JPS63290609A - Composite sleeve for rolling roll and its manufacture - Google Patents
Composite sleeve for rolling roll and its manufactureInfo
- Publication number
- JPS63290609A JPS63290609A JP12398887A JP12398887A JPS63290609A JP S63290609 A JPS63290609 A JP S63290609A JP 12398887 A JP12398887 A JP 12398887A JP 12398887 A JP12398887 A JP 12398887A JP S63290609 A JPS63290609 A JP S63290609A
- Authority
- JP
- Japan
- Prior art keywords
- inner layer
- layer material
- outer layer
- cast iron
- molten metal
- 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.)
- Granted
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 40
- 238000005096 rolling process Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000000463 material Substances 0.000 claims abstract description 133
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 48
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 37
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 33
- 239000010439 graphite Substances 0.000 claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 239000011651 chromium Substances 0.000 claims abstract description 25
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910001141 Ductile iron Inorganic materials 0.000 claims abstract description 18
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 18
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims description 41
- 239000002184 metal Substances 0.000 claims description 41
- 238000009750 centrifugal casting Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000011109 contamination Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 17
- 230000007547 defect Effects 0.000 description 16
- 238000005266 casting Methods 0.000 description 10
- 238000007711 solidification Methods 0.000 description 10
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 230000008023 solidification Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910001567 cementite Inorganic materials 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910001037 White iron Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 238000003466 welding 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]
本発明は、熱間圧延、冷間圧送等に用いられる圧延ロー
ル用複合スリーブ及びその製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite sleeve for rolls used in hot rolling, cold rolling, etc., and a method for manufacturing the same.
[従来の技術]
近年、熱間圧延の連続化や生産性向上及び品質白玉等を
目標として圧延技術が進歩し、それに伴い圧延用ロール
も過酷な条件下で用いられることが多くなり種々の改良
がなされてきた。また、圧III品の要求品質も高級化
し、それに伴い圧延用ロールに要求される品質も厳しく
なってきている。[Conventional technology] In recent years, rolling technology has progressed with the aim of making continuous hot rolling, improving productivity, and improving the quality of rolls. Along with this, rolling rolls are often used under harsh conditions, and various improvements have been made. has been done. In addition, the quality required for rolled III products has become higher, and accordingly, the quality required for rolling rolls has also become stricter.
そこで従来、圧延用ロールの材質についての検討、圧延
用ロールの強靭化を図るための複合スリーブの採用、及
び複合スリーブの内層をさらに強靭化するための技術が
提案されている1例えば、特公昭59−11857号、
特公昭59−20417号、特公昭55−1588H号
、特公昭θ0−281810号等は、内層強靭化複合ス
リーブについての技術を提案している。これら従来の複
合スリーブにあっては、外層をダクタイル鋳鉄やニッケ
ルグレン鋳鉄もしくは高クロム鋳鉄とする時、その内層
材として、内外層境界近傍の健全性を確保するため、普
通鋳鉄やダクタイル鋳鉄等の鋳鉄系材料を用いることと
している。Therefore, conventionally, studies on the material of rolling rolls, adoption of composite sleeves to strengthen rolling rolls, and techniques for further strengthening the inner layer of composite sleeves have been proposed. No. 59-11857,
Japanese Patent Publication No. 59-20417, Japanese Patent Publication No. 55-1588H, Japanese Patent Publication No. 0-281810, etc. propose techniques for inner-layer toughened composite sleeves. In these conventional composite sleeves, when the outer layer is made of ductile cast iron, nickel grain cast iron, or high chromium cast iron, the inner layer material is made of ordinary cast iron, ductile cast iron, etc. to ensure soundness near the boundary between the inner and outer layers. Cast iron material will be used.
上記従来の圧延ロール用複合スリーブによれば、外層材
を鋳鉄系材料にて構成しているから、外層に必要とされ
る耐摩耗性や耐焼付性が確保できる。According to the above-mentioned conventional composite sleeve for rolling rolls, since the outer layer material is made of a cast iron material, the wear resistance and seizure resistance required for the outer layer can be ensured.
[発明が解決しようとする問題点]
しかしながら、上記従来の圧延ロール用複合スリーブに
あっては、外層材を鋳鉄系材料とする時、内層材も前述
の理由から鋳鉄系材料とするため、内層に高い強靭性を
確保するのに困難がある。ここで、複合スリーブは、圧
延荷重、圧延時の熱応力、スリーブ製造に伴う残留応力
が引張応力として内層に作用するため、内層材には上記
内層引張応力に耐えるだけの強靭性が必要とされる。し
たがって、従来の複合スリーブが高負荷圧延に供される
時、内層材を普通鋳鉄、ダクタイル鋳鉄等の鋳鉄系材料
で構成する場合には、内層の強靭性に不安がある。[Problems to be Solved by the Invention] However, in the above conventional composite sleeve for rolling rolls, when the outer layer material is made of cast iron material, the inner layer material is also made of cast iron material for the above-mentioned reasons. There are difficulties in ensuring high toughness. Here, in a composite sleeve, rolling load, thermal stress during rolling, and residual stress from sleeve manufacturing act on the inner layer as tensile stress, so the inner layer material needs to be strong enough to withstand the inner layer tensile stress. Ru. Therefore, when a conventional composite sleeve is subjected to high-load rolling, if the inner layer is made of a cast iron material such as ordinary cast iron or ductile cast iron, there is concern about the toughness of the inner layer.
本発明は、外層については耐摩耗性や耐焼付性に優れ、
内層については強靭性に優れた圧延ロール用複合スリー
ブを提供することを目的とする。The present invention has excellent wear resistance and seizure resistance for the outer layer,
Regarding the inner layer, the object is to provide a composite sleeve for rolling rolls with excellent toughness.
