WO2010058861A1 - T形鋼の製造方法および圧延設備列 - Google Patents
T形鋼の製造方法および圧延設備列 Download PDFInfo
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- WO2010058861A1 WO2010058861A1 PCT/JP2009/069989 JP2009069989W WO2010058861A1 WO 2010058861 A1 WO2010058861 A1 WO 2010058861A1 JP 2009069989 W JP2009069989 W JP 2009069989W WO 2010058861 A1 WO2010058861 A1 WO 2010058861A1
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- 238000005096 rolling process Methods 0.000 title claims abstract description 348
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 92
- 239000010959 steel Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title abstract description 22
- 239000000463 material Substances 0.000 claims description 22
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 235000014676 Phragmites communis Nutrition 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 24
- 238000005098 hot rolling Methods 0.000 description 10
- 238000007493 shaping process Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 230000037303 wrinkles Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009419 refurbishment Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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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
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/12—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel in a continuous process, i.e. without reversing stands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/06—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged vertically, e.g. edgers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/08—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/02—Profile, e.g. of plate, hot strip, sections
Definitions
- the present invention relates to a method for producing a T-shaped steel (T-bar) by hot rolling and a rolling equipment line.
- Fig. 12 shows the cross-sectional shape of the T-section steel.
- the T-section steel 10 is a section steel having a T-shaped cross section composed of a web 11 and a flange 12, and is widely used in fields such as shipbuilding and bridges. T-shaped steel products are manufactured in various dimensions depending on the application, usage conditions, location, etc.
- T-shaped steel dimensions are: web height: about 200-1000 mm, web thickness: about 8-25 mm, web inner dimension (inner height of web): about 190-980 mm, flange width: about 80-300 mm
- the flange thickness is about 12 to 40 mm.
- the web height is often more than twice the flange width.
- the web internal dimension Ai and the web external dimension (outer height of web) Ao may be used as the web height reference.
- the web inner dimension Ai is the same
- the case where the web inner dimension Ai is the same, and the case where the web outer dimension Ao is the same is called the outer web constant.
- the in-web method is constant, as shown in FIG.
- the T-section steel is generally manufactured by welding the web 11 and the flange 12, but a technique for integrally forming the T-section steel by rolling has also been proposed.
- one universal rolling mill (universal mill) is arranged in each of the intermediate rolling process and the finishing rolling process in order to efficiently produce T-shaped steel having various web thickness, flange thickness, web height and flange width.
- a hot rolling facility has been proposed (for example, Patent Document 1).
- FIG. 14 shows an example, and a rough shaping rolling mill 1 that reciprocally rolls a raw steel piece carried out from a heating furnace (not shown) to roughly form a cross-section into a substantially T-shaped section, and the rough shaping rolling mill 1 Rough universal rolling mill 2 for forming a T-shaped steel piece (not shown) roughly formed into a T-shape into a T-shaped steel having a substantially product size, and an edger rolling mill (located near the downstream of the rough universal rolling mill 2) edger mill) 3 and finishing universal rolling mill 5 (FIG. 14A).
- the rolling process by the rough universal rolling mill 2 and the edger rolling mill 3 is an intermediate rolling process
- the rolling process by the finishing universal rolling mill 5 is a finish rolling process.
- Fig. 14 (b) schematically shows the configuration of the rough universal rolling mill 2
- Fig. 14 (c) schematically shows the configuration of the edger rolling mill 3
- Fig. 14 (d) schematically shows the configuration of the finishing universal rolling mill 5.
- the rough universal rolling mill 2 has horizontal rolls 21a and 21b and vertical rolls 22a and 22b
- the finishing universal rolling mill 5 has horizontal rolls 51a and 51b and vertical rolls. 52a and 52b, and by adjusting the respective roll opening (roll gap), it is possible to roll the steel slab into products having various flange thicknesses and web thicknesses without changing the rolls.
- the edger rolling mill 3 has edger rolls 31a and 31b, which are composed of a large diameter portion 33 and a small diameter portion 32, and the end surface of the flange 12 can be crushed by the small diameter portion 32 to adjust the flange width.
- Patent Document 2 discloses a method for efficiently producing a T-shaped steel using a triaxial roughing mill and a triaxial edger. In this technique, the end face 11a of the web 11 and the end face 12a of the flange 12 are simultaneously reduced by the triaxial edger shown in FIG. 15 after rough rolling, and the height of the web 11 is also adjusted.
- Patent Document 3 discloses that when reciprocating rolling is performed on at least two universal rolling mills arranged in tandem on a rough section of T-shaped steel formed by rough rolling on a steel strip, FIG. As shown in a) and (b), the web and flange of the rough steel slab are reduced in the thickness direction by one universal rolling mill UR, and the flange of the rough steel slab is reduced in the width direction by the other universal rolling mill UF.
- a method for producing a hot rolled T-section steel characterized in that the rolling down in the width direction of the flange and the reduction in the height direction of the web are simultaneously performed.
- Patent Document 3 at least one coarse universal rolling mill UR and adjacent to the coarse steel slab of T-shaped steel formed by roughly rolling a steel slab by a rough rolling mill BD are arranged. Perform reciprocating rolling with at least one double rolling mill E, and reduce the web thickness and flange thickness of the rough shaped steel slab and adjust the web height of the rough shaped steel slab with a coarse universal rolling mill.
