JPH02211908A - Guide device for shape steel and universal rolling mill equipped with this device - Google Patents
Guide device for shape steel and universal rolling mill equipped with this deviceInfo
- Publication number
- JPH02211908A JPH02211908A JP1029995A JP2999589A JPH02211908A JP H02211908 A JPH02211908 A JP H02211908A JP 1029995 A JP1029995 A JP 1029995A JP 2999589 A JP2999589 A JP 2999589A JP H02211908 A JPH02211908 A JP H02211908A
- Authority
- JP
- Japan
- Prior art keywords
- rolling mill
- web
- roll
- flange
- rolls
- 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.)
- Granted
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 53
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 19
- 239000010959 steel Substances 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 230000003028 elevating effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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
- B21B1/088—H- or I-sections
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、Ｈ形、！形あるいは溝形の如き形鋼を熱間
圧延する場合にユニバーサル圧延機において発生し易い
形材のウェブ中心の偏りを効果的に防止できる誘導装置
およびその装置を備えた圧延機に関するものである。[Detailed Description of the Invention] (Industrial Application Field) This invention provides H-shape,! The present invention relates to a guiding device that can effectively prevent the deviation of the web center of a section, which tends to occur in a universal rolling mill, when hot rolling steel sections such as shapes or grooves, and a rolling mill equipped with the device.
以下Ｈ形鋼を圧延する場合を例として説明する。The following will explain the case of rolling an H-section steel as an example.
（従来の技術）
Ｈ形鋼を圧延にて製造する場合には、形材のウェブ厚さ
の中心位置をフランジ幅の中心位置になるべく一致させ
るように圧延すること、すなわちウェブ中心の偏りの発
生をできる限り抑制することが製品品質上からも極めて
重要であって、これに関する先行文献として特公昭５３
−３４５８７号公報が参照される。(Prior art) When manufacturing H-section steel by rolling, it is necessary to roll so that the center position of the web thickness of the section coincides with the center position of the flange width as much as possible, that is, the occurrence of deviation of the web center. It is extremely important to suppress this as much as possible from the viewpoint of product quality, and a prior document on this topic is
-34587 publication is referred to.
（発明が解決しようとする課題）
ところで上記の公報に開示の技術は、形材の誘導を司る
設備の大型化が避けられないばかりでなく、ユニバーサ
ル圧延機の圧延ロールの中心から誘導装置に至るまでの
間隔が比較的大きいため、その間における変形が避けら
れず、しかも支持フレームの適切な調整を施したとして
もウェブ中心の偏りの是正量は、支持フレームの移動量
の５〜１０％程度であり、形鋼の寸法精度を大幅に向上
させることは非常に困難であった。(Problems to be Solved by the Invention) However, the technology disclosed in the above-mentioned publication not only inevitably increases the size of the equipment that controls the guidance of the shaped material, but also causes problems that extend from the center of the rolling roll of the universal rolling mill to the guidance device. Because the distance between the two ends is relatively large, deformation in between is unavoidable, and even if the support frame is properly adjusted, the amount of correction of the deviation in the center of the web is only about 5 to 10% of the amount of movement of the support frame. Therefore, it has been extremely difficult to significantly improve the dimensional accuracy of section steel.
形鋼を圧延する際に不可避なウェブ中心の偏り等の従来
の問題をコンパクトな仕組みをもって効果的に軽減ない
しは防止できる新規な誘導装置とその装置を備えた圧延
機を提案することがこの発明の目的である。It is an object of the present invention to propose a novel guidance device and a rolling mill equipped with the device, which can effectively reduce or prevent conventional problems such as the unavoidable web center deviation when rolling section steel with a compact mechanism. It is a purpose.
（課題を解決するための手段）
この発明は、ユニバーサル圧延機の入側から出側に至る
までの間又は該圧延機の入側から圧延ロールのロール中
心に至るまでの間に配設され、フランジおよびウェブを
有する形材のフランジの幅端面をそれぞれ上下に挟む左
右一対のガイドとこれら左右各々のガイドの上下におけ
る少なくとも一方を上下方向に移動させる昇降手段を有
する形鋼の誘導装置で圧延材の上・下方向位置を規制す
るものであり、ここに上記のガイドには、形材のフラン
ジ幅端面におけるすりきず防止のため該形材のフランジ
幅端に当接して転動するガイドローラを設けるのがよい
。(Means for Solving the Problems) The present invention provides a universal rolling mill that is disposed between the entry side and the exit side of the rolling mill or between the entry side of the rolling mill and the roll center of the rolling roll, A rolled material is used in a shape steel guiding device that has a pair of left and right guides that vertically sandwich the width end faces of a flange of a shape material having a flange and a web, and a lifting means that moves at least one of the top and bottom of these left and right guides in the vertical direction. The above guide is equipped with a guide roller that rolls in contact with the flange width edge of the profile to prevent scratches on the flange width edge of the profile. It is good to have one.
