JPH0116201B2 - - Google Patents
Info
- Publication number
- JPH0116201B2 JPH0116201B2 JP9872781A JP9872781A JPH0116201B2 JP H0116201 B2 JPH0116201 B2 JP H0116201B2 JP 9872781 A JP9872781 A JP 9872781A JP 9872781 A JP9872781 A JP 9872781A JP H0116201 B2 JPH0116201 B2 JP H0116201B2
- Authority
- JP
- Japan
- Prior art keywords
- bloom
- rolling
- thickness
- length
- bulge
- 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
Links
- 238000005096 rolling process Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 15
- 238000009749 continuous casting Methods 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 description 16
- 239000000463 material Substances 0.000 description 13
- 241000251468 Actinopterygii Species 0.000 description 10
- 238000003825 pressing Methods 0.000 description 10
- 230000009467 reduction Effects 0.000 description 10
- 238000005520 cutting process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000000452 restraining effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 2
- 244000007853 Sarothamnus scoparius Species 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000037390 scarring Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004088 simulation Methods 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/024—Forging or pressing
-
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/466—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 metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は分塊圧延方法に関し、詳細には、連続
鋳造プロセスにより製造された長方形断面のブル
ームをビレツトに分塊圧延するについて、その圧
延に先立ち、ブルームの両端部にプレス加工を施
して、爾後の圧延によるフイツシユテイルの生成
を抑制し得るようにした分塊圧延方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a blooming method, and more particularly, to a method for blooming a bloom having a rectangular cross section manufactured by a continuous casting process into a billet. The present invention relates to a blooming rolling method in which both ends of the bloom are first pressed to suppress the formation of fish tails during subsequent rolling.
通常の鋼塊を素材として、これを小断面のビレ
ツトに分塊圧延する場合、素材の断面寸法が大き
いと、ロールによる圧下力が内部まで及ばないた
め、該素材の表層部が中心部より大きく延ばされ
て、得られたビレツトの両端にフイツシユテイル
が生成され、また、これが更に進展するときオー
バーラツプが生成される。そして、これら部位は
クロツプとして切除されるが、これらによるロス
量は、３〜６％にも達する。
When a normal steel ingot is used as a raw material and is bloomed into a billet with a small cross-section, if the cross-sectional dimension of the material is large, the rolling force by the rolls will not reach the inside, so the surface layer of the material will be larger than the center part. As it stretches, fishtails are created at both ends of the resulting billet, and as it develops further, an overlap is created. These parts are removed as crops, but the amount of loss due to them reaches 3 to 6%.
そこで、従来においては、分塊圧延される鋼塊
の両端部の形状に種々の改善を加え、フイツシユ
テイルやオーバーラツプの生成を極力小さくする
努力がなされ、所期の目的が達成されている。 Therefore, in the past, efforts have been made to minimize the formation of fishtails and overlaps by making various improvements to the shape of both ends of the steel ingot to be bloomed, and the desired objective has been achieved.
一方、近時においては、造塊〜分塊圧延の工程
における材料ロスおよび熱エネルギーロスを減少
させるため、連続鋳造プロセスが積極的に導入さ
れている。 On the other hand, in recent years, continuous casting processes have been actively introduced in order to reduce material loss and thermal energy loss in the steps of ingot making and blooming.
しかし、従来、これら連続鋳造プロセスにて製
造されたブルームを分塊圧延するに際し、これら
ブルームの両端部の形状に何らの考慮がなされて
いないために、前述の如き、フイツシユテイルあ
るいはオーバーラツプが生成されて、その歩留り
の低下を招いているのが現状である。 However, when blooms manufactured by these continuous casting processes are conventionally bloomed and rolled, no consideration has been given to the shape of both ends of the blooms, resulting in the formation of fishtails or overlaps as described above. The current situation is that this leads to a decrease in yield.
周知のように、圧延により生成されるフイツシ
ユテイルあるいはオーバーラツプの量、すなわち
端部変移量ΔLは、圧延ロール径および圧下量を
一定とするとき、第７図のグラフに示す如く、被
圧延材の入側厚さＨにより変動し、その入側厚さ
Ｈがある程度以上となると、その増加に伴い、該
グラフに示すプラス側に変動する。なお、該グラ
フに示す端部変移量ΔLのプラス側への変移は、
被圧延材の表層部の偏つた延伸、すなわちフイツ
シユテイルの形成を意味する。 As is well known, the amount of fish tail or overlap generated by rolling, that is, the amount of end displacement ΔL, is determined by the input of the material to be rolled, as shown in the graph of FIG. 7, when the rolling roll diameter and rolling reduction amount are constant. It varies depending on the side thickness H, and when the entrance side thickness H exceeds a certain level, as it increases, it changes to the positive side shown in the graph. In addition, the shift of the end displacement amount ΔL shown in the graph to the plus side is
This refers to the uneven stretching of the surface layer of a material to be rolled, that is, the formation of fish tails.