[発明が解決しようとする問題点]
本発明に係る圧延ロール用複合スリーブは、内層材と外
層材がそれぞれ異なる材料からなる圧延ロール用複合ス
リーブにおいて、上記内層材を銅系材料とし、外層材を
鋳鉄系材料とするようにしたものである。[Problems to be Solved by the Invention] The composite sleeve for rolls according to the present invention is a composite sleeve for rolls in which the inner layer material and the outer layer material are each made of different materials, wherein the inner layer material is a copper-based material, and the outer layer material is a copper-based material. is made of cast iron material.
本発明に係る圧延ロール用複合スリーブの製造方法は、
遠心鋳造にて外層溶湯鋳込後内層溶湯鋳込をする圧延ロ
ール用複合スリーブの製造方法において、上記外層溶湯
を鋳鉄系とし、該外層溶湯を鋳込して外殻層を形成した
後、上記内層溶湯を鋼系とし、該内層溶湯を鋳込む際に
上記外殻層内表面を内層溶湯により所定量溶かし、内層
中に外層材を混入させて溶着一体化せしめるようにした
ものである。The method for manufacturing a composite sleeve for rolling rolls according to the present invention includes:
In a method for manufacturing a composite sleeve for a rolling roll in which the outer layer molten metal is poured and then the inner layer molten metal is poured by centrifugal casting, the outer layer molten metal is made of cast iron, and after the outer layer molten metal is cast to form an outer shell layer, the above-mentioned molten metal is cast. The inner layer molten metal is made of steel, and when the inner layer molten metal is cast, a predetermined amount of the inner surface of the outer shell layer is melted by the inner layer molten metal, and the outer layer material is mixed into the inner layer and welded and integrated.
[作用]
本発明によれば、外層材はダクタイル鋳鉄、ニッケルグ
レン鋳鉄、高クロム鋳鉄等の鋳鉄系材ネ1にて構成され
るから、外層に必要とされる耐摩耗性や耐焼付性が確保
される。他方、内層材は球状黒鉛m等の銅系材料にて構
成されるから、内層に必要とされる強靭性が確保される
。[Function] According to the present invention, since the outer layer material is made of cast iron material 1 such as ductile cast iron, nickel grain cast iron, and high chromium cast iron, it has the wear resistance and seizure resistance required for the outer layer. Secured. On the other hand, since the inner layer material is made of a copper-based material such as spherical graphite m, the toughness required for the inner layer is ensured.
ところで、本発明の圧延ロール用複合スリーブにあって
は、外層材の例えばダクタイル鋳鉄、ニッケルグレン鋳
鉄の凝固開始温度が1200℃前後となり、もしくは高
クロム鋳鉄の凝固開始温度が1300℃前後となるのに
対し、内層材の凝固開始温度が1450℃前後になり、
両層間の凝固開始温度差が大きい上に、内層材の凝固開
始温度の方が外層材におけるよりも高くなるので、従来
の製造方法による場合には第1図に示すように内外層の
境界部に巣を生じやすいという現象が観察された。By the way, in the composite sleeve for rolling rolls of the present invention, the solidification start temperature of the outer layer material, such as ductile cast iron or nickel grain cast iron, is around 1200°C, or the solidification start temperature of high chromium cast iron is around 1300°C. On the other hand, the solidification start temperature of the inner layer material is around 1450℃,
In addition to the large solidification onset temperature difference between the two layers, the solidification onset temperature of the inner layer material is higher than that of the outer layer material, so when using the conventional manufacturing method, the boundary between the inner and outer layers as shown in Figure 1. A phenomenon in which nests were easily formed was observed.
そこで、本発明の圧延ロール用複合スリーブの製造時に
は、鋳鉄系材料が凝固して形成した外層内に銅系材料か
らなる内層溶湯を鋳込む時、外層内表面が内層溶湯にて
適正量溶解して外層材が内層中に混入せしめられるもの
とすることにより、L2内外層の境界部における中東状
欠陥の発生を防止し、内外層を溶着一体化させることと
した。Therefore, when manufacturing the composite sleeve for rolling rolls of the present invention, when the inner layer molten metal made of copper-based material is poured into the outer layer formed by solidifying the cast iron-based material, the inner surface of the outer layer is melted in an appropriate amount by the inner layer molten metal. By mixing the outer layer material into the inner layer, it was possible to prevent the occurrence of middle-east defects at the boundary between the L2 and inner and outer layers, and to integrate the inner and outer layers by welding.
すなわち、本発明によれば、外層については耐摩耗性や
耐焼付性に優れ、内層については強靭性に優れた圧延ロ
ール用複合スリーブを得ることができる。That is, according to the present invention, it is possible to obtain a composite sleeve for a rolling roll whose outer layer has excellent wear resistance and seizure resistance, and whose inner layer has excellent toughness.
[実施例]
本発明に係る圧延ロール用複合スリーブの好適例として
は、■外層材としてダクタイル鋳鉄、内層材して球状黒
鉛鋼を採用してなる複合スリーブ、■外層材としてニッ
ケルグレン鋳鉄、内層材として球状黒鉛鋼を採用してな
る複合スリーブ、■外層材として高クロム鋳鉄、内層材
として球状黒鉛鋼を採用してなる複合スリーブ等である
。[Example] Preferred examples of the composite sleeve for rolling rolls according to the present invention include: (1) a composite sleeve using ductile cast iron as the outer layer material and spheroidal graphite steel as the inner layer material; (2) a composite sleeve using nickel grain cast iron as the outer layer material and inner layer material. Composite sleeves made of spheroidal graphite steel as the material; Composite sleeves made of high chromium cast iron as the outer layer material and spheroidal graphite steel as the inner layer material.
以下、上記各材料の成分とその組成の好適範囲について
説明する。The components of each of the above materials and the preferred ranges of their compositions will be explained below.
■ダクタイル鋳鉄
C: 2.8〜3.7wt%・・・Cは2.8wt%(
以下単に%で概記する)未満では黒鉛の量が少なくなり
、ダクタイル鋳鉄ロール材質としての特徴が充分に発揮
できない、一方、3.7%を超えて含有させると脆弱と
なるため、2.8〜3.7%の範囲に規定する。■Ductile cast iron C: 2.8-3.7wt%...C is 2.8wt% (
If the content is less than 3.7%, the graphite content will be too small and the characteristics of the ductile cast iron roll material cannot be fully demonstrated.On the other hand, if the content exceeds 3.7%, it will become brittle. Specified in the range of ~3.7%.