- the web 11 of the T-shaped slab H is pressed down in the plate thickness direction by the horizontal rolls 21a and 21b, and the roll 22a And the flange 12 of the T-shaped steel slab (rolled material) H is pressed down in the plate thickness direction between the horizontal rolls 21a and 21b.
- the side roll 22b that does not roll down the flange 12 is disposed in contact with the side surfaces of the horizontal rolls 21a and 21b, and when rolling down the flange 12, the force acting in the axial direction of the horizontal rolls 21a and 21b from the side roll 22a
- the horizontal rolls 21a and 21b are pressed against their side surfaces so as not to move.
- the width of the flange 12 is adjusted by reducing the end face in the width direction of the flange 12 of the T-shaped billet H.
- the finish rolling process the flange 12 is shaped vertically between the horizontal rolls 51a and 51b and the scissors rolls 52a and 52b by the finish universal rolling mill 5, and the web is not squeezed down in the height direction, and the T-section steel is used. The hot rolling is finished.
- the web thickness and the flange thickness are adjusted using the rough universal rolling mill 2 in the intermediate rolling process, and further, the flange end face is rolled down by the edger rolling mill 3 and the flange is moved.
- the width is adjusted, the web is not rolled down by the roll in the height direction.
- the height of the web may not necessarily be the target dimension, and the web tip (the end surface 11a of the web 11 in FIG. 12) has a cross-sectional shape (a cross-sectional shape perpendicular to the longitudinal direction of the product, and so on). Is not preferable as a product shape.
- Patent Document 1 describes that a cutting portion is provided in a horizontal roll of a finishing universal rolling mill and a web end is cut and shaped in a finishing rolling process (FIGS. 21 and 22 of Patent Document 1). Since the cut portion is burred or rounded, a product having a good cross-sectional shape cannot be obtained.
- the web is pressed down in the height direction by the roll of the second universal rolling mill shown in FIG. Can be adjusted.
- the universal rolling mill plays a role of simultaneously reducing the flange width and the web tip, the thickness reduction ratio of the web and the flange must be as small as several percent. This is because the flange width is reduced by using a step-shaped horizontal roll having a small diameter part and a large diameter part, so it is necessary to use a saddle roll having a small diameter part on the flange side. This is to cause a step difference in the flange thickness.
- the thickness of the flange tip increases, so that the step difference in the flange thickness is further increased, and the possibility that surface defects such as folds (flaws) occur on the outer surface of the flange increases. Furthermore, due to the structural problems of the second universal rolling mill as described above, although there are two universal rolling mills, the thickness is reduced substantially by only one universal rolling mill. There is a problem that the number of passes increases.
- the rolling reaction force caused by the one roll roll reducing the flange acts in the axial direction of the horizontal roll, but the roll roll on the web tip side is in contact with the side surface of the horizontal roll.
- the axial load of the horizontal roll cannot be supported by the heel roll. That is, when trying to effectively reduce the flange thickness, it is difficult to support an axial load of several thousand kN acting on the horizontal roll, and therefore the flange reduction rate cannot be increased.
- the inclination angle of the flange in the intermediate rolling is preferably 5 degrees or less.
- the contact length between the flange inner surface and the horizontal roll side surface becomes long, and the flange inner surface is easily wrinkled due to slippage between the roll and the rolled material.
- the present invention has been made to solve the above-described problems, and the shape of the web tip is good, the desired web height can be obtained with high accuracy, and the T-shaped steel is efficiently manufactured with a small number of passes.
- An object of the present invention is to provide a manufacturing method and a rolling equipment train for the purpose.
- the object of the present invention can be achieved by the following means.
- the intermediate rolling step includes a rolling step by a first rough universal rolling mill in which upper and lower horizontal rolls reduce the entire upper and lower surfaces in the web thickness direction, An edger rolling process for rolling down the end face of the flange; A plate where the width of the roll outer peripheral surface is the same as the target internal web dimension, and the web is removed from the vicinity of the tip portion using the upper and lower horizontal rolls that are processed into a shape in which the corner portion on the tip side of the web is not rolled.
- one of the left and right rolls rolls down the flange in the plate thickness direction, and the other roll roll contacts the outer circumferential surface with the upper and lower horizontal rolls while the end face of the web
- a rolling step by a second rough universal rolling mill for rolling down the web in the height direction of the web.
- a T-section rolling equipment row for rolling a web and a flange with a T-shaped steel piece roughly formed into a T-shape as a material to be rolled A first rough universal rolling mill having upper and lower horizontal rolls whose width of the outer peripheral surface of the roll is wider than a target in-web dimension of the material to be rolled; an edger rolling machine for rolling down the end face of the flange of the material to be rolled; Upper and lower horizontal rolls whose outer peripheral surface width is the same as the target in-web dimension of the material to be rolled and the corner portion on the front end side of the web is processed into a shape that does not roll the web surface, and one of them rolls down the flange in the plate thickness direction.
- a second rough universal rolling mill having left and right reed rolls that press the end surface of the web in the height direction of the web while the outer peripheral surface of the reed roll is in contact with the upper and lower horizontal rolls is arranged.
- Characteristic T-section rolling equipment line Characteristic T-section rolling equipment line.
- the following effects can be used to obtain a desired web height with high accuracy while maintaining the shape of the web tip as it is with hot rolling.