従つて、連続鋳造プロセスにて製造された長方
形断面のブルームを圧延するとき、当該ブルーム
の端面が切断されたままの平面を呈している限
り、その原断面寸法が大きくなるほど、圧延によ
るフイツシユテイルの生成が増加し、更に、その
長辺方向に圧下を加えるとき、その入側厚さが短
辺方向より大きいため、特に、この長辺方向にお
けるフイツシユテイルの生成が助長されて顕著と
なり、これによるクロツプロス量が増大して、そ
の圧延歩留りの大幅な低下を招くことになる。 Therefore, when rolling a bloom with a rectangular cross section manufactured by a continuous casting process, as long as the end face of the bloom remains cut and flat, the larger the original cross-sectional dimension, the more fish tails are formed by rolling. increases, and furthermore, when rolling is applied in the direction of the long side, since the thickness at the entrance side is larger than that in the direction of the short side, the formation of fishtails in the long side direction is particularly promoted and becomes noticeable, resulting in the amount of clotpulosus. increases, resulting in a significant decrease in rolling yield.
本発明は上記問題点を解消すべく、連続鋳造プ
ロセスにて製造された長方形断面のブルームの両
端部の形状に検討を加え、その両端部の形状とフ
イツシユテイル生成のメカニズムとの関連を鋭意
追述した結果、圧延に先立ち、これらブルームの
両端部に、ある条件下にてプレス加工を施すと、
その両端部の形状を、爾後の圧延によるフイツシ
ユテイルの生成を抑制し得るものとすることがで
きるとの知見を得て、なされたものである。 In order to solve the above problems, the present invention has examined the shape of both ends of a bloom with a rectangular cross section manufactured by a continuous casting process, and has carefully added the relationship between the shape of both ends and the mechanism of fishtail formation. As a result, if both ends of these blooms are pressed under certain conditions prior to rolling,
This was done based on the knowledge that the shapes of both ends can be made to suppress the formation of fish tails during subsequent rolling.
圧延によるフイツシユテイルの生成を抑制して
クロツプロス量の低減を達成するために、本発明
は以下を要旨としている。すなわち、本発明にお
ける分塊圧延方法は、連続鋳造プロセスによつて
製造された縦横寸法比が１：1.2以上の長方形断
面のブルームを、正方形断面のビレツトに分塊圧
延するに際し、圧延に先立つて、ブルームの両端
部それぞれの端面より少なくとも250mmの範囲を、
上下一対のダイスにより、ブルームの両長方側面
の膨出を拘束しながら、その短辺間の厚さを所定
厚さまで減厚させて、ブルームの両側面それぞれ
に舌状の膨出部を形成させるプレス加工を施すも
のである。
In order to suppress the formation of fish tails due to rolling and achieve a reduction in the amount of clots loss, the present invention has the following gist. That is, in the blooming method of the present invention, when a bloom having a rectangular cross section and having a length-width dimension ratio of 1:1.2 or more is bloomed by a continuous casting process into a billet having a square cross-section, the blooming process is carried out prior to rolling. , an area of at least 250mm from each end of the bloom,
A pair of upper and lower dies restrains the bulge on both long sides of the bloom, while reducing the thickness between the short sides to a predetermined thickness, forming tongue-shaped bulges on each side of the bloom. It is press-worked to make it look like this.
周知のように、分塊圧延される材料の両端面
に、例えば、分塊圧延用の鋼塊の両端側に適用さ
れているように、その端部に角または円錐台状の
凸部を設けたり、または、その端面を球面状に膨
出させたりしておくと、爾後の圧延において表層
部で偏つて延伸される材料は、これら凸部に吸収
されて、フイツシユテイルの生成が抑制される。
As is well known, a corner or truncated cone-shaped protrusion is provided on both end faces of a material to be bloomed, as is applied, for example, to both ends of a steel ingot for blooming. Or, if the end face is bulged into a spherical shape, the material that is unevenly stretched in the surface layer portion during subsequent rolling is absorbed by these convex portions, and the formation of fish tails is suppressed.
従つて、連続鋳造プロセスにて製造された長方
形断面のブルーム（以下ブルームと略記する）の
両端面部に、上記のような凸部ないしは膨出部を
形成しておくことで、爾後の圧延によるフイツシ
ユテイルの生成を抑制することが可能となる。 Therefore, by forming the above-mentioned protrusions or bulges on both end faces of a bloom with a rectangular cross section (hereinafter abbreviated as bloom) manufactured by a continuous casting process, it is possible to prevent the fishtail from rolling afterward. This makes it possible to suppress the generation of
本発明者等は、上記観点より、圧延に先立ち、
プレス加工により、ブルームの両端面に球面状の
膨出部を形成させ、これによりフイツシユテイル
の生成を抑制することを図つた。 From the above viewpoint, the present inventors, prior to rolling,
By pressing, spherical bulges were formed on both end faces of the bloom, thereby suppressing the formation of fish tails.
