WO2014156045A1 - 異厚鋼板の圧延方法および圧延装置 - Google Patents
異厚鋼板の圧延方法および圧延装置 Download PDFInfo
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- WO2014156045A1 WO2014156045A1 PCT/JP2014/001507 JP2014001507W WO2014156045A1 WO 2014156045 A1 WO2014156045 A1 WO 2014156045A1 JP 2014001507 W JP2014001507 W JP 2014001507W WO 2014156045 A1 WO2014156045 A1 WO 2014156045A1
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2205/00—Particular shaped rolled products
- B21B2205/02—Tailored blanks
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- the present invention relates to a rolling method and a rolling apparatus for manufacturing a thick steel part and a different thickness steel plate having a thick part and a thin part having a different thickness in the longitudinal direction.
- the required product steel plate length may not be ensured as a result of variations in slab cutting accuracy and variations in rolling accuracy. In such cases, the final cut product in the same slab is generally rejected due to insufficient length. Therefore, if the yield is set low in advance by giving an extra length, the failure rate due to insufficient length can be reduced. Since the yield and the failure rate due to lack of length are in a trade-off relationship, the yield is generally set so that the total loss is minimized. On the other hand, in different thickness rolling, it is necessary to secure a length that enables the product steel plate to be collected at each of the thick part and thin part, that is, to allocate an appropriate margin length to each of the thick part and thin part. There is.
- Patent Document 1 As a conventional rolling method for different thickness steel plates, for example, the technique of Patent Document 1 is known.
- the rolled steel sheet is primarily rolled according to a thick product steel sheet to form a thick portion, and then secondary rolled according to a thin product steel sheet. This is a method of rolling different thickness rolling by forming a thin portion.
- the actual side cross-sectional area of the steel sheet is obtained after the primary rolling, and the actual side cross-sectional area is compared with a predetermined side cross-sectional area of a side surface necessary for obtaining a preset product steel sheet.
- the thickness (actual thickness) of the thick portion of the different thickness steel plate is determined after the primary rolling.
- the actual side cross-sectional area is compared with the planned side cross-sectional area using the planned thickness of the thick part described above, and the rolling length of the thin part is corrected. The difference between the actual thickness and the planned thickness is not considered. Therefore, Patent Document 1 cannot calculate an excess side cross-sectional area between an actual lateral area and an estimated lateral area with high accuracy, and does not have a thick wall portion or a thin wall portion. Since the optimum margin length cannot be distributed to the part, the yield of the different thickness steel sheets may be reduced.
- This invention is made
- a rolling method for different thickness steel sheets has the following characteristics.
- the steel sheet to be rolled is primarily rolled to match the thick product steel sheet to form a thick part, and then subjected to secondary rolling to the thin product steel sheet to form a thin part.
- the margin length of the thin portion is calculated, Calculate the rolling length of the thin part so that the surplus side cross-sectional area is distributed to the thick part and the thin part according to the margin length of the thin part, A rolling method for different thickness steel plates, wherein secondary rolling is performed with the calculated rolling length of the thin portion.
- the actual side cross-sectional area of the thick wall portion is the actual thickness of the thick wall portion based on the actual thickness of the thick wall portion calculated by the gauge meter plate thickness and the signal value obtained from the pulse generator connected to the work roll.
- the margin length of the thin portion exceeds the allowable upper limit value, half of the allowable upper limit value is set as the margin length of the thick portion, and the remaining half of the allowable upper limit value is set as the thin portion. [1] or [2].
- the steel sheet to be rolled is primary-rolled according to the thick product steel sheet to form a thick part, and then secondary rolled to the thin product steel sheet to form a thin part.
- the marginal length of the thin portion is calculated based on the actual cross-sectional area of the thick portion calculated during primary rolling, and an excess side sectional area is provided in the thick portion and the thin portion according to the margin length of the thin portion.
