JP6245196B2 - Rolling method for different width steel plates - Google Patents
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Description
本発明は、長手方向に板幅の異なる幅広部と幅狭部を有する異幅鋼板の圧延方法に関するものである。 The present invention relates to a rolling method for different width steel plates having a wide portion and a narrow portion having different plate widths in the longitudinal direction.
図１は、通常圧延形状と製品配置組合せ例を示す図である。厚板の製造に当たっては、通常図１に示すように、破線で示す長手方向の幅が同じ通常圧延形状にスラブを圧延し、この通常圧延形状の内の必要圧延長で示す矩形から、板幅の異なる複数の製品鋼板（例えば、製品１と３、製品２と４、および製品５と６との組では、それぞれ製品幅が異なる）をそれぞれを採取するのが、一般的である。しかし、小ロットの製品鋼板の場合や、納期に余裕が無く、適正な組合せ相手が見つからない場合には、例えば、図１の斜線部に示すように大きな組合せロスが生じてしまい、歩留が低い状態での圧延となってしまうという問題があった。 FIG. 1 is a diagram illustrating a combination example of a normal rolling shape and a product arrangement. In the production of a thick plate, as shown in FIG. 1, usually, the slab is rolled into a normal rolling shape having the same longitudinal width as indicated by a broken line, and from the rectangle indicated by the required rolling length in the normal rolling shape, the plate width It is common to collect a plurality of product steel plates having different values (for example, the product widths of the sets of products 1 and 3, products 2 and 4, and products 5 and 6 are different). However, in the case of a small-lot product steel plate, or when there is no allowance for delivery and an appropriate combination partner cannot be found, for example, a large combination loss occurs as shown by the hatched portion in FIG. There was a problem of rolling in a low state.
図２は、異幅圧延形状と製品配置組合せ例を示す図である。上記問題に対して、図２に示すように、長手方向に板幅が広い幅広部と板幅が狭い幅狭部を有する異幅鋼板を得ることができる圧延、いわゆる異幅圧延を行うことで、大きな組合せロスを減らし、上述した歩留が低い状態での圧延を回避することができる。 FIG. 2 is a diagram illustrating an example of combinations of different width rolling shapes and product arrangements. For the above problem, as shown in FIG. 2, by performing rolling that can obtain a different width steel sheet having a wide portion with a wide plate width and a narrow portion with a narrow plate width in the longitudinal direction, so-called different width rolling. Thus, it is possible to reduce a large combination loss and to avoid rolling in a state where the above-described yield is low.
従来の異幅圧延を行う方法には、エッジャーを用いる方法（例えば、特許文献１参照）や、分塊圧延機でスラブを圧延する方法（例えば、特許文献２参照）がある。 As a conventional method of performing different width rolling, there are a method using an edger (for example, see Patent Document 1) and a method for rolling a slab with a block mill (for example, see Patent Document 2).
従来、異幅鋼板の圧延にあたっては、必要とするスラブ重量に基づいて、必要圧延長に対する幅広部の長さ（必要幅広長）の割合で定義される異幅率（＝必要幅広長／必要圧延長）を用いて幅広部と幅狭部の長さを決めていた。 Conventionally, when rolling different width steel sheets, the different width ratio (= required wide length / required pressure) defined by the ratio of the length of the wide portion (required wide width) to the required rolling length based on the required slab weight. The length of the wide part and the narrow part was determined by using (extension).
しかしながら、圧延するスラブが当初必要とした重量よりも大きなスラブに対して、上記異幅率をそのまま適用して異幅圧延をした場合には、幅広部、幅狭部ともに必要長よりも長くなってしまう。この場合、製品採取の際にそれぞれ幅広部と幅狭部に分割して、それぞれの必要長以外は余った鋼板として処理することとなる。余った鋼板は大きければ大きいほど、他の製品へ振替えられる可能性が高まるものの、幅広部と幅狭部でそれぞれに細切れに分割された鋼板では、他の製品へ振替えることが十分できず、結局鉄屑として処理され製品歩留が下がってしまうという問題がある。 However, if the slab to be rolled is slab larger than the weight that was initially required, and the different width ratio is applied to the slab as it is, the wide part and the narrow part are both longer than the required length. End up. In this case, the product is divided into a wide part and a narrow part at the time of product collection, and the steel sheet is processed as an extra steel sheet except for the necessary length. The larger the surplus steel plate, the more likely it will be transferred to another product, but the steel plate that is divided into small parts in the wide part and the narrow part cannot be transferred to other products, After all, there is a problem that it is processed as iron scrap and the product yield is lowered.
