Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
  • B21B1/092—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
  • B21B13/06—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
  • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
  • B21B2203/18—Rolls or rollers
• • 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 steel bar ( ⁇ -bar) by hot rolling, and a rolling facility for producing a T-shaped steel.
• T-section steel 10 is a shape steel bar consisting of a web 1 1 (web) and flange 1 2 (flange) and having a T-shaped cross section.
• T-shaped copper is widely used in fields such as shipbuilding and bridges, and products with various dimensions are manufactured depending on the application, usage conditions, and location of use.
• 1 1 b is the web height
• 1 1 c is the inner height of web
• height is the web thickness
• 1 2 b is the flange width
• 1 2 c is the flange thickness Call.
• T-shaped steel is generally manufactured by welding web 1 1 and flange 1 2, but as a method with better productivity and shape accuracy, T-shaped steel is integrally formed by rolling. Techniques to do this have also been proposed.
• the cross-sectional shape of the T-shaped steel slab is not shown, but it has the shape shown in FIG. 3 of Patent Document 1 and FIG. 6 of Japanese Patent Laid-Open No. 591-180003 (Patent Document 2). Yes.
• the rolling process by the rough universal rolling mill 2 and the edger rolling mill 3 is the intermediate rolling process
• the rolling process by the finishing universal rolling mill 5 is the finish rolling process.
• FIG. 10B schematically shows the configuration of the rough universal rolling mill 2
• FIG. 10C schematically shows the configuration of the edger rolling mill 3
• FIG. 10D schematically shows the configuration of the finishing universal rolling mill 5.
• the rough universal rolling mill 2 has horizontal rolls 2 1 a and 2 l b and vertical rolls 2 2 a and 2 2 b.
• the finishing universal rolling mill 5 has horizontal rolls 5 l a and 5 l b, and rolls 5 2 a and 5 2 b.
• the edger rolling mill 3 has horizontal rolls 3 1 a and 3 1 b, which are composed of a large diameter portion 3 3 and a small diameter portion 3 2.
• the flange width can be adjusted by reducing the end face of the flange 1 2 with the small diameter part 3 2.
• Patent Document 3 discloses a method for efficiently producing T-shaped copper using a triaxial rough rolling mill and a triaxial etcher. After rough rolling, the end face 1 1 a of the web 11 1 and the end face 1 2 a of the flange 1 2 are simultaneously reduced by the triaxial edger 9 shown in FIG. 11 to adjust the height of the web 11. Disclosure of the invention
• the rough universal mill 2 (Fig. 10B) in the intermediate rolling process uses the horizontal rolls 2 1a and 2 1b to feed the T-shaped billet H web. 1 1 is squeezed down in the thickness direction, and roll 2 2 a and horizontal roll The flange 12 of the T-shaped copper piece H is squeezed in the thickness direction between 2 1 a and 2 1 b.
• the edger rolling mill 3 located near the downstream of the rough universal rolling mill 2
• the end face in the width direction of the flange 12 of the T-shaped copper piece H is crushed to reduce the width of the flange 12 Adjust.
• the finish universal rolling mill 5 (Fig. 10 0D) forms the flange 1 2 vertically between the horizontal rolls 5 1 a and 5 1 b and the vertical rolls 5 2 a and 5 2 b.
• the hot rolling of T-shaped copper is finished. Even in this rolling, the web is not rolled down in the height direction.
• the web thickness and the flange thickness are adjusted using the coarse duplex rolling mill 2 in the intermediate rolling process, and the flange end face is reduced by the edge rolling mill 3. Although the flange 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.
• the tip of the web (the end face 1 1 a of the web 11 in FIG. 9) has an arc shape in the cross-sectional shape (cross-sectional shape perpendicular to the longitudinal direction of the product, the same shall apply hereinafter), which is not preferable as the product shape.
• Patent Document 1 describes a technique in which a horizontal roll of a finishing universal rolling mill is provided with a cutting portion and shaped by cutting the end portion of the web in the finishing rolling process.
• the cut part is sag or rounded, a product with a good cross-sectional shape cannot be obtained.
• Patent Document 3 that is, the web 1 1 by the 3-axis edger
• the web height is also adjusted.
