JP2003275809A - Composite roll for rolling - Google Patents
Composite roll for rollingInfo
- Publication number
- JP2003275809A JP2003275809A JP2002074608A JP2002074608A JP2003275809A JP 2003275809 A JP2003275809 A JP 2003275809A JP 2002074608 A JP2002074608 A JP 2002074608A JP 2002074608 A JP2002074608 A JP 2002074608A JP 2003275809 A JP2003275809 A JP 2003275809A
- Authority
- JP
- Japan
- Prior art keywords
- layer material
- inner layer
- rolling
- composite roll
- outer 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.)
- Granted
Links
Landscapes
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、薄帯材、板材、線
材、棒材などの鋼材をはじめとする金属材の圧延に用い
られる圧延用ロールに関し、特に靭性に優れる材料から
なる内層材と、この内層材の外周に超硬合金からなる外
層材を備えた超硬合金製圧延用複合ロールに関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling roll used for rolling a metal material such as a steel material such as a strip material, a plate material, a wire material and a bar material, and an inner layer material made of a material having excellent toughness. The present invention relates to a cemented carbide rolling roll having an outer layer material made of cemented carbide on the outer circumference of the inner layer material.
【0002】[0002]
【従来の技術】寸法精度の向上など圧延材に対する高品
質化、あるいはロール替え工数減少による生産性向上の
要求に応えるため、耐摩耗性、耐肌荒れ性などに優れた
炭化タングステン(WC)系超硬合金が線材、棒鋼、平
鋼、帯鋼などの圧延用ロールに適用されている。WC系
超硬合金は公知のごとく、WCをCo、Ni、Crなど
の金属元素で結合した焼結合金である。2. Description of the Related Art In order to meet the demand for higher quality of rolled materials such as improved dimensional accuracy, and improved productivity by reducing the number of man-hours required to change rolls, tungsten carbide (WC) -based alloys excellent in wear resistance and surface roughness are used. Hard alloys are applied to rolling rolls such as wire rods, steel bars, flat steels, and strip steels. As is well known, the WC-based cemented carbide is a sintered alloy in which WC is bonded with a metal element such as Co, Ni or Cr.
【0003】超硬合金を圧延用ロールとして使用するた
め、靭性に優れた内層材と金属接合した複合ロールが開
発されている。例えば特開2001−47111号公報
には、超硬合金からなる外層材と内層材との間に中間層
を有するとともに、内層材と中間層との間に金属層が介
在している複合ロールが開示されている。Since a cemented carbide is used as a rolling roll, a composite roll which is metal-bonded to an inner layer material having excellent toughness has been developed. For example, Japanese Patent Application Laid-Open No. 2001-47111 discloses a composite roll having an intermediate layer between an outer layer material and an inner layer material made of cemented carbide and a metal layer interposed between the inner layer material and the intermediate layer. It is disclosed.
【0004】[0004]
【発明が解決しようとする課題】前記従来の複合ロール
は優れた性能を有するが、超硬合金からなる外層材と鋼
などの内層材を接合するため、両者の間に傾斜層あるい
は金属からなる中間層を介在させる必要がある。これ
は、超硬合金からなる外層材と鉄系材からなる内層材を
直接金属接合すると炭素活量の高い外層材から内層材に
炭素が拡散し、境界接合部付近の外層材の炭素が減少す
るため、WC−Co2層域の化学量論組成より炭素が減
少し、η相が発生し材質が脆化するためである。中間層
を有していてもその厚みが十分でない場合、焼結接合時
にこの中間層を越えて炭素が拡散移動するため、外層材
の境界接合部にη相が出現する。このようにある一定以
上の厚みを持った中間層を設けることにより、圧延ロー
ルの境界接合部は十分な強度を得ることができるが、製
造にあたっては中間層を形成させる工程が必要となる。The above-mentioned conventional composite roll has excellent performance, but since the outer layer material made of cemented carbide and the inner layer material such as steel are joined together, a graded layer or metal is formed between them. It is necessary to interpose an intermediate layer. This is because when the outer layer material made of cemented carbide and the inner layer material made of iron-based material are directly metal-bonded, carbon diffuses from the outer layer material with high carbon activity to the inner layer material, and the carbon in the outer layer material near the boundary joint decreases. Therefore, carbon is reduced from the stoichiometric composition in the WC—Co 2 layer region, the η phase is generated, and the material becomes brittle. Even if the intermediate layer is provided, if the thickness is not sufficient, carbon diffuses and migrates over the intermediate layer during sinter joining, so that the η phase appears at the boundary joining part of the outer layer material. By providing the intermediate layer having a certain thickness or more as described above, the boundary bonding portion of the rolling roll can obtain sufficient strength, but a step of forming the intermediate layer is required in manufacturing.
