JP3180937B2 - Manufacturing method of tapered plate - Google Patents
Manufacturing method of tapered plateInfo
- Publication number
- JP3180937B2 JP3180937B2 JP32947293A JP32947293A JP3180937B2 JP 3180937 B2 JP3180937 B2 JP 3180937B2 JP 32947293 A JP32947293 A JP 32947293A JP 32947293 A JP32947293 A JP 32947293A JP 3180937 B2 JP3180937 B2 JP 3180937B2
- Authority
- JP
- Japan
- Prior art keywords
- thickness
- plate
- product
- rolling
- taper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/24—Automatic variation of thickness according to a predetermined program
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、テーパプレートの製造
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a tapered plate.
【０００２】[0002]
【従来の技術】長手方向にその一端から他端に向かって
漸次厚みの異なるテーパもしくは勾配をもつ鋼板（以
下、テーパプレートという）は、あらかじめ長手方向に
受ける負荷分布に応じた断面寸法に製造可能であるた
め、一般構造用部材に使用する場合など極めて合理的で
素材重量の軽減、素材の節約などに大いに効果がある。2. Description of the Related Art A steel plate having a taper or gradient having a gradually increasing thickness from one end to the other end in the longitudinal direction (hereinafter referred to as a tapered plate) can be manufactured to have a sectional size corresponding to a load distribution received in the longitudinal direction in advance. Therefore, it is extremely rational when used for a general structural member, and has a great effect on reduction of material weight and saving of material.
【０００３】このテーパプレートの製造方法としては、
従来、たとえば特公昭51− 35183号公報に開示された方
法などにより、板厚制御精度の改善を図ろうと試みられ
ている。すなわち、特公昭51− 35183号の内容は、測定
したロール間隙、圧延荷重および圧延速度から実板厚を
演算し、その実板厚と目標板厚設定器に設定した目標板
厚と比較し、その偏差により鋼板圧延機のロール間隙を
制御するようにし、テーパ傾度設定器に設定した所定の
テーパ傾度を前記圧延速度に乗じた制御値によって前記
目標板厚設定器における目標板厚を連続的に変化させる
ようにしたものである。[0003] As a method of manufacturing this taper plate,
Heretofore, attempts have been made to improve the thickness control accuracy, for example, by the method disclosed in Japanese Patent Publication No. 51-35183. That is, the contents of JP-B-51-35183 are based on the calculation of the actual sheet thickness from the measured roll gap, rolling load and rolling speed, and comparing the actual sheet thickness with the target sheet thickness set in the target sheet thickness setting device. The roll gap of the steel sheet rolling mill is controlled by the deviation, and the target thickness in the target thickness setting device is continuously changed by a control value obtained by multiplying the rolling speed by a predetermined taper inclination set in the taper inclination setting device. It is intended to be.
【０００４】そして、上記の技術でｎ回の圧延によって
製造されたテーパプレートは、図４に示すように、頭部
のＰ1 点までは板厚ａn で長さＡn の平坦部（先端余長
部）、尾部のＰ2 点までは板厚ｂn で長さＢn の平坦部
（後端余長部）を有し、その中間にテーパ傾度αn で長
さＬn なるテーパ鋼板部を有するとしている。[0004] Then, a tapered plate manufactured by rolling n times with the described technique, as shown in FIG. 4, the flat portion of the length A n in thickness a n until P 1 point of the head (tip A tapered steel plate having a flat portion (remaining extra length portion) of plate thickness b n and length B n up to point P 2 of the tail portion, and a length L n with a taper gradient α n in the middle thereof. It has a part.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
たような従来技術を用いてもテーパプレートの板厚制御
精度は通常鋼板の精度に及ばずに、一般的には（鋼板長
手方向平均実績厚−鋼板長手方向平均狙い厚）の板間ば
らつき（標準偏差σ）で通常鋼板の２倍以上もの精度悪
化が確認されている。However, even when the above-described conventional technology is used, the accuracy of controlling the thickness of the tapered plate does not usually reach the accuracy of the steel plate. It has been confirmed that the accuracy (standard deviation σ) of the inter-plate variation in the average target thickness in the longitudinal direction of the steel plate is more than twice that of the normal steel plate.