• this technique only the end face of the web 11 is constrained during edger rolling. For this reason, when producing a T-shaped copper with a large web height or a small web thickness, if a strong reduction is applied to the web end surface, the web 11 will buckle and the web The height cannot be adjusted accurately.
• an object of the present invention is to provide a method for producing a T-section steel and a rolling equipment which can be obtained in a hot web shape with a good web tip shape and a desired web height with high accuracy.
• 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 squeeze the entire upper and lower surfaces in the thickness direction of the web.
• the edger rolling process to reduce the flange end face, and the upper and lower horizontal rolls down the upper and lower surfaces in the plate thickness direction excluding the vicinity of the web end, and one of the left and right rolls is the end face of the web.
• a rolling process using a second rough universal rolling mill in which the other side is rolled down in the sheet thickness direction and the other side is rolled down in the sheet thickness direction.
• a first rough universal rolling mill having upper and lower horizontal rolls whose width of the round surface is wider than the 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, and a roll Upper and lower horizontal rolls whose width of the surface is narrower than the in-web dimension of the material to be rolled, and one of the left and right rolls that squeezes the flange in the sheet thickness direction and the other squeezes the end face of the web in the web height direction.
• Second coarse with roll A rolling equipment line for T-section steel, characterized in that a universal rolling mill is arranged.
• the web end face of the second rough universal rolling mill is centered in the height direction of the roll, and the bottom is straight and the width is greater than the web thickness.
• Rolling equipment line for T-shaped copper characterized by the formation of grooves.
• the characteristic part of the rolling equipment line of the present invention is preferably the first coarse universal rolling mill, the edger rolling mill, and the second coarse universal rolling mill.
• the width of the horizontal roll that the second coarse universal rolling mill has in order is narrower than the horizontal roll width that the first coarse universal rolling mill has.
• a groove portion having a straight bottom portion is formed in the center portion in the height direction of one of the side rolls of the second rough universal rolling mill.
• the bottom is straight
• the bottom means a groove having a flat bottom. That is, in the roll cross section including the roll center axis, it means that the bottom of the groove is substantially straight.
• FIG. 1 is a diagram showing an example of the arrangement of rolling equipment for T-section steel used in the practice of the present invention.
• FIG. 2 is a schematic diagram illustrating an example of the configuration of the first rough universal rolling mill used in the practice of the present invention.
• 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. 5A is a schematic diagram for explaining another example of the configuration of the second rough universal rolling mill used in the practice of the present invention.
• FIG. 5B is a schematic diagram illustrating still another example of the configuration of the second rough universal rolling mill used in the practice of the present invention.
• FIG. 6 is a schematic diagram illustrating an example of the configuration of a finishing universal rolling mill used in the practice of the present invention.
• FIG. 7 is a diagram showing another example of the arrangement of rolling equipment for T-section steel used in the practice of the present invention.
• FIG. 8 is a diagram showing still another example of the arrangement of rolling equipment for T-section steel used in the practice of the present invention.
• FIG. 9 is a cross-sectional view showing the cross-sectional shape of the T-section steel.
• FIG. 10A is a layout diagram showing conventional rolling equipment for T-section steel.
• FIG. 10B is a diagram for explaining the configuration of the rough universal rolling mill in the rolling equipment shown in FIG. 10A.
• FIG. 10C is a diagram for explaining the configuration of the edger rolling mill in the rolling equipment shown in FIG. 10A.
• FIG. 10D is a diagram for explaining the configuration of the finishing universal rolling mill in the rolling equipment shown in FIG. 10D.
• FIG. 11 is a diagram showing the configuration of a conventional triaxial edger rolling mill for T-shaped copper.
• symbol in each figure is as follows.
• a rolling facility or a part thereof includes a plurality of rolling mills, it is also referred to as a rolling facility row.
• FIG. 1 shows an example of a rolling equipment line according to the present invention.
• 1 is a rough forming mill
• 2 is a first rough universal rolling mill
• 3 is an edger rolling mill
• 4 is a first rolling mill
• 2 is a rough universal rolling mill
• 5 is a finish rolling mill.
• 100 indicates the equipment row to which the intermediate rolling process belongs.