しかし、ブルームの端部の側辺方向よりプレス
加圧して、当該部位を減厚させることで、その端
面に球面状の膨出部を形成させようとすると、加
圧・減厚部の端面からの長さ如何によつて、爾後
の圧延に支障をきたすような大きな端部減厚を要
したり、90度二方向からの加圧工程を要したり、
また、所期の目的と反して端面がフイツシユテイ
ル状を呈したりして、安定した成形が果たせず、
特に、比較的に大きな断面形状のブルームについ
て、その傾向が顕著であつた。 However, if you try to form a spherical bulge on the end face by applying pressure from the side direction of the end of the bloom to reduce the thickness of that area, it will be difficult to Depending on the length, it may be necessary to reduce the thickness of the end so much that it will interfere with subsequent rolling, or it may require pressing from two directions at 90 degrees.
In addition, the end surface may take on a fishtail shape, which is contrary to the intended purpose, and stable molding cannot be achieved.
This tendency was particularly noticeable for blooms with relatively large cross-sectional shapes.
そこで、本発明者等は、プラステイシン（油性
粘土）を用い、ブルーム形状に対応する断面形状
のモデルを準備し、これにより種々のシユミレー
シヨンを繰り返して、ブルーム端部の加圧成形条
件と、その端面の膨出部の形成状況との関連を調
査した。そして、これら調査結果を詳細に検討し
た結果、ブルームの両長辺側面の膨出を拘束しな
がら、短辺間の厚さを加圧・減厚させて、このブ
ルーム端面に舌状の膨出部を成形させると、爾後
の圧延におけるフイツシユテイルの生成を抑制す
るに有効であり、かつ、その舌状膨出量は、ブル
ーム端面からの加圧・減厚部の長さに依存すると
の知見を得た。 Therefore, the present inventors used plasticine (oil-based clay) to prepare a model with a cross-sectional shape corresponding to the bloom shape, and by repeating various simulations with this model, the pressure forming conditions of the bloom end and its We investigated the relationship with the formation of the bulge on the end face. As a result of a detailed study of these survey results, we decided to pressurize and reduce the thickness between the short sides while restraining the bulge on both long sides of the bloom, resulting in a tongue-shaped bulge on the end face of the bloom. The knowledge that shaping the part is effective in suppressing the formation of fish tails during subsequent rolling, and that the amount of the tongue-shaped bulge depends on the length of the pressurized/thickened part from the bloom end face. Obtained.
この知見に基づき、更に、ブルーム端面からの
加圧・減厚部の長さと、圧下量を種々に変えた条
件下で、ブルームの両長辺側面の膨出を拘束しな
がら、短辺間の厚さを加圧・減厚させ、それぞれ
のブルーム端面の舌状膨出量の変化を調べた。 Based on this knowledge, under conditions where the length of the pressurized/thickened part from the end face of the bloom and the amount of reduction were varied, the bulge between the short sides was restrained while the bulge on both long sides of the bloom was restrained. The thickness was pressurized and reduced, and changes in the amount of tongue-like bulge on the end face of each bloom were investigated.
その結果を第８図のグラフに示す。なお、第８
図のグラフ中の●印のプロツトは圧下量を50mmと
した例、×印のプロツトは圧下量を100mmとした
例、〇印のプロツトは圧下量を150mmとした例を
それぞれ示し、また、グラフ中のマイナスの領域
にプロツトされたものは、ブルーム端面が凹状、
すなわちフイツシユテイル状を呈した例を示す。 The results are shown in the graph of FIG. In addition, the 8th
In the graph of the figure, the plots marked with ● are examples where the amount of reduction is 50 mm, the plots marked with × are examples where the amount of reduction is 100 mm, and the plots marked with ○ are examples where the amount of reduction is 150 mm. Those plotted in the negative area in the middle have a concave bloom end surface.
In other words, an example exhibiting a fishtail shape is shown.
第８図のグラフに明らかなように、ブルーム端
面からの加圧・減厚部の長を、250mm以上とする
ことで、ブルームの端面に舌状の膨出部を形成さ
せることができる。 As is clear from the graph of FIG. 8, by setting the length of the pressurized/thickened portion from the end face of the bloom to 250 mm or more, a tongue-shaped bulge can be formed on the end face of the bloom.
