JPH04200964A - Method for casting complex sleeve for rolling roll - Google Patents
Method for casting complex sleeve for rolling rollInfo
- Publication number
- JPH04200964A JPH04200964A JP33891890A JP33891890A JPH04200964A JP H04200964 A JPH04200964 A JP H04200964A JP 33891890 A JP33891890 A JP 33891890A JP 33891890 A JP33891890 A JP 33891890A JP H04200964 A JPH04200964 A JP H04200964A
- Authority
- JP
- Japan
- Prior art keywords
- outer layer
- molten metal
- layer material
- ring
- pouring
- 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
- 238000005096 rolling process Methods 0.000 title claims abstract description 17
- 238000005266 casting Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 25
- 230000004907 flux Effects 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 230000002093 peripheral effect Effects 0.000 claims abstract description 17
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 230000003647 oxidation Effects 0.000 claims abstract description 8
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 6
- 239000010439 graphite Substances 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 239000002131 composite material Substances 0.000 claims description 20
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 8
- 238000009750 centrifugal casting Methods 0.000 claims description 5
- 238000005204 segregation Methods 0.000 abstract description 14
- 230000002159 abnormal effect Effects 0.000 abstract description 12
- 229910001141 Ductile iron Inorganic materials 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野Ｊ
本発明は、例えばＩ（形鋼圧延用ユニバーザルミルにお
ける圧延ロール用複合スリーブの鋳造方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application J] The present invention relates to a method for casting a composite sleeve for rolling rolls in, for example, a universal mill for rolling section steel.
［従来の技術１
近年、例えばＨ形鋼圧延用ユニバーサルミルにおｉＪる
圧延ロールには、外層部として、耐摩耗性、耐焼（＝ｌ
性６ご優れるタグタイル鋳鉄あるいはニノゲルグレン鋳
鉄等の鋳鉄系材料を用い、内層部として、強靭性に優れ
る球状黒鉛鋼材料を用いた複合スリーブが多用されてい
る。[Prior art 1] In recent years, for example, rolling rolls used in universal mills for rolling H-shaped steel have wear-resistant and fire-resistant (= l
Composite sleeves are often used, using cast iron-based materials such as tag tile cast iron or Ninogelgrain cast iron, which have excellent properties, and spheroidal graphite steel, which has excellent toughness, as the inner layer.
前記複合スリーブは、周知の遠心力鋳造装置により鋳造
される。The composite sleeve is cast using a well-known centrifugal casting machine.
すなわち、従来は、高速で回転する鋳型内に、前記外層
材溶湯を注入した直後に、高遠心力によって形成された
外Ｎ ＋Ａ’ ｍ ｍリングの内周面に、Ｎ２キャリヤ
ーによりアルカリ系の酸化防止用低融点フラックスを、
リング内周面ｌｎ（当り３．０ｋｇ吹込め、リング内周
面全域をシールし、前記外屓伺溶湯リングが凝固するま
で待機した後、前記内Ｎ ＋Ａ溶湯を注入し、内外両層
部を冶金的に融着させて、複合スリーブを構成していた
。That is, conventionally, immediately after pouring the molten outer layer material into a mold rotating at high speed, an alkaline oxidation preventive agent was applied to the inner peripheral surface of the outer N + A' m ring formed by high centrifugal force using an N2 carrier. Low melting point flux for
Inject 3.0 kg into the inner circumferential surface of the ring, seal the entire inner circumferential surface of the ring, wait until the outer molten metal ring solidifies, and then inject the inner N+A molten metal to seal both the inner and outer layers. They were metallurgically fused to form a composite sleeve.
［発明か解決し、Ｌうとずろ課題１
前記遠心力鋳造装置によって鋳造される複合スリーブに
おいては、内外両層９１（の境界およびその周辺の健全
性如何が、品質に大きく影蓼するが、前記境界からやや
内部に、第１図（マクロ写真）に示す如く、比較的に大
きな形状の異常組織偏析が発生ずる。[Problem 1 to be Solved by the Invention] In the composite sleeve cast by the centrifugal casting device, the quality is greatly affected by the soundness of the boundary between the inner and outer layers 91 (and the surrounding area). As shown in FIG. 1 (macro photograph), a relatively large abnormal structure segregation occurs slightly inside the boundary.
この異常組織偏析は、塊状あるいは線状を呈し、周囲と
は金属結合しているが、非金属介在物を内包することが
多く、強度劣化を招くため、多発した場合、幅落しに伴
う小止り低下や廃却を余儀なくされていた。This abnormal tissue segregation takes on the shape of a lump or a line, and although it is metallically bonded to the surrounding area, it often contains non-metallic inclusions, leading to strength deterioration. It was forced to degrade or be discarded.
