WO2020137317A1 - 不等辺山形鋼の長辺先端面成形装置、長辺先端面成形方法、及び製造方法、並びに熱間仕上圧延設備 - Google Patents
不等辺山形鋼の長辺先端面成形装置、長辺先端面成形方法、及び製造方法、並びに熱間仕上圧延設備 Download PDFInfo
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- WO2020137317A1 WO2020137317A1 PCT/JP2019/046220 JP2019046220W WO2020137317A1 WO 2020137317 A1 WO2020137317 A1 WO 2020137317A1 JP 2019046220 W JP2019046220 W JP 2019046220W WO 2020137317 A1 WO2020137317 A1 WO 2020137317A1
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- long side
- angle steel
- forming
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- tip surface
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- 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
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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
- B21B1/09—L-sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
Definitions
- the present invention relates to a technology for manufacturing unequal helix steel by hot rolling.
- the present invention relates to a technique for forming the tip end surface of the long side of the unequal angle angle steel in a hot state at right angles to the long side.
- the tip surface of the angle steel is also formed by the rolling roll, but the obtained shape accuracy may not be sufficient for the target shape. is there.
- a forming technique for the tip portion of the angle steel there is a technique described in Patent Document 1, for example.
- Patent Document 1 in the hot-rolled unequal angle steel, the short side of the long side is sandwiched between the pressing roll and the receiving roll, and the long side end is guided by the guide roll while the forming part of the forming roll is used. It is described that the short side end portion is pressed.
- the unequal angle steel is used, for example, as a structural material for ships and bridges.
- the ends of the long sides (webs) of the unequal angle angle steel are often directly abutted against other members and welded.
- the perpendicularity (perpendicularity) of the tip surface with respect to the longitudinal direction of the long side has a great influence on the weldability. Therefore, the shape accuracy of the long side end is required to be stricter than the shape accuracy of the short side end.
- the forming processing of the long side end portion is performed as necessary. However, if the forming process is separately performed after the hot rolling process is completed, the number of processes is increased, resulting in an increase in manufacturing cost.
- the technique described in Patent Document 1 is for pressing the short side end portion of the unequal angle angle steel. That is, the technique described in Patent Document 1 is based on the idea of forming the short side end on the same line as the rolling line, and is not the technique of forming the long side end. Generally, the long sides of unequal angle angle steel are thinner than the short sides. Therefore, if the pressing force applied to the end of the long side for forming the end is excessive, the long side may be warped more than necessary. Therefore, the molding technique for the tip of the short side cannot be directly applied to the molding of the tip for the long side. As described above, in order to obtain an appropriate shape for the long side end portion, it is considered necessary to devise a separate device.
- the present invention has been made in view of the above points, and an object thereof is to provide a technique capable of improving the squareness of the long side tip surface of the unequal angle angle steel during hot rolling. ..
- one aspect of the present invention has a forming roll arranged on the outlet side of a hot finish rolling mill for unequal angle steel, and the forming roll is an unequal side formed by finish rolling. It has a peripheral surface that abuts against the tip surface of the long side of the angle steel and presses the tip surface, and the peripheral surface that abuts the tip surface is the longitudinal direction of the long side of the unequal angle angle steel with respect to the tip surface.
- the gist of the present invention is that the tip end face of the long side is press-molded on the peripheral surface of the shape so that a reaction force can be applied toward the.
- FIG. 1 It is a figure which shows the example of the manufacturing process of inequihedral angle steel. It is a conceptual diagram which shows the example of the arrangement position of a long side front end surface shaping
- the unequal angle steel of the present embodiment is manufactured, for example, as shown in FIG. 1, through a manufacturing process including a heating process 1, a rough rolling process 2, an intermediate rolling process 3, and a finish rolling process 4.
- a heating process 1 for example, a steel material that is a rolling material is heated in a batch-type or continuous-type heating furnace.
- the rolled material heated in the heating step 1 is then rolled in the rough rolling step 2, the intermediate rolling step 3, and the finish rolling step 4 to be formed into the shape of the target unequal angle steel.
- the rough rolling step 2, the intermediate rolling step 3, and the finish rolling step 4 include, for example, a hole rolling mill having a hole rolling roll, a universal rolling machine having a plurality of pairs of rolling rolls, and the like.