- An effective manufacturing method of shape steel and a rolling equipment train are obtained, which are extremely useful in industry. 1. Since the reduction of the web thickness and the flange thickness in the intermediate rolling process is performed by both the first and second rough universal rolling mills, compared to the case of rolling the thickness by one rough universal rolling mill, per pass It is possible to increase the reduction amount of the web thickness and the flange thickness, thereby reducing the rolling pass and improving the rolling efficiency.
- the rolling efficiency can be further improved by arranging a plurality of at least one of the first rough universal rolling mill, the edger rolling mill, and the second rough universal rolling mill.
- the outer periphery of the roll is brought into contact with the side (web tip side) that does not reduce the flange thickness of the horizontal roll, and the rolling reaction force acting in the axial direction of the horizontal roll due to the reduction of the flange thickness is By supporting and rolling down the end face of the web in the height direction, it is possible to prevent the horizontal roll from moving in the axial direction and to roll a T-shaped steel with good dimensional accuracy.
- FIG. 1 is a diagram showing an example of the arrangement of T-section steel rolling equipment used in the practice of the present invention.
- 2A and 2B are diagrams for explaining the configuration of the first rough universal rolling mill used in the practice of the present invention, in which FIG. 2A is an example thereof, and FIG. 2B is a schematic diagram explaining another example.
- FIG. 3 is a schematic diagram illustrating an example of the configuration of an edger rolling mill used in the practice of the present invention.
- FIG. 4 is a schematic diagram for explaining an example of the configuration of a second rough universal rolling mill used in the practice of the present invention.
- FIG. 5 is a schematic diagram for explaining another example of the configuration of the second rough universal rolling mill used in the implementation of the present invention.
- FIG. 1 is a diagram showing an example of the arrangement of T-section steel rolling equipment used in the practice of the present invention.
- 2A and 2B are diagrams for explaining the configuration of the first rough universal rolling mill used in the practice of the present invention, in which FIG. 2A is an example thereof
- FIG. 6 is a schematic diagram illustrating still another example of the configuration of the second rough universal rolling mill used in the implementation of the present invention.
- FIG. 7 is a schematic diagram illustrating still another example of the configuration of the second rough universal rolling mill used in the implementation of the present invention.
- FIG. 8 is a schematic diagram illustrating still another example of the configuration of the second rough universal rolling mill used in the implementation of the present invention.
- FIG. 9 is a schematic diagram illustrating still another example of the configuration of the second rough universal rolling mill used in the implementation of the present invention.
- FIG. 10 is a schematic diagram for explaining an example of the configuration of a finishing universal rolling mill used for carrying out the present invention.
- FIG. 11 is a schematic diagram for explaining a protrusion shape generated at the tip of the rolled material web.
- FIG. 11 is a schematic diagram for explaining a protrusion shape generated at the tip of the rolled material web.
- FIG. 12 is a cross-sectional view showing a cross-sectional shape of a T-shaped steel.
- FIG. 13 is a diagram showing the dimensional shape of a T-shaped steel having a constant inner method and a constant outer method.
- FIG. 13A is a diagram showing a T-shaped steel having a constant inner method
- FIG. 14A and 14B are diagrams showing a conventional T-shaped steel rolling facility, where FIG. 14A is a layout drawing of a rolling mill, FIG. 14B is a diagram illustrating a configuration of a rough universal rolling mill, and FIG. 14C is edger rolling.
- the figure explaining the structure of a mill (d) is a figure explaining the structure of a finishing universal rolling mill.
- FIG. 14A is a layout drawing of a rolling mill
- FIG. 14B is a diagram illustrating a configuration of a rough universal rolling mill
- FIG. 14C is edger rolling.
- the figure explaining the structure of a mill (d) is a figure explaining the structure of
- FIG. 15 is a diagram showing a configuration of a conventional T-section edger rolling mill.
- FIG. 16 is a diagram showing a configuration of a universal rolling mill in a conventional T-shaped steel rolling method, in which (a) is a diagram showing a configuration of a first universal rolling mill, and (b) is a second universal rolling. It is a figure which shows the structure of a machine. It is a figure which shows the rolling method of the conventional T-section steel using a rough universal rolling mill, an edger rolling mill, and a finishing universal rolling mill.
- FIG. 1 shows an example of a rolling equipment line according to the present invention, in which 1 is a rough shaping rolling mill, 2 is a first rough universal rolling mill, 3 is an edger rolling mill, and 4 is a second rough universal rolling mill.
- Reference numeral 5 denotes a finish rolling mill.
- a raw steel slab (not shown) carried out of a heating furnace (not shown) is rolled into a T-shaped steel slab having a substantially T-shaped cross section by the rough shaping rolling mill 1.
- known equipment can be used, for example, a double rolling mill equipped with a roll having a hole shape.
- the obtained T-shaped slab is rolled in a rolling equipment row in which the first rough universal rolling mill 2, the edger rolling mill 3 and the second rough universal rolling mill 4 are arranged close to each other, and a web and a flange Is reduced (intermediate rolling process).
- FIG. 2A shows a schematic diagram for explaining the structure of the first rough universal rolling mill 2.
- the first rough universal rolling mill 2 includes horizontal rolls 21a and 21b that rotate on a horizontal axis, and roll rolls 22a and 22b that rotate on a vertical axis.
- the horizontal rolls 21a and 21b and the scissors rolls 22a and 22b are opposed to each other.