また前記異常組織偏析は、超音波探傷等の非破壊検査に
よる検出が困難なため、圧延中δこおけるトラブル発生
も懸念されていた。Furthermore, since the abnormal tissue segregation is difficult to detect by non-destructive testing such as ultrasonic flaw detection, there has been concern that trouble may occur due to δ cracking during rolling.
］１１工記異常組織偏析の発生メカニズムについて説明
すると、前記フラックスの添加後、内層材溶湯が注入さ
れるまでに１００分以上の待機時間があるため、この間
に、フラックス組成中のＮａ、＋３等の低融点酸化物か
朶発し、ｌ容部温度や粘＋１Ｆが−１−昇−二するとＪ
（に、絶対量も減少し、外層月溶出リングの内周面にフ
ラックスが被覆されない領域が形成される。]11 To explain the mechanism of occurrence of abnormal structure segregation, there is a waiting time of 100 minutes or more after the addition of the flux before the inner layer material molten metal is injected, so during this time Na, +3, etc. in the flux composition When the low melting point oxide of
(The absolute amount also decreases, and a region not covered with flux is formed on the inner circumferential surface of the outer elution ring.
従って、フラックス非シール部のリング内周面温度が過
度に低下し、後続の内層材溶湯が注入されたとき、適冷
されて瞬時に凝固皮膜が形成され、フラックスを包含し
たまま、遠心力によって外側へ移動し、境界近くで１−
ラップされることにより、異常組織偏析が生成されるも
のと推定され、このことは、偏析の組織が、内層材と類
似していることから立証される。Therefore, when the temperature of the inner peripheral surface of the ring in the non-sealed part of the ring drops excessively and the subsequent molten metal of the inner layer material is injected, it is cooled down and instantly forms a solidified film, and while containing the flux, the centrifugal force Move outward, 1- near the border
It is presumed that abnormal tissue segregation is generated by the wrapping, and this is evidenced by the fact that the structure of the segregation is similar to that of the inner layer material.
「課題を解決するための手段」
本発明は、前記異富組′ｉ％偏析の発生を防止し、内外
両層部性状の安定した圧延ロール用複合スリーブを鋳造
できるようにしたものであって、その要旨とするところ
は、外層部としてタグタイル鋳鉄材料あるいはニッケル
グレン鋳鉄材料を用い、内層部として球状黒鉛鋼材料を
用い、遠心力鋳造法により圧延ロール用複合スリーブを
鋳造するに当り、外Ｎ祠溶湯リング内周面の酸化防止用
低融点フラックスを、外層材溶湯の注入直後に、リング
内周面１ｍ当り３．０ｋｇ添加し、外層材溶湯の注入後
、リング内周面温度が１１００〜１０００℃になってか
らさらに前記フラックスを１ｍ当り２．０〜３．０ｋｇ
追添加し、リング内周面温度が９００〜８５０℃になっ
た時点で、内層材溶湯を注入するようにした圧延ロール
用複合スリーブの鋳造方法にある。"Means for Solving the Problems" The present invention prevents the occurrence of the above-mentioned heterotomi group'i% segregation and makes it possible to cast a composite sleeve for rolling rolls with stable properties of both the inner and outer layers. The gist of this is that when casting a composite sleeve for rolling rolls using the centrifugal casting method, the outer layer is made of tag tile cast iron or nickel grain cast iron, and the inner layer is made of spheroidal graphite steel. Immediately after pouring the molten metal for the outer layer material, add 3.0 kg of low-melting point flux per 1 m of the inner circumferential surface of the ring to prevent oxidation on the inner peripheral surface of the molten metal ring. After reaching 1000℃, add 2.0 to 3.0 kg of the above flux per 1 m.
The present invention provides a method for casting a composite sleeve for a roll, in which a molten inner layer material is injected when the ring inner peripheral surface temperature reaches 900 to 850°C.
１作用」
前記本発明方法の如く、外層材溶湯リング内周面の酸化
防止用低融点フラックスを、外５＋４熔湯の注入直後に
、リング内周面１ｍ２当り３．０ｋｇ添加し、外層＋Ａ
溶湯の注入後、リング内周面温度が１１００〜１０００
℃になってからさらに前記フラックスを１ｒ＋（当り２
．０〜３．０ｋｇ追添加することにより、フラックスの
溶融温度や粘性の上昇防止効果と、フラックスの減少量
の補給効果とが相乗して、常に外層＋Ａｉ ｔ＆リング
の内周面を、高流動のフラックスにより均一にシールし
ている状態が保持されるため、前記異常組織偏析の発生
を防止することができる。1 Effect" As in the method of the present invention, 3.0 kg of low melting point flux for preventing oxidation on the inner circumferential surface of the outer layer molten ring is added per 1 m2 of the inner circumferential surface of the ring immediately after pouring the outer 5+4 molten metal, and the outer layer +A
After pouring the molten metal, the temperature of the inner peripheral surface of the ring is 1100-1000.
