JPS63224859A - Production of centrifugal casting combined roll - Google Patents
Production of centrifugal casting combined rollInfo
- Publication number
- JPS63224859A JPS63224859A JP6054487A JP6054487A JPS63224859A JP S63224859 A JPS63224859 A JP S63224859A JP 6054487 A JP6054487 A JP 6054487A JP 6054487 A JP6054487 A JP 6054487A JP S63224859 A JPS63224859 A JP S63224859A
- Authority
- JP
- Japan
- Prior art keywords
- outer layer
- molten metal
- layer
- flux
- inner layer
- 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
- 238000009750 centrifugal casting Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 16
- 239000002131 composite material Substances 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 abstract description 24
- 229910052751 metal Inorganic materials 0.000 abstract description 24
- 230000004907 flux Effects 0.000 abstract description 17
- 238000002844 melting Methods 0.000 abstract description 6
- 230000008018 melting Effects 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 230000003064 anti-oxidating effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- -1 5I02 Chemical compound 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は遠心鋳造複合ロールの製造方法に係り、特に内
外層の境界部が完全に溶着している製造方ン去に関する
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a centrifugally cast composite roll, and particularly to a manufacturing method in which the boundary between the inner and outer layers is completely welded.
遠心鋳造法による複合ロールの製造方法には、竪型、横
型および釘型の３つの型があるが、いずれも金型を回転
させた状態で外層溶湯を鋳込み、外層溶湯鋳込み中また
は鋳込み終了直後にフラックスを添加し、外層形成後、
内層溶湯を鋳込むととにより複合ロールを得るものであ
る。There are three types of composite roll manufacturing methods using the centrifugal casting method: vertical, horizontal, and nail-type.In all cases, the outer layer molten metal is cast while the mold is rotating, and the outer layer molten metal is cast while the outer layer molten metal is being poured or immediately after casting. After adding flux and forming the outer layer,
A composite roll is obtained by casting the inner molten metal.
この複合ロールに要求される品質上の重要ポイントは次
のとおりである。The important quality points required for this composite roll are as follows.
（イ） 均一な外層厚みを有すること。(b) Have a uniform outer layer thickness.
（ロ） 内外層境界部が完全に溶着していること。(b) The boundary between the inner and outer layers must be completely welded.
（ハ） 外層成分が過度に内層に溶は込み、内層材質を
劣化させないこと。(c) The outer layer components should not excessively melt into the inner layer and deteriorate the inner layer material.
遠心鋳造法により複合ロールを製造するには、竪型、横
型あるいは釘型の遠心鋳造機にて、まず外層を形成し、
次に第２図に示す如く金型を立てて上部より内層用溶湯
１４を勢いよく鋳込む。To manufacture a composite roll using the centrifugal casting method, the outer layer is first formed using a vertical, horizontal or nail-shaped centrifugal casting machine.
Next, as shown in FIG. 2, the mold is erected and the molten metal 14 for the inner layer is poured vigorously from the top.
すなわち、」二部２、中央部４、下部６より成る金型８
に外層１０を形成し、酸化防止用フラックス１２を散布
しこの金型８を立て上部より内層用溶局１４を注入し、
この注入流が外層１０の内表面を洗い出し、更に若干溶
解することによって内外層を溶着させる。しかし、これ
らの従来法では次の如き問題点がある。That is, a mold 8 consisting of two parts 2, a middle part 4, and a lower part 6.
An outer layer 10 is formed on the mold, an anti-oxidation flux 12 is sprinkled on the mold 8, and a flux 14 for the inner layer is injected from the top by standing up the mold 8.
This injection stream washes out the inner surface of the outer layer 10 and further melts it slightly, thereby welding the inner and outer layers. However, these conventional methods have the following problems.
（Ａ） 注入流が個流しやすく、外層厚みが不均一に
なる。(A) The injection flow tends to flow individually, resulting in non-uniform outer layer thickness.