Si:1.2〜2.6%・・・Siは1.2%未満では
黒鉛の量が少なくなり硬くて脆くなる。一方、2.6%
を超えると黒鉛量が多くなりすぎて軟らかくなり耐摩耗
性が低下するので、1.2〜2.6%の範囲に規定する
。Si: 1.2 to 2.6%...When Si is less than 1.2%, the amount of graphite decreases and the material becomes hard and brittle. On the other hand, 2.6%
If the graphite content exceeds this amount, the amount of graphite becomes too large and becomes soft, resulting in a decrease in wear resistance.
Mn:0.3〜1.0%・・・MnはSの害を抑えるの
に有効であるが0.3%未満ではその効果が充分でなく
、また1、0%を超えると、材質を脆化させるので、0
.3〜1.0%の範囲に規定する。Mn: 0.3 to 1.0%...Mn is effective in suppressing the harm caused by S, but if it is less than 0.3%, the effect is not sufficient, and if it exceeds 1.0%, it will deteriorate the material. 0 as it makes it brittle.
.. It is specified in the range of 3 to 1.0%.
P:0.1%以下・・・Pは溶湯の流動性を増加させる
が、材質を脆弱にするため、0.1%以下とする。P: 0.1% or less... P increases the fluidity of the molten metal, but it makes the material brittle, so it should be kept at 0.1% or less.
S:0.04%以下・・・Sは黒鉛の球状化を阻害する
ため低く抑える必要があり、0.04%以下とする。S: 0.04% or less... S inhibits the spheroidization of graphite, so it needs to be kept low, and is set to 0.04% or less.
Xi : 0.3〜3.0%・・・Niは黒鉛化を促進
して基地硬度を上昇させるが、0.3%未満ではその効
果が不充分であり、3.0%を超えて含有させると、残
留オーステナイトが増加して硬度が上がり難くなる。Xi: 0.3 to 3.0%...Ni promotes graphitization and increases base hardness, but if it is less than 0.3%, the effect is insufficient, and if it is contained in excess of 3.0% When this happens, retained austenite increases and hardness becomes difficult to increase.
Cr:0.8%以下・・・Orはセメンタイトの晶出を
促進する元素であり、0.8%を超えて含有させるとセ
メンタイト量が多くなり、脆くなって好ましくないので
、0.8%以下とする。Cr: 0.8% or less...Or is an element that promotes the crystallization of cementite, and if it is contained in excess of 0.8%, the amount of cementite increases and becomes brittle, which is undesirable, so 0.8% The following shall apply.
Mo:1.0%以下・・・Noは基地硬度を高める効果
を有するが、1.0%を超えると脆くなり、また不経済
でもあるので、1.0%以下とする。Mo: 1.0% or less: No has the effect of increasing base hardness, but if it exceeds 1.0%, it becomes brittle and is also uneconomical, so it is set to 1.0% or less.
Mg:0.02〜0.1%・・・Mgは黒鉛の球状化の
ために必要な元素であるが、その含有量が0.02%未
満ではその効果がなく、また0、1%を超えるとMgド
ロス等により鋳造欠陥を発生しやすくなるので、0.0
2〜0.1%の範囲に規定する。Mg: 0.02-0.1%...Mg is an element necessary for spheroidizing graphite, but if its content is less than 0.02%, it has no effect; If it exceeds 0.0, casting defects are likely to occur due to Mg dross, etc.
It is specified in the range of 2 to 0.1%.
■ニッケルグレン鋳鉄
C:2.7〜3.6%・・・Cは2.7%未満では黒鉛
の量が少なくなリニッケルグレン鋳鉄ロール材質として
の特徴が充分に発揮できない、一方、3.6%を超えて
含有させると脆弱となるため、2.7〜3.6%の範囲
に規定する。■Nickel grain cast iron C: 2.7 to 3.6%... If C is less than 2.7%, the characteristics of the nickel grain cast iron roll material, which has a small amount of graphite, cannot be fully exhibited.On the other hand, 3. If the content exceeds 6%, the content becomes brittle, so the content is specified in the range of 2.7 to 3.6%.
Si : 0.5〜1.2%・・・Siは0.5%未満
では黒鉛の量が少なくなり硬くて脆くなる。一方、1.
2%を超えると黒鉛量が多くなりすぎて軟らかくなり耐
摩耗性が低下するので、0.5〜1.2%の範囲に規定
する。Si: 0.5 to 1.2%...If Si is less than 0.5%, the amount of graphite decreases, making it hard and brittle. On the other hand, 1.
If it exceeds 2%, the amount of graphite becomes too large and becomes soft, resulting in decreased wear resistance, so it is specified within the range of 0.5 to 1.2%.
Mn : 0.3〜1.0%−Mnは0.3%未満では
ロール胴表面に白鉄層を生じ、鋳放し時の高温割れの原
因になる。一方、1.0%を超えると炭化物の形状を粗
大にし材質を脆化させるので、0.3〜1.0%の範囲
に規定する。Mn: 0.3 to 1.0% - If Mn is less than 0.3%, a white iron layer is formed on the surface of the roll body, causing hot cracking during as-casting. On the other hand, if it exceeds 1.0%, the shape of the carbide becomes coarse and the material becomes brittle, so it is specified in the range of 0.3 to 1.0%.
P:0.2%以下・・・Pは溶湯の流動性を増加させる
が材質を脆弱にするため、0.2%以下とする。P: 0.2% or less...P increases the fluidity of the molten metal but makes the material brittle, so it should be 0.2% or less.