【0005】超硬合金のような粉末合金系の複合ロール
を製造する際に、熱間静水圧プレス(HIP)法を用い
ることが広く知られている。熱間静水圧プレスで粉末合
金を焼結製造する際には、原料となる合金粉末を鋼製の
HIP缶と呼ばれる容器に充填し、溶接によって密封し
た後、HIP缶内を脱気して、HIP処理を行なうのが
一般的である。この方法を用いて複合ロールを製造する
際、内層材となる中空円筒状のスリーブあるいは中実の
軸材を予めHIP缶内に設置し、この内層材とHIP缶
との間の空隙に外層材となる原料粉末を充填し、HIP
缶を溶接密封後、HIP処理を行い、外層材を焼結する
と同時に内層材とも接合して製造することができる。It is widely known to use a hot isostatic pressing (HIP) method when manufacturing a powder alloy type composite roll such as cemented carbide. When a powder alloy is sintered and manufactured by a hot isostatic press, the alloy powder as a raw material is filled in a container called a steel HIP can and sealed by welding, and then the inside of the HIP can is deaerated. HIP processing is generally performed. When manufacturing a composite roll using this method, a hollow cylindrical sleeve or a solid shaft material to be an inner layer material is previously installed in a HIP can, and an outer layer material is placed in a space between the inner layer material and the HIP can. HIP
After the can is welded and hermetically sealed, HIP treatment is performed to sinter the outer layer material and at the same time join the inner layer material to manufacture the can.
【0006】しかしながら、外層材と内層材の間に中間
層が必要な場合、HIP缶内に外層材用粉末と中間層用
粉末の2種類の粉末を2層に分けて充填しなくてはなら
ない。このような充填方法では、ロール軸方向にわたっ
て粉末組成、厚みを均一に安定させることが非常に困難
である。特開2001−47111号公報では、その実
施例において、HIP缶への充填の際、外層材が形成さ
れる部分と中間層が形成される部分の間に仕切り材を設
け、外層材用粉末と中間層用粉末を充填する技術が開示
されている。しかし、このような方法でも2種類の粉末
が混合することを完全に防止することは、困難であり手
間も掛かる。However, when an intermediate layer is required between the outer layer material and the inner layer material, it is necessary to fill the HIP can with two types of powders, the outer layer material powder and the intermediate layer powder, in two layers. . With such a filling method, it is very difficult to stabilize the powder composition and thickness uniformly in the roll axial direction. In JP-A-2001-47111, in that example, a partition material is provided between the portion where the outer layer material is formed and the portion where the intermediate layer is formed, when filling the HIP can, and the powder for the outer layer material is provided. A technique for filling the powder for the intermediate layer is disclosed. However, even with such a method, it is difficult and time-consuming to completely prevent the two kinds of powders from being mixed.
【0007】本発明の目的は、超硬合金製圧延用複合ロ
ールを製造するにあたり、施工の困難な中間層を必要と
せず、しかも強度の十分高い境界接合部が得られる圧延
用複合ロールを提供することである。An object of the present invention is to provide a composite roll for rolling which does not require an intermediate layer which is difficult to construct in manufacturing a composite roll for cemented carbide rolling and which can obtain a boundary joint portion having sufficiently high strength. It is to be.