（Ｂ） 鋳込温度、鋳込速度のばらつきにより、酸化
防止用フラックスが境界部に残存する。(B) Anti-oxidation flux remains at the boundary due to variations in casting temperature and casting speed.
（Ｃ） 外層溶は込み過多により内層材質が劣化する
。(C) The inner layer material deteriorates due to excessive melting in the outer layer.
また、外層、内層共に剥型遠心鋳造法によって鋳込む場
合を第３図（Ａ）、（Ｂ）、（Ｃ）により説明する。ま
ず、（Ａ）に示す如く金型８を回転しな力警ら鋳込み外
層１０を形成し、（Ｂ）に示す如く外層１０の内表面に
酸化防止用フラックス１２を散布し、外層１０が凝固後
、（Ｃ）の如く回転を継続しながら内層用溶湯１４を注
入し、注入完了と同時に回転を停止する。しかし、この
場合は内層用溶湯１４の注入時にフラックス１２が巻き
込まれ、このフラックス１２が内外層境界部に残存し、
内外層の健全な溶着を害する。Further, the case where both the outer layer and the inner layer are cast by peel-type centrifugal casting will be explained with reference to FIGS. 3(A), (B), and (C). First, as shown in (A), the mold 8 is rotated to form an outer layer 10 by force-casting, and as shown in (B), anti-oxidation flux 12 is sprinkled on the inner surface of the outer layer 10, and after the outer layer 10 has solidified. , (C), the inner layer molten metal 14 is injected while continuing the rotation, and the rotation is stopped at the same time as the injection is completed. However, in this case, the flux 12 is entangled when the molten metal 14 for the inner layer is poured, and this flux 12 remains at the boundary between the inner and outer layers.
This will damage the healthy welding of the inner and outer layers.
本発明の目的は、上記従来技術の問題点を解決し、一旦
形成された外層の形状を損う乙となく、かつ内外層境界
部にフラックスが残存しなし）健全な遠心鋳造複合ロー
ルの製造方法を提供するζこある。The purpose of the present invention is to solve the above-mentioned problems of the prior art, and to produce a sound centrifugally cast composite roll without damaging the shape of the outer layer once formed and with no flux remaining at the boundary between the inner and outer layers. There are several ways to do this.
〔問題点を解決するための手段および作用〕本発明の要
旨とするところは次の如くである。[Means and operations for solving the problems] The gist of the present invention is as follows.
すなわち、遠心鋳造法による圧延用複合ロールの製造方
法において、外層を遠心鋳造法にて鋳込む段階と、前記
外層が凝固後内層を上注ぎによって減圧状態で鋳込む段
階と、を有して成ることを特徴とする遠心鋳造複合ロー
ルの製造方法である。That is, the method for manufacturing a rolling composite roll by centrifugal casting includes the steps of casting an outer layer by centrifugal casting, and after the outer layer solidifies, casting the inner layer under reduced pressure by top pouring. This is a method for manufacturing a centrifugally cast composite roll.
本発明では減圧下の金型に内層用溶湯な注入することに
よって下記の脱炭反応が進行する。In the present invention, the following decarburization reaction proceeds by injecting the molten metal for the inner layer into a mold under reduced pressure.
ｃ＋ｏ＝ｃｏ（ｇ）↑
すなわち、溶湯中のＣと溶湯中の溶存酸素およびフラッ
クス成分である５Ｉ０２、ＣａＯｌＭｇＯ等の酸素とが
反応し浴中および浴面でＣＯガスを発生し激しい沸騰現
象を伴う。本発明はこの沸騰現象を発生せしめ、その流
動、攪拌効果を利用し、外層の内表面を洗い流し、外層
および内層の健全な溶着を図るのである。c+o=co(g)↑ In other words, C in the molten metal reacts with dissolved oxygen in the molten metal and oxygen such as 5I02, CaOlMgO, which is a flux component, and generates CO gas in the bath and on the bath surface, accompanied by a violent boiling phenomenon. . The present invention generates this boiling phenomenon and utilizes its flow and stirring effect to wash away the inner surface of the outer layer and achieve healthy welding of the outer and inner layers.