本発明においては、圧延に先立つて、ブルーム
の両端部それぞれの端面より少なくとも250mmの
範囲を、上下一対のダイスにより、ブルームの両
長辺側面の膨出を拘束しながら、その短辺間の厚
さを所定厚さまで減厚させるプレス加工を施すの
で、当該ブルームの両端面それぞれに舌状の膨出
部を確実に形成し得て、爾後の圧延によるフイツ
シユテイルの生成を抑制し得る。 In the present invention, prior to rolling, an area of at least 250 mm from the end face of each end of the bloom is covered with a pair of upper and lower dies, while restraining the bulge of both long sides of the bloom, and thickness between the short sides. Since the press work is performed to reduce the thickness of the bloom to a predetermined thickness, tongue-shaped bulges can be reliably formed on each of both end faces of the bloom, and the formation of fish tails due to subsequent rolling can be suppressed.
以下に、本発明の実施例を図面を参照して説明
する。
Embodiments of the present invention will be described below with reference to the drawings.
第１実施例
第１図ａは本発明の第１実施例のプレス加工に
用いるダイスを示す正断面図であり、第１図ｂは
第１図ａのＡ−Ａ断面である。First Embodiment FIG. 1a is a front sectional view showing a die used for press working according to a first embodiment of the present invention, and FIG. 1b is a cross-sectional view taken along the line A-A in FIG. 1a.
第１図ａおよび第１図ｂにおいて、１は上ダイ
ス、２は下ダイスであつて、これら上下ダイス
１，２は、上下方向に対をなして配設され、ここ
では図示を省略したプレスの加工手段に、それぞ
れ連結されてある。３はブルームであつて、ここ
では、その長辺方向を上下方向として、一方の端
部を上下ダイス１，２間に装入した状態を示す。 In FIG. 1a and FIG. 1b, 1 is an upper die and 2 is a lower die, and these upper and lower dies 1 and 2 are arranged in a pair in the vertical direction, and a press (not shown) is shown in FIG. These processing means are connected to each other. 3 is a bloom, and here, one end thereof is inserted between the upper and lower dies 1 and 2, with the long side direction being the up-down direction.
また、上下ダイス１，２は、それぞれの作業面
側に、ブルーム３の両長辺側面を拘束して材料の
側面方向への膨出を規制するための平行な両側壁
５を備えたコの字状の断面形状とされ、ブルーム
３を加圧・減厚する長さに対応させた軸方向長
さ、すなわち減厚部長さＸを有するカリバー４を
備えて一対をなすものとされてある。 In addition, the upper and lower dies 1 and 2 are equipped with parallel side walls 5 on their respective working surfaces for restraining both long sides of the bloom 3 and restricting the material from expanding in the lateral direction. A pair of calibers 4 are provided which have a letter-shaped cross-sectional shape and have an axial length corresponding to the length of pressurizing and reducing the thickness of the bloom 3, that is, a reduced thickness section length X.
本実施例の上下ダイス１，２には、カリバー４
に続く一方の端部に、該カリバー４に続く平行な
両側壁５を有し、その底面を反加圧方向に向かつ
て拡大させた傾斜面部６が設けられてあり、ブル
ーム３を圧下・減厚したとき、その減厚部と原寸
法部との移行部に斜面を形成させて、当該ブルー
ム３を圧延するに際して、該移行部に折れ込み等
の欠陥の発生を回避するようにされてある。ま
た、これらカリバー４に続く他方の端部には、ブ
ルーム３を装入する際にストツパーとしての役割
を果たすと共に、ブルーム３を圧下・減厚させた
ときに、その端面に膨出する材料が、良好なる舌
状の膨出部を形成するように案内・規制するため
に、その内側面を角度θで端部に向かつて傾斜さ
せた堰部７が設けられてある。 The upper and lower dies 1 and 2 of this embodiment include caliber 4
At one end following the caliber 4, there is provided an inclined surface section 6 which has parallel both side walls 5 following the caliber 4 and whose bottom surface is enlarged in the opposite direction of pressure. When the bloom 3 is thickened, a slope is formed at the transition part between the reduced thickness part and the original dimension part to avoid defects such as folding in the transition part when rolling the bloom 3. . In addition, the other end following these calibers 4 plays a role as a stopper when charging the bloom 3, and when the bloom 3 is rolled down and reduced in thickness, the material that bulges out on the end surface is stored. In order to guide and regulate the formation of a good tongue-shaped bulge, a dam 7 is provided whose inner surface is inclined at an angle θ toward the end.
本実施例においては、上記構成を具備し、その
カリバー４の減厚部長さＸを400mmとした対の上
下ダイスと、300mmとした対の上下ダイスとを準
備して、これら上下ダイスを用いて、長辺の長さ
が600mm、短辺の長さが400mmの長方形断面のブル
ームにプレス加工を施した。 In this example, a pair of upper and lower dies having the above-mentioned configuration and a pair of upper and lower dies with the thickness reduction part length , a bloom with a rectangular cross section with a long side length of 600 mm and a short side length of 400 mm was pressed.