【0008】[0008]
【課題を解決するための手段】本発明の圧延用複合ロー
ルは、C:0.5重量%以上を含む鉄系合金からなる内
層材の外周に、WC系超硬合金からなる外層材が実質的
に直接に金属接合された圧延用複合ロールであって、J
IS R1601に準拠した抗折試験において、外層材
と内層材との境界接合部を含む抗折試験片の抗折強度が
600MPa以上であることを特徴とする。なお、本発
明でいう実質的に直接に金属接合されるとは、外層材と
内層材との間に中間層を施工により介在させないで外層
材と内層材を金属接合させることをいう。In the composite roll for rolling of the present invention, an outer layer material made of WC type cemented carbide is substantially provided on the outer periphery of an inner layer material made of an iron type alloy containing C: 0.5% by weight or more. A composite roll for direct metallurgical joining, comprising:
In a bending test according to IS R1601, a bending strength of a bending test piece including a boundary joint between an outer layer material and an inner layer material is 600 MPa or more. The term “substantially directly metal-bonding” as used in the present invention means that the outer-layer material and the inner-layer material are metal-bonded without an intermediate layer being interposed between the outer-layer material and the inner-layer material.
【0009】また第2の本発明の圧延用複合ロールは、
C:0.5重量%以上を含む鉄系合金からなる内層材の
外周に、WC系超硬合金からなる外層材が、厚み1mm
以下の中間層を外層材と内層材との間に介在させて金属
接合された圧延用複合ロールであって、JIS R16
01に準拠した抗折試験において、外層材と内層材との
境界接合部を含む抗折試験片の抗折強度が600MPa
以上であることを特徴とする。また、これらの本発明に
おいて、前記内層材にCr、Ni、Mo、V、W、T
i、Nbのいずれか一種以上を合計で1.5重量%以上
含むことを特徴とする。The second rolling composite roll of the present invention is
C: An outer layer material made of WC-based cemented carbide has a thickness of 1 mm on the outer circumference of the inner layer material made of an iron-based alloy containing 0.5% by weight or more.
A rolling composite roll, which is metal-bonded by interposing the following intermediate layer between an outer layer material and an inner layer material, and comprising JIS R16
In the bending test based on 01, the bending strength of the bending test piece including the boundary joint portion between the outer layer material and the inner layer material is 600 MPa.
The above is characterized. In addition, in these inventions, Cr, Ni, Mo, V, W and T are added to the inner layer material.
It is characterized by containing at least 1.5% by weight of one or more of i and Nb in total.
【0010】[0010]
【作用】超硬合金の外層材と鋼などの鉄系合金の内層材
を接合するとき、両者の炭素活量の差により、焼結接合
時に接合界面において炭素が拡散移動する。超硬合金の
炭素活量の方が高い場合には、接合界面付近の超硬合金
から炭素が内層材側に拡散するので、超硬合金内の炭素
が低下する。その結果、低炭素組成の炭化物であるη相
がこの部分に出現する。したがって、鋼の炭素活量が超
硬合金同等以上になれば超硬合金からの炭素の拡散がな
くなりη相の発生を防ぐことができる。When the outer layer material of the cemented carbide and the inner layer material of the iron-based alloy such as steel are joined, the carbon diffuses and moves at the joining interface during the sinter joining due to the difference in the carbon activities of the two. When the carbon activity of the cemented carbide is higher, carbon diffuses from the cemented carbide near the bonding interface to the inner layer material side, so that the carbon in the cemented carbide decreases. As a result, the η phase, which is a carbide having a low carbon composition, appears in this portion. Therefore, if the carbon activity of the steel is equal to or higher than that of the cemented carbide, the diffusion of carbon from the cemented carbide is eliminated and the generation of the η phase can be prevented.