• the raw copper piece (not shown) unloaded from the heating furnace (not shown) is roughly shaped into a T-shaped copper piece (for example, Fig. 3 in Patent Document 1 and Patent Document 2 by a rough shaping rolling mill 1).
• the shape shown in Fig. 6) is rolled.
• the rough shaping rolling mill 1 known facilities (Patent Documents 1, 2, etc.) described in Patent Documents 1, 2, etc. can be used.
• a double rolling mill (2Hi rolling mill) equipped with a roll having a hole shape is suitable.
• the obtained T-shaped copper piece is rolled in a rolling equipment row in which the first rough universal rolling mill 2 and the edger rolling mill 3 and the second rough universal rolling mill 4 are arranged close to each other, and the web and flange (Intermediate rolling process 1 0 0).
• the universal rolling mill has a pair of upper and lower horizontal rolls whose axis extends in the horizontal direction, and a pair of left and right rolling rolls whose axis extends in the vertical direction with respect to the axis of the horizontal roll. It is a name that generally refers to a rolling mill in which the axial centers of these rolls are arranged in the same plane perpendicular to the rolling direction.
• FIG. 2 shows a schematic diagram for explaining the structure of the first rough universal rolling mill 2.
• the first rough universal rolling mill 2 has horizontal rolls 2 1 a and 2 1 b that rotate on a horizontal axis, and rolling rolls 2 2 a and 2 2 b that rotate on a vertical axis.
• the horizontal rolls 2 1 a and 2 1 b and the saddle rolls 2 2 a and 2 2 b are opposed to each other.
• the width W 1 of the pressing surface of the horizontal rolls 2 1 a and 2 1 b is made larger than the internal dimension L of the web 11 (the distance from the flange inner surface to the web tip).
• the entire surface in the height direction of the web 1 1 is squeezed in the plate thickness direction by horizontal rolls 2 1a and 2 1b, and the roll 2 2a and horizontal roll 2 1 On the sides of a and 2 1 b, 'flange 1 2 is pressed down in the thickness direction.
• the thickness of the web 1 1 is adjusted by adjusting the opening between the horizontal rolls 2 1 a and 2 1 b. Thickness adjustment of flange 1 2 is ⁇ roll 2 2 a and horizontal roll 2 1 Adjust the opening between the sides of a and 2 1 b.
• FIG. 3 is a schematic diagram for explaining the structure of the edger rolling mill 3.
• the edger rolling mill 3 has horizontal rolls 3 1 a and 3 1 b having a large diameter roll portion 3 3 and a small diameter roll portion 3 2 in the horizontal axis direction.
• the large-diameter roll part 3 3 guides the web 11 of the material to be rolled H without rolling down, and the small-diameter roll part 3 2 has a round surface 3 2 a which extends the end face 1 2 a of the flange 1 2 in its width direction. Squeeze.
• the diameter of the large diameter roll section 3 3 and the diameter of the small diameter roll section 3 2 are as follows. It is preferable that the roll surface of 3 3 is adjusted so as to have a slight gap between the upper and lower surfaces of the web 11 in the plate thickness direction. By providing a slight gap, the excess rolling reaction force generated when the large-diameter roll part 33 comes into contact with the web is eliminated, and the large-diameter roll part 33 acts as a guide. The effect of aligning the length from the web surface to the top and bottom flange tips is produced, and the dimensional accuracy can be improved. It is preferable to secure a gap of 2 mm or less.
• FIG. 4 is a schematic diagram for explaining the structure of the second rough universal rolling mill 4.
• the second rough universal rolling mill 4 has horizontal rolls 4 1 a and 4 1 b that rotate on the horizontal axis, and rolling rolls 4 2 a and 4 2 b that rotate on the vertical axis.
• the horizontal rolls 4 1 a and 4 1 b and the saddle rolls 4 2 a and 4 2 b are arranged to face each other.
• the width W 2 of the web surface of the horizontal rolls 4 1 a and 4 1 b is made smaller than the internal dimension L of the web 11 (the distance from the flange inner surface to the web tip 1 1 a). (Ie W2 ⁇ W 1).
• the roll opening between the horizontal rolls 4 1 a and 4 1 b is adjusted to adjust the thickness of the web 11.