また、厚板での製品採取は、一般的に、圧延鋼板の長手方向の端部から採取しはじめる。そのため、幅狭部から製品を採取した場合、幅広部に到達する前に、幅広部の製品採取を開始する可能性があり、この場合には幅不足による不合格を発生させてしまうという問題もある。 Moreover, generally the product extraction with a thick plate begins to extract | collect from the edge part of the longitudinal direction of a rolled steel plate. Therefore, when a product is collected from the narrow part, there is a possibility that the product collection of the wide part may be started before reaching the wide part. is there.
本発明は、上記のような事情に鑑みてなされたものであり、当初必要としたスラブ重量よりも重量が大きなスラブであっても、幅不足による不合格を防止するとともに、端部の余りを他の製品へ振替える可能性を高め歩留を上げることができる、異幅鋼板の圧延方法を提供することを目的とするものである。 The present invention has been made in view of the circumstances as described above, and even if the slab has a weight larger than the slab weight that was originally required, the failure due to insufficient width is prevented, and the remainder of the end portion is reduced. It is an object of the present invention to provide a rolling method of different width steel sheets that can increase the possibility of transfer to other products and increase the yield.
上記課題を解決するために、本発明は以下の特徴を有している。 In order to solve the above problems, the present invention has the following features.
［１］ 長手方向に板幅の異なる幅広部と幅狭部を有する異幅鋼板の圧延を異幅率を用いて行う異幅鋼板の圧延方法であって、
圧延する実際のスラブ重量が矩形の鋼板を作るために必要な歩留である基準歩留から要求される必要スラブ重量よりも大きな場合、前記必要スラブ重量に対して必要圧延長における幅広部の長さの割合で定義される異幅率を、以下の（１）式より計算される必要スラブ長に基づき新しく計算し直すことを特徴とする異幅鋼板の圧延方法。
必要スラブ長＝(圧延寸法厚×圧延寸法幅×圧延寸法長)／(基準歩留×スラブ厚×
スラブ幅）・・・・・・（１）
［２］ 上記［１］に記載の異幅鋼板の圧延方法において、
前記異幅率を新しく計算し直すにあたっては、
前記異幅鋼板の先端が幅広部の場合は、以下の（２）式で示す新異幅率(幅広先端)を、必要な幅広部の長さを確保できる新しい異幅率とすることを特徴とする異幅鋼板の圧延方法。
新異幅率(幅広先端) = 異幅率 × 必要スラブ長 /スラブ長・・・・・・（２）
［３］ 上記［１］に記載の異幅鋼板の圧延方法において、
前記異幅率を新しく計算し直すにあたっては、
前記異幅鋼板の先端が幅狭部の場合は、以下の（３）式で示す新異幅率(幅狭先端)を、必要な幅狭部の長さを確保できる新しい異幅率とすることを特徴とする異幅鋼板の圧延方法。
新異幅率(幅狭先端) =１−（（１− 異幅率）× 必要スラブ長 /スラブ長）・・・・・・（３）
[1] A rolling method for different width steel sheets, in which rolling of different width steel sheets having a wide portion and a narrow portion having different widths in the longitudinal direction is performed using different width ratios,
If the actual slab weight to be rolled is larger than the required slab weight required from the standard yield, which is the yield required to make a rectangular steel plate, the length of the wide part in the required rolling length relative to the required slab weight A rolling method for different width steel sheets, characterized in that a different width ratio defined by the ratio of thickness is newly calculated based on a required slab length calculated from the following equation (1).
Required slab length = (rolling dimension thickness x rolling dimension width x rolling dimension length) / (standard yield x slab thickness x
Slab width) ... (1)
[2] In the rolling method for different width steel sheets according to [1] above,
In recalculating the different width ratio,
When the front end of the different width steel plate is a wide part, the new different width ratio (wide front end) shown by the following formula (2) is set to a new different width ratio that can ensure the length of the required wide part. A rolling method of different width steel sheets.
New width ratio (wide tip) = width ratio x required slab length / slab length (2)
[3] In the rolling method for different width steel sheets according to [1] above,
In recalculating the different width ratio,
When the tip of the different width steel plate is a narrow portion, the new different width ratio (narrow tip) expressed by the following formula (3) is set as a new different width ratio that can secure the required length of the narrow portion. The rolling method of the different width steel plate characterized by the above-mentioned.