- the width (width of the pressed surface) W1 of the roll outer peripheral surface of the horizontal rolls 21a and 21b is made larger than the target internal dimension L of the web 11 (the distance from the flange inner surface to the web tip). Preferably, it is about 105 to 150% of the target internal dimension L of the web 11.
- the entire surface in the height direction of the web 11 of the material H to be rolled, which is a T-shaped steel slab, is reduced in the plate thickness direction by horizontal rolls 21a and 21b,
- the flange 12 is pressed down in the plate thickness direction on the side surfaces of the horizontal rolls 21a and 21b.
- the thickness of the web 11 is adjusted by adjusting the opening of the horizontal rolls 21a and 21b, and the thickness of the flange 12 is adjusted by adjusting the opening of the flange roll 22a and the side surfaces of the horizontal rolls 21a and 21b.
- FIG. 3 is a schematic diagram for explaining the structure of the edger rolling mill 3.
- the edger rolling mill 3 has edger rolls 31a and 31b each having a large diameter roll portion 33 and a small diameter roll portion 32 in the horizontal axis direction.
- the large diameter roll portion 33 guides the web 11 of the material H to be rolled, and the small diameter roll.
- the roll surface (pressed surface) 32a of the portion 32 presses down the end surface 12a of the flange 12 in the width direction.
- the roll diameter of the large diameter roll section 33 and the roll diameter of the small diameter roll section 32 are such that the roll surface of the large diameter roll section 33 is in the thickness direction of the web 11 during rolling of the end face 12a of the flange 12 by the small diameter roll section 32.
- the gap is preferably 2 mm or less.
- FIG. 4 shows a schematic diagram for explaining the structure of the second rough universal rolling mill 4.
- 5 to 9 are also schematic diagrams for explaining the structure of the rough universal rolling mill 4, and are variations of FIG. 4 as described below.
- the second rough universal rolling mill 4 has horizontal rolls 41a and 41b that rotate on the horizontal axis, and rolling rolls 42a and 42b that rotate on the vertical axis.
- the horizontal rolls 41a and 41b and the heel rolls 42a and 42b are arranged to face each other.
- the roll opening degree of the horizontal rolls 41a and 41b is adjusted, the plate
- the circumferential surface c of the saddle roll 42b is arranged in contact with the other side surface b of the horizontal rolls 41a and 41b so that the horizontal rolls 41a and 41b do not move in the axial direction.
- the width (width of the pressed surface) W2 of the roll outer peripheral surface of the horizontal rolls 41a and 41b is substantially the same value as the target inner dimension L (distance from the flange inner surface to the end surface 11a of the web tip) in the intermediate rolling process of the web 11. (That is, W2 ⁇ W1).
- the target internal dimension L of the web 11 in the intermediate rolling process is usually determined by taking into account the slight increase in web height in the finishing universal rolling mill, which is the final rolling process, and is usually used in the T-section steel in the product stage. It is preferable to set a value shorter by about 0 to 5 mm than the dimension.
- the width W2 of the circumferential roll surfaces of the horizontal rolls 41a and 41b be a value smaller by about 0 to 5 mm than the in-web dimension of the T-shaped steel product. Since the widths of the horizontal rolls 41 a and 41 b are the same as the target internal dimension L of the web 11, the scissors roll 42 b comes into contact with the tip of the web 11 and is pressed down to adjust the height of the web 11 and the shape of the end surface 11 a. It becomes possible.
- the corner portion a on the web tip side of the horizontal rolls 41a and 41b is subjected to curved surface processing, chamfering, or a step.
- corners of upper and lower horizontal rolls incorporated in a rough universal rolling mill of a shape steel having a flange such as an H-shape steel are subjected to arc processing in accordance with the shape of the shape steel to be rolled.
- the horizontal roll corner portion is rolled into a shape that does not roll the web surface.
- the shape of the corner part a of the horizontal rolls 41a and 41b is arc-shaped processing (FIGS. 4 and 7), chamfering processing (FIGS. 5 and 8), or step processing (FIGS. 6 and 6). 9) and the like, and a space for rolling the deformed portion of the web surface in the thickness direction of the web due to the increase in the thickness of the web tip is secured.
- the circular arc may be an elliptical arc, and the central angle of the circular arc or elliptical arc is not limited to 90 degrees and can be selected as appropriate. Also, the angle of chamfering is not limited to 45 degrees and can be selected as appropriate. When providing chamfers or steps, it is preferable to round the corners.
- the arc radius in the case of arc processing is 20 mm or more, and in the case of chamfering, the generation of ear-shaped projections can be prevented by performing processing of C 20 or more.
- the width of the step portion is 20 mm or more.
- the upper limit of the processing dimension is preferably such that a web surface of 70% or more of the target internal dimension L in the intermediate rolling process of the web 11 is rolled. That is, it is preferable to set it within 30% with respect to the width W2 of the outer peripheral surface of the horizontal rolls 41a and 41b.
- the web end portion side of the horizontal roll forms an opening larger than the web thickness.
- the opening width d of this opening is preferably about (web thickness + 10 mm) to (web thickness + 200 mm). A more preferable upper limit is about (web thickness + 100 mm). Also in shapes other than the above, it is preferable that the width of the non-rolled portion is 30% of 20 mm to L, and d is in the above range.
- the side b close to the web tip of the horizontal roll 41a (41b) is vertical as shown in FIGS. 4, 5 and 6, and preferably has the same inclination as the side on the flange side as shown in FIGS.