• the plate thickness of the flange 12 is adjusted by adjusting the opening degree between the heel roll 4 2 a and one side of the horizontal rolls 4 l a and 4 1 b.
• the height of the web 11 and the shape of the end are adjusted by adjusting the opening between the roll 4 2 b and the other side of the horizontal rolls 4 1 a and 4 1 b. adjust.
• a groove portion 43 is provided in the center in the height direction of the heel roll 42b on the web tip side. And are preferred.
• the groove 43 is a straight line with a vertical bottom, and its width a is larger than the web thickness of the material H to be rolled.
• the depth of the groove 43 is determined according to the web height of the T-shaped steel product and the width W 2 of the roll surface of the horizontal roll.
• the shape of the horizontal rolls 41a and 41b may be vertical on the side close to the web tip as shown in Fig. 5A, and on the side near the web tip as shown in Fig. 5B.
• the horizontal rolls 4 1 a and 4 1 b The majority (ie, not near the tip 11a) is rolled in the web thickness direction. Therefore, even if the web tip 1 1 a is strongly squeezed by the heel roll 4 2 b, the web 11 does not buckle. However, if the width of the horizontal rolls 4 1 a and 4 1 b is narrow, the unrolled portion of the web becomes longer and buckling is likely to occur. Therefore, the width of the web surface is at least 7 It is preferably 0%.
• the vicinity of 20 mm or more in the vicinity of the web end is set as the non-pressed area.
• the intermediate rolling process using the first rough universal rolling mill 2, the ezja rolling mill 3, and the second rough universal rolling mill 4 described above as necessary until a shape capable of finish rolling is obtained. Perform reciprocating rolling.
• the web 11 when the web 11 is rolled in the plate thickness direction by the second rough universal rolling mill 4, the part that is squeezed by the horizontal rolls 4 1 a and 4 1 b and the part that is not squeezed (the web tip 1 1 a In the vicinity), there may be a difference in plate thickness. If the difference in sheet thickness is so large that it cannot be eliminated by finishing rolling with the finishing mill 5, the material to be rolled H is fed back and rolled again with the first rough universal rolling mill 2 to obtain the height of the web. All that is necessary is to reduce the entire direction.
• the intermediate rolling process is finished and the finish rolling process is started.
• the opening degree of the second rough universal rolling mill 4 may be made larger than the dimension of the material H to be rolled and passed without rolling. In this case, there is no difference in plate thickness near the web tip.
• the crossing angle (0 f in FIG. 2) of the flange and the web is 95 to 100 ° in a cross-sectional view of the material to be rolled as viewed from the rolling direction.
• the angle between the flange and the web is 9 5 to 100.
• the side surface of the horizontal roll is tilted so that the angle (0 in Fig. 2) is 5 to 10 ° from the vertical direction.
• the saddle roll has a vertically symmetrical mountain shape with a hypotenuse inclined at an angle of 0: 5 to 10 ° from the vertical, with the center in the width direction of the roll surface as the apex in the cross-sectional shape (Figs. 2, 4 and 4).
• the web thickness and flange thickness per pass are compared with the case of rolling by one rough universal rolling mill. It is possible to increase the amount of reduction. Therefore, rolling passes are reduced and rolling efficiency is improved.
• the T-shaped steel can be efficiently intermediate-rolled.
• the rolling equipment row is preferably arranged in the order of the first coarse universal rolling mill, the edger rolling mill, and the second coarse universal rolling mill, but it is not limited to this.
• an edger rolling mill or a second rough universal rolling mill may be arranged at the beginning of the intermediate rolling process.
• the rolling order may not coincide with the rolling mill order.
• a plurality of at least one of the first rough universal rolling mill, the wedge rolling mill, and the second rough universal rolling mill may be arranged.
• FIGS. 7 and 8 it is possible to place a plurality of sets of configurations including a first rough universal rolling mill 2, an edger rolling mill 3 and a second rough universal rolling mill 4.
• FIG. 7 shows a configuration in which two sets of a first rough universal rolling mill 2, an ezja rolling mill 3 and a second rough universal rolling mill 4 are arranged.