New width ratio (narrow tip) = 1- ((1- width ratio) x required slab length / slab length) ... (3)
本発明により、異幅圧延を行うにあたって、当初必要としたスラブ重量より大きいスラブであり、先頭が幅広部であるか幅狭部であるかで、それぞれ異幅率を計算し直して新しい異幅率を求めるようにしたので、製品採取を開始する端部から常に必要な長さだけ割り振ることができ幅不足による不合格を防止するとともに、製品採取を終了する端部に大きな余りを割り振ることができ、その余りを別の製品に割り振る可能性を高め歩留を上げることができる。 According to the present invention, when carrying out different width rolling, the slab is larger than the slab weight required at the beginning, and the different width ratio is calculated again depending on whether the head is a wide portion or a narrow portion, and a new different width is obtained. Since the rate is calculated, it is possible to always allocate the required length from the end of starting the product collection, prevent failure due to insufficient width, and allocate a large remainder to the end of product collection. It is possible to increase the possibility of allocating the remainder to another product and increase the yield.
本発明を実施するための形態を、図面および数式に基づいて以下に説明を行う。 EMBODIMENT OF THE INVENTION The form for implementing this invention is demonstrated below based on drawing and numerical formula.
図３は、本発明では、異幅圧延を行うにあたって、当初必要としたスラブ重量より大きいスラブが圧延対象となった場合、先頭が幅広部であるか幅狭部であるかで、それぞれ異幅率を計算し直して新しい異幅率を求めるようにしている。なお、図３に示す演算・処理は、プロセスコンピュータで行う。 FIG. 3 shows that in the present invention, when performing slab rolling with different width, when a slab larger than the initially required slab weight is to be rolled, whether the head is a wide part or a narrow part, The rate is recalculated so that a new different width rate is obtained. 3 is performed by a process computer.
先ず、Step01にて、上位のビジネスコンピュータやオフィスコンピュータから対象とする圧延材の圧延・製品情報の収集を行う。具体的に収集する情報としては、基準歩留、異幅率、幅広部と幅狭部のどちらが先頭かの情報、圧延寸法厚、圧延寸法幅、圧延寸法長、スラブ厚、スラブ幅、およびスラブ長、ならびに実際のスラブ重量などである。 First, in Step 01, rolling and product information of a target rolled material is collected from a host business computer or office computer. Specific information to be collected includes standard yield, different width ratio, information on which wide or narrow portion is the head, rolling dimension thickness, rolling dimension width, rolling dimension length, slab thickness, slab width, and slab Length, as well as actual slab weight.
基準歩留は矩形の鋼板を作るために必要な歩留であり、所定の歩留が予め上位計算機にて設定されている。そして、異幅率は基準歩留から要求される必要スラブ重量に対して必要圧延長における幅広部の長さの割合で定義されている。 The reference yield is a yield required for making a rectangular steel plate, and a predetermined yield is set in advance by a host computer. The different width ratio is defined as the ratio of the length of the wide portion in the required rolling length to the required slab weight required from the reference yield.
圧延寸法幅については、幅広部の幅であり、図２の製品組合せ例では、製品１と製品２の合計幅（製品３と製品４の合計幅は同じ）である。また、圧延寸法長については、幅広部と幅狭部の合計長さであり、図２の製品組合せ例では、必要圧延長として図示している長さである。 The rolling dimension width is the width of the wide portion, and in the example of the product combination in FIG. 2, the total width of the product 1 and the product 2 (the total width of the product 3 and the product 4 is the same). Moreover, about rolling dimension length, it is the total length of a wide part and a narrow part, and is the length illustrated as required rolling length in the product combination example of FIG.
次に、Step02にて、対象としている圧延材が異幅圧延材（異幅材とも称する）かどうかを判定する。異幅材でなければ(Step02でNo）、そのまま処理を終了する。 Next, in Step 02, it is determined whether the target rolled material is a different width rolled material (also referred to as a different width material). If it is not a different width material (No in Step 02), the process is terminated as it is.
異幅材であれば(Step02でYes）、Step03に進み、必要な幅広部長を出すのに必要なスラブの長さである必要スラブ長を、以下の（１）式により計算する。
必要スラブ長＝(圧延寸法厚×圧延寸法幅×圧延寸法長)／(基準歩留×スラブ厚×
スラブ幅）・・・・・・（１）
If it is a different width material (Yes in Step 02), the process proceeds to Step 03, and the required slab length, which is the length of the slab necessary for obtaining the required wide part length, is calculated by the following equation (1).