【0011】発明者は、超硬合金と各種鉄系合金との接
合実験を行い、鉄系合金の炭素含有量が0.5重量%を
超えれば超硬合金からの炭素の拡散は殆どなく、η相の
発生を防止でき、十分な接合強度を持つ複合ロールが得
られることを確認した。つまり、鉄系合金の炭素含有量
が0.5重量%以上であれば、鉄系合金の炭素活量が超
硬合金のそれと同等以上になり、HIPによる接合を行
なっても、炭素の拡散が殆どなく、η相の発生を防止す
ることができるのである。したがって、このような内層
材を使用すれば、中間層の施工なしにη相のない健全な
接合界面を得ることができる。また、中間層の施工の容
易な刷毛塗りやスプレー塗布により、厚み1mm以下の
中間層を形成してもη相のない健全な接合界面を得るこ
とができる。The inventor conducted a joining experiment between cemented carbide and various iron-based alloys, and if the carbon content of the iron-based alloy exceeds 0.5% by weight, there is almost no diffusion of carbon from the cemented carbide, It was confirmed that the generation of the η phase can be prevented and a composite roll having sufficient bonding strength can be obtained. That is, when the carbon content of the iron-based alloy is 0.5% by weight or more, the carbon activity of the iron-based alloy becomes equal to or higher than that of the cemented carbide, and the carbon diffusion does not occur even when joining by HIP. Almost no η phase can be prevented from occurring. Therefore, if such an inner layer material is used, it is possible to obtain a sound joining interface without η phase without the construction of the intermediate layer. Also, by applying a brush or a spray coating, which makes it easy to apply the intermediate layer, it is possible to obtain a sound bonding interface without η phase even if the intermediate layer having a thickness of 1 mm or less is formed.
【0012】このような手段により、外層材と内層材と
の接合強度が十分な圧延用ロールを得ることができる。
本発明における接合強度は、外層材と内層材との境界接
合部を含む抗折試験片をロールから切り出し、JIS
R1601に準拠した抗折試験により測定した抗折強度
により評価する。一般的には、JIS R1601に準
拠した測定法で評価する。本発明の複合ロールは、この
評価法による抗折強度が600MPa以上であることが
好ましい。By such means, it is possible to obtain a rolling roll having a sufficient bonding strength between the outer layer material and the inner layer material.
The joining strength in the present invention is determined by cutting a bending test piece including a boundary joining portion between an outer layer material and an inner layer material from a roll, and measuring the JIS
It is evaluated by the bending strength measured by the bending test according to R1601. Generally, it is evaluated by a measuring method according to JIS R1601. The composite roll of the present invention preferably has a bending strength of 600 MPa or more as measured by this evaluation method.
【0013】さらに、内層材となる鉄系合金に、Cr、
Ni、Mo、V、W、Ti、Nbのいずれか一種以上を
合計で1.5重量%以上含むことが好ましい。このよう
な複合ロールの内層材には、より熱収縮の小さな超硬合
金の外層材に対し、内層材の大きな熱収縮により発生す
る歪みを緩和させる変態膨張特性が必要である。この変
態がパーライト変態では、変態後高温での塑性変形によ
る緩和により、常温への冷却過程での熱収縮差により、
大きな歪みが発生しロール破壊の原因となる。このた
め、このような変態は、ベイナイト変態あるいはマルテ
ンサイト変態のようにある程度低温で起こらなければな
らない。したがって、焼結後の冷却過程でベイナイト変
態あるいはマルテンサイト変態が起こるように、内層材
にはCr、Ni、Mo、V、W、Ti、Nbのいずれか
一種以上を合計で1.5重量%以上含むことが必要であ
る。Further, the iron-based alloy used as the inner layer material contains Cr,
It is preferable to contain at least 1.5% by weight in total of one or more of Ni, Mo, V, W, Ti and Nb. The inner layer material of such a composite roll is required to have transformation expansion characteristics for relaxing the strain generated by the large heat shrinkage of the inner layer material, as compared with the cemented carbide outer layer material having a smaller heat shrinkage. When this transformation is pearlite transformation, due to relaxation due to plastic deformation at high temperature after transformation, due to thermal shrinkage difference in the cooling process to normal temperature,
Large distortion occurs and causes roll breakage. For this reason, such transformation must occur at a certain low temperature, such as bainite transformation or martensite transformation. Therefore, in order to cause bainite transformation or martensite transformation in the cooling process after sintering, the inner layer material contains one or more of Cr, Ni, Mo, V, W, Ti and Nb in a total amount of 1.5% by weight. It is necessary to include the above.