プレス加工はブルームの両端部について施し、
カリバーの減厚部長さＸを400mmとした上下ダイ
スを用いたプレス加工（No.１の例）においては、
搬送ロール上に支持されたブルームの両端部それ
ぞれの端面から400mmを加圧・減厚させ、一方、
カリバーの減厚部長さＸを300mmとした上下ダイ
スを用いたプレス加工（No.２の例）においては、
搬送ロール上に支持されたブルームの中間部を把
持し、その軸方向の移動を規制して両端部それぞ
れの端面か300mmを加圧・減厚させた。なお、減
厚部の圧下量は、両者共に100mmとした。 Pressing is done on both ends of the bloom.
In press processing using upper and lower dies (example No. 1) with the reduced thickness part length X of the caliber being 400 mm,
Pressurize and reduce the thickness of 400 mm from each end face of the bloom supported on the conveyor roll, while
In press processing using upper and lower dies (example No. 2) with the reduced thickness part length X of the caliber being 300 mm,
The middle part of the bloom supported on the transport roll was gripped and its axial movement was restricted, and the end faces of each end were pressurized and reduced in thickness by 300 mm. Note that the reduction amount of the reduced thickness portion was 100 mm in both cases.
上記のプレス加工を施した後にブルーム両端面
に形成された舌状膨出部を測定したところ、No.１
の例では、最大部で21mm膨出しており、一方、No.
２の例では、最大部で46mm膨出していた。 When the tongue-shaped bulges formed on both end faces of the bloom were measured after the above pressing process, No. 1 was found.
In the example of No. 2, the maximum part bulges out by 21 mm, while No.
In case 2, the bulge was 46 mm at its maximum.
これら結果より、本実施例のプレス加工（No.１
およびNo.２の例）によりブルームの両端面に確実
に舌状膨出部を形成させることができ、さらに、
そのプレス加工時にブルームの軸方向の移動を規
制して、またはブルームをダイス方向に積極的に
押付けて、上下ダイスの加圧・減厚に伴う反端面
方向への材料の流動および移動を防ぐ背圧を付与
すると、減厚部の長さＸが短い場合においてもそ
の膨出量を大きくし得ることが確認された。 From these results, the press processing of this example (No. 1
and Example No. 2), tongue-like bulges can be reliably formed on both end surfaces of the bloom, and further,
During the pressing process, the axial movement of the bloom is restricted or the bloom is actively pressed toward the die to prevent the flow and movement of the material in the opposite end face direction due to pressurization and thinning of the upper and lower dies. It was confirmed that when pressure is applied, the amount of bulge can be increased even when the length X of the reduced thickness portion is short.
次いで、上記のプレス加工（No.１およびNo.２の
例）を施したブルームを分塊圧延し、６パスの圧
延を繰り返した時点と、更に圧延を加え13パスの
圧延を繰り返した時点において、これらの両端部
に生成されたフイツシユテイルやオーバーラツプ
に起因するクロツプロスの長さを測定した。 Next, the bloom subjected to the above press working (Examples No. 1 and No. 2) was subjected to bloom rolling, and at the time when rolling was repeated for 6 passes, and at the time when further rolling was added and rolling was repeated for 13 passes. We measured the length of the fishtails and clots produced at both ends of these two ends.
その結果を、ブルームの端部になんらの加工を
加えずに同様の圧延を繰り返した比較例との対比
にて、第５図のグラフに示す。 The results are shown in the graph of FIG. 5 in comparison with a comparative example in which the same rolling was repeated without applying any processing to the edges of the bloom.
第５図のグラフに示すように、本実施例（No.１
およびNo.２の例）のものは、比較例のものに比
べ、クロツプロス量を40〜55％と大幅に減少させ
ることができ、本発明の優れた効果が確認され
た。 As shown in the graph of FIG.
In Example No. 2 and No. 2), the amount of clotupulos was significantly reduced by 40 to 55% compared to the comparative example, confirming the excellent effect of the present invention.
なお、本実施例においては、上下ダイス１，２
のカリバー４に続く端部に、その内側面の傾斜角
度θを30度とした堰部７を設けたが、これは、前
述のように、ブルーム３の端面に良好なる舌状の
膨出部を形成するように案内・規制することを目
的とするもので、その主旨に反しない限り、他の
構成のものとされても良く、また、これを設け
ず、カリバー４を端面まで延長させても良い。 In addition, in this embodiment, the upper and lower dice 1 and 2
A weir part 7 with an inclination angle θ of 30 degrees on the inner surface is provided at the end following the caliber 4 of the bloom 3. As mentioned above, this is a good tongue-shaped bulge on the end face of the bloom 3. The purpose of this is to guide and control the caliber 4 to form a caliber 4, and as long as it does not contradict the purpose, other configurations may be used, or the caliber 4 may be extended to the end face without this. Also good.
