JPS62192521A - Hearth roller - Google Patents

Hearth roller

Info

Publication number
JPS62192521A
JPS62192521A JP3578986A JP3578986A JPS62192521A JP S62192521 A JPS62192521 A JP S62192521A JP 3578986 A JP3578986 A JP 3578986A JP 3578986 A JP3578986 A JP 3578986A JP S62192521 A JPS62192521 A JP S62192521A
Authority
JP
Japan
Prior art keywords
roller
hearth
sleeve
core material
hearth roller
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
Application number
JP3578986A
Other languages
Japanese (ja)
Inventor
Sadayuki Wachi
和智 貞行
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP3578986A priority Critical patent/JPS62192521A/en
Publication of JPS62192521A publication Critical patent/JPS62192521A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To improve the durability of a hearth roller and to prevent the sticking of oxide by cooling a ceramic layer on the surface of the roller through a heat insulating layer so as to keep the surface of the roller at a temp. close to the temp. of a furnace without causing supercooling. CONSTITUTION:A hearth roller is composed of a roller core material 1 and a sleeve 3. The core material 1 has a cooling water path 2 along the axis in the longitudinal direction. A ceramic layer 4 of 40-800mum thickness is formed on the outside of the sleeve 3 by spray coating and a heat insulating layer 5 having 2-4kcal/m.H. deg.C coefft. of heat insulation is formed between the core material 1 and the sleeve 3.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、ローラハース式連続熱処理炉、特許こ直火
式バーナ炉における耐久性にすぐれたハースローラに関
する。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a hearth roller with excellent durability in a roller hearth type continuous heat treatment furnace, a patented direct-fired burner furnace.

従来技術とその問題点 ローラハース式連続熱処理炉、特に直火式バーナ炉のハ
ースローラには、酸化物の付着に起因する被加熱材料の
表面傷、°いわゆるピックアップの防止効果が要求され
る。
Prior art and its problems Roller hearth type continuous heat treatment furnaces, especially hearth rollers of direct-fired burner furnaces, are required to have the effect of preventing so-called pickup, which is the surface scratches on the heated material caused by the adhesion of oxides.

従来、ハースローラζζはセラミックスコーティングが
なされ、酸化物の付着防止が図られていた。
Conventionally, hearth rollers ζζ have been coated with ceramics to prevent the adhesion of oxides.

しかし、セラミックスコーティングされたハースローラ
の耐熱温度は約900℃であり、一方前記炉は900〜
1400℃の高温度で操業されるため、該ハースローラ
の寿命は値か1〜2か月と短く、耐久性に欠ける問題が
あった。
However, the heat-resistant temperature of the ceramic-coated hearth roller is about 900°C, while the temperature of the furnace is about 900°C.
Since the hearth roller is operated at a high temperature of 1,400° C., the lifespan of the hearth roller is as short as 1 to 2 months, resulting in a lack of durability.

そこで、ハースローラの内部を水冷して表面温度を低下
し、耐久性゛の向上と共に酸化物の付着防止を図ったハ
ースローラも提案されているが、該ハースローラにあっ
ては、過冷却による炉熱損失が大きく、炉効率を低下さ
せる問題があった。
Therefore, a hearth roller has been proposed in which the inside of the hearth roller is water-cooled to lower the surface temperature, thereby improving durability and preventing oxide adhesion. There was a problem in that the furnace efficiency was reduced.

又、前記ハースローラに代え、ハースローラを内湾と外
筒で構成し、その間に断熱層を形成して水冷するハース
ローラが提案されているが(特開昭58−81915号
)、該ハースローラも表面温度が400〜600℃と炉
温度基こ比べて低く、前記同様炉効率を低下させる問題
があった。
Furthermore, instead of the hearth roller, a hearth roller has been proposed in which the hearth roller is composed of an inner bay and an outer cylinder, a heat insulating layer is formed between them, and the water is cooled (Japanese Patent Application Laid-Open No. 81915/1989). The furnace temperature was 400 to 600°C, which was lower than that of the previous furnace, and there was a problem of lowering the furnace efficiency as described above.