- the actual side cross-sectional area of the thick wall portion is the actual thickness of the thick wall portion based on the actual thickness of the thick wall portion calculated by the gauge meter plate thickness and the signal value obtained from the pulse generator connected to the work roll.
- the margin of the thin portion is calculated based on the actual cross-sectional area of the thick portion calculated at the time of primary rolling, and the thickness is increased according to the margin length of the thin portion. Since the rolling length of the thin part is calculated so that the surplus side cross-sectional area is distributed to the part and the thin part, and the secondary rolling is performed with the calculated rolling length of the thin part, the margin length of the thin part Can be calculated with high accuracy, and the surplus side cross-sectional area can be allocated to the thick and thin portions in proportion to the margin of the thin portion, thus improving the yield of different thickness steel plates. Can do.
- FIG. 1 is a schematic view showing a reversible rolling mill according to the present invention.
- FIG. 2 is a diagram showing the flow of the rolling method for different thickness steel sheets according to the present invention.
- FIG. 3 is a diagram showing the shape of the thick portion after primary rolling and the shape of the different thickness steel plate after secondary rolling according to the present invention.
- FIG. 4 is a flowchart showing a rolling length setting process for a thin portion according to the present invention.
- FIG. 1 shows a reversible rolling mill 1 that obtains a different thickness steel plate by rolling a slab S. As shown in FIG. 1
- the rolling mill 1 includes upper and lower work rolls 2 and upper and lower backup rolls (backup roll) 3.
- the opening (roll ⁇ gap) between the upper and lower work rolls 2 is adjusted by the opening changing mechanism 4.
- the opening changing mechanism 4 changes the setting of the opening in each pass according to an opening command from the controller 5.
- the rolling load at the time of rolling is detected by a load cell 6 and the detected value is output to the controller 5.
- Reference numeral 8 denotes a plate width meter that measures the plate width of the thick portion Y described later.
- Reference numeral 9 denotes a table roll that conveys the slab S toward the work roll 2.
- a first pulse generator 7 is attached to the work roll 2, and the number of pulses generated by the first pulse generator 7 corresponding to the rotation of the work roll 2 is output to the controller 5.
- a second pulse generator 10 is attached to the table roll 9, and the number of pulses generated by the second pulse generator 10 corresponding to the rotation of the table roll 9 is output to the controller 5.
- FIG. 2 is a diagram illustrating a flow of the rolling method for different thickness steel plates according to the present embodiment.
- first longitudinal rolling for obtaining a plurality of thick product steel plates by performing primary rolling of the slab S with the upper and lower work rolls 2.
- a thick part Y having a uniform thickness in the direction is formed.
- secondary rolling to the middle of the longitudinal direction of the thick part Y by the upper and lower work rolls 2, the thick part Y, the thin part X for obtaining a plurality of thin steel plates, and the thickness
- a different thickness steel plate 11 having a stepped portion Z between the meat portion Y and the thin portion X is formed.
- FIG. 3 is a view showing the shape of the thick portion Y after the primary rolling and the shape of the different thickness steel plate 11 after the secondary rolling
- FIG. 4 is a flowchart showing the rolling length setting process of the thin portion.
- the rolling length setting process of the thin wall portion in FIG. 4 is performed in step ST1 with the crop lengths ⁇ Lf and ⁇ Lt at the front and rear ends of the thick wall portion Y after the primary rolling, the actual cross-sectional area Sj, and the step portion of the different thickness steel plate 11.
- Z length (stepped portion length) D is calculated.
- the step length D of the step portion Z is extracted from data corresponding to the product thickness of the thick portion Y and the thin portion X of the different thickness steel plate 11 stored in advance.
- the controller 5 detects the end of rolling based on the rolling load measurement value from the load cell 6, the controller 5 starts the pulse count from the second pulse generator 10, and the thickness after rolling based on the plate width measurement value from the plate width meter 8.
- the pulse count from the second pulse generator 10 is stopped, and the pulse count number Ct during that time is set.
