JPH04356301A - Manufacture of titanic slab - Google Patents
Manufacture of titanic slabInfo
- Publication number
- JPH04356301A JPH04356301A JP12999291A JP12999291A JPH04356301A JP H04356301 A JPH04356301 A JP H04356301A JP 12999291 A JP12999291 A JP 12999291A JP 12999291 A JP12999291 A JP 12999291A JP H04356301 A JPH04356301 A JP H04356301A
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- slab
- ingot
- width
- thickness
- 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.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 49
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 14
- 239000010936 titanium Substances 0.000 claims description 14
- 229910052719 titanium Inorganic materials 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 8
- 238000007688 edging Methods 0.000 abstract description 5
- 238000007373 indentation Methods 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Metal Rolling (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は、チタン丸柱鋳塊の分塊
圧延機によるスラブ、ブルームおよびビレット等の製造
における歩留り向上技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving yield in the production of slabs, blooms, billets, etc. using a blooming mill for titanium round column ingots.
【0002】0002
【従来の技術】チタンの丸柱鋳塊を直接分塊圧延するこ
とによるスラブ製造自体は、特開昭56−163001
号公報、特開昭56−32023号公報等に開示されて
いるように既に公知である。[Prior Art] The manufacture of slabs by direct blooming rolling of titanium round column ingots was disclosed in Japanese Patent Application Laid-Open No. 56-163001.
This method is already known as disclosed in Japanese Patent Application Laid-open No. 56-32023 and the like.
【0003】ところが、このチタン丸柱鋳塊の直接分塊
圧延は、圧延の際、丸柱鋳塊の幅方向の中央部の圧下代
が最も大きくなり、中央部のメタルフローが最も大きく
、側部は中央部に追従して延伸されることになる。この
ため、スラブ下面のクロップには舌状のオーバーラップ
を形成し、同時に側面にもメカニカルパイプが発生し、
切捨て量が多く歩留りは低い水準にある。However, in this direct blooming rolling of titanium round column ingots, during rolling, the rolling stock in the center in the width direction of the round column ingot is the largest, the metal flow in the center is the largest, and the side parts are It will be stretched to follow the central part. Therefore, a tongue-shaped overlap is formed on the crop on the bottom surface of the slab, and at the same time, a mechanical pipe is generated on the side surface.
There is a large amount of truncation and the yield is at a low level.
【0004】その対策の一つとして、特開昭59−22
5801号公報には、丸柱鋳塊の端部に鍛造によって先
細りテーパー部を形成したのち分塊圧延にかけることが
開示され、また、特開昭62−214802号公報には
、この鍛造によるテーパー部の形成に代えて、圧延中に
分塊圧延ロールを端部に一旦噛み込ませたのち噛み戻し
を行って押し込み部を形成することが開示されている。[0004] As one of the countermeasures, Japanese Unexamined Patent Publication No. 59-22
No. 5801 discloses that a tapered portion is formed at the end of a round column ingot by forging and then subjected to blooming rolling, and Japanese Patent Application Laid-Open No. 62-214802 discloses that a tapered portion is formed by forging at the end of a round column ingot and then subjected to blooming rolling. It has been disclosed that instead of forming a push-in portion, a blooming roll is once bitten into the end portion during rolling and then bitten back.
【0005】この方法は、圧延スケジュール中の初期段
階で、鋳塊の両端部を噛み込み、噛み戻しによって押し
込み部を形成したのち、分塊圧延ロールの平パスと縦パ
スによって厚み方向と幅方向に圧下を加えるもので、と
くに端部における押し込みによって端部の側部未圧延部
に対する幅割合を大きくすることによって、圧延材先端
クロップの中央凸部とオーバーラップ状の形成が小さく
なり、且つ幅寸法の不足が改善されて歩留りを向上する
と共に、この押圧部の形成が圧延工程中に行われ、鍛造
を必要としないため、スラブ製造の効率が上がるという
利点がある。[0005] This method involves biting both ends of the ingot at an early stage in the rolling schedule, forming a push-in part by biting back, and then rolling the ingot in the thickness direction and width direction by flat passes and longitudinal passes of the blooming roll. In particular, by pushing in the end portion and increasing the width ratio of the end portion to the side unrolled portion, the overlap shape with the central convex portion of the tip crop of the rolled material is reduced, and the width is increased. This has the advantage of improving the yield by improving dimensional deficiencies, and increasing the efficiency of slab manufacturing because the pressing portion is formed during the rolling process and does not require forging.