- a tip surface forming step 4A is provided as part of the finish rolling step 4.
- the front end surface forming step 4A is performed using a long-side front end surface forming device (hereinafter, also simply referred to as a forming device). That is, in the manufacturing process of the unequal helix steel of the present embodiment, as the rolling equipment of the finish rolling process 4, the forming apparatus is provided downstream of the final stand of the hot finish rolling mill that forms the unequal helix steel.
- FIGStructure> 2A and 2B are diagrams showing an example of the arrangement position of the long-side tip surface forming apparatus, in which FIG. 2A is a plan view and FIG. 2B is a front view.
- the molding device 7 is shown in a transparent manner.
- the forming device 7 is installed, for example, on the downstream side of the rolling roll 5 of the final stand in the hot finish rolling mill and at an intermediate position in the rolling direction at the installation position of the side guide 6.
- the forming device 7 of the present embodiment does not have a guide roll that guides the unequal angle angle steel 8 during press forming of the end face. As a result, it is possible to dispose the forming device 7 closer to the rolling roll 5 of the final stand.
- the forming apparatus 7 of the present embodiment has a forming roll 11 arranged on the delivery side of the hot finish rolling mill.
- the forming roll 11 has a slanted peripheral surface 11A that abuts on the tip surface 9A of the long side 9 of the unequal helix steel 8 formed by finish rolling and presses the tip surface 9A, and abuts the tip surface 9A.
- the inclined peripheral surface 11A has a shape capable of applying a reaction force F to the tip surface 9A in the longitudinal direction of the long side 9 of the unequal angle angle steel 8.
- Reference numeral 10 indicates the short side of the unequal angle angle steel 8.
- the inclined peripheral surface 11A comes into contact with the tip surface 9A at an angle of the long side 9 with respect to the longitudinal direction within a range of ⁇ 2 degrees with respect to a right angle orthogonal to the longitudinal direction. It is preferable that it has a surface shape having a possible inclination angle.
- the hole shape of the rolling roll 5 of the final stand has a shape as shown in FIG.
- the angle of the rolling roll 5A that rolls the tip surface 9A of the long side 9 of the unequal angle chevron steel 8 with respect to the horizontal direction is ⁇ . This angle ⁇ is set to an angle at which the front end surface 9A is perpendicular to the long side 9.
- the inclination angle ⁇ of the inclined peripheral surface 11A that abuts against the front end surface 9A in the forming roll 11 with respect to the horizontal is a surface in the range of an angle ⁇ 2 degrees.
- the forming roll 11 is arranged with its central axis (shown by the one-dot chain line in FIG. 3) oriented in the vertical direction, for example, and as shown in FIG. 4, the roll shaft 12 is arranged coaxially with the central axis. .. Thereby, the forming roll 11 is supported by the roll shaft 12 so as to be rotatable about the roll shaft 12.
- the forming roll 11 is configured so that the reaction force F applied to the peripheral surface 11A of the forming roll 11 in the longitudinal direction of the long side 9 of the unequal angle chevron steel 8 has an appropriate size. It has an advancing/retreating mechanism for advancing/retreating the roll shaft 12 of.
- An example of applying an eccentric mechanism will be described below as an example of the advance/retreat mechanism.
- eccentric shafts 13A and 13B extending vertically are integrally provided on the upper end surface and the lower end surface of the roll shaft 12.
- the upper and lower eccentric shafts 13A and 13B are coaxially arranged.
- the roll shaft 12 and the eccentric shafts 13A and 13B are eccentric as shown in the plan view of FIG.
- the lower eccentric shaft 13B is supported by a bottom plate portion 15 that constitutes a part of the side guide 6 via a bearing 14.
- the upper eccentric shaft 13A is supported by the fixed plate 17 via the bearing 16.
- a rotation drive device 18 is connected to the upper eccentric shaft 13A, and by driving the rotation drive device 18, the centers of the eccentric shafts 13A and 13B are rotationally displaced.
- Examples of the rotary drive device 18 include a hydraulic drive device and an electric motor device.
- An eccentric mechanism composed of the eccentric shafts 13A and 13B constitutes an advance/retreat mechanism.
