above-mentioned web downside is carried out cooling,
If the jet angle of above-mentioned upper flange inner surface water-cooled nozzle is the α angle downward with respect to the upper surface of above-mentioned roller-way, the jet angle of establishing above-mentioned lower flange inner surface water-cooled nozzle is with respect to the upper surface of above-mentioned roller-way β angle upwards,
The jet angle β of above-mentioned lower flange inner surface water-cooled nozzle is set as being greater than to the jet angle α (α < β) of upper flange inner surface water-cooled nozzle.
2. the manufacturing equipment of T-steel according to claim 1, is characterized in that,
Above-mentioned cooling device has above-mentioned outer surface water-cooled nozzle and above-mentioned inner surface water-cooled nozzle, this cooling device at the above-mentioned above-mentioned web that is rolled material from when carrying this state that is rolled the upper surface approximate horizontal of the roller-way of material to tilt to the front end of above-mentioned web and state that above-mentioned flange lower end is equal height, no matter under any heeling condition of above-mentioned web, all can be to the outer surface of above-mentioned flange and inner surface water filling.
3. the manufacturing equipment of T-steel according to claim 1 and 2, is characterized in that,
Above-mentioned cooling device is set before above-mentioned finishing mill.
4. the manufacturing equipment of T-steel according to claim 3, is characterized in that,
The outside of the milling train main body of above-mentioned finishing mill will be configured at the above-mentioned cooling device arranging above of above-mentioned finishing mill.
5. the manufacturing equipment of T-steel according to claim 1 and 2, is characterized in that,
Above-mentioned intermediate mill group comprises the first universal roughing mill, edging mill and the second universal roughing mill, the width that described the first universal roughing mill has roller outer peripheral face is greater than roughly T font of the cross section that become by above-mentioned thick moulding milling train roughing, the upper and lower horizontal roller of the above-mentioned web inside dimensions that is rolled material being formed by web and flange, the end face of the above-mentioned flange that is rolled material of described edging mill rolling, the width that described the second universal roughing mill has roller outer peripheral face is the upper and lower horizontal roller below the above-mentioned web inside dimensions that is rolled material, and roller rolling flange and the left and right edger roll of the end face of rolling web in the short transverse of another roller at web in the thickness of slab direction of flange.
6. the manufacturing equipment of T-steel according to claim 3, is characterized in that,
Above-mentioned intermediate mill group comprises the first universal roughing mill, edging mill and the second universal roughing mill, the width that described the first universal roughing mill has roller outer peripheral face is greater than roughly T font of the cross section that become by above-mentioned thick moulding milling train roughing, the upper and lower horizontal roller of the above-mentioned web inside dimensions that is rolled material being formed by web and flange, the end face of the above-mentioned flange that is rolled material of described edging mill rolling, the width that described the second universal roughing mill has roller outer peripheral face is the upper and lower horizontal roller below the above-mentioned web inside dimensions that is rolled material, and roller rolling flange and the left and right edger roll of the end face of rolling web in the short transverse of another roller at web in the thickness of slab direction of flange.
7. the manufacturing equipment of T-steel according to claim 4, is characterized in that,
Above-mentioned intermediate mill group comprises the first universal roughing mill, edging mill and the second universal roughing mill, the width that described the first universal roughing mill has roller outer peripheral face is greater than roughly T font of the cross section that become by above-mentioned thick moulding milling train roughing, the upper and lower horizontal roller of the above-mentioned web inside dimensions that is rolled material being formed by web and flange, the end face of the above-mentioned flange that is rolled material of described edging mill rolling, the width that described the second universal roughing mill has roller outer peripheral face is the upper and lower horizontal roller below the above-mentioned web inside dimensions that is rolled material, and roller rolling flange and the left and right edger roll of the end face of rolling web in the short transverse of another roller at web in the thickness of slab direction of flange.
8. a manufacture method for T-steel, manufactures T-steel by the manufacturing equipment of T-steel claimed in claim 1, wherein,
T-steel is manufactured in hot rolling based on comprising following operation: thick moulding rolling process, utilize thick moulding milling train by the former material rough rolling of steel billets transporting from heating furnace become cross section roughly T font, formed by web and flange be rolled material; Intermediate rolling operation, utilize intermediate mill group by the cross section being become by this thick moulding rolling process roughing roughly T font, formed by web and flange above-mentioned be rolled material be rolled into finished size roughly, formed by web and flange be rolled material; And finish rolling operation, to utilize finishing mill that the roughly finished size being rolled into by this intermediate rolling operation above-mentioned is rolled to material finish rolling and become T-steel finished size, that formed by web and flange, the manufacture method of described T-steel is characterised in that,
In above-mentioned intermediate rolling operation, at least any one party before above-mentioned intermediate mill group and below, at the above-mentioned above-mentioned web that is rolled material from when carrying this state that is rolled the upper surface approximate horizontal of the roller-way of material to tilt to the front end of above-mentioned web and state that above-mentioned flange lower end is equal height, no matter, under any heeling condition of above-mentioned web, all by water-cooled, in the outer surface to above-mentioned flange and inner surface, at least any one party is carried out cooling.
9. a manufacture method for T-steel, manufactures T-steel by the manufacturing equipment of T-steel claimed in claim 2, wherein,
T-steel is manufactured in hot rolling based on comprising following operation: thick moulding rolling process, utilize thick moulding milling train by the former material rough rolling of steel billets transporting from heating furnace become cross section roughly T font, formed by web and flange be rolled material; Intermediate rolling operation, utilize intermediate mill group by the cross section being become by this thick moulding rolling process roughing roughly T font, formed by web and flange above-mentioned be rolled material be rolled into finished size roughly, formed by web and flange be rolled material; And finish rolling operation, to utilize finishing mill that the roughly finished size being rolled into by this intermediate rolling operation above-mentioned is rolled to material finish rolling and become T-steel finished size, that formed by web and flange, the manufacture method of described T-steel is characterised in that,
In above-mentioned intermediate rolling operation, at least any one party before above-mentioned intermediate mill group and below, at the above-mentioned above-mentioned web that is rolled material from when carrying this state that is rolled the upper surface approximate horizontal of the roller-way of material to tilt to the front end of above-mentioned web and state that above-mentioned flange lower end is equal height, no matter, under any heeling condition of above-mentioned web, all by water-cooled, the outer surface to above-mentioned flange and inner surface carry out cooling.
10. the manufacture method of T-steel according to claim 9, is characterized in that,
In above-mentioned finish rolling operation, before above-mentioned finishing mill, at the above-mentioned above-mentioned web that is rolled material from when carrying this state that is rolled the upper surface approximate horizontal of the roller-way of material to tilt to the front end of above-mentioned web and state that above-mentioned flange lower end is equal height, no matter, under any heeling condition of above-mentioned web, all by water-cooled, in the outer surface to above-mentioned flange and inner surface, at least any one party is carried out cooling.
CN200980136813.0A 2008-11-28 2009-11-24 Cooling device in t-bar hot-rolling line, and t-bar manufacturing facility and manufacturing method Active CN102159335B (en)

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