- a preset unit length (mm / pulse) It of pulse, and a distance R between the center line of the work roll 2 and the plate width meter 2 a thick wall as shown in the following equation (2).
- the rear end side crop length ⁇ Lt of the part Y is calculated and stored.
- ⁇ Lt Ct ⁇ It ⁇ R (2)
- the control controller 5 When the control controller 5 detects the end of the primary rolling based on the signal from the load cell 6, the control controller 5 stops counting the pulses from the first pulse generator 7, and calculates the pulse count number Cm from the rolling start time to the end time of the primary rolling.
- the control controller 5 Based on the stored pulse count Cm, the advanced rate F set in advance, and the unit length (mm / pulse) Im of the pulse, the total length L of the thick portion Y after the primary rolling is calculated as shown in the following equation (4).
- L Cm ⁇ (1 + F) ⁇ Im (4)
- the controller 5 calculates and stores the actual cross-sectional area Sj as shown in the following equation (5), with the stored gauge meter plate thickness T as the actual thickness and the total length L of the thick portion Y as the actual length.
- Sj T ⁇ L (5)
- the cross-sectional area of the side surface of the thick part Y of the thick part Y after the primary rolling is the actual cross-sectional area Sj.
- This actual side cross-sectional area Sj is the sum of a predetermined side cross-sectional area Sy and a surplus side cross-sectional area Sa necessary for obtaining a preset product steel plate.
- the target thickness Tx of the thin portion X is calculated.
- the target thickness Tx of the thin portion X is slightly larger than the thickness of the product steel plate of the thin portion X.
- step ST3 the actual cross-sectional area Sj, the product length Ly of the thick portion Y, the rear end side crop length ⁇ Lt of the thick portion Y, the step length D of the step portion Z, the gauge meter plate thickness T, and the thin portion X are aimed.
- the rolling length LXc of the temporary thin portion is calculated by the coefficient K taking into account the thickness Tx and thermal expansion, as shown in the following formula (6).
- LXc (Sj ⁇ (Ly + ⁇ Lt + D) ⁇ K ⁇ T) / (Tx ⁇ K) (6)
- step ST4 the rolling length LXc of the temporary thin portion, the coefficient C set as a predetermined ratio with respect to the thickness of the thin portion X, and the coefficient as compensation for variations in the rear end side crop of the thick portion Y From D, the margin length Lya of the thick portion Y is calculated as shown in the following equation (7).
- Lya LXc ⁇ C + D (7)
- step ST5 the product length Ly of the thick part Y, the rear end side crop length ⁇ Lt of the thick part Y, the step part length D of the step part Z, the coefficient K considering thermal expansion, and the margin of the thick part Y
- the rolling length LY of the thick portion Y is calculated as shown in the following equation (8).
- LY (Ly + ⁇ Lt + D) ⁇ K + Lya Equation (8)
- step ST6 the following equation (9) is obtained by using the actual side sectional area Sj, the rolling length LY of the thick portion Y, the gauge meter plate thickness T, the target thickness Tx of the thin portion X, and the coefficient K considering thermal expansion.
- the rolling length LX of the thin part X is calculated.
- step ST7 the rolling length LX of the thin part X, the product length Lx of the thin part X, the tip side crop length ⁇ Lf of the thick part Y, the step part length D of the step part Z, and the predetermined ratio to the thickness of the thin part X
- the margin length Lxa of the thin portion X is calculated using the coefficient C set as follows.
- Lxa LX ⁇ (Lx + ⁇ Lf + D) ⁇ (1 + C) Expression (10)
- step ST8 the margin length Lxa of the thin portion X calculated in step ST7 is compared with the allowable lower limit Lmin (for example, 500 mm) of the rolling length of the thin portion X.
- the allowable lower limit Lmin for example, 500 mm
- the process proceeds to step ST9 and the first margin allocation process is performed.