- An angle ⁇ from the vertical may be 5 ⁇ ⁇ 10 °.
- an inclination of the same angle is also provided on the outer periphery of the roll 42b according to the inclination angle, and an up-down symmetrical chevron shape having an inclined hypotenuse with the center in the width direction of the roll surface as a vertex is provided.
- a flat end having a width larger than the web thickness of the material H to be rolled is provided at the center in the width direction of the roll surface that rolls down the web tip.
- first and second rough universal rolling mills it is preferable to perform rolling so that the reduction ratio of the web thickness and the flange thickness is 10 to 30%.
- rolling at a reduction rate of 10% or less may be performed in a specific pass such as the last rolling mill that finishes the intermediate rolling, or the rolled material may be passed without being reduced.
- the second rough universal rolling mill is the last rolling mill that finishes the intermediate rolling
- the web rolling reduction in the finishing universal rolling mill 5 in the next process is small. It is also conceivable to change the process according to the level difference. That is, if the difference in sheet thickness is so large that it cannot be eliminated by finishing rolling by the finishing universal rolling mill 5, the material to be rolled H is fed back and rolled again by the first rough universal rolling mill 2, This can be eliminated by reducing the entire surface in the height direction.
- the intermediate rolling process may be terminated and the finish rolling process may be started.
- the roll opening of the second rough universal rolling mill 4 may be made larger than the dimension of the material H to be rolled, and may be passed without rolling. There is no difference in plate thickness near the tip.
- the crossing angle ⁇ between the flange and the web is preferably 95 ⁇ ⁇ 110 °, more preferably 95 ⁇ ⁇ 100 °, in a cross-sectional view of the material to be rolled as viewed from the rolling direction. Is more preferable.
- the crossing angle prevents the horizontal roll and the inner surface of the flange to be rolled from coming off quickly after rolling, and the generation of wrinkles on the inner surface of the flange. Also, the amount of roll refurbishment when the roll is worn can be reduced, and the roll life is extended.
- the present invention is not limited to the arrangement shown in FIG. 1, and may be any other equipment as long as it has one or more first rough universal rolling mills 2, edger rolling mills 3, and second rough universal rolling mills 4. Any arrangement of can be applied. For example, at least one of the first coarse universal rolling mill, the edger rolling mill, and the second coarse universal rolling mill may be continuously arranged. Further, the arrangement order of the first rough universal rolling mill, the edger rolling mill, and the second rough universal rolling mill is changed, for example, the edger rolling mill and the second rough universal rolling mill are arranged at the beginning of the intermediate rolling process. May be. Furthermore, since each rolling mill is normally capable of reverse rolling or through (passing the rolling mill without rolling), the rolling order does not have to coincide with the rolling mill order.
- FIG. 10 shows a schematic diagram for explaining the structure of the finishing universal rolling mill.
- the finishing universal rolling mill 5 has horizontal rolls 51a and 51b that rotate on the horizontal axis, and roll rolls 52a and 52b that rotate on the vertical axis, and the side surfaces of the horizontal rolls 51a and 51b are orthogonal to the outer peripheral surface of the roll.
- the rolled material in which the crossing angle ⁇ between the flange and the web is larger than 90 ° in the intermediate rolling step in the previous step is formed so that the crossing angle between the flange and the web becomes 90 °.
- the flange of the material to be rolled H is rolled with the roll 52a having a flat outer periphery, the flange is shaped perpendicular to the web.
- the thickness reduction ratio of the flange is preferably a slight reduction of several percent and at most 5%.
- the horizontal rolls 51a and 51b can be prevented from moving in the axial direction by pressing the saddle roll 52b against the side surface of the horizontal rolls 51a and 51b that is not opposed to the flange.
- the web is hardly reduced or lightly reduced by a thickness reduction rate of several percent to the extent that the shape and dimensions are adjusted.
- a thickness reduction rate of several percent to the extent that the shape and dimensions are adjusted.
- the width of the pressed surface of the horizontal rolls 51a and 51b is made larger than the in-web dimension (and thus larger than W2). Preferably, it is about 105 to 150% of the internal dimension of the web 11.
- the manufacturing method and rolling equipment row of the present invention described above are used, a plurality of sizes of T-shaped steels having the same internal dimensions and different flange thicknesses can be manufactured.
- the T-shaped steel having a constant internal dimension has a constant internal web dimension Ai even if the flange thickness tf changes.
- the plate thickness tf of the flange can be adjusted by adjusting the opening between the side roll 42a of the second rough universal rolling mill and one side surface of the horizontal rolls 41a and 41b.
- the circumferential surface c of the eaves roll 42b is arranged in contact with the other side face b of the horizontal rolls 41a and 41b so that the horizontal rolls 41a and 41b do not move in the axial direction.
- the width of the roll outer peripheral surface of the horizontal rolls 41a and 41b is the same as the internal web dimension, the internal web dimension Ai can be rolled to a constant dimension regardless of the flange thickness.
- a certain T-shaped steel can be easily manufactured.
- a T-section steel having a target dimension of a web height of 300 mm, a flange width of 100 mm, a web thickness of 9 mm, and a flange thickness of 16 mm is rolled from a bloom having a rectangular cross section with a thickness of 250 mm and a width of 310 mm. did.
- the 1st rough universal rolling mill 2 used the structure shown to Fig.2 (a).