S:0.06%以下・・・Sはロール製造上の必要元素
ではなくて不純物として取り扱う、したがって、0.0
6%以下とする。S: 0.06% or less...S is not a necessary element in roll manufacturing, but is treated as an impurity, therefore 0.0
6% or less.
Ni : 1.3〜4.6%・・・Niは基地硬度を上
昇させるが1.3%未満ではその効果が充分ではなく、
4.8%を超えて含有させると残留オーステナイトの量
が増すのみで鋳放し硬度が下がるため、1.3〜4.6
%とする。Ni: 1.3 to 4.6%...Ni increases base hardness, but if it is less than 1.3%, the effect is not sufficient.
If the content exceeds 4.8%, the amount of retained austenite only increases and the as-cast hardness decreases, so it is 1.3 to 4.6%.
%.
Cr:0.9〜2.1%・・・Crは炭化物生成元素で
あリ、Cとともに耐摩耗性の向上に寄与する。0.93
未満ではその効果が充分ではなく、2.1%を超えて含
有させるとセメンタイト量が多くなり脆化してしまうの
で、0,8〜2.1%の範囲に規定する。Cr: 0.9 to 2.1%...Cr is a carbide-forming element, and together with C, contributes to improving wear resistance. 0.93
If the content is less than 2.1%, the effect will not be sufficient, and if it exceeds 2.1%, the amount of cementite will increase and become brittle, so the content is specified in the range of 0.8 to 2.1%.
Mo:1.0%以下・・・Noは基地硬度を高める効果
を有するが、1.0%を超えると脆くなりまた不経済で
もあるので、1.0%以下とする。Mo: 1.0% or less...No has the effect of increasing base hardness, but if it exceeds 1.0%, it becomes brittle and uneconomical, so it is set to 1.0% or less.
I■高クロム鋳鉄
外層は高クロムロールとしての所定の特性を持たせるた
めに、Orを10〜20%含有するものとする。すなわ
ち、充分な耐摩耗性を維持するために必要なCr炭化物
の晶出はOrの含有量が10%未満では不充分であり、
また充分な耐肌荒れ性を有するためにはOrの含有量が
20%を超えるとマトリックス中に固溶されるCrが過
多となリオーステナイトやフェライトを形成しやすく熱
伝導率の低下等をきたして有害となるからである。I) The high chromium cast iron outer layer shall contain 10 to 20% Or in order to have the desired characteristics as a high chromium roll. That is, the crystallization of Cr carbide necessary to maintain sufficient wear resistance is insufficient when the Or content is less than 10%.
In addition, in order to have sufficient roughness resistance, if the Or content exceeds 20%, too much Cr will be dissolved in the matrix, which tends to form riostenite and ferrite, resulting in a decrease in thermal conductivity. This is because it is harmful.
なお外層の高クロム鋳鉄については、Or以外の成分に
ついては特に限定しないが、従来の高クロムロールの場
合と同様に、C2,0〜3.2%程度、Si 0.5〜
1.5%程度、Mo 0.3〜4%程度を含むのが通常
であり、またこのほかXi 1.5%以下、Nb1.0
%程度以下、■1.0%程度以下を含有していてもよい
。Regarding the high chromium cast iron of the outer layer, the components other than Or are not particularly limited, but as in the case of conventional high chromium rolls, C2, about 0 to 3.2%, Si 0.5 to
It usually contains about 1.5%, Mo about 0.3 to 4%, and in addition, Xi 1.5% or less, Nb 1.0
% or less, (1) may contain about 1.0% or less.
■球状黒鉛鋼
C:1.0〜2.0%・・・Cは基地中に溶は込んで強
度を確保するとともに、耐摩耗性に有効な炭化物を生成
する。また一部はグラファイトとなって耐熱亀裂性南北
に寄与する。しかし、Cの含有量が1.0%未満では上
記効果を得ることができず、一方2.0%を超えるとグ
ラファイトが球状ではなくなる傾向にあり、強靭性を劣
化させる。したがって、Cは1.0〜2.0%の範囲内
とする。■ Spheroidal graphite steel C: 1.0 to 2.0%...C melts into the matrix to ensure strength and produces carbides effective for wear resistance. In addition, some of it becomes graphite and contributes to the north-south resistance to heat cracking. However, if the C content is less than 1.0%, the above effects cannot be obtained, while if it exceeds 2.0%, the graphite tends to lose its spherical shape, resulting in deterioration of toughness. Therefore, C should be within the range of 1.0 to 2.0%.
Si + 1.0〜3.0%・・・Slは前記のグラフ
ァイトを晶出させるに有効な元素であるが、含有量が1
.0%未満ではその効果が期待できず、また一方3.0
%を超えればフェライト中に溶は込んだSiが材質の強
靭性を劣化させるので、Siの含有量は1.0〜3.0
%の範囲内とする。Si + 1.0 to 3.0%...Sl is an element effective in crystallizing the graphite mentioned above, but when the content is 1.0% to 3.0%...
.. If it is less than 0%, the effect cannot be expected, and on the other hand, if it is 3.0%,
If the Si content exceeds 1.0 to 3.0%, the Si dissolved in the ferrite will deteriorate the toughness of the material.
Within the range of %.
Mn’+ 0.2〜1.0%・・・Mnは焼入性向上元
素として知られており、この効果を最大限に引き出すと
ともに、多すぎた場合の粒界への偏析が靭性を劣化させ
ることを考慮して、その範囲を0.2〜1.0%とする
。Mn'+ 0.2-1.0%...Mn is known as an element that improves hardenability, and while maximizing this effect, if too much is present, segregation to grain boundaries will deteriorate toughness. In consideration of this, the range is set to 0.2 to 1.0%.
P:0.1%以下・・・Pは溶湯の流動性を増加させる
ものの、材質を脆弱にするとともに鋳造欠陥の原因にも
なるため、その含有量は低いほど望ましく、0.1%以
下とする。P: 0.1% or less... P increases the fluidity of the molten metal, but it also makes the material brittle and causes casting defects, so the lower the content, the better, and 0.1% or less. do.