【０００６】このような板厚精度の悪化は、製品寸法の
不合格率の上昇を招くことはもとより、これを軽減すべ
く、鋼板の圧延狙い厚さと板厚公差下限値との差（板厚
余裕代）を通常鋼板以上に確保しようとするため、平均
的に製品厚が厚くなるなどの弊害をもたらすのである。
特に、後者の板厚余裕代の増大は、テーパプレートを使
用する際の重要なメリットの一つである構造物の軽量化
（たとえば造船に使用される場合は船体が軽量化される
こと）を阻害するものであり、テーパプレート製造の意
義自体にかかわる大きな問題点となっている。[0006] Such deterioration in sheet thickness accuracy not only leads to an increase in the rejection rate of product dimensions, but also to reduce the difference between the target rolling thickness of the steel sheet and the lower limit of the sheet thickness tolerance (sheet thickness). In order to ensure a margin of more than a normal steel sheet, there is an adverse effect such as an increase in the product thickness on average.
In particular, the latter increase in the sheet thickness allowance is one of the important advantages when using the tapered plate, which is to reduce the weight of the structure (for example, the hull is reduced when used in shipbuilding). This is a hindrance, and is a major problem related to the significance of the manufacture of the tapered plate.
【０００７】本発明は、上記したような従来のテーパプ
レートの製造における板厚制御精度の不良に起因した寸
法不合格率の増加や製品厚の増大にともなう製品重量の
増大などの課題を解決すべくなされたものであって、製
品採取時の切断位置を調整し得るようにするために、圧
延時の板厚プロフィールを適切にしたテーパプレートの
製造方法を提供することを目的とする。[0007] The present invention solves the problems such as an increase in the dimensional rejection rate due to poor thickness control accuracy in the conventional taper plate manufacturing as described above, and an increase in product weight due to an increase in product thickness. It is an object of the present invention to provide a method of manufacturing a tapered plate having an appropriate thickness profile at the time of rolling in order to adjust a cutting position at the time of collecting a product.
【０００８】[0008]
【課題を解決するための手段】本発明は、長手方向にそ
の一端から他端に向かって漸次厚みの異なるテーパプレ
ートを圧延するに際し、被圧延材を、製品長に所定の余
長を加えた全長にわたって所定のテーパ勾配を有する形
状で圧延する工程と、 その後被圧延材長手方向の板厚プ
ロフィールを測定する工程と、この測定結果に基づいて
被圧延材から所定寸法のテーパプレートの採取位置をプ
レート長手方向で調整する工程と、からなることを特徴
とするテーパプレートの製造方法である。According to the present invention, when a tapered plate having a gradually different thickness is rolled from one end to the other end in a longitudinal direction, a material to be rolled is added to a product length by a predetermined margin.
Rolling in a shape having a predetermined taper gradient over the entire length including the length, and then measuring a thickness profile in the longitudinal direction of the material to be rolled, and a taper plate having a predetermined dimension from the material to be rolled based on the measurement result. up the sampling position of
And a step of adjusting the rate in the longitudinal direction .
【０００９】[0009]
【作 用】本発明によれば、被圧延材の全長（製品長＋
余長）にわたって所定のテーパ勾配を有する形状で圧延
して切断時の製品採取位置を変更（プレート長手方向で
調整）するようにしたので、 実績板厚の狙い板厚との差
異を補償することができ、これによって寸法精度がよく
かつ軽重量のテーパプレートを製造することが可能であ
る。[Operation] According to the present invention, the total length of the material to be rolled (product length +
Rolling over a shape with a predetermined taper gradient over the extra length to change the product sampling position during cutting (in the plate longitudinal direction)
Adjustment) makes it possible to compensate for the difference between the actual plate thickness and the target plate thickness, thereby making it possible to manufacture a tapered plate with good dimensional accuracy and light weight.
【００１０】すなわち、図１に示すように、本発明の被
圧延材は最終の圧延によって、薄部の先端部から長さＡ
のＰ1 点での狙い厚をａに、このＰ1 点から厚部の方向
に所定の長さＬなるＰ2 点での狙い厚をｂになるよう
に、しかも長手方向全長にわたってそのテーパ傾度がα
になるように圧延する。このときのＰ2 点の後端部から
の長さはＢである。That is, as shown in FIG. 1, the material to be rolled according to the present invention has a length A from the tip of the thin portion by the final rolling.
Aim thick a in the P 1 point, the taper gradient aim thickness of a predetermined length L becomes P 2 points in the direction of the thick portion from the P 1 point so that the b, moreover over the entire longitudinal length Is α
Roll so that it becomes. At this time, the length from the rear end of the point P 2 is B.