- the horizontal roll was set to 320 mm so that the width W1 of the pressed surface was wider than the target internal dimension L of the web (283 mm), and the angle ⁇ from the vertical direction of the side surface of the horizontal roll was set to 7 °.
- the left and right saddle rolls are arranged so as to be opposed to each other, and in the cross-sectional shape, a vertically symmetrical mountain shape having a hypotenuse inclined at an angle of 7 ° from the vertical with the center in the width direction of the roll surface as a vertex.
- the pressing force of the one that presses the side surface of the horizontal roll was adjusted so that the horizontal roll would not move in the horizontal axis direction due to the rolling of the flange.
- the edger rolling mill 3 has a structure shown in FIG.
- the step between the large diameter portion and the small diameter portion of the edger roll was 44 mm, and the roll width was ensured to be 500 mm or more for the large diameter portion and 200 mm or more for the small diameter portion.
- the inclination angle of the step portion was set to 7 ° from the vertical.
- the second rough universal rolling mill 4 having the structure shown in FIG. 4 was used.
- the roll shaft of the horizontal roll was not reinforced, and a general structure was used.
- the horizontal roll was 283 mm so that the width W2 of the pressed surface was the same as the web target internal dimension in the intermediate rolling process, and the side surface of the horizontal roll on the side where the flange was rolled was inclined by 7 ° from the vertical.
- the size of the curved surface processing of the horizontal roll corner portion a was an arc shape with a radius of 30 mm (the web end side opening width d of the horizontal roll is the web thickness of the material to be rolled + about 60 mm).
- one of the scissors rolls that rolls the flange with the left and right scissors rolls has a vertically-symmetrical chevron shape having a hypotenuse inclined at an angle of 7 ° from the vertical with the center in the width direction of the roll surface in the cross-sectional shape.
- the other scissors roll that squeezes the tip in the height direction was a cylindrical shape with a flat roll surface.
- the finishing universal rolling mill 5 has a structure shown in FIG.
- the width of the horizontal roll was 320 mm.
- the bloom was rolled with a rough shaping rolling mill 1 (using a double rolling mill incorporating a perforated roll) to obtain a T-shaped steel piece having a substantially T-shaped cross section.
- the obtained T-shaped billet had a web thickness of 40 mm, a flange thickness of 75 mm, a web height of 365 mm, and a flange width of 130 mm.
- reciprocal rolling of 5 passes is performed by a rolling mill group in which the first rough universal rolling mill 2, the edger rolling mill 3, and the second rough universal rolling mill 4 described above are arranged in this order, and the web and the flange are reduced. did.
- Table 1 shows the pass schedule of the intermediate rolling process.
- the web tip was adjusted in the web height direction by using a roll, and the web height was adjusted. At this time, rolling was performed while supporting the axial load of the horizontal roll, with the roll being rolled down the web tip in contact with the side of the horizontal roll. Finally, the finishing universal rolling mill 5 having horizontal rolls and rolls was rolled while applying light pressure to the flanges to shape the inclination of the flanges vertically. The web part was under light pressure. After hot rolling, the web height, flange width, web thickness, and flange thickness of the obtained T-shaped steel were measured. As a result, according to the present invention, the T-shaped steel satisfying the target dimension was heated. It was confirmed that it could be produced as it was rolled. In particular, the web height, which was difficult to adjust with conventional rolling, can be hot-rolled within the range of the target value ⁇ 1 mm, and the end face shape was also good.
- an inner method constant T-shaped steel having the same inner dimension as the flange thickness of 16 mm and a flange thickness of 19 mm was manufactured.
- the dimensions of the T-shaped steel slab after the raw steel slab having the same cross-sectional dimension as that of the flange thickness of 16 mm was rolled by the rough shaping rolling mill 1 were a web thickness of 33 mm, a flange thickness of 75 mm, a web height of 365 mm, and a flange width of 123 mm. It was.
- the web tip was adjusted in the web height direction by using a roll, and the web height was adjusted.
- the roll roll that squeezed the tip of the web was brought into contact with the side surface of the horizontal roll and rolled while supporting the axial load of the horizontal roll.
- the finishing universal rolling mill 5 having horizontal rolls and rolls was rolled while applying light pressure to the flanges to shape the inclination of the flanges vertically.
- the web part was under light pressure.
- the dimensions of each part after hot rolling were as follows: a web height of 303 mm, a flange width of 100 mm, a web thickness of 9 mm, and a flange thickness of 19 mm.
- the in-web dimension was 284 mm and the same value as the product with a flange thickness of 16 mm.
- an intermediate rolling process is performed using a conventional rolling facility (FIG. 14) composed of one rough universal rolling mill in which the width of the pressed surface of the horizontal roll is set wider than the web width and one edger rolling mill.
- T-shaped steel was manufactured. Bloom dimensions and target dimensions for each part after hot rolling of T-shaped steel were the same as the flange thickness of 19 mm of the present invention.
- Table 3 shows the pass schedule for the intermediate rolling process. Since there was only one rough universal rolling mill in the equipment of the comparative example, reciprocating rolling with 9 passes was performed to the target dimension.
- the 1st rough universal rolling mill 2 used the structure shown in FIG.2 (b).
- the horizontal roll was 530 mm so that the width W1 of the pressed surface was wider than the in-web dimension, and the angle ⁇ from the vertical direction of the side surface of the horizontal roll was 7 °.