【0014】[0014]
【発明の実施の形態】(実施例1)図1は圧延用複合ロ
ールを製造するのに用いるHIP法を説明する概略断面
図を示す。図1において、内径φ350mm、長さ90
0mmのHIP缶2の中央に、表1の本発明例1に示す
組成の鉄系合金からなる中空円筒状の内層材1を配置
し、内層材1の外面とHIP缶2の内面との間に形成さ
れた空隙に超硬合金の粉末3を充填した。超硬合金の粉
末3の組成は、重量比でWC80%、Co20%であ
る。本実施例では中間層の施工を行なわなかった。な
お、図1において右半分部分は対称なため省略してい
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIG. 1 is a schematic sectional view for explaining a HIP method used for producing a composite roll for rolling. 1, inner diameter φ350 mm, length 90
In the center of the 0 mm HIP can 2, a hollow cylindrical inner layer material 1 made of an iron-based alloy having the composition shown in Table 1 of the present invention is arranged, and between the outer surface of the inner layer material 1 and the inner surface of the HIP can 2. Cemented carbide powder 3 was filled in the voids formed in 1. The composition of the cemented carbide powder 3 is WC 80% and Co 20% by weight. In this example, the intermediate layer was not constructed. In FIG. 1, the right half part is omitted because it is symmetrical.
【0015】 表1 内層材の鉄系合金(重量%) C Si Mn Ni Cr Mo V 本発明例1 0.62 0.22 0.65 1.70 0.73 0.20 0.1 5 本発明例2 0.58 0.31 0.68 1.17 0.75 0.20 0.1 4 比較例11 0.37 0.20 0.63 1.68 0.81 0.20 0.1 5 比較例12 0.46 0.22 0.40 0.13 0.85 0.12 0.0 3[0015] Table 1 Iron-based alloy for inner layer material (% by weight) C Si Mn Ni Cr Mo V Invention Example 1 0.62 0.22 0.65 1.70 0.73 0.20 0.1 5 Invention Example 2 0.58 0.31 0.68 1.17 0.75 0.20 0.1 Four Comparative Example 11 0.37 0.20 0.63 1.68 0.81 0.20 0.1 5 Comparative Example 12 0.46 0.22 0.40 0.13 0.85 0.12 0.0 Three
【0016】HIP缶2を溶接密封し、真空ポンプで脱
気処理した後、HIP装置にて、1300℃、1000
気圧にてHIP処理を行なった。冷却後、HIP缶2を
機械加工により除去した。これにより得られた超硬合金
の外層材を有する本発明の複合ロールは、カラーチェッ
クにて、ロール端面に割れがないことを確認し、超音波
探傷装置により、外層材と内層材が健全に接合している
ことを確認した。また、ロール中央部から外層材と内層
材との境界接合部を含む抗折試験片を切り出し、JIS
R1601に準拠した抗折試験によりその抗折強度を
測定した結果、その抗折強度は1100MPaであっ
た。また、組織観察により境界接合部付近にはη相がな
いことを確認した。なお、内層材として中空円筒状のみ
ならず、中実の軸材を用いることもできる。The HIP can 2 is hermetically sealed by welding, degassed by a vacuum pump, and then heated at 1300 ° C. and 1000 by a HIP device.
HIP treatment was performed at atmospheric pressure. After cooling, the HIP can 2 was removed by machining. The composite roll of the present invention having the outer layer material of the cemented carbide obtained by this, color check, it is confirmed that there is no cracks on the end face of the roll, by the ultrasonic flaw detector, the outer layer material and the inner layer material sound It was confirmed that they were joined. In addition, a bending test piece including the boundary joint between the outer layer material and the inner layer material was cut out from the center of the roll, and the JIS
The bending strength was measured by a bending test according to R1601, and the bending strength was 1100 MPa. In addition, it was confirmed by structure observation that there was no η phase near the boundary joint. In addition, not only the hollow cylindrical shape but also a solid shaft material can be used as the inner layer material.