またこの発明は、フランジおよびウェブを有する形材の
該ウェブを上下から挟むかたちでウェブ厚を圧下するロ
ール幅の変更可能な水平ロールと形材のフランジ外面か
らフランジ厚を圧下する左右一対の竪ロールを備えたユ
ニバーサル圧延機において、上記ユニバーサル圧延機の
入側から出側に至るまでの間又は該圧延機の入側から圧
延ロールのロール中心に至るまでの間に、形材のフラン
ジ幅端面をそれぞれ上下に挟む左右一対のガイドとこれ
ら左右各々のガイドの上下少なくとも一方を上下方向に
移動させる昇降手段よりなる誘導装置を配設したことを
特徴とするユニバーサル圧延機である。The present invention also provides a horizontal roll whose width can be changed to reduce the web thickness by sandwiching the web of a profile having a flange and a web from above and below, and a pair of left and right vertical rolls that reduce the flange thickness from the outer surface of the flange of the profile. In a universal rolling mill equipped with a roll, the flange width end face of the profile is formed between the entrance side of the universal rolling mill and the exit side of the universal rolling mill, or between the entrance side of the rolling mill and the roll center of the rolling roll. This universal rolling mill is characterized in that it is equipped with a guiding device comprising a pair of left and right guides that sandwich the two guides vertically, and a lifting device that moves at least one of the left and right guides in the vertical direction.
さて第１図に、この発明に従う誘導装置を水平ロールＨ
および竪ロール■を有するユニバーサル圧延機に組み込
んだ状態として模式的に示す。図中１，１′および２．
２′は、フランジｈ、およびウェブｈｂを有する形材Ａ
のフランジ幅端をそれぞれ上下に挟む左右一対のガイド
、３は例えばスクリューロッドおよびギヤからなり各ガ
イド対１．１’および２，２′の少なくとも一方（この
例では１および２）を上下に移動させる昇降手段、４は
竪ロール■のロールチョックカバーであり、ガイド１お
よび２はそれぞれロールチョックカバー４を左右に挟む
補強板を兼ねた案内リブ１ａ、２ａを介してカバー４に
固定葆持される昇降手段３のスクリューロッドへ連結さ
れる。Now, FIG. 1 shows a guidance device according to the present invention on a horizontal roll H.
It is schematically shown as being installed in a universal rolling mill having vertical rolls (1) and (2). 1, 1' and 2 in the figure.
2' is a profile A with a flange h and a web hb
A pair of left and right guides, 3, which vertically sandwich the flange width ends of the flange, respectively, are made of, for example, a screw rod and a gear. The elevating means 4 is a roll chock cover of the vertical roll ■, and the guides 1 and 2 are elevating means fixed to the cover 4 via guide ribs 1a and 2a, which also serve as reinforcing plates that sandwich the roll chock cover 4 on the left and right sides, respectively. Connected to the screw rod of means 3.
第２図に上記の構成になる誘導装置のとくにガイド１，
１′および２，２′の配置状況を分かりやすく図解した
。Figure 2 shows the guidance device with the above configuration, especially the guide 1,
The arrangement of 1' and 2,2' is illustrated in an easy-to-understand manner.
また第３図に、この発明に従う誘導装置の他の例を片側
半分のみについて模式的に示し、図中の５はかききず防
止用のガイドローラで、このローラ５は水平ロールとの
干渉防止のため水平ロールＨの入側および出側において
該ロールに可能な限り近接して設置される。FIG. 3 schematically shows only one half of another example of the guiding device according to the present invention, and numeral 5 in the figure is a guide roller for preventing scratches, and this roller 5 is for preventing interference with the horizontal roll. Therefore, it is installed as close as possible to the horizontal roll H on the entry and exit sides of the roll.
（作 用）
従来Ｈ形鋼の圧延では、第４図に示すように堅ロール■
の左右からの圧下により形材Ａのフランジｈ、の幅中心
とパスラインが上下の何れかへΔｈだけ移動することが
あり、これがウェブ中心の偏りの原因となる。とくにロ
ールやガイドの頻繁な取り替えを要することなく同一圧
延チャンス内で多種サイズの形鋼を圧延したり外幅一定
の形鋼を圧延するのに有利な圧延方式（特願昭６３−１
５９８１８号、特願昭６３−１５６８２８号参照）にお
いてはその傾向は一層著しい。(Function) Conventionally, in the rolling of H-beam steel, hard rolls were used as shown in Figure 4.