【００１１】そして、切断工程において、まず被圧延材
長手方向の板厚プロフィールを測定し、切断位置を長手
方向に寸法不良の発生しない範囲で調整して、先端部お
よび後端部での板厚がそれぞれの狙い厚ａ，ｂの値が得
られる位置を切断位置に設定することにより、狙い厚に
対する実績厚の差異のないテーパプレートを採取するこ
とが可能となる。[0011] In the cutting step, first, the thickness profile in the longitudinal direction of the material to be rolled is measured, and the cutting position is adjusted within a range where dimensional defects do not occur in the longitudinal direction. By setting the position at which the value of each of the target thicknesses a and b is obtained as the cutting position, it becomes possible to collect a taper plate having no difference in the actual thickness from the target thickness.
【００１２】具体的に、図２を用いて製品採取の要領を
説明する。図２(a) は、各点Ｐ1 ，Ｐ2 での狙い厚（点
線）に対し実績厚（実線）が全体的に薄くなった場合を
示したものであるが、図示のように切断点を狙い厚が満
足されるようにＰ1 →Ｐ1 ′に、またＰ2 →Ｐ2 ′に設
定し直すのである。これにより、従来法では厚さ不足で
寸法不合格となるべき製品が救済されることになる。Specifically, the procedure of product collection will be described with reference to FIG. FIG. 2A shows a case where the actual thickness (solid line) is thinner as a whole with respect to the target thickness (dotted line) at each point P 1 and P 2. Is set again to P 1 → P 1 ′ and P 2 → P 2 ′ so that the thickness is satisfied. As a result, a product which should be rejected due to insufficient thickness in the conventional method is rescued.
【００１３】図２(b) は各点Ｐ1 ，Ｐ2 での狙い厚（点
線）に対し実績厚（実線）が全体的に厚くなった場合を
示したものであるが、図示のように切断点を狙い厚が満
足されるようにＰ1 →Ｐ1 ″に、またＰ2 →Ｐ2 ″に設
定し直すことにより、従来法では製品平均厚が厚いため
製品重量が超過傾向になるべき製品が救済されることに
なる。FIG. 2 (b) shows a case where the actual thickness (solid line) is generally thicker than the target thickness (dotted line) at each of the points P 1 and P 2. By setting P 1 → P 1 ″ and P 2 → P 2 ″ again so as to satisfy the thickness at the cutting point, the product weight should tend to exceed the conventional method because the average product thickness is large. The product will be rescued.
【００１４】上記のように、本発明法は、テーパプレー
トの寸法不合格の防止に加え、鋼板の重量低減により、
より一層構造物の重量低減を図るのに極めて有効な手段
である。As described above, the method of the present invention not only prevents the rejection of dimensions of the tapered plate but also reduces the weight of the steel sheet.
This is a very effective means for further reducing the weight of the structure.
【００１５】[0015]
【実施例】以下に、本発明の実施例について説明する。
図３(a) に示すように、薄部である先端部Ｐ1 での狙い
厚ａが15mm、厚部である後端部Ｐ2 での狙い厚ｂが25mm
で製品長Ｌが15000 mm、製品幅が3000mm、厚さ公差が各
部所定厚に対して−0.40mm, ＋0.80mmのテーパプレート
を圧延する際に、本発明を適用した。なお、比較のため
に、図３(b) に示す従来法での狙い厚プロフィールで圧
延を行った。それらの結果を表１にそれぞれ示した。な
お、本発明法では両端部での余長を通常鋼板並の375 mm
ずつ計750 mm（５％に相当）としているが、この値につ
いては、厚さ制御精度の良否により増減すべきものであ
る。Embodiments of the present invention will be described below.
As shown in FIG. 3 (a), aimed thickness a is 15mm at the tip portion P 1 is a thin section, aimed thickness b is 25mm at the rear end portion P 2 is the thickness portion
The present invention was applied when rolling a taper plate having a product length L of 15,000 mm, a product width of 3000 mm, and a thickness tolerance of −0.40 mm and +0.80 mm with respect to a predetermined thickness of each part. For comparison, rolling was performed with the target thickness profile according to the conventional method shown in FIG. 3 (b). The results are shown in Table 1. In the method of the present invention, the excess length at both ends is 375 mm, which is equivalent to that of a normal steel plate
Each is 750 mm (equivalent to 5%), but this value should be increased or decreased depending on the accuracy of the thickness control.
