JPH03281027A - Method for forging steel billet - Google Patents
Method for forging steel billetInfo
- Publication number
- JPH03281027A JPH03281027A JP7875690A JP7875690A JPH03281027A JP H03281027 A JPH03281027 A JP H03281027A JP 7875690 A JP7875690 A JP 7875690A JP 7875690 A JP7875690 A JP 7875690A JP H03281027 A JPH03281027 A JP H03281027A
- Authority
- JP
- Japan
- Prior art keywords
- upper anvil
- steel
- forging
- anvil
- boundary
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000005242 forging Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims description 17
- 230000007547 defect Effects 0.000 claims description 8
- 239000011800 void material Substances 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 4
- 230000002950 deficient Effects 0.000 abstract 2
- 239000002184 metal Substances 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000010008 shearing 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Forging (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、鋳片および鋼塊等の鋼片の軸芯部に残存する
ザク性空隙欠陥を圧着するために、圧延前の綱片を鍛圧
する鍛造方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to a method for compressing a steel piece before rolling, in order to compress the crack-like void defects remaining in the core of a steel piece such as a slab or a steel ingot. It relates to a forging method for forging.
従来の鋼片の鍛造方法（インラインプレス）は、第３図
に示すように、行なわれていた。すなわち、鋼片２を上
金敷４に送り、上金敷４を上下動させて、上金敷４と上
金敷６との間で鋼片２を押圧して鍛圧していた。The conventional method for forging steel billets (in-line press) is as shown in FIG. 3. That is, the steel slab 2 is sent to the upper anvil 4, the upper anvil 4 is moved up and down, and the steel slab 2 is pressed between the upper anvil 4 and the upper anvil 6 for forging.
綱片の軸芯部の空隙を圧着するためには、鍛圧によって
、軸芯部に空隙を圧着するに十分な厚み方向の圧縮応力
を付加することが必要である。In order to press the gap in the shaft core of the rope, it is necessary to apply compressive stress in the thickness direction sufficient to press the gap in the shaft core by forging.
これに封し、従来の鍛圧方法では、上金敷平坦部で押さ
れた綱片部分では、十分な圧縮応力が得られるものの、
上金敷境界部分では、鋼片の変形が表層部の剪断変形が
主体となるため、内部に十分な圧縮応力が伝播せず、そ
の結果鍛圧後の綱片内部の変形模様を示すメタルフロー
は、第４図のようになり、鍛圧時の金敷境界部に相当す
る鋼片部分では、空隙欠陥８が未圧着のまま残存してい
るという問題があった。In addition to this, in the conventional forging method, sufficient compressive stress can be obtained in the part of the rope pressed by the flat part of the upper anvil, but
At the upper anvil boundary, the deformation of the steel strip is mainly due to shear deformation in the surface layer, so sufficient compressive stress does not propagate internally, and as a result, the metal flow that shows the deformation pattern inside the steel strip after forging is As shown in FIG. 4, there was a problem in that void defects 8 remained unbonded in the steel slab portion corresponding to the anvil boundary during forging.
さらに、上記の結果を反映し、鋼片の中端部形状は、鍛
圧時の鋼片の中拡がり変形条件の違い、すなわち、上金
敷平坦部では厚み中央部の中拡がりが大きいタイコ形変
形（第４図のＡ）、上金敷境界部では表層部の［１］拡
がりが大きい台形変形（第４図のＢ）、を呈すことによ
り、長手方向に凹凸を呈するという問題があった。した
がって、この凹凸を取除くために、さらに巾方向の鍛圧
も必要となっていた。Furthermore, reflecting the above results, the shape of the middle end of the steel piece was determined by the difference in the middle expansion deformation conditions of the steel piece during forging, that is, in the flat part of the upper anvil, the middle expansion of the center part of the thickness was large (Typtic-shaped deformation). A) in FIG. 4, the upper anvil boundary has a large trapezoidal deformation (1) in the surface layer (B in FIG. 4), which causes unevenness in the longitudinal direction. Therefore, in order to remove these unevenness, further forging in the width direction was required.
本発明は上金敷境界部においても鋼片軸芯部の空隙欠陥
を圧着でき、かつ綱片山端部形状も長手方向に揃わセる
ことのできる、鋼片の鍛造方法を提供することを目的と
する。An object of the present invention is to provide a method for forging a steel billet, which is capable of crimping void defects in the shaft core of a steel billet even at the boundary between the upper anvil and making it possible to make the shape of the crest of the rope uniform in the longitudinal direction. do.