- the rotation driving device 18 supplies a reaction force when the upper eccentric shafts 13A and 13B are rotationally driven to the control unit 19 and also drives the eccentric shafts 13A and 13B by the rotational displacement corresponding to the rotational displacement command from the control unit 19. It is configured to be rotationally driven.
- the control unit 19 operates in a predetermined sampling unit. The control unit 19 controls the reaction force input to the rotary drive device 18 during rotational driving so that the pressing force on the peripheral surface 11A, which is an inclined surface, falls within the preset pressing force range.
- the rotational displacement approaching the range of the reaction force value corresponding to the range is calculated and supplied to the rotary drive device 18.
- the set pressing force range is, for example, a pressing force value that is larger than the size at which the tip end surface 9A can be formed, and that does not bend the long side 9 of the unequal angle angle steel 8 or causes only bending within an allowable range. .. Bending within the allowable range refers to bending within elastic deformation.
- the advancing/retreating mechanism is configured so that the reaction force F applied to the circumferential surface 11A of the forming roll 11 in the longitudinal direction of the long side 9 of the unequal angle chevron steel 8 has an appropriate magnitude.
- This advance/retreat mechanism is not limited to the eccentric mechanism described above.
- a mechanism that adjusts the distance between the unequal angle steel 8 and the roll shaft 12 by linearly translating the roll shaft 12 in the horizontal plane may be used.
- the reaction force F applied to the circumferential surface 11A of the forming roll 11 in the longitudinal direction of the long side 9 of the unequal angle angle steel 8 is set to have an appropriate magnitude.
- An edge sensor (not shown) may be arranged on the exit side of the final stand, and the edge sensor may detect the position in the width direction of the tip surface 9A of the long side 9 in a plan view.
- the control unit 19 calculates the rotational displacement amount according to the target pressing force (range of the set pressing force) based on the detection and supplies the rotational displacement command to the rotary drive device 18.
- the peripheral surface 11A of the forming roll 11 may be a cylindrical surface, and the rotation axis of the forming roll 11 itself may be inclined with respect to the vertical by the same angle as the inclination angle ⁇ .
- the longitudinal direction of the long side 9 and the rotation axis of the forming roll 11 are orthogonal to each other.
- the inclined peripheral surface 11A of the forming roll 11 arranged on the delivery side of the hot finish rolling mill is formed into the unequal angle chevron formed by finish rolling.
- the tip end surface 9A of the long side 9 of the steel 8 is brought into contact with the tip end surface 9A to perform pressure molding.
- the tip surface 9A of the long side 9 of the material to be rolled out from the final stand of the finishing rolling mill is aligned with the longitudinal direction of the long side 9 (axis Direction) to mold.
- the forming roll 11 can be provided close to the rolling roll 5 of the final stand, and also from this point, the guide roll is not required at the time of press forming. The closer they are provided, the more stable the pressing for forming the front end surface 9A becomes. Further, in the present embodiment, the forming roll 11 has an advancing/retreating mechanism in which the peripheral surface 11A that abuts the tip end surface 9A is an eccentric mechanism that advances/retreats in the direction along the longitudinal direction of the long side 9.
- the pressing force for pressing the tip surface 9A of the material to be rolled can be adjusted as needed, and the bending of the material to be rolled coming out of the rolling mill can be reduced. Deflection of the material to be rolled occurs due to a minute variation in the position where the material to be rolled coming out from the exit side of the rolling mill is caught in a roll, a variation in the temperature of the material to be rolled during rolling, and the like. It means that the vehicle is bent in the correct direction.
- the inclination angle ⁇ of the peripheral surface 11A composed of the inclined surface is determined in accordance with the size of the unequal angle steel 8 that is the material to be rolled, and has each inclination angle. Therefore, the forming roll 11 may be prepared according to the type of the angle steel 8 to be manufactured, and the forming roll 11 may be exchanged and used depending on the angle steel to be manufactured. In the present embodiment, the forming roll 11 is movable in the horizontal direction, and by pressing the material to be rolled as necessary, bending of the material to be rolled out from the rolling mill can be reduced. It is possible.
- the forming device 7 including the forming roll 11 by providing the forming device 7 including the forming roll 11, the space saving and the constraint of workability are improved, and the installation position is brought close to the vicinity of the rolling mill, so that the tip surface 9A The moldability of can be improved.