Required slab length = (rolling dimension thickness x rolling dimension width x rolling dimension length) / (standard yield x slab thickness x
Slab width) ... (1)
そして、Step04で基準歩留（圧延重量／必要スラブ重量）と圧延歩留（圧延重量／実際のスラブ重量）との差が所定の割合を示す閾値を超えているかどうかを判定する。つまり、実際のスラブ重量が基準歩留より求められる必要スラブ重量より所定値以上大きな重量のものであるかどうかを判定するものである。なお、上記圧延重量は、圧延寸法厚×圧延寸法幅×圧延寸法長×比重と演算で求められる。 In Step 04, it is determined whether or not the difference between the reference yield (rolled weight / required slab weight) and the rolling yield (rolled weight / actual slab weight) exceeds a threshold value indicating a predetermined ratio. That is, it is determined whether or not the actual slab weight is greater than the required slab weight obtained from the reference yield by a predetermined value or more. In addition, the said rolling weight is calculated | required by calculation with rolling dimension thickness x rolling dimension width x rolling dimension length x specific gravity.
判定にあたっては、与えられた基準歩留と、実際のスラブ重量から計算する圧延歩留とを比較判定する。また、判定の基準となる閾値については、振替え可能な他の製品などを勘案して予め決めておくものとする。Step04でNoの場合は、当初の異幅率を変更することなく、そのまま処理を終了する。 In the determination, the determined reference yield is compared with the rolling yield calculated from the actual slab weight. In addition, the threshold value used as a criterion for determination is determined in advance in consideration of other products that can be transferred. If No in Step 04, the process is terminated without changing the original different width ratio.
そして、Step04でYesの場合は、Step05に進み、ここで、先端が幅広部かどうかを判定する。異幅鋼板の先端が幅広部(Step05でYes）の場合は、Step06に進む。ここでは、Step03で計算した必要スラブ長に基づいて、以下の（２）式で示す新異幅率(幅広先端)を、必要な幅広部の長さを確保できる新しい異幅率とする。
新異幅率(幅広先端) = 異幅率 × 必要スラブ長 /スラブ長・・・・・・（２）
If Yes in Step 04, the process proceeds to Step 05, where it is determined whether the tip is a wide part. If the tip of the different width steel plate is a wide portion (Yes in Step 05), the process proceeds to Step 06. Here, based on the required slab length calculated in Step 03, the new different width ratio (wide tip) shown in the following equation (2) is set as a new different width ratio that can ensure the length of the required wide portion.
New width ratio (wide tip) = width ratio x required slab length / slab length (2)
さらに、上記新異幅率(幅広先端)を用いて幅広部が先端の場合の必要幅広長を、以下の（３）式で計算する。
必要幅広長 = 新異幅率(幅広先端)× 必要圧延長・・・・・・（３）
Furthermore, using the new different width ratio (wide tip), the required wide length when the wide portion is the tip is calculated by the following equation (3).
Required wide length = New width ratio (wide tip) x Required rolling length (3)
一方、異幅鋼板の先端が幅狭部(Step05でNo）の場合は、Step07に進んで以下の（４）式で示す新異幅率(幅狭先端)を、必要な幅狭部の長さを確保できる新しい異幅率とする。
新異幅率(幅狭先端) =１−（（１− 異幅率）× 必要スラブ長 /スラブ長）・・・・・・（４）
On the other hand, if the tip of the different width steel plate is a narrow portion (No in Step 05), proceed to Step 07 and set the new different width ratio (narrow tip) shown in the following formula (4) to the required length of the narrow portion. A new different width ratio that can secure the thickness.
New width ratio (narrow tip) = 1-((1- width difference ratio) x required slab length / slab length) ... (4)
そして、上記新異幅率(幅狭先端)を用いて幅狭部が先端の場合の必要幅狭長を、以下の（５）式で計算する。
必要幅狭長 = 新異幅率(幅狭先端)× 必要圧延長・・・・・・（５）
Then, using the above-mentioned new different width ratio (narrow tip), the required narrow length when the narrow portion is the tip is calculated by the following equation (5).