S:0.1%以下・・・SはPと同様に材質の脆弱化及
び鋳造欠陥を招くため、含有量は可及的に低いことが望
ましく、0.1%以下とする。S: 0.1% or less...Similar to P, S causes weakening of the material and casting defects, so the content is desirably as low as possible, and is set to 0.1% or less.
Ni : 0.1〜1.0%・・・Niは強度及び靭性
の確保に有効であるが、0.1%未満ではその効果が不
充分であり、また1、0%を超えてもその効果はほとん
ど飽和し、しかもコスト上昇を招くためその含有量は必
要かつ充分なO91〜1.0%とした。Ni: 0.1 to 1.0%...Ni is effective in ensuring strength and toughness, but if it is less than 0.1%, the effect is insufficient, and if it exceeds 1.0%, the effect is insufficient. Since the effect is almost saturated and the cost increases, the content is set to a necessary and sufficient O91 to 1.0%.
Cr:0.1〜1.0%・・・Crは基地の強化に寄与
するが、0.1%未満ではその効果がなく、一方1.0
%を超えるとグラファイトが晶出しにくくなって強靭性
を劣化させる。したがって、0.1〜1.0%とした。Cr: 0.1-1.0%...Cr contributes to strengthening the base, but less than 0.1% has no effect, while 1.0%
%, it becomes difficult for graphite to crystallize and the toughness deteriorates. Therefore, it was set at 0.1 to 1.0%.
Mo:0.1〜1.0%・・・MoはXiと同様に強靭
性を増加させる。しかし、0.1%未満ではその効果が
なく、一方1.Q%を超えても、添加量増加の割合に比
して効果の増加は僅かとなる。したがって経済性も考慮
して、その含有量を0.1〜1.0%とした。Mo: 0.1 to 1.0%...Mo increases toughness similarly to Xi. However, if it is less than 0.1%, it has no effect; on the other hand, 1. Even if it exceeds Q%, the increase in effect will be small compared to the rate of increase in the amount added. Therefore, considering economic efficiency, the content was set to 0.1 to 1.0%.
しかして、本発明の圧延ロール用複合スリーブは、以下
の如くして製造される。Thus, the composite sleeve for mill rolls of the present invention is manufactured as follows.
■ダクタイル鋳鉄、ニッケルグレン鋳鉄、高クロム鋳鉄
等からなる外層溶湯を遠心鋳造して外殻層(中空状外層
)を形成する。■Outer layer molten metal made of ductile cast iron, nickel grain cast iron, high chromium cast iron, etc. is centrifugally cast to form an outer shell layer (hollow outer layer).
■上記外層内に球状黒鉛鋼等からなる内層溶湯を鋳込む
、この時、外層材と内層材を完全に溶着させるとともに
、内外層の境界近傍に巣の発生を皆無にする必要がある
。■Inner layer molten metal made of spheroidal graphite steel, etc. is cast into the above outer layer. At this time, it is necessary to completely weld the outer layer material and the inner layer material, and to eliminate the occurrence of cavities near the boundary between the inner and outer layers.
■そこで、本発明にあっては、上記■において内層溶湯
が外殻層内に鋳込まれる時、内層溶湯が外殻層内表面を
溶かし、内層中に外層材を適正量外殻層内面の溶込量が
少ないと内外層の境界付近に巣(欠陥)を生じ、溶込量
が多すぎると内層材質の靭性低下をもたらす、したがっ
て、上記■にあっては、内層中への外層材の混入率が内
外層の材質の組合せに応じて予め最適化された値となる
ように、適正な鋳造条件にて鋳造する必要がある。■ Therefore, in the present invention, when the inner layer molten metal is cast into the outer shell layer in the above step (■), the inner layer molten metal melts the inner surface of the outer shell layer, and an appropriate amount of the outer layer material is poured into the inner layer on the inner surface of the outer shell layer. If the amount of penetration is small, cavities (defects) will occur near the boundary between the inner and outer layers, and if the amount of penetration is too large, the toughness of the inner layer material will decrease. It is necessary to perform casting under appropriate casting conditions so that the mixing ratio becomes a value optimized in advance according to the combination of materials for the inner and outer layers.
しかして、発明者の知見によれば、適正なる鋳造条件を
満足させ得る場合の幾つかを列挙すると次の通りである
。According to the inventor's findings, some cases where appropriate casting conditions can be satisfied are listed below.
(A)外層溶湯の注入温度、成分によって定まる凝固温
度を100℃程度上廻る加熱温度を採用して鋳造する。(A) Casting is performed using a heating temperature that is approximately 100°C higher than the solidification temperature determined by the injection temperature and components of the outer layer molten metal.
(B)内外層境界部における欠萬発生を防止するため、
遠心鋳造時の重力倍数(遠心力が重力の何倍になるかを
示す数値: GNO)が、外層溶湯鋳込後の外層溶湯内
面においてGNO≧70となるように設定する(第2図
参照)。(B) To prevent defects from occurring at the boundary between the inner and outer layers,
The gravity multiplier (number indicating how many times the centrifugal force is compared to gravity: GNO) during centrifugal casting is set so that GNO≧70 on the inner surface of the outer layer molten metal after pouring the outer layer molten metal (see Figure 2). .
(C)内外層境界部における欠陥発生を防止するため、
内層溶湯の注入厚を41)+m以上とする(第3図参照
)。(C) To prevent defects from occurring at the boundary between the inner and outer layers,
The injection thickness of the inner layer molten metal is set to 41)+m or more (see Fig. 3).