問題を解決するための手段・ この発明のハースローラは、ローラ芯材とスリーブとで
構成され、ローラ芯材には軸心の長手方向に冷却水通路
を形成してなるハースローラにおいて、前記スリーブの
外周面に溶射コーティングにより厚さ40〜800μm
のセラミックス層を形成すると共に、ローラ芯材とスリ
ーブとの間に断熱係数2.0〜4.0 kcal/m、
H0’Cの断熱層を形成したハースローラを要旨とする
Means for Solving the Problem - The hearth roller of the present invention is composed of a roller core material and a sleeve, and a cooling water passage is formed in the roller core material in the longitudinal direction of the axis. Thickness 40-800μm by thermal spray coating on the surface
A ceramic layer of 2.0 to 4.0 kcal/m is formed between the roller core material and the sleeve.
The gist is a hearth roller with a H0'C heat insulating layer formed thereon.

すなわち、ハースローラのセラミックス層を所定の断熱
係数を有する断熱層を介して冷却することにより、セラ
ミックス層の表層温度を附ピックアップ性を有する温度
以下に保持し、ハースローラの耐久性の向上と共に酸化
物の付着防止を図り、かつ炉効率の低下を抑制するもの
である。
In other words, by cooling the ceramic layer of the hearth roller through a heat insulating layer having a predetermined heat insulation coefficient, the surface temperature of the ceramic layer is maintained at a temperature below which has the pick-up property, and the durability of the hearth roller is improved and oxides are removed. This is intended to prevent adhesion and suppress a decrease in furnace efficiency.

以下、この発明を図面に基づいて説明する。The present invention will be explained below based on the drawings.

第1図はこの発明に係るハースローラを示す中間部分の
長さを省略した半裁断面図である。
FIG. 1 is a half-cut sectional view showing a hearth roller according to the present invention, with the length of the intermediate portion omitted.

この発明は、ローラ芯材(1)とスリーブ(3)とで構
成され、ローラ芯材(1)には軸心の長手方向に冷却水
を循環する通路(2)を形成してなるハースローラにお
いて、前記スリーブ(3)の外周面に溶射コーティング
等によりセラミックス、’i!(4)を形成すると共に
、ローラ芯材(1)とスリーブ(3)との間に断熱N(
5)を形成したものである。
The present invention provides a hearth roller comprising a roller core material (1) and a sleeve (3), the roller core material (1) having a passageway (2) for circulating cooling water in the longitudinal direction of the shaft center. , ceramics is coated on the outer peripheral surface of the sleeve (3) by thermal spray coating, 'i! (4), and also forms heat insulation N(
5).

さらに、この発明は前記セラミックス層(4)の厚さを
40〜800μmに、断熱層(5)の断熱係数を2.0
〜4.0 kca 117m、 H,’Cに限定するも
のである。
Further, in this invention, the thickness of the ceramic layer (4) is set to 40 to 800 μm, and the heat insulation coefficient of the heat insulation layer (5) is set to 2.0.
~4.0 kca 117m, H, 'C.

セラミックス層の厚さを40〜800μmとしたのは、
40μm以下であるとセラミックス層が薄くなりすぎて
摩耗による耐久性の低下が生じ、実用化に適しない。又
、800μm以上であるとセラミックス層がひび割れ等
により剥離が生じ、同様に耐久性が低下する。
The thickness of the ceramic layer was set to 40 to 800 μm because
If the thickness is 40 μm or less, the ceramic layer becomes too thin and durability deteriorates due to wear, making it unsuitable for practical use. Moreover, if it is 800 μm or more, the ceramic layer will peel off due to cracks, etc., and the durability will similarly decrease.

又、セラミックス層の組成としてはZrO2+ c。Furthermore, the composition of the ceramic layer is ZrO2+c.

−Cr等を主成分とするものを用いることができ、コー
ティングに際してはデトネーション又はプラズマ、酸素
−アセチレン等の溶射手段を用いることができる。
-Cr or the like as a main component can be used, and for coating, detonation, plasma, oxygen-acetylene, or other thermal spraying means can be used.