Due to the rolling down from the left and right sides, the width center of the flange h of the profile A and the pass line may move either up or down by Δh, which causes a deviation in the center of the web. In particular, this rolling method is advantageous for rolling steel sections of various sizes within the same rolling machine without requiring frequent replacement of rolls and guides, and for rolling steel sections with a constant outer width (Japanese Patent Application No. 63-1).
59818 and Japanese Patent Application No. 156828/1983), this tendency is even more remarkable.
この発明では、ユニバーサル圧延機の入側から出側に至
るまでの間またはその圧延材の入側から圧延ロールのロ
ール中心に至るまでの間に上述の如き構成になる誘導装
置を設けることとしたので形材を拘束した状態で少なく
とも圧延ロールのロール中心まで確実に誘導できるので
ウェブ中心の偏りは効果的に軽減される。In this invention, a guiding device having the above-mentioned configuration is provided between the input side and the output side of the universal rolling mill or between the input side of the rolled material and the roll center of the rolling roll. Therefore, the web can be reliably guided to at least the roll center of the rolling roll while the web is restrained, so that the deviation of the web center can be effectively reduced.
ここに形材Ａのフランジ幅をＢとし、ガイドの上下間隔
をｂとしたとき、第５図に示すように形材Ａのフランジ
ｈ、が（ｂ−Ｂ）だけ上下の何れかに移動し、その偏り
量はパスラインとガイドの上下間隔すの中点が一致して
いる場合に最大で（ｂ−Ｂ）／２となる。Here, when the flange width of profile A is B and the vertical distance between the guides is b, the flange h of profile A moves either up or down by (b-B) as shown in Figure 5. , the amount of deviation is at most (b-B)/2 when the midpoint of the vertical distance between the pass line and the guide coincides.
従って各ガイドの上下間隔すは、予め昇降手段３によっ
て圧延すべき形材のフランジ幅已になるべく近い値に調
整しておくことが肝要である。Therefore, it is important that the vertical distance between each guide is adjusted in advance by the elevating means 3 to a value as close as possible to the flange width of the section to be rolled.
第６図は、この発明に従う誘導装置を備えたユニバーサ
ル圧延機の模式を示すもので、この圧延機は、形材Ａの
ウェブｈｂを上下に挟むロール幅Ｗの変更可能な水平ロ
ールＨ′と形材Ａのフランジ外側を拘束する左右一対の
竪ロールＶを有し、水平ロールＨ′のロール幅Ｗおよび
竪ロール■のロール間隔を適宜調整することによって、
ロールやガイドの頻繁な取り替えを要することなく外幅
一定の形鋼を製造したり、多種サイズの形鋼を同一圧延
チャンス内で製造するのに有利であり、特にウェブｈ、
を高さ方向に圧下縮小する際に懸念されるウェブ中心の
大きな偏りの発生は回避され、寸法精度をより一層向上
させることができる。FIG. 6 shows a schematic diagram of a universal rolling mill equipped with a guiding device according to the present invention. It has a pair of left and right vertical rolls V that restrain the outside of the flange of the profile A, and by appropriately adjusting the roll width W of the horizontal roll H' and the roll interval of the vertical roll ■,
It is advantageous for producing steel sections with a constant outer width without requiring frequent replacement of rolls and guides, and for producing sections of various sizes within the same rolling machine.
The occurrence of a large deviation in the center of the web, which is a concern when reducing the web in the height direction, is avoided, and dimensional accuracy can be further improved.
なお、この発明に従う誘導装置によれば第７図に示すよ
うに、形材Ａのパスラインとガイドの上下間隔すの中点
を意識的にΔｈだけずらすことによって、フランジの脚
長の異なった特殊な用途の形鋼を製造することもできる
。In addition, according to the guiding device according to the present invention, as shown in FIG. It is also possible to produce shaped steel for various uses.
（実施例）
粗ユニバーサル圧延を経た第８図（ａ）に示す如き断面
形状になる形材（Ｗ’＋ ＝３７６ａ＋ｍ、 ｈ＋ ＝
２００ｍｍ。(Example) A profile having a cross-sectional shape as shown in FIG. 8(a) after rough universal rolling (W'+ = 376a+m, h+ =
200mm.