- the formability of the tip surface 9A is improved and the material to be rolled coming out of the rolling mill is rolled. It is also possible to reduce the bending of the material.
- the forming roll 11 should press the tip surface 9A of the long side 9 with a force of 500 kgf or more. Is preferred.
- the pressing force is preferably 1000 kgf or less.
- the distance between the roll axis of the rolling roll 5 of the final stand and the roll axis of the forming roll 11 is such that the rolling roll 5 and the forming roll 11 are not in contact with each other, and in the horizontal plane and on the rolling line. It is preferably within 1200 mm in the direction (vertical direction in FIG. 2A). If the rolling roll 5 and the forming roll 11 are close to each other in this way, the tip surface 9A of the long side 9 of the unequal angle steel 8 as the material to be rolled and the peripheral surface 11A of the forming roll 11 are formed. This is because the likelihood of bending of the material to be rolled is increased, which is allowable for keeping the angle within a desired range with respect to the right angle.
- the forming device 7 of the present embodiment does not have the guide roll that guides the unequal angle angle steel 8 at the time of press forming the end face, unlike Patent Document 1. Therefore, the forming device 7 can be arranged on the downstream side of the rolling roll 5, and the separation distance L between the rolling roll 5 of the final stand and the forming roll 11 can be set within 800 mm, for example.
- the lower limit of the separation distance L can be set to any value as long as it does not interfere with the rolling roll 5 and the forming roll 11. That is, the forming device 7 can be arranged close to the rolling roll 5 within a range where it does not interfere with the rolling roll 5.
- the separation distance L is shortened to, for example, 800 mm or less, it is more preferable since the forming device 7 can form the end portion in a state where the unequal angle steel 8 as the material to be rolled is strongly restrained by the rolling roll 5. Furthermore, the shorter the separation distance L between the forming device 7 and the rolling roll 5, the more the distal end portion or the tail end portion of the unequal angle angle steel 8 where the end portion cannot be formed by the forming device 7. There is also an advantage that the crop length of is shorter than before.