- the margin length Lxa of the thin portion X is equal to or larger than the allowable lower limit Lmin, the process proceeds to step ST10.
- step ST10 a comparison is made between the margin length Lxa of the thin portion X and the allowable upper limit value Lmax (for example, 1000 mm) of the rolling length of the thin portion X. If the margin length Lxa of the thin portion X is equal to or less than the allowable upper limit Lmax of the rolling length of the thin portion X as determined in step ST10, the process proceeds to step ST11 to perform the second margin allocation process. When the margin length Lxa of the part X exceeds the allowable upper limit Lmax of the rolling length of the thin part X, the process proceeds to step ST12 and the third margin allocation process is performed.
- Lmax for example, 1000 mm
- step ST9 since the margin length Lxa of the thin portion X is a small value, the rolling length LX of the thin portion X calculated by Expression (9) is set. It transfers to step ST13 and the rolling length LX of the thin part X is output as the rolling control value Sx of a thin part.
- the rolling length LY of the thick portion Y is recalculated as shown in the following formula (11) using the coefficient K and the gauge meter plate thickness T in consideration of thermal expansion.
- LY LY + (Lxa ⁇ Lmin) / 2 ⁇ (Tx ⁇ K) / T (11)
- the rolling length LX of the thin portion X is recalculated as shown in the following equation (14) based on the rolling length LX of the thin portion X and the allowable upper limit Lmax.
- LX LX ⁇ Lmax / 2 Formula (14)
- half of the allowable upper limit value Lmax is set as the margin length of the thick portion Y
- the remaining half of the allowable upper limit value Lmax is set as the margin length of the thin portion X.
- step ST13 It transfers to step ST13 and the rolling length LX of the thin part X is output as the rolling control value Sx of a thin part.
- the controller 5 Based on the rolling length LX of the thin portion X calculated by the first margin distribution process in step ST9, the second margin distribution process in step ST11, or the third margin distribution process in step ST12, the controller 5 Different thickness steel plate having thick portion Y, thin portion X for obtaining a plurality of thin steel plates, and stepped portion Z between thick portion Y and thin portion X by performing next rolling 11 is formed.
- the first to third margin allocation processes are performed according to the margin length Lxa of the thin part X (step ST7 to step ST12 in FIG. 4).
- the surplus area is allocated to the thick part Y and the thin part X according to the margin length Lxa of the thin part X, problems such as insufficient length of the thick part Y and the thin part X are prevented.
- the different thickness steel plate 11 can be manufactured while greatly reducing the yield.
- the actual side cross-sectional area Sj is calculated from the measured values of the load cell 6, the first and second pulse generators 7 and 10, and the thin-walled portion is calculated based on the actual side cross-sectional area Sj. Since the margin length Lxa of X is calculated, the surplus area to the thick part Y and the thin part X can be distributed with high accuracy. When the margin length Lxa of the thin portion X exceeds the allowable upper limit value Lmax, half of the allowable upper limit value Lmax is set as the margin length of the thick portion Y, and the remaining half of the allowable upper limit value Lmax is set as the thin portion X. Since the surplus length is set (step ST12) and the surplus area is surely distributed to both the thick part Y and the thin part X, problems such as insufficient length can be reliably prevented.