Necessary narrow length = New width ratio (narrow tip) x Necessary rolling length (5)
以上のように、先端が幅広部か幅狭部かによって、それぞれ新しい異幅率を計算し直し必要幅広長または必要幅狭長を計算して、幅広部または幅狭部を圧延することで、必要長さを割り振ることができ、かつ、端部に大きな余りを割り振ることができる。 As described above, it is necessary to recalculate the new different width ratio depending on whether the tip is a wide part or a narrow part, calculate the necessary wide width or the necessary narrow width, and roll the wide part or narrow part. The length can be allocated and a large remainder can be allocated at the end.
本発明は、異幅圧延を行うにあたって、当初必要としたスラブ重量より大きいスラブであっても、以上のように先端が幅広部か幅狭部かによってそれぞれ新しい異幅率を計算し直すようにしたので、製品採取を開始する端部には常に必要な長さだけ割り振ることができ幅不足による不合格を防止するとともに、製品採取を終了する端部に大きな余りを割り振ることができ、その余りを別の製品に割り振る可能性を高め歩留を上げることができる。 In the present invention, when performing different width rolling, even if the slab is larger than the initially required slab weight, the new different width ratio is calculated again depending on whether the tip is wide or narrow as described above. Therefore, it is possible to always allocate the required length to the end of starting product collection, prevent failure due to insufficient width, and allocate a large remainder to the end of product collection. Can increase the possibility of allocating the product to another product.
Claims (3)
圧延する実際のスラブ重量が、矩形の鋼板を作るために必要な歩留である基準歩留から要求される必要スラブ重量よりも所定値以上大きな重量の場合には、前記必要スラブ重量に対して必要圧延長における幅広部の長さの割合で定義される異幅率を、以下の（１）式より計算される、必要な幅広部長を出すのに必要なスラブの長さである必要スラブ長に基づき新しく計算し直し、
一方、前記実際のスラブ重量が、前記必要スラブ重量より所定値以上大きな重量でない場合には、当初の異幅率を変更しないことを特徴とする異幅鋼板の圧延方法。
必要スラブ長＝(圧延寸法厚×圧延寸法幅×圧延寸法長)／(基準歩留×スラブ厚×スラブ幅）・・・・・・（１） The rolling of the different width steel sheet having a different wide portion and the narrow portion of the longitudinal direction in the plate width, a rolling method of a different width steel sheet performed with different width ratio,
Actual slab weight to rolling, in the case of large weight value or more, than the required slab weight required from the reference yield which is a yield needed to make a rectangular steel plate, to the need slab weight The required slab length, which is the length of the slab required to obtain the required wide part length, calculated from the following formula (1), the different width ratio defined by the ratio of the length of the wide part in the required rolling length again newly calculated on the basis of,
On the other hand, when the actual slab weight is not a weight larger than the required slab weight by a predetermined value or more, the original different width ratio is not changed .
Necessary slab length = (rolling dimension thickness x rolling dimension width x rolling dimension length) / (standard yield x slab thickness x slab width) (1)
前記異幅率を新しく計算し直すにあたっては、
前記異幅鋼板の先端が幅広部の場合は、以下の（２）式で示す新異幅率(幅広先端)を、必要な幅広部の長さを確保できる新しい異幅率とすることを特徴とする異幅鋼板の圧延方法。
新異幅率(幅広先端)＝異幅率×必要スラブ長／スラブ長・・・・・・（２） In the rolling method of the different width steel plate according to claim 1,
In recalculating the different width ratio,
When the front end of the different width steel plate is a wide part, the new different width ratio (wide front end) shown by the following formula (2) is set to a new different width ratio that can ensure the length of the required wide part. A rolling method of different width steel sheets.
New width ratio (wide tip) = width ratio x required slab length / slab length (2)
前記異幅率を新しく計算し直すにあたっては、
前記異幅鋼板の先端が幅狭部の場合は、以下の（４）式で示す新異幅率(幅狭先端)を、必要な幅狭部の長さを確保できる新しい異幅率とすることを特徴とする異幅鋼板の圧延方法。
新異幅率(幅狭先端)＝１−（（１−異幅率）×必要スラブ長／スラブ長）・・・・・・（４） In the rolling method of the different width steel plate according to claim 1,
In recalculating the different width ratio,
When the tip of the different width steel plate is a narrow portion, the new different width ratio (narrow tip) expressed by the following formula (4) is set as a new different width ratio that can secure the necessary length of the narrow portion. The rolling method of the different width steel plate characterized by the above-mentioned.
New width ratio (narrow tip) = 1-((1-width ratio) x required slab length / slab length) (4)
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