(D)内層強度を確保し、かつ内外層境界部における欠
陥発生を防止するため、■外層材をダクタイル鋳鉄、内
層材を球状黒鉛鋼とする場合には内層への外層材混入率
が10〜40%となることを目標として鋳造しく第4図
、第5図参照)、■外層材をニッケルグレン鋳鉄、内層
材を球状黒鉛鋼とする場合には内層への外層材混入率が
10〜40%となることを目標として鋳造しく第4図、
第5図参照)、■外層材を高クロム鋳鉄、内層材を球状
黒鉛鋼する場合には内層への外層混入率が2〜15%と
なることを目標として鋳造する(第6図、第7図参照)
。(D) In order to ensure the strength of the inner layer and prevent the occurrence of defects at the boundary between the inner and outer layers, ■ When the outer layer material is ductile cast iron and the inner layer material is spheroidal graphite steel, the mixing ratio of the outer layer material into the inner layer is 10 to 10%. If the outer layer material is nickel grain cast iron and the inner layer material is spheroidal graphite steel, the mixing rate of the outer layer material into the inner layer is 10 to 40%. Figure 4.
(Refer to Figure 5), ■ If the outer layer material is high chromium cast iron and the inner layer material is spheroidal graphite steel, casting should be performed with the goal of mixing the outer layer into the inner layer at a rate of 2 to 15% (Figures 6 and 7). (see figure)
.
以Fの鋳造条件(A)〜(D)を採用することにより、
内層はもとより、内外層境界部の機械的性質を著しく向
上し、特に引張強さと衝撃値が著しく向上した複合スリ
ーブを得ることができる。By adopting the following casting conditions (A) to (D),
It is possible to obtain a composite sleeve in which the mechanical properties of not only the inner layer but also the interface between the inner and outer layers are significantly improved, and in particular, the tensile strength and impact value are significantly improved.
以下、本発明の具体的実施結果について説明する。Hereinafter, specific implementation results of the present invention will be explained.
■第1表にダクタイル鋳鉄からなる外層材、球状黒鉛鋼
からなる内層材の化学組成を示した。外径860mmφ
、内径400■■φ、長さ2600■曹のスリーブロー
ル素材を上記組成の外層材と内層材にて製造すべく、外
層材凝固後120mm 、残りを内層材溶湯とした構成
で遠心鋳造した。この時の注入温度は、外層材溶湯が1
330℃、外層材凝固後の中空部内に注入した内層材溶
湯が1530℃であり、外層材溶湯を遠心鋳造後、31
分経過してから内層材溶湯を注入した。得られた複合ス
リーブは、凝固後熱処理を施し、機械加工を行なって、
H型鋼圧延用ユニバーサルミルの竪ロールに供したが、
事故もなく順調に圧延することができた。なお、内層へ
の外層材混入率は30.3%であり、内外層境界付近の
欠陥は皆無であった。■Table 1 shows the chemical compositions of the outer layer material made of ductile cast iron and the inner layer material made of spheroidal graphite steel. Outer diameter 860mmφ
In order to manufacture a sleeve roll material having an inner diameter of 400 mm and a length of 2600 mm by using an outer layer material and an inner layer material having the above composition, centrifugal casting was performed with the outer layer material being solidified to a thickness of 120 mm and the remaining material being a molten inner layer material. The injection temperature at this time is such that the molten metal for the outer layer is 1
The temperature of the molten inner layer material injected into the hollow part after solidification of the outer layer material was 1530°C, and the temperature of the molten outer layer material was 31°C after centrifugal casting.
After a few minutes had elapsed, the molten metal for the inner layer material was injected. The obtained composite sleeve was subjected to post-solidification heat treatment and mechanical processing.
It was subjected to a vertical roll of a universal mill for H-type steel rolling, but
Rolling was carried out smoothly without any accidents. The mixing rate of the outer layer material into the inner layer was 30.3%, and there were no defects near the boundary between the inner and outer layers.
■第2表にニッケルグレン鋳鉄からなる外層材、球状黒
鉛鋼からなる内層材の化学組成を示した。外径900醜
■Φ、内径460■麿φ、長さ1800■■のスリーブ
ロール素材を上記組成の外層材と内層材にて製造すべく
、外層材凝固後105雪重、残りを内層材溶湯とした構
成で遠心鋳造した。この時の注入温度は、外層材溶湯が
1320℃、内層材溶湯が1520℃であり、外層材溶
湯の遠心鋳造後、21分経過してから外層中空内に内層
材溶湯を注入した。得られた複合スリーブは、凝固後熱
処理を施し、機械加工を行なって、H型鋼圧延用ユニバ
ーサルミルの竪ロールに供したが、事故もなく順調に圧
延することができた。なお、内層への外層材混入率は2
5.4%であり、内外層境界付近の欠陥は皆無であった
・
■第3表に高クロム鋳鉄からなる外層材、球状黒鉛鋼か
らなる内層材の化学組成を示した。外径980諺曹φ、
内径540■■φ、長さ800璽履のスリーブロール素
材を上記組成の外層材と内層材にて製造すべく、外層材
凝固後130m■、残りを内層材溶湯とした構成で遠心
鋳造した。この時の注入温度は、外層材溶湯が1420
℃、内層材溶湯゛が1520℃であり、外層材溶湯の遠
心鋳造後、34分経過してから外層中空内に内層材溶湯
を注入した。得られた複合スリーブは、凝固後熱処理を
施し、機械加工を行なって、H型鋼圧延用ユニバーサル
ミルの水平ロールに供したが、事故もなく順調に圧延す
ることができた。なお、内層への外層材混入率は3.2
%であり、内外層境界付近の欠陥は皆無であった。■Table 2 shows the chemical compositions of the outer layer material made of nickel grain cast iron and the inner layer material made of spheroidal graphite steel. In order to manufacture a sleeve roll material with an outer diameter of 900 Φ, an inner diameter of 460 Φ, and a length of 1800 Φ using the outer layer material and inner layer material of the above composition, after solidifying the outer layer material, 105 snow weight, and the rest the inner layer material molten metal. Centrifugal casting was performed using the following configuration. The injection temperature at this time was 1320° C. for the outer layer material molten metal and 1520° C. for the inner layer material molten metal, and the inner layer material molten metal was injected into the outer layer hollow 21 minutes after centrifugal casting of the outer layer material molten metal. The obtained composite sleeve was subjected to heat treatment after solidification, machined, and subjected to vertical rolls of a universal mill for rolling H-type steel, and was successfully rolled without any accidents. The mixing rate of the outer layer material into the inner layer is 2.