断熱係数を2.0〜4.0 k ca (1/m、 H
,’Cとしたのは、4、Okca e/m、H,’C以
上であると炉熱損失が大きくなりセラミックスコーティ
ングした効果が低下し、2、Okca 6/m、 H,
’C以下であるとハースローラの表面温度が高くなりセ
ラミックス層の耐久性が低下するからである。
The insulation coefficient is set to 2.0 to 4.0 kca (1/m, H
, 'C was selected because if it is 4, Okca e/m, H, 'C or more, the furnace heat loss will increase and the effect of ceramic coating will decrease, and 2, Okca 6/m, H,
This is because if the temperature is less than 'C, the surface temperature of the hearth roller increases and the durability of the ceramic layer decreases.

又、断熱層の材料としては、金網を巻いたもの。In addition, the material for the insulation layer is wire mesh wrapped around it.

ワイヤー、石綿等を用いることができる。Wire, asbestos, etc. can be used.

これにより、この発明のハースローラは、表面温度を炉
温、すなわち900℃に近く保持し、ハースローラの耐
久性の向上と共に酸化物の付着防止を図り、かつ炉効率
の低下を抑制するものである。
As a result, the hearth roller of the present invention maintains the surface temperature close to the furnace temperature, that is, 900° C., improves the durability of the hearth roller, prevents the adhesion of oxides, and suppresses a decrease in furnace efficiency.

実   施   例 以下、この発明の実施例について説明する。Example Examples of the present invention will be described below.

ローラ芯材とスリーブとで構成される 外   径:120fiφ 材  質: MORE −n (太平金属製N1−c、
−w耐熱合金) のハースローラのスリーブ外周面に 手  段:プラズマ溶射 により、 主成分: ZrO2、不安定Y 厚   さ : 400μm のセラミックス層を形成すると共に、ローラ芯材とスリ
ーブとの間に 断熱係数: 3.5 kcal/m、H,’C材  料
二線径QJ31+1.線間距g!2!rIIの5US3
10の金網を厚さ5111に数四巻 いたもの で断熱層を形成したこの発明のハースローラと、同上の
セラミックス層を形成した従来のハースローラを、 炉型式:il!l大火−ナ炉 炉温度: 1200℃ 雰囲気:O,−1〜2% ローラ数:8本 の熱処理炉において 期  間:1か月連続使用 して、附へ性、ピックアップ、炉熱損失について比較し
た。
Composed of roller core material and sleeve Outer diameter: 120fiφ Material: MORE-n (Taihei Metal N1-c,
A ceramic layer with main components: ZrO2, unstable Y, thickness: 400 μm is formed on the outer circumferential surface of the sleeve of the hearth roller (heat-resistant alloy) by means of plasma spraying. : 3.5 kcal/m, H, 'C material double wire diameter QJ31+1. Line distance g! 2! rII 5US3
The hearth roller of this invention, in which a heat insulating layer is formed by winding several wire meshes with a thickness of 5111 mm, and the conventional hearth roller, in which the same ceramic layer as described above is formed, are combined into a furnace type: il! Furnace Temperature: 1200°C Atmosphere: O, -1~2% Number of rollers: 8 in a heat treatment furnace Duration: 1 month of continuous use and comparison of adhesion, pick-up, and furnace heat loss did.

その結果を第1表に示す。The results are shown in Table 1.

又、比較時におけるこの発明のハースローラ各部位の温
度分布を第2図に示す。
FIG. 2 shows the temperature distribution at each part of the hearth roller of the present invention during comparison.

第   1   表 以上の実施例からも明らかなように、この発明のバース
ローラバ、従来のハースローラに比べ、1m久性、1酎
ピツクアツプ性、熱効率の点においてすぐれていること
がわかる。
As is clear from the examples shown in Table 1, the bath roller rubber of the present invention is superior to the conventional hearth roller in terms of 1-meter durability, 1-piece pick-up performance, and thermal efficiency.