• Fig. 8 shows the first rough universal rolling mill 2, the edger rolling mill With the configuration in which 3 sets of 3 and the second rough universal rolling mill 4 are arranged, the intermediate rolling process can be completed in one pass, and the rolling efficiency is dramatically improved.
• the present invention is not limited to the arrangement shown in FIGS.
• at least one of the first rough universal rolling mill, the edger rolling mill, and the second rough universal rolling mill is continuously arranged to increase efficiency.
• any other sequence can be selected.
• any other arrangement can be applied as long as it has one or more first rough universal rolling mills 2, edge rolling mills 3 and second rough universal rolling mills 4. it can.
• Fig. 6 shows a schematic diagram illustrating the structure of the finishing universal rolling mill.
• the finishing mill 5 has horizontal rolls 5 1 a and 5 1 b rotating on the horizontal axis, and firewood rolls 5 2 a and 5 2 b rotating on the vertical axis, and the horizontal roll 5 1 a And the side of 5 1 b is orthogonal to the roll surface.
• the flange When rolling the flange of the material H to be rolled with the roll 5 2 a, the flange is shaped perpendicular to the roll.
• the horizontal rolls 5 1 a and 5 2 b can be prevented from moving in the axial direction by pressing the roll 5 2 b against the side of the horizontal rolls 5 1 a and 5 2 b that is not opposed to the flange.
• the web is almost unrolled, or is lightly rolled to the extent that the shape and dimensions are adjusted (the rolling reduction is over 0% to 3%).
• the width of the flank of the horizontal rolls 51a and 52b (not labeled) is greater than the web internal dimension L (and thus greater than W2).
• T-shaped steel dimensions are: web height: about 200 to 100 mm, web thickness: about 8 to 25 mm, internal web dimensions: about 190 to 98 mm Flange width: about 80 to 400 mm, flange thickness: about 12 to 40 mm. However, the web thickness and flange thickness during intermediate rolling may be thicker.
• the width W 1 of the horizontal roll of the finishing universal rolling mill for rolling T-shaped steel and the first coarse universal annual milling machine is about 2 10 to 1 100 mm (however, It is preferable that the size is about 10 5 to 1 50% of the in-web dimension.
• the width (W 2) of the horizontal roll of the second rough universal rolling mill is preferably about 140 to 95 mm (however, about 70 to 95% of the in-web dimension of the material to be rolled). .
• the difference between W 1 and W 2 is preferably 30 mm or more.
• the groove width is preferably about 20 to 100 mm depending on the web thickness, and the depth is preferably about 5 to 100 mm.
• the amount of reduction at the web edge is preferably about 1 to 5%.
• the method and equipment of the present invention are suitable for producing shipbuilding T-section steel.
• the height of the web is about 20 to 100 mm
• the flange width is about 80 to 25 mm
• the web height is more than twice the flange width.
• Many of the T-shaped steels for shipbuilding are conventionally manufactured by welding, but according to the method and equipment of the present invention, they can be easily and accurately manufactured by rolling.
• the tube height is 300 mm
• the flange width is 100 mm
• T-shaped steel suitable for shipbuilding with a target thickness of 9 mm web and flange thickness of 16 mm was rolled.
• the first rough universal rolling mill 2 has a structure shown in FIG.
• the horizontal hole was 3 20 mm so that the width W 1 of the pressed surface was wider than the web dimension.
• the angle 0 from the vertical direction of the side 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 was adjusted so that the horizontal roll would not move in the horizontal axis direction due to rolling of the flange.
• a second rough universal rolling mill 4 having the structure shown in FIG. 4 was used.
• a thrust roller bearing is incorporated into the horizontal roll's round shaft, making it resistant to loads in the round shaft direction.
• the horizontal roll was 2500 mm so that the width W 2 of the squeezed surface was narrower than the internal dimension of the web, and the side of the horizontal roll on the side where the flange was rolled was tilted by 7 ° from the vertical.
• the left and right saddle rolls one of which is a flange that rolls the flange, has a vertically symmetrical chevron shape with an oblique side 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 web tip in the height direction was a cylindrical shape with a flat roll surface.
• the edger rolling mill 3 has the structure shown in FIG.