- the left and right saddle rolls are arranged so as to be opposed to each other, and in the cross-sectional shape, a vertically symmetrical mountain shape having a hypotenuse inclined at an angle of 7 ° from the vertical with the center in the width direction of the roll surface as a vertex.
- the pressing force of the one that presses the side surface of the horizontal roll was adjusted so that the horizontal roll would not move in the horizontal axis direction due to the rolling of the flange.
- the edger rolling mill 3 has a structure shown in FIG.
- the step between the large diameter part and the small diameter part of the edger roll was 67 mm, and the roll width was 550 mm or more for the large diameter part and 200 mm or more for the small diameter part.
- the inclination angle of the step portion was set to 7 ° from the vertical.
- the second rough universal rolling mill 4 having the structure shown in FIG. 4 was used.
- the horizontal roll was 477 mm so that the width W2 of the pressed surface was the same as the web target internal dimension in the intermediate rolling process, and the side surface of the horizontal roll that pressed the flange was tilted by 7 ° from the vertical.
- one of the scissors rolls that rolls the flange with the left and right scissors rolls has a vertically-symmetrical chevron shape having a hypotenuse inclined at an angle of 7 ° from the vertical with the center in the width direction of the roll surface in the cross-sectional shape.
- the other scissors roll that squeezes the tip in the height direction was a cylindrical shape with a flat roll surface.
- the finishing universal rolling mill 5 has a structure shown in FIG.
- the width of the horizontal roll was 520 mm.
- the bloom was rolled into a T-shaped steel slab having a substantially T-shaped cross section by the rough shaping rolling mill 1.
- the obtained T-shaped billet had a web thickness of 50 mm, a flange thickness of 95 mm, a web height of 585 mm, and a flange width of 185 mm.
- the web and the flange were reduced by performing 5 passes of reciprocating rolling in a rolling mill group in which the first rough universal rolling mill 2, the edger rolling mill 3, and the second rough universal rolling mill 4 described above were arranged in this order.
- Table 4 shows the pass schedule of the intermediate rolling process.
- the second rough universal rolling mill 4 rolling was performed in a state where the roll on the web tip side was pressed against the side surface of the horizontal roll, and the web height was adjusted by reducing the web tip in the web height direction. Finally, the inclination of the flange was vertically shaped by a finishing universal rolling mill 5 having a horizontal roll and a roll. After hot rolling, when the web height, flange width, web thickness and flange thickness of the obtained T-shaped steel were measured, the dimensions were as intended, and the web height was within the target value ⁇ 1 mm. The end face shape was also good.
- an intermediate rolling process is performed using a conventional rolling facility including a first universal rolling mill (a), an edger rolling mill, and a second universal rolling mill (b) shown in FIG. T-shaped steel was manufactured.
- Table 5 shows the pass schedule of the intermediate rolling process.
- middle rolling increased about twice, and productivity deteriorated significantly.
- the product dimensions were as planned and there were no problems.