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Abstract
Description
これに対して、1枚のスラブに板厚の異なる複数の製品鋼板を割り当てて圧延する異厚圧延が行われており、組み合わせの自由度を増すことで圧延の低歩留の回避が図られている。
これに対して、異厚圧延においては、厚肉部と薄肉部のそれぞれで製品鋼板が採取できる長さを確保する、すなわち、厚肉部と薄肉部のそれぞれに適切な余裕長を配分する必要がある。
特許文献1の異厚鋼板の圧延方法は、被圧延鋼板を厚さの厚い製品鋼板に合わせて一次圧延して厚肉部を形成した後、厚さの薄い製品鋼板に合わせて二次圧延して薄肉部を形成することにより異厚圧延を圧延する方法である。特許文献1では、一次圧延後に鋼板の実側断面積を求め、この実側断面積と、予め設定した製品鋼板を得るに必要な側面の予定側断面積とを比較し、予定側断面積より実側断面積が小さい場合には、重量や納期の面で優先順が高い製品鋼板が含まれる厚肉部、或いは薄肉部の圧延長さを確保する圧延制御が行われる。予定側断面積より実側断面積が大きい場合には、余剰部を厚肉部、薄肉部に均等に配分することを前提とし、製品鋼板の優先順位などを考慮して配分比率を変化させるようにしている。
特許文献1では、予定側断面積を計算する場合に、異厚鋼板の製品寸法(厚肉部の予定長さ及び予定厚さ、薄肉部の予定長さ及び予定厚さ)を使用している。
したがって、特許文献1は、実側断面積(actual lateral area)と予定側断面積(estimated lateral area)との間の余剰側断面積を高精度に算出することができず、厚肉部、薄肉部に最適な余裕長を配分できないので、異厚鋼板の歩留が低下するおそれがある。
本発明は上記事情に鑑みてなされたものであり、異厚鋼板の歩留を向上させることができる異厚鋼板の圧延方法を提供することを目的としている。
[1] 被圧延鋼板を厚さの厚い製品鋼板に合わせて一次圧延して厚肉部を形成した後、厚さの薄い製品鋼板に合わせて二次圧延して薄肉部を形成することにより異厚圧延を圧延する方法において、
一次圧延時に演算した前記厚肉部の実側断面積に基づいて前記薄肉部の余裕長を演算し、
当該薄肉部の余裕長に応じて前記厚肉部及び前記薄肉部に余剰側断面積が配分されるように前記薄肉部の圧延長さを演算し、
演算した前記薄肉部の圧延長さで二次圧延を行う異厚鋼板の圧延方法。
[2] 前記厚肉部の実側断面積は、ゲージメータ板厚で演算した前記厚肉部の実厚と、ワークロールに接続したパルス発生装置から得た信号値による前記厚肉部の実長とで演算されている[1]記載の異厚鋼板の圧延方法。
[3] 前記薄肉部の余裕長が許容上限値を上回っている場合には、前記許容上限値の半分を前記厚肉部の余裕長とし、前記許容上限値の残りの半分を、前記薄肉部の余裕長とする[1]又は[2]記載の異厚鋼板の圧延方法。
[4] 被圧延鋼板を厚さの厚い製品鋼板に合わせて一次圧延して厚肉部を形成した後、厚さの薄い製品鋼板に合わせて二次圧延して薄肉部を形成することにより異厚圧延を行う圧延装置において、
一次圧延時に演算した前記厚肉部の実側断面積に基づいて前記薄肉部の余裕長を演算し、当該薄肉部の余裕長に応じて前記厚肉部及び前記薄肉部に余剰側断面積が配分されるように前記薄肉部の圧延長さを演算する制御コントローラを備え、
制御コントローラで演算した前記薄肉部の圧延長さで二次圧延を行う圧延装置。
[5] 前記厚肉部の実側断面積は、ゲージメータ板厚で演算した前記厚肉部の実厚と、ワークロールに接続したパルス発生装置から得た信号値による前記厚肉部の実長とで演算されている[4]記載の圧延装置。