上記目的は、本発明によれば、次の鋼片の鍛造方法によ
って達成される。すなわち、
圧延前の綱片を送りつつ上金敷で鋼片を鍛圧して鋼片内
部に存在する空隙欠陥を圧着する鋼片の鍛造方法におい
て、境界部を緩やかな角度にした上金敷を用い、上金敷
の鍛圧サイクルと鋼片の送り速度との関係を、今回鍛圧
サイクルで上金敷平坦部が押圧する鋼片部分がそれより
前の鍛圧サイクルで上金敷境界部または上金敷平坦部で
少くとも１回押圧した部分となるように設定して、鍛圧
を実行することを特徴とする鋼片の鍛造方法。According to the present invention, the above object is achieved by the following method for forging a steel billet. That is, in a method for forging a steel billet, in which the steel billet is forged with an upper anvil while feeding the unrolled strip to compress the void defects existing inside the steel billet, an upper anvil with a gentle angle at the boundary is used. The relationship between the forging cycle of the upper anvil and the feed rate of the billet is such that the part of the billet pressed by the flat part of the upper anvil in the current forging cycle is at least at the boundary of the upper anvil or the flat part of the upper anvil in the previous forging cycle. A method for forging a steel billet, characterized by performing forging by setting the part so that it is pressed once.
（作用〕
上金敷境界部の形状を緩やかな角度にしたことにより上
金敷と綱片との間の摩擦係数が大きくなり、鋼片表層部
の剪断変形が無くなり、鋼片内部に大きな圧縮応力が加
えられる。これによって、上金敷境界部においても、鋼
片軸芯部の空隙欠陥を圧着でき、また、鋼片内部のメタ
ルフローが長手方向に均一になり、鋼片巾端部形状も長
手方向に揃う。(Function) By making the shape of the upper anvil boundary part a gentle angle, the coefficient of friction between the upper anvil and the rope piece increases, eliminating shear deformation on the surface layer of the steel piece, and creating a large compressive stress inside the steel piece. As a result, void defects in the core of the steel billet can be crimped even at the upper anvil boundary, the metal flow inside the billet becomes uniform in the longitudinal direction, and the shape of the width end of the billet also becomes uniform in the longitudinal direction. All together.
（実施例〕
以下に、本発明方法の望ましい実施例を、第１図、第２
図を参照して説明する。(Example) Below, preferred examples of the method of the present invention are shown in Figs. 1 and 2.
This will be explained with reference to the figures.
第１図、第２図において、ｌＯは圧延前の鋼片で、上金
敷１２に送られ、上金敷１２と上金敷１４との間で鍛圧
される。上金敷１２は繰返し上下動される。In FIGS. 1 and 2, lO is a steel billet before rolling, which is sent to the upper anvil 12 and is forged between the upper anvil 12 and the upper anvil 14. The upper anvil 12 is moved up and down repeatedly.
上金敷１２は、平坦部１２ａと、平坦部１２ａの綱片送
り方向に対向する方向の端部近傍に境界部１２ｂとを有
する。そして、上金敷１２の境界部１２ｂは水平面に対
してゆやかな角度で傾けられた傾斜面に形成されている
。The upper anvil 12 has a flat portion 12a and a boundary portion 12b near the end of the flat portion 12a in a direction opposite to the rope feeding direction. The boundary portion 12b of the upper anvil 12 is formed into an inclined surface inclined at a gentle angle with respect to the horizontal surface.
また、上金敷１２の五下動サイクルすなわち鍛圧サイク
ルと鋼片ｌＯの送り速度との関係は、第１図、第２図に
示すように、今回鍛圧サイクルで上金敷平坦部１２ａが
押圧する鋼片部分がそれより前の鍛圧サイクルで上金敷
境界部１２ｂまたは上金敷平坦部１２ａで少なくとも１
回押圧した部分となるように設定されている。すなわち
、鍛圧において、上金敷子１０部１２ａだけで、１回の
プレスだけで、気に所定の厚みに鍛圧することを避けた
方法とされている。In addition, the relationship between the five-down movement cycle of the upper anvil 12, that is, the forging cycle, and the feed rate of the billet lO is as shown in FIGS. 1 and 2. At least once at the upper anvil boundary part 12b or the upper anvil flat part 12a in the previous forging cycle.
It is set to correspond to the part pressed twice. That is, in the forging process, it is possible to avoid pressing the upper anvil 10 portion 12a to a predetermined thickness by pressing only once.
上記の方法によって鍛圧を実行した場合の作用を説明す
る。The effect when forging is performed by the above method will be explained.