発  明  の  効  果 この発明のハースローラは、前記したように、断熱層を
介してローラ表面のセラミックス層を冷却するようにし
たものであるから、a−ラ表面が過冷却となることなく
炉温に近く保持され、これにより耐久性の向上と共に酸
化物の付着防止が図れ、かつ炉効率の低下が抑制できる
ものである。
Effects of the Invention As described above, in the hearth roller of the present invention, since the ceramic layer on the roller surface is cooled through the heat insulating layer, the furnace temperature can be maintained without overcooling the a-ra surface. This improves durability, prevents oxide adhesion, and suppresses a decrease in furnace efficiency.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明に係ろハースローラを示す中間部分の
長さを省略した半裁断面図、第2図は実施例比較時にお
けるこの発明のハースローラ各部位の温度分布を示すグ
ラフである。 1・・・ローラ芯材、2・・・冷却水通路、3・・・ス
リーブ、4・・・セラミックス層、5・・・断熱層。
FIG. 1 is a half-cut cross-sectional view of a hearth roller according to the present invention, with the length of the intermediate portion omitted, and FIG. 2 is a graph showing the temperature distribution of various parts of the hearth roller of the present invention when comparing examples. DESCRIPTION OF SYMBOLS 1... Roller core material, 2... Cooling water passage, 3... Sleeve, 4... Ceramic layer, 5... Heat insulation layer.

Claims (1)

【特許請求の範囲】[Claims] ローラ芯材とスリーブとで構成され、ローラ芯材には軸
心の長手方向に冷却水通路を形成してなるハースローラ
において、前記スリーブの外周面に溶射コーティングに
より厚さ40〜800μmのセラミックス層を形成する
と共に、ローラ芯材とスリーブとの間に断熱係数2.0
〜4.0kcal/m.H.℃の断熱層を形成したこと
を特徴とするハースローラ。
In a hearth roller composed of a roller core material and a sleeve, in which a cooling water passage is formed in the longitudinal direction of the shaft center, a ceramic layer with a thickness of 40 to 800 μm is applied to the outer peripheral surface of the sleeve by thermal spray coating. At the same time, there is a thermal insulation coefficient of 2.0 between the roller core material and the sleeve.
~4.0kcal/m. H. A hearth roller characterized by forming a heat insulating layer at ℃.
JP3578986A 1986-02-19 1986-02-19 Hearth roller Pending JPS62192521A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3578986A JPS62192521A (en) 1986-02-19 1986-02-19 Hearth roller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3578986A JPS62192521A (en) 1986-02-19 1986-02-19 Hearth roller

Publications (1)

Publication Number Publication Date
JPS62192521A true JPS62192521A (en) 1987-08-24

Family

ID=12451678

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3578986A Pending JPS62192521A (en) 1986-02-19 1986-02-19 Hearth roller

Country Status (1)

Country Link
JP (1) JPS62192521A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01147017A (en) * 1987-12-01 1989-06-08 Kubota Ltd Hearth roll for silicon steel sheet heat-treating furnace
CN102649991A (en) * 2011-02-25 2012-08-29 上海宝钢设备检修有限公司 High-temperature-resistant water-cooling furnace bottom roll
JP2015127617A (en) * 2013-12-27 2015-07-09 株式会社ノリタケカンパニーリミテド Heating furnace transport member
CN111663030A (en) * 2020-06-17 2020-09-15 浦项(张家港)不锈钢股份有限公司 Method for preventing foreign matter from adhering to roller surface of hearth roller and device for preventing iron scale from adhering

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01147017A (en) * 1987-12-01 1989-06-08 Kubota Ltd Hearth roll for silicon steel sheet heat-treating furnace
CN102649991A (en) * 2011-02-25 2012-08-29 上海宝钢设备检修有限公司 High-temperature-resistant water-cooling furnace bottom roll
JP2015127617A (en) * 2013-12-27 2015-07-09 株式会社ノリタケカンパニーリミテド Heating furnace transport member
CN111663030A (en) * 2020-06-17 2020-09-15 浦项(张家港)不锈钢股份有限公司 Method for preventing foreign matter from adhering to roller surface of hearth roller and device for preventing iron scale from adhering
CN111663030B (en) * 2020-06-17 2022-06-10 浦项(张家港)不锈钢股份有限公司 Method for preventing foreign matter from adhering to roller surface of hearth roller and device for preventing iron scale from adhering

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