[6] 前記薄肉部の余裕長が許容上限値を上回っている場合には、前記許容上限値の半分を前記厚肉部の余裕長とし、前記許容上限値の残りの半分を、前記薄肉部の余裕長とする[4]又は[5]記載の圧延装置。
図1は、スラブSを圧延することで異厚鋼板を得る可逆式の圧延機1を示すものである。
図2で示すように、本実施形態の異厚鋼板の圧延方法は、先ず、上下のワークロール2によりスラブSの一次圧延を行うことで、板厚の厚い複数の製品鋼板を得るための長手方向の厚さが均一な厚肉部Yを形成する。次いで、上下のワークロール2により厚肉部Yの長手方向の途中まで二次圧延を行うことで、厚肉部Yと、板厚の薄い複数の製品鋼板を得るための薄肉部Xと、厚肉部Y及び薄肉部Xの間の段差部Zとを有する異厚鋼板11を形成する。
図4の薄肉部の圧延長さ設定処理は、ステップST1において、一次圧延後の厚肉部Yの先端と後端のクロップ長ΔLf,ΔLt,実側断面積Sj及び異厚鋼板11の段差部Zの長さ(段差部長)Dを演算する。段差部Zの段差部長Dについては、予め記憶されている異厚鋼板11の厚肉部Yの製品厚及び薄肉部Xの製品厚に応じたデータから抽出される。
ΔLf=Cf・(1+F)・If-R …(1)
ΔLt=Ct×It-R …(2)
T=M+P/K …(3)
L=Cm ・(1+F)・Im …(4)
制御コントローラ5は、記憶したゲージメータ板厚Tを実厚とし、厚肉部Yの全長Lを実長として、下式(5)に示すように実側断面積Sjを演算して記憶する。
Sj=T×L …式(5)
図4で示す薄肉部の圧延長さ設定処理のステップST2では、薄肉部Xの狙い厚Txを演算する。この薄肉部Xの狙い厚Txは、薄肉部Xの製品鋼板の厚さより僅かに大きな値である。
LXc=(Sj-(Ly+ΔLt+D)×K×T)/(Tx×K) …式(6)
Lya=LXc×C+D …式(7)
次に、ステップST5では、厚肉部Yの製品長Ly、厚肉部Yの後端側クロップ長ΔLt、段差部Zの段差部長D、熱膨張を考慮した係数K、厚肉部Yの余裕長Lyaにより、下式(8)に示すように厚肉部Yの圧延長さLYを演算する。
LY=(Ly+ΔLt+D)×K+Lya …式(8)
LX=(Sj-LY×T)/(Tx×K) …式(9)
ステップST7では、薄肉部Xの圧延長さLX、薄肉部Xの製品長Lx、厚肉部Yの先端側クロップ長ΔLf、段差部Zの段差部長D、薄肉部Xの厚さに対する所定の比率として設定した係数Cにより、下式(10)に示すように薄肉部Xの余裕長Lxaを演算する。
Lxa=LX-(Lx+ΔLf+D)×(1+C) …式(10)
薄肉部Xの余裕長Lxaが許容下限値Lminを下回る場合には、ステップST9に移行して第1の余裕配分処理を行う。また、薄肉部Xの余裕長Lxaが許容下限値Lmin以上の場合には、ステップST10に移行する。
ステップST13に移行し、薄肉部Xの圧延長さLXを、薄肉部の圧延制御値Sxとして出力する。
LY=LY+(Lxa-Lmin)/2×(Tx×K)/T …式(11)
LX=LX-(Lxa-Lmin)/2 …式(12)
このように、第2の余裕配処理では、許容下限値Lminの半分を厚肉部Yの余裕長とし、許容下限値Lminの残りの半分を、薄肉部Xの余裕長とする。
さらに、ステップST12の第3の余裕配分処理では、厚肉部Yの圧延長さLY、許容上限値Lmax、薄肉部Xの狙い厚Tx、熱膨張を考慮した係数K、ゲージメータ板厚Tにより、下式(13)に示すように厚肉部Yの圧延長さLYの再演算を行う。
LY=LY+Lmax/2×(Tx×K)/T …式(13)
LX=LX-Lmax/2 …式(14)
このように、第3の余裕配処理では、許容上限値Lmaxの半分を厚肉部Yの余裕長とし、許容上限値Lmaxの残りの半分を、薄肉部Xの余裕長とする。