5.4%, and there were no defects near the boundary between the inner and outer layers. Table 3 shows the chemical compositions of the outer layer material made of high chromium cast iron and the inner layer material made of spheroidal graphite steel. Outer diameter 980 φ,
In order to manufacture a sleeve roll material with an inner diameter of 540 mm and a length of 800 mm using the outer layer material and inner layer material having the above composition, centrifugal casting was performed after solidifying the outer layer material for 130 m and leaving the remainder as the molten inner layer material. At this time, the injection temperature was 1420℃ for the outer layer material molten metal.
The temperature of the molten inner layer material was 1,520° C., and the molten inner layer material was injected into the hollow outer layer 34 minutes after centrifugal casting of the molten outer layer material. The obtained composite sleeve was subjected to post-solidification heat treatment, machined, and subjected to horizontal rolls of a universal mill for rolling H-type steel, and was successfully rolled without any accidents. The mixing rate of outer layer material into the inner layer is 3.2.
%, and there were no defects near the boundary between the inner and outer layers.
すなわち、上記各実施例によって明らかなように、ダク
タイル鋳鉄、ニッケルグレン鋳鉄もしくは高クロム鋳鉄
にて外層を形成し、球状黒鉛鋼にて内層を形成して複合
スリーブとすることにより、H型鋼圧延用ユニバーサル
ミルのロールに適用しても割損事故等を招くことのない
、耐摩耗性や耐焼付性に優れた外層と強靭性に優れた内
層からなる複合スリーブが得られた。したがって、高負
荷圧延分野へのダクタイル鋳鉄ロール、ニッケルグレン
鋳鉄ロール、もしくは高クロム鋳鉄ロールの実質的な適
用が可能となり、その使用成績を向上させることができ
た。That is, as is clear from the above examples, by forming the outer layer with ductile cast iron, nickel grain cast iron or high chromium cast iron and forming the inner layer with spheroidal graphite steel to form a composite sleeve, it is possible to obtain a composite sleeve for rolling H-shaped steel. A composite sleeve consisting of an outer layer with excellent wear resistance and seizure resistance and an inner layer with excellent toughness, which does not cause breakage accidents even when applied to the roll of a universal mill, was obtained. Therefore, it has become possible to practically apply ductile cast iron rolls, nickel grain cast iron rolls, or high chromium cast iron rolls to the field of high-load rolling, and it has been possible to improve the performance of their use.
[発明の効果]
以上のように、本発明によれば、外層については耐摩耗
性や耐焼付性に優れ、内層については強靭性に優れた圧
延ロール用複合スリーブ及びその製造方法を提供するこ
とができる。[Effects of the Invention] As described above, the present invention provides a composite sleeve for rolling rolls in which the outer layer has excellent wear resistance and seizure resistance, and the inner layer has excellent toughness, and a method for manufacturing the same. Can be done.
【図面の簡単な説明】
第1図は内外層境界付近に発生した欠陥の状態を示す模
式図、第2図は外層溶湯内面の重力倍数と境界部欠陥点
数との関係を示す線図、第3図は内層溶湯の注入厚と境
界部欠陥点数との関係を示す線図、第4図は外層材をダ
クタイル鋳鉄もしくはニッケルグレン鋳鉄とする場合の
外層材混入率と境界部欠陥点数との関係を示す線図、第
5図は外層材をダクタイル鋳鉄もしくはニッケルグレン
鋳鉄とする場合の外層材混入率と内層強靭性との関係を
示す線図、第6図は外層材を高クロム鋳鉄とする場合の
外層材混入率と境界部欠陥点数との関係を示す線図、第
7図は外層材を高クロム鋳鉄とする場合の外層材混入率
と内層強靭性との関係を示す線図である。
代理人 弁理士 塩 川 修 油
温1表
第2表
第1図
第2図
外層i容湯内面のGN□(重力俯数)
第3図
内層溶湯の注入源(mm)
第4図
内層への外層材ヲ昆人率(炒)
第 5 図
内層への外層材温入牢(丞)
+00ヅ0とした場合に対す
る引張強さの比率
第6図[Brief explanation of the drawings] Fig. 1 is a schematic diagram showing the state of defects occurring near the boundary between the inner and outer layers, Fig. 2 is a diagram showing the relationship between the gravity multiple of the inner surface of the outer layer molten metal and the number of defect points at the boundary, Figure 3 is a diagram showing the relationship between the injection thickness of the inner layer molten metal and the number of defect points at the boundary, and Figure 4 is a diagram showing the relationship between the mixing ratio of the outer layer material and the number of defect points at the boundary when the outer layer material is ductile cast iron or nickel grain cast iron. Figure 5 is a diagram showing the relationship between the outer layer material content and inner layer toughness when the outer layer material is ductile cast iron or nickel grain cast iron, and Figure 6 is a diagram showing the relationship between the outer layer material and the inner layer toughness when the outer layer material is high chromium cast iron. Fig. 7 is a diagram showing the relationship between the mixing ratio of the outer layer material and the number of boundary defect points in the case where the outer layer material is high chromium cast iron. . Agent Patent Attorney Osamu Shiokawa Oil Temperature 1 Table 2 Table 1 Figure 2 Figure 2 GN□ (gravitational depression) of the inner surface of the outer layer molten metal Figure 3 Injection source of the inner layer molten metal (mm) Figure 4 Injection into the inner layer Figure 5. Temperature of the outer layer material into the inner layer. Ratio of tensile strength to +00゜0 Figure 6.
Claims (6)
延ロール用複合スリーブにおいて、上記内層材を鋼系材
料とし、外層材を鋳鉄系材料とすることを特徴とする圧
延ロール用複合スリーブ。(1) A composite sleeve for rolling rolls in which the inner layer material and the outer layer material are each made of different materials, wherein the inner layer material is a steel-based material and the outer layer material is a cast iron-based material.