【0006】[0006]
【発明が解決しようとする課題】ところが、チタン丸柱
鋳塊の分塊圧延ロールによる圧延に際しての押し込み部
の形成は、ロール回転を伴う噛み込み、噛み戻し圧延に
よって行われ、丸鋳塊特有の現象として、中央直径部の
メタルボリュームのフローは端部、すなわち、長さ方向
への移動が行われる。このため、両端部の幅拡がり代は
小さく、且つオーバーラップの抑制効果も小さいという
欠点がある。[Problem to be Solved by the Invention] However, when rolling a titanium round column ingot with a blooming roll, the formation of the indented part is performed by biting and biting back rolling accompanied by roll rotation, and this phenomenon is unique to round ingots. As the flow of the metal volume in the central diameter section takes place at the ends, i.e. in the longitudinal direction. Therefore, there is a drawback that the width expansion margin at both ends is small, and the effect of suppressing overlap is also small.
【0007】本発明において解決する課題は、チタン丸
鋳塊を分塊圧延によってスラブを製造する方法における
押し込み部の形成に伴う欠点を解消することにあり、効
率良くクロップのオーバーラップ抑制と幅寸法不足を解
消して歩留りを向上せしめるための手段を提供するもの
である。The problem to be solved by the present invention is to eliminate the drawbacks associated with the formation of push-in portions in the method of manufacturing slabs from titanium round ingots by blooming rolling, and to efficiently suppress crop overlap and improve width dimensions. This provides a means to eliminate the shortage and improve yield.
【0008】[0008]
【課題を解決するための手段】本発明によるチタンスラ
ブの製造方法は、■ チタン丸柱鋳塊の分塊圧延初期
に、得ようとする所定スラブ幅よりも小さい幅となる幅
圧延を施し、スラブの側面となる鋳塊の両端部にオーバ
ーラップを形成させ、■ 次に、鋳塊をその長手方向
に90°転回して、ロールの圧下による押し込み部を形
成し、■ そして、同押し込み部までの厚みおよび所
定の最終スラブ厚みまで圧延を行うことによって、その
課題を解決した。[Means for Solving the Problems] The method for manufacturing a titanium slab according to the present invention is as follows: (1) At the initial stage of blooming rolling of a titanium round column ingot, width rolling is performed to obtain a width smaller than a predetermined slab width to be obtained; An overlap is formed at both ends of the ingot, which will be the side surfaces of the ingot, ■ Next, the ingot is turned 90 degrees in the longitudinal direction to form a push-in part by rolling down the rolls, ■ Then, up to the push-in part The problem was solved by rolling the slab to a certain thickness and a predetermined final slab thickness.
【0009】上記、オーバーラップを形成するための圧
延は、所定スラブ幅のマイナス6〜12%に幅圧延を施
すことが、最終スラブ幅出し量の確保とスラブ両端部の
幅不足部減少の点から望ましい。[0009] In the above-mentioned rolling for forming the overlap, width rolling is performed to minus 6 to 12% of the predetermined slab width in order to secure the final slab width and reduce the insufficient width at both ends of the slab. desirable.
【0010】さらに、前記押し込み部までの厚みおよび
所定の最終スラブ厚みまでの圧延は、鋳塊の径がスラブ
幅より大きい場合の圧延において充分な幅出し量を確保
し、初期目的のスラブ幅の製造、引抜きエッジング量の
確保によるスラブ両端部の幅不足を減少させる点から、
ロール周速≦30m/min、1パス当たりのロール圧
下量を≧200mmの条件で行うことが望ましい。Furthermore, the rolling to the thickness up to the push-in part and the predetermined final slab thickness ensures a sufficient amount of tentering in rolling when the diameter of the ingot is larger than the slab width, and achieves the initial target slab width. From the viewpoint of reducing the lack of width at both ends of the slab by securing the amount of manufacturing and drawing edging,
It is desirable to carry out the process under the conditions that the peripheral speed of the roll is 30 m/min and the amount of roll reduction per pass is 200 mm or more.
【0011】[0011]
【作用】ロールプレスによる押し込み部の形成によって
ロール噛み込みの場合よりも、端部へのメタルフローが
小となり、後続の圧延工程において、圧延によるメタル
フローは直接端部に向かうのでなく、押し込み部に向か
うのでクロップの発生がより少なくなる。[Effect] By forming the push-in part by the roll press, the metal flow toward the end becomes smaller than in the case of roll biting, and in the subsequent rolling process, the metal flow due to rolling does not go directly to the end, but instead flows into the push-in part. , so there will be less cropping.
【0012】また、このロールプレス圧下により、端部
の幅がロール噛み込みよりも幅方向へのメタルフローが
大となって広がるので、幅が不足しがちな端部において
充分な幅が確保される。[0012] Also, due to this roll press reduction, the width of the end part is expanded by the metal flow in the width direction being larger than the roll biting, so that a sufficient width is secured at the end part where width tends to be insufficient. Ru.