℃, add the above flux to 1r+ (2
．． By adding 0 to 3.0 kg, the effect of preventing an increase in the melting temperature and viscosity of the flux and the effect of replenishing the decreased amount of flux are synergistic, and the inner peripheral surface of the outer layer + Ait & ring is constantly coated with high fluidity. Since a uniformly sealed state is maintained by the flux, occurrence of the abnormal tissue segregation can be prevented.
［実施例４
次に本発明に係る圧延ロール用複合スリーブの鋳造方法
の実施例を以下に説明する。[Example 4] Next, an example of the method for casting a composite sleeve for rolling rolls according to the present invention will be described below.
第２図は、鋳造された圧延ロール用複合スリーブ１の横
断面を示すものであって、１ａはタグタイル鋳鉄あるい
はニッケルグレン鋳鉄からなる外層部、１ｂは球状黒鉛
鋼からなる内層部であり、試験鋳造された５本の複合ス
リーブ１の外径は］、５２０ｍｍ、内１条は７９０龍、
長さは１．９００ｍである。FIG. 2 shows a cross section of a cast rolling roll composite sleeve 1, in which 1a is an outer layer made of tag tile cast iron or nickel grain cast iron, and 1b is an inner layer made of spheroidal graphite steel. The outer diameter of the five cast composite sleeves 1 is 520 mm, and the inner diameter is 790 mm.
The length is 1.900m.
しかして、下記第１表に示す化学組成のタグタイル鋳鉄
の外層シイ溶湯を、周知の遠心力鋳造装置内に注入（注
入厚２７０ ａｍ） シた直後に、外層材溶湯リング
の内周面に１ｄ当り３．０ｋｇの酸化防止用低融点フラ
ックスを添加し、外層材溶湯の注入後、リング内周面温
度が１１００〜１０００℃になってからさらに前記フラ
ックスを１ｍ当り２．０〜３．０ｋｇ追添加し、リング
内周面温度が９００〜８５０°Ｃになった時点で、第１
表に示す化学組成の球状黒鉛鋼の内層材溶湯を注入（注
入厚９５ｍｍ） して、圧延ロール用複合スリーブを
鋳造した。Immediately after pouring the outer layer molten metal of tag tile cast iron having the chemical composition shown in Table 1 below into a well-known centrifugal casting device (pouring thickness 270 am), 1 d of molten metal was poured onto the inner peripheral surface of the outer layer molten metal ring. Add 3.0 kg of low melting point flux for oxidation prevention per unit, and after pouring the molten metal for the outer layer material, add 2.0 to 3.0 kg of the above flux per 1 m when the ring inner peripheral surface temperature reaches 1100 to 1000°C. When the inner peripheral surface temperature of the ring reaches 900 to 850°C, the first
A composite sleeve for a rolling roll was cast by pouring a molten inner layer material of spherical graphite steel having the chemical composition shown in the table (pouring thickness: 95 mm).
：Ｆた第１表に示す４４１′１を用いて、従来例とし−
（の複合スリーブおよび比較例としての複合スリーブを
それぞれ鋳造した。: Using 441'1 shown in Table 1, as a conventional example -
A composite sleeve of (1) and a composite sleeve as a comparative example were cast, respectively.
１−記試験鋳造された各複合スリーブの異常組織偏析の
発生状況（全発生率）および評価を下記第２表に示ず。1-Test The occurrence status (total incidence) and evaluation of abnormal tissue segregation of each of the cast composite sleeves are shown in Table 2 below.
辺土余白
上記第２表の本発明例によれば、異常組織偏析の発生は
全く認められなかった。According to the examples of the present invention shown in Table 2 above, no abnormal tissue segregation was observed.