鉛鋼とし、外層材をダクタイル鋳鉄とする圧延ロール用
複合スリーブ。(2) A composite sleeve for a rolling roll according to claim 1, wherein the inner layer material is made of spheroidal graphite steel and the outer layer material is made of ductile cast iron.
鉛鋼をとし、外層材をニッケルグレン鋳鉄とする圧延ロ
ール用複合スリーブ。(3) A composite sleeve for a rolling roll according to claim 1, wherein the inner layer material is made of spheroidal graphite steel and the outer layer material is made of nickel grain cast iron.
鉛鋼とし、外層材を高クロム鋳鉄とする圧延ロール用複
合スリーブ。(4) A composite sleeve for rolling rolls according to claim 1, wherein the inner layer material is made of spheroidal graphite steel and the outer layer material is made of high chromium cast iron.
圧延ロール用複合スリーブの製造方法において、上記外
層溶湯を鋳鉄系とし、該外層溶湯を鋳込して外殻層を形
成した後、上記内層溶湯を鋼系とし、該内層溶湯を鋳込
む際に上記外殻層内表面を内層溶湯により所定量溶かし
、内層中に外層材を混入させて溶着一体化させることを
特徴とする圧延ロール用複合スリーブの製造方法。(5) In the method for manufacturing a composite sleeve for a rolling roll, in which the outer layer molten metal is poured and the inner layer molten metal is poured by centrifugal casting, the outer layer molten metal is cast iron-based, and the outer layer molten metal is cast to form an outer shell layer. After that, the inner layer molten metal is made of steel, and when the inner layer molten metal is cast, a predetermined amount of the inner surface of the outer shell layer is melted by the inner layer molten metal, and the outer layer material is mixed into the inner layer and welded and integrated. A method for manufacturing a composite sleeve for rolling rolls.
た外層材重量が内層溶湯重量に対してなす外層材混入率
が下記の(a)〜(c)の如くである圧延ロール用複合
スリーブの製造方法。 (a)外層材がダクタイル鋳鉄、内層材が球状黒鉛鋼で
ある時の混入率:10〜40% (b)外層材がニッケルグレン鋳鉄、内層材が球状黒鉛
鋼である時の混入率:10〜40% (c)外層材が高クロム鋳鉄、内層材が球状黒鉛鋼であ
る時の混入率:2〜15%(6) In claim 5, the composite for rolling rolls has a mixing ratio of the outer layer material mixed into the inner layer with respect to the weight of the inner layer molten metal as shown in (a) to (c) below. How to make a sleeve. (a) Mixing rate when the outer layer material is ductile cast iron and the inner layer material is spheroidal graphite steel: 10 to 40% (b) Mixing rate when the outer layer material is nickel grain cast iron and the inner layer material is spheroidal graphite steel: 10 ~40% (c) Contamination rate when the outer layer material is high chromium cast iron and the inner layer material is spheroidal graphite steel: 2 to 15%
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62123988A JPH0669577B2 (en) | 1987-05-22 | 1987-05-22 | Composite sleeve for rolling roll and method of manufacturing the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62123988A JPH0669577B2 (en) | 1987-05-22 | 1987-05-22 | Composite sleeve for rolling roll and method of manufacturing the same |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63290609A true JPS63290609A (en) | 1988-11-28 |
JPH0669577B2 JPH0669577B2 (en) | 1994-09-07 |
Family
ID=14874262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62123988A Expired - Fee Related JPH0669577B2 (en) | 1987-05-22 | 1987-05-22 | Composite sleeve for rolling roll and method of manufacturing the same |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0669577B2 (en) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49123158A (en) * | 1973-03-30 | 1974-11-25 | ||
JPS5324371A (en) * | 1976-08-18 | 1978-03-07 | Inoue Japax Res | Method of jointing rubber and synthetic resin |
JPS55153659A (en) * | 1979-05-14 | 1980-11-29 | Kubota Ltd | Composite sleeve roll for h-beam steel polling |
JPS5855552A (en) * | 1981-09-29 | 1983-04-01 | Kubota Ltd | Composite sleeve roll for rolling h-steel and preparation thereof |
JPS5930484A (en) * | 1982-08-11 | 1984-02-18 | Hoshi Jiro | Production of thin-walled hollow spherical shell of stainless steel |
JPS6021003A (en) * | 1983-07-14 | 1985-02-02 | Nec Corp | Manufacture of solid-state image pickup element |
JPS61176408A (en) * | 1985-01-31 | 1986-08-08 | Kubota Ltd | Composite ring roll |
JPS61176409A (en) * | 1985-01-31 | 1986-08-08 | Kubota Ltd | Composite ring roll |
-
1987
- 1987-05-22 JP JP62123988A patent/JPH0669577B2/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49123158A (en) * | 1973-03-30 | 1974-11-25 | ||
JPS5324371A (en) * | 1976-08-18 | 1978-03-07 | Inoue Japax Res | Method of jointing rubber and synthetic resin |
JPS55153659A (en) * | 1979-05-14 | 1980-11-29 | Kubota Ltd | Composite sleeve roll for h-beam steel polling |
JPS5855552A (en) * | 1981-09-29 | 1983-04-01 | Kubota Ltd | Composite sleeve roll for rolling h-steel and preparation thereof |
JPS5930484A (en) * | 1982-08-11 | 1984-02-18 | Hoshi Jiro | Production of thin-walled hollow spherical shell of stainless steel |
JPS6021003A (en) * | 1983-07-14 | 1985-02-02 | Nec Corp | Manufacture of solid-state image pickup element |
JPS61176408A (en) * | 1985-01-31 | 1986-08-08 | Kubota Ltd | Composite ring roll |
JPS61176409A (en) * | 1985-01-31 | 1986-08-08 | Kubota Ltd | Composite ring roll |
Also Published As
Publication number | Publication date |
---|---|
JPH0669577B2 (en) | 1994-09-07 |
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