• the level difference between the large-diameter part and the small-diameter part of the horizontal roll was 44 mm, and the width of the mouth was secured at 500 mm or more for the large-diameter part and 200 mm or more for the small-diameter part.
• the slope of the step is 7 degrees from the vertical. It was.
• a finishing universal rolling mill 5 having the structure shown in FIG. 6 was used.
• the width of the horizontal roll was 3 20 mm.
• the above-mentioned bloom was rolled with a rough shaping rolling mill 1 (using a double rolling mill incorporating a hole roll) to obtain a T-shaped billet 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 375 mm, and a flange width of 130 mm.
• the first rough universal rolling mill 2, the edger rolling mill 3, and the second rough universal rolling mill 4 described above were reciprocally rolled in 5 passes by a group of rolling mills arranged in this order, and the web and flange Was reduced.
• the web height was adjusted by using a roll to reduce the web tip in the web height direction.
• the inclination of the flange was shaped vertically by a finishing universal rolling mill 5 having horizontal and rolls.
• the web section was lightly pressed.
• the web height, flange width, web thickness and flange thickness of the obtained T-shaped steel were measured.
• the T-shaped steel meets the target dimensions according to the present invention with the target dimensions. It was confirmed that can be produced as hot rolled.
• the web height which was difficult to adjust with conventional rolling, can be hot-rolled within the range of the target soil l.mm, and the end face shape was also good (here, When viewed from the cross-sectional shape, the end face almost matches a straight line perpendicular to the web height direction, and the angle between the end face and the top and bottom faces of the web is a right angle).
• the conventional rolling equipment (Fig. 1) consists of one rough universal rolling mill and one edger rolling mill, in which the rolling width of the horizontal roll is set wider than the web width. 0) was used to produce a T-section steel. Bloom dimensions and target dimensions of each part after hot rolling of T-shaped steel were the same as in the present invention. Since the comparative equipment has only one rough universal rolling mill, reciprocating rolling with 9 passes was performed to the target dimension.
• the tip of the web could not be crushed, so the web height was higher than the target 300 mm, and it was about 30 06 mm, resulting in out-of-dimensions. For this reason, it became necessary to cut the edge of the web after rolling, which increased time and cost and increased manufacturing costs.
• the rolling time of intermediate rolling compared to the examples of the present invention Has doubled and productivity has deteriorated significantly.
• the width of the horizontal nozzle of W 1 and the finishing universal rolling mill was changed to 3400 mm, respectively, but the results were good.
• a rough universal rolling mill having slopes on both sides of the horizontal roll shown in FIG. 5B is used for the second rough universal rolling mill.
• T-shaped copper having the same dimensions as in the first example was rolled.
• the same equipment as in the first example was used for the rough shaping rolling mill 1, the first-first rough universal rolling mill, and the edger rolling mill 3.
• the horizontal roll bearing of the second rough universal rolling mill 4 was not a special bearing as in the first embodiment but a normal one. As a result, equipment costs were saved. .
• the horizontal roll was set to 2 50 mm so that the width W 2 of the squeezed surface was narrower than the in-web dimension, and the side of the horizontal roll on the side where the flange was rolled was tilted by 7 ° from the vertical.
• the saddle roll has a symmetrical mountain shape with 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.
• a straight groove portion having a depth of 34 mm (depth from the surface of the heel roll) and a width of 100 mm was provided on the heel roll 42b on the web tip side.
• T-shaped steel In the manufacture of T-shaped steel, first, a bloom having the same dimensions as in the first example was rolled with a rough shaping rolling mill 1 to obtain a 'T-shaped steel slab having a substantially T-shaped cross section.
• the dimensions of the obtained T-shaped slab were the same as in the first example, with a web thickness of 4 Om, a flange thickness of 75 mm, a web height of 3 75 mm, and a flange width of 130 mm.
• the web and the flange were crushed by performing 5 passes of reciprocating rolling in a rolling mill group in which the first coarse universal rolling mill 2, the edger rolling mill 3, and the second coarse universal rolling mill 4 were arranged in this order. .
• the web roll height was adjusted by rolling the roll at the web tip side against the side of the horizontal roll and reducing the web tip in the web height direction.
• the flange inclination was shaped vertically by a finisher dual rolling mill 5 having a horizontal roll and a roll.