【００１６】[0016]
【表１】 [Table 1]
【００１７】この表から明らかなように、従来法に比べ
て、本発明法は厚さ不合格率、製品実績平均厚、製品実
績平均厚標準偏差（σ）、製品実績平均重量、重量精度
のいずれにおいてもすぐれており、寸法不合格率の低減
および重量の軽減、重量精度の改善に極めて有効である
ことがわかる。As is clear from this table, compared with the conventional method, the method of the present invention has the following advantages: thickness rejection rate, product actual average thickness, product actual average thickness standard deviation (σ), product actual average weight, and weight accuracy. In any case, it is excellent, and it is understood that it is extremely effective in reducing the dimensional rejection rate, reducing the weight, and improving the weight accuracy.
【００１８】[0018]
【発明の効果】以上説明したように、本発明によれば、
被圧延材の全長にわたって所定のテーパ勾配を有する形
状で圧延して切断時の製品採取位置を変更するようにし
たので、実績板厚の狙い板厚との差異を補償することが
でき、これによって寸法精度がよくかつ軽重量のテーパ
プレートを製造することが可能となり、さらに製品の合
格率の向上に寄与する。As described above, according to the present invention,
Since the rolling position is changed in a shape having a predetermined taper gradient over the entire length of the material to be rolled and the product sampling position at the time of cutting is changed, it is possible to compensate for the difference between the actual thickness and the target thickness. It becomes possible to manufacture a tapered plate with good dimensional accuracy and light weight, and further contributes to an improvement in the acceptance rate of products.
【図１】本発明法に係る狙い厚プロフィールを示す側面
図である。FIG. 1 is a side view showing a target thickness profile according to the method of the present invention.
【図２】本発明法での製品採取の要領を説明する図であ
る。FIG. 2 is a diagram for explaining a procedure of collecting a product according to the method of the present invention.
【図３】(a) は本発明法の適用例、(b) は従来法の適用
例を示す側面図である。3A is a side view showing an application example of the method of the present invention, and FIG. 3B is a side view showing an application example of the conventional method.
【図４】従来法での狙い厚プロフィールを示す側面図で
ある。FIG. 4 is a side view showing a target thickness profile in a conventional method.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川嶋 俊明 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社 水島製鉄所内 (72)発明者 西田 俊一 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社 水島製鉄所内 (56)参考文献 特公 昭49−37333（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) B21B 1/38 B21B 37/00 B21C 51/00 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiaki Kawashima 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref. Chome (without address) Inside Kawasaki Steel Corporation Mizushima Works (56) References JP 49-37333 (JP, B1) (58) Fields investigated (Int. Cl. 7 , DB name) B21B 1/38 B21B 37/00 B21C 51/00
Claims (1)
漸次厚みの異なるテーパプレートを圧延するに際し、被
圧延材を、製品長に所定の余長を加えた全長にわたって
所定のテーパ勾配を有する形状で圧延する工程と、 その
後被圧延材長手方向の板厚プロフィールを測定する工程
と、この測定結果に基づいて被圧延材から所定寸法のテ
ーパプレートの採取位置をプレート長手方向で調整する
工程と、からなることを特徴とするテーパプレートの製
造方法。In rolling a taper plate having a gradually different thickness from one end to the other end in a longitudinal direction, a material to be rolled has a predetermined taper gradient over the entire length obtained by adding a predetermined extra length to a product length. Rolling the shape, and then measuring the thickness profile in the longitudinal direction of the material to be rolled , and adjusting the sampling position of a taper plate of a predetermined size from the material to be rolled in the plate longitudinal direction based on the measurement result. And a method of manufacturing a tapered plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32947293A JP3180937B2 (en) | 1993-12-27 | 1993-12-27 | Manufacturing method of tapered plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32947293A JP3180937B2 (en) | 1993-12-27 | 1993-12-27 | Manufacturing method of tapered plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07185604A JPH07185604A (en) | 1995-07-25 |
| JP3180937B2 true JP3180937B2 (en) | 2001-07-03 |
Family
ID=18221764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32947293A Expired - Fee Related JP3180937B2 (en) | 1993-12-27 | 1993-12-27 | Manufacturing method of tapered plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3180937B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1033685C2 (en) * | 2007-04-13 | 2008-10-14 | Weweler Nv | Support arm varying in width. |
| JP5420445B2 (en) * | 2010-02-23 | 2014-02-19 | 新日鐵住金株式会社 | Method of searching for gradient change point of tapered steel plate and method of manufacturing tapered steel plate |
| JP5962923B2 (en) * | 2013-08-21 | 2016-08-03 | Ｊｆｅスチール株式会社 | Thick plate manufacturing method |
-
1993
- 1993-12-27 JP JP32947293A patent/JP3180937B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07185604A (en) | 1995-07-25 |
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