上金敷１２の境界部１２ｂの形状を緩やかな角度にした
ことにより、上金敷１２、鋼片１０間の摩擦係数が大き
くなり、表層部の剪断変形が無くなり、鋼片内部に大き
な圧縮応力が加えられる。このため、上金敷境界部１２
ｂにおいても、鋼片軸芯部の空隙欠陥を圧着できる。ま
た、鋼片１０の長手方向の全部位において、はぼ同一条
件で鍛圧されるため、鋼片内部のメタルフローが長手方
向に均一となる。By making the shape of the boundary part 12b of the upper anvil 12 a gentle angle, the coefficient of friction between the upper anvil 12 and the steel slab 10 is increased, shearing deformation of the surface layer is eliminated, and large compressive stress is applied inside the steel slab. It will be done. For this reason, the upper anvil boundary 12
Also in b, the void defect in the core of the steel piece can be crimped. Further, since all parts of the steel slab 10 in the longitudinal direction are forged under substantially the same conditions, the metal flow inside the steel slab becomes uniform in the longitudinal direction.
また、鋼片ｒｉ端部形状も長手方向に揃う、そのため、
その後の圧延がしやすく、また、製品形状、寸法も良好
である。In addition, the shape of the end of the steel billet is also aligned in the longitudinal direction, so
Subsequent rolling is easy, and the product shape and dimensions are also good.
本発明によれば、
（イ）上金敷境界部においても鋼片軸芯部の空隙欠陥を
圧着できる、
（ロ）鋼片内部のメタルフローを長平方向に均一にでき
る、
（ハ）綱片山端部形状も長手方向に揃えることができる
、
等の効果が得られる。According to the present invention, (a) void defects in the shaft core of the steel piece can be crimped even at the upper anvil boundary, (b) metal flow inside the steel piece can be made uniform in the longitudinal direction, and (c) the crest of the rope piece. Effects such as the ability to align the shape of the parts in the longitudinal direction can be obtained.
第１図は本発明の鍛造方法の一例を示す綱片、金敷の断
面図、
第２図は本発明の鍛造方法のもう一つの例を示す鋼片、
金敷の断面図、
第３図は従来の鍛造方法を示す鋼片、金敷の断面図、
第４図は第３図の方法で鍛造された綱片の断面図、
である。
ＩＯ・・・・・・鋼片
１２・・・・・・上金敷
１２ａ・・・・・・平坦部
１２ｂ・・・・・・境界部
１４・・・・・・上金敷
特 許 出 願 人 ト ビーエ業株
式会社第１
図
第２図
１４下金敷FIG. 1 is a sectional view of a rope piece and anvil showing one example of the forging method of the present invention, and FIG. 2 is a steel piece showing another example of the forging method of the present invention.
Figure 3 is a cross-sectional view of a steel piece and anvil showing a conventional forging method; Figure 4 is a cross-sectional view of a piece of steel forged by the method shown in Figure 3. IO... Slab 12... Upper anvil 12a... Flat part 12b... Boundary part 14... Upper anvil patent applicant Tobee Gyo Co., Ltd. Figure 1 Figure 2 Figure 14 Lower anvil
Claims (1)
片内部に存在する空隙欠陥を圧着する鋼片の鍛造方法に
おいて、境界部を緩やかな角度にした上金敷を用い、上
金敷の鍛圧サイクルと鋼片の送り速度との関係を、今回
鍛圧サイクルで上金敷平坦部が押圧する鋼片部分がそれ
より前の鍛圧サイクルで上金敷境界部または上金敷平坦
部で少くとも１回押圧した部分となるように設定して、
鍛圧を実行することを特徴とする鋼片の鍛造方法。1. In a steel billet forging method in which the billet is forged with an upper anvil while feeding the billet before rolling, and the void defects present inside the billet are crimped, an upper anvil with a gentle angle at the boundary is used, The relationship between the forging cycle of the upper anvil and the feed rate of the billet is such that the part of the billet pressed by the flat part of the upper anvil in the current forging cycle is at least at the boundary of the upper anvil or the flat part of the upper anvil in the previous forging cycle. Set it so that it is the part you pressed once,
A method for forging a steel billet, characterized by performing forging pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7875690A JPH03281027A (en) | 1990-03-29 | 1990-03-29 | Method for forging steel billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7875690A JPH03281027A (en) | 1990-03-29 | 1990-03-29 | Method for forging steel billet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03281027A true JPH03281027A (en) | 1991-12-11 |
Family
ID=13670746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7875690A Pending JPH03281027A (en) | 1990-03-29 | 1990-03-29 | Method for forging steel billet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03281027A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016074034A (en) * | 2014-10-02 | 2016-05-12 | Ｊｆｅスチール株式会社 | Steel material forging method and steel material produced thereby |
-
1990
- 1990-03-29 JP JP7875690A patent/JPH03281027A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016074034A (en) * | 2014-10-02 | 2016-05-12 | Ｊｆｅスチール株式会社 | Steel material forging method and steel material produced thereby |
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