• the web height, flange width, web thickness, and flange thickness of the obtained T-shaped copper were measured and found to be the target dimensions.
• the web height was within the target value ⁇ 1 mm.
• the end face shape was also good. Based on the above results, T-shaped steel with good dimensional accuracy is produced as hot-rolled with the T-shaped steel production method and rolling equipment using the second rough universal rolling mill shown in Fig. 5B of the present invention. I was able to confirm that it was possible.
• the target dimensions are: web height 500 mm, flange width 15 500 mm, web thickness 12 mm, flange thickness 22 mm T-shaped copper rolled. That is, in the intermediate rolling process in the third embodiment, the second rough universal rolling mill 4, the edger rolling mill 3, and the first rough universal rolling mill 2 are arranged in this order.
• the second rough universal rolling mill 4 used had a structure having slopes on both sides of the horizontal roll shown in FIG. 5B.
• the horizontal roll was 4 4 O mm so that the width W 2 of the pressed surface was narrower than the in-web dimension, and the side of the horizontal roll was tilted 7 ° from the vertical.
• the cross-sectional shape of the reed roll is a vertically symmetrical chevron shape with a hypotenuse inclined at an angle of 7 ° from the vertical centered at the center of the roll surface in the width direction.
• a straight groove having a depth of 37 mm and a width of 100 mm was provided.
• the edger rolling mill 3 has the structure shown in FIG.
• the level difference between the large-diameter part and the small-diameter part of the horizontal roll is 68 mm.
• the slope of the step was set to 7 ° from the vertical.
• the first rough universal rolling mill 2 has a structure shown in FIG.
• the horizontal hole was set to 5 30 mm so that the width W 1 of the pressed surface was wider than the in-web dimension, and the angle 0 from the vertical direction of the side surface of the horizontal roll was 7 °.
• the saddle rolls were arranged so as to face 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 the apex.
• the pressing force was adjusted so that the horizontal roll would not move in the horizontal axis direction due to the rolling of the flange.
• a finishing universal rolling mill 5 having the structure shown in FIG. 6 was used.
• the width of the horizontal roll was 5 ⁇ 20 mm.
• the bloom was rolled with a rough shaping rolling mill 1 (using a double rolling mill incorporating a hole roll) to obtain a T-shaped copper piece having a substantially T-shaped cross section.
• 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 second rough universal rolling mill 4, the edger rolling mill 3, and the first rough universal rolling mill 2 described above were reciprocally rolled in 5 passes by a group of rolling mills arranged in this order, and the web and flange was reduced.
• the second rough universal rolling mill 4 rolling was performed with the roll at the tip of the roll pressed against the side of the horizontal roll, and the web height was adjusted by reducing the web tip in the web height direction. Finally, the flange inclination was shaped vertically by a finishing mill 5 having a horizontal roll and a vertical roll.
• the web height, flange width, web thickness and flange thickness of the T-shaped steel obtained were measured, and the dimensions were as planned.
• the web height was within the target value ⁇ lmm.
• the end face shape was also good. From the above results, it is possible to obtain good dimensional accuracy even with a large T-shaped steel such as a web height of 500 mm and a flange width of 150 mm with the T-shaped copper manufacturing method and rolling equipment of the present invention. It was confirmed that T-shaped copper could be produced as hot rolled.
• a web having a web height that satisfies the target value can be obtained while maintaining the hot rolling, the end shape being good, and after the hot rolling. There is no need to cut the web tip. Since the cutting process is unnecessary, the manufacturing process can be shortened and the manufacturing cost can be reduced, which is extremely useful in the industry.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

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• 2008
  • 2008-05-21 JP JP2008132900A patent/JP4453771B2/ja not_active Expired - Fee Related
  • 2008-05-29 WO PCT/JP2008/060324 patent/WO2008146948A1/ja not_active Ceased
  • 2008-05-29 KR KR1020107007821A patent/KR101084617B1/ko not_active Expired - Fee Related
  • 2008-05-29 CN CN2008800181739A patent/CN101678413B/zh not_active Expired - Fee Related
  • 2008-05-29 KR KR1020097024541A patent/KR100975818B1/ko not_active Expired - Fee Related

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