【0017】(実施例2)図2は圧延用複合ロールを製
造するのに用いるHIP法を説明する概略断面図を示
す。図2において、内径φ350mm、長さ900mm
のHIP缶2の中央に、表1の本発明例2に示す組成の
鉄系合金からなる中空円筒状の内層材1を配置した。そ
して、中間層4を形成するために、重量比でWC50
%、Co50%の混合粉末をスラリー状にしたものを、
内層材1の外表面に刷毛で厚みが0.2〜0.5mmにな
るよう塗布した。その後、内層材1の外面とHIP缶2
の内面との間に形成された空隙に超硬合金の粉末3を充
填した。超硬合金の粉末3の組成は、重量比でWC80
%、Co20%である。なお、図2において右半分部分
は対象なため省略している。(Embodiment 2) FIG. 2 is a schematic sectional view for explaining a HIP method used for manufacturing a composite roll for rolling. In Fig. 2, inner diameter φ350mm, length 900mm
In the center of the HIP can 2, a hollow cylindrical inner layer material 1 made of an iron-based alloy having the composition shown in Table 1 of the present invention was placed. Then, in order to form the intermediate layer 4, the weight ratio WC50
%, Co 50% mixed powder made into a slurry,
A brush was applied to the outer surface of the inner layer material 1 so as to have a thickness of 0.2 to 0.5 mm. Then, the outer surface of the inner layer material 1 and the HIP can 2
The cemented carbide powder 3 was filled in the void formed between the inner surface of the and. The composition of the cemented carbide powder 3 is WC80 in weight ratio.
% And Co 20%. In FIG. 2, the right half portion is omitted because it is not a target.
【0018】HIP缶2を溶接密封し、真空ポンプで脱
気処理した後、HIP装置にて、1300℃、1000
気圧にてHIP処理を施した。冷却後、HIP缶2を機
械加工により除去した。これにより得られた超硬合金の
外層材を有する本発明の複合ロールは、カラーチェック
および超音波探傷で検査したところ、外層材と内層材と
が中間層を挟んで健全に接合していることを確認した。
また、ロール中央部から外層材と内層材との境界接合部
を含む抗折試験片を切り出し、JIS R1601に準
拠した抗折試験によりその抗折強度を測定した結果、そ
の抗折強度は1100MPaであった。また、組織観察
により境界接合部付近にはη相がないことを確認した。The HIP can 2 is welded and hermetically sealed, degassed by a vacuum pump, and then heated at 1300 ° C. and 1000 by a HIP device.
HIP treatment was performed at atmospheric pressure. After cooling, the HIP can 2 was removed by machining. The composite roll of the present invention having the outer layer material of the cemented carbide obtained in this manner, when inspected by color check and ultrasonic flaw detection, the outer layer material and the inner layer material are soundly joined with the intermediate layer sandwiched therebetween. It was confirmed.
Further, a bending test piece including a boundary joint portion between the outer layer material and the inner layer material was cut out from the center part of the roll, and the bending strength was measured by a bending test according to JIS R1601, and the bending strength was 1100 MPa. there were. In addition, it was confirmed by structure observation that there was no η phase near the boundary joint.
【0019】(比較例1)表1の比較例11に示す組成
の中空円筒状の内層材を用いた以外は、実施例1と同様
の方法で超硬合金の外層材を有する複合ロールを製造し
た。結果、カラーチェックにて、ロール端面に割れがな
いことを確認し、超音波探傷装置により、外層材と内層
材が健全に接合していることを確認した。しかしなが
ら、ロール中央部から外層材と内層材との境界接合部を
含む抗折試験片を切り出し、JISR1601に準拠し
た抗折試験によりその抗折強度を測定した結果、その抗
折強度は450MPaであった。村上試薬エッチングに
よる組織観察を行なったところ、境界接合部付近の外層
材にη相が存在し、これが抗折強度劣化の原因であるこ
とが判った。(Comparative Example 1) A composite roll having an outer layer material of cemented carbide was produced in the same manner as in Example 1 except that the hollow cylindrical inner layer material having the composition shown in Comparative Example 11 in Table 1 was used. did. As a result, it was confirmed by color check that there was no crack on the end face of the roll, and it was confirmed by an ultrasonic flaw detector that the outer layer material and the inner layer material were properly joined. However, a bending test piece including a boundary joint portion between the outer layer material and the inner layer material was cut out from the center of the roll, and the bending strength was measured by a bending test according to JIS R1601. As a result, the bending strength was 450 MPa. It was When the structure was observed by Murakami reagent etching, it was found that the η phase was present in the outer layer material in the vicinity of the boundary joint, and this was the cause of the bending strength deterioration.