「発明の効果」
以」二述べた本発明方法の如く、外層材溶湯リング内周
面の酸化防止用低融点フラックスを、外層材溶湯の注入
直後に、リング内周面１ｍ２当り３．０ｋｇ添加し、外
層材溶湯の注入後、リング内周面温度が１１００〜１０
００°Ｃになってからさらに前記フラックスをｌｎ（当
り２０〜３．０ｋｇ追添加することにより、フラックス
の溶融温度や粘性の」１昇防止効果と、フラックスの減
少量の補給効果とが相乗して、常に外層材溶湯リングの
内周面を、高流動のフラックスにより均一にシールして
いる状態が保持されるため、前記異常組織偏析の発生を
防止することができる。``Effects of the Invention'' As in the method of the present invention described above, 3.0 kg of low melting point flux for preventing oxidation on the inner peripheral surface of the molten outer layer ring is added per 1 m2 of the inner peripheral surface of the ring immediately after pouring the molten outer layer material. However, after pouring the outer layer material molten metal, the temperature of the inner peripheral surface of the ring is 1100~10
By adding ln (20 to 3.0 kg per unit) of the above-mentioned flux after the temperature reaches 00°C, the effect of preventing the melting temperature and viscosity of the flux from increasing by 1 and the effect of replenishing the decreased amount of flux are synergized. Since the inner circumferential surface of the outer layer material molten metal ring is always kept uniformly sealed by the high-flow flux, the occurrence of the abnormal tissue segregation can be prevented.
第１図は従来の圧延ロール用複合スリーブに発生した異
常組織偏析を示すマクロ写真、第２図は圧延ロール用複
合スリーブの横断面図である。
１・・・圧延ロール用複合スリーブFIG. 1 is a macro photograph showing abnormal tissue segregation that occurred in a conventional composite sleeve for rolling rolls, and FIG. 2 is a cross-sectional view of the composite sleeve for rolling rolls. 1...Composite sleeve for rolling rolls
Claims (1)
ルグレン鋳鉄材料を用い、内層部として球状黒鉛鋼材料
を用い、遠心力鋳造法により圧延ロール用複合スリーブ
を鋳造するに当り、外層材溶湯リング内周面の酸化防止
用低融点フラックスを、外層材溶湯の注入直後に、リン
グ内周面１ｍ＾２当り３．０ｋｇ添加し、外層材溶湯の
注入後、リング内周面温度が１１００〜１０００℃にな
ってからさらに前記フラックスを１ｍ＾２当り２．０〜
３．０ｋｇ追添加し、リング内周面温度が９００〜８５
０℃になった時点で、内層材溶湯を注入することを特徴
とする圧延ロール用複合スリーブの鋳造方法。(1) When casting a composite sleeve for rolling rolls by centrifugal casting using tag tile cast iron material or nickel grain cast iron material for the outer layer and spheroidal graphite steel material for the inner layer, the inner peripheral surface of the outer layer material molten metal ring Immediately after pouring the molten metal for the outer layer material, add 3.0 kg of a low melting point flux for preventing oxidation per 1 m^2 of the inner peripheral surface of the ring. After that, add the above flux at 2.0 to 2.0 per m^2.
Added 3.0kg and the temperature of the inner circumferential surface of the ring increased from 900 to 85.
A method for casting a composite sleeve for a rolling roll, characterized in that a molten inner layer material is injected when the temperature reaches 0°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33891890A JPH04200964A (en) | 1990-11-30 | 1990-11-30 | Method for casting complex sleeve for rolling roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33891890A JPH04200964A (en) | 1990-11-30 | 1990-11-30 | Method for casting complex sleeve for rolling roll |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04200964A true JPH04200964A (en) | 1992-07-21 |
Family
ID=18322560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33891890A Pending JPH04200964A (en) | 1990-11-30 | 1990-11-30 | Method for casting complex sleeve for rolling roll |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04200964A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106825509A (en) * | 2016-12-30 | 2017-06-13 | 中钢集团邢台机械轧辊有限公司 | The preparation method of heavy plate mill four-roller roughing high chrome working roll binder course |
| CN115070004A (en) * | 2022-05-20 | 2022-09-20 | 中钢集团邢台机械轧辊有限公司 | Casting method of metal type centrifugal roll collar |
-
1990
- 1990-11-30 JP JP33891890A patent/JPH04200964A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106825509A (en) * | 2016-12-30 | 2017-06-13 | 中钢集团邢台机械轧辊有限公司 | The preparation method of heavy plate mill four-roller roughing high chrome working roll binder course |
| CN115070004A (en) * | 2022-05-20 | 2022-09-20 | 中钢集团邢台机械轧辊有限公司 | Casting method of metal type centrifugal roll collar |
| CN115070004B (en) * | 2022-05-20 | 2023-05-05 | 中钢集团邢台机械轧辊有限公司 | Casting method of metal centrifugal roll collar |
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