また、プレス加工により、ブルーム端部の短辺
間の厚さを減厚させ、この減厚に伴う材料の流動
を円滑に端面の舌状膨出部の成形に向かわせるた
めには、その加圧・減厚部における両長辺側面の
膨出を、可能な限り規制することが必要となる。 In addition, in order to reduce the thickness between the short sides of the end of the bloom by pressing, and to smoothly direct the flow of material accompanying this thickness reduction to form the tongue-shaped bulge on the end surface, it is necessary to It is necessary to restrict the bulge of both long side surfaces in the compressed/thickened part as much as possible.
この両長辺側面の膨出を規制するために、本実
施においては、上下ダイス１，２に、平行な両側
壁５を有するコの字状の断面形状とされたカリバ
ー４を設けて対応するものとしたが、これは一例
であつて、この構成に代わり、例えば、第３図に
示すように、下ダイス１２を二分割型とすると共
に、その両側壁１４高さを大きく設けて、これら
両側壁１５にてブルーム１３の両長辺側面の膨出
を規制する一方、上ダイス１１を下ダイス１２の
両側壁１４間に嵌入させて、ブルーム１３を加圧
する構成とされても良く、また、第４図に示すよ
うに、上下ダイス１５，１６の両側に一対のガイ
ドフレーム１８を配設し、これらガイドフレーム
１８にて、ブルーム１７の両長辺側面の膨出を規
制する一対の規制部材１９を、上下摺動自由に支
持する構成とされても良い。 In order to control this bulge on both long sides, in this embodiment, the upper and lower dies 1 and 2 are provided with a caliber 4 having a U-shaped cross section with parallel side walls 5. However, this is just an example, and instead of this configuration, for example, as shown in FIG. The bloom 13 may be configured to be pressurized by fitting the upper die 11 between the both side walls 14 of the lower die 12 while the both side walls 15 restrict the expansion of both long sides of the bloom 13. As shown in FIG. 4, a pair of guide frames 18 are provided on both sides of the upper and lower dies 15 and 16, and these guide frames 18 provide a pair of restraints for restricting the expansion of both long sides of the bloom 17. The member 19 may be configured to be supported so as to be freely slidable up and down.
第２実施例
第２図は本発明の第１実施例のプレス加工に用
いるダイスを示す正断面図である。Second Embodiment FIG. 2 is a front sectional view showing a die used for press working according to the first embodiment of the present invention.
なお、本実施例のダイスは、そのカリバーの端
底部に背切り凸部を設けた点以外は、前述の第１
実施例と同一構成のものであり、ここでは、その
差異点のみ概略説明するものとする。 The die of this example is similar to the first die described above, except that a back-cutting convex portion is provided at the bottom of the end of the caliber.
It has the same configuration as the embodiment, and only the differences will be briefly explained here.
第２図において、１は上ダイス、２は下ダイ
ス、４はカリバー、５は側壁、６は傾斜面部、７
は堰部、Ｘは減厚部長さであつて、これらは前述
の第１実施例と同じものである。 In Fig. 2, 1 is the upper die, 2 is the lower die, 4 is the caliber, 5 is the side wall, 6 is the inclined surface part, and 7 is the upper die.
is the weir portion, and X is the length of the reduced thickness portion, which are the same as in the first embodiment described above.
８は背切り凸部であつて、この背切り凸部８
は、カリバー４の傾斜面部６側の端底面に突出し
て設けられ、その高さｈと幅ｂとは、ブルームを
圧延した後に表面疵として残留しない範囲に設定
されてある。この背切り凸部８は、ブルームのプ
レス加工に際して、材料の反端面側への流動を抑
制し、ブルーム端面の舌状膨出部の形成を促進さ
せるものである。 8 is a back cutting convex part, and this back cutting convex part 8
is provided protrudingly from the end bottom surface of the caliber 4 on the side of the inclined surface portion 6, and its height h and width b are set within a range that does not remain as a surface flaw after the bloom is rolled. The back-cut convex portion 8 suppresses the flow of material toward the opposite end surface during press working of the bloom, and promotes the formation of a tongue-like bulge on the end surface of the bloom.
本実施例においては、上記構成を具備し、背切
り凸部８の高さｈを40mm、幅ｂを150mmとし、こ
れを含むカリバー４の減厚部長さＸを400mmとし
た対の上下ダイスと、背切り凸部８の高さｈを40
mm、幅ｂを100mmとし、これを含む減厚部長さＸ
を300mmとした対の上下ダイスとを用いて、前述
の第１実施例と同一の長辺の長さ600mm、短辺の
長さ400mmのブルームにプレス加工を施した。 In this embodiment, a pair of upper and lower dies having the above-mentioned configuration, the height h of the back-cutting convex portion 8 being 40 mm, the width b being 150 mm, and the length X of the reduced thickness portion of the caliber 4 including this being 400 mm. , the height h of the back cutting protrusion 8 is 40
mm, width b is 100mm, reduced thickness part length including this
Using a pair of upper and lower dies with a diameter of 300 mm, a bloom having a long side length of 600 mm and a short side length of 400 mm, which is the same as in the first example described above, was pressed.