本発明の実施例において、内層の鋳込みに使用する装置
を第１図により説明する。第２図と重複する部分は説明
を省略するが、金型８の上部は図示の如く、遮蔽板１６
と低融点金属板１８によって真空ボックス２０を形成し
、遮蔽板１６にはフレキシブルホース２２が接続し、図
示してない真空装置にて金型８の内部を減圧できる構造
となっている。また、取鍋２４の下端の側板２６は遮蔽
板１６上端と係合し、減圧状態を維持できる。In an embodiment of the present invention, an apparatus used for casting the inner layer will be explained with reference to FIG. Although the explanation of the parts that overlap with those in FIG. 2 will be omitted, the upper part of the mold 8 has a shielding plate 16
A vacuum box 20 is formed by the low melting point metal plate 18, and a flexible hose 22 is connected to the shielding plate 16, so that the inside of the mold 8 can be depressurized by a vacuum device (not shown). Further, the side plate 26 at the lower end of the ladle 24 engages with the upper end of the shielding plate 16 to maintain a reduced pressure state.
次に、第１図の装置を使用した本発明法による遠心鋳造
複合ロールの製造を説明する。まず、公知の遠心鋳造法
により外層１０を形成し、酸化防止用フラックス１２を
外層表面に散布する。外層１０が凝固後、金型８を立て
第１図に示す如く減圧装置をセットし、真空装置を作動
して金型８の内部を１００ｍ＋ｎＨｇ柱以下に減圧する
。Next, the manufacture of a centrifugally cast composite roll by the method of the present invention using the apparatus shown in FIG. 1 will be explained. First, the outer layer 10 is formed by a known centrifugal casting method, and anti-oxidation flux 12 is sprinkled on the surface of the outer layer. After the outer layer 10 has solidified, the mold 8 is erected, a pressure reducing device is set as shown in FIG. 1, and the vacuum device is operated to reduce the pressure inside the mold 8 to below 100 m+nHg column.
次に、内層用溶湯１４を収容した取鍋２４を金型８の上
部に移動し、取鍋２４の底部の側板２６と遮蔽板１６と
を係合し、取＃ｉ２４を金型８にセットする。セット後
、取鍋２４の注入口２８より内層用溶湯１４を注入する
と、高温の溶湯１４は瞬時に低融点金属板１８を溶かし
て、減圧状態の金型８内に注入され、下部６から中央部
４、上部２を充填し凝固して内層を形成する。Next, the ladle 24 containing the molten metal 14 for the inner layer is moved to the top of the mold 8, the side plate 26 at the bottom of the ladle 24 and the shielding plate 16 are engaged, and the ladle #i24 is set in the mold 8. do. After setting, when the molten metal 14 for the inner layer is injected from the injection port 28 of the ladle 24, the high-temperature molten metal 14 instantly melts the low melting point metal plate 18 and is injected into the mold 8 under reduced pressure, starting from the lower part 6 at the center. The part 4 and the upper part 2 are filled and solidified to form an inner layer.
減圧下の金型８に注入された高温の内層用溶湯１４は外
層１０の表面の酸化防止用フラックス１２と激しく反応
する。すなわち、溶ｖＪｊ１４中の炭素とフラックス１
２中の酸素が下式の如く反応してｃ十ｏ＝ｃｏ（ｇ）↑
ＣＯガスを発生する。これにより、フラックス１２はき
れいに洗い流され、その結果、不純物の存在しない外層
内面に高温の溶湯１４が接し、溶湯１４は外層内面を若
干溶かして完全に溶着する。The high-temperature inner layer molten metal 14 injected into the mold 8 under reduced pressure reacts violently with the anti-oxidation flux 12 on the surface of the outer layer 10. That is, the carbon in the melt vJj14 and the flux 1
Oxygen in 2 reacts as shown in the formula below to generate CO gas. As a result, the flux 12 is thoroughly washed away, and as a result, the high-temperature molten metal 14 comes into contact with the inner surface of the outer layer where no impurities are present, and the molten metal 14 slightly melts the inner surface of the outer layer and is completely welded.