- the T-shaped steel of the present invention can be hot-rolled with a T-shaped steel having a good dimensional accuracy even with a large-sized T-shaped steel having a web height of 500 mm and a flange width of 150 mm. It could be manufactured as rolled, and it was confirmed that the rolling efficiency was significantly improved as compared with the conventional one.
- the T-section steel is effective in which the shape of the web tip is good and the desired web height can be obtained with high accuracy while still being hot-rolled. Manufacturing method and rolling equipment line are obtained, which is very useful industrially.
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Abstract
Description
(1)T形形状に粗成形されたT形鋼片のウェブとフランジとを圧延する中間圧延工程と、前記中間圧延工程で得られたT形鋼片を製品形状とする仕上圧延を行う仕上圧延工程とを有するT形鋼の製造方法であって、
前記中間圧延工程は、上下の水平ロールがウェブの板厚方向における上下面の全面を圧下する第1の粗ユニバーサル圧延機による圧延工程と、
フランジの端面を圧下するエッジャ圧延工程と、
ロール外周面の幅が目標ウェブ内法寸法と同じで、ウェブ先端部側のコーナー部がウェブ面を圧延しない形状に加工された上下の水平ロールを用いて、ウェブを先端部近傍を除いた板厚方向の上下面を圧下しつつ、左右の竪ロールのうち一方の竪ロールがフランジをその板厚方向に圧下し、他方の竪ロールが外周面を上下の水平ロールに接触させつつウェブの端面をウェブの高さ方向に圧下する第2の粗ユニバーサル圧延機による圧延工程と
を有することを特徴とするT形鋼の製造方法。
ロール外周面の幅が前記被圧延材の目標ウェブ内法寸法より広い上下の水平ロールを有する第1の粗ユニバーサル圧延機と、前記被圧延材のフランジの端面を圧下するエッジャ圧延機と、ロール外周面の幅が前記被圧延材の目標ウェブ内法寸法と同じでウェブ先端側のコーナー部がウェブ面を圧延しない形状に加工された上下の水平ロールおよび一方がフランジをその板厚方向に圧下し他方がその竪ロール外周面を上下の水平ロールに接触させつつウェブの端面をウェブの高さ方向に圧下する左右の竪ロールを有する第2の粗ユニバーサル圧延機とが配置されてなることを特徴とするT形鋼の圧延設備列。
1.中間圧延工程のウェブ厚とフランジ厚の圧下を第1と第2の粗ユニバーサル圧延機の両方で実施するため、一基の粗ユニバーサル圧延機で厚みを圧延する場合と比較して、1パス当たりのウェブ厚とフランジ厚の圧下量を大きくすることが可能で、圧延パスを削減し、圧延能率が向上する。 また、第1の粗ユニバーサル圧延機、エッジャ圧延機、第2の粗ユニバーサル圧延機の少なくともいずれかを、複数基配置することにより、更に圧延能率を向上させることができる。
2.第2の粗ユニバーサル圧延機により、水平ロールのフランジ厚を圧下しない方(ウェブ先端側)に竪ロールの外周を接触させて、フランジ厚の圧下による水平ロールの軸方向に作用する圧延反力を支持するとともに、ウェブの端面を高さ方向に圧下することにより、水平ロールの軸方向移動を防止し、寸法精度の良好なT形鋼を圧延することができる。
3.第2の粗ユニバーサル圧延機に用いる水平ロールのウェブ先端側のコーナー部がウェブ面を圧延しない形状に加工されているため、ウェブ先端を圧下しても耳状の突起が形成されることがなく、良好なウェブ先端形状が得られる。
図1は、本発明に係る圧延設備列の一例を示し、図において1は粗造形圧延機、2は第1の粗ユニバーサル圧延機、3はエッジャ圧延機、4は第2の粗ユニバーサル圧延機、5は仕上圧延機を示す。 加熱炉(図示せず)から搬出された素材鋼片(図示せず)は粗造形圧延機1によって断面形状が略T形のT形鋼片に圧延される。 粗造形圧延機1としては、公知の設備が利用でき、例えば、孔型を有するロールが装備された二重式圧延機とする。 得られたT形鋼片を、第1の粗ユニバーサル圧延機2とエッジャ圧延機3と第2の粗ユニバーサル圧延機4が近接して配置された圧延設備列で圧延を行って、ウェブとフランジの圧下を行う(中間圧延工程)。
[実施例2]
2 第1の粗ユニバーサル圧延機
3 エッジャ圧延機
4 第2の粗ユニバーサル圧延機
5 仕上ユニバーサル圧延機
10 T形鋼
11 ウェブ
11a 端面(ウェブ)
12 フランジ
12a 端面(フランジ)
15 耳状の突起
21a,21b 水平ロール
22a,22b 竪ロール
31a,31b エッジャロール
32 小径部
32a 圧下面
33 大径部
41a,41b 水平ロール
42a,42b 竪ロール
51a,51b 水平ロール
52a,52b 竪ロール
W1 第1の粗ユニバーサル圧延機の水平ロールの外周面の幅
W2 第2の粗ユニバーサル圧延機の水平ロールの外周面の幅
L ウェブの目標内法寸法
H 被圧延材(T形鋼片)
a コーナー部
b 側面
c 周面
d 開口幅
Ai、Ai1、Ai2、Ai3:ウェブの内法寸法
Ao、Ao1、Ao2、Ao3:ウェブの外法寸法
tf1、tf2、tf3:フランジ厚
Claims (3)
- T形形状に粗成形されたT形鋼片のウェブとフランジとを圧延する中間圧延工程と、前記中間圧延工程で得られたT形鋼片を製品形状とする仕上圧延を行う仕上圧延工程とを有するT形鋼の製造方法であって、
前記中間圧延工程は、上下の水平ロールがウェブの板厚方向における上下面の全面を圧下する第1の粗ユニバーサル圧延機による圧延工程と、
フランジの端面を圧下するエッジャ圧延工程と、
ロール外周面の幅が目標ウェブ内法寸法と同じで、ウェブ先端部側のコーナー部がウェブ面を圧延しない形状に加工された上下の水平ロールを用いて、ウェブを先端部近傍を除いた板厚方向の上下面を圧下しつつ、左右の竪ロールのうち一方の竪ロールがフランジをその板厚方向に圧下し、他方の竪ロールが外周面を上下の水平ロールに接触させつつウェブの端面をウェブの高さ方向に圧下する第2の粗ユニバーサル圧延機による圧延工程と
を有するT形鋼の製造方法。 - 前記第2の粗ユニバーサル圧延機による圧延工程において、ウェブ端面を圧下する竪ロールの外周面を上下の水平ロールに接触させつつ、もう一方の竪ロールと上下の水平ロール側面との開度を調整することにより、ウェブ内法寸法が一定でフランジ厚が異なる複数のサイズのT形鋼を製造する請求項1に記載のT形鋼の製造方法。
- T形形状に粗成形されたT形鋼片を被圧延材として、そのウェブとフランジとを圧延するT形鋼の圧延設備列であって、
ロール外周面の幅が前記被圧延材の目標ウェブ内法寸法より広い上下の水平ロールを有する第1の粗ユニバーサル圧延機と、前記被圧延材のフランジの端面を圧下するエッジャ圧延機と、ロール外周面の幅が前記被圧延材の目標ウェブ内法寸法と同じでウェブ先端側のコーナー部がウェブ面を圧延しない形状に加工された上下の水平ロールおよび一方がフランジをその板厚方向に圧下し他方がその竪ロール外周面を上下の水平ロールに接触させつつウェブの端面をウェブの高さ方向に圧下する左右の竪ロールを有する第2の粗ユニバーサル圧延機とが配置されてなることを特徴とするT形鋼の圧延設備列。
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