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Abstract
Description
山形鋼の先端部の成形技術としては、例えば特許文献1に記載の技術がある。
特許文献1には、熱間圧延された不等辺山形鋼における、長辺の短辺寄りを押えロールと受けロールによって挟み且つ長辺端部をガイドロールで案内しつつ、成形ロールの成形部によって短辺端部を押圧成形することが記載されている。
従来にあっては、被圧延材の熱間圧延が終了した後の下流工程において、必要に応じ、長辺端部の成形処理が施されていた。しかしながら、熱間圧延の工程の終了後に、別途、成形処理を実施するのは工程が増えるため、製造コストが増加してしまう。
一般に、不等辺山形鋼の長辺は短辺に比べて薄い。このため、端部の成形のために長辺端部に加えられる押圧力が過剰だと長辺が必要以上に反ってしまうおそれがある。したがって、短辺先端部の成形技術をそのまま長辺先端部の成形に転用することはできない。このように、長辺端部について適切な形状を得るためには、別途の工夫が必要と考えられる。
本実施形態の不等辺山形鋼は、例えば図1に示すように、加熱工程1、粗圧延工程2、中間圧延工程3、及び仕上圧延工程4を有する製造工程を経ることによって製造される。加熱工程1においては、例えば、圧延素材である鋼材がバッチ式あるいは連続式加熱炉内で加熱される。加熱工程1で加熱された圧延素材は、次いで、粗圧延工程2、中間圧延工程3、及び仕上圧延工程4において圧延されて、目的の不等辺山形鋼の形状に成形される。粗圧延工程2、中間圧延工程3、及び仕上圧延工程4は、例えば、孔型ロールを有する孔型圧延機や、複数対の圧延ロールを有するユニバーサル圧延機などを備える。
図2は長辺先端面成形装置の配置位置の例を示す図であり、(a)は平面図、(b)は正面図である。図2(b)では、成形装置7を透視的に図示している。
成形装置7は、例えば、図2に示すように、熱間仕上圧延機における最終スタンドの圧延ロール5の下流側であって、サイドガイド6の設置位置における圧延方向途中位置に設置されている。
本実施形態の成形装置7は、特許文献1と異なり、端面の押圧成形時に不等辺山形鋼8をガイドするガイドロールを有しない。その結果、その分、最終スタンドの圧延ロール5に近づけて、成形装置7を配置することが可能となっている。
成形ロール11は、仕上圧延で形成された不等辺山形鋼8の長辺9の先端面9Aに当接して当該先端面9Aを押圧する傾斜した周面11Aを有し、先端面9Aに当接する傾斜した周面11Aは、先端面9Aに対し、不等辺山形鋼8の長辺9の長手方向に向けて反力Fを付与可能な形状となっている。符号10は不等辺山形鋼8の短辺を示す。
ここで、最終スタンドの圧延ロール5の孔型は、図6に示すような形状をしている。その孔型のうち、不等辺山形鋼8の長辺9の先端面9Aを圧延する圧延ロール5Aの孔型の水平方向に対する角度をαとする。この角度αは、先端面9Aが長辺9に対し直角となる角度に設定されている。
成形ロール11は、中心軸(図3では、一点鎖線で示されている)を例えば鉛直方向に向けて配置され、図4のように、その中心軸にロール軸12が同軸に配置されている。これによって、成形ロール11は、ロール軸12を中心にして軸回転可能に当該ロール軸12に支持されている。
ここでは、実施形態は、成形ロール11の周面11Aが不等辺山形鋼8の長辺9の長手方向に向けて付与する反力Fが適切な大きさとなるようにするための、成形ロール11のロール軸12を進退させる進退機構を有する。その進退機構の一例として、偏心機構を適用する例を次に説明する。この場合、そのロール軸12の上端面及び下端面には、上下に延在する偏心軸13A、13Bが一体に設けられている。なお、上下の偏心軸13A、13Bは同軸に配置されている。
下側の偏心軸13Bは、軸受14を介してサイドガイド6の一部を構成する底板部15に支持されている。また、上側の偏心軸13Aは、軸受16を介して固定板17に支持されている。上側の偏心軸13Aには、回転駆動装置18が接続し、回転駆動装置18を駆動することで、偏心軸13A、13Bの中心が回転変位するようになっている。
偏心軸13A、13Bからなる偏心機構が進退機構を構成する。
回転駆動装置18は、上側の偏心軸13A、13Bを回転駆動する際の反力を制御部19に供給すると共に制御部19からの回転変位指令に応じた回転変位分だけ偏心軸13A、13Bを回転駆動するように構成されている。
制御部19は、所定サンプリング単位で作動する。制御部19は、傾斜面からなる周面11Aでの押圧力が予め設定した設定押圧力の範囲に収まるように、回転駆動する際に回転駆動装置18へ入力した反力が、上記設定押圧力の範囲に対応する反力値の範囲に近づく回転変位を演算して、回転駆動装置18に供給する。