【0013】さらに、オーバーラップの張出し部が端部
の幅出し部とエッジングパスにおいて、引抜き圧延をす
ることによるクロップ肩部の押し上げにつながり、幅整
形と相まってクロップ量を低減することができる。Further, the overhanging portion of the overlap leads to the pushing up of the crop shoulder by drawing and rolling at the end width portion and the edging pass, and in combination with width shaping, it is possible to reduce the amount of cropping.
【0014】これによって、オーバーラップによる側面
へのメカニカルパイプの入り込みおよび側面からのメタ
ル張り出し不足によるスラブ端部の肩肉不足と、オーバ
ーラップの発生という丸鋳塊からスラブを製造する時の
二大欠点が解消できる。[0014] This solves two problems when manufacturing slabs from round ingots: insufficient shoulder thickness at the end of the slab due to mechanical pipes entering the sides due to overlap and insufficient metal overhanging from the sides, and occurrence of overlaps. Defects can be resolved.
【0015】[0015]
【実施例】本発明に基づいて、715mmφ〜1230
mmφまでのチタン丸柱鋳塊から所定の幅を有するスラ
ブを製造した。[Example] Based on the present invention, 715 mmφ to 1230
A slab having a predetermined width was manufactured from a titanium round column ingot up to mmφ.
【0016】図1〜図5はその処理工程を示す。FIGS. 1 to 5 show the processing steps.
【0017】まず、図1に示すように、鋳塊1の上面部
を所定のスラブ幅よりも6〜12%小さい幅となるよう
に分塊圧延ロール2,3によって圧延し、両端部の圧延
面にオーバーラップ部a、aを形成した。First, as shown in FIG. 1, the upper surface of the ingot 1 is rolled by blooming rolls 2 and 3 so that the width is 6 to 12% smaller than a predetermined slab width, and the rolling of both ends is performed. Overlapping parts a and a were formed on the surface.
【0018】次に図2に示すように、第1の工程で得た
オーバーラップ部a、aが側面に来るように圧延鋳塊1
をその長さ方向軸を中心にして90°回転させたのち、
図3に示すように、鋳塊1の両端部の300mm以内を
分塊圧延ロール2,3によって上下から圧下プレスし、
300〜500mmの深さにプレスを行い、先端部上下
面に押し込み部b、bを形成すると同時に、側部にメタ
ル張り出し部c、cも形成した。Next, as shown in FIG. 2, the rolled ingot 1 is placed so that the overlap parts a, a obtained in the first step are on the side surfaces.
After rotating 90° around its longitudinal axis,
As shown in FIG. 3, within 300 mm of both ends of the ingot 1 are pressed down from above and below by blooming rolls 2 and 3,
Pressing was performed to a depth of 300 to 500 mm to form push-in portions b, b on the top and bottom surfaces of the tip, and at the same time, metal protruding portions c, c were also formed on the sides.
【0019】そして、図4に示すように、分塊圧延ロー
ル2,3で通常のダブル片パスを施し、その端部押し込
み部b、bの深さまで圧延を行った。Then, as shown in FIG. 4, a normal double pass was applied with blooming rolls 2 and 3, and rolling was carried out to the depth of the pushed end portions b and b.
【0020】さらに、約250〜350mmの厚みにな
ったスラブ材に図5に示すように、圧延ロール2、3の
カリバー領域4を使用して長手中央部より両端部へ引抜
き圧延を行った。Furthermore, as shown in FIG. 5, the slab material having a thickness of about 250 to 350 mm was drawn and rolled from the longitudinal center to both ends using the caliber regions 4 of the rolling rolls 2 and 3.
【0021】上記図3に示すロール圧下でのプレスによ
る押し込み部c,cの形成によってロール噛み込みの場
合よりも、端部へのメタルフローが小となり、後続の圧
延工程において、圧延によるメタルフローは直接端部に
向かうのでなく、押し込み部に向かうのでクロップの発
生がより少なくなる。また、このロールプレス圧下によ
り、端部の幅がロール噛み込みよりも幅方向へのメタル
フローが大となって広がるので、幅が不足しがちな端部
において充分な幅が確保される。[0021] Due to the formation of the pressed-in portions c and c by pressing under roll rolling as shown in Fig. 3, the metal flow toward the end is smaller than in the case of roll biting, and in the subsequent rolling process, the metal flow due to rolling is reduced. Since it does not go directly to the end but to the push-in part, cropping is less likely to occur. Further, due to this roll press reduction, the width of the end portion is expanded by a larger metal flow in the width direction than the roll bite, so that a sufficient width is ensured at the end portion where width tends to be insufficient.