プレス加工は第１実施例と同様に施した。すな
わち、カリバーの減厚部長さＸを400mmとした上
下ダイスを用いたプレス加工（No.３の例）におい
ては、ブルームの両端部それぞれの端面から400
mmを加圧・減厚させ、一方、カリバーの減厚部長
さＸを300mmとした上下ダイスを用いたプレス加
工（No.４の例）においては、ブルームの中間部を
把持し、その両端部それぞれの端面から300mmを
加圧・減厚させた。また、減厚部の圧下量は、両
者共に100mmとした。 Pressing was performed in the same manner as in the first example. In other words, in press working using upper and lower dies (example No. 3) with the reduced thickness part length
In press processing using upper and lower dies (example No. 4) in which the reduced thickness of the caliber is pressurized and reduced in thickness by 300 mm, the middle part of the bloom is gripped and both ends are Pressure was applied and the thickness was reduced by 300 mm from each end face. Further, the reduction amount of the reduced thickness portion was 100 mm in both cases.
上記のプレス加工を施した後にブルーム両端面
に形成された舌状膨出部を測定したところ、No.３
の例では、最大部で28mm膨出しており、一方、No.
４の例では、最大部で62mm膨出していた。 When the tongue-shaped bulges formed on both end faces of the bloom were measured after the above pressing process, No. 3 was found.
In the example of No., it bulges out by 28mm at its maximum point, while No.
In case 4, the bulge was 62 mm at its maximum.
これら結果より、カリバー４の傾斜面部６側の
端底面に適切な形状の背切り凸部８を設けた上下
ダイス１，２を用いてプレス加工するとき、ブル
ームの両端面により確実に舌状膨出部を形成させ
得ることが確認された。 From these results, when pressing using the upper and lower dies 1 and 2, which are provided with an appropriately shaped back-cut convex portion 8 on the end bottom surface on the inclined surface portion 6 side of the caliber 4, the tongue-like expansion is ensured by the both end surfaces of the bloom. It was confirmed that a protrusion can be formed.
次いで、プレス加工（No.３およびNo.４の例）を
施したブルームに、第１実施例と同様に、それぞ
れ６パスおよび13パスの圧延を繰り返した時点に
おいて、そのクロツプロスの長さを測定した。そ
の結果を第５図のグラフに示す。 Next, the blooms subjected to press working (examples No. 3 and No. 4) were repeatedly rolled for 6 passes and 13 passes, respectively, in the same manner as in the first example, and the length of the clotsupuros was measured. did. The results are shown in the graph of FIG.
第５図のグラフに示すように、本実施例（No.３
およびNo.４の例）のものは、第１実施例と同様
に、その両端部になんらの加工を加えずに圧延し
た比較例のものに比べ、クロツプロスを40〜55％
と大幅に減少させことができ、本発明の優れた効
果が確認された。 As shown in the graph of FIG.
and Example No. 4) have 40 to 55% clotsupuros compared to the comparative example in which both ends were rolled without any processing, similar to the first example.
The excellent effects of the present invention were confirmed.
次に、本発明の分塊圧延方法を実施する場合の
設備レイアウトの一例を第６図に示し、これによ
る分塊圧延の工程を以下に説明する。 Next, an example of the equipment layout when carrying out the blooming method of the present invention is shown in FIG. 6, and the blooming process using this will be explained below.
連鋳機２１により連続鋳造され、続いて、ガス
カツター２２により所定長さに分割切断された長
方形断面のブルームＢ、あるいは、更に加熱炉２
３により加熱されたブルームＢを、例えば、第１
図に示す前述の一対の上下ダイスを具備するプレ
ス装置２４に送給し、これらブルームＢの両端部
に、前述の第１実施例の如き、プレス加工を施
す。 A bloom B having a rectangular cross section is continuously cast by a continuous casting machine 21 and then cut into predetermined lengths by a gas cutter 22, or further by a heating furnace 2.
For example, the bloom B heated by the first
The broom B is fed to a press device 24 equipped with the above-mentioned pair of upper and lower dies shown in the figure, and press working is performed on both ends of these blooms B as in the above-mentioned first embodiment.