制御コントローラ5は、ステップST9の第1の余裕配分処理、ステップST11の第2の余裕配分処理、或いはステップST12の第3の余裕配分処理で演算した薄肉部Xの圧延長さLXに基づいて二次圧延を行うことで、厚肉部Yと、板厚の薄い複数の製品鋼板を得るための薄肉部Xと、厚肉部Y及び薄肉部Xの間の段差部Zとを有する異厚鋼板11を形成する。
本実施形態の薄肉部の圧延長さ設定処理では、薄肉部Xの余裕長Lxaに応じて第1~第3の余裕配分処理を行っている(図4のステップST7~ステップST12)。本実施形態では、薄肉部Xの余裕長Lxaに応じて厚肉部Y及び薄肉部Xに余剰面積を配分しているので、厚肉部Y及び薄肉部Xの長さ不足などの不具合を防止し、歩留りを大幅に減少させて異厚鋼板11を製造することができる。
薄肉部Xの余裕長Lxaが許容上限値Lmaxを上回っている場合には、許容上限値Lmaxの半分を厚肉部Yの余裕長とし、許容上限値Lmaxの残りの半分を、薄肉部Xの余裕長とし(ステップST12)、厚肉部Y及び薄肉部Xの両者に余剰面積を確実に配分するようにしているので、長さ不足などの不具合を確実に防止することができる。
の許容下限値、Lmax…薄肉部の圧延長さの許容上限値
Claims (6)
- 被圧延鋼板を厚さの厚い製品鋼板に合わせて一次圧延して厚肉部を形成した後、厚さの薄い製品鋼板に合わせて二次圧延して薄肉部を形成することにより異厚圧延を圧延する方法において、
一次圧延時に演算した前記厚肉部の実側断面積に基づいて前記薄肉部の余裕長を演算し、
当該薄肉部の余裕長に応じて前記厚肉部及び前記薄肉部に余剰側断面積が配分されるように前記薄肉部の圧延長さを演算し、
演算した前記薄肉部の圧延長さで二次圧延を行う異厚鋼板の圧延方法。 - 前記厚肉部の実側断面積は、ゲージメータ板厚で演算した前記厚肉部の実厚と、ワークロールに接続したパルス発生装置から得た信号値による前記厚肉部の実長とで演算されている請求項1記載の異厚鋼板の圧延方法。
- 前記薄肉部の余裕長が許容上限値を上回っている場合には、前記許容上限値の半分を前記厚肉部の余裕長とし、前記許容上限値の残りの半分を、前記薄肉部の余裕長とする請求項1又は2記載の異厚鋼板の圧延方法。
- 被圧延鋼板を厚さの厚い製品鋼板に合わせて一次圧延して厚肉部を形成した後、厚さの薄い製品鋼板に合わせて二次圧延して薄肉部を形成することにより異厚圧延を行う圧延装置において、
一次圧延時に演算した前記厚肉部の実側断面積に基づいて前記薄肉部の余裕長を演算し、当該薄肉部の余裕長に応じて前記厚肉部及び前記薄肉部に余剰面積が配分されるように前記薄肉部の圧延長さを演算する制御コントローラを備え、
制御コントローラで演算した前記薄肉部の圧延長さで二次圧延を行う圧延装置。 - 前記厚肉部の実側断面積は、ゲージメータ板厚で演算した前記厚肉部の実厚と、ワークロールに接続したパルス発生装置から得た信号値による前記厚肉部の実長とで演算されている請求項4記載の圧延装置。
- 前記薄肉部の余裕長が許容上限値を上回っている場合には、前記許容上限値の半分を前記厚肉部の余裕長とし、前記許容上限値の残りの半分を、前記薄肉部の余裕長とする請求項4又は5記載の圧延装置。
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| JP2004223537A (ja) * | 2003-01-21 | 2004-08-12 | Nippon Steel Corp | テーパープレートの製造方法 |
| JP2006272386A (ja) * | 2005-03-29 | 2006-10-12 | Jfe Steel Kk | 異形鋼板の板厚制御方法 |
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