【0022】そして、図1と図2に示すオーバーラップ
部a、aの張出し部が端部の幅出し部とエッジングパス
において、引抜き圧延をすることによるクロップ肩部の
押し上げにつながり、幅整形と相まって2%のクロップ
量に抑制することができた。[0022] Then, the overhanging parts of the overlap parts a and a shown in Figs. 1 and 2 lead to the pushing up of the crop shoulder by drawing and rolling at the end width part and the edging pass, resulting in width shaping and Combined, we were able to suppress the crop amount to 2%.
【0023】上記実施例においては、従来の圧延最終工
程の方法によるクロップロス量が2〜4%であったのに
対し、2.0〜2.5%へ低下した。In the above example, the crop loss amount was reduced to 2.0 to 2.5%, whereas it was 2 to 4% in the conventional final rolling process.
【0024】[0024]
【発明の効果】本発明によって以下の効果を奏すること
ができる。[Effects of the Invention] The following effects can be achieved by the present invention.
【0025】(1)チタン丸鋳塊を分塊圧延するに際し
、圧延初期に鋳塊がスラブ側面となる端部に故意にオー
バーラップを形成させスラブ先端の肩を張り出すため、
幅寸法不足が大幅に改善される。(1) When blooming a titanium round ingot, an overlap is intentionally formed at the end of the ingot that becomes the side surface of the slab at the beginning of rolling, so that the shoulder at the tip of the slab is extended.
The lack of width dimension is greatly improved.
【0026】(2)端部をプレスしているので、圧延に
よるメタルフローが鋳塊の端部に流れ難くなる。したが
って圧延の際に生じるクロップの量が減少し歩留りが向
上する。(2) Since the ends are pressed, metal flow due to rolling becomes difficult to flow to the ends of the ingot. Therefore, the amount of crop produced during rolling is reduced and the yield is improved.
【0027】(3)端部のプレス成形と圧延が同一圧延
機で行われるため、設備費が安価であり、従って、コス
トが安価に製造できる。(3) Since press forming and rolling of the end portions are performed in the same rolling mill, equipment costs are low, and therefore manufacturing can be done at low cost.
【図1】 チタン円柱鋳塊の両端部にオーバーラップ
を形成する工程を鋳塊の側面から見た図によって示す。FIG. 1 shows a process of forming overlaps at both ends of a cylindrical titanium ingot, as seen from the side of the ingot.
【図2】 押し込み部の形成のために圧延鋳塊を90
°回転した状態を平面から見た図である。[Figure 2] Rolled ingot is rolled at 90mm to form the indented part.
It is a plan view of the rotated state.
【図3】 押し込み部の形成工程を平面から見た図で
ある。FIG. 3 is a plan view of the step of forming the push-in portion.
【図4】 押し込み部形成後の圧延状態を示す。FIG. 4 shows the rolling state after the indentation part is formed.
【図5】 最終工程としての引抜き圧延状態を示す。FIG. 5 shows the state of drawing and rolling as the final process.
1 チタン丸柱鋳塊 2,3 分塊圧延ロール 4 カリバー領域 1 Titanium round column ingot 2, 3 Blooming roll 4 Calibur area
Claims (1)
らのチタンスラブの製造方法において、分塊圧延初期に
、得ようとする所定スラブ幅よりも小さい幅となる幅圧
延を施してスラブの側面となる鋳塊の両端部にオーバー
ラップを形成し、次に、鋳塊をその長手方向に90°転
回して、ロールの圧下による押し込み部を形成し、そし
て、同押し込み部までの厚みおよび所定の最終スラブ厚
みまで強圧延を行い、さらに、側面を中央部から端部へ
引抜き圧延を行うチタンスラブの製造方法。Claim 1: In a method for producing a titanium slab from a titanium round ingot using a blooming roll, width rolling is performed to obtain a width smaller than a predetermined slab width to be obtained at the initial stage of blooming rolling, and the side surface of the slab is An overlap is formed at both ends of the ingot, and then the ingot is turned 90 degrees in the longitudinal direction to form a pushed-in part by rolling down the rolls, and the thickness and predetermined thickness up to the pushed-in part are A method for manufacturing titanium slabs, which involves intense rolling to a final slab thickness of , and then drawing-rolling the sides from the center to the ends.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12999291A JPH04356301A (en) | 1991-05-31 | 1991-05-31 | Manufacture of titanic slab |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12999291A JPH04356301A (en) | 1991-05-31 | 1991-05-31 | Manufacture of titanic slab |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04356301A true JPH04356301A (en) | 1992-12-10 |
Family
ID=15023478
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12999291A Withdrawn JPH04356301A (en) | 1991-05-31 | 1991-05-31 | Manufacture of titanic slab |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04356301A (en) |
-
1991
- 1991-05-31 JP JP12999291A patent/JPH04356301A/en not_active Withdrawn
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980806 |