従って、外層１０の厚みは外層形成時とほぼ等しく均一
であり、外層１０と内層の境界部にはフラックス１２の
残留がなく完全に溶着し、かつ内層用溶湯１４は外層１
０を若干溶解したのみであるので、内層中への外層成分
の混入は僅少であって、内層の材質は劣化していない。Therefore, the thickness of the outer layer 10 is almost the same as when the outer layer was formed, and the flux 12 is completely welded to the boundary between the outer layer 10 and the inner layer, and the molten metal 14 for the inner layer is completely welded to the outer layer 10.
Since only a small amount of 0 was dissolved, there was only a small amount of the outer layer components mixed into the inner layer, and the material of the inner layer did not deteriorate.
重量７０３０ ｋｇの熱間仕上後段ロールを本発明法に
より製造した。まず、傾斜式遠心鋳造法によ６一
り外層を鋳込んだが、その条件は材質：高Ｎ１グレン鋳
鉄、湯量：３０００ｋｇ、渇渇： １３５０℃、金型回
転数：８２０ｒｐｍであった。外層鋳込後、２５分で金
型の回転を中止したが、その時の外層内表面温度は８０
０℃であった。次に金型を立て、第１図の如く鋳型上に
真空装置をセットし金型内を５０ｍｍＨｇ柱以下に減圧
した。その後、取鍋をセットし、外層鋳込み４０分後に
内層の鋳込みを開始した。内層の鋳込みは材質：ダクタ
イル鋳鉄、湯量：５５００ｋｇ、湯温：１４００℃、注
入速度：１０ｋｇ／秒、注入中の金型内の真空度：１１
００ｍｍ１（社以下等の条件であった。A hot finished back roll weighing 7030 kg was manufactured by the method of the present invention. First, the outer layer was cast using the inclined centrifugal casting method, and the conditions were as follows: material: high N1 grain cast iron, amount of hot water: 3000 kg, drying temperature: 1350°C, and mold rotation speed: 820 rpm. The rotation of the mold was stopped 25 minutes after the outer layer was cast, but the inner surface temperature of the outer layer at that time was 80.
It was 0°C. Next, the mold was erected, and a vacuum device was set on the mold as shown in FIG. 1, and the pressure inside the mold was reduced to 50 mmHg or less. Thereafter, the ladle was set, and 40 minutes after the outer layer had been cast, the inner layer was started to be cast. Inner layer casting material: ductile cast iron, amount of hot water: 5500 kg, hot water temperature: 1400°C, pouring speed: 10 kg/sec, degree of vacuum inside the mold during pouring: 11
00mm1 (the conditions were less than 0.00mm1).
製造された複合ロールは超音波探傷の結果、内外層境界
部に異状は皆無であり、健全な複合ロールであることが
確認された。As a result of ultrasonic flaw detection, the manufactured composite roll was found to have no abnormalities at the boundary between the inner and outer layers, and was confirmed to be a sound composite roll.
本発明は上記実施例からも明らかな如く、遠心鋳造法に
て外層を鋳込み、次に内層を上注ぎによって減圧状態で
鋳込むことによって次の効果を挙げることができた。As is clear from the above examples, the present invention was able to achieve the following effects by casting the outer layer by centrifugal casting and then casting the inner layer under reduced pressure by top pouring.
（イ）従来、内外層境界部の異常による折損事故が生産
量の３％程度発生していたが、本発明実施例では境界部
の組織が健全となり折損事故は皆無となった。(a) Conventionally, breakage accidents due to abnormalities at the boundary between the inner and outer layers occurred at about 3% of production, but in the embodiments of the present invention, the structure at the boundary was sound and there were no breakage accidents.