【0020】(比較例2)表1の比較例12に示す組成
の中空円筒状の内層材を用いた以外は、実施例1と同様
の方法で超硬合金の外層材を有する複合ロールを製造し
た。HIP缶を加工除去し、ロール端面のカラーチェッ
クを実施したところ、外層材と内層材の接合部に全周割
れが発生していた。また、超音波探傷で検査したとこ
ろ、ロール全面に割れが進展していることを確認した。(Comparative Example 2) A composite roll having an outer layer material of cemented carbide was produced in the same manner as in Example 1 except that the hollow cylindrical inner layer material having the composition shown in Comparative Example 12 in Table 1 was used. did. When the HIP can was processed and removed, and a color check was performed on the end surface of the roll, a circumferential crack was found at the joint between the outer layer material and the inner layer material. In addition, an inspection by ultrasonic flaw detection confirmed that cracks had developed on the entire surface of the roll.
【0021】[0021]
【発明の効果】本発明により、従来行なわれていた中間
層の施工の手間を省き、境界接合部に脆弱なη相がな
く、信頼性の高い境界接合部を有する超硬合金製圧延用
複合ロールを得ることができる。EFFECTS OF THE INVENTION According to the present invention, a composite for rolling made of cemented carbide having a highly reliable boundary joint without the need for a conventional intermediate layer construction and having a weak η phase at the boundary joint. You can get a roll.
【図1】圧延用複合ロールを製造するのに用いるHIP
法を説明する概略断面図を示す。FIG. 1 HIP used to manufacture a composite roll for rolling
The schematic sectional drawing explaining a method is shown.
【図2】圧延用複合ロールを製造するのに用いるHIP
法を説明する概略断面図を示す。FIG. 2 HIP used to manufacture a composite roll for rolling
The schematic sectional drawing explaining a method is shown.
1 内層材、 2 HIP缶、 3 超硬合金粉末、
4 中間層1 inner layer material, 2 HIP can, 3 cemented carbide powder,
4 Middle class
Claims (3)
らなる内層材の外周に、WC系超硬合金からなる外層材
が実質的に直接に金属接合された圧延用複合ロールであ
って、JIS R1601に準拠した抗折試験におい
て、外層材と内層材との境界接合部を含む抗折試験片の
抗折強度が600MPa以上であることを特徴とする圧
延用複合ロール。1. A rolling composite roll in which an outer layer material made of a WC-based cemented carbide is substantially directly metal-bonded to the outer periphery of an inner layer material made of an iron-based alloy containing C: 0.5% by weight or more. Then, in a bending test according to JIS R1601, a bending strength of a bending test piece including a boundary joint portion between an outer layer material and an inner layer material is 600 MPa or more, a rolling composite roll.
らなる内層材の外周に、WC系超硬合金からなる外層材
が、厚み1mm以下の中間層を外層材と内層材との間に
介在させて金属接合された圧延用複合ロールであって、
JIS R1601に準拠した抗折試験において、外層
材と内層材との境界接合部を含む抗折試験片の抗折強度
が600MPa以上であることを特徴とする圧延用複合
ロール。2. An outer layer material made of a WC-based cemented carbide and an intermediate layer having a thickness of 1 mm or less on the outer periphery of an inner layer material made of an iron-based alloy containing C: 0.5% by weight or more and an outer layer material and an inner layer material. A composite roll for rolling which is metal-bonded by being interposed between
In a bending test according to JIS R1601, a bending strength of a bending test piece including a boundary joint between an outer layer material and an inner layer material is 600 MPa or more, a rolling composite roll.