Ｒ，＝１９．抛ｍ、 ｔ ＋ ＝８．２ｍｍ、 ｒｌ
＝１４．８＋ｍ＋ θ＝５°）を上掲第６図に示した
圧延機を用いて、圧延機におけるＷｚ ＝３５８＋ａｍ
、ｈｔ ＝２０２ｍｍ 、Ｒｚ＝１６．０ｍｍ。R,=19.抛m, t + =8.2mm, rl
= 14.8 + m + θ = 5°) using the rolling mill shown in Figure 6 above, Wz = 358 + am in the rolling mill.
, ht = 202mm, Rz = 16.0mm.
ｔ ２ ＝８．０ｍｍ、、ｈ＝１４．０ｍｍ、θ＝０°
（第８図（ｂ）参照）として圧延を行った。なお、こ
の実施例ではウェブ中心の偏り易いウェブ高さ方向に圧
縮する圧延を実施し、なおかつガイド詰まりを発生させ
ないようにガイドと圧延材の余裕代を考慮した。t 2 =8.0mm, h=14.0mm, θ=0°
(See FIG. 8(b)). In this example, rolling was carried out to compress the web in the height direction, where the center of the web tends to be biased, and allowances for the guide and the rolled material were taken into consideration so as not to cause guide clogging.
その結果、ガイドを使用しなかった同一条件での圧延で
は、ウェブ中心の偏りが平均６．４１１ＩＩＩ＋である
のに対し、この発明では±２．０ｍｍ程度であり、しか
もそれが形鋼の全長にわたりほぼ同じ傾向・寸法で安定
していることが確かめられた。As a result, in rolling under the same conditions without using a guide, the deviation in the web center was 6.411III+ on average, whereas in this invention it was about ±2.0 mm, and moreover, it spread over the entire length of the section steel. It was confirmed that it is stable with almost the same tendency and dimensions.
（発明の効果）
この発明によれば、従来形鋼の圧延において回避するの
が難しかったウェブ中心の偏りを設備の大型化を伴うこ
となく軽減して、形鋼製品の寸法精度を有利に向上でき
、とくにフリーサイズ化を狙ったウェブ高さの縮小、拡
大といった特殊な圧延・条件においてはその効果は非常
に大きい。(Effects of the Invention) According to this invention, the deviation of the web center, which was difficult to avoid in conventional shape steel rolling, can be reduced without increasing the size of equipment, and the dimensional accuracy of shape steel products is advantageously improved. This is especially effective under special rolling conditions such as reducing or enlarging the web height to achieve free-size webs.
第１図（ａ） （ｂ）は、この発明に従う誘導装置の構
成説明図、
第２図は、この発明に従う誘導装置のとくにガイドの取
りつけ状況を示した図、
第３図（ａ） （ｂ）は、この発明に従う誘導装置の他
の例を示した図、
第４図および第５図は、ウェブ中心の偏り発生状況の説
明図、
第６図は、この発明に従う誘導装置を備えたユニバーサ
ル圧延機の模式図、
第７図は、フランジ脚長の異なる形鋼を製造する場合の
圧延要領説明図、
第８図（ａ）、（ｂ）は、実施例で使用した形材及び圧
延機の模式図である。
１．１′、２，２′・・・ガイド
３・・・昇降手段
４・・・ロールチョックカバー
５・・・ガイドローラ
Ａ・・・形材
Ｈ，Ｈ”・・・水平ロール
■・・ｅ竪ロール
第３図
（ａ）
（ｂ）
第６図
第７図FIGS. 1(a) and (b) are diagrams illustrating the configuration of a guidance device according to the present invention. FIG. ) is a diagram showing another example of the guiding device according to the present invention, FIGS. 4 and 5 are illustrations of the occurrence of deviation in the center of the web, and FIG. 6 is a diagram showing another example of the guiding device according to the present invention. A schematic diagram of a rolling mill. Figure 7 is an explanatory diagram of rolling procedures for manufacturing sections with different flange leg lengths. Figures 8 (a) and (b) are diagrams of the shapes and rolling mill used in the examples. It is a schematic diagram. 1.1', 2, 2'...Guide 3...Elevating means 4...Roll chock cover 5...Guide roller A...Shapes H, H''...Horizontal roll ■...e Vertical roll Figure 3 (a) (b) Figure 6 Figure 7
Claims (1)
又は該圧延機の入側から圧延ロールのロール中心に至る
までの間に配設され、Ｈ形鋼等フランジおよびウェブを
有する形材のフランジの幅端面をそれぞれ上下に挟む左
右一対のガイドとこれら左右各々のガイドの上下におけ
る少なくとも一方を上下方向に移動させる昇降手段を有
する形鋼の誘導装置。 ２、ガイドに、形材のフランジ幅端に当接して転動する
ガイドローラを有する請求項１記載の装置。 ３、フランジおよびウェブを有する形材の該ウェブを上
下から挟むロール幅の変更可能な水平ロールと形材のフ
ランジ面外側からフランジ厚みを圧下する左右一対の竪
ロールを備えたユニバーサル圧延機において、上記ユニ
バーサル圧延機の入側から出側に至るまでの間又は該圧
延機の入側から圧延ロールのロール中心に至るまでの間
に、形材のフランジ幅端面をそれぞれ上下に挟む左右一
対のガイドとこれら左右各々のガイドの上下における少
なくとも一方を上下方向に移動させる昇降手段よりなる
誘導装置を配設したことを特徴とするユニバーサル圧延