（ロ） 本発明実施例では、第１表に示す如〈従来例に
比し外層の偏肉や内層への溶は込みが減少したので外層
厚みの均一化により、外層の有効使用厚みが１０％増加
し使用寿命を延長できた。(b) In the embodiment of the present invention, as shown in Table 1, the uneven thickness of the outer layer and the penetration into the inner layer were reduced compared to the conventional example, so the thickness of the outer layer was made uniform, and the effective usable thickness of the outer layer was 10%. % increase, extending the service life.
第 １ 表Table 1
第１図は本発明実施例における内層鋳造方法を示す装置
の断面図、第２図は従来の内層の上注ぎ方法を示す装置
の断面図、第３図（Ａ）、（Ｂ）、（Ｃ）は従来の釘型
遠心鋳造方法による複合ロールの製造手順を示す断面図
である。
８・・・金型 １０ 外層第２図Fig. 1 is a sectional view of an apparatus showing an inner layer casting method in an embodiment of the present invention, Fig. 2 is a sectional view of an apparatus showing a conventional inner layer top pouring method, and Figs. 3 (A), (B), (C ) is a cross-sectional view showing the manufacturing procedure of a composite roll by a conventional nail type centrifugal casting method. 8...Mold 10 Outer layer Fig. 2
Claims (1)
おいて、外層を遠心鋳造法にて鋳込む段階と、前記外層
が凝固後内層を上注ぎによって減圧状態で鋳込む段階と
、を有して成ることを特徴とする遠心鋳造複合ロールの
製造方法。(1) A method for manufacturing a rolling composite roll by centrifugal casting, comprising the steps of casting an outer layer by centrifugal casting, and after the outer layer solidifies, casting the inner layer under reduced pressure by top pouring. A method for manufacturing a centrifugally cast composite roll, characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6054487A JPS63224859A (en) | 1987-03-16 | 1987-03-16 | Production of centrifugal casting combined roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6054487A JPS63224859A (en) | 1987-03-16 | 1987-03-16 | Production of centrifugal casting combined roll |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63224859A true JPS63224859A (en) | 1988-09-19 |
Family
ID=13145337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6054487A Pending JPS63224859A (en) | 1987-03-16 | 1987-03-16 | Production of centrifugal casting combined roll |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63224859A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012213780A (en) * | 2011-03-31 | 2012-11-08 | Kubota Corp | Composite roll for rolling, and method for manufacturing the same |
| CN103433452A (en) * | 2013-07-19 | 2013-12-11 | 高殿奎 | Degassing process for low-gas-content centrifugal composite roll |
| CN103894575A (en) * | 2012-12-27 | 2014-07-02 | 常州凯达重工科技有限公司 | Method and dedicated roller body shaping device for producing grooved cast roller through centrifugal method |
| EP3187606A1 (en) | 2014-08-25 | 2017-07-05 | Kubota Corporation | Outer layer material for composite rolls for rolling, and composite roll for rolling |
| US10947611B2 (en) | 2016-12-28 | 2021-03-16 | Kubota Corporation | Composite roll for rolling |
-
1987
- 1987-03-16 JP JP6054487A patent/JPS63224859A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012213780A (en) * | 2011-03-31 | 2012-11-08 | Kubota Corp | Composite roll for rolling, and method for manufacturing the same |
| CN103894575A (en) * | 2012-12-27 | 2014-07-02 | 常州凯达重工科技有限公司 | Method and dedicated roller body shaping device for producing grooved cast roller through centrifugal method |
| CN103433452A (en) * | 2013-07-19 | 2013-12-11 | 高殿奎 | Degassing process for low-gas-content centrifugal composite roll |
| EP3187606A1 (en) | 2014-08-25 | 2017-07-05 | Kubota Corporation | Outer layer material for composite rolls for rolling, and composite roll for rolling |
| US10376937B2 (en) | 2014-08-25 | 2019-08-13 | Kubota Corporation | Outer layer material for composite roll for rolling and composite roll for rolling |
| US10947611B2 (en) | 2016-12-28 | 2021-03-16 | Kubota Corporation | Composite roll for rolling |
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