W、Ti、Nbのいずれか一種以上を合計で1.5重量
%以上含むことを特徴とする請求項1または2に記載の
圧延用複合ロール。3. The inner layer material comprises Cr, Ni, Mo, V,
The composite roll for rolling according to claim 1 or 2, which contains 1.5% by weight or more in total of one or more of W, Ti, and Nb.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002074608A JP3755758B2 (en) | 2002-03-18 | 2002-03-18 | Composite roll for rolling |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002074608A JP3755758B2 (en) | 2002-03-18 | 2002-03-18 | Composite roll for rolling |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2003275809A true JP2003275809A (en) | 2003-09-30 |
JP3755758B2 JP3755758B2 (en) | 2006-03-15 |
Family
ID=29203960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2002074608A Expired - Fee Related JP3755758B2 (en) | 2002-03-18 | 2002-03-18 | Composite roll for rolling |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3755758B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015053137A1 (en) * | 2013-10-09 | 2015-04-16 | 日立金属株式会社 | Superhard alloy composite roll and production method therefor |
JP2016068115A (en) * | 2014-09-30 | 2016-05-09 | 日立金属株式会社 | Composite sleeve roll made of hard metal |
JP2016188393A (en) * | 2015-03-30 | 2016-11-04 | 日立金属株式会社 | Cemented-carbide-made composite roll and method for manufacturing the same |
-
2002
- 2002-03-18 JP JP2002074608A patent/JP3755758B2/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015053137A1 (en) * | 2013-10-09 | 2015-04-16 | 日立金属株式会社 | Superhard alloy composite roll and production method therefor |
JPWO2015053137A1 (en) * | 2013-10-09 | 2017-03-09 | 日立金属株式会社 | Cemented carbide composite roll and manufacturing method thereof |
JP2016068115A (en) * | 2014-09-30 | 2016-05-09 | 日立金属株式会社 | Composite sleeve roll made of hard metal |
JP2016188393A (en) * | 2015-03-30 | 2016-11-04 | 日立金属株式会社 | Cemented-carbide-made composite roll and method for manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
JP3755758B2 (en) | 2006-03-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN111386158B (en) | Composite cemented carbide roll and method for manufacturing composite cemented carbide roll | |
JP4538794B2 (en) | Cemented carbide roll for rolling | |
JP4200479B2 (en) | Cemented carbide roll for rolling | |
JP2003275809A (en) | Composite roll for rolling | |
JPH06182409A (en) | Combined sleeve roll and its production | |
JP4735950B2 (en) | Cemented carbide roll for rolling | |
JP3891411B2 (en) | Cemented carbide roll for rolling | |
JP4392652B2 (en) | Composite roll for rolling made of cemented carbide and method for producing the same | |
JP4103072B2 (en) | Cemented carbide composite roll | |
JP2003342668A (en) | Composite roll made of cemented carbide | |
JP2001087805A (en) | Composite sleeve made of sintered hard alloy | |
JP4288633B2 (en) | Cemented carbide composite roll | |
JP6354504B2 (en) | Cemented carbide composite roll and manufacturing method thereof | |
JP2004167503A (en) | Composite rolling roll made of cemented carbide | |
JP4392653B2 (en) | Cemented carbide roll for rolling | |
JP2004167501A (en) | Composite roll made of cemented carbide | |
JPH02175014A (en) | Composite sintered hard alloy roll and its manufacture | |
JP4221703B2 (en) | Cemented carbide roll composite roll manufacturing method and roll | |
JP2002301506A (en) | Composite roll made of sintered hard alloy | |
KR20060015048A (en) | Cemented carbide composite rolls for strip rolling | |
JP4221696B2 (en) | Cemented carbide composite roll | |
JP4340989B2 (en) | Cemented carbide composite roll | |
JP2004243341A (en) | Composite roll for rolling made of cemented carbide | |
JP6421758B2 (en) | Cemented carbide composite roll and manufacturing method thereof | |
JP4320699B2 (en) | Composite roll for rolling |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050221 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20051124 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20051202 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20051215 |
|
R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 Ref document number: 3755758 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100106 Year of fee payment: 4 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110106 Year of fee payment: 5 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120106 Year of fee payment: 6 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130106 Year of fee payment: 7 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130106 Year of fee payment: 7 |
|
LAPS | Cancellation because of no payment of annual fees |