上記設定押圧力の範囲は、例えば、先端面9Aを成形可能な大きさ以上で、且つ、不等辺山形鋼8の長辺9が撓まない又は許容以内の撓みだけが生じる押圧力値とする。許容以内の撓みとは、弾性変形内の撓みを指す。
ここで図7に示すように、成形ロール11の周面11Aを円筒面とし、成形ロール11自体の回転軸を、垂直に対し上記傾斜角度θと同じ角度だけ傾けて構成しても良い。この場合には、長辺9の長手方向と成形ロール11の回転軸とが直交する配置となる。
本実施形態では、被圧延材を熱間仕上圧延しているときに、熱間仕上圧延機出側に配置された成形ロール11の傾斜した周面11Aを、仕上圧延で形成された不等辺山形鋼8の長辺9の先端面9Aに当接して、当該先端面9Aの押圧成形を行う。
このとき、被圧延材が熱間仕上圧延で圧延されている状態で、仕上圧延機の最終スタンドから出た被圧延材部分の長辺9の先端面9Aを、長辺9の長手方向(軸方向)に向けて押圧して成形する。
また、成形ロール11を最終スタンドの圧延ロール5に接近して設けることが可能であり、この点からも、押圧成形時にガイドロールが不要となる。接近させて設けるほど、より安定した状態で先端面9Aの成形のための押圧が可能となる。
また、本実施形態では、成形ロール11は、先端面9Aに当接する周面11Aが、長辺9の長手方向に沿った方向に進退する偏心機構からなる進退機構を有する。
このため、本実施形態では、必要に応じて被圧延材の先端面9Aを押圧する押圧力を調整可能となり、圧延機から出てくる被圧延材の出曲りを低減することも可能となる。被圧延材の出曲りは、圧延機の出側から出てきた被圧延材がロールに噛みこまれる位置の微小な変動や、圧延時における被圧延材の温度の変動などの理由で発生し、正しい進行方向に対して曲がった状態になることを指す。
なお、本実施形態では、この成形ロール11は、水平方向に可動であり、必要に応じて被圧延材を押圧することにより、圧延機から出てくる被圧延材の出曲りを低減することも可能である。
以上のように、本実施形態では、成形ロール11からなる成形装置7を設けることで、省スペース化、作業性の制約が改善され、かつ、設置位置を圧延機近傍に近づけることで先端面9Aの成形性を向上させることができる。
ここで、成形するための傾斜面の角度を、長辺9の長手方向に対し直交する直角(90度)±2°以内の範囲に設計することが好ましいのは、次の理由による。
すなわち、傾斜面の角が直角に対して±2°を超えた範囲では、被圧延材に生じた出曲りによって材料通材位置が左右方向に変動した場合、長辺9の先端形状が直角にならない、又は、長辺9の上面あるいは下面に向けて凸形状となるおそれがあるためである。
更に、成形装置7と圧延ロール5との離間距離Lが短いほど、不等辺山形鋼8の先端部や尾端部において、成形装置7により端部の成形ができない最先端部や最尾端部のクロップの長さが従来よりも短くなる、という利点もある。
2 粗圧延工程
3 中間圧延工程
4 仕上圧延工程
4A 先端面成形工程
5、5A 圧延ロール
6 サイドガイド
7 成形装置
8 不等辺山形鋼
9 長辺
9A 先端面
11 成形ロール
11A 周面
12 ロール軸
13A、13B 偏心軸(偏心機構)
18 回転駆動装置
19 制御部
F 反力
Claims (8)
- 不等辺山形鋼用の熱間仕上圧延機出側に配置された成形ロールを有し、
上記成形ロールは、仕上圧延で形成された不等辺山形鋼の長辺の先端面に当接して当該先端面を押圧する周面を有し、
上記先端面に当接する周面は、上記先端面に対し、不等辺山形鋼の長辺の長手方向に向けて反力を付与可能な形状となっていることを特徴とする不等辺山形鋼の長辺先端面成形装置。 - 上記先端面に当接する周面は、上記長辺の長手方向に対する角度が、上記長手方向に直交する直角に対して±2度以内の範囲の角度で先端面に当接可能な面形状となっていることを特徴とする請求項1に記載した不等辺山形鋼の長辺先端面成形装置。
- 上記成形ロールは、上記先端面に当接する周面が、上記長辺の長手方向に沿った方向に進退させる進退機構を有することを特徴とする請求項1又は請求項2に記載した不等辺山形鋼の長辺先端面成形装置。
- 上記成形ロールは竪ロールであり、上記先端面に当接する周面は、成形ロールの回転軸に対し傾斜した傾斜面となっていることを特徴とする請求項1~請求項3のいずれか1項に記載した不等辺山形鋼の長辺先端面成形装置。
- 上記熱間仕上圧延機の最終スタンドの圧延ロールと上記成形ロールとの間の離間距離が800m以内であることを特徴とする請求項1~請求項4のいずれか1項に記載した不等辺山形鋼の長辺先端面成形装置。
- 請求項1~請求項5のいずれか1項に記載の不等辺山形鋼の長辺先端面成形装置を備えた不等辺山形鋼用の熱間仕上圧延設備。
- 請求項6に記載した熱間仕上圧延設備によって不等辺山形鋼を製造することを特徴とする不等辺山形鋼の製造方法。
- 被圧延材を熱間仕上圧延しているときに、熱間仕上圧延機出側に配置された成形ロールの周面を、仕上圧延で形成された不等辺山形鋼の長辺の先端面に当接して、当該先端面の押圧成形を行うことを特徴とする不等辺山形鋼の長辺先端面成形方法。
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