続いて、第一分塊圧延機２５により、所定寸法
まで圧延を加えた後に、場合によりホツトスカー
フアー２６により表面疵を溶削除去し、連続圧延
機２７により所定断面寸法のビレツトまで圧延を
行い、次いで、剪断機２６により所定ビレツト長
さに定寸切断を行い、その分塊圧延の工程を完了
させる。 Subsequently, after rolling to a predetermined size using the first blooming mill 25, surface flaws are removed by hot scarring 26 if necessary, and rolling is performed using the continuous rolling mill 27 to a billet with a predetermined cross-sectional dimension. Next, the billet is cut to a predetermined length using a shearing machine 26, and the blooming process is completed.
以上に述べたように、連続鋳造プロセスによつ
て製造された長方形断面のブルームの両端部に、
圧延に先立ち、プレス加工を施して、その両端面
に舌状の膨出部を形成させる本発明に係る分塊圧
延方法は、圧延によるフイツシユテイルの生成を
抑制し得て、クロツプロス量を著しく低減し得、
その圧延歩留りを向上させることが可能であつ
て、その奏する効果は極めて大なるものである。
As mentioned above, at both ends of the bloom with a rectangular cross section manufactured by the continuous casting process,
The blooming method according to the present invention, in which press working is performed prior to rolling to form tongue-shaped bulges on both end faces, can suppress the formation of fishtails due to rolling and significantly reduce the amount of clotsupuros. Gain,
It is possible to improve the rolling yield, and the effect produced is extremely large.
第１図ａは本発明の第１実施例のダイスを示す
正断面図、第１図ｂは第１図ａのＡ−Ａ断面、第
２図は本発明の第２実施例のダイスを示す正断面
図、第３図および第４図はダイスの他の変形実施
態様を示す断面図、第５図は圧延後のクロツプロ
ス長さを示すグラフ、第６図は本発明を実施する
場合の設備レイアウトの一例を示す説明図、第７
図は分塊圧延における材料の入側厚さと端部変移
量との関係を示すグラフ、第８図はプレス加工に
よる減厚部長さと舌状膨出量との関係を示すグラ
フである。
１……上ダイス、２……下ダイス、３……ブル
ーム、４……カリバー、５……側壁、Ｘ……減厚
部長さ。
FIG. 1a is a front sectional view showing a die according to a first embodiment of the present invention, FIG. 1b is a cross-sectional view taken along line AA in FIG. 1a, and FIG. 2 is a front sectional view showing a die according to a second embodiment of the present invention. A front sectional view, FIGS. 3 and 4 are sectional views showing other modified embodiments of the die, FIG. 5 is a graph showing the length of the clots after rolling, and FIG. 6 is an equipment for carrying out the present invention. Explanatory diagram showing an example of layout, No. 7
The figure is a graph showing the relationship between the entrance side thickness of the material and the amount of end displacement during blooming, and FIG. 8 is a graph showing the relationship between the reduced thickness section due to press working and the amount of tongue-like bulge. 1...Upper die, 2...Lower die, 3...Bloom, 4...Caliber, 5...Side wall, X...Length of reduced thickness.
Claims (1)
法比が１：1.2以上の長方形断面のブルームを、
正方形断面のビレツトに分塊圧延するに際し、圧
延に先立つて、ブルームの両端部それぞれの端面
より少なくとも250mmの範囲を、上下一対のダイ
スにより、ブルームの両長辺側面の膨出を拘束し
ながら、その短辺間の厚さを所定厚さまで減厚さ
せて、ブルームの両端面それぞれに舌状の膨出部
を形成させるプレス加工を施すことを特徴とする
分塊圧延方法。1 A bloom with a rectangular cross section with a vertical and horizontal dimension ratio of 1:1.2 or more manufactured by a continuous casting process,
When blooming into a billet with a square cross section, prior to rolling, a pair of upper and lower dies are used to restrain the expansion of both long side surfaces of the bloom in an area of at least 250 mm from the end face of each end of the bloom. A blooming rolling method characterized by reducing the thickness between the short sides to a predetermined thickness and performing press working to form tongue-shaped bulges on each of both end faces of the bloom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9872781A JPS58301A (en) | 1981-06-24 | 1981-06-24 | Blooming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9872781A JPS58301A (en) | 1981-06-24 | 1981-06-24 | Blooming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58301A JPS58301A (en) | 1983-01-05 |
| JPH0116201B2 true JPH0116201B2 (en) | 1989-03-23 |
Family
ID=14227550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9872781A Granted JPS58301A (en) | 1981-06-24 | 1981-06-24 | Blooming method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58301A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61132201A (en) * | 1984-11-30 | 1986-06-19 | Nippon Kokan Kk <Nkk> | Rolling method of billet |
| JPH0340401Y2 (en) * | 1985-05-27 | 1991-08-26 |
-
1981
- 1981-06-24 JP JP9872781A patent/JPS58301A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58301A (en) | 1983-01-05 |
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