機。[Scope of Claims] 1. A flange such as an H-shaped steel, which is disposed between the inlet side and the outlet side of a universal rolling mill or between the inlet side of the rolling mill and the center of the roll of a rolling mill. and a guide device for a section steel, comprising a pair of left and right guides that vertically sandwich the width end faces of a flange of a section having a web, and a lifting means for vertically moving at least one of the left and right guides. 2. The device according to claim 1, wherein the guide includes a guide roller that rolls in contact with the flange width end of the profile. 3. In a universal rolling mill equipped with a horizontal roll whose roll width can be changed to sandwich the web of a section having a flange and a web from above and below, and a pair of left and right vertical rolls that roll down the flange thickness from the outside of the flange surface of the section, A pair of left and right guides that vertically sandwich the flange width end surfaces of the profile material between the entrance side and the exit side of the universal rolling mill or between the entrance side of the rolling mill and the roll center of the rolling roll. A universal rolling mill characterized in that a guiding device comprising a lifting means for vertically moving at least one of the upper and lower guides on each of the left and right guides is provided.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1029995A JPH0615086B2 (en) | 1989-02-10 | 1989-02-10 | Shaped steel guiding device and universal rolling mill equipped with the device |
| US07/367,947 US5009094A (en) | 1988-06-27 | 1989-06-19 | Method of rolling H-shaped steels |
| CA000603720A CA1333532C (en) | 1988-06-27 | 1989-06-23 | Rolling method of h-shaped steels |
| KR1019890008905A KR970000369B1 (en) | 1988-06-27 | 1989-06-27 | Rolling method of h-shaped steels |
| EP89111702A EP0348913B1 (en) | 1988-06-27 | 1989-06-27 | Rolling method of h-shaped steels |
| DE8989111702T DE68905679T2 (en) | 1988-06-27 | 1989-06-27 | METHOD FOR ROLLING DOUBLE T STEEL PROFILES. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1029995A JPH0615086B2 (en) | 1989-02-10 | 1989-02-10 | Shaped steel guiding device and universal rolling mill equipped with the device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02211908A true JPH02211908A (en) | 1990-08-23 |
| JPH0615086B2 JPH0615086B2 (en) | 1994-03-02 |
Family
ID=12291518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1029995A Expired - Fee Related JPH0615086B2 (en) | 1988-06-27 | 1989-02-10 | Shaped steel guiding device and universal rolling mill equipped with the device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0615086B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03118908A (en) * | 1989-09-29 | 1991-05-21 | Kawasaki Steel Corp | Rolling guide for shape |
| JPH03165917A (en) * | 1989-11-24 | 1991-07-17 | Kawasaki Steel Corp | Introducing device for shape steel |
| JP2007196278A (en) * | 2006-01-27 | 2007-08-09 | Jfe Steel Kk | Universal rolling mill and universal rolling method of shape |
| CN102125933A (en) * | 2010-12-24 | 2011-07-20 | 莱芜钢铁股份有限公司 | Universal mill type |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6368204A (en) * | 1986-09-09 | 1988-03-28 | Kawasaki Steel Corp | Rolling device for wide flange beam |
-
1989
- 1989-02-10 JP JP1029995A patent/JPH0615086B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6368204A (en) * | 1986-09-09 | 1988-03-28 | Kawasaki Steel Corp | Rolling device for wide flange beam |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03118908A (en) * | 1989-09-29 | 1991-05-21 | Kawasaki Steel Corp | Rolling guide for shape |
| JPH03165917A (en) * | 1989-11-24 | 1991-07-17 | Kawasaki Steel Corp | Introducing device for shape steel |
| JP2007196278A (en) * | 2006-01-27 | 2007-08-09 | Jfe Steel Kk | Universal rolling mill and universal rolling method of shape |
| CN102125933A (en) * | 2010-12-24 | 2011-07-20 | 莱芜钢铁股份有限公司 | Universal mill type |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0615086B2 